diff --git a/third_party/llvm-project/libcxx/.clang-format b/third_party/llvm-project/libcxx/.clang-format
index 77ffa23..acf987d 100644
--- a/third_party/llvm-project/libcxx/.clang-format
+++ b/third_party/llvm-project/libcxx/.clang-format
@@ -37,7 +37,6 @@
                   '_LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION',
                   '_LIBCPP_HIDE_FROM_ABI_AFTER_V1',
                   '_LIBCPP_INLINE_VISIBILITY',
-                  '_LIBCPP_CONSTEVAL',
                   '_LIBCPP_NOALIAS',
                   '_LIBCPP_USING_IF_EXISTS',
                   '_LIBCPP_DEPRECATED',
@@ -77,10 +76,6 @@
 PointerAlignment: Left
 
 
-# Disable formatting options which may break tests.
-SortIncludes: false
-ReflowComments: false
-
 # libc++'s preferred indentions of preprocessor statements.
 IndentPPDirectives: AfterHash
 
diff --git a/third_party/llvm-project/libcxx/.clang-tidy b/third_party/llvm-project/libcxx/.clang-tidy
index 4bc25c3..8f7cef9 100644
--- a/third_party/llvm-project/libcxx/.clang-tidy
+++ b/third_party/llvm-project/libcxx/.clang-tidy
@@ -46,6 +46,10 @@
     value: __
   - key:   readability-identifier-naming.PrivateMemberSuffix
     value: _
+  - key:   readability-identifier-naming.LocalVariableCase
+    value: lower_case
+  - key:   readability-identifier-naming.LocalVariablePrefix
+    value: __
 
 # TODO: investigate these checks
 # bugprone-branch-clone,
diff --git a/third_party/llvm-project/libcxx/BUILD.gn b/third_party/llvm-project/libcxx/BUILD.gn
index 0c80cac..d40ed65 100644
--- a/third_party/llvm-project/libcxx/BUILD.gn
+++ b/third_party/llvm-project/libcxx/BUILD.gn
@@ -16,7 +16,7 @@
   cflags = [ "-nostdinc" ]
 
   cflags_cc = [
-    "-std=c++17",
+    "-std=c++20",
     "-nostdinc++",
     "-fvisibility-inlines-hidden",
     "-fms-compatibility-version=19.00",
@@ -57,6 +57,7 @@
 }
 
 static_library("cxx") {
+
   sources = [
     "src/algorithm.cpp",
     "src/any.cpp",
@@ -88,6 +89,7 @@
     "src/valarray.cpp",
     "src/variant.cpp",
     "src/vector.cpp",
+    "src/verbose_abort.cpp",
 
     # src/atomic.cpp is omitted because this file breaks the build.
 
@@ -106,12 +108,11 @@
     # src/random_shuffle.cpp are unneeded. These require replacing C++20's
     # "constinit" with "_LIBCPP_CONSTINIT".
 
-    # src/barrier.cpp, src/debug.cpp, src/legacy_pointer_safety.cpp, and
-    # src/verbose_abort.cpp are unneeded.
+    # src/barrier.cpp, src/debug.cpp, src/legacy_pointer_safety.cpp are unneeded.
   ]
 
   configs += [ ":cxx_config" ]
-
+  configs -= ["//starboard/build/config:default_cpp_standard"]
   deps = [
     "//starboard:starboard_headers_only",
     "//starboard/common",
diff --git a/third_party/llvm-project/libcxx/CMakeLists.txt b/third_party/llvm-project/libcxx/CMakeLists.txt
index f3b2c10..cf572af 100644
--- a/third_party/llvm-project/libcxx/CMakeLists.txt
+++ b/third_party/llvm-project/libcxx/CMakeLists.txt
@@ -12,6 +12,7 @@
 list(INSERT CMAKE_MODULE_PATH 0
   "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../runtimes/cmake/Modules"
   "${LLVM_COMMON_CMAKE_UTILS}"
   "${LLVM_COMMON_CMAKE_UTILS}/Modules"
   )
@@ -23,6 +24,7 @@
 set(LIBCXX_BINARY_INCLUDE_DIR "${LIBCXX_BINARY_DIR}/include/c++build")
 
 include(GNUInstallDirs)
+include(WarningFlags)
 
 # Require out of source build.
 include(MacroEnsureOutOfSourceBuild)
@@ -464,7 +466,7 @@
 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "AIX")
-  add_target_flags_if_supported("-mdefault-visibility-export-mapping=explicit")
+  add_flags_if_supported("-mdefault-visibility-export-mapping=explicit")
   set(CMAKE_AIX_EXPORT_ALL_SYMBOLS OFF)
 endif()
 
@@ -538,15 +540,15 @@
     target_add_compile_flags_if_supported(${target} PRIVATE -fvisibility=hidden)
   endif()
 
-  if (LIBCXX_CONFIGURE_IDE)
-    # This simply allows IDE to process <experimental/coroutine>
-    target_add_compile_flags_if_supported(${target} PRIVATE -fcoroutines-ts)
-  endif()
-
   # Let the library headers know they are currently being used to build the
   # library.
   target_compile_definitions(${target} PRIVATE -D_LIBCPP_BUILDING_LIBRARY)
 
+  # Make sure the library can be build without transitive includes. This makes
+  # it easier to upgrade the library to a newer language standard without build
+  # errors.
+  target_compile_definitions(${target} PRIVATE -D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES)
+
   if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
     target_compile_definitions(${target} PRIVATE -D_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS)
   endif()
@@ -562,65 +564,6 @@
   target_compile_options(${target} PUBLIC "${LIBCXX_ADDITIONAL_COMPILE_FLAGS}")
 endfunction()
 
-# Warning flags ===============================================================
-function(cxx_add_warning_flags target)
-  target_compile_definitions(${target} PUBLIC -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-  if (MSVC)
-    # -W4 is the cl.exe/clang-cl equivalent of -Wall. (In cl.exe and clang-cl,
-    # -Wall is equivalent to -Weverything in GCC style compiler drivers.)
-    target_add_compile_flags_if_supported(${target} PRIVATE -W4)
-  else()
-    target_add_compile_flags_if_supported(${target} PRIVATE -Wall)
-  endif()
-  target_add_compile_flags_if_supported(${target} PRIVATE -Wextra -W -Wwrite-strings
-                                                          -Wno-unused-parameter -Wno-long-long
-                                                          -Werror=return-type -Wextra-semi -Wundef
-                                                          -Wformat-nonliteral)
-  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-    target_add_compile_flags_if_supported(${target} PRIVATE
-      -Wno-user-defined-literals
-      -Wno-covered-switch-default
-      -Wno-suggest-override
-    )
-    if (LIBCXX_TARGETING_CLANG_CL)
-      target_add_compile_flags_if_supported(${target} PRIVATE
-        -Wno-c++98-compat
-        -Wno-c++98-compat-pedantic
-        -Wno-c++11-compat
-        -Wno-undef
-        -Wno-reserved-id-macro
-        -Wno-gnu-include-next
-        -Wno-gcc-compat # For ignoring "'diagnose_if' is a clang extension" warnings
-        -Wno-zero-as-null-pointer-constant # FIXME: Remove this and fix all occurrences.
-        -Wno-deprecated-dynamic-exception-spec # For auto_ptr
-        -Wno-sign-conversion
-        -Wno-old-style-cast
-        -Wno-deprecated # FIXME: Remove this and fix all occurrences.
-        -Wno-shift-sign-overflow # FIXME: Why do we need this with clang-cl but not clang?
-        -Wno-double-promotion # FIXME: remove me
-      )
-    endif()
-  elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
-    target_add_compile_flags_if_supported(${target} PRIVATE
-      -Wno-attributes
-      -Wno-literal-suffix
-      -Wno-c++14-compat
-      -Wno-noexcept-type
-      -Wno-suggest-override)
-  endif()
-  if (LIBCXX_ENABLE_WERROR)
-    target_add_compile_flags_if_supported(${target} PRIVATE -Werror)
-    target_add_compile_flags_if_supported(${target} PRIVATE -WX)
-  else()
-    # TODO(EricWF) Remove this. We shouldn't be suppressing errors when -Werror is
-    # added elsewhere.
-    target_add_compile_flags_if_supported(${target} PRIVATE -Wno-error)
-  endif()
-  if (LIBCXX_ENABLE_PEDANTIC)
-    target_add_compile_flags_if_supported(${target} PRIVATE -pedantic)
-  endif()
-endfunction()
-
 # Exception flags =============================================================
 function(cxx_add_exception_flags target)
   if (LIBCXX_ENABLE_EXCEPTIONS)
@@ -903,7 +846,7 @@
 # Setup all common build flags =================================================
 function(cxx_add_common_build_flags target)
   cxx_add_basic_build_flags(${target})
-  cxx_add_warning_flags(${target})
+  cxx_add_warning_flags(${target} ${LIBCXX_ENABLE_WERROR} ${LIBCXX_ENABLE_PEDANTIC})
   cxx_add_windows_flags(${target})
   cxx_add_exception_flags(${target})
   cxx_add_rtti_flags(${target})
diff --git a/third_party/llvm-project/libcxx/METADATA b/third_party/llvm-project/libcxx/METADATA
index b067d6c..88b9508 100644
--- a/third_party/llvm-project/libcxx/METADATA
+++ b/third_party/llvm-project/libcxx/METADATA
@@ -1,21 +1,26 @@
 name: "libcxx"
 description:
-  "Filtered subtree at third_party/llvm-project/libcxx."
+  "Subdirectory subtree of llvm-project."
 
 third_party {
   identifier {
     type: "ChromiumVersion"
-    value: "111.0.5563.150"  # from https://chromereleases.googleblog.com/2023/03/stable-channel-update-for-chromeos_29.html
+    value: "114.0.5735.351"
   }
   identifier {
     type: "Git"
-    value: "https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git"
-    version: "1127c78cf90cf253be614a1e1d3645da57edbeb4"
-    # from https://chromium.googlesource.com/chromium/src/+/111.0.5563.150/DEPS#486
+    value: "https://chromium.googlesource.com/external/github.com/llvm/llvm-project"
+    version: "27f27d15f6c90b026eca23b8ee238fdbf772fd80"
+    # from https://chromium.googlesource.com/chromium/src/+/refs/tags/114.0.5735.351/tools/clang/scripts/update.py#38
+    closest_version: "llvmorg-17-init-8029-g27f27d15"
+  }
+  identifier {
+    type: "UpstreamSubdir"
+    value: "libcxx"
   }
   last_upgrade_date {
-    year: 2023
-    month: 1
-    day: 17
+    year: 2024
+    month: 2
+    day: 21
   }
 }
diff --git a/third_party/llvm-project/libcxx/benchmarks/CMakeLists.txt b/third_party/llvm-project/libcxx/benchmarks/CMakeLists.txt
index 7eb76ac..bf7c4b4 100644
--- a/third_party/llvm-project/libcxx/benchmarks/CMakeLists.txt
+++ b/third_party/llvm-project/libcxx/benchmarks/CMakeLists.txt
@@ -107,7 +107,7 @@
 add_library(           cxx-benchmarks-flags-libcxx INTERFACE)
 target_link_libraries( cxx-benchmarks-flags-libcxx INTERFACE cxx-benchmarks-flags)
 target_compile_options(cxx-benchmarks-flags-libcxx INTERFACE ${SANITIZER_FLAGS} -Wno-user-defined-literals -Wno-suggest-override)
-target_link_options(   cxx-benchmarks-flags-libcxx INTERFACE -nodefaultlibs "-L${BENCHMARK_LIBCXX_INSTALL}/lib" ${SANITIZER_FLAGS})
+target_link_options(   cxx-benchmarks-flags-libcxx INTERFACE -nodefaultlibs "-L${BENCHMARK_LIBCXX_INSTALL}/lib" "-L${BENCHMARK_LIBCXX_INSTALL}/lib64" ${SANITIZER_FLAGS})
 
 set(libcxx_benchmark_targets)
 
@@ -158,9 +158,11 @@
 #==============================================================================
 set(BENCHMARK_TESTS
     algorithms.partition_point.bench.cpp
+    algorithms/equal.bench.cpp
     algorithms/lower_bound.bench.cpp
     algorithms/make_heap.bench.cpp
     algorithms/make_heap_then_sort_heap.bench.cpp
+    algorithms/min.bench.cpp
     algorithms/min_max_element.bench.cpp
     algorithms/pop_heap.bench.cpp
     algorithms/push_heap.bench.cpp
@@ -174,6 +176,7 @@
     algorithms/sort.bench.cpp
     algorithms/sort_heap.bench.cpp
     algorithms/stable_sort.bench.cpp
+    libcxxabi/dynamic_cast.bench.cpp
     allocation.bench.cpp
     deque.bench.cpp
     deque_iterator.bench.cpp
@@ -186,6 +189,7 @@
     formatter_int.bench.cpp
     function.bench.cpp
     join_view.bench.cpp
+    lexicographical_compare_three_way.bench.cpp
     map.bench.cpp
     monotonic_buffer.bench.cpp
     ordered_set.bench.cpp
diff --git a/third_party/llvm-project/libcxx/benchmarks/algorithms/equal.bench.cpp b/third_party/llvm-project/libcxx/benchmarks/algorithms/equal.bench.cpp
new file mode 100644
index 0000000..6d63d8c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/benchmarks/algorithms/equal.bench.cpp
@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <algorithm>
+#include <benchmark/benchmark.h>
+#include <vector>
+
+static void bm_equal_iter(benchmark::State& state) {
+  std::vector<char> vec1(state.range(), '1');
+  std::vector<char> vec2(state.range(), '1');
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(vec1);
+    benchmark::DoNotOptimize(vec2);
+    benchmark::DoNotOptimize(std::equal(vec1.begin(), vec1.end(), vec2.begin()));
+  }
+}
+BENCHMARK(bm_equal_iter)->DenseRange(1, 8)->Range(16, 1 << 20);
+
+static void bm_equal(benchmark::State& state) {
+  std::vector<char> vec1(state.range(), '1');
+  std::vector<char> vec2(state.range(), '1');
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(vec1);
+    benchmark::DoNotOptimize(vec2);
+    benchmark::DoNotOptimize(std::equal(vec1.begin(), vec1.end(), vec2.begin(), vec2.end()));
+  }
+}
+BENCHMARK(bm_equal)->DenseRange(1, 8)->Range(16, 1 << 20);
+
+static void bm_ranges_equal(benchmark::State& state) {
+  std::vector<char> vec1(state.range(), '1');
+  std::vector<char> vec2(state.range(), '1');
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(vec1);
+    benchmark::DoNotOptimize(vec2);
+    benchmark::DoNotOptimize(std::ranges::equal(vec1, vec2));
+  }
+}
+BENCHMARK(bm_ranges_equal)->DenseRange(1, 8)->Range(16, 1 << 20);
+
+BENCHMARK_MAIN();
diff --git a/third_party/llvm-project/libcxx/benchmarks/algorithms/min.bench.cpp b/third_party/llvm-project/libcxx/benchmarks/algorithms/min.bench.cpp
new file mode 100644
index 0000000..1e1dd4e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/benchmarks/algorithms/min.bench.cpp
@@ -0,0 +1,70 @@
+#include <algorithm>
+#include <cassert>
+
+#include <benchmark/benchmark.h>
+
+void run_sizes(auto benchmark) {
+  benchmark->Arg(1)
+      ->Arg(2)
+      ->Arg(3)
+      ->Arg(4)
+      ->Arg(5)
+      ->Arg(6)
+      ->Arg(7)
+      ->Arg(8)
+      ->Arg(9)
+      ->Arg(10)
+      ->Arg(11)
+      ->Arg(12)
+      ->Arg(13)
+      ->Arg(14)
+      ->Arg(15)
+      ->Arg(16)
+      ->Arg(17)
+      ->Arg(18)
+      ->Arg(19)
+      ->Arg(20)
+      ->Arg(21)
+      ->Arg(22)
+      ->Arg(23)
+      ->Arg(24)
+      ->Arg(25)
+      ->Arg(26)
+      ->Arg(27)
+      ->Arg(28)
+      ->Arg(29)
+      ->Arg(30)
+      ->Arg(31)
+      ->Arg(32)
+      ->Arg(64)
+      ->Arg(512)
+      ->Arg(1024)
+      ->Arg(4000)
+      ->Arg(4096)
+      ->Arg(5500)
+      ->Arg(64000)
+      ->Arg(65536)
+      ->Arg(70000);
+}
+
+template <class T>
+static void BM_std_min(benchmark::State& state) {
+  std::vector<T> vec(state.range(), 3);
+
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(vec);
+    benchmark::DoNotOptimize(std::ranges::min(vec));
+  }
+}
+BENCHMARK(BM_std_min<char>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<short>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<int>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<long long>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<__int128>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<unsigned char>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<unsigned short>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<unsigned int>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<unsigned long long>)->Apply(run_sizes);
+BENCHMARK(BM_std_min<unsigned __int128>)->Apply(run_sizes);
+
+BENCHMARK_MAIN();
diff --git a/third_party/llvm-project/libcxx/benchmarks/lexicographical_compare_three_way.bench.cpp b/third_party/llvm-project/libcxx/benchmarks/lexicographical_compare_three_way.bench.cpp
new file mode 100644
index 0000000..e58134a
--- /dev/null
+++ b/third_party/llvm-project/libcxx/benchmarks/lexicographical_compare_three_way.bench.cpp
@@ -0,0 +1,96 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <algorithm>
+
+#include "benchmark/benchmark.h"
+#include "test_iterators.h"
+
+static void BM_lexicographical_compare_three_way_slow_path(benchmark::State& state) {
+  auto size = state.range(0);
+  std::vector<int> v1;
+  v1.resize(size);
+  // v2 is identical except for the last value.
+  // This means, that `lexicographical_compare_three_way` actually has to
+  // compare the complete vector and cannot bail out early.
+  std::vector<int> v2 = v1;
+  v2.back() += 1;
+  int* b1 = v1.data();
+  int* e1 = b1 + v1.size();
+  int* b2 = v2.data();
+  int* e2 = b2 + v2.size();
+
+  for (auto _ : state) {
+    auto cmp = std::compare_three_way();
+    benchmark::DoNotOptimize(std::__lexicographical_compare_three_way_slow_path(b1, e1, b2, e2, cmp));
+  }
+}
+
+BENCHMARK(BM_lexicographical_compare_three_way_slow_path)->RangeMultiplier(4)->Range(1, 1 << 20);
+
+static void BM_lexicographical_compare_three_way_fast_path(benchmark::State& state) {
+  auto size = state.range(0);
+  std::vector<int> v1;
+  v1.resize(size);
+  // v2 is identical except for the last value.
+  // This means, that `lexicographical_compare_three_way` actually has to
+  // compare the complete vector and cannot bail out early.
+  std::vector<int> v2 = v1;
+  v2.back() += 1;
+  int* b1 = v1.data();
+  int* e1 = b1 + v1.size();
+  int* b2 = v2.data();
+  int* e2 = b2 + v2.size();
+
+  for (auto _ : state) {
+    auto cmp = std::compare_three_way();
+    benchmark::DoNotOptimize(std::__lexicographical_compare_three_way_fast_path(b1, e1, b2, e2, cmp));
+  }
+}
+
+BENCHMARK(BM_lexicographical_compare_three_way_fast_path)->RangeMultiplier(4)->Range(1, 1 << 20);
+
+template <class IteratorT>
+static void BM_lexicographical_compare_three_way(benchmark::State& state) {
+  auto size = state.range(0);
+  std::vector<int> v1;
+  v1.resize(size);
+  // v2 is identical except for the last value.
+  // This means, that `lexicographical_compare_three_way` actually has to
+  // compare the complete vector and cannot bail out early.
+  std::vector<int> v2 = v1;
+  v2.back() += 1;
+  auto b1 = IteratorT{v1.data()};
+  auto e1 = IteratorT{v1.data() + v1.size()};
+  auto b2 = IteratorT{v2.data()};
+  auto e2 = IteratorT{v2.data() + v2.size()};
+
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(std::lexicographical_compare_three_way(b1, e1, b2, e2));
+  }
+}
+
+// Type alias to make sure the `*` does not appear in the benchmark name.
+// A `*` would confuse the Python test runner running this google benchmark.
+using IntPtr = int*;
+
+// `lexicographical_compare_three_way` has a fast path for random access iterators.
+BENCHMARK_TEMPLATE(BM_lexicographical_compare_three_way, IntPtr)->RangeMultiplier(4)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_lexicographical_compare_three_way, random_access_iterator<IntPtr>)
+    ->RangeMultiplier(4)
+    ->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_lexicographical_compare_three_way, cpp17_input_iterator<IntPtr>)
+    ->RangeMultiplier(4)
+    ->Range(1, 1 << 20);
+
+int main(int argc, char** argv) {
+  benchmark::Initialize(&argc, argv);
+  if (benchmark::ReportUnrecognizedArguments(argc, argv))
+    return 1;
+
+  benchmark::RunSpecifiedBenchmarks();
+}
diff --git a/third_party/llvm-project/libcxx/benchmarks/libcxxabi/dynamic_cast.bench.cpp b/third_party/llvm-project/libcxx/benchmarks/libcxxabi/dynamic_cast.bench.cpp
new file mode 100644
index 0000000..439eea8
--- /dev/null
+++ b/third_party/llvm-project/libcxx/benchmarks/libcxxabi/dynamic_cast.bench.cpp
@@ -0,0 +1,172 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <cstddef>
+
+#include "benchmark/benchmark.h"
+
+template <std::size_t Depth>
+struct Chain : Chain<Depth - 1> {};
+
+template <>
+struct Chain<0> {
+  virtual ~Chain() noexcept = default;
+};
+
+template <std::size_t Index, std::size_t Depth>
+struct Dag : Dag<Index, Depth - 1>, Dag<Index + 1, Depth - 1> {};
+
+template <std::size_t Index>
+struct Dag<Index, 0> {
+  virtual ~Dag() noexcept = default;
+};
+
+template <std::size_t Depth>
+struct VChain : virtual VChain<Depth - 1> {};
+
+template <>
+struct VChain<0> {
+  virtual ~VChain() noexcept = default;
+};
+
+template <std::size_t Index, std::size_t Depth>
+struct VDag : virtual VDag<Index, Depth - 1>, virtual VDag<Index + 1, Depth - 1> {};
+
+template <std::size_t Index>
+struct VDag<Index, 0> {
+  virtual ~VDag() noexcept = default;
+};
+
+template <typename Dyn, typename From, typename To = Dyn>
+static void DynCast(benchmark::State& state) {
+  Dyn obj;
+  From* from_ptr = &obj;
+  for (auto _ : state) {
+    To* to_ptr = dynamic_cast<To*>(from_ptr);
+    benchmark::DoNotOptimize(to_ptr);
+  }
+}
+
+static void StaticCast(benchmark::State& state) {
+  Chain<9> obj;
+  Chain<0>* from_ptr = &obj;
+  for (auto _ : state) {
+    Chain<9>* to_ptr = static_cast<Chain<9>*>(from_ptr);
+    benchmark::DoNotOptimize(to_ptr);
+  }
+}
+
+// Downcast along a chain from base to the most derived type
+BENCHMARK(DynCast<Chain<1>, Chain<0>>)->Name("Chain, 1 level");
+BENCHMARK(DynCast<Chain<2>, Chain<0>>)->Name("Chain, 2 levels");
+BENCHMARK(DynCast<Chain<3>, Chain<0>>)->Name("Chain, 3 levels");
+BENCHMARK(DynCast<Chain<4>, Chain<0>>)->Name("Chain, 4 levels");
+BENCHMARK(DynCast<Chain<5>, Chain<0>>)->Name("Chain, 5 levels");
+BENCHMARK(DynCast<Chain<6>, Chain<0>>)->Name("Chain, 6 levels");
+BENCHMARK(DynCast<Chain<7>, Chain<0>>)->Name("Chain, 7 levels");
+BENCHMARK(DynCast<Chain<8>, Chain<0>>)->Name("Chain, 8 levels");
+BENCHMARK(DynCast<Chain<9>, Chain<0>>)->Name("Chain, 9 levels");
+
+// Downcast along a chain from base to the middle of the chain
+BENCHMARK(DynCast<Chain<2>, Chain<0>, Chain<1>>)->Name("Chain middle, 1 level");
+BENCHMARK(DynCast<Chain<4>, Chain<0>, Chain<2>>)->Name("Chain middle, 2 levels");
+BENCHMARK(DynCast<Chain<6>, Chain<0>, Chain<3>>)->Name("Chain middle, 3 levels");
+BENCHMARK(DynCast<Chain<8>, Chain<0>, Chain<4>>)->Name("Chain middle, 4 levels");
+
+// Downcast along a chain that fails
+BENCHMARK(DynCast<Chain<1>, Chain<0>, Chain<9>>)->Name("Chain fail, 1 level");
+BENCHMARK(DynCast<Chain<2>, Chain<0>, Chain<9>>)->Name("Chain fail, 2 levels");
+BENCHMARK(DynCast<Chain<3>, Chain<0>, Chain<9>>)->Name("Chain fail, 3 levels");
+BENCHMARK(DynCast<Chain<4>, Chain<0>, Chain<9>>)->Name("Chain fail, 4 levels");
+BENCHMARK(DynCast<Chain<5>, Chain<0>, Chain<9>>)->Name("Chain fail, 5 levels");
+BENCHMARK(DynCast<Chain<6>, Chain<0>, Chain<9>>)->Name("Chain fail, 6 levels");
+BENCHMARK(DynCast<Chain<7>, Chain<0>, Chain<9>>)->Name("Chain fail, 7 levels");
+BENCHMARK(DynCast<Chain<8>, Chain<0>, Chain<9>>)->Name("Chain fail, 8 levels");
+
+// Downcast along a virtual inheritance chain from base to the most derived type
+BENCHMARK(DynCast<VChain<1>, VChain<0>>)->Name("VChain, 1 level");
+BENCHMARK(DynCast<VChain<2>, VChain<0>>)->Name("VChain, 2 levels");
+BENCHMARK(DynCast<VChain<3>, VChain<0>>)->Name("VChain, 3 levels");
+BENCHMARK(DynCast<VChain<4>, VChain<0>>)->Name("VChain, 4 levels");
+BENCHMARK(DynCast<VChain<5>, VChain<0>>)->Name("VChain, 5 levels");
+
+// Downcast along a virtual inheritance chain from base to the middle of the chain
+BENCHMARK(DynCast<VChain<2>, VChain<0>, VChain<1>>)->Name("VChain middle, 1 level");
+BENCHMARK(DynCast<VChain<4>, VChain<0>, VChain<2>>)->Name("VChain middle, 2 levels");
+BENCHMARK(DynCast<VChain<6>, VChain<0>, VChain<3>>)->Name("VChain middle, 3 levels");
+BENCHMARK(DynCast<VChain<8>, VChain<0>, VChain<4>>)->Name("VChain middle, 4 levels");
+
+// Downcast along a virtual chain that fails
+BENCHMARK(DynCast<VChain<1>, VChain<0>, VChain<8>>)->Name("VChain fail, 1 level");
+BENCHMARK(DynCast<VChain<2>, VChain<0>, VChain<8>>)->Name("VChain fail, 2 levels");
+BENCHMARK(DynCast<VChain<3>, VChain<0>, VChain<8>>)->Name("VChain fail, 3 levels");
+BENCHMARK(DynCast<VChain<4>, VChain<0>, VChain<8>>)->Name("VChain fail, 4 levels");
+BENCHMARK(DynCast<VChain<5>, VChain<0>, VChain<8>>)->Name("VChain fail, 5 levels");
+
+// Downcast along a DAG from base to the most derived type
+BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>>)->Name("DAG rightmost, 3 levels");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>>)->Name("DAG rightmost, 4 levels");
+BENCHMARK(DynCast<Dag<0, 5>, Dag<5, 0>>)->Name("DAG rightmost, 5 levels");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<0, 0>>)->Name("DAG leftmost, 3 levels");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>>)->Name("DAG leftmost, 4 levels");
+BENCHMARK(DynCast<Dag<0, 5>, Dag<0, 0>>)->Name("DAG leftmost, 5 levels");
+
+// Downcast along a DAG from base to the middle of the DAG
+BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<3, 1>>)->Name("DAG rightmost middle, 1 level");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<2, 2>>)->Name("DAG rightmost middle, 2 levels");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<1, 3>>)->Name("DAG rightmost middle, 3 levels");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 1>>)->Name("DAG leftmost middle, 1 level");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 2>>)->Name("DAG leftmost middle, 2 levels");
+BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 3>>)->Name("DAG leftmost middle, 3 levels");
+
+// Sidecast along a DAG
+BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, Dag<0, 0>>)->Name("DAG sidecast, 3 levels");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<2, 1>, Dag<0, 1>>)->Name("DAG sidecast, 2 levels");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<1, 2>, Dag<0, 2>>)->Name("DAG sidecast, 1 level");
+
+// Sidecast along a DAG that fails
+BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, Dag<0, 4>>)->Name("DAG sidecast fail, 3 levels");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<2, 1>, Dag<0, 4>>)->Name("DAG sidecast fail, 2 levels");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<1, 2>, Dag<0, 4>>)->Name("DAG sidecast fail, 1 level");
+
+// Downcast along a virtual inheritance DAG from base to the most derived type
+BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>>)->Name("VDAG rightmost, 3 levels");
+BENCHMARK(DynCast<VDag<0, 4>, VDag<4, 0>>)->Name("VDAG rightmost, 4 levels");
+BENCHMARK(DynCast<VDag<0, 5>, VDag<5, 0>>)->Name("VDAG rightmost, 5 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<0, 0>>)->Name("VDAG leftmost, 3 levels");
+BENCHMARK(DynCast<VDag<0, 4>, VDag<0, 0>>)->Name("VDAG leftmost, 4 levels");
+BENCHMARK(DynCast<VDag<0, 5>, VDag<0, 0>>)->Name("VDAG leftmost, 5 levels");
+
+// Downcast along a virtual inheritance DAG from base to the middle of the DAG
+BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<2, 1>>)->Name("VDAG rightmost middle, 1 level");
+BENCHMARK(DynCast<VDag<0, 4>, VDag<4, 0>, VDag<2, 2>>)->Name("VDAG rightmost middle, 2 levels");
+BENCHMARK(DynCast<VDag<0, 5>, VDag<5, 0>, VDag<2, 3>>)->Name("VDAG rightmost middle, 3 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<0, 0>, VDag<0, 1>>)->Name("VDAG leftmost middle, 1 level");
+BENCHMARK(DynCast<VDag<0, 4>, VDag<0, 0>, VDag<0, 2>>)->Name("VDAG leftmost middle, 2 levels");
+BENCHMARK(DynCast<VDag<0, 5>, VDag<0, 0>, VDag<0, 3>>)->Name("VDAG leftmost middle, 3 levels");
+
+// Sidecast along a virtual inheritance DAG
+BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<0, 0>>)->Name("VDAG sidecast, 3 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<2, 1>, VDag<0, 1>>)->Name("VDAG sidecast, 2 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<1, 2>, VDag<0, 2>>)->Name("VDAG sidecast, 1 level");
+
+// Sidecast along a virtual inheritance DAG that fails
+BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<0, 4>>)->Name("VDAG sidecast fail, 3 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<2, 1>, VDag<0, 4>>)->Name("VDAG sidecast fail, 2 levels");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<1, 2>, VDag<0, 4>>)->Name("VDAG sidecast fail, 1 level");
+
+// Cast to complete object pointer
+BENCHMARK(DynCast<Chain<8>, Chain<0>, void>)->Name("Chain to complete");
+BENCHMARK(DynCast<VChain<5>, VChain<0>, void>)->Name("VChain to complete");
+BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, void>)->Name("DAG to complete");
+BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, void>)->Name("VDAG to complete");
+
+// Static cast as the baseline.
+BENCHMARK(StaticCast)->Name("Static");
+
+BENCHMARK_MAIN();
diff --git a/third_party/llvm-project/libcxx/cmake/Modules/HandleLibcxxFlags.cmake b/third_party/llvm-project/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
index 7251254..ffd859e 100644
--- a/third_party/llvm-project/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
+++ b/third_party/llvm-project/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
@@ -5,133 +5,10 @@
 # - LIBCXX_LIBRARIES: libraries to link libc++ to.
 
 include(CheckCXXCompilerFlag)
+include(HandleFlags)
 
 unset(add_flag_if_supported)
 
-# Mangle the name of a compiler flag into a valid CMake identifier.
-# Ex: --std=c++11 -> STD_EQ_CXX11
-macro(mangle_name str output)
-  string(STRIP "${str}" strippedStr)
-  string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}")
-  string(REGEX REPLACE "^-+" "" strippedStr "${strippedStr}")
-  string(REGEX REPLACE "-+$" "" strippedStr "${strippedStr}")
-  string(REPLACE "-" "_" strippedStr "${strippedStr}")
-  string(REPLACE ":" "_COLON_" strippedStr "${strippedStr}")
-  string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}")
-  string(REPLACE "+" "X" strippedStr "${strippedStr}")
-  string(TOUPPER "${strippedStr}" ${output})
-endmacro()
-
-# Remove a list of flags from all CMake variables that affect compile flags.
-# This can be used to remove unwanted flags specified on the command line
-# or added in other parts of LLVM's cmake configuration.
-macro(remove_flags)
-  foreach(var ${ARGN})
-    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
-    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
-    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
-    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
-    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-    string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
-    string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
-    string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
-    string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}")
-    remove_definitions(${var})
-  endforeach()
-endmacro(remove_flags)
-
-macro(check_flag_supported flag)
-    mangle_name("${flag}" flagname)
-    check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-endmacro()
-
-macro(append_flags DEST)
-  foreach(value ${ARGN})
-    list(APPEND ${DEST} ${value})
-    list(APPEND ${DEST} ${value})
-  endforeach()
-endmacro()
-
-# If the specified 'condition' is true then append the specified list of flags to DEST
-macro(append_flags_if condition DEST)
-  if (${condition})
-    list(APPEND ${DEST} ${ARGN})
-  endif()
-endmacro()
-
-# Add each flag in the list specified by DEST if that flag is supported by the current compiler.
-macro(append_flags_if_supported DEST)
-  foreach(flag ${ARGN})
-    mangle_name("${flag}" flagname)
-    check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-    append_flags_if(CXX_SUPPORTS_${flagname}_FLAG ${DEST} ${flag})
-  endforeach()
-endmacro()
-
-# Add a macro definition if condition is true.
-macro(define_if condition def)
-  if (${condition})
-    add_definitions(${def})
-  endif()
-endmacro()
-
-# Add a macro definition if condition is not true.
-macro(define_if_not condition def)
-  if (NOT ${condition})
-    add_definitions(${def})
-  endif()
-endmacro()
-
-# Add a macro definition to the __config_site file if the specified condition
-# is 'true'. Note that '-D${def}' is not added. Instead it is expected that
-# the build include the '__config_site' header.
-macro(config_define_if condition def)
-  if (${condition})
-    set(${def} ON)
-  endif()
-endmacro()
-
-macro(config_define_if_not condition def)
-  if (NOT ${condition})
-    set(${def} ON)
-  endif()
-endmacro()
-
-macro(config_define value def)
-  set(${def} ${value})
-endmacro()
-
-# Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS',
-# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
-macro(add_target_flags)
-  foreach(value ${ARGN})
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${value}")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${value}")
-    list(APPEND LIBCXX_COMPILE_FLAGS ${value})
-    list(APPEND LIBCXX_LINK_FLAGS ${value})
-  endforeach()
-endmacro()
-
-# If the specified 'condition' is true then add a list of flags to
-# all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXX_COMPILE_FLAGS'
-# and 'LIBCXX_LINK_FLAGS'.
-macro(add_target_flags_if condition)
-  if (${condition})
-    add_target_flags(${ARGN})
-  endif()
-endmacro()
-
-# Add all the flags supported by the compiler to all of
-# 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXX_COMPILE_FLAGS'
-# and 'LIBCXX_LINK_FLAGS'.
-macro(add_target_flags_if_supported)
-  foreach(flag ${ARGN})
-    mangle_name("${flag}" flagname)
-    check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-    add_target_flags_if(CXX_SUPPORTS_${flagname}_FLAG ${flag})
-  endforeach()
-endmacro()
-
 # Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and
 # 'LIBCXX_LINK_FLAGS'.
 macro(add_flags)
@@ -159,31 +36,6 @@
   endforeach()
 endmacro()
 
-# Add a list of flags to 'LIBCXX_COMPILE_FLAGS'.
-macro(add_compile_flags)
-  foreach(f ${ARGN})
-    list(APPEND LIBCXX_COMPILE_FLAGS ${f})
-  endforeach()
-endmacro()
-
-# If 'condition' is true then add the specified list of flags to
-# 'LIBCXX_COMPILE_FLAGS'
-macro(add_compile_flags_if condition)
-  if (${condition})
-    add_compile_flags(${ARGN})
-  endif()
-endmacro()
-
-# For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the
-# flag is supported by the C++ compiler.
-macro(add_compile_flags_if_supported)
-  foreach(flag ${ARGN})
-      mangle_name("${flag}" flagname)
-      check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-      add_compile_flags_if(CXX_SUPPORTS_${flagname}_FLAG ${flag})
-  endforeach()
-endmacro()
-
 # Add a list of flags to 'LIBCXX_LINK_FLAGS'.
 macro(add_link_flags)
   foreach(f ${ARGN})
@@ -191,24 +43,6 @@
   endforeach()
 endmacro()
 
-# If 'condition' is true then add the specified list of flags to
-# 'LIBCXX_LINK_FLAGS'
-macro(add_link_flags_if condition)
-  if (${condition})
-    add_link_flags(${ARGN})
-  endif()
-endmacro()
-
-# For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the
-# flag is supported by the C++ compiler.
-macro(add_link_flags_if_supported)
-  foreach(flag ${ARGN})
-    mangle_name("${flag}" flagname)
-    check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-    add_link_flags_if(CXX_SUPPORTS_${flagname}_FLAG ${flag})
-  endforeach()
-endmacro()
-
 # Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'.
 macro(add_library_flags)
   foreach(lib ${ARGN})
@@ -224,11 +58,6 @@
   endif()
 endmacro()
 
-# Turn a comma separated CMake list into a space separated string.
-macro(split_list listname)
-  string(REPLACE ";" " " ${listname} "${${listname}}")
-endmacro()
-
 # For each specified flag, add that link flag to the provided target.
 # The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
 function(target_add_link_flags_if_supported target visibility)
@@ -240,15 +69,3 @@
     endif()
   endforeach()
 endfunction()
-
-# For each specified flag, add that compile flag to the provided target.
-# The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
-function(target_add_compile_flags_if_supported target visibility)
-  foreach(flag ${ARGN})
-    mangle_name("${flag}" flagname)
-    check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG")
-    if (CXX_SUPPORTS_${flagname}_FLAG)
-      target_compile_options(${target} ${visibility} ${flag})
-    endif()
-  endforeach()
-endfunction()
diff --git a/third_party/llvm-project/libcxx/cmake/caches/Apple.cmake b/third_party/llvm-project/libcxx/cmake/caches/Apple.cmake
index 5224e04..c9ee3b0 100644
--- a/third_party/llvm-project/libcxx/cmake/caches/Apple.cmake
+++ b/third_party/llvm-project/libcxx/cmake/caches/Apple.cmake
@@ -17,5 +17,3 @@
 
 set(LIBCXX_TEST_CONFIG "apple-libc++-shared.cfg.in" CACHE STRING "")
 set(LIBCXXABI_TEST_CONFIG "apple-libc++abi-shared.cfg.in" CACHE STRING "")
-set(LIBCXX_TEST_PARAMS "stdlib=apple-libc++" CACHE STRING "")
-set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/third_party/llvm-project/libcxx/cmake/caches/Generic-modules-lsv.cmake b/third_party/llvm-project/libcxx/cmake/caches/Generic-modules-lsv.cmake
new file mode 100644
index 0000000..b44424f
--- /dev/null
+++ b/third_party/llvm-project/libcxx/cmake/caches/Generic-modules-lsv.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "enable_modules=True;enable_modules_lsv=True" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/third_party/llvm-project/libcxx/docs/AddingNewCIJobs.rst b/third_party/llvm-project/libcxx/docs/AddingNewCIJobs.rst
index f9428f8..9d749c0 100644
--- a/third_party/llvm-project/libcxx/docs/AddingNewCIJobs.rst
+++ b/third_party/llvm-project/libcxx/docs/AddingNewCIJobs.rst
@@ -37,7 +37,7 @@
       [...]
 
 If you create your own agents, put them in the ``libcxx-builders`` queue and
-use agent tags to allow targetting your agents from the Buildkite pipeline
+use agent tags to allow targeting your agents from the Buildkite pipeline
 config appropriately.
 
 We try to keep the pipeline definition file as simple as possible, and to
diff --git a/third_party/llvm-project/libcxx/docs/Contributing.rst b/third_party/llvm-project/libcxx/docs/Contributing.rst
index 186ac66..8c0b3a1 100644
--- a/third_party/llvm-project/libcxx/docs/Contributing.rst
+++ b/third_party/llvm-project/libcxx/docs/Contributing.rst
@@ -31,7 +31,7 @@
 Before committing or creating a review, please go through this check-list to make
 sure you don't forget anything:
 
-- Do you have tests for every public class and/or function you're adding or modifying?
+- Do you have :ref:`tests <testing>` for every public class and/or function you're adding or modifying?
 - Did you update the synopsis of the relevant headers?
 - Did you update the relevant files to track implementation status (in ``docs/Status/``)?
 - Did you mark all functions and type declarations with the :ref:`proper visibility macro <visibility-macros>`?
diff --git a/third_party/llvm-project/libcxx/docs/FeatureTestMacroTable.rst b/third_party/llvm-project/libcxx/docs/FeatureTestMacroTable.rst
index b46fc8c..677a719 100644
--- a/third_party/llvm-project/libcxx/docs/FeatureTestMacroTable.rst
+++ b/third_party/llvm-project/libcxx/docs/FeatureTestMacroTable.rst
@@ -260,6 +260,8 @@
     ------------------------------------------------- -----------------
     ``__cpp_lib_math_constants``                      ``201907L``
     ------------------------------------------------- -----------------
+    ``__cpp_lib_move_iterator_concept``               ``202207L``
+    ------------------------------------------------- -----------------
     ``__cpp_lib_polymorphic_allocator``               ``201902L``
     ------------------------------------------------- -----------------
     ``__cpp_lib_ranges``                              ``202106L``
@@ -316,13 +318,17 @@
     ------------------------------------------------- -----------------
     ``__cpp_lib_constexpr_memory``                    ``202202L``
     ------------------------------------------------- -----------------
-    ``__cpp_lib_constexpr_typeinfo``                  *unimplemented*
+    ``__cpp_lib_constexpr_typeinfo``                  ``202106L``
     ------------------------------------------------- -----------------
     ``__cpp_lib_expected``                            ``202202L``
     ------------------------------------------------- -----------------
+    ``__cpp_lib_format_ranges``                       ``202207L``
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_formatters``                          *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_forward_like``                        ``202207L``
     ------------------------------------------------- -----------------
-    ``__cpp_lib_invoke_r``                            *unimplemented*
+    ``__cpp_lib_invoke_r``                            ``202106L``
     ------------------------------------------------- -----------------
     ``__cpp_lib_is_scoped_enum``                      ``202011L``
     ------------------------------------------------- -----------------
@@ -332,6 +338,8 @@
     ------------------------------------------------- -----------------
     ``__cpp_lib_out_ptr``                             *unimplemented*
     ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_as_rvalue``                    ``202207L``
+    ------------------------------------------------- -----------------
     ``__cpp_lib_ranges_chunk``                        *unimplemented*
     ------------------------------------------------- -----------------
     ``__cpp_lib_ranges_chunk_by``                     *unimplemented*
diff --git a/third_party/llvm-project/libcxx/docs/ReleaseNotes.rst b/third_party/llvm-project/libcxx/docs/ReleaseNotes.rst
index 88a4859..100c3b4 100644
--- a/third_party/llvm-project/libcxx/docs/ReleaseNotes.rst
+++ b/third_party/llvm-project/libcxx/docs/ReleaseNotes.rst
@@ -37,13 +37,53 @@
 
 Implemented Papers
 ------------------
+- P2520R0 - ``move_iterator<T*>`` should be a random access iterator
+- P1328R1 - ``constexpr type_info::operator==()``
+- P1413R3 - Formatting ``thread::id`` (the ``stacktrace`` is not done yet)
 
 Improvements and New Features
 -----------------------------
+- ``std::equal`` and ``std::ranges::equal`` are now forwarding to ``std::memcmp`` for integral types and pointers,
+  which can lead up to 40x performance improvements.
+
+- ``std::string_view`` now provides iterators that check for out-of-bounds accesses when the safe
+  libc++ mode is enabled.
+
+- The performance of ``dynamic_cast`` on its hot paths is greatly improved and is as efficient as the
+  ``libsupc++`` implementation. Note that the performance improvements are shipped in ``libcxxabi``.
 
 Deprecations and Removals
 -------------------------
 
+- The ``<experimental/coroutine>`` header has been removed in this release. The ``<coroutine>`` header
+  has been shipping since LLVM 14, so the Coroutines TS implementation is being removed per our policy
+  for removing TSes.
+
+- Several incidental transitive includes have been removed from libc++. Those
+  includes are removed based on the language version used. Incidental transitive
+  inclusions of the following headers have been removed:
+
+  - C++2b: ``atomic``, ``bit``, ``cstdint``, ``cstdlib``, ``cstring``, ``initializer_list``, ``limits``, ``new``,
+           ``stdexcept``, ``system_error``, ``type_traits``, ``typeinfo``
+
+- The headers ``<experimental/algorithm>`` and ``<experimental/functional>`` have been removed, since all the contents
+  have been implemented in namespace ``std`` for at least two releases.
+
+- The formatter specialization ``template<size_t N> struct formatter<const charT[N], charT>``
+  has been removed. Since libc++'s format library was marked experimental there
+  is no backwards compatibility option. This specialization has been removed
+  from the Standard since it was never used, the proper specialization to use
+  instead is ``template<size_t N> struct formatter<charT[N], charT>``.
+
+- Libc++ used to provide some C++11 tag type global variables in C++03 as an extension, which are removed in
+  this release. Those variables were ``std::allocator_arg``, ``std::defer_lock``, ``std::try_to_lock``,
+  ``std::adopt_lock``, and ``std::piecewise_construct``. Note that the types associated to those variables are
+  still provided in C++03 as an extension (e.g. ``std::piecewise_construct_t``). Providing those variables in
+  C++03 mode made it impossible to define them properly -- C++11 mandated that they be ``constexpr`` variables,
+  which is impossible in C++03 mode. Furthermore, C++17 mandated that they be ``inline constexpr`` variables,
+  which led to ODR violations when mixed with the C++03 definition. Cleaning this up is required for libc++ to
+  make progress on support for C++20 modules.
+
 Upcoming Deprecations and Removals
 ----------------------------------
 
@@ -51,6 +91,12 @@
   Please see the updated documentation about the safe libc++ mode and in particular the ``_LIBCPP_VERBOSE_ABORT``
   macro for details.
 
+- The headers ``<experimental/deque>``, ``<experimental/forward_list>``, ``<experimental/list>``,
+  ``<experimental/map>``, ``<experimental/memory_resource>``, ``<experimental/regex>``, ``<experimental/set>``,
+  ``<experimental/string>``, ``<experimental/unordered_map>``, ``<experimental/unordered_set>``,
+  and ``<experimental/vector>`` will be removed in LLVM 18, as all their contents will have been implemented in
+  namespace ``std`` for at least two releases.
+
 API Changes
 -----------
 
@@ -59,3 +105,7 @@
 
 Build System Changes
 --------------------
+
+- Building libc++ and libc++abi for Apple platforms now requires targeting macOS 10.13 and later.
+  This is relevant for vendors building the libc++ shared library and for folks statically linking
+  libc++ into an application that has back-deployment requirements on Apple platforms.
diff --git a/third_party/llvm-project/libcxx/docs/Status/Cxx20Issues.csv b/third_party/llvm-project/libcxx/docs/Status/Cxx20Issues.csv
index db05461..c014393 100644
--- a/third_party/llvm-project/libcxx/docs/Status/Cxx20Issues.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/Cxx20Issues.csv
@@ -1,6 +1,6 @@
 "Issue #","Issue Name","Meeting","Status","First released version","Labels"
 "`2070 <https://wg21.link/LWG2070>`__","``allocate_shared``\  should use ``allocator_traits<A>::construct``\ ","Toronto","Resolved by `P0674R1 <https://wg21.link/P0674R1>`__",""
-"`2444 <https://wg21.link/LWG2444>`__","Inconsistent complexity for ``std::sort_heap``\ ","Toronto","",""
+"`2444 <https://wg21.link/LWG2444>`__","Inconsistent complexity for ``std::sort_heap``\ ","Toronto","|Nothing To Do|",""
 "`2593 <https://wg21.link/LWG2593>`__","Moved-from state of Allocators","Toronto","",""
 "`2597 <https://wg21.link/LWG2597>`__","``std::log``\  misspecified for complex numbers","Toronto","",""
 "`2783 <https://wg21.link/LWG2783>`__","``stack::emplace()``\  and ``queue::emplace()``\  should return ``decltype(auto)``\ ","Toronto","|Complete|",""
@@ -76,7 +76,7 @@
 "`3075 <https://wg21.link/LWG3075>`__","``basic_string``\  needs deduction guides from ``basic_string_view``\ ","Jacksonville","|Complete|",""
 "","","","","",""
 "`2139 <https://wg21.link/LWG2139>`__","What is a user-defined type?","Rapperswil","",""
-"`2970 <https://wg21.link/LWG2970>`__","Return type of std::visit misspecified","Rapperswil","",""
+"`2970 <https://wg21.link/LWG2970>`__","Return type of std::visit misspecified","Rapperswil","|Complete|","11.0"
 "`3058 <https://wg21.link/LWG3058>`__","Parallel adjacent_difference shouldn't require creating temporaries","Rapperswil","",""
 "`3062 <https://wg21.link/LWG3062>`__","Unnecessary decay_t in is_execution_policy_v should be remove_cvref_t","Rapperswil","",""
 "`3067 <https://wg21.link/LWG3067>`__","recursive_directory_iterator::pop must invalidate","Rapperswil","|Nothing To Do|",""
@@ -103,7 +103,7 @@
 "`2960 <https://wg21.link/LWG2960>`__","[fund.ts.v3] ``nonesuch``\  is insufficiently useless","San Diego","|Complete|",""
 "`2995 <https://wg21.link/LWG2995>`__","``basic_stringbuf``\  default constructor forbids it from using SSO capacity","San Diego","",""
 "`2996 <https://wg21.link/LWG2996>`__","Missing rvalue overloads for ``shared_ptr``\  operations","San Diego","",""
-"`3008 <https://wg21.link/LWG3008>`__","``make_shared``\  (sub)object destruction semantics are not specified","San Diego","",""
+"`3008 <https://wg21.link/LWG3008>`__","``make_shared``\  (sub)object destruction semantics are not specified","San Diego","|Complete|","16.0"
 "`3022 <https://wg21.link/LWG3022>`__","``is_convertible<derived*, base*>``\  may lead to ODR","San Diego","Resolved by 1285R0",""
 "`3025 <https://wg21.link/LWG3025>`__","Map-like container deduction guides should use ``pair<Key, T>``\ , not ``pair<const Key, T>``\ ","San Diego","|Complete|",""
 "`3031 <https://wg21.link/LWG3031>`__","Algorithms and predicates with non-const reference arguments","San Diego","",""
@@ -183,7 +183,7 @@
 "`3266 <https://wg21.link/LWG3266>`__","``to_chars(bool)``\  should be deleted","Belfast","|Complete|","14.0"
 "`3272 <https://wg21.link/LWG3272>`__","``%I%p``\  should parse/format ``duration``\  since midnight","Belfast","","","|chrono| |format|"
 "`3259 <https://wg21.link/LWG3259>`__","The definition of *constexpr iterators* should be adjusted","Belfast","|Nothing To Do|",""
-"`3103 <https://wg21.link/LWG3103>`__","Errors in taking subview of ``span``\  should be ill-formed where possible","Belfast","",""
+"`3103 <https://wg21.link/LWG3103>`__","Errors in taking subview of ``span``\  should be ill-formed where possible","Belfast","11.0","|Complete|"
 "`3274 <https://wg21.link/LWG3274>`__","Missing feature test macro for ``<span>``\ ","Belfast","|Complete|","11.0"
 "`3276 <https://wg21.link/LWG3276>`__","Class ``split_view::outer_iterator::value_type``\  should inherit from ``view_interface``\ ","Belfast","|Complete|","15.0","|ranges|"
 "`3277 <https://wg21.link/LWG3277>`__","Pre-increment on prvalues is not a requirement of ``weakly_incrementable``\ ","Belfast","|Nothing To Do|","","|ranges|"
@@ -262,13 +262,13 @@
 "`3347 <https://wg21.link/LWG3347>`__","``std::pair<T, U>``\  now requires ``T``\  and ``U``\  to be less-than-comparable","Prague","",""
 "`3348 <https://wg21.link/LWG3348>`__","``__cpp_lib_unwrap_ref``\  in wrong header","Prague","|Complete|","12.0"
 "`3349 <https://wg21.link/LWG3349>`__","Missing ``__cpp_lib_constexpr_complex``\  for P0415R1","Prague","|Complete|","16.0"
-"`3350 <https://wg21.link/LWG3350>`__","Simplify return type of ``lexicographical_compare_three_way``\ ","Prague","","","|spaceship|"
+"`3350 <https://wg21.link/LWG3350>`__","Simplify return type of ``lexicographical_compare_three_way``\ ","Prague","|Complete|","17.0","|spaceship|"
 "`3351 <https://wg21.link/LWG3351>`__","``ranges::enable_safe_range``\  should not be constrained","Prague","|Complete|","15.0","|ranges|"
 "`3352 <https://wg21.link/LWG3352>`__","``strong_equality``\  isn't a thing","Prague","|Nothing To Do|","","|spaceship|"
 "`3354 <https://wg21.link/LWG3354>`__","``has_strong_structural_equality``\  has a meaningless definition","Prague","|Nothing To Do|","","|spaceship|"
 "`3355 <https://wg21.link/LWG3355>`__","The memory algorithms should support move-only input iterators introduced by P1207","Prague","|Complete|","15.0","|ranges|"
 "`3356 <https://wg21.link/LWG3356>`__","``__cpp_lib_nothrow_convertible``\  should be ``__cpp_lib_is_nothrow_convertible``\ ","Prague","|Complete|","12.0"
-"`3358 <https://wg21.link/LWG3358>`__","|sect|\ [span.cons] is mistaken that ``to_address``\  can throw","Prague","",""
+"`3358 <https://wg21.link/LWG3358>`__","|sect|\ [span.cons] is mistaken that ``to_address``\  can throw","Prague","|Complete|","17.0"
 "`3359 <https://wg21.link/LWG3359>`__","``<chrono>``\  leap second support should allow for negative leap seconds","Prague","","","|chrono|"
 "`3360 <https://wg21.link/LWG3360>`__","``three_way_comparable_with``\  is inconsistent with similar concepts","Prague","|Nothing To Do|","","|spaceship|"
 "`3362 <https://wg21.link/LWG3362>`__","Strike ``stop_source``\ 's ``operator!=``\ ","Prague","",""
diff --git a/third_party/llvm-project/libcxx/docs/Status/Cxx2b.rst b/third_party/llvm-project/libcxx/docs/Status/Cxx2b.rst
index e79ed28..df915d8 100644
--- a/third_party/llvm-project/libcxx/docs/Status/Cxx2b.rst
+++ b/third_party/llvm-project/libcxx/docs/Status/Cxx2b.rst
@@ -42,6 +42,11 @@
    .. [#note-P0533R9] P0533R9: ``isfinite``, ``isinf``, ``isnan`` and ``isnormal`` are implemented.
    .. [#note-P1413R3] P1413R3: ``std::aligned_storage_t`` and ``std::aligned_union_t`` are marked deprecated, but
       clang doesn't issue a diagnostic for deprecated using template declarations.
+   .. [#note-P2520R0] P2520R0: Libc++ implemented this paper as a DR in C++20 as well.
+   .. [#note-P2711R1] P2711R1: ``join_with_view`` hasn't been done yet since this type isn't implemented yet.
+   .. [#note-P2693R1] P1413R3: The formatter for ``std::thread::id`` is implemented.
+      The formatter for ``stacktrace`` is not implemented, since ``stacktrace`` is
+      not implemented yet.
 
 .. _issues-status-cxx2b:
 
@@ -52,3 +57,8 @@
    :file: Cxx2bIssues.csv
    :header-rows: 1
    :widths: auto
+
+.. note::
+
+   .. [#note-LWG3750] LWG3750 Only ``__cpp_lib_format_ranges`` is fully implemented.
+   .. [#note-LWG3798] LWG3798: ``join_with_view``, ``zip_transform_view``, and ``adjacent_transform_view`` haven't been done yet since these types aren't implemented yet.
diff --git a/third_party/llvm-project/libcxx/docs/Status/Cxx2bIssues.csv b/third_party/llvm-project/libcxx/docs/Status/Cxx2bIssues.csv
index b2cc710..8fa96fe 100644
--- a/third_party/llvm-project/libcxx/docs/Status/Cxx2bIssues.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/Cxx2bIssues.csv
@@ -63,7 +63,7 @@
 `2774 <https://wg21.link/LWG2774>`__,"``std::function`` construction vs assignment","June 2021","",""
 `2818 <https://wg21.link/LWG2818>`__,"``::std::`` everywhere rule needs tweaking","June 2021","|Nothing To Do|",""
 `2997 <https://wg21.link/LWG2997>`__,"LWG 491 and the specification of ``{forward_,}list::unique``","June 2021","",""
-`3410 <https://wg21.link/LWG3410>`__,"``lexicographical_compare_three_way`` is overspecified","June 2021","","","|spaceship|"
+`3410 <https://wg21.link/LWG3410>`__,"``lexicographical_compare_three_way`` is overspecified","June 2021","|Complete|","17.0","|spaceship|"
 `3430 <https://wg21.link/LWG3430>`__,"``std::fstream`` & co. should be constructible from string_view","June 2021","",""
 `3462 <https://wg21.link/LWG3462>`__,"§[formatter.requirements]: Formatter requirements forbid use of ``fc.arg()``","June 2021","","","|format|"
 `3481 <https://wg21.link/LWG3481>`__,"``viewable_range`` mishandles lvalue move-only views","June 2021","Superseded by `P2415R2 <https://wg21.link/P2415R2>`__","","|ranges|"
@@ -155,7 +155,7 @@
 "`3649 <https://wg21.link/LWG3649>`__","[fund.ts.v2] Reinstate and bump ``__cpp_lib_experimental_memory_resource`` feature test macro","February 2022","",""
 "`3650 <https://wg21.link/LWG3650>`__","Are ``std::basic_string`` 's ``iterator`` and ``const_iterator`` constexpr iterators?","February 2022","|Nothing to do|",""
 "`3654 <https://wg21.link/LWG3654>`__","``basic_format_context::arg(size_t)`` should be ``noexcept`` ","February 2022","|Complete|","15.0","|format|"
-"`3657 <https://wg21.link/LWG3657>`__","``std::hash<std::filesystem::path>`` is not enabled","February 2022","",""
+"`3657 <https://wg21.link/LWG3657>`__","``std::hash<std::filesystem::path>`` is not enabled","February 2022","|Complete|","17.0"
 "`3660 <https://wg21.link/LWG3660>`__","``iterator_traits<common_iterator>::pointer`` should conform to §[iterator.traits]","February 2022","|Complete|","14.0","|ranges|"
 "`3661 <https://wg21.link/LWG3661>`__","``constinit atomic<shared_ptr<T>> a(nullptr);`` should work","February 2022","",""
 "","","","","",""
@@ -208,17 +208,17 @@
 "`3745 <https://wg21.link/LWG3745>`__","``std::atomic_wait`` and its friends lack ``noexcept``", "November 2022","|Complete|","16.0",""
 "`3746 <https://wg21.link/LWG3746>`__","``optional``'s spaceship with ``U`` with a type derived from optional causes infinite constraint meta-recursion", "November 2022","","","|spaceship|"
 "`3747 <https://wg21.link/LWG3747>`__","``ranges::uninitialized_copy_n``, ``ranges::uninitialized_move_n``, and ``ranges::destroy_n`` should use ``std::move``", "November 2022","","","|ranges|"
-"`3750 <https://wg21.link/LWG3750>`__","Too many papers bump ``__cpp_lib_format``", "November 2022","","","|format|"
+"`3750 <https://wg21.link/LWG3750>`__","Too many papers bump ``__cpp_lib_format``", "November 2022","|Partial| [#note-LWG3750]_","","|format|"
 "`3751 <https://wg21.link/LWG3751>`__","Missing feature macro for ``flat_set``", "November 2022","","","|flat_containers|"
 "`3753 <https://wg21.link/LWG3753>`__","Clarify entity vs. freestanding entity", "November 2022","","",""
-"`3754 <https://wg21.link/LWG3754>`__","Class template expected synopsis contains declarations that do not match the detailed description", "November 2022","","",""
-"`3755 <https://wg21.link/LWG3755>`__","``tuple-for-each`` can call ``user-defined`` ``operator,``", "November 2022","","",""
+"`3754 <https://wg21.link/LWG3754>`__","Class template expected synopsis contains declarations that do not match the detailed description", "November 2022","|Nothing to do|","",""
+"`3755 <https://wg21.link/LWG3755>`__","``tuple-for-each`` can call ``user-defined`` ``operator,``", "November 2022","|Complete|","17.0",""
 "`3757 <https://wg21.link/LWG3757>`__","What's the effect of ``std::forward_like<void>(x)``?", "November 2022","","",""
 "`3759 <https://wg21.link/LWG3759>`__","``ranges::rotate_copy`` should use ``std::move``", "November 2022","","","|ranges|"
 "`3760 <https://wg21.link/LWG3760>`__","``cartesian_product_view::iterator``'s ``parent_`` is never valid", "November 2022","","","|ranges|"
 "`3761 <https://wg21.link/LWG3761>`__","``cartesian_product_view::iterator::operator-`` should pass by reference", "November 2022","","","|ranges|"
 "`3762 <https://wg21.link/LWG3762>`__","``generator::iterator::operator==`` should pass by reference", "November 2022","","",""
-"`3764 <https://wg21.link/LWG3764>`__","``reference_wrapper::operator()`` should propagate noexcept", "November 2022","","",""
+"`3764 <https://wg21.link/LWG3764>`__","``reference_wrapper::operator()`` should propagate noexcept", "November 2022","17.0","|Complete|",""
 "`3765 <https://wg21.link/LWG3765>`__","``const_sentinel`` should be constrained", "November 2022","","","|ranges|"
 "`3766 <https://wg21.link/LWG3766>`__","``view_interface::cbegin`` is underconstrained", "November 2022","","","|ranges|"
 "`3770 <https://wg21.link/LWG3770>`__","``const_sentinel_t`` is missing", "November 2022","","","|ranges|"
@@ -226,15 +226,15 @@
 "`3774 <https://wg21.link/LWG3774>`__","``<flat_set>`` should include ``<compare>``", "November 2022","","","|flat_containers|"
 "`3775 <https://wg21.link/LWG3775>`__","Broken dependencies in the ``Cpp17Allocator`` requirements", "November 2022","","",""
 "`3778 <https://wg21.link/LWG3778>`__","``vector<bool>`` missing exception specifications", "November 2022","","",""
-"`3781 <https://wg21.link/LWG3781>`__","The exposition-only alias templates ``cont-key-type`` and ``cont-mapped-type`` should be removed", "November 2022","","",""
-"`3782 <https://wg21.link/LWG3782>`__","Should ``<math.h>`` declare ``::lerp``?", "November 2022","","",""
+"`3781 <https://wg21.link/LWG3781>`__","The exposition-only alias templates ``cont-key-type`` and ``cont-mapped-type`` should be removed", "November 2022","|Nothing to do|","",""
+"`3782 <https://wg21.link/LWG3782>`__","Should ``<math.h>`` declare ``::lerp``?", "November 2022","|Complete|","17.0",""
 "`3784 <https://wg21.link/LWG3784>`__","std.compat should not provide ``::byte`` and its friends", "November 2022","","",""
 "`3785 <https://wg21.link/LWG3785>`__","``ranges::to`` is over-constrained on the destination type being a range", "November 2022","","","|ranges|"
 "`3788 <https://wg21.link/LWG3788>`__","``jthread::operator=(jthread&&)`` postconditions are unimplementable under self-assignment", "November 2022","","",""
 "`3792 <https://wg21.link/LWG3792>`__","``__cpp_lib_constexpr_algorithms`` should also be defined in ``<utility>``", "November 2022","|Complete|","16.0",""
 "`3795 <https://wg21.link/LWG3795>`__","Self-move-assignment of ``std::future`` and ``std::shared_future`` have unimplementable postconditions", "November 2022","","",""
 "`3796 <https://wg21.link/LWG3796>`__","``movable-box`` as member should use ``default-initialization`` instead of ``copy-initialization``", "November 2022","","","|ranges|"
-"`3798 <https://wg21.link/LWG3798>`__","Rvalue reference and ``iterator_category``", "November 2022","","",""
+"`3798 <https://wg21.link/LWG3798>`__","Rvalue reference and ``iterator_category``", "November 2022","|Partial| [#note-LWG3798]_","","|ranges|"
 "`3801 <https://wg21.link/LWG3801>`__","``cartesian_product_view::iterator::distance-from`` ignores the size of last underlying range", "November 2022","","","|ranges|"
 "`3814 <https://wg21.link/LWG3814>`__","Add freestanding items requested by NB comments", "November 2022","","",""
 "`3816 <https://wg21.link/LWG3816>`__","``flat_map`` and ``flat_multimap`` should impose sequence container requirements", "November 2022","","","|flat_containers|"
@@ -245,6 +245,67 @@
 "`3824 <https://wg21.link/LWG3824>`__","Number of ``bind`` placeholders is underspecified", "November 2022","|Nothing to do|","",""
 "`3826 <https://wg21.link/LWG3826>`__","Redundant specification [for overload of yield_value]", "November 2022","","",""
 "","","","","",""
-"`3631 <https://wg21.link/LWG3631>`__","``basic_format_arg(T&&)`` should use ``remove_cvref_t<T>`` throughout","Not voted in","|Complete|","15.0",""
-"`3645 <https://wg21.link/LWG3645>`__","``resize_and_overwrite`` is overspecified to call its callback with lvalues","Not voted in","|Complete|","14.0",""
+"`2195 <https://wg21.link/LWG2195>`__","Missing constructors for ``match_results``","February 2023","","",""
+"`2295 <https://wg21.link/LWG2295>`__","Locale name when the provided ``Facet`` is a ``nullptr``","February 2023","","",""
+"`3032 <https://wg21.link/LWG3032>`__","``ValueSwappable`` requirement missing for ``push_heap`` and ``make_heap``","February 2023","","",""
+"`3085 <https://wg21.link/LWG3085>`__","``char_traits::copy`` precondition too weak","February 2023","","",""
+"`3664 <https://wg21.link/LWG3664>`__","`LWG 3392 <https://wg21.link/LWG3392>`__ ``broke std::ranges::distance(a, a+3)``","February 2023","","","|ranges|"
+"`3720 <https://wg21.link/LWG3720>`__","Restrict the valid types of ``arg-id`` for width and precision in ``std-format-spec``","February 2023","|Complete|","17.0","|format|"
+"`3756 <https://wg21.link/LWG3756>`__","Is the ``std::atomic_flag`` class signal-safe?","February 2023","","",""
+"`3769 <https://wg21.link/LWG3769>`__","``basic_const_iterator::operator==`` causes infinite constraint recursion","February 2023","","","|spaceship|"
+"`3807 <https://wg21.link/LWG3807>`__","The feature test macro for ``ranges::find_last`` should be renamed","February 2023","","","|ranges|"
+"`3811 <https://wg21.link/LWG3811>`__","``views::as_const`` on ``ref_view<T>`` should return ``ref_view<const T>``","February 2023","","","|ranges|"
+"`3820 <https://wg21.link/LWG3820>`__","``cartesian_product_view::iterator::prev`` is not quite right","February 2023","","","|ranges|"
+"`3825 <https://wg21.link/LWG3825>`__","Missing compile-time argument ``id`` check in ``basic_format_parse_context::next_arg_id``","February 2023","|Complete|","17.0","|format|"
+"`3204 <https://wg21.link/LWG3204>`__","``sub_match::swap`` only swaps the base class","February 2023","|Complete|","17.0",""
+"`3733 <https://wg21.link/LWG3733>`__","``ranges::to`` misuses ``cpp17-input-iterator``","February 2023","","","|ranges|"
+"`3742 <https://wg21.link/LWG3742>`__","``deque::prepend_range`` needs to permute","February 2023","","","|ranges|"
+"`3790 <https://wg21.link/LWG3790>`__","`P1467 <https://wg21.link/P1467>`__ accidentally changed ``nexttoward``'s signature","February 2023","","",""
+"`3819 <https://wg21.link/LWG3819>`__","``reference_meows_from_temporary`` should not use ``is_meowible``","February 2023","","",""
+"`3821 <https://wg21.link/LWG3821>`__","``uses_allocator_construction_args`` should have overload for ``pair-like``","February 2023","","",""
+"`3834 <https://wg21.link/LWG3834>`__","Missing ``constexpr`` for ``std::intmax_t`` math functions in ``<cinttypes>``","February 2023","","",""
+"`3839 <https://wg21.link/LWG3839>`__","``range_formatter``'s ``set_separator``, ``set_brackets``, and ``underlying`` functions should be ``noexcept``","February 2023","|Complete|","17.0","|format|"
+"`3841 <https://wg21.link/LWG3841>`__","``<version>`` should not be ""all freestanding""","February 2023","","",""
+"`3842 <https://wg21.link/LWG3842>`__","Unclear wording for ``precision`` in ``chrono-format-spec``","February 2023","|Complete|","16.0","|format|"
+"`3848 <https://wg21.link/LWG3848>`__","``adjacent_view``, ``adjacent_transform_view`` and ``slide_view`` missing ``base`` accessor","February 2023","","","|ranges|"
+"`3849 <https://wg21.link/LWG3849>`__","``cartesian_product_view::iterator``'s default constructor is overconstrained","February 2023","","","|ranges|"
+"`3850 <https://wg21.link/LWG3850>`__","``views::as_const`` on ``empty_view<T>`` should return ``empty_view<const T>``","February 2023","","","|ranges|"
+"`3851 <https://wg21.link/LWG3851>`__","``chunk_view::inner-iterator`` missing custom ``iter_move`` and ``iter_swap``","February 2023","","","|ranges|"
+"`3853 <https://wg21.link/LWG3853>`__","``basic_const_iterator<volatile int*>::operator->`` is ill-formed","February 2023","","",""
+"`3857 <https://wg21.link/LWG3857>`__","``basic_string_view`` should allow explicit conversion when only traits vary","February 2023","|Complete|","17.0",""
+"`3860 <https://wg21.link/LWG3860>`__","``range_common_reference_t`` is missing","February 2023","|Complete|","17.0","|ranges|"
+"`3866 <https://wg21.link/LWG3866>`__","Bad Mandates for ``expected::transform_error`` overloads","February 2023","","",""
+"`3867 <https://wg21.link/LWG3867>`__","Should ``std::basic_osyncstream``'s move assignment operator be ``noexcept``?","February 2023","","",""
+"`3441 <https://wg21.link/LWG3441>`__","Misleading note about calls to customization points","February 2023","","",""
+"`3622 <https://wg21.link/LWG3622>`__","Misspecified transitivity of equivalence in §[unord.req.general]","February 2023","","",""
+"`3631 <https://wg21.link/LWG3631>`__","``basic_format_arg(T&&)`` should use ``remove_cvref_t<T>`` throughout","February 2023","|Complete|","15.0",""
+"`3645 <https://wg21.link/LWG3645>`__","``resize_and_overwrite`` is overspecified to call its callback with lvalues","February 2023","|Complete|","14.0",""
+"`3655 <https://wg21.link/LWG3655>`__","The ``INVOKE`` operation and union types","February 2023","","",""
+"`3723 <https://wg21.link/LWG3723>`__","``priority_queue::push_range`` needs to ``append_range``","February 2023","","","|ranges|"
+"`3734 <https://wg21.link/LWG3734>`__","Inconsistency in ``inout_ptr`` and ``out_ptr`` for empty case","February 2023","","",""
+"`3772 <https://wg21.link/LWG3772>`__","``repeat_view``'s ``piecewise`` constructor is missing Postconditions","February 2023","","","|ranges|"
+"`3786 <https://wg21.link/LWG3786>`__","Flat maps' deduction guide needs to default ``Allocator`` to be useful","February 2023","","",""
+"`3803 <https://wg21.link/LWG3803>`__","``flat_foo`` constructors taking ``KeyContainer`` lack ``KeyCompare`` parameter","February 2023","","",""
+"`3810 <https://wg21.link/LWG3810>`__","CTAD for ``std::basic_format_args``","February 2023","|Complete|","17.0","|format|"
+"`3827 <https://wg21.link/LWG3827>`__","Deprecate ``<stdalign.h>`` and ``<stdbool.h>`` macros","February 2023","","",""
+"`3828 <https://wg21.link/LWG3828>`__","Sync ``intmax_t`` and ``uintmax_t`` with C2x","February 2023","","",""
+"`3833 <https://wg21.link/LWG3833>`__","Remove specialization ``template<size_t N> struct formatter<const charT[N], charT>``","February 2023","|Complete|","17.0","|format|"
+"`3836 <https://wg21.link/LWG3836>`__","``std::expected<bool, E1>`` conversion constructor ``expected(const expected<U, G>&)`` should take precedence over ``expected(U&&)`` with operator ``bool``","February 2023","","",""
+"`3843 <https://wg21.link/LWG3843>`__","``std::expected<T,E>::value() &`` assumes ``E`` is copy constructible","February 2023","","",""
+"`3847 <https://wg21.link/LWG3847>`__","``ranges::to`` can still return views","February 2023","","","|ranges|"
+"`3862 <https://wg21.link/LWG3862>`__","``basic_const_iterator``'s ``common_type`` specialization is underconstrained","February 2023","","",""
+"`3865 <https://wg21.link/LWG3865>`__","Sorting a range of ``pairs``","February 2023","|Complete|","17.0","|ranges|"
+"`3869 <https://wg21.link/LWG3869>`__","Deprecate ``std::errc`` constants related to UNIX STREAMS","February 2023","","",""
+"`3870 <https://wg21.link/LWG3870>`__","Remove ``voidify``","February 2023","","",""
+"`3871 <https://wg21.link/LWG3871>`__","Adjust note about ``terminate``","February 2023","","",""
+"`3872 <https://wg21.link/LWG3872>`__","``basic_const_iterator`` should have custom ``iter_move``","February 2023","","",""
+"`3875 <https://wg21.link/LWG3875>`__","``std::ranges::repeat_view<T, IntegerClass>::iterator`` may be ill-formed","February 2023","","","|ranges|"
+"`3876 <https://wg21.link/LWG3876>`__","Default constructor of ``std::layout_XX::mapping`` misses precondition","February 2023","","",""
+"`3877 <https://wg21.link/LWG3877>`__","Incorrect constraints on ``const``-qualified monadic overloads for ``std::expected``","February 2023","","",""
+"`3878 <https://wg21.link/LWG3878>`__","import ``std;`` should guarantee initialization of standard iostreams objects","February 2023","","",""
+"`3879 <https://wg21.link/LWG3879>`__","``erase_if`` for ``flat_{,multi}set`` is incorrectly specified","February 2023","","",""
+"`3880 <https://wg21.link/LWG3880>`__","Clarify ``operator+=`` complexity for ``{chunk,stride}_view::iterator``","February 2023","","","|ranges|"
+"`3881 <https://wg21.link/LWG3881>`__","Incorrect formatting of container adapters backed by ``std::string``","February 2023","|Complete|","17.0","|format|"
+"","","","","",""
 "`3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Yet Adopted","|Complete|","16.0",""
+"`3892 <https://wg21.link/LWG3892>`__","Incorrect formatting of nested ranges and tuples","Not Yet Adopted","|Complete|","17.0",""
diff --git a/third_party/llvm-project/libcxx/docs/Status/Cxx2bPapers.csv b/third_party/llvm-project/libcxx/docs/Status/Cxx2bPapers.csv
index e3f39d4..47ea734 100644
--- a/third_party/llvm-project/libcxx/docs/Status/Cxx2bPapers.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/Cxx2bPapers.csv
@@ -14,13 +14,13 @@
 "`P0401R6 <https://wg21.link/P0401R6>`__","LWG","Providing size feedback in the Allocator interface","June 2021","|Complete|","15.0"
 "`P0448R4 <https://wg21.link/P0448R4>`__","LWG","A strstream replacement using span<charT> as buffer","June 2021","",""
 "`P1132R8 <https://wg21.link/P1132R8>`__","LWG","out_ptr - a scalable output pointer abstraction","June 2021","",""
-"`P1328R1 <https://wg21.link/P1328R1>`__","LWG","Making std::type_info::operator== constexpr","June 2021","",""
+"`P1328R1 <https://wg21.link/P1328R1>`__","LWG","Making std::type_info::operator== constexpr","June 2021","|Complete|","17.0"
 "`P1425R4 <https://wg21.link/P1425R4>`__","LWG","Iterators pair constructors for stack and queue","June 2021","|Complete|","14.0","|ranges|"
 "`P1518R2 <https://wg21.link/P1518R2>`__","LWG","Stop overconstraining allocators in container deduction guides","June 2021","|Complete|","13.0"
 "`P1659R3 <https://wg21.link/P1659R3>`__","LWG","starts_with and ends_with","June 2021","","","|ranges|"
 "`P1951R1 <https://wg21.link/P1951R1>`__","LWG","Default Arguments for pair Forwarding Constructor","June 2021","|Complete|","14.0"
 "`P1989R2 <https://wg21.link/P1989R2>`__","LWG","Range constructor for std::string_view","June 2021","|Complete|","14.0","|ranges|"
-"`P2136R3 <https://wg21.link/P2136R3>`__","LWG","invoke_r","June 2021","",""
+"`P2136R3 <https://wg21.link/P2136R3>`__","LWG","invoke_r","June 2021","|Complete|","17.0"
 "`P2166R1 <https://wg21.link/P2166R1>`__","LWG","A Proposal to Prohibit std::basic_string and std::basic_string_view construction from nullptr","June 2021","|Complete|","13.0"
 "","","","","","",""
 "`P0288R9 <https://wg21.link/P0288R9>`__","LWG","``any_invocable``","October 2021","",""
@@ -84,12 +84,12 @@
 "`P2508R1 <https://wg21.link/P2508R1>`__","LWG","Exposing ``std::basic-format-string``","July 2022","|Complete|","15.0"
 "`P2513R4 <https://wg21.link/P2513R4>`__","LWG","``char8_t`` Compatibility and Portability Fixes","July 2022","",""
 "`P2517R1 <https://wg21.link/P2517R1>`__","LWG","Add a conditional ``noexcept`` specification to ``std::apply``","July 2022","",""
-"`P2520R0 <https://wg21.link/P2520R0>`__","LWG","``move_iterator`` should be a random access iterator","July 2022","","","|ranges|"
+"`P2520R0 <https://wg21.link/P2520R0>`__","LWG","``move_iterator`` should be a random access iterator","July 2022","|Complete| [#note-P2520R0]_","17.0","|ranges|"
 "`P2540R1 <https://wg21.link/P2540R1>`__","LWG","Empty Product for certain Views","July 2022","","","|ranges|"
 "`P2549R1 <https://wg21.link/P2549R1>`__","LWG","``std::unexpected`` should have ``error()`` as member accessor","July 2022","|Complete|","16.0"
 "`P2553R1 <https://wg21.link/P2553R1>`__","LWG","Make ``mdspan`` ``size_type`` controllable","July 2022","",""
 "`P2554R0 <https://wg21.link/P2554R0>`__","LWG","C-Array Interoperability of MDSpan","July 2022","",""
-"`P2585R0 <https://wg21.link/P2585R0>`__","LWG","Improving default container formatting","July 2022","|Partial|",""
+"`P2585R0 <https://wg21.link/P2585R0>`__","LWG","Improving default container formatting","July 2022","|Complete|","17.0"
 "`P2590R2 <https://wg21.link/P2590R2>`__","LWG","Explicit lifetime management","July 2022","",""
 "`P2599R2 <https://wg21.link/P2599R2>`__","LWG","``mdspan::size_type`` should be ``index_type``","July 2022","",""
 "`P2604R0 <https://wg21.link/P2604R0>`__","LWG","mdspan: rename pointer and contiguous","July 2022","",""
@@ -104,3 +104,22 @@
 "`P2539R4 <https://wg21.link/P2539R4>`__","LWG", "Should the output of ``std::print`` to a terminal be synchronized with the underlying stream?", "November 2022","","","|format|"
 "`P2602R2 <https://wg21.link/P2602R2>`__","LWG", "Poison Pills are Too Toxic", "November 2022","","","|ranges|"
 "`P2708R1 <https://wg21.link/P2708R1>`__","LWG", "No Further Fundamentals TSes", "November 2022","|Nothing to do|","",""
+"","","","","","",""
+"`P0290R4 <https://wg21.link/P0290R4>`__","LWG", "``apply()`` for ``synchronized_value<T>``","February 2023","","","|concurrency TS|"
+"`P2770R0 <https://wg21.link/P2770R0>`__","LWG", "Stashing stashing ``iterators`` for proper flattening","February 2023","","","|ranges|"
+"`P2164R9 <https://wg21.link/P2164R9>`__","LWG", "``views::enumerate``","February 2023","","","|ranges|"
+"`P2711R1 <https://wg21.link/P2711R1>`__","LWG", "Making multi-param constructors of ``views`` ``explicit``","February 2023","|Partial| [#note-P2711R1]_","","|ranges|"
+"`P2609R3 <https://wg21.link/P2609R3>`__","LWG", "Relaxing Ranges Just A Smidge","February 2023","","","|ranges|"
+"`P2713R1 <https://wg21.link/P2713R1>`__","LWG", "Escaping improvements in ``std::format``","February 2023","","","|format|"
+"`P2675R1 <https://wg21.link/P2675R1>`__","LWG", "``format``'s width estimation is too approximate and not forward compatible","February 2023","","","|format|"
+"`P2572R1 <https://wg21.link/P2572R1>`__","LWG", "``std::format`` fill character allowances","February 2023","","","|format|"
+"`P2693R1 <https://wg21.link/P2693R1>`__","LWG", "Formatting ``thread::id`` and ``stacktrace``","February 2023","|Partial| [#note-P2693R1]_","","|format|"
+"`P2679R2 <https://wg21.link/P2679R2>`__","LWG", "Fixing ``std::start_lifetime_as`` for arrays","February 2023","","",""
+"`P2674R1 <https://wg21.link/P2674R1>`__","LWG", "A trait for implicit lifetime types","February 2023","","",""
+"`P2655R3 <https://wg21.link/P2655R3>`__","LWG", "``common_reference_t`` of ``reference_wrapper`` Should Be a Reference Type","February 2023","","",""
+"`P2652R2 <https://wg21.link/P2652R2>`__","LWG", "Disallow User Specialization of ``allocator_traits``","February 2023","","",""
+"`P2787R1 <https://wg21.link/P2787R1>`__","LWG", "``pmr::generator`` - Promise Types are not Values","February 2023","","",""
+"`P2614R2 <https://wg21.link/P2614R2>`__","LWG", "Deprecate ``numeric_limits::has_denorm``","February 2023","","",""
+"`P2588R3 <https://wg21.link/P2588R3>`__","LWG", "``barrier``’s phase completion guarantees","February 2023","","",""
+"`P2763R1 <https://wg21.link/P2763R1>`__","LWG", "``layout_stride`` static extents default constructor fix","February 2023","","",""
+"`P2736R2 <https://wg21.link/P2736R2>`__","CWG","Referencing The Unicode Standard","February 2023","","","|format|"
diff --git a/third_party/llvm-project/libcxx/docs/Status/FormatIssues.csv b/third_party/llvm-project/libcxx/docs/Status/FormatIssues.csv
index 3299b6d..f072ce0 100644
--- a/third_party/llvm-project/libcxx/docs/Status/FormatIssues.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/FormatIssues.csv
@@ -8,9 +8,12 @@
 "`P2093R14 <https://wg21.link/P2093R14>`__","Formatted output","C++23"
 "`P2286R8 <https://wg21.link/P2286R8>`__","Formatting Ranges","C++23","Mark de Wever","|Complete|",Clang 16
 "`P2508R1 <https://wg21.link/P2508R1>`__","Exposing ``std::basic-format-string``","C++23","Mark de Wever","|Complete|", Clang 15
-"`P2585R0 <https://wg21.link/P2585R0>`__","Improving default container formatting","C++23","Mark de Wever","|In progress|"
+"`P2585R0 <https://wg21.link/P2585R0>`__","Improving default container formatting","C++23","Mark de Wever","|Complete|", Clang 17
 "`P2539R4 <https://wg21.link/P2539R4>`__","Should the output of ``std::print`` to a terminal be synchronized with the underlying stream?","C++23"
-
+"`P2713R1 <https://wg21.link/P2713R1>`__","Escaping improvements in ``std::format``","C++23","Mark de Wever",""
+"`P2675R1 <https://wg21.link/P2675R1>`__","``format``'s width estimation is too approximate and not forward compatible","C++23","Mark de Wever",""
+"`P2572R1 <https://wg21.link/P2572R1>`__","``std::format`` fill character allowances","C++23","Mark de Wever","|In progress|"
+"`P2693R1 <https://wg21.link/P2693R1>`__","Formatting ``thread::id`` and ``stacktrace``","C++23","Mark de Wever","|In progress|"
 `P1361 <https://wg21.link/P1361>`_,"Integration of chrono with text formatting","C++20",Mark de Wever,|In Progress|,
 `P2372 <https://wg21.link/P2372>`__,"Fixing locale handling in chrono formatters","C++20",Mark de Wever,|In Progress|,
 "`P2419R2 <https://wg21.link/P2419R2>`__","Clarify handling of encodings in localized formatting of chrono types","C++23",
diff --git a/third_party/llvm-project/libcxx/docs/Status/FormatPaper.csv b/third_party/llvm-project/libcxx/docs/Status/FormatPaper.csv
index 01585c0..19e8f03 100644
--- a/third_party/llvm-project/libcxx/docs/Status/FormatPaper.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/FormatPaper.csv
@@ -1,7 +1,7 @@
 Section,Description,Dependencies,Assignee,Status,First released version
 `P1361 <https://wg21.link/P1361>`__ `P2372 <https://wg21.link/P2372>`__,"Formatting chrono"
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::duration<Rep, Period>``",,Mark de Wever,|Complete|, Clang 16
-`[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::sys_time<Duration>``",,Mark de Wever,|In Progress|,
+`[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::sys_time<Duration>``",,Mark de Wever,|Complete|, Clang 17
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::utc_time<Duration>``",A ``<chrono>`` implementation,Not assigned,,,
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::tai_time<Duration>``",A ``<chrono>`` implementation,Not assigned,,,
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::gps_time<Duration>``",A ``<chrono>`` implementation,Not assigned,,,
@@ -23,7 +23,7 @@
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::year_month_day_last``",,Mark de Wever,|Complete|, Clang 16
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::year_month_weekday``",,Mark de Wever,|Complete|, Clang 16
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::year_month_weekday_last``",,Mark de Wever,|Complete|, Clang 16
-`[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::hh_mm_ss<duration<Rep, Period>>``",,Mark de Wever,|In Progress|,
+`[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::hh_mm_ss<duration<Rep, Period>>``",,Mark de Wever,|Complete|, Clang 17
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::sys_info``",A ``<chrono>`` implementation,Mark de Wever,,
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::local_info``",A ``<chrono>`` implementation,Mark de Wever,,
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::zoned_time<Duration, TimeZonePtr>``",A ``<chrono>`` implementation,Mark de Wever,,
@@ -37,4 +37,8 @@
 `[format.range] <https://wg21.link/format.range>`_,"Formatting for ranges: ``pair`` and ``tuple``",,Mark de Wever,|Complete|,Clang 16
 `[format.range] <https://wg21.link/format.range>`_,"Formatting for ranges: ``vector<bool>``",,Mark de Wever,|Complete|,Clang 16
 "`P2585R0 <https://wg21.link/P2585R0>`__","Improving default container formatting"
-`[format.range.fmtstr] <https://wg21.link/format.range.fmtstr>`_,"Formatting for ranges: strings",,Mark de Wever,|In Progress|,
+`[format.range.fmtstr] <https://wg21.link/format.range.fmtstr>`_,"Formatting for ranges: strings",,Mark de Wever,|Complete|,Clang 17
+`[format.range.fmtstr] <https://wg21.link/format.range.fmtstr>`_,"Formatting for ranges: debug_strings",,Mark de Wever,|Complete|,Clang 17
+"`P2693R1 <https://wg21.link/P2693R1>`__","Formatting ``thread::id`` and ``stacktrace``"
+`[thread.thread.id] <https://wg21.link/thread.thread.id>`_,"Formatting ``thread::id``",,Mark de Wever,|Complete|,Clang 17
+`[stacktrace.format] <https://wg21.link/stacktrace.format>`_,"Formatting ``stacktrace``",A ``<stacktrace>`` implementation,Mark de Wever,,
diff --git a/third_party/llvm-project/libcxx/docs/Status/Parallelism.rst b/third_party/llvm-project/libcxx/docs/Status/Parallelism.rst
new file mode 100644
index 0000000..4fce429
--- /dev/null
+++ b/third_party/llvm-project/libcxx/docs/Status/Parallelism.rst
@@ -0,0 +1,29 @@
+.. parallelism-status:
+
+====================================
+libc++ Parallelism TS Status (N4808)
+====================================
+
+.. include:: ../Helpers/Styles.rst
+
+.. contents::
+  :local:
+
+Overview
+========
+
+This document contains the status of the Parallelism TS implementation in libc++.
+It is used to track both the status of the sub-projects of the effort and who
+is assigned to these sub-projects. This avoids duplicating effort.
+
+If you are interested in contributing to this effort, please send a message
+to the #libcxx channel in the LLVM discord. Please *do not* start working
+on any items below that has already been assigned to someone else.
+
+Sub-projects in the Implementation Effort
+=========================================
+
+.. csv-table::
+  :file: ParallelismProjects.csv
+  :header-rows: 1
+  :widths: auto
diff --git a/third_party/llvm-project/libcxx/docs/Status/ParallelismProjects.csv b/third_party/llvm-project/libcxx/docs/Status/ParallelismProjects.csv
new file mode 100644
index 0000000..de59ad6
--- /dev/null
+++ b/third_party/llvm-project/libcxx/docs/Status/ParallelismProjects.csv
@@ -0,0 +1,12 @@
+Section,Description,Dependencies,Assignee,Complete
+| `[parallel.exceptions] <https://wg21.link/N4808>`_, "Parallel Exceptions", None, unassigned, |Not Started|
+| `[parallel.execpol] <https://wg21.link/N4808>`_, "Execution policies", None, unassigned, |Not Started|
+| `[parallel.alg] <https://wg21.link/N4808>`_, "Parallel algorithms", None, unassigned, |Not Started|
+| `[parallel.taskblock] <https://wg21.link/N4808>`_, "Task Block", None, unassigned, |Not Started|
+| `[parallel.simd.abi] <https://wg21.link/N4808>`_, "simd ABI tags", None, Yin Zhang, |In Progress|
+| `[parallel.simd.traits] <https://wg21.link/N4808>`_, "simd type traits", None, Yin Zhang, |In Progress|
+| `[parallel.simd.whereexpr] <https://wg21.link/N4808>`_, "Where expression class templates", None, Yin Zhang, |In Progress|
+| `[parallel.simd.class] <https://wg21.link/N4808>`_, "Class template simd", None, Yin Zhang, |In Progress|
+| `[parallel.simd.nonmembers] <https://wg21.link/N4808>`_, "simd non-member operations", None, Yin Zhang, |In Progress|
+| `[parallel.simd.mask.class] <https://wg21.link/N4808>`_, "Class template simd_mask", None, Yin Zhang, |In Progress|
+| `[parallel.simd.mask.nonmembers] <https://wg21.link/N4808>`_, "simd_mask non-member operations", None, Yin Zhang, |In Progress|
diff --git a/third_party/llvm-project/libcxx/docs/Status/RangesViews.csv b/third_party/llvm-project/libcxx/docs/Status/RangesViews.csv
index 3bc9c62..f38e0d6 100644
--- a/third_party/llvm-project/libcxx/docs/Status/RangesViews.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/RangesViews.csv
@@ -12,7 +12,7 @@
 C++20,`drop <https://wg21.link/P1035R7>`_,Zoe Carver,`D102037 <https://llvm.org/D102037>`_,✅
 C++20,`drop_while <https://wg21.link/P1035R7>`_,Hui Xie,`D135460 <https://llvm.org/D135460>`_,✅
 C++20,`join <https://wg21.link/P0896R4>`_,Zoe Carver,`D107671 <https://llvm.org/D107671>`_,✅
-C++20,`split <https://wg21.link/P2210R2>`_,Unassigned,No patch yet,Not started
+C++20,`split <https://wg21.link/P2210R2>`_,Hui Xie,`D142063 <https://llvm.org/D142063>`_,✅
 C++20,`lazy_split <https://wg21.link/P0896R4>`_,Zoe Carver and Konstantin Varlamov,`D107500 <https://llvm.org/D107500>`_,✅
 C++20,`counted <https://wg21.link/P0896R4>`_,Zoe Carver,`D106923 <https://llvm.org/D106923>`_,✅
 C++20,`common <https://wg21.link/P0896R4>`_,Zoe Carver,`D105753 <https://llvm.org/D105753>`_,✅
@@ -33,5 +33,5 @@
 C++23,`chunk <https://wg21.link/P2442R1>`_,Unassigned,No patch yet,Not started
 C++23,`chunk_by <https://wg21.link/P2443R1>`_,Unassigned,No patch yet,Not started
 C++23,`as_const <https://wg21.link/P2278R4>`_,Unassigned,No patch yet,Not started
-C++23,`as_rvalue <https://wg21.link/P2446R2>`_,Nikolas Klauser,`D137637 <https://llvm.org/D137637>`_,Complete
+C++23,`as_rvalue <https://wg21.link/P2446R2>`_,Nikolas Klauser,`D137637 <https://llvm.org/D137637>`_,✅
 C++23,`stride <https://wg21.link/P1899R3>`_,Unassigned,No patch yet,Not started
diff --git a/third_party/llvm-project/libcxx/docs/Status/SpaceshipProjects.csv b/third_party/llvm-project/libcxx/docs/Status/SpaceshipProjects.csv
index f732ec7..02eac26 100644
--- a/third_party/llvm-project/libcxx/docs/Status/SpaceshipProjects.csv
+++ b/third_party/llvm-project/libcxx/docs/Status/SpaceshipProjects.csv
@@ -11,7 +11,7 @@
 | `strong_order_fallback <https://reviews.llvm.org/D111514>`_
 | `weak_order_fallback <https://reviews.llvm.org/D111514>`_
 | `partial_order_fallback <https://reviews.llvm.org/D111514>`_",None,Arthur O'Dwyer,|Complete| [#note-strongorder]_
-| `[alg.three.way] <https://wg21.link/alg.three.way>`_,| `lexicographical_compare_three_way <https://reviews.llvm.org/D131395>`_,[comparisons.three.way],Adrian Vogelsgesang,|In Progress|
+| `[alg.three.way] <https://wg21.link/alg.three.way>`_,| `lexicographical_compare_three_way <https://reviews.llvm.org/D131395>`_,[comparisons.three.way],Adrian Vogelsgesang,|Complete|
 | `[type.info] <https://wg21.link/type.info>`_,| `typeinfo <https://reviews.llvm.org/D130853>`_,None,Adrian Vogelsgesang,|Complete|
 | `[coroutine.handle.compare] <https://wg21.link/coroutine.handle.compare>`_,| `coroutine_handle <https://reviews.llvm.org/D109433>`_,[comparisons.three.way],Chuanqi Xu,|Complete|
 | `[pairs.spec] <https://wg21.link/pairs.spec>`_,| `pair <https://reviews.llvm.org/D107721>`_,[expos.only.func],Kent Ross,|Complete|
@@ -21,8 +21,8 @@
 | `[tuple.rel] <https://wg21.link/tuple.rel>`_,| `tuple <https://reviews.llvm.org/D108250>`_,[expos.only.func],Kent Ross,|Complete|
 "| `[optional.relops] <https://wg21.link/optional.relops>`_
 | `[optional.nullops] <https://wg21.link/optional.nullops>`_
-| `[optional.comp.with.t] <https://wg21.link/optional.comp.with.t>`_","| optional
-| nullopt",None,Kent Ross,|In Progress|
+| `[optional.comp.with.t] <https://wg21.link/optional.comp.with.t>`_","| `optional <https://reviews.llvm.org/D146392>`_
+| `nullopt <https://reviews.llvm.org/D146392>`_",None,Hristo Hristov,|In Progress|
 "| `[variant.relops] <https://wg21.link/variant.relops>`_
 | `[variant.monostate.relops] <https://wg21.link/variant.monostate.relops>`_","| `monostate <https://reviews.llvm.org/D131372>`_
 | `variant <https://reviews.llvm.org/D131372>`_",None,Kent Ross,|Complete|
@@ -31,29 +31,29 @@
 | `[type.index.members] <https://wg21.link/type.index.members>`_,| `type_index <https://reviews.llvm.org/D131357>`_,None,Adrian Vogelsgesang,|Complete|
 | `[charconv.syn] <https://wg21.link/charconv.syn>`_,| `to_chars_result <https://reviews.llvm.org/D112366>`_,None,Mark de Wever,|Complete|
 | `[charconv.syn] <https://wg21.link/charconv.syn>`_,| `from_chars_result <https://reviews.llvm.org/D112366>`_,None,Mark de Wever,|Complete|
-| `[stacktrace.entry.cmp] <https://wg21.link/stacktrace.entry.cmp>`_,| stacktrace_entry,None,Unassigned,|Not Started|
-| `[stacktrace.basic.cmp] <https://wg21.link/stacktrace.basic.cmp>`_,| basic_stacktrace,[alg.three.way],Unassigned,|Not Started|
+| `[stacktrace.entry.cmp] <https://wg21.link/stacktrace.entry.cmp>`_,| `stacktrace_entry <https://reviews.llvm.org/D123228>`_,None,Nikolas Klauser,|In Progress|
+| `[stacktrace.basic.cmp] <https://wg21.link/stacktrace.basic.cmp>`_,| `basic_stacktrace <https://reviews.llvm.org/D123228>`_,[alg.three.way],Nikolas Klauser,|In Progress|
 | `[string.cmp] <https://wg21.link/string.cmp>`_,| `basic_string <https://reviews.llvm.org/D131421>`_,None,Mark de Wever,|Complete|
 | `[string.view.comparison] <https://wg21.link/string.view.comparison>`_,| `basic_string_view <https://reviews.llvm.org/D130295>`_,None,Mark de Wever,|Complete|
 | `[array.syn] <https://wg21.link/array.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| `array <https://reviews.llvm.org/D132265>`_,[expos.only.func],Adrian Vogelsgesang,|In Progress|
-| `[deque.syn] <https://wg21.link/deque.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| deque,[expos.only.func],Unassigned,|Not Started|
-| `[forward.list.syn] <https://wg21.link/forward.list.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| forward_list,[expos.only.func],Unassigned,|Not Started|
-| `[list.syn] <https://wg21.link/list.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| list,[expos.only.func],Unassigned,|Not Started|
+| `[deque.syn] <https://wg21.link/deque.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| `deque <https://reviews.llvm.org/D144821>`_,[expos.only.func],Hristo Hristov,|Complete|
+| `[forward.list.syn] <https://wg21.link/forward.list.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| `forward_list <https://reviews.llvm.org/D145172>`_,[expos.only.func],Hristo Hristov,|Complete|
+| `[list.syn] <https://wg21.link/list.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| `list <https://reviews.llvm.org/D132312>`_,[expos.only.func],Adrian Vogelsgesang,|Complete|
 | `[vector.syn] <https://wg21.link/vector.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),| `vector <https://reviews.llvm.org/D132268>`_,[expos.only.func],Adrian Vogelsgesang,|In Progress|
-| `[associative.map.syn] <https://wg21.link/associative.map.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),"| map
-| multimap",[expos.only.func],Unassigned,|Not Started|
+| `[associative.map.syn] <https://wg21.link/associative.map.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),"| `map <https://reviews.llvm.org/D145976>`_
+| `multimap <https://reviews.llvm.org/D145976>`_",[expos.only.func],Hristo Hristov,|Complete|
 | `[associative.set.syn] <https://wg21.link/associative.set.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),"| multiset
-| set",[expos.only.func],Unassigned,|Not Started|
-| `[queue.ops] <https://wg21.link/queue.ops>`_,| queue,None,Unassigned,|Not Started|
-| `[stack.ops] <https://wg21.link/stack.ops>`_,| stack,None,Unassigned,|Not Started|
+| set",[expos.only.func],Hristo Hristov,|In Progress|
+| `[queue.ops] <https://wg21.link/queue.ops>`_,| `queue <https://reviews.llvm.org/D146066>`_,None,Hristo Hristov,|In Progress|
+| `[stack.ops] <https://wg21.link/stack.ops>`_,| `stack <https://reviews.llvm.org/D146094>`_,None,Hristo Hristov,|In Progress|
 | `[reverse.iter.cmp] <https://wg21.link/reverse.iter.cmp>`_,| `reverse_iterator <https://reviews.llvm.org/D113695>`_,None,Mikhail Maltsev,|Complete|
-| `[move.iter.op.comp] <https://wg21.link/move.iter.op.comp>`_,| move_iterator,None,Unassigned,|Not Started|
-| `[counted.iter.cmp] <https://wg21.link/counted.iter.cmp>`_,| counted_iterator,None,Unassigned,|Not Started|
+| `[move.iter.op.comp] <https://wg21.link/move.iter.op.comp>`_,| `move_iterator <https://reviews.llvm.org/D117656>`_,None,Arthur O'Dwyer,|Complete|
+| `[counted.iter.cmp] <https://wg21.link/counted.iter.cmp>`_,| `counted_iterator <https://reviews.llvm.org/D106205>`_,None,Zoe Carver,|Complete|
 | `[range.iota.iterator] <https://wg21.link/range.iota.iterator>`_,| `ranges::iota_view::iterator <https://reviews.llvm.org/D110774>`_,[concepts.cmp],Arthur O'Dwyer,|Complete|
 | `[range.transform.iterator] <https://wg21.link/range.transform.iterator>`_,| `ranges::transform_view::iterator <https://reviews.llvm.org/D110774>`_,[concepts.cmp],Arthur O'Dwyer,|Complete|
 | `[range.elements.iterator] <https://wg21.link/range.elements.iterator>`_,| ranges::elements_view::iterator,[concepts.cmp],Hui Xie,|Complete|
-| `[time.duration.comparisons] <https://wg21.link/time.duration.comparisons>`_, "chrono::duration", None, Mark de Wever, |Not Started|
-| `[time.point.comparisons] <https://wg21.link/time.point.comparisons>`_, "chrono::time_point", None, Mark de Wever, |Not Started|
+| `[time.duration.comparisons] <https://wg21.link/time.duration.comparisons>`_, `chrono::duration <https://reviews.llvm.org/D145881>`_, None, Hristo Hristov, |Complete|
+| `[time.point.comparisons] <https://wg21.link/time.point.comparisons>`_, `chrono::time_point <https://reviews.llvm.org/D146250>`_, None, Hristo Hristov, |Complete|
 "| `[time.cal.day.nonmembers] <https://wg21.link/time.cal.day.nonmembers>`_
 | `[time.cal.month.nonmembers] <https://wg21.link/time.cal.month.nonmembers>`_
 | `[time.cal.year.nonmembers] <https://wg21.link/time.cal.year.nonmembers>`_
@@ -77,5 +77,5 @@
 | `[fs.filesystem.syn] <https://wg21.link/fs.filesystem.syn>`_,| `filesystem::space_info <https://reviews.llvm.org/D130861>`_,None,Adrian Vogelsgesang,|Complete|
 | `[fs.path.nonmember] <https://wg21.link/fs.path.nonmember>`_,| `filesystem::path <https://reviews.llvm.org/D130859>`_,None,Adrian Vogelsgesang,|Complete|
 | `[fs.dir.entry.obs] <https://wg21.link/fs.dir.entry.obs>`_,| `filesystem::directory_entry <https://reviews.llvm.org/D130860>`_,None,Adrian Vogelsgesang,|Complete|
-| `[re.submatch.op] <https://wg21.link/re.submatch.op>`_,| sub_match,None,Mark de Wever,|In Progress|
+| `[re.submatch.op] <https://wg21.link/re.submatch.op>`_,| `sub_match <https://reviews.llvm.org/D132310>`_,None,Mark de Wever,|In Progress|
 | `[thread.thread.id] <https://wg21.link/thread.thread.id>`_,| `thread::id <https://reviews.llvm.org/D131362>`_,None,Adrian Vogelsgesang,|Complete|
diff --git a/third_party/llvm-project/libcxx/docs/TestingLibcxx.rst b/third_party/llvm-project/libcxx/docs/TestingLibcxx.rst
index 283646a..9a69000 100644
--- a/third_party/llvm-project/libcxx/docs/TestingLibcxx.rst
+++ b/third_party/llvm-project/libcxx/docs/TestingLibcxx.rst
@@ -5,6 +5,8 @@
 .. contents::
   :local:
 
+.. _testing:
+
 Getting Started
 ===============
 
@@ -100,8 +102,28 @@
 These tools are:
 - clang-tidy (you might need additional dev packages to compile libc++-specific clang-tidy checks)
 
+Reproducing CI issues locally
+-----------------------------
+
+Libc++ has extensive CI that tests various configurations of the library. The testing for
+all these configurations is located in ``libcxx/utils/ci/run-buildbot``. Most of our
+CI jobs are being run on a Docker image for reproducibility. The definition of this Docker
+image is located in ``libcxx/utils/ci/Dockerfile``. If you are looking to reproduce the
+failure of a specific CI job locally, you should first drop into a Docker container that
+matches our CI images by running ``libcxx/utils/ci/run-buildbot-container``, and then run
+the specific CI job that you're interested in (from within the container) using the ``run-buildbot``
+script above. If you want to control which compiler is used, you can set the ``CC`` and the
+``CXX`` environment variables before calling ``run-buildbot`` to select the right compiler.
+Take note that some CI jobs are testing the library on specific platforms and are *not* run
+in our Docker image. In the general case, it is not possible to reproduce these failures
+locally, unless they aren't specific to the platform.
+
+Also note that the Docker container shares the same filesystem as your local machine, so
+modifying files on your local machine will also modify what the Docker container sees.
+This is useful for editing source files as you're testing your code in the Docker container.
+
 Writing Tests
--------------
+=============
 
 When writing tests for the libc++ test suite, you should follow a few guidelines.
 This will ensure that your tests can run on a wide variety of hardware and under
@@ -123,6 +145,189 @@
   necessarily available on all devices we may want to run the tests on (even
   though supporting Python is probably trivial for the build-host).
 
+Structure of the testing related directories
+--------------------------------------------
+
+The tests of libc++ are stored in libc++'s testing related subdirectories:
+
+- ``libcxx/test/support`` This directory contains several helper headers with
+  generic parts for the tests. The most important header is ``test_macros.h``.
+  This file contains configuration information regarding the platform used.
+  This is similar to the ``__config`` file in libc++'s ``include`` directory.
+  Since libc++'s tests are used by other Standard libraries, tests should use
+  the ``TEST_FOO`` macros instead of the ``_LIBCPP_FOO`` macros, which are
+  specific to libc++.
+- ``libcxx/test/std`` This directory contains the tests that validate the library under
+  test conforms to the C++ Standard. The paths and the names of the test match
+  the section names in the C++ Standard. Note that the C++ Standard sometimes
+  reorganises its structure, therefore some tests are at a location based on
+  where they appeared historically in the standard. We try to strike a balance
+  between keeping things at up-to-date locations and unnecessary churn.
+- ``libcxx/test/libcxx`` This directory contains the tests that validate libc++
+  specific behavior and implementation details. For example, libc++ has
+  "wrapped iterators" that perform bounds checks. Since those are specific to
+  libc++ and not mandated by the Standard, tests for those are located under
+  ``libcxx/test/libcxx``. The structure of this directories follows the
+  structure of ``libcxx/test/std``.
+
+Structure of a test
+-------------------
+
+Some platforms where libc++ is tested have requirement on the signature of
+``main`` and require ``main`` to explicitly return a value. Therefore the
+typical ``main`` function should look like:
+
+.. code-block:: cpp
+
+  int main(int, char**) {
+    ...
+    return 0;
+  }
+
+
+The C++ Standard has ``constexpr`` requirements. The typical way to test that,
+is to create a helper ``test`` function that returns a ``bool`` and use the
+following ``main`` function:
+
+.. code-block:: cpp
+
+  constexpr bool test() {
+    ...
+    return true;
+  }
+
+  int main(int, char**) {
+    test()
+    static_assert(test());
+
+    return 0;
+  }
+
+Tests in libc++ mainly use ``assert`` and ``static_assert`` for testing. There
+are a few helper macros and function that can be used to make it easier to
+write common tests.
+
+libcxx/test/support/assert_macros.h
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The header contains several macros with user specified log messages. This is
+useful when a normal assertion failure lacks the information to easily
+understand why the test has failed. This usually happens when the test is in a
+helper function. For example the ``std::format`` tests use a helper function
+for its validation. When the test fails it will give the line in the helper
+function with the condition ``out == expected`` failed. Without knowing what
+the value of ``format string``, ``out`` and ``expected`` are it is not easy to
+understand why the test has failed. By logging these three values the point of
+failure can be found without resorting to a debugger.
+
+Several of these macros are documented to take an ``ARG``. This ``ARG``:
+
+ - if it is a ``const char*`` or ``std::string`` its contents are written to
+   the ``stderr``,
+ - otherwise it must be a callable that is invoked without any additional
+   arguments and is expected to produce useful output to e.g. ``stderr``.
+
+This makes it possible to write additional information when a test fails,
+either by supplying a hard-coded string or generate it at runtime.
+
+TEST_FAIL(ARG)
+^^^^^^^^^^^^^^
+
+This macro is an unconditional failure with a log message ``ARG``. The main
+use-case is to fail when code is reached that should be unreachable.
+
+
+TEST_REQUIRE(CONDITION, ARG)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This macro requires its ``CONDITION`` to evaluate to ``true``. If that fails it
+will fail the test with a log message ``ARG``.
+
+
+TEST_LIBCPP_REQUIRE((CONDITION, ARG)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If the library under test is libc++ it behaves like ``TEST_REQUIRE``, else it
+is a no-op. This makes it possible to test libc++ specific behaviour. For
+example testing whether the ``what()`` of an exception thrown matches libc++'s
+expectations. (Usually the Standard requires certain exceptions to be thrown,
+but not the contents of its ``what()`` message.)
+
+
+TEST_DOES_NOT_THROW(EXPR)
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Validates execution of ``EXPR`` does not throw an exception.
+
+TEST_THROWS_TYPE(TYPE, EXPR)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Validates the execution of ``EXPR`` throws an exception of the type ``TYPE``.
+
+
+TEST_VALIDATE_EXCEPTION(TYPE, PRED, EXPR)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Validates the execution of ``EXPR`` throws an exception of the type ``TYPE``
+which passes validation of ``PRED``. Using this macro makes it easier to write
+tests using exceptions. The code to write a test manually would be:
+
+
+.. code-block:: cpp
+
+  void test_excption([[maybe_unused]] int arg) {
+  #ifndef TEST_HAS_NO_EXCEPTIONS // do nothing when tests are disabled
+    try {
+      foo(arg);
+      assert(false); // validates foo really throws
+    } catch ([[maybe_unused]] const bar& e) {
+      LIBCPP_ASSERT(e.what() == what);
+      return;
+    }
+    assert(false); // validates bar was thrown
+  #endif
+    }
+
+The same test using a macro:
+
+.. code-block:: cpp
+
+  void test_excption([[maybe_unused]] int arg) {
+    TEST_VALIDATE_EXCEPTION(bar,
+                            [](const bar& e) {
+                              LIBCPP_ASSERT(e.what() == what);
+                            },
+                            foo(arg));
+    }
+
+
+libcxx/test/support/concat_macros.h
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This file contains a helper macro ``TEST_WRITE_CONCATENATED`` to lazily
+concatenate its arguments to a ``std::string`` and write it to ``stderr``. When
+the output can't be concatenated a default message will be written to
+``stderr``. This is useful for tests where the arguments use different
+character types like ``char`` and ``wchar_t``, the latter can't simply be
+written to ``stderrr``.
+
+This macro is in a different header as ``assert_macros.h`` since it pulls in
+additional headers.
+
+ .. note: This macro can only be used in test using C++20 or newer. The macro
+          was added at a time where most of lib++'s C++17 support was complete.
+          Since it is not expected to add this to existing tests no effort was
+          taken to make it work in earlier language versions.
+
+
+Additional reading
+------------------
+
+The function ``CxxStandardLibraryTest`` in the file
+``libcxx/utils/libcxx/test/format.py`` has documentation about writing test. It
+explains the difference between the test named  ``foo.pass.cpp`` and named
+``foo.verify.cpp`` are.
+
 Benchmarks
 ==========
 
diff --git a/third_party/llvm-project/libcxx/docs/index.rst b/third_party/llvm-project/libcxx/docs/index.rst
index 265d23c..abcdeab 100644
--- a/third_party/llvm-project/libcxx/docs/index.rst
+++ b/third_party/llvm-project/libcxx/docs/index.rst
@@ -44,6 +44,7 @@
    Status/Cxx20
    Status/Cxx2b
    Status/Format
+   Status/Parallelism
    Status/Ranges
    Status/Spaceship
    Status/Zip
@@ -116,11 +117,11 @@
 =============== ========================= ============================
 Target platform Target architecture       Notes
 =============== ========================= ============================
-macOS 10.9+     i386, x86_64, arm64       Building the shared library itself requires targetting macOS 10.11+
-FreeBSD 10+     i386, x86_64, arm
-Linux           i386, x86_64, arm, arm64
+macOS 10.9+     i386, x86_64, arm64       Building the shared library itself requires targetting macOS 10.13+
+FreeBSD 12+     i386, x86_64, arm
+Linux           i386, x86_64, arm, arm64  Only glibc-2.24 and later and no other libc is officially supported
 Windows         i386, x86_64              Both MSVC and MinGW style environments
-AIX             powerpc, powerpc64
+AIX 7.2TL5+     powerpc, powerpc64
 =============== ========================= ============================
 
 Generally speaking, libc++ should work on any platform that provides a fairly complete
diff --git a/third_party/llvm-project/libcxx/include/CMakeLists.txt b/third_party/llvm-project/libcxx/include/CMakeLists.txt
index a12aa1d..439cddd 100644
--- a/third_party/llvm-project/libcxx/include/CMakeLists.txt
+++ b/third_party/llvm-project/libcxx/include/CMakeLists.txt
@@ -44,6 +44,7 @@
   __algorithm/iter_swap.h
   __algorithm/iterator_operations.h
   __algorithm/lexicographical_compare.h
+  __algorithm/lexicographical_compare_three_way.h
   __algorithm/lower_bound.h
   __algorithm/make_heap.h
   __algorithm/make_projected.h
@@ -183,6 +184,7 @@
   __algorithm/stable_partition.h
   __algorithm/stable_sort.h
   __algorithm/swap_ranges.h
+  __algorithm/three_way_comp_ref_type.h
   __algorithm/transform.h
   __algorithm/uniform_random_bit_generator_adaptor.h
   __algorithm/unique.h
@@ -191,6 +193,20 @@
   __algorithm/unwrap_range.h
   __algorithm/upper_bound.h
   __assert
+  __atomic/aliases.h
+  __atomic/atomic.h
+  __atomic/atomic_base.h
+  __atomic/atomic_flag.h
+  __atomic/atomic_init.h
+  __atomic/atomic_lock_free.h
+  __atomic/atomic_sync.h
+  __atomic/check_memory_order.h
+  __atomic/contention_t.h
+  __atomic/cxx_atomic_impl.h
+  __atomic/fence.h
+  __atomic/is_always_lock_free.h
+  __atomic/kill_dependency.h
+  __atomic/memory_order.h
   __availability
   __bit/bit_cast.h
   __bit/bit_ceil.h
@@ -209,11 +225,17 @@
   __bsd_locale_defaults.h
   __bsd_locale_fallbacks.h
   __charconv/chars_format.h
+  __charconv/from_chars_integral.h
   __charconv/from_chars_result.h
   __charconv/tables.h
+  __charconv/to_chars.h
   __charconv/to_chars_base_10.h
+  __charconv/to_chars_floating_point.h
+  __charconv/to_chars_integral.h
   __charconv/to_chars_result.h
+  __charconv/traits.h
   __chrono/calendar.h
+  __chrono/concepts.h
   __chrono/convert_to_timespec.h
   __chrono/convert_to_tm.h
   __chrono/day.h
@@ -272,6 +294,7 @@
   __concepts/semiregular.h
   __concepts/swappable.h
   __concepts/totally_ordered.h
+  __condition_variable/condition_variable.h
   __config
   __coroutine/coroutine_handle.h
   __coroutine/coroutine_traits.h
@@ -279,7 +302,11 @@
   __coroutine/trivial_awaitables.h
   __debug
   __debug_utils/randomize_range.h
-  __errc
+  __exception/exception.h
+  __exception/exception_ptr.h
+  __exception/nested_exception.h
+  __exception/operations.h
+  __exception/terminate.h
   __expected/bad_expected_access.h
   __expected/expected.h
   __expected/unexpect.h
@@ -414,6 +441,7 @@
   __mbstate_t.h
   __memory/addressof.h
   __memory/align.h
+  __memory/aligned_alloc.h
   __memory/allocate_at_least.h
   __memory/allocation_guard.h
   __memory/allocator.h
@@ -446,7 +474,10 @@
   __memory_resource/pool_options.h
   __memory_resource/synchronized_pool_resource.h
   __memory_resource/unsynchronized_pool_resource.h
-  __mutex_base
+  __mutex/lock_guard.h
+  __mutex/mutex.h
+  __mutex/tag_types.h
+  __mutex/unique_lock.h
   __node_handle
   __numeric/accumulate.h
   __numeric/adjacent_difference.h
@@ -537,8 +568,8 @@
   __ranges/views.h
   __ranges/zip_view.h
   __split_buffer
-  __std_stream
   __string/char_traits.h
+  __string/constexpr_c_functions.h
   __string/extern_template_lists.h
   __support/android/locale_bionic.h
   __support/fuchsia/xlocale.h
@@ -556,20 +587,25 @@
   __support/xlocale/__nop_locale_mgmt.h
   __support/xlocale/__posix_l_fallback.h
   __support/xlocale/__strtonum_fallback.h
+  __system_error/errc.h
+  __system_error/error_category.h
+  __system_error/error_code.h
+  __system_error/error_condition.h
+  __system_error/system_error.h
   __thread/poll_with_backoff.h
   __thread/timed_backoff_policy.h
   __threading_support
   __tree
-  __tuple_dir/apply_cv.h
-  __tuple_dir/make_tuple_types.h
-  __tuple_dir/pair_like.h
-  __tuple_dir/sfinae_helpers.h
-  __tuple_dir/tuple_element.h
-  __tuple_dir/tuple_indices.h
-  __tuple_dir/tuple_like.h
-  __tuple_dir/tuple_like_ext.h
-  __tuple_dir/tuple_size.h
-  __tuple_dir/tuple_types.h
+  __tuple/apply_cv.h
+  __tuple/make_tuple_types.h
+  __tuple/pair_like.h
+  __tuple/sfinae_helpers.h
+  __tuple/tuple_element.h
+  __tuple/tuple_indices.h
+  __tuple/tuple_like.h
+  __tuple/tuple_like_ext.h
+  __tuple/tuple_size.h
+  __tuple/tuple_types.h
   __type_traits/add_const.h
   __type_traits/add_cv.h
   __type_traits/add_lvalue_reference.h
@@ -619,6 +655,7 @@
   __type_traits/is_destructible.h
   __type_traits/is_empty.h
   __type_traits/is_enum.h
+  __type_traits/is_equality_comparable.h
   __type_traits/is_final.h
   __type_traits/is_floating_point.h
   __type_traits/is_function.h
@@ -683,6 +720,7 @@
   __type_traits/nat.h
   __type_traits/negation.h
   __type_traits/noexcept_move_assign_container.h
+  __type_traits/predicate_traits.h
   __type_traits/promote.h
   __type_traits/rank.h
   __type_traits/remove_all_extents.h
@@ -771,11 +809,8 @@
   expected
   experimental/__config
   experimental/__memory
-  experimental/algorithm
-  experimental/coroutine
   experimental/deque
   experimental/forward_list
-  experimental/functional
   experimental/iterator
   experimental/list
   experimental/map
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/clamp.h b/third_party/llvm-project/libcxx/include/__algorithm/clamp.h
index 30ddbdc..336b93f 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/clamp.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/clamp.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Tp, class _Compare>
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY constexpr
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/comp.h b/third_party/llvm-project/libcxx/include/__algorithm/comp.h
index af8eb7b..1001e42 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/comp.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/comp.h
@@ -10,6 +10,8 @@
 #define _LIBCPP___ALGORITHM_COMP_H
 
 #include <__config>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/predicate_traits.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -24,6 +26,9 @@
   }
 };
 
+template <class _Lhs, class _Rhs>
+struct __is_trivial_equality_predicate<__equal_to, _Lhs, _Rhs> : true_type {};
+
 template <class _T1, class _T2 = _T1>
 struct __less
 {
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/copy_n.h b/third_party/llvm-project/libcxx/include/__algorithm/copy_n.h
index b08bbdf..7089ef3 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/copy_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/copy_n.h
@@ -12,8 +12,8 @@
 #include <__algorithm/copy.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/enable_if.h>
 #include <__utility/convert_to_integral.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/equal.h b/third_party/llvm-project/libcxx/include/__algorithm/equal.h
index cf37f46..a26299a 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/equal.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/equal.h
@@ -11,9 +11,20 @@
 #define _LIBCPP___ALGORITHM_EQUAL_H
 
 #include <__algorithm/comp.h>
+#include <__algorithm/unwrap_iter.h>
 #include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
 #include <__iterator/distance.h>
 #include <__iterator/iterator_traits.h>
+#include <__string/constexpr_c_functions.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_constant_evaluated.h>
+#include <__type_traits/is_equality_comparable.h>
+#include <__type_traits/is_volatile.h>
+#include <__type_traits/predicate_traits.h>
+#include <__utility/move.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,23 +33,42 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
-_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
-equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) {
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_iter_impl(
+    _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate& __pred) {
   for (; __first1 != __last1; ++__first1, (void)++__first2)
     if (!__pred(*__first1, *__first2))
       return false;
   return true;
 }
 
+template <
+    class _Tp,
+    class _Up,
+    class _BinaryPredicate,
+    __enable_if_t<__is_trivial_equality_predicate<_BinaryPredicate, _Tp, _Up>::value && !is_volatile<_Tp>::value &&
+                      !is_volatile<_Up>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value,
+                  int> = 0>
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+__equal_iter_impl(_Tp* __first1, _Tp* __last1, _Up* __first2, _BinaryPredicate&) {
+  return std::__constexpr_memcmp(__first1, __first2, (__last1 - __first1) * sizeof(_Tp)) == 0;
+}
+
+template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) {
+  return std::__equal_iter_impl(
+      std::__unwrap_iter(__first1), std::__unwrap_iter(__last1), std::__unwrap_iter(__first2), __pred);
+}
+
 template <class _InputIterator1, class _InputIterator2>
-_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) {
   return std::equal(__first1, __last1, __first2, __equal_to());
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _BinaryPredicate, class _InputIterator1, class _InputIterator2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
 __equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2,
         _BinaryPredicate __pred, input_iterator_tag, input_iterator_tag) {
   for (; __first1 != __last1 && __first2 != __last2; ++__first1, (void)++__first2)
@@ -47,19 +77,52 @@
   return __first1 == __last1 && __first2 == __last2;
 }
 
+template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_impl(
+    _Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2, _Pred& __comp, _Proj1& __proj1, _Proj2& __proj2) {
+  while (__first1 != __last1 && __first2 != __last2) {
+    if (!std::__invoke(__comp, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
+      return false;
+    ++__first1;
+    ++__first2;
+  }
+  return __first1 == __last1 && __first2 == __last2;
+}
+
+template <class _Tp,
+          class _Up,
+          class _Pred,
+          class _Proj1,
+          class _Proj2,
+          __enable_if_t<__is_trivial_equality_predicate<_Pred, _Tp, _Up>::value && __is_identity<_Proj1>::value &&
+                            __is_identity<_Proj2>::value && !is_volatile<_Tp>::value && !is_volatile<_Up>::value &&
+                            __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value,
+                        int> = 0>
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_impl(
+    _Tp* __first1, _Tp* __last1, _Up* __first2, _Up*, _Pred&, _Proj1&, _Proj2&) {
+  return std::__constexpr_memcmp(__first1, __first2, (__last1 - __first1) * sizeof(_Tp)) == 0;
+}
+
 template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
 __equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, _RandomAccessIterator2 __first2,
         _RandomAccessIterator2 __last2, _BinaryPredicate __pred, random_access_iterator_tag,
         random_access_iterator_tag) {
   if (_VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2))
     return false;
-  return _VSTD::equal<_RandomAccessIterator1, _RandomAccessIterator2,
-                      _BinaryPredicate&>(__first1, __last1, __first2, __pred);
+  __identity __proj;
+  return std::__equal_impl(
+      std::__unwrap_iter(__first1),
+      std::__unwrap_iter(__last1),
+      std::__unwrap_iter(__first2),
+      std::__unwrap_iter(__last2),
+      __pred,
+      __proj,
+      __proj);
 }
 
 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
-_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2,
       _BinaryPredicate __pred) {
   return _VSTD::__equal<_BinaryPredicate&>(
@@ -68,7 +131,7 @@
 }
 
 template <class _InputIterator1, class _InputIterator2>
-_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
   return std::__equal(
       __first1,
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/fill.h b/third_party/llvm-project/libcxx/include/__algorithm/fill.h
index 76cf4a1..0753c42 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/fill.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/fill.h
@@ -12,7 +12,6 @@
 #include <__algorithm/fill_n.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/fill_n.h b/third_party/llvm-project/libcxx/include/__algorithm/fill_n.h
index fe58c8d..e7863ac 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/fill_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/fill_n.h
@@ -12,7 +12,6 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__utility/convert_to_integral.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/find_end.h b/third_party/llvm-project/libcxx/include/__algorithm/find_end.h
index e2fee6b..edb9891 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/find_end.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/find_end.h
@@ -15,12 +15,12 @@
 #include <__algorithm/search.h>
 #include <__config>
 #include <__functional/identity.h>
+#include <__functional/invoke.h>
 #include <__iterator/advance.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/next.h>
 #include <__iterator/reverse_iterator.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/for_each_n.h b/third_party/llvm-project/libcxx/include/__algorithm/for_each_n.h
index 38d204a..5bd7318 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/for_each_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/for_each_n.h
@@ -12,7 +12,6 @@
 
 #include <__config>
 #include <__utility/convert_to_integral.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -20,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _InputIterator, class _Size, class _Function>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator for_each_n(_InputIterator __first,
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/generate_n.h b/third_party/llvm-project/libcxx/include/__algorithm/generate_n.h
index 4525998..ff5c82d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/generate_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/generate_n.h
@@ -11,7 +11,6 @@
 
 #include <__config>
 #include <__utility/convert_to_integral.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/half_positive.h b/third_party/llvm-project/libcxx/include/__algorithm/half_positive.h
index 74aede2..5a0f4ba 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/half_positive.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/half_positive.h
@@ -10,7 +10,9 @@
 #define _LIBCPP___ALGORITHM_HALF_POSITIVE_H
 
 #include <__config>
-#include <type_traits>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_integral.h>
+#include <__type_traits/make_unsigned.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_found_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_found_result.h
index 3134d6e..d9ca287 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_found_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_found_result.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -44,6 +44,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_IN_FOUND_RESULT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_fun_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_fun_result.h
index 3cbb9e1..33374ed 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_fun_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_fun_result.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 template <class _InIter1, class _Func1>
@@ -42,7 +42,7 @@
 };
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_in_out_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_in_out_result.h
index 3e747be..6b50e0e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_in_out_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_in_out_result.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -49,7 +49,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_in_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_in_result.h
index 2098c18..1eceb9d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_in_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_in_result.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -46,7 +46,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_out_out_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_out_out_result.h
index 4046eee..2f7a09b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_out_out_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_out_out_result.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 template <class _InIter1, class _OutIter1, class _OutIter2>
@@ -47,7 +47,7 @@
 };
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/in_out_result.h b/third_party/llvm-project/libcxx/include/__algorithm/in_out_result.h
index 7f5a027..158b355 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/in_out_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/in_out_result.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -46,7 +46,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/is_permutation.h b/third_party/llvm-project/libcxx/include/__algorithm/is_permutation.h
index 0054456..2a7c606 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/is_permutation.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/is_permutation.h
@@ -19,8 +19,8 @@
 #include <__iterator/distance.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/next.h>
+#include <__type_traits/is_callable.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -31,7 +31,7 @@
 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class = void>
 struct _ConstTimeDistance : false_type {};
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2>
 struct _ConstTimeDistance<_Iter1, _Sent1, _Iter2, _Sent2, __enable_if_t<
@@ -47,7 +47,7 @@
     is_same<typename iterator_traits<_Iter2>::iterator_category, random_access_iterator_tag>::value
 > > : true_type {};
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 // Internal functions
 
@@ -202,7 +202,7 @@
   return std::is_permutation(__first1, __last1, __first2, __equal_to());
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 // 2+2 iterators
 template <class _ForwardIterator1, class _ForwardIterator2>
@@ -231,7 +231,7 @@
       __pred, __identity(), __identity());
 }
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/iterator_operations.h b/third_party/llvm-project/libcxx/include/__algorithm/iterator_operations.h
index bd3e6f1..2bdc0ac 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/iterator_operations.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/iterator_operations.h
@@ -37,7 +37,7 @@
 
 template <class _AlgPolicy> struct _IterOps;
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 struct _RangeAlgPolicy {};
 
 template <>
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/lexicographical_compare_three_way.h b/third_party/llvm-project/libcxx/include/__algorithm/lexicographical_compare_three_way.h
new file mode 100644
index 0000000..377c8d2
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__algorithm/lexicographical_compare_three_way.h
@@ -0,0 +1,125 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H
+#define _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H
+
+#include <__algorithm/min.h>
+#include <__algorithm/three_way_comp_ref_type.h>
+#include <__compare/compare_three_way.h>
+#include <__compare/ordering.h>
+#include <__concepts/arithmetic.h>
+#include <__config>
+#include <__iterator/iterator_traits.h>
+#include <__type_traits/common_type.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 20
+
+// Fast path for random access iterators which computes the number of loop iterations up-front and
+// then skips the iterator comparisons inside the loop.
+template <class _InputIterator1, class _InputIterator2, class _Cmp>
+_LIBCPP_HIDE_FROM_ABI constexpr auto __lexicographical_compare_three_way_fast_path(
+    _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp& __comp)
+    -> decltype(__comp(*__first1, *__first2)) {
+  static_assert(
+      signed_integral<__iter_diff_t<_InputIterator1>>, "Using a non-integral difference_type is undefined behavior.");
+  static_assert(
+      signed_integral<__iter_diff_t<_InputIterator2>>, "Using a non-integral difference_type is undefined behavior.");
+
+  using _Len1   = __iter_diff_t<_InputIterator1>;
+  using _Len2   = __iter_diff_t<_InputIterator2>;
+  using _Common = common_type_t<_Len1, _Len2>;
+
+  _Len1 __len1      = __last1 - __first1;
+  _Len2 __len2      = __last2 - __first2;
+  _Common __min_len = std::min<_Common>(__len1, __len2);
+
+  for (_Common __i = 0; __i < __min_len; ++__i) {
+    auto __c = __comp(*__first1, *__first2);
+    if (__c != 0) {
+      return __c;
+    }
+    ++__first1;
+    ++__first2;
+  }
+
+  return __len1 <=> __len2;
+}
+
+// Unoptimized implementation which compares the iterators against the end in every loop iteration
+template <class _InputIterator1, class _InputIterator2, class _Cmp>
+_LIBCPP_HIDE_FROM_ABI constexpr auto __lexicographical_compare_three_way_slow_path(
+    _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp& __comp)
+    -> decltype(__comp(*__first1, *__first2)) {
+  while (true) {
+    bool __exhausted1 = __first1 == __last1;
+    bool __exhausted2 = __first2 == __last2;
+
+    if (__exhausted1 || __exhausted2) {
+      if (!__exhausted1)
+        return strong_ordering::greater;
+      if (!__exhausted2)
+        return strong_ordering::less;
+      return strong_ordering::equal;
+    }
+
+    auto __c = __comp(*__first1, *__first2);
+    if (__c != 0) {
+      return __c;
+    }
+
+    ++__first1;
+    ++__first2;
+  }
+}
+
+template <class _InputIterator1, class _InputIterator2, class _Cmp>
+_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto lexicographical_compare_three_way(
+    _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp __comp)
+    -> decltype(__comp(*__first1, *__first2)) {
+  static_assert(__comparison_category<decltype(__comp(*__first1, *__first2))>,
+                "The comparator passed to lexicographical_compare_three_way must return a comparison category type.");
+  static_assert(std::is_copy_constructible_v<_InputIterator1>, "Iterators must be copy constructible.");
+  static_assert(std::is_copy_constructible_v<_InputIterator2>, "Iterators must be copy constructible.");
+  __three_way_comp_ref_type<_Cmp> __wrapped_comp_ref(__comp);
+  if constexpr (__is_cpp17_random_access_iterator<_InputIterator1>::value &&
+                __is_cpp17_random_access_iterator<_InputIterator2>::value) {
+    return std::__lexicographical_compare_three_way_fast_path(
+        std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __wrapped_comp_ref);
+  } else {
+    // Unoptimized implementation which compares the iterators against the end in every loop iteration
+    return std::__lexicographical_compare_three_way_slow_path(
+        std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __wrapped_comp_ref);
+  }
+}
+
+template <class _InputIterator1, class _InputIterator2>
+_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto lexicographical_compare_three_way(
+    _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
+  return std::lexicographical_compare_three_way(
+      std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), std::compare_three_way());
+}
+
+#endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h b/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h
index 2648982..8109393 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h
@@ -20,7 +20,6 @@
 #include <__iterator/iterator_traits.h>
 #include <__type_traits/is_callable.h>
 #include <__type_traits/remove_reference.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/make_projected.h b/third_party/llvm-project/libcxx/include/__algorithm/make_projected.h
index 87d4d59..defda46 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/make_projected.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/make_projected.h
@@ -55,25 +55,12 @@
 
 };
 
-template <class _Pred, class _Proj, class = void>
-struct __can_use_pristine_comp : false_type {};
-
-template <class _Pred, class _Proj>
-struct __can_use_pristine_comp<_Pred, _Proj, __enable_if_t<
-    !is_member_pointer<typename decay<_Pred>::type>::value && (
-#if _LIBCPP_STD_VER > 17
-      is_same<typename decay<_Proj>::type, identity>::value ||
-#endif
-      is_same<typename decay<_Proj>::type, __identity>::value
-    )
-> > : true_type {};
-
-template <class _Pred, class _Proj>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR static
-__enable_if_t<
-    !__can_use_pristine_comp<_Pred, _Proj>::value,
-    _ProjectedPred<_Pred, _Proj>
->
+template <class _Pred,
+          class _Proj,
+          __enable_if_t<!(!is_member_pointer<__decay_t<_Pred> >::value &&
+                            __is_identity<__decay_t<_Proj> >::value),
+                        int> = 0>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ProjectedPred<_Pred, _Proj>
 __make_projected(_Pred& __pred, _Proj& __proj) {
   return _ProjectedPred<_Pred, _Proj>(__pred, __proj);
 }
@@ -81,28 +68,27 @@
 // Avoid creating the functor and just use the pristine comparator -- for certain algorithms, this would enable
 // optimizations that rely on the type of the comparator. Additionally, this results in less layers of indirection in
 // the call stack when the comparator is invoked, even in an unoptimized build.
-template <class _Pred, class _Proj>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR static
-__enable_if_t<
-    __can_use_pristine_comp<_Pred, _Proj>::value,
-    _Pred&
->
-__make_projected(_Pred& __pred, _Proj&) {
+template <class _Pred,
+          class _Proj,
+          __enable_if_t<!is_member_pointer<__decay_t<_Pred> >::value &&
+                          __is_identity<__decay_t<_Proj> >::value,
+                        int> = 0>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Pred& __make_projected(_Pred& __pred, _Proj&) {
   return __pred;
 }
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
 
 template <class _Comp, class _Proj1, class _Proj2>
-_LIBCPP_HIDE_FROM_ABI constexpr static
+_LIBCPP_HIDE_FROM_ABI constexpr
 decltype(auto) __make_projected_comp(_Comp& __comp, _Proj1& __proj1, _Proj2& __proj2) {
-  if constexpr (same_as<decay_t<_Proj1>, identity> && same_as<decay_t<_Proj2>, identity> &&
+  if constexpr (__is_identity<decay_t<_Proj1>>::value && __is_identity<decay_t<_Proj2>>::value &&
                 !is_member_pointer_v<decay_t<_Comp>>) {
     // Avoid creating the lambda and just use the pristine comparator -- for certain algorithms, this would enable
     // optimizations that rely on the type of the comparator.
@@ -121,6 +107,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_MAKE_PROJECTED_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/max.h b/third_party/llvm-project/libcxx/include/__algorithm/max.h
index a08a3fc..97f61f2 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/max.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/max.h
@@ -28,7 +28,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 const _Tp&
-max(const _Tp& __a, const _Tp& __b, _Compare __comp)
+max(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp)
 {
     return __comp(__a, __b) ? __b : __a;
 }
@@ -37,7 +37,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 const _Tp&
-max(const _Tp& __a, const _Tp& __b)
+max(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b)
 {
     return _VSTD::max(__a, __b, __less<_Tp>());
 }
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/min.h b/third_party/llvm-project/libcxx/include/__algorithm/min.h
index 2882485..d073a16 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/min.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/min.h
@@ -28,7 +28,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 const _Tp&
-min(const _Tp& __a, const _Tp& __b, _Compare __comp)
+min(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp)
 {
     return __comp(__b, __a) ? __b : __a;
 }
@@ -37,7 +37,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 const _Tp&
-min(const _Tp& __a, const _Tp& __b)
+min(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b)
 {
     return _VSTD::min(__a, __b, __less<_Tp>());
 }
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/min_max_result.h b/third_party/llvm-project/libcxx/include/__algorithm/min_max_result.h
index 4be3999..ef2d990 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/min_max_result.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/min_max_result.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -47,7 +47,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/minmax.h b/third_party/llvm-project/libcxx/include/__algorithm/minmax.h
index 6ef0a77..f486de2 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/minmax.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/minmax.h
@@ -27,7 +27,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 pair<const _Tp&, const _Tp&>
-minmax(const _Tp& __a, const _Tp& __b, _Compare __comp)
+minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp)
 {
     return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) :
                               pair<const _Tp&, const _Tp&>(__a, __b);
@@ -37,7 +37,7 @@
 _LIBCPP_NODISCARD_EXT inline
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
 pair<const _Tp&, const _Tp&>
-minmax(const _Tp& __a, const _Tp& __b)
+minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b)
 {
     return std::minmax(__a, __b, __less<_Tp>());
 }
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/minmax_element.h b/third_party/llvm-project/libcxx/include/__algorithm/minmax_element.h
index caa963e..1ac4078 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/minmax_element.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/minmax_element.h
@@ -12,9 +12,10 @@
 #include <__algorithm/comp.h>
 #include <__config>
 #include <__functional/identity.h>
+#include <__functional/invoke.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_callable.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/mismatch.h b/third_party/llvm-project/libcxx/include/__algorithm/mismatch.h
index 600e2cd..e5b014f 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/mismatch.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/mismatch.h
@@ -38,7 +38,7 @@
   return std::mismatch(__first1, __last1, __first2, __equal_to());
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY
     _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator1, _InputIterator2>
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/partial_sort.h b/third_party/llvm-project/libcxx/include/__algorithm/partial_sort.h
index e0812af..4b8e0e7 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/partial_sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/partial_sort.h
@@ -19,8 +19,9 @@
 #include <__debug>
 #include <__debug_utils/randomize_range.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_copy_assignable.h>
+#include <__type_traits/is_copy_constructible.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/partition.h b/third_party/llvm-project/libcxx/include/__algorithm/partition.h
index 0e094bf8..a58dd64 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/partition.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/partition.h
@@ -14,7 +14,6 @@
 #include <__iterator/iterator_traits.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/pop_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/pop_heap.h
index 94d32a4..4187523 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/pop_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/pop_heap.h
@@ -17,8 +17,9 @@
 #include <__assert>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_copy_assignable.h>
+#include <__type_traits/is_copy_constructible.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/push_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/push_heap.h
index 9068495..e831162 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/push_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/push_heap.h
@@ -14,8 +14,9 @@
 #include <__algorithm/iterator_operations.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_copy_assignable.h>
+#include <__type_traits/is_copy_constructible.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_adjacent_find.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_adjacent_find.h
index d338d13..e3de36b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_adjacent_find.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_adjacent_find.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -73,6 +73,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_all_of.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_all_of.h
index e45c4e5..494a77d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_all_of.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_all_of.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -63,6 +63,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ALL_OF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_any_of.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_any_of.h
index e7d1e72..eb102bd 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_any_of.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_any_of.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -63,6 +63,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ANY_OF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_binary_search.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_binary_search.h
index b2a8977..d89597e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_binary_search.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_binary_search.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -36,7 +36,7 @@
   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
   bool operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
     auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
-    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__first));
+    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
   }
 
   template <forward_range _Range, class _Type, class _Proj = identity,
@@ -46,7 +46,7 @@
     auto __first = ranges::begin(__r);
     auto __last = ranges::end(__r);
     auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
-    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__first));
+    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
   }
 };
 } // namespace __binary_search
@@ -58,6 +58,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_clamp.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_clamp.h
index 09a97fc..45a8464 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_clamp.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_clamp.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -60,6 +60,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_CLAMP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy.h
index bb02c84..f5700c3 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -62,6 +62,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_backward.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_backward.h
index f41af66..b7b5b88 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_backward.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_backward.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -60,6 +60,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_if.h
index dba41c3..b714e4c 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_if.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -76,6 +76,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_n.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_n.h
index 04bb80b..30ee019 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_copy_n.h
@@ -27,7 +27,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -70,7 +70,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_count.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_count.h
index 527dd06..677ee38 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_count.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_count.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -57,6 +57,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_count_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_count_if.h
index 931618b..48c4370 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_count_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_count_if.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -67,6 +67,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal.h
index 3c417f0..8754453 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal.h
@@ -9,6 +9,8 @@
 #ifndef _LIBCPP___ALGORITHM_RANGES_EQUAL_H
 #define _LIBCPP___ALGORITHM_RANGES_EQUAL_H
 
+#include <__algorithm/equal.h>
+#include <__algorithm/unwrap_range.h>
 #include <__config>
 #include <__functional/identity.h>
 #include <__functional/invoke.h>
@@ -24,36 +26,13 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
 namespace __equal {
 struct __fn {
-private:
-  template <class _Iter1, class _Sent1,
-            class _Iter2, class _Sent2,
-            class _Pred,
-            class _Proj1,
-            class _Proj2>
-  _LIBCPP_HIDE_FROM_ABI constexpr static
-  bool __equal_impl(_Iter1 __first1, _Sent1 __last1,
-                    _Iter2 __first2, _Sent2 __last2,
-                    _Pred& __pred,
-                    _Proj1& __proj1,
-                    _Proj2& __proj2) {
-    while (__first1 != __last1 && __first2 != __last2) {
-      if (!std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__first2)))
-        return false;
-      ++__first1;
-      ++__first2;
-    }
-    return __first1 == __last1 && __first2 == __last2;
-  }
-
-public:
-
   template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
             input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
             class _Pred = ranges::equal_to,
@@ -70,11 +49,13 @@
       if (__last1 - __first1 != __last2 - __first2)
         return false;
     }
-    return __equal_impl(std::move(__first1), std::move(__last1),
-                        std::move(__first2), std::move(__last2),
-                        __pred,
-                        __proj1,
-                        __proj2);
+    auto __unwrapped1 = std::__unwrap_range(std::move(__first1), std::move(__last1));
+    auto __unwrapped2 = std::__unwrap_range(std::move(__first2), std::move(__last2));
+    return std::__equal_impl(std::move(__unwrapped1.first), std::move(__unwrapped1.second),
+                             std::move(__unwrapped2.first), std::move(__unwrapped2.second),
+                             __pred,
+                             __proj1,
+                             __proj2);
   }
 
   template <input_range _Range1,
@@ -93,11 +74,13 @@
       if (ranges::distance(__range1) != ranges::distance(__range2))
         return false;
     }
-    return __equal_impl(ranges::begin(__range1), ranges::end(__range1),
-                        ranges::begin(__range2), ranges::end(__range2),
-                        __pred,
-                        __proj1,
-                        __proj2);
+    auto __unwrapped1 = std::__unwrap_range(ranges::begin(__range1), ranges::end(__range1));
+    auto __unwrapped2 = std::__unwrap_range(ranges::begin(__range2), ranges::end(__range2));
+    return std::__equal_impl(std::move(__unwrapped1.first), std::move(__unwrapped1.second),
+                             std::move(__unwrapped2.first), std::move(__unwrapped2.second),
+                             __pred,
+                             __proj1,
+                             __proj2);
     return false;
   }
 };
@@ -110,6 +93,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal_range.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal_range.h
index 94dc058..075634a 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal_range.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_equal_range.h
@@ -30,7 +30,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -73,6 +73,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill.h
index 6ebc2bd..4e0594c 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill.h
@@ -20,7 +20,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -54,6 +54,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill_n.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill_n.h
index a2660e8..c5f7e6e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_fill_n.h
@@ -17,7 +17,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -43,6 +43,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_N_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find.h
index 580c2a1..87f25d1 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -58,6 +58,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_end.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_end.h
index ea36f4d..2d46e8c 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_end.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_end.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -93,6 +93,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_END_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_first_of.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_first_of.h
index 9d66e75..5699583 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_first_of.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_first_of.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -96,6 +96,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if.h
index 45ce6e4..6e2bd4c 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if.h
@@ -24,14 +24,14 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
 
 template <class _Ip, class _Sp, class _Pred, class _Proj>
-_LIBCPP_HIDE_FROM_ABI static constexpr
+_LIBCPP_HIDE_FROM_ABI constexpr
 _Ip __find_if_impl(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) {
   for (; __first != __last; ++__first) {
     if (std::invoke(__pred, std::invoke(__proj, *__first)))
@@ -66,6 +66,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if_not.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if_not.h
index 3dd1213..e60ee2b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if_not.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_find_if_not.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -58,6 +58,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_NOT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each.h
index 0c70c05..a72f779 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -73,6 +73,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each_n.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each_n.h
index 261816a..daf0a5d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_for_each_n.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -61,6 +61,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_N_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate.h
index ae486ae..de0db16 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -68,6 +68,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate_n.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate_n.h
index e625e3a..122cd8d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_generate_n.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -57,6 +57,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_N_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_includes.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_includes.h
index 8438117..314a923 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_includes.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_includes.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -90,6 +90,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_INCLUDES_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_inplace_merge.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_inplace_merge.h
index 88171a6..8f78975 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_inplace_merge.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_inplace_merge.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -80,6 +80,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap.h
index a16c075..9c77e0c 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -69,6 +69,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_IS_HEAP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap_until.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap_until.h
index 8c8dac5..3b1fec7 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap_until.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_heap_until.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -70,6 +70,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_IS_HEAP_UNTIL_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_partitioned.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_partitioned.h
index b903953..6782717 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_partitioned.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_partitioned.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -76,6 +76,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_permutation.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_permutation.h
index b617500..95a0a82 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_permutation.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_permutation.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -84,6 +84,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PERMUTATION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted.h
index ce3032f..50c97ba 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -56,6 +56,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP__ALGORITHM_RANGES_IS_SORTED_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted_until.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted_until.h
index 17fc42e..f139d03 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted_until.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_is_sorted_until.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -71,6 +71,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP__ALGORITHM_RANGES_IS_SORTED_UNTIL_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_iterator_concept.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_iterator_concept.h
index 3ac6b31..9a92030 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_iterator_concept.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_iterator_concept.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -46,6 +46,6 @@
 } // namespace ranges
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ITERATOR_CONCEPT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_lexicographical_compare.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_lexicographical_compare.h
index 2972e32..c51f4d7 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_lexicographical_compare.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_lexicographical_compare.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -93,6 +93,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_LEXICOGRAPHICAL_COMPARE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_lower_bound.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_lower_bound.h
index 78cbb6d..7435639 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_lower_bound.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_lower_bound.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -61,6 +61,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_LOWER_BOUND_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_make_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_make_heap.h
index f25c7ab..7f92fa3 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_make_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_make_heap.h
@@ -32,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -75,6 +75,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MAKE_HEAP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_max.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_max.h
index 55aef99..2fd2970 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_max.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_max.h
@@ -20,6 +20,7 @@
 #include <__iterator/projected.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
+#include <__type_traits/is_trivially_copyable.h>
 #include <__utility/move.h>
 #include <initializer_list>
 
@@ -27,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
@@ -40,7 +41,10 @@
   template <class _Tp, class _Proj = identity,
             indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
-  const _Tp& operator()(const _Tp& __a, const _Tp& __b, _Comp __comp = {}, _Proj __proj = {}) const {
+  const _Tp& operator()(_LIBCPP_LIFETIMEBOUND const _Tp& __a,
+                        _LIBCPP_LIFETIMEBOUND const _Tp& __b,
+                        _Comp __comp = {},
+                        _Proj __proj = {}) const {
     return std::invoke(__comp, std::invoke(__proj, __a), std::invoke(__proj, __b)) ? __b : __a;
   }
 
@@ -64,7 +68,7 @@
 
     _LIBCPP_ASSERT(__first != __last, "range must contain at least one element");
 
-    if constexpr (forward_range<_Rp>) {
+    if constexpr (forward_range<_Rp> && !__is_cheap_to_copy<range_value_t<_Rp>>) {
       auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) { return std::invoke(__comp, __rhs, __lhs); };
       return *ranges::__min_element_impl(std::move(__first), std::move(__last), __comp_lhs_rhs_swapped, __proj);
     } else {
@@ -88,6 +92,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP_STD_VER > 17 &&
+#endif // _LIBCPP_STD_VER >= 20 &&
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MAX_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_max_element.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_max_element.h
index 490f320..39e86d3 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_max_element.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_max_element.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -56,6 +56,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_merge.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_merge.h
index b36a05a..c5797b0 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_merge.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_merge.h
@@ -20,14 +20,14 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -137,6 +137,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MERGE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_min.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_min.h
index 0e31f57..5e941a1 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_min.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_min.h
@@ -20,13 +20,14 @@
 #include <__iterator/projected.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
+#include <__type_traits/is_trivially_copyable.h>
 #include <initializer_list>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
@@ -39,7 +40,10 @@
   template <class _Tp, class _Proj = identity,
             indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
-  const _Tp& operator()(const _Tp& __a, const _Tp& __b, _Comp __comp = {}, _Proj __proj = {}) const {
+  const _Tp& operator()(_LIBCPP_LIFETIMEBOUND const _Tp& __a,
+                        _LIBCPP_LIFETIMEBOUND const _Tp& __b,
+                        _Comp __comp = {},
+                        _Proj __proj = {}) const {
     return std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)) ? __b : __a;
   }
 
@@ -58,10 +62,8 @@
   range_value_t<_Rp> operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
     auto __first = ranges::begin(__r);
     auto __last = ranges::end(__r);
-
     _LIBCPP_ASSERT(__first != __last, "range must contain at least one element");
-
-    if constexpr (forward_range<_Rp>) {
+    if constexpr (forward_range<_Rp> && !__is_cheap_to_copy<range_value_t<_Rp>>) {
       return *ranges::__min_element_impl(__first, __last, __comp, __proj);
     } else {
       range_value_t<_Rp> __result = *__first;
@@ -84,6 +86,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP_STD_VER > 17 &&
+#endif // _LIBCPP_STD_VER >= 20 &&
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MIN_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_min_element.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_min_element.h
index 1751874..4c58adb 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_min_element.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_min_element.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -32,7 +32,7 @@
 
 // TODO(ranges): `ranges::min_element` can now simply delegate to `std::__min_element`.
 template <class _Ip, class _Sp, class _Proj, class _Comp>
-_LIBCPP_HIDE_FROM_ABI static constexpr
+_LIBCPP_HIDE_FROM_ABI constexpr
 _Ip __min_element_impl(_Ip __first, _Sp __last, _Comp& __comp, _Proj& __proj) {
   if (__first == __last)
     return __first;
@@ -69,6 +69,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax.h
index f82e005..86540cc 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax.h
@@ -13,11 +13,13 @@
 #include <__algorithm/minmax_element.h>
 #include <__assert>
 #include <__concepts/copyable.h>
+#include <__concepts/same_as.h>
 #include <__config>
 #include <__functional/identity.h>
 #include <__functional/invoke.h>
 #include <__functional/ranges_operations.h>
 #include <__iterator/concepts.h>
+#include <__iterator/next.h>
 #include <__iterator/projected.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
@@ -30,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
@@ -46,7 +48,10 @@
   template <class _Type, class _Proj = identity,
             indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less>
   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_result<const _Type&>
-  operator()(const _Type& __a, const _Type& __b, _Comp __comp = {}, _Proj __proj = {}) const {
+  operator()(_LIBCPP_LIFETIMEBOUND const _Type& __a,
+             _LIBCPP_LIFETIMEBOUND const _Type& __b,
+             _Comp __comp = {},
+             _Proj __proj = {}) const {
     if (std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)))
       return {__b, __a};
     return {__a, __b};
@@ -73,6 +78,18 @@
     _LIBCPP_ASSERT(__first != __last, "range has to contain at least one element");
 
     if constexpr (forward_range<_Range>) {
+      // Special-case the one element case. Avoid repeatedly initializing objects from the result of an iterator
+      // dereference when doing so might not be idempotent. The `if constexpr` avoids the extra branch in cases where
+      // it's not needed.
+      if constexpr (!same_as<remove_cvref_t<range_reference_t<_Range>>, _ValueT> ||
+                    is_rvalue_reference_v<range_reference_t<_Range>>) {
+        if (ranges::next(__first) == __last) {
+          // During initialization, members are allowed to refer to already initialized members
+          // (see http://eel.is/c++draft/dcl.init.aggr#6)
+          minmax_result<_ValueT> __result = {*__first, __result.min};
+          return __result;
+        }
+      }
       auto __result = std::__minmax_element_impl(__first, __last, __comp, __proj);
       return {*__result.first, *__result.second};
     } else {
@@ -83,6 +100,8 @@
                                    std::invoke(__proj, std::forward<decltype(__b)>(__b)));
       };
 
+      // During initialization, members are allowed to refer to already initialized members
+      // (see http://eel.is/c++draft/dcl.init.aggr#6)
       ranges::minmax_result<_ValueT> __result = {*__first, __result.min};
       if (__first == __last || ++__first == __last)
         return __result;
@@ -129,6 +148,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax_element.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax_element.h
index 6699f96..cbf3505 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax_element.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_minmax_element.h
@@ -23,13 +23,12 @@
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -67,6 +66,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_mismatch.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_mismatch.h
index 4fd0517..098c415 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_mismatch.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_mismatch.h
@@ -27,7 +27,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -78,7 +78,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_move.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_move.h
index 46a0970..5e06e90 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_move.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_move.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -66,6 +66,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MOVE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h
index d4e8eb1..95c2c66 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -68,6 +68,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_next_permutation.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_next_permutation.h
index 6c8e8e1..9ebab3e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_next_permutation.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_next_permutation.h
@@ -28,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -68,6 +68,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_NEXT_PERMUTATION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_none_of.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_none_of.h
index b39e570..39940ad 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_none_of.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_none_of.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -63,6 +63,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_NONE_OF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_nth_element.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_nth_element.h
index d9ec4f1..96bf33b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_nth_element.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_nth_element.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -75,6 +75,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort.h
index 3ea0a7f..4562c35 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort.h
@@ -33,7 +33,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -73,6 +73,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PARTIAL_SORT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort_copy.h
index 212db55..5401a37 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partial_sort_copy.h
@@ -30,7 +30,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -87,6 +87,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PARTIAL_SORT_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition.h
index 8b3aae5..de839de 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition.h
@@ -27,13 +27,12 @@
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -78,6 +77,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_copy.h
index e7a9a34..a271428 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_copy.h
@@ -20,13 +20,12 @@
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -93,6 +92,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_point.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_point.h
index 2bd118d..129ebb6 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_point.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_partition_point.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -83,6 +83,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_POINT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_pop_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_pop_heap.h
index 65beec8..54ea97d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_pop_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_pop_heap.h
@@ -32,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -76,6 +76,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_POP_HEAP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_prev_permutation.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_prev_permutation.h
index 6866d90..bf06287 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_prev_permutation.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_prev_permutation.h
@@ -28,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -72,6 +72,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PREV_PERMUTATION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_push_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_push_heap.h
index a1f4347..6e65d11 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_push_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_push_heap.h
@@ -32,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -75,6 +75,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_PUSH_HEAP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove.h
index dd5c5fb..6dd48e0 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -59,6 +59,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy.h
index 2102228..a9a19c1 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -71,6 +71,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy_if.h
index 4fc6745..e6d043e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_copy_if.h
@@ -29,7 +29,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -85,6 +85,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_if.h
index 1f17467..7507c21 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_remove_if.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -80,6 +80,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace.h
index 8b12bea..258e25d 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -69,6 +69,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy.h
index f87a236..79eaebb 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -86,6 +86,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy_if.h
index b8741ec..8ff2eba 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_copy_if.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -88,6 +88,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_COPY_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_if.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_if.h
index 65be3c7..2b7dda9 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_if.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_replace_if.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -72,6 +72,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse.h
index e2a5d9a..801fccb 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -78,6 +78,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse_copy.h
index a84b1ad..c230399 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_reverse_copy.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -62,6 +62,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate.h
index 91ed402..99e6ca6 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -66,6 +66,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate_copy.h
index 52f403c..5b9321f 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_rotate_copy.h
@@ -23,7 +23,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -63,6 +63,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sample.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sample.h
index a37cb64..a5ff2d0 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sample.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sample.h
@@ -19,15 +19,15 @@
 #include <__random/uniform_random_bit_generator.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -69,6 +69,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SAMPLE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_search.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_search.h
index 388d5af..6d3e318 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_search.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_search.h
@@ -28,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -130,6 +130,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SEARCH_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_search_n.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_search_n.h
index 56ec8f3..ed5ec34 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_search_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_search_n.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -112,6 +112,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SEARCH_N_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_difference.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_difference.h
index 607dd68..6b9af87 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_difference.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_difference.h
@@ -30,7 +30,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -102,5 +102,5 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 #endif // _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_intersection.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_intersection.h
index aa9fd24..5848656 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_intersection.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_intersection.h
@@ -28,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -113,5 +113,5 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 #endif // _LIBCPP___ALGORITHM_RANGES_SET_INTERSECTION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_symmetric_difference.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_symmetric_difference.h
index bc4a906..f8bcf37 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_symmetric_difference.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_symmetric_difference.h
@@ -28,7 +28,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -113,5 +113,5 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 #endif // _LIBCPP___ALGORITHM_RANGES_SET_SYMMETRIC_DIFFERENCE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_union.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_union.h
index f8cd45c..bc669cc 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_union.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_set_union.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -116,6 +116,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_shuffle.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_shuffle.h
index a2f2c0e..2f45fb0 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_shuffle.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_shuffle.h
@@ -23,15 +23,15 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -66,6 +66,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort.h
index 32391df..60305b1 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -74,6 +74,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SORT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort_heap.h
index 9feb0f6..b40eef9 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_sort_heap.h
@@ -32,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -75,6 +75,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SORT_HEAP_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_partition.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_partition.h
index c3469f1..77bef85 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_partition.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_partition.h
@@ -26,15 +26,15 @@
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
 #include <__ranges/subrange.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -83,6 +83,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_sort.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_sort.h
index d3c48dd..b823e3b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_stable_sort.h
@@ -31,7 +31,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -74,6 +74,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_SORT_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_swap_ranges.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_swap_ranges.h
index 552fd55..34124db 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_swap_ranges.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_swap_ranges.h
@@ -24,7 +24,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -63,6 +63,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_transform.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_transform.h
index c0981a0..1bba756 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_transform.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_transform.h
@@ -26,7 +26,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -165,6 +165,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_TRANSFORM_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique.h
index be427cc..9e05c09 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique.h
@@ -32,7 +32,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -74,6 +74,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique_copy.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique_copy.h
index 3ad47b0..2aaa879 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique_copy.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_unique_copy.h
@@ -33,7 +33,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -111,6 +111,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/ranges_upper_bound.h b/third_party/llvm-project/libcxx/include/__algorithm/ranges_upper_bound.h
index a134080..43ce89b 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/ranges_upper_bound.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/ranges_upper_bound.h
@@ -25,7 +25,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -70,6 +70,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_UPPER_BOUND_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/rotate.h b/third_party/llvm-project/libcxx/include/__algorithm/rotate.h
index 8934ce0..7ed6f18 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/rotate.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/rotate.h
@@ -15,9 +15,9 @@
 #include <__algorithm/swap_ranges.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_trivially_move_assignable.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/sample.h b/third_party/llvm-project/libcxx/include/__algorithm/sample.h
index f403ba6..7a05e45 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/sample.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/sample.h
@@ -16,8 +16,8 @@
 #include <__iterator/distance.h>
 #include <__iterator/iterator_traits.h>
 #include <__random/uniform_int_distribution.h>
+#include <__type_traits/common_type.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -88,7 +88,7 @@
       __g, _PopIterCategory());
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _PopulationIterator, class _SampleIterator, class _Distance,
           class _UniformRandomNumberGenerator>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -103,7 +103,7 @@
       std::move(__first), std::move(__last), std::move(__output_iter), __n, __g);
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/search.h b/third_party/llvm-project/libcxx/include/__algorithm/search.h
index 93771be..c9012d7 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/search.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/search.h
@@ -14,12 +14,13 @@
 #include <__algorithm/iterator_operations.h>
 #include <__config>
 #include <__functional/identity.h>
+#include <__functional/invoke.h>
 #include <__iterator/advance.h>
 #include <__iterator/concepts.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/enable_if.h>
 #include <__type_traits/is_callable.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -187,7 +188,7 @@
   return std::search(__first1, __last1, __first2, __last2, __equal_to());
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _ForwardIterator, class _Searcher>
 _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
 search(_ForwardIterator __f, _ForwardIterator __l, const _Searcher& __s) {
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/search_n.h b/third_party/llvm-project/libcxx/include/__algorithm/search_n.h
index 60a0735..06962be 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/search_n.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/search_n.h
@@ -14,14 +14,15 @@
 #include <__algorithm/iterator_operations.h>
 #include <__config>
 #include <__functional/identity.h>
+#include <__functional/invoke.h>
 #include <__iterator/advance.h>
 #include <__iterator/concepts.h>
 #include <__iterator/distance.h>
 #include <__iterator/iterator_traits.h>
 #include <__ranges/concepts.h>
+#include <__type_traits/is_callable.h>
 #include <__utility/convert_to_integral.h>
 #include <__utility/pair.h>
-#include <type_traits>  // __convert_to_integral
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/set_difference.h b/third_party/llvm-project/libcxx/include/__algorithm/set_difference.h
index cffdc8f..5a7d3bc 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/set_difference.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/set_difference.h
@@ -17,9 +17,9 @@
 #include <__functional/identity.h>
 #include <__functional/invoke.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/shift_left.h b/third_party/llvm-project/libcxx/include/__algorithm/shift_left.h
index 33f06d5..403317e 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/shift_left.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/shift_left.h
@@ -12,7 +12,6 @@
 #include <__algorithm/move.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -20,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _ForwardIterator>
 inline _LIBCPP_INLINE_VISIBILITY constexpr
@@ -49,7 +48,7 @@
     return _VSTD::move(__m, __last, __first);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/shift_right.h b/third_party/llvm-project/libcxx/include/__algorithm/shift_right.h
index 14bc761..751e690 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/shift_right.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/shift_right.h
@@ -15,7 +15,6 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__utility/swap.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -23,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _ForwardIterator>
 inline _LIBCPP_INLINE_VISIBILITY constexpr
@@ -95,7 +94,7 @@
     }
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/sort.h b/third_party/llvm-project/libcxx/include/__algorithm/sort.h
index a7d2d55..f870612 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/sort.h
@@ -26,9 +26,8 @@
 #include <__functional/operations.h>
 #include <__functional/ranges_operations.h>
 #include <__iterator/iterator_traits.h>
-#include <__memory/destruct_n.h>
-#include <__memory/unique_ptr.h>
 #include <__type_traits/conditional.h>
+#include <__type_traits/disjunction.h>
 #include <__type_traits/is_arithmetic.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
@@ -41,52 +40,6 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-// Wraps an algorithm policy tag and a comparator in a single struct, used to pass the policy tag around without
-// changing the number of template arguments (to keep the ABI stable). This is only used for the "range" policy tag.
-//
-// To create an object of this type, use `_WrapAlgPolicy<T, C>::type` -- see the specialization below for the rationale.
-template <class _PolicyT, class _CompT, class = void>
-struct _WrapAlgPolicy {
-  using type = _WrapAlgPolicy;
-
-  using _AlgPolicy = _PolicyT;
-  using _Comp = _CompT;
-  _Comp& __comp;
-
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
-  _WrapAlgPolicy(_Comp& __c) : __comp(__c) {}
-};
-
-// Specialization for the "classic" policy tag that avoids creating a struct and simply defines an alias for the
-// comparator. When unwrapping, a pristine comparator is always considered to have the "classic" tag attached. Passing
-// the pristine comparator where possible allows using template instantiations from the dylib.
-template <class _PolicyT, class _CompT>
-struct _WrapAlgPolicy<_PolicyT, _CompT, __enable_if_t<std::is_same<_PolicyT, _ClassicAlgPolicy>::value> > {
-  using type = _CompT;
-};
-
-// Unwraps a pristine functor (e.g. `std::less`) as if it were wrapped using `_WrapAlgPolicy`. The policy tag is always
-// set to "classic".
-template <class _CompT>
-struct _UnwrapAlgPolicy {
-  using _AlgPolicy = _ClassicAlgPolicy;
-  using _Comp = _CompT;
-
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static
-  _Comp __get_comp(_Comp __comp) { return __comp; }
-};
-
-// Unwraps a `_WrapAlgPolicy` struct.
-template <class... _Ts>
-struct _UnwrapAlgPolicy<_WrapAlgPolicy<_Ts...> > {
-  using _Wrapped = _WrapAlgPolicy<_Ts...>;
-  using _AlgPolicy = typename _Wrapped::_AlgPolicy;
-  using _Comp = typename _Wrapped::_Comp;
-
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static
-  _Comp __get_comp(_Wrapped& __w) { return __w.__comp; }
-};
-
 // stable, 2-3 compares, 0-2 swaps
 
 template <class _AlgPolicy, class _Compare, class _ForwardIterator>
@@ -130,65 +83,41 @@
 
 template <class _AlgPolicy, class _Compare, class _ForwardIterator>
 _LIBCPP_HIDE_FROM_ABI
-unsigned __sort4(_ForwardIterator __x1, _ForwardIterator __x2, _ForwardIterator __x3, _ForwardIterator __x4,
+void __sort4(_ForwardIterator __x1, _ForwardIterator __x2, _ForwardIterator __x3, _ForwardIterator __x4,
                  _Compare __c) {
   using _Ops   = _IterOps<_AlgPolicy>;
-  unsigned __r = std::__sort3<_AlgPolicy, _Compare>(__x1, __x2, __x3, __c);
+  std::__sort3<_AlgPolicy, _Compare>(__x1, __x2, __x3, __c);
   if (__c(*__x4, *__x3)) {
     _Ops::iter_swap(__x3, __x4);
-    ++__r;
     if (__c(*__x3, *__x2)) {
       _Ops::iter_swap(__x2, __x3);
-      ++__r;
       if (__c(*__x2, *__x1)) {
         _Ops::iter_swap(__x1, __x2);
-        ++__r;
       }
     }
   }
-  return __r;
 }
 
 // stable, 4-10 compares, 0-9 swaps
 
-template <class _WrappedComp, class _ForwardIterator>
-_LIBCPP_HIDDEN unsigned __sort5(_ForwardIterator __x1, _ForwardIterator __x2, _ForwardIterator __x3,
-                                _ForwardIterator __x4, _ForwardIterator __x5, _WrappedComp __wrapped_comp) {
-  using _Unwrap = _UnwrapAlgPolicy<_WrappedComp>;
-  using _AlgPolicy = typename _Unwrap::_AlgPolicy;
+template <class _AlgPolicy, class _Comp, class _ForwardIterator>
+_LIBCPP_HIDE_FROM_ABI void __sort5(_ForwardIterator __x1, _ForwardIterator __x2, _ForwardIterator __x3,
+                                   _ForwardIterator __x4, _ForwardIterator __x5, _Comp __comp) {
   using _Ops = _IterOps<_AlgPolicy>;
 
-  using _Compare = typename _Unwrap::_Comp;
-  _Compare __c = _Unwrap::__get_comp(__wrapped_comp);
-
-  unsigned __r = std::__sort4<_AlgPolicy, _Compare>(__x1, __x2, __x3, __x4, __c);
-  if (__c(*__x5, *__x4)) {
+  std::__sort4<_AlgPolicy, _Comp>(__x1, __x2, __x3, __x4, __comp);
+  if (__comp(*__x5, *__x4)) {
     _Ops::iter_swap(__x4, __x5);
-    ++__r;
-    if (__c(*__x4, *__x3)) {
+    if (__comp(*__x4, *__x3)) {
       _Ops::iter_swap(__x3, __x4);
-      ++__r;
-      if (__c(*__x3, *__x2)) {
+      if (__comp(*__x3, *__x2)) {
         _Ops::iter_swap(__x2, __x3);
-        ++__r;
-        if (__c(*__x2, *__x1)) {
+        if (__comp(*__x2, *__x1)) {
           _Ops::iter_swap(__x1, __x2);
-          ++__r;
         }
       }
     }
   }
-  return __r;
-}
-
-template <class _AlgPolicy, class _Compare, class _ForwardIterator>
-_LIBCPP_HIDE_FROM_ABI unsigned __sort5_wrap_policy(
-    _ForwardIterator __x1, _ForwardIterator __x2, _ForwardIterator __x3, _ForwardIterator __x4, _ForwardIterator __x5,
-    _Compare __c) {
-  using _WrappedComp = typename _WrapAlgPolicy<_AlgPolicy, _Compare>::type;
-  _WrappedComp __wrapped_comp(__c);
-  return std::__sort5<_WrappedComp, _ForwardIterator>(
-      std::move(__x1), std::move(__x2), std::move(__x3), std::move(__x4), std::move(__x5), __wrapped_comp);
 }
 
 // The comparator being simple is a prerequisite for using the branchless optimization.
@@ -200,7 +129,7 @@
 struct __is_simple_comparator<less<_Tp>&> : true_type {};
 template <class _Tp>
 struct __is_simple_comparator<greater<_Tp>&> : true_type {};
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <>
 struct __is_simple_comparator<ranges::less&> : true_type {};
 template <>
@@ -299,7 +228,8 @@
 inline _LIBCPP_HIDE_FROM_ABI __enable_if_t<!__use_branchless_sort<_Compare, _RandomAccessIterator>::value, void>
 __sort5_maybe_branchless(_RandomAccessIterator __x1, _RandomAccessIterator __x2, _RandomAccessIterator __x3,
                          _RandomAccessIterator __x4, _RandomAccessIterator __x5, _Compare __c) {
-  std::__sort5_wrap_policy<_AlgPolicy, _Compare>(__x1, __x2, __x3, __x4, __x5, __c);
+  std::__sort5<_AlgPolicy, _Compare, _RandomAccessIterator>(
+      std::move(__x1), std::move(__x2), std::move(__x3), std::move(__x4), std::move(__x5), __c);
 }
 
 // Assumes size > 0
@@ -344,7 +274,7 @@
 
 // Sort the iterator range [__first, __last) using the comparator __comp using
 // the insertion sort algorithm.  Insertion sort has two loops, outer and inner.
-// The implementation below has not bounds check (unguarded) for the inner loop.
+// The implementation below has no bounds check (unguarded) for the inner loop.
 // Assumes that there is an element in the position (__first - 1) and that each
 // element in the input range is greater or equal to the element at __first - 1.
 template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
@@ -370,16 +300,11 @@
   }
 }
 
-template <class _WrappedComp, class _RandomAccessIterator>
-_LIBCPP_HIDDEN bool __insertion_sort_incomplete(
-    _RandomAccessIterator __first, _RandomAccessIterator __last, _WrappedComp __wrapped_comp) {
-  using _Unwrap = _UnwrapAlgPolicy<_WrappedComp>;
-  using _AlgPolicy = typename _Unwrap::_AlgPolicy;
+template <class _AlgPolicy, class _Comp, class _RandomAccessIterator>
+_LIBCPP_HIDE_FROM_ABI bool __insertion_sort_incomplete(
+    _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp) {
   using _Ops = _IterOps<_AlgPolicy>;
 
-  using _Compare = typename _Unwrap::_Comp;
-  _Compare __comp = _Unwrap::__get_comp(__wrapped_comp);
-
   typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
   switch (__last - __first) {
   case 0:
@@ -390,21 +315,21 @@
       _Ops::iter_swap(__first, __last);
     return true;
   case 3:
-    std::__sort3_maybe_branchless<_AlgPolicy, _Compare>(__first, __first + difference_type(1), --__last, __comp);
+    std::__sort3_maybe_branchless<_AlgPolicy, _Comp>(__first, __first + difference_type(1), --__last, __comp);
     return true;
   case 4:
-    std::__sort4_maybe_branchless<_AlgPolicy, _Compare>(
+    std::__sort4_maybe_branchless<_AlgPolicy, _Comp>(
         __first, __first + difference_type(1), __first + difference_type(2), --__last, __comp);
     return true;
   case 5:
-    std::__sort5_maybe_branchless<_AlgPolicy, _Compare>(
+    std::__sort5_maybe_branchless<_AlgPolicy, _Comp>(
         __first, __first + difference_type(1), __first + difference_type(2), __first + difference_type(3),
         --__last, __comp);
     return true;
   }
   typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type;
   _RandomAccessIterator __j = __first + difference_type(2);
-  std::__sort3_maybe_branchless<_AlgPolicy, _Compare>(__first, __first + difference_type(1), __j, __comp);
+  std::__sort3_maybe_branchless<_AlgPolicy, _Comp>(__first, __first + difference_type(1), __j, __comp);
   const unsigned __limit = 8;
   unsigned __count = 0;
   for (_RandomAccessIterator __i = __j + difference_type(1); __i != __last; ++__i) {
@@ -425,37 +350,6 @@
   return true;
 }
 
-template <class _AlgPolicy, class _Compare, class _BidirectionalIterator>
-_LIBCPP_HIDE_FROM_ABI
-void __insertion_sort_move(_BidirectionalIterator __first1, _BidirectionalIterator __last1,
-                           typename iterator_traits<_BidirectionalIterator>::value_type* __first2, _Compare __comp) {
-  using _Ops = _IterOps<_AlgPolicy>;
-
-  typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type;
-  if (__first1 != __last1) {
-    __destruct_n __d(0);
-    unique_ptr<value_type, __destruct_n&> __h(__first2, __d);
-    value_type* __last2 = __first2;
-    ::new ((void*)__last2) value_type(_Ops::__iter_move(__first1));
-    __d.template __incr<value_type>();
-    for (++__last2; ++__first1 != __last1; ++__last2) {
-      value_type* __j2 = __last2;
-      value_type* __i2 = __j2;
-      if (__comp(*__first1, *--__i2)) {
-        ::new ((void*)__j2) value_type(std::move(*__i2));
-        __d.template __incr<value_type>();
-        for (--__j2; __i2 != __first2 && __comp(*__first1, *--__i2); --__j2)
-          *__j2 = std::move(*__i2);
-        *__j2 = _Ops::__iter_move(__first1);
-      } else {
-        ::new ((void*)__j2) value_type(_Ops::__iter_move(__first1));
-        __d.template __incr<value_type>();
-      }
-    }
-    __h.release();
-  }
-}
-
 template <class _AlgPolicy, class _RandomAccessIterator>
 inline _LIBCPP_HIDE_FROM_ABI void __swap_bitmap_pos(
     _RandomAccessIterator __first, _RandomAccessIterator __last, uint64_t& __left_bitset, uint64_t& __right_bitset) {
@@ -464,11 +358,11 @@
   // Swap one pair on each iteration as long as both bitsets have at least one
   // element for swapping.
   while (__left_bitset != 0 && __right_bitset != 0) {
-    difference_type tz_left  = __libcpp_ctz(__left_bitset);
-    __left_bitset            = __libcpp_blsr(__left_bitset);
-    difference_type tz_right = __libcpp_ctz(__right_bitset);
-    __right_bitset           = __libcpp_blsr(__right_bitset);
-    _Ops::iter_swap(__first + tz_left, __last - tz_right);
+    difference_type __tz_left  = __libcpp_ctz(__left_bitset);
+    __left_bitset              = __libcpp_blsr(__left_bitset);
+    difference_type __tz_right = __libcpp_ctz(__right_bitset);
+    __right_bitset             = __libcpp_blsr(__right_bitset);
+    _Ops::iter_swap(__first + __tz_left, __last - __tz_right);
   }
 }
 
@@ -533,9 +427,9 @@
   // Record the comparison outcomes for the elements currently on the left side.
   if (__left_bitset == 0) {
     _RandomAccessIterator __iter = __first;
-    for (int j = 0; j < __l_size; j++) {
+    for (int __j = 0; __j < __l_size; __j++) {
       bool __comp_result = !__comp(*__iter, __pivot);
-      __left_bitset |= (static_cast<uint64_t>(__comp_result) << j);
+      __left_bitset |= (static_cast<uint64_t>(__comp_result) << __j);
       ++__iter;
     }
   }
@@ -543,9 +437,9 @@
   // side.
   if (__right_bitset == 0) {
     _RandomAccessIterator __iter = __lm1;
-    for (int j = 0; j < __r_size; j++) {
+    for (int __j = 0; __j < __r_size; __j++) {
       bool __comp_result = __comp(*__iter, __pivot);
-      __right_bitset |= (static_cast<uint64_t>(__comp_result) << j);
+      __right_bitset |= (static_cast<uint64_t>(__comp_result) << __j);
       --__iter;
     }
   }
@@ -565,9 +459,9 @@
     while (__left_bitset != 0) {
       difference_type __tz_left = __detail::__block_size - 1 - __libcpp_clz(__left_bitset);
       __left_bitset &= (static_cast<uint64_t>(1) << __tz_left) - 1;
-      _RandomAccessIterator it = __first + __tz_left;
-      if (it != __lm1) {
-        _Ops::iter_swap(it, __lm1);
+      _RandomAccessIterator __it = __first + __tz_left;
+      if (__it != __lm1) {
+        _Ops::iter_swap(__it, __lm1);
       }
       --__lm1;
     }
@@ -578,9 +472,9 @@
     while (__right_bitset != 0) {
       difference_type __tz_right = __detail::__block_size - 1 - __libcpp_clz(__right_bitset);
       __right_bitset &= (static_cast<uint64_t>(1) << __tz_right) - 1;
-      _RandomAccessIterator it = __lm1 - __tz_right;
-      if (it != __first) {
-        _Ops::iter_swap(it, __first);
+      _RandomAccessIterator __it = __lm1 - __tz_right;
+      if (__it != __first) {
+        _Ops::iter_swap(__it, __first);
       }
       ++__first;
     }
@@ -862,10 +756,8 @@
     // [__first, __i) < *__i and *__i <= [__i+1, __last)
     // If we were given a perfect partition, see if insertion sort is quick...
     if (__ret.second) {
-      using _WrappedComp = typename _WrapAlgPolicy<_AlgPolicy, _Compare>::type;
-      _WrappedComp __wrapped_comp(__comp);
-      bool __fs = std::__insertion_sort_incomplete<_WrappedComp>(__first, __i, __wrapped_comp);
-      if (std::__insertion_sort_incomplete<_WrappedComp>(__i + difference_type(1), __last, __wrapped_comp)) {
+      bool __fs = std::__insertion_sort_incomplete<_AlgPolicy, _Compare>(__first, __i, __comp);
+      if (std::__insertion_sort_incomplete<_AlgPolicy, _Compare>(__i + difference_type(1), __last, __comp)) {
         if (__fs)
           return;
         __last = __i;
@@ -904,30 +796,8 @@
   return __log2;
 }
 
-template <class _WrappedComp, class _RandomAccessIterator>
-_LIBCPP_HIDDEN void __sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _WrappedComp __wrapped_comp) {
-  typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
-  difference_type __depth_limit = 2 * std::__log2i(__last - __first);
-
-  using _Unwrap = _UnwrapAlgPolicy<_WrappedComp>;
-  using _AlgPolicy = typename _Unwrap::_AlgPolicy;
-  using _Compare = typename _Unwrap::_Comp;
-  _Compare __comp = _Unwrap::__get_comp(__wrapped_comp);
-  // Only use bitset partitioning for arithmetic types.  We should also check
-  // that the default comparator is in use so that we are sure that there are no
-  // branches in the comparator.
-  std::__introsort<_AlgPolicy,
-                   _Compare,
-                   _RandomAccessIterator,
-                   __use_branchless_sort<_Compare, _RandomAccessIterator>::value>(
-      __first, __last, __comp, __depth_limit);
-}
-
-template <class _Compare, class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY void __sort(_Tp** __first, _Tp** __last, __less<_Tp*>&) {
-  __less<uintptr_t> __comp;
-  std::__sort<__less<uintptr_t>&, uintptr_t*>((uintptr_t*)__first, (uintptr_t*)__last, __comp);
-}
+template <class _Comp, class _RandomAccessIterator>
+void __sort(_RandomAccessIterator, _RandomAccessIterator, _Comp);
 
 extern template _LIBCPP_FUNC_VIS void __sort<__less<char>&, char*>(char*, char*, __less<char>&);
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -947,40 +817,83 @@
 extern template _LIBCPP_FUNC_VIS void __sort<__less<double>&, double*>(double*, double*, __less<double>&);
 extern template _LIBCPP_FUNC_VIS void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
 
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<char>&, char*>(char*, char*, __less<char>&);
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
-#endif
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<short>&, short*>(short*, short*, __less<short>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<int>&, int*>(int*, int*, __less<int>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long>&, long*>(long*, long*, __less<long>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long long>&, long long*>(long long*, long long*, __less<long long>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<float>&, float*>(float*, float*, __less<float>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<double>&, double*>(double*, double*, __less<double>&);
-extern template _LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
+template <class _AlgPolicy, class _RandomAccessIterator, class _Comp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
+__sort_dispatch(_RandomAccessIterator __first, _RandomAccessIterator __last, _Comp& __comp) {
+  typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
+  difference_type __depth_limit = 2 * std::__log2i(__last - __first);
 
-extern template _LIBCPP_FUNC_VIS unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&);
+  // Only use bitset partitioning for arithmetic types.  We should also check
+  // that the default comparator is in use so that we are sure that there are no
+  // branches in the comparator.
+  std::__introsort<_AlgPolicy,
+                   _Comp&,
+                   _RandomAccessIterator,
+                   __use_branchless_sort<_Comp, _RandomAccessIterator>::value>(
+      __first, __last, __comp, __depth_limit);
+}
+
+template <class _Type, class... _Options>
+using __is_any_of = _Or<is_same<_Type, _Options>...>;
+
+template <class _Type>
+using __sort_is_specialized_in_library = __is_any_of<
+    _Type,
+    char,
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+    wchar_t,
+#endif
+    signed char,
+    unsigned char,
+    short,
+    unsigned short,
+    int,
+    unsigned int,
+    long,
+    unsigned long,
+    long long,
+    unsigned long long,
+    float,
+    double,
+    long double>;
+
+template <class _AlgPolicy, class _Type, __enable_if_t<__sort_is_specialized_in_library<_Type>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void __sort_dispatch(_Type* __first, _Type* __last, __less<_Type>& __comp) {
+  std::__sort<__less<_Type>&, _Type*>(__first, __last, __comp);
+}
+
+template <class _AlgPolicy, class _Type, __enable_if_t<__sort_is_specialized_in_library<_Type>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void __sort_dispatch(_Type* __first, _Type* __last, less<_Type>&) {
+  __less<_Type> __comp;
+  std::__sort<__less<_Type>&, _Type*>(__first, __last, __comp);
+}
+
+#if _LIBCPP_STD_VER >= 14
+template <class _AlgPolicy, class _Type, __enable_if_t<__sort_is_specialized_in_library<_Type>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void __sort_dispatch(_Type* __first, _Type* __last, less<>&) {
+  __less<_Type> __comp;
+  std::__sort<__less<_Type>&, _Type*>(__first, __last, __comp);
+}
+#endif
+
+#if _LIBCPP_STD_VER >= 20
+template <class _AlgPolicy, class _Type, __enable_if_t<__sort_is_specialized_in_library<_Type>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void __sort_dispatch(_Type* __first, _Type* __last, ranges::less&) {
+  __less<_Type> __comp;
+  std::__sort<__less<_Type>&, _Type*>(__first, __last, __comp);
+}
+#endif
 
 template <class _AlgPolicy, class _RandomAccessIterator, class _Comp>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 void __sort_impl(_RandomAccessIterator __first, _RandomAccessIterator __last, _Comp& __comp) {
   std::__debug_randomize_range<_AlgPolicy>(__first, __last);
 
-  using _Comp_ref = __comp_ref_type<_Comp>;
   if (__libcpp_is_constant_evaluated()) {
-    std::__partial_sort<_AlgPolicy>(__first, __last, __last, __comp);
-
+    std::__partial_sort<_AlgPolicy>(
+        std::__unwrap_iter(__first), std::__unwrap_iter(__last), std::__unwrap_iter(__last), __comp);
   } else {
-    using _WrappedComp = typename _WrapAlgPolicy<_AlgPolicy, _Comp_ref>::type;
-    _Comp_ref __comp_ref(__comp);
-    _WrappedComp __wrapped_comp(__comp_ref);
-    std::__sort<_WrappedComp>(std::__unwrap_iter(__first), std::__unwrap_iter(__last), __wrapped_comp);
+    std::__sort_dispatch<_AlgPolicy>(std::__unwrap_iter(__first), std::__unwrap_iter(__last), __comp);
   }
 }
 
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/sort_heap.h b/third_party/llvm-project/libcxx/include/__algorithm/sort_heap.h
index 8249407..0dc9acc 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/sort_heap.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/sort_heap.h
@@ -15,8 +15,9 @@
 #include <__algorithm/pop_heap.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_copy_assignable.h>
+#include <__type_traits/is_copy_constructible.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/stable_partition.h b/third_party/llvm-project/libcxx/include/__algorithm/stable_partition.h
index a49de6d..3b68bd3 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/stable_partition.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/stable_partition.h
@@ -21,7 +21,6 @@
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <new>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/stable_sort.h b/third_party/llvm-project/libcxx/include/__algorithm/stable_sort.h
index 8e70978..0c9daa2 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/stable_sort.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/stable_sort.h
@@ -19,10 +19,10 @@
 #include <__memory/destruct_n.h>
 #include <__memory/temporary_buffer.h>
 #include <__memory/unique_ptr.h>
+#include <__type_traits/is_trivially_copy_assignable.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <new>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -30,6 +30,37 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+template <class _AlgPolicy, class _Compare, class _BidirectionalIterator>
+_LIBCPP_HIDE_FROM_ABI
+void __insertion_sort_move(_BidirectionalIterator __first1, _BidirectionalIterator __last1,
+                           typename iterator_traits<_BidirectionalIterator>::value_type* __first2, _Compare __comp) {
+  using _Ops = _IterOps<_AlgPolicy>;
+
+  typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type;
+  if (__first1 != __last1) {
+    __destruct_n __d(0);
+    unique_ptr<value_type, __destruct_n&> __h(__first2, __d);
+    value_type* __last2 = __first2;
+    ::new ((void*)__last2) value_type(_Ops::__iter_move(__first1));
+    __d.template __incr<value_type>();
+    for (++__last2; ++__first1 != __last1; ++__last2) {
+      value_type* __j2 = __last2;
+      value_type* __i2 = __j2;
+      if (__comp(*__first1, *--__i2)) {
+        ::new ((void*)__j2) value_type(std::move(*__i2));
+        __d.template __incr<value_type>();
+        for (--__j2; __i2 != __first2 && __comp(*__first1, *--__i2); --__j2)
+          *__j2 = std::move(*__i2);
+        *__j2 = _Ops::__iter_move(__first1);
+      } else {
+        ::new ((void*)__j2) value_type(_Ops::__iter_move(__first1));
+        __d.template __incr<value_type>();
+      }
+    }
+    __h.release();
+  }
+}
+
 template <class _AlgPolicy, class _Compare, class _InputIterator1, class _InputIterator2>
 _LIBCPP_HIDE_FROM_ABI void
 __merge_move_construct(_InputIterator1 __first1, _InputIterator1 __last1,
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/three_way_comp_ref_type.h b/third_party/llvm-project/libcxx/include/__algorithm/three_way_comp_ref_type.h
new file mode 100644
index 0000000..10396e0
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__algorithm/three_way_comp_ref_type.h
@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
+#define _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
+
+#include <__compare/ordering.h>
+#include <__config>
+#include <__debug>
+#include <__utility/declval.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 20
+
+template <class _Comp>
+struct __debug_three_way_comp {
+  _Comp& __comp_;
+  _LIBCPP_HIDE_FROM_ABI constexpr __debug_three_way_comp(_Comp& __c) : __comp_(__c) {}
+
+  template <class _Tp, class _Up>
+  _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp& __x, _Up& __y) {
+    auto __r = __comp_(__x, __y);
+    __do_compare_assert(0, __y, __x, __r);
+    return __r;
+  }
+
+  template <class _LHS, class _RHS, class _Order>
+  _LIBCPP_HIDE_FROM_ABI constexpr inline void __do_compare_assert(int, _LHS& __l, _RHS& __r, _Order __o)
+    requires __comparison_category<decltype(std::declval<_Comp&>()(std::declval<_LHS&>(), std::declval<_RHS&>()))>
+  {
+    _Order __expected = __o;
+    if (__o == _Order::less)
+      __expected = _Order::greater;
+    if (__o == _Order::greater)
+      __expected = _Order::less;
+    _LIBCPP_DEBUG_ASSERT(__comp_(__l, __r) == __expected, "Comparator does not induce a strict weak ordering");
+    (void)__l;
+    (void)__r;
+    (void)__expected;
+  }
+
+  template <class _LHS, class _RHS, class _Order>
+  _LIBCPP_HIDE_FROM_ABI constexpr inline void __do_compare_assert(long, _LHS&, _RHS&, _Order) {}
+};
+
+// Pass the comparator by lvalue reference. Or in debug mode, using a
+// debugging wrapper that stores a reference.
+#  ifndef _LIBCPP_ENABLE_DEBUG_MODE
+template <class _Comp>
+using __three_way_comp_ref_type = __debug_three_way_comp<_Comp>;
+#  else
+template <class _Comp>
+using __three_way_comp_ref_type = _Comp&;
+#  endif
+
+#endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/uniform_random_bit_generator_adaptor.h b/third_party/llvm-project/libcxx/include/__algorithm/uniform_random_bit_generator_adaptor.h
index 1e86074..1f20399 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/uniform_random_bit_generator_adaptor.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/uniform_random_bit_generator_adaptor.h
@@ -11,13 +11,13 @@
 
 #include <__config>
 #include <__functional/invoke.h>
-#include <type_traits>
+#include <__type_traits/remove_cvref.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
@@ -57,6 +57,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___ALGORITHM_RANGES_UNIFORM_RANDOM_BIT_GENERATOR_ADAPTOR_H
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/unwrap_iter.h b/third_party/llvm-project/libcxx/include/__algorithm/unwrap_iter.h
index 0f661e1..81f2942 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/unwrap_iter.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/unwrap_iter.h
@@ -64,6 +64,14 @@
   return _Impl::__unwrap(__i);
 }
 
+// Allow input_iterators to be passed to __unwrap_iter (but not __rewrap_iter)
+#if _LIBCPP_STD_VER >= 20
+template <class _Iter, __enable_if_t<!is_copy_constructible<_Iter>::value, int> = 0>
+inline _LIBCPP_HIDE_FROM_ABI constexpr _Iter __unwrap_iter(_Iter __i) noexcept {
+  return __i;
+}
+#endif
+
 template <class _OrigIter, class _Iter, class _Impl = __unwrap_iter_impl<_OrigIter> >
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _OrigIter __rewrap_iter(_OrigIter __orig_iter, _Iter __iter) _NOEXCEPT {
   return _Impl::__rewrap(std::move(__orig_iter), std::move(__iter));
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/unwrap_range.h b/third_party/llvm-project/libcxx/include/__algorithm/unwrap_range.h
index 2c5d23e..2c75c8f 100644
--- a/third_party/llvm-project/libcxx/include/__algorithm/unwrap_range.h
+++ b/third_party/llvm-project/libcxx/include/__algorithm/unwrap_range.h
@@ -28,7 +28,7 @@
 // __unwrap_iter and __rewrap_iter don't work for this, because they assume that the iterator and sentinel have
 // the same type. __unwrap_range tries to get two iterators and then forward to __unwrap_iter.
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Iter, class _Sent>
 struct __unwrap_range_impl {
   _LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __sent)
@@ -43,7 +43,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI static constexpr auto
-  __rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter)
+  __rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(std::move(__orig_iter))) __iter)
     requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
   {
     return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
@@ -80,7 +80,7 @@
 _LIBCPP_HIDE_FROM_ABI constexpr _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
   return __unwrap_range_impl<_Iter, _Sent>::__rewrap(std::move(__orig_iter), std::move(__iter));
 }
-#else  // _LIBCPP_STD_VER > 17
+#else  // _LIBCPP_STD_VER >= 20
 template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR pair<_Unwrapped, _Unwrapped> __unwrap_range(_Iter __first, _Iter __last) {
   return std::make_pair(std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last)));
@@ -90,7 +90,7 @@
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
   return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__assert b/third_party/llvm-project/libcxx/include/__assert
index 9c0cd1b..e20ee50 100644
--- a/third_party/llvm-project/libcxx/include/__assert
+++ b/third_party/llvm-project/libcxx/include/__assert
@@ -17,39 +17,33 @@
 #  pragma GCC system_header
 #endif
 
-// TODO: Remove in LLVM 17.
-#if defined(_LIBCPP_DEBUG)
-#   error "Defining _LIBCPP_DEBUG is not supported anymore. Please use _LIBCPP_ENABLE_DEBUG_MODE instead."
-#endif
-
 // Automatically enable assertions when the debug mode is enabled.
 #if defined(_LIBCPP_ENABLE_DEBUG_MODE)
-# ifndef _LIBCPP_ENABLE_ASSERTIONS
-#   define _LIBCPP_ENABLE_ASSERTIONS 1
-# endif
+#  ifndef _LIBCPP_ENABLE_ASSERTIONS
+#    define _LIBCPP_ENABLE_ASSERTIONS 1
+#  endif
 #endif
 
 #ifndef _LIBCPP_ENABLE_ASSERTIONS
-# define _LIBCPP_ENABLE_ASSERTIONS _LIBCPP_ENABLE_ASSERTIONS_DEFAULT
+#  define _LIBCPP_ENABLE_ASSERTIONS _LIBCPP_ENABLE_ASSERTIONS_DEFAULT
 #endif
 
 #if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1
-# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"
+#  error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"
 #endif
 
 #if _LIBCPP_ENABLE_ASSERTIONS
-# define _LIBCPP_ASSERT(expression, message)                                        \
-    (__builtin_expect(static_cast<bool>(expression), 1) ?                           \
-      (void)0 :                                                                     \
-      _LIBCPP_VERBOSE_ABORT("%s:%d: assertion %s failed: %s", __FILE__, __LINE__, #expression, message))
+#  define _LIBCPP_ASSERT(expression, message)                                                                          \
+    (__builtin_expect(static_cast<bool>(expression), 1)                                                                \
+         ? (void)0                                                                                                     \
+         : _LIBCPP_VERBOSE_ABORT(                                                                                      \
+               "%s:%d: assertion %s failed: %s", __builtin_FILE(), __builtin_LINE(), #expression, message))
 #elif !defined(_LIBCPP_ASSERTIONS_DISABLE_ASSUME) && __has_builtin(__builtin_assume)
-# define _LIBCPP_ASSERT(expression, message)                                        \
-    (_LIBCPP_DIAGNOSTIC_PUSH                                                        \
-    _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wassume")                                    \
-    __builtin_assume(static_cast<bool>(expression))                                 \
-    _LIBCPP_DIAGNOSTIC_POP)
+#  define _LIBCPP_ASSERT(expression, message)                                                                          \
+    (_LIBCPP_DIAGNOSTIC_PUSH _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wassume")                                              \
+         __builtin_assume(static_cast<bool>(expression)) _LIBCPP_DIAGNOSTIC_POP)
 #else
-# define _LIBCPP_ASSERT(expression, message) ((void)0)
+#  define _LIBCPP_ASSERT(expression, message) ((void)0)
 #endif
 
 #endif // _LIBCPP___ASSERT
diff --git a/third_party/llvm-project/libcxx/include/__atomic/aliases.h b/third_party/llvm-project/libcxx/include/__atomic/aliases.h
new file mode 100644
index 0000000..806589b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/aliases.h
@@ -0,0 +1,116 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ALIASES_H
+#define _LIBCPP___ATOMIC_ALIASES_H
+
+#include <__atomic/atomic.h>
+#include <__atomic/atomic_lock_free.h>
+#include <__atomic/contention_t.h>
+#include <__atomic/is_always_lock_free.h>
+#include <__config>
+#include <__type_traits/conditional.h>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+using atomic_bool   = atomic<bool>;
+using atomic_char   = atomic<char>;
+using atomic_schar  = atomic<signed char>;
+using atomic_uchar  = atomic<unsigned char>;
+using atomic_short  = atomic<short>;
+using atomic_ushort = atomic<unsigned short>;
+using atomic_int    = atomic<int>;
+using atomic_uint   = atomic<unsigned int>;
+using atomic_long   = atomic<long>;
+using atomic_ulong  = atomic<unsigned long>;
+using atomic_llong  = atomic<long long>;
+using atomic_ullong = atomic<unsigned long long>;
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+using atomic_char8_t = atomic<char8_t>;
+#endif
+using atomic_char16_t = atomic<char16_t>;
+using atomic_char32_t = atomic<char32_t>;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+using atomic_wchar_t = atomic<wchar_t>;
+#endif
+
+using atomic_int_least8_t   = atomic<int_least8_t>;
+using atomic_uint_least8_t  = atomic<uint_least8_t>;
+using atomic_int_least16_t  = atomic<int_least16_t>;
+using atomic_uint_least16_t = atomic<uint_least16_t>;
+using atomic_int_least32_t  = atomic<int_least32_t>;
+using atomic_uint_least32_t = atomic<uint_least32_t>;
+using atomic_int_least64_t  = atomic<int_least64_t>;
+using atomic_uint_least64_t = atomic<uint_least64_t>;
+
+using atomic_int_fast8_t   = atomic<int_fast8_t>;
+using atomic_uint_fast8_t  = atomic<uint_fast8_t>;
+using atomic_int_fast16_t  = atomic<int_fast16_t>;
+using atomic_uint_fast16_t = atomic<uint_fast16_t>;
+using atomic_int_fast32_t  = atomic<int_fast32_t>;
+using atomic_uint_fast32_t = atomic<uint_fast32_t>;
+using atomic_int_fast64_t  = atomic<int_fast64_t>;
+using atomic_uint_fast64_t = atomic<uint_fast64_t>;
+
+using atomic_int8_t   = atomic< int8_t>;
+using atomic_uint8_t  = atomic<uint8_t>;
+using atomic_int16_t  = atomic< int16_t>;
+using atomic_uint16_t = atomic<uint16_t>;
+using atomic_int32_t  = atomic< int32_t>;
+using atomic_uint32_t = atomic<uint32_t>;
+using atomic_int64_t  = atomic< int64_t>;
+using atomic_uint64_t = atomic<uint64_t>;
+
+using atomic_intptr_t  = atomic<intptr_t>;
+using atomic_uintptr_t = atomic<uintptr_t>;
+using atomic_size_t    = atomic<size_t>;
+using atomic_ptrdiff_t = atomic<ptrdiff_t>;
+using atomic_intmax_t  = atomic<intmax_t>;
+using atomic_uintmax_t = atomic<uintmax_t>;
+
+// atomic_*_lock_free : prefer the contention type most highly, then the largest lock-free type
+
+#ifdef __cpp_lib_atomic_is_always_lock_free
+#  define _LIBCPP_CONTENTION_LOCK_FREE ::std::__libcpp_is_always_lock_free<__cxx_contention_t>::__value
+#else
+#  define _LIBCPP_CONTENTION_LOCK_FREE false
+#endif
+
+#if ATOMIC_LLONG_LOCK_FREE == 2
+using __libcpp_signed_lock_free = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, long long>;
+using __libcpp_unsigned_lock_free =
+    __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned long long>;
+#elif ATOMIC_INT_LOCK_FREE == 2
+using __libcpp_signed_lock_free   = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, int>;
+using __libcpp_unsigned_lock_free = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned int>;
+#elif ATOMIC_SHORT_LOCK_FREE == 2
+using __libcpp_signed_lock_free   = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, short>;
+using __libcpp_unsigned_lock_free = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned short>;
+#elif ATOMIC_CHAR_LOCK_FREE == 2
+using __libcpp_signed_lock_free   = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, char>;
+using __libcpp_unsigned_lock_free = __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned char>;
+#else
+// No signed/unsigned lock-free types
+#  define _LIBCPP_NO_LOCK_FREE_TYPES
+#endif
+
+#if !defined(_LIBCPP_NO_LOCK_FREE_TYPES)
+using atomic_signed_lock_free   = atomic<__libcpp_signed_lock_free>;
+using atomic_unsigned_lock_free = atomic<__libcpp_unsigned_lock_free>;
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_ALIASES_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic.h b/third_party/llvm-project/libcxx/include/__atomic/atomic.h
new file mode 100644
index 0000000..68df7f1
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic.h
@@ -0,0 +1,664 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_H
+#define _LIBCPP___ATOMIC_ATOMIC_H
+
+#include <__atomic/atomic_base.h>
+#include <__atomic/check_memory_order.h>
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/memory_order.h>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_pointer.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+struct atomic
+    : public __atomic_base<_Tp>
+{
+  using __base          = __atomic_base<_Tp>;
+  using value_type      = _Tp;
+  using difference_type = value_type;
+
+#if _LIBCPP_STD_VER >= 20
+    _LIBCPP_HIDE_FROM_ABI
+    atomic() = default;
+#else
+    _LIBCPP_HIDE_FROM_ABI
+    atomic() _NOEXCEPT = default;
+#endif
+
+    _LIBCPP_HIDE_FROM_ABI
+    _LIBCPP_CONSTEXPR atomic(_Tp __d) _NOEXCEPT : __base(__d) {}
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator=(_Tp __d) volatile _NOEXCEPT
+        {__base::store(__d); return __d;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator=(_Tp __d) _NOEXCEPT
+        {__base::store(__d); return __d;}
+
+    atomic& operator=(const atomic&) = delete;
+    atomic& operator=(const atomic&) volatile = delete;
+};
+
+// atomic<T*>
+
+template <class _Tp>
+struct atomic<_Tp*>
+    : public __atomic_base<_Tp*>
+{
+    using __base          = __atomic_base<_Tp*>;
+    using value_type      = _Tp*;
+    using difference_type = ptrdiff_t;
+
+    _LIBCPP_HIDE_FROM_ABI
+    atomic() _NOEXCEPT = default;
+
+    _LIBCPP_HIDE_FROM_ABI
+    _LIBCPP_CONSTEXPR atomic(_Tp* __d) _NOEXCEPT : __base(__d) {}
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator=(_Tp* __d) volatile _NOEXCEPT
+        {__base::store(__d); return __d;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator=(_Tp* __d) _NOEXCEPT
+        {__base::store(__d); return __d;}
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+        // __atomic_fetch_add accepts function pointers, guard against them.
+        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
+        return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+        // __atomic_fetch_add accepts function pointers, guard against them.
+        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
+        return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+        // __atomic_fetch_add accepts function pointers, guard against them.
+        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
+        return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+        // __atomic_fetch_add accepts function pointers, guard against them.
+        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
+        return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator++(int) volatile _NOEXCEPT            {return fetch_add(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator++(int) _NOEXCEPT                     {return fetch_add(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator--(int) volatile _NOEXCEPT            {return fetch_sub(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator--(int) _NOEXCEPT                     {return fetch_sub(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator++() volatile _NOEXCEPT               {return fetch_add(1) + 1;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator++() _NOEXCEPT                        {return fetch_add(1) + 1;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator--() volatile _NOEXCEPT               {return fetch_sub(1) - 1;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator--() _NOEXCEPT                        {return fetch_sub(1) - 1;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator+=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator+=(ptrdiff_t __op) _NOEXCEPT          {return fetch_add(__op) + __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator-=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp* operator-=(ptrdiff_t __op) _NOEXCEPT          {return fetch_sub(__op) - __op;}
+
+    atomic& operator=(const atomic&) = delete;
+    atomic& operator=(const atomic&) volatile = delete;
+};
+
+// atomic_is_lock_free
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_is_lock_free(const volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    return __o->is_lock_free();
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_is_lock_free(const atomic<_Tp>* __o) _NOEXCEPT
+{
+    return __o->is_lock_free();
+}
+
+// atomic_init
+
+template <class _Tp>
+_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI
+void
+atomic_init(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
+}
+
+template <class _Tp>
+_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI
+void
+atomic_init(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
+}
+
+// atomic_store
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void
+atomic_store(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    __o->store(__d);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void
+atomic_store(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    __o->store(__d);
+}
+
+// atomic_store_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void
+atomic_store_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
+{
+    __o->store(__d, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void
+atomic_store_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
+{
+    __o->store(__d, __m);
+}
+
+// atomic_load
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_load(const volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    return __o->load();
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_load(const atomic<_Tp>* __o) _NOEXCEPT
+{
+    return __o->load();
+}
+
+// atomic_load_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_load_explicit(const volatile atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->load(__m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_load_explicit(const atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->load(__m);
+}
+
+// atomic_exchange
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_exchange(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->exchange(__d);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_exchange(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->exchange(__d);
+}
+
+// atomic_exchange_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_exchange_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
+{
+    return __o->exchange(__d, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_exchange_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
+{
+    return __o->exchange(__d, __m);
+}
+
+// atomic_compare_exchange_weak
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_weak(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->compare_exchange_weak(*__e, __d);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_weak(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->compare_exchange_weak(*__e, __d);
+}
+
+// atomic_compare_exchange_strong
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_strong(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->compare_exchange_strong(*__e, __d);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_strong(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
+{
+    return __o->compare_exchange_strong(*__e, __d);
+}
+
+// atomic_compare_exchange_weak_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_weak_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e,
+                                      typename atomic<_Tp>::value_type __d,
+                                      memory_order __s, memory_order __f) _NOEXCEPT
+  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
+{
+    return __o->compare_exchange_weak(*__e, __d, __s, __f);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_weak_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d,
+                                      memory_order __s, memory_order __f) _NOEXCEPT
+  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
+{
+    return __o->compare_exchange_weak(*__e, __d, __s, __f);
+}
+
+// atomic_compare_exchange_strong_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_strong_explicit(volatile atomic<_Tp>* __o,
+                                        typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d,
+                                        memory_order __s, memory_order __f) _NOEXCEPT
+  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
+{
+    return __o->compare_exchange_strong(*__e, __d, __s, __f);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool
+atomic_compare_exchange_strong_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e,
+                                        typename atomic<_Tp>::value_type __d,
+                                        memory_order __s, memory_order __f) _NOEXCEPT
+  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
+{
+    return __o->compare_exchange_strong(*__e, __d, __s, __f);
+}
+
+// atomic_wait
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_wait(const volatile atomic<_Tp>* __o,
+                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
+{
+    return __o->wait(__v);
+}
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_wait(const atomic<_Tp>* __o,
+                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
+{
+    return __o->wait(__v);
+}
+
+// atomic_wait_explicit
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_wait_explicit(const volatile atomic<_Tp>* __o,
+                          typename atomic<_Tp>::value_type __v,
+                          memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->wait(__v, __m);
+}
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_wait_explicit(const atomic<_Tp>* __o,
+                          typename atomic<_Tp>::value_type __v,
+                          memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->wait(__v, __m);
+}
+
+// atomic_notify_one
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_notify_one(volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_notify_one(atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+// atomic_notify_all
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_notify_all(volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+void atomic_notify_all(atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
+// atomic_fetch_add
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_fetch_add(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
+{
+    return __o->fetch_add(__op);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp
+atomic_fetch_add(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
+{
+    return __o->fetch_add(__op);
+}
+
+// atomic_fetch_add_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_add_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_add(__op, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_add_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_add(__op, __m);
+}
+
+// atomic_fetch_sub
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_sub(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
+{
+    return __o->fetch_sub(__op);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_sub(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
+{
+    return __o->fetch_sub(__op);
+}
+
+// atomic_fetch_sub_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_sub_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_sub(__op, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp atomic_fetch_sub_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_sub(__op, __m);
+}
+
+// atomic_fetch_and
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_and(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_and(__op);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_and(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_and(__op);
+}
+
+// atomic_fetch_and_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_and_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_and(__op, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_and_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_and(__op, __m);
+}
+
+// atomic_fetch_or
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_or(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_or(__op);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_or(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_or(__op);
+}
+
+// atomic_fetch_or_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_or_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_or(__op, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_or_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_or(__op, __m);
+}
+
+// atomic_fetch_xor
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_xor(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_xor(__op);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_xor(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
+{
+    return __o->fetch_xor(__op);
+}
+
+// atomic_fetch_xor_explicit
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_xor_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_xor(__op, __m);
+}
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+typename enable_if
+<
+    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
+    _Tp
+>::type
+atomic_fetch_xor_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
+{
+    return __o->fetch_xor(__op, __m);
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic_base.h b/third_party/llvm-project/libcxx/include/__atomic/atomic_base.h
new file mode 100644
index 0000000..7a9ba78
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic_base.h
@@ -0,0 +1,232 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_BASE_H
+#define _LIBCPP___ATOMIC_ATOMIC_BASE_H
+
+#include <__atomic/atomic_sync.h>
+#include <__atomic/check_memory_order.h>
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/is_always_lock_free.h>
+#include <__atomic/memory_order.h>
+#include <__availability>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__type_traits/is_integral.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_same.h>
+#include <version>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
+struct __atomic_base  // false
+{
+    mutable __cxx_atomic_impl<_Tp> __a_;
+
+#if defined(__cpp_lib_atomic_is_always_lock_free)
+  static _LIBCPP_CONSTEXPR bool is_always_lock_free = __libcpp_is_always_lock_free<__cxx_atomic_impl<_Tp> >::__value;
+#endif
+
+    _LIBCPP_HIDE_FROM_ABI
+    bool is_lock_free() const volatile _NOEXCEPT
+        {return __cxx_atomic_is_lock_free(sizeof(_Tp));}
+    _LIBCPP_HIDE_FROM_ABI
+    bool is_lock_free() const _NOEXCEPT
+        {return static_cast<__atomic_base const volatile*>(this)->is_lock_free();}
+    _LIBCPP_HIDE_FROM_ABI void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
+        _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
+      std::__cxx_atomic_store(std::addressof(__a_), __d, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI void store(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
+        _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
+      std::__cxx_atomic_store(std::addressof(__a_), __d, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp load(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
+      return std::__cxx_atomic_load(std::addressof(__a_), __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp load(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
+      return std::__cxx_atomic_load(std::addressof(__a_), __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI
+    operator _Tp() const volatile _NOEXCEPT {return load();}
+    _LIBCPP_HIDE_FROM_ABI
+    operator _Tp() const _NOEXCEPT          {return load();}
+    _LIBCPP_HIDE_FROM_ABI _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_exchange(std::addressof(__a_), __d, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_exchange(std::addressof(__a_), __d, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) volatile _NOEXCEPT
+        _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
+      return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) _NOEXCEPT
+        _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
+      return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) volatile _NOEXCEPT
+        _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
+      return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) _NOEXCEPT
+        _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
+      return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI bool
+    compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
+    }
+
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const
+        volatile _NOEXCEPT {
+      std::__cxx_atomic_wait(std::addressof(__a_), __v, __m);
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
+    wait(_Tp __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT {
+      std::__cxx_atomic_wait(std::addressof(__a_), __v, __m);
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_one() volatile _NOEXCEPT {
+      std::__cxx_atomic_notify_one(std::addressof(__a_));
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_one() _NOEXCEPT {
+      std::__cxx_atomic_notify_one(std::addressof(__a_));
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_all() volatile _NOEXCEPT {
+      std::__cxx_atomic_notify_all(std::addressof(__a_));
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_all() _NOEXCEPT {
+      std::__cxx_atomic_notify_all(std::addressof(__a_));
+    }
+
+#if _LIBCPP_STD_VER >= 20
+    _LIBCPP_HIDE_FROM_ABI constexpr
+    __atomic_base() noexcept(is_nothrow_default_constructible_v<_Tp>) : __a_(_Tp()) {}
+#else
+    _LIBCPP_HIDE_FROM_ABI
+    __atomic_base() _NOEXCEPT = default;
+#endif
+
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
+    __atomic_base(_Tp __d) _NOEXCEPT : __a_(__d) {}
+
+    __atomic_base(const __atomic_base&) = delete;
+};
+
+#if defined(__cpp_lib_atomic_is_always_lock_free)
+template <class _Tp, bool __b>
+_LIBCPP_CONSTEXPR bool __atomic_base<_Tp, __b>::is_always_lock_free;
+#endif
+
+// atomic<Integral>
+
+template <class _Tp>
+struct __atomic_base<_Tp, true>
+    : public __atomic_base<_Tp, false>
+{
+    using __base = __atomic_base<_Tp, false>;
+
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+    __atomic_base() _NOEXCEPT = default;
+
+    _LIBCPP_HIDE_FROM_ABI
+    _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __base(__d) {}
+
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_fetch_and(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_fetch_and(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_fetch_or(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_fetch_or(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
+      return std::__cxx_atomic_fetch_xor(std::addressof(this->__a_), __op, __m);
+    }
+    _LIBCPP_HIDE_FROM_ABI _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
+      return std::__cxx_atomic_fetch_xor(std::addressof(this->__a_), __op, __m);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator++(int) volatile _NOEXCEPT      {return fetch_add(_Tp(1));}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator++(int) _NOEXCEPT               {return fetch_add(_Tp(1));}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator--(int) volatile _NOEXCEPT      {return fetch_sub(_Tp(1));}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator--(int) _NOEXCEPT               {return fetch_sub(_Tp(1));}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator++() volatile _NOEXCEPT         {return fetch_add(_Tp(1)) + _Tp(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator++() _NOEXCEPT                  {return fetch_add(_Tp(1)) + _Tp(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator--() volatile _NOEXCEPT         {return fetch_sub(_Tp(1)) - _Tp(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator--() _NOEXCEPT                  {return fetch_sub(_Tp(1)) - _Tp(1);}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator+=(_Tp __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator+=(_Tp __op) _NOEXCEPT          {return fetch_add(__op) + __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator-=(_Tp __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator-=(_Tp __op) _NOEXCEPT          {return fetch_sub(__op) - __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator&=(_Tp __op) volatile _NOEXCEPT {return fetch_and(__op) & __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator&=(_Tp __op) _NOEXCEPT          {return fetch_and(__op) & __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator|=(_Tp __op) volatile _NOEXCEPT {return fetch_or(__op) | __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator|=(_Tp __op) _NOEXCEPT          {return fetch_or(__op) | __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator^=(_Tp __op) volatile _NOEXCEPT {return fetch_xor(__op) ^ __op;}
+    _LIBCPP_HIDE_FROM_ABI
+    _Tp operator^=(_Tp __op) _NOEXCEPT          {return fetch_xor(__op) ^ __op;}
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_BASE_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic_flag.h b/third_party/llvm-project/libcxx/include/__atomic/atomic_flag.h
new file mode 100644
index 0000000..46a6ad7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic_flag.h
@@ -0,0 +1,231 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_FLAG_H
+#define _LIBCPP___ATOMIC_ATOMIC_FLAG_H
+
+#include <__atomic/atomic_sync.h>
+#include <__atomic/contention_t.h>
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/memory_order.h>
+#include <__chrono/duration.h>
+#include <__config>
+#include <__threading_support>
+#include <cstdint>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct atomic_flag
+{
+    __cxx_atomic_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_;
+
+    _LIBCPP_HIDE_FROM_ABI
+    bool test(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
+    _LIBCPP_HIDE_FROM_ABI
+    bool test(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
+
+    _LIBCPP_HIDE_FROM_ABI
+    bool test_and_set(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
+        {return __cxx_atomic_exchange(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(true), __m);}
+    _LIBCPP_HIDE_FROM_ABI
+    bool test_and_set(memory_order __m = memory_order_seq_cst) _NOEXCEPT
+        {return __cxx_atomic_exchange(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(true), __m);}
+    _LIBCPP_HIDE_FROM_ABI
+    void clear(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
+        {__cxx_atomic_store(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(false), __m);}
+    _LIBCPP_HIDE_FROM_ABI
+    void clear(memory_order __m = memory_order_seq_cst) _NOEXCEPT
+        {__cxx_atomic_store(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(false), __m);}
+
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void wait(bool __v, memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void wait(bool __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void notify_one() volatile _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void notify_one() _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void notify_all() volatile _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
+    void notify_all() _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+
+#if _LIBCPP_STD_VER >= 20
+    _LIBCPP_HIDE_FROM_ABI constexpr
+    atomic_flag() _NOEXCEPT : __a_(false) {}
+#else
+    _LIBCPP_HIDE_FROM_ABI
+    atomic_flag() _NOEXCEPT = default;
+#endif
+
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
+    atomic_flag(bool __b) _NOEXCEPT : __a_(__b) {} // EXTENSION
+
+    atomic_flag(const atomic_flag&) = delete;
+    atomic_flag& operator=(const atomic_flag&) = delete;
+    atomic_flag& operator=(const atomic_flag&) volatile = delete;
+
+};
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test(const volatile atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test(const atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_explicit(const volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_explicit(const atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_and_set(volatile atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test_and_set();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_and_set(atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test_and_set();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_and_set_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test_and_set(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+bool
+atomic_flag_test_and_set_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test_and_set(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_flag_clear(volatile atomic_flag* __o) _NOEXCEPT
+{
+    __o->clear();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_flag_clear(atomic_flag* __o) _NOEXCEPT
+{
+    __o->clear();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_flag_clear_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    __o->clear(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_flag_clear_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    __o->clear(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait(const volatile atomic_flag* __o, bool __v) _NOEXCEPT
+{
+    __o->wait(__v);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait(const atomic_flag* __o, bool __v) _NOEXCEPT
+{
+    __o->wait(__v);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait_explicit(const volatile atomic_flag* __o,
+                          bool __v, memory_order __m) _NOEXCEPT
+{
+    __o->wait(__v, __m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait_explicit(const atomic_flag* __o,
+                          bool __v, memory_order __m) _NOEXCEPT
+{
+    __o->wait(__v, __m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_one(volatile atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_one(atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_all(volatile atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_all(atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_FLAG_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic_init.h b/third_party/llvm-project/libcxx/include/__atomic/atomic_init.h
new file mode 100644
index 0000000..14310ae
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic_init.h
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_INIT_H
+#define _LIBCPP___ATOMIC_ATOMIC_INIT_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#define ATOMIC_FLAG_INIT {false}
+#define ATOMIC_VAR_INIT(__v) {__v}
+
+#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
+# if defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1400
+#  pragma clang deprecated(ATOMIC_VAR_INIT)
+# endif
+#endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_INIT_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic_lock_free.h b/third_party/llvm-project/libcxx/include/__atomic/atomic_lock_free.h
new file mode 100644
index 0000000..d607569
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic_lock_free.h
@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_LOCK_FREE_H
+#define _LIBCPP___ATOMIC_ATOMIC_LOCK_FREE_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if defined(__CLANG_ATOMIC_BOOL_LOCK_FREE)
+# define ATOMIC_BOOL_LOCK_FREE      __CLANG_ATOMIC_BOOL_LOCK_FREE
+# define ATOMIC_CHAR_LOCK_FREE      __CLANG_ATOMIC_CHAR_LOCK_FREE
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+# define ATOMIC_CHAR8_T_LOCK_FREE   __CLANG_ATOMIC_CHAR8_T_LOCK_FREE
+#endif
+# define ATOMIC_CHAR16_T_LOCK_FREE  __CLANG_ATOMIC_CHAR16_T_LOCK_FREE
+# define ATOMIC_CHAR32_T_LOCK_FREE  __CLANG_ATOMIC_CHAR32_T_LOCK_FREE
+# define ATOMIC_WCHAR_T_LOCK_FREE   __CLANG_ATOMIC_WCHAR_T_LOCK_FREE
+# define ATOMIC_SHORT_LOCK_FREE     __CLANG_ATOMIC_SHORT_LOCK_FREE
+# define ATOMIC_INT_LOCK_FREE       __CLANG_ATOMIC_INT_LOCK_FREE
+# define ATOMIC_LONG_LOCK_FREE      __CLANG_ATOMIC_LONG_LOCK_FREE
+# define ATOMIC_LLONG_LOCK_FREE     __CLANG_ATOMIC_LLONG_LOCK_FREE
+# define ATOMIC_POINTER_LOCK_FREE   __CLANG_ATOMIC_POINTER_LOCK_FREE
+#elif defined(__GCC_ATOMIC_BOOL_LOCK_FREE)
+# define ATOMIC_BOOL_LOCK_FREE      __GCC_ATOMIC_BOOL_LOCK_FREE
+# define ATOMIC_CHAR_LOCK_FREE      __GCC_ATOMIC_CHAR_LOCK_FREE
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+# define ATOMIC_CHAR8_T_LOCK_FREE   __GCC_ATOMIC_CHAR8_T_LOCK_FREE
+#endif
+# define ATOMIC_CHAR16_T_LOCK_FREE  __GCC_ATOMIC_CHAR16_T_LOCK_FREE
+# define ATOMIC_CHAR32_T_LOCK_FREE  __GCC_ATOMIC_CHAR32_T_LOCK_FREE
+# define ATOMIC_WCHAR_T_LOCK_FREE   __GCC_ATOMIC_WCHAR_T_LOCK_FREE
+# define ATOMIC_SHORT_LOCK_FREE     __GCC_ATOMIC_SHORT_LOCK_FREE
+# define ATOMIC_INT_LOCK_FREE       __GCC_ATOMIC_INT_LOCK_FREE
+# define ATOMIC_LONG_LOCK_FREE      __GCC_ATOMIC_LONG_LOCK_FREE
+# define ATOMIC_LLONG_LOCK_FREE     __GCC_ATOMIC_LLONG_LOCK_FREE
+# define ATOMIC_POINTER_LOCK_FREE   __GCC_ATOMIC_POINTER_LOCK_FREE
+#endif
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_LOCK_FREE_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/atomic_sync.h b/third_party/llvm-project/libcxx/include/__atomic/atomic_sync.h
new file mode 100644
index 0000000..d55450b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/atomic_sync.h
@@ -0,0 +1,112 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_ATOMIC_SYNC_H
+#define _LIBCPP___ATOMIC_ATOMIC_SYNC_H
+
+#include <__atomic/contention_t.h>
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/memory_order.h>
+#include <__availability>
+#include <__chrono/duration.h>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__thread/poll_with_backoff.h>
+#include <__threading_support>
+#include <__type_traits/decay.h>
+#include <cstring>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(void const volatile*, __cxx_contention_t);
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(__cxx_atomic_contention_t const volatile*, __cxx_contention_t);
+
+template <class _Atp, class _Fn>
+struct __libcpp_atomic_wait_backoff_impl {
+    _Atp* __a;
+    _Fn __test_fn;
+    _LIBCPP_AVAILABILITY_SYNC
+    _LIBCPP_HIDE_FROM_ABI bool operator()(chrono::nanoseconds __elapsed) const
+    {
+        if(__elapsed > chrono::microseconds(64))
+        {
+            auto const __monitor = std::__libcpp_atomic_monitor(__a);
+            if(__test_fn())
+                return true;
+            std::__libcpp_atomic_wait(__a, __monitor);
+        }
+        else if(__elapsed > chrono::microseconds(4))
+            __libcpp_thread_yield();
+        else
+            {} // poll
+        return false;
+    }
+};
+
+template <class _Atp, class _Fn>
+_LIBCPP_AVAILABILITY_SYNC
+_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_wait(_Atp* __a, _Fn && __test_fn)
+{
+    __libcpp_atomic_wait_backoff_impl<_Atp, __decay_t<_Fn> > __backoff_fn = {__a, __test_fn};
+    return std::__libcpp_thread_poll_with_backoff(__test_fn, __backoff_fn);
+}
+
+#else // _LIBCPP_HAS_NO_THREADS
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_impl<_Tp> const volatile*) { }
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_impl<_Tp> const volatile*) { }
+template <class _Atp, class _Fn>
+_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_wait(_Atp*, _Fn && __test_fn)
+{
+    return std::__libcpp_thread_poll_with_backoff(__test_fn, __spinning_backoff_policy());
+}
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+template <typename _Tp> _LIBCPP_HIDE_FROM_ABI
+bool __cxx_nonatomic_compare_equal(_Tp const& __lhs, _Tp const& __rhs) {
+    return std::memcmp(std::addressof(__lhs), std::addressof(__rhs), sizeof(_Tp)) == 0;
+}
+
+template <class _Atp, class _Tp>
+struct __cxx_atomic_wait_test_fn_impl {
+    _Atp* __a;
+    _Tp __val;
+    memory_order __order;
+    _LIBCPP_HIDE_FROM_ABI bool operator()() const
+    {
+        return !std::__cxx_nonatomic_compare_equal(std::__cxx_atomic_load(__a, __order), __val);
+    }
+};
+
+template <class _Atp, class _Tp>
+_LIBCPP_AVAILABILITY_SYNC
+_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_wait(_Atp* __a, _Tp const __val, memory_order __order)
+{
+    __cxx_atomic_wait_test_fn_impl<_Atp, _Tp> __test_fn = {__a, __val, __order};
+    return std::__cxx_atomic_wait(__a, __test_fn);
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_ATOMIC_SYNC_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/check_memory_order.h b/third_party/llvm-project/libcxx/include/__atomic/check_memory_order.h
new file mode 100644
index 0000000..d744312
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/check_memory_order.h
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_CHECK_MEMORY_ORDER_H
+#define _LIBCPP___ATOMIC_CHECK_MEMORY_ORDER_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#define _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) \
+  _LIBCPP_DIAGNOSE_WARNING(__m == memory_order_consume || \
+                           __m == memory_order_acquire || \
+                           __m == memory_order_acq_rel,   \
+                        "memory order argument to atomic operation is invalid")
+
+#define _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) \
+  _LIBCPP_DIAGNOSE_WARNING(__m == memory_order_release || \
+                           __m == memory_order_acq_rel,   \
+                        "memory order argument to atomic operation is invalid")
+
+#define _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__m, __f) \
+  _LIBCPP_DIAGNOSE_WARNING(__f == memory_order_release || \
+                           __f == memory_order_acq_rel,   \
+                        "memory order argument to atomic operation is invalid")
+
+#endif // _LIBCPP___ATOMIC_CHECK_MEMORY_ORDER_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/contention_t.h b/third_party/llvm-project/libcxx/include/__atomic/contention_t.h
new file mode 100644
index 0000000..1d8d024
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/contention_t.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_CONTENTION_T_H
+#define _LIBCPP___ATOMIC_CONTENTION_T_H
+
+#include <__atomic/cxx_atomic_impl.h>
+#include <__config>
+#include <cstdint>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if defined(__linux__) || (defined(_AIX) && !defined(__64BIT__))
+    using __cxx_contention_t = int32_t;
+#else
+    using __cxx_contention_t = int64_t;
+#endif // __linux__ || (_AIX && !__64BIT__)
+
+using __cxx_atomic_contention_t = __cxx_atomic_impl<__cxx_contention_t>;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_CONTENTION_T_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/cxx_atomic_impl.h b/third_party/llvm-project/libcxx/include/__atomic/cxx_atomic_impl.h
new file mode 100644
index 0000000..167cee7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/cxx_atomic_impl.h
@@ -0,0 +1,831 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
+#define _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
+
+#include <__atomic/is_always_lock_free.h>
+#include <__atomic/memory_order.h>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_assignable.h>
+#include <__type_traits/is_trivially_copyable.h>
+#include <__type_traits/remove_const.h>
+#include <cstddef>
+#include <cstring>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) || \
+    defined(_LIBCPP_ATOMIC_ONLY_USE_BUILTINS)
+
+// [atomics.types.generic]p1 guarantees _Tp is trivially copyable. Because
+// the default operator= in an object is not volatile, a byte-by-byte copy
+// is required.
+template <typename _Tp, typename _Tv> _LIBCPP_HIDE_FROM_ABI
+typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
+__cxx_atomic_assign_volatile(_Tp& __a_value, _Tv const& __val) {
+  __a_value = __val;
+}
+template <typename _Tp, typename _Tv> _LIBCPP_HIDE_FROM_ABI
+typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
+__cxx_atomic_assign_volatile(_Tp volatile& __a_value, _Tv volatile const& __val) {
+  volatile char* __to         = reinterpret_cast<volatile char*>(std::addressof(__a_value));
+  volatile char* __end = __to + sizeof(_Tp);
+  volatile const char* __from = reinterpret_cast<volatile const char*>(std::addressof(__val));
+  while (__to != __end)
+    *__to++ = *__from++;
+}
+
+#endif
+
+#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP)
+
+template <typename _Tp>
+struct __cxx_atomic_base_impl {
+
+  _LIBCPP_HIDE_FROM_ABI
+#ifndef _LIBCPP_CXX03_LANG
+    __cxx_atomic_base_impl() _NOEXCEPT = default;
+#else
+    __cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
+#endif // _LIBCPP_CXX03_LANG
+  _LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp value) _NOEXCEPT
+    : __a_value(value) {}
+  _Tp __a_value;
+};
+
+_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
+  // Avoid switch statement to make this a constexpr.
+  return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
+         (__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
+          (__order == memory_order_release ? __ATOMIC_RELEASE:
+           (__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
+            (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL:
+              __ATOMIC_CONSUME))));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
+  // Avoid switch statement to make this a constexpr.
+  return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
+         (__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
+          (__order == memory_order_release ? __ATOMIC_RELAXED:
+           (__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
+            (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE:
+              __ATOMIC_CONSUME))));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(volatile __cxx_atomic_base_impl<_Tp>* __a,  _Tp __val) {
+  __cxx_atomic_assign_volatile(__a->__a_value, __val);
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp>* __a,  _Tp __val) {
+  __a->__a_value = __val;
+}
+
+_LIBCPP_HIDE_FROM_ABI inline
+void __cxx_atomic_thread_fence(memory_order __order) {
+  __atomic_thread_fence(__to_gcc_order(__order));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline
+void __cxx_atomic_signal_fence(memory_order __order) {
+  __atomic_signal_fence(__to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(volatile __cxx_atomic_base_impl<_Tp>* __a,  _Tp __val,
+                        memory_order __order) {
+  __atomic_store(std::addressof(__a->__a_value), std::addressof(__val), __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp>* __a,  _Tp __val,
+                        memory_order __order) {
+  __atomic_store(std::addressof(__a->__a_value), std::addressof(__val), __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(const volatile __cxx_atomic_base_impl<_Tp>* __a,
+                      memory_order __order) {
+  _Tp __ret;
+  __atomic_load(std::addressof(__a->__a_value), std::addressof(__ret), __to_gcc_order(__order));
+  return __ret;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(const __cxx_atomic_base_impl<_Tp>* __a, memory_order __order) {
+  _Tp __ret;
+  __atomic_load(std::addressof(__a->__a_value), std::addressof(__ret), __to_gcc_order(__order));
+  return __ret;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                          _Tp __value, memory_order __order) {
+  _Tp __ret;
+  __atomic_exchange(
+      std::addressof(__a->__a_value), std::addressof(__value), std::addressof(__ret), __to_gcc_order(__order));
+  return __ret;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp>* __a, _Tp __value,
+                          memory_order __order) {
+  _Tp __ret;
+  __atomic_exchange(
+      std::addressof(__a->__a_value), std::addressof(__value), std::addressof(__ret), __to_gcc_order(__order));
+  return __ret;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(
+    volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
+    memory_order __success, memory_order __failure) {
+  return __atomic_compare_exchange(
+      std::addressof(__a->__a_value),
+      __expected,
+      std::addressof(__value),
+      false,
+      __to_gcc_order(__success),
+      __to_gcc_failure_order(__failure));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(
+    __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
+    memory_order __failure) {
+  return __atomic_compare_exchange(
+      std::addressof(__a->__a_value),
+      __expected,
+      std::addressof(__value),
+      false,
+      __to_gcc_order(__success),
+      __to_gcc_failure_order(__failure));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(
+    volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
+    memory_order __success, memory_order __failure) {
+  return __atomic_compare_exchange(
+      std::addressof(__a->__a_value),
+      __expected,
+      std::addressof(__value),
+      true,
+      __to_gcc_order(__success),
+      __to_gcc_failure_order(__failure));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(
+    __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
+    memory_order __failure) {
+  return __atomic_compare_exchange(
+      std::addressof(__a->__a_value),
+      __expected,
+      std::addressof(__value),
+      true,
+      __to_gcc_order(__success),
+      __to_gcc_failure_order(__failure));
+}
+
+template <typename _Tp>
+struct __skip_amt { enum {value = 1}; };
+
+template <typename _Tp>
+struct __skip_amt<_Tp*> { enum {value = sizeof(_Tp)}; };
+
+// FIXME: Haven't figured out what the spec says about using arrays with
+// atomic_fetch_add. Force a failure rather than creating bad behavior.
+template <typename _Tp>
+struct __skip_amt<_Tp[]> { };
+template <typename _Tp, int n>
+struct __skip_amt<_Tp[n]> { };
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                           _Td __delta, memory_order __order) {
+  return __atomic_fetch_add(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
+                           memory_order __order) {
+  return __atomic_fetch_add(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                           _Td __delta, memory_order __order) {
+  return __atomic_fetch_sub(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
+                           memory_order __order) {
+  return __atomic_fetch_sub(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order __order) {
+  return __atomic_fetch_and(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order __order) {
+  return __atomic_fetch_and(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                          _Tp __pattern, memory_order __order) {
+  return __atomic_fetch_or(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
+                          memory_order __order) {
+  return __atomic_fetch_or(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_base_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order __order) {
+  return __atomic_fetch_xor(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
+                           memory_order __order) {
+  return __atomic_fetch_xor(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
+}
+
+#define __cxx_atomic_is_lock_free(__s) __atomic_is_lock_free(__s, 0)
+
+#elif defined(_LIBCPP_HAS_C_ATOMIC_IMP)
+
+template <typename _Tp>
+struct __cxx_atomic_base_impl {
+
+  _LIBCPP_HIDE_FROM_ABI
+#ifndef _LIBCPP_CXX03_LANG
+    __cxx_atomic_base_impl() _NOEXCEPT = default;
+#else
+    __cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
+#endif // _LIBCPP_CXX03_LANG
+  _LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp __value) _NOEXCEPT
+    : __a_value(__value) {}
+  _LIBCPP_DISABLE_EXTENSION_WARNING _Atomic(_Tp) __a_value;
+};
+
+#define __cxx_atomic_is_lock_free(__s) __c11_atomic_is_lock_free(__s)
+
+_LIBCPP_HIDE_FROM_ABI inline
+void __cxx_atomic_thread_fence(memory_order __order) _NOEXCEPT {
+    __c11_atomic_thread_fence(static_cast<__memory_order_underlying_t>(__order));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline
+void __cxx_atomic_signal_fence(memory_order __order) _NOEXCEPT {
+    __c11_atomic_signal_fence(static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val) _NOEXCEPT {
+    __c11_atomic_init(std::addressof(__a->__a_value), __val);
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val) _NOEXCEPT {
+    __c11_atomic_init(std::addressof(__a->__a_value), __val);
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val, memory_order __order) _NOEXCEPT {
+    __c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val, memory_order __order) _NOEXCEPT {
+    __c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const volatile* __a, memory_order __order) _NOEXCEPT {
+    using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
+    return __c11_atomic_load(
+        const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const* __a, memory_order __order) _NOEXCEPT {
+    using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
+    return __c11_atomic_load(
+        const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __value, memory_order __order) _NOEXCEPT {
+    return __c11_atomic_exchange(
+        std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> * __a, _Tp __value, memory_order __order) _NOEXCEPT {
+    return __c11_atomic_exchange(
+        std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR memory_order __to_failure_order(memory_order __order) {
+  // Avoid switch statement to make this a constexpr.
+  return __order == memory_order_release ? memory_order_relaxed:
+         (__order == memory_order_acq_rel ? memory_order_acquire:
+             __order);
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
+  return __c11_atomic_compare_exchange_strong(
+      std::addressof(__a->__a_value),
+      __expected,
+      __value,
+      static_cast<__memory_order_underlying_t>(__success),
+      static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
+  return __c11_atomic_compare_exchange_strong(
+      std::addressof(__a->__a_value),
+      __expected,
+      __value,
+      static_cast<__memory_order_underlying_t>(__success),
+      static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
+  return __c11_atomic_compare_exchange_weak(
+      std::addressof(__a->__a_value),
+      __expected,
+      __value,
+      static_cast<__memory_order_underlying_t>(__success),
+      static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
+  return __c11_atomic_compare_exchange_weak(
+      std::addressof(__a->__a_value),
+      __expected,
+      __value,
+      static_cast<__memory_order_underlying_t>(__success),
+      static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_add(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_add(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_add(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_add(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_sub(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_sub(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_sub(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_sub(
+      std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_and(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_and(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_or(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_or(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_xor(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+template<class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
+  return __c11_atomic_fetch_xor(
+      std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
+}
+
+#endif // _LIBCPP_HAS_GCC_ATOMIC_IMP, _LIBCPP_HAS_C_ATOMIC_IMP
+
+#ifdef _LIBCPP_ATOMIC_ONLY_USE_BUILTINS
+
+template<typename _Tp>
+struct __cxx_atomic_lock_impl {
+
+  _LIBCPP_HIDE_FROM_ABI
+  __cxx_atomic_lock_impl() _NOEXCEPT
+    : __a_value(), __a_lock(0) {}
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit
+  __cxx_atomic_lock_impl(_Tp value) _NOEXCEPT
+    : __a_value(value), __a_lock(0) {}
+
+  _Tp __a_value;
+  mutable __cxx_atomic_base_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_lock;
+
+  _LIBCPP_HIDE_FROM_ABI void __lock() const volatile {
+    while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
+        /*spin*/;
+  }
+  _LIBCPP_HIDE_FROM_ABI void __lock() const {
+    while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
+        /*spin*/;
+  }
+  _LIBCPP_HIDE_FROM_ABI void __unlock() const volatile {
+    __cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
+  }
+  _LIBCPP_HIDE_FROM_ABI void __unlock() const {
+    __cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
+  }
+  _LIBCPP_HIDE_FROM_ABI _Tp __read() const volatile {
+    __lock();
+    _Tp __old;
+    __cxx_atomic_assign_volatile(__old, __a_value);
+    __unlock();
+    return __old;
+  }
+  _LIBCPP_HIDE_FROM_ABI _Tp __read() const {
+    __lock();
+    _Tp __old = __a_value;
+    __unlock();
+    return __old;
+  }
+};
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(volatile __cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val) {
+  __cxx_atomic_assign_volatile(__a->__a_value, __val);
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_init(__cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val) {
+  __a->__a_value = __val;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(volatile __cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val, memory_order) {
+  __a->__lock();
+  __cxx_atomic_assign_volatile(__a->__a_value, __val);
+  __a->__unlock();
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+void __cxx_atomic_store(__cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val, memory_order) {
+  __a->__lock();
+  __a->__a_value = __val;
+  __a->__unlock();
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(const volatile __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
+  return __a->__read();
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_load(const __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
+  return __a->__read();
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(volatile __cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, __value);
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_exchange(__cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value = __value;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                                          _Tp* __expected, _Tp __value, memory_order, memory_order) {
+  _Tp __temp;
+  __a->__lock();
+  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
+  bool __ret = (std::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
+  if(__ret)
+    __cxx_atomic_assign_volatile(__a->__a_value, __value);
+  else
+    __cxx_atomic_assign_volatile(*__expected, __a->__a_value);
+  __a->__unlock();
+  return __ret;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_lock_impl<_Tp>* __a,
+                                          _Tp* __expected, _Tp __value, memory_order, memory_order) {
+  __a->__lock();
+  bool __ret = (std::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
+  if(__ret)
+    std::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
+  else
+    std::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
+  __a->__unlock();
+  return __ret;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                                        _Tp* __expected, _Tp __value, memory_order, memory_order) {
+  _Tp __temp;
+  __a->__lock();
+  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
+  bool __ret = (std::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
+  if(__ret)
+    __cxx_atomic_assign_volatile(__a->__a_value, __value);
+  else
+    __cxx_atomic_assign_volatile(*__expected, __a->__a_value);
+  __a->__unlock();
+  return __ret;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_lock_impl<_Tp>* __a,
+                                        _Tp* __expected, _Tp __value, memory_order, memory_order) {
+  __a->__lock();
+  bool __ret = (std::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
+  if(__ret)
+    std::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
+  else
+    std::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
+  __a->__unlock();
+  return __ret;
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                           _Td __delta, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old + __delta));
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp>* __a,
+                           _Td __delta, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value += __delta;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp*>* __a,
+                           ptrdiff_t __delta, memory_order) {
+  __a->__lock();
+  _Tp* __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, __old + __delta);
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp* __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp*>* __a,
+                           ptrdiff_t __delta, memory_order) {
+  __a->__lock();
+  _Tp* __old = __a->__a_value;
+  __a->__a_value += __delta;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                           _Td __delta, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old - __delta));
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp, typename _Td>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_sub(__cxx_atomic_lock_impl<_Tp>* __a,
+                           _Td __delta, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value -= __delta;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old & __pattern));
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_and(__cxx_atomic_lock_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value &= __pattern;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                          _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old | __pattern));
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_or(__cxx_atomic_lock_impl<_Tp>* __a,
+                          _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value |= __pattern;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_lock_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old;
+  __cxx_atomic_assign_volatile(__old, __a->__a_value);
+  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old ^ __pattern));
+  __a->__unlock();
+  return __old;
+}
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp __cxx_atomic_fetch_xor(__cxx_atomic_lock_impl<_Tp>* __a,
+                           _Tp __pattern, memory_order) {
+  __a->__lock();
+  _Tp __old = __a->__a_value;
+  __a->__a_value ^= __pattern;
+  __a->__unlock();
+  return __old;
+}
+
+template <typename _Tp,
+          typename _Base = typename conditional<__libcpp_is_always_lock_free<_Tp>::__value,
+                                                __cxx_atomic_base_impl<_Tp>,
+                                                __cxx_atomic_lock_impl<_Tp> >::type>
+#else
+template <typename _Tp,
+          typename _Base = __cxx_atomic_base_impl<_Tp> >
+#endif //_LIBCPP_ATOMIC_ONLY_USE_BUILTINS
+struct __cxx_atomic_impl : public _Base {
+    static_assert(is_trivially_copyable<_Tp>::value,
+      "std::atomic<T> requires that 'T' be a trivially copyable type");
+
+  _LIBCPP_HIDE_FROM_ABI __cxx_atomic_impl() _NOEXCEPT = default;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __cxx_atomic_impl(_Tp __value) _NOEXCEPT
+    : _Base(__value) {}
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/fence.h b/third_party/llvm-project/libcxx/include/__atomic/fence.h
new file mode 100644
index 0000000..c62f38f
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/fence.h
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_FENCE_H
+#define _LIBCPP___ATOMIC_FENCE_H
+
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/memory_order.h>
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_thread_fence(memory_order __m) _NOEXCEPT
+{
+    __cxx_atomic_thread_fence(__m);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void
+atomic_signal_fence(memory_order __m) _NOEXCEPT
+{
+    __cxx_atomic_signal_fence(__m);
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_FENCE_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/is_always_lock_free.h b/third_party/llvm-project/libcxx/include/__atomic/is_always_lock_free.h
new file mode 100644
index 0000000..fbbd437
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/is_always_lock_free.h
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
+#define _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+struct __libcpp_is_always_lock_free {
+  // __atomic_always_lock_free is available in all Standard modes
+  static const bool __value = __atomic_always_lock_free(sizeof(_Tp), 0);
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/kill_dependency.h b/third_party/llvm-project/libcxx/include/__atomic/kill_dependency.h
new file mode 100644
index 0000000..1bd5c8c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/kill_dependency.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_KILL_DEPENDENCY_H
+#define _LIBCPP___ATOMIC_KILL_DEPENDENCY_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+_LIBCPP_HIDE_FROM_ABI
+_Tp kill_dependency(_Tp __y) _NOEXCEPT
+{
+    return __y;
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_KILL_DEPENDENCY_H
diff --git a/third_party/llvm-project/libcxx/include/__atomic/memory_order.h b/third_party/llvm-project/libcxx/include/__atomic/memory_order.h
new file mode 100644
index 0000000..3671dc3
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__atomic/memory_order.h
@@ -0,0 +1,72 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_MEMORY_ORDER_H
+#define _LIBCPP___ATOMIC_MEMORY_ORDER_H
+
+#include <__config>
+#include <__type_traits/is_same.h>
+#include <__type_traits/underlying_type.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// Figure out what the underlying type for `memory_order` would be if it were
+// declared as an unscoped enum (accounting for -fshort-enums). Use this result
+// to pin the underlying type in C++20.
+enum __legacy_memory_order {
+    __mo_relaxed,
+    __mo_consume,
+    __mo_acquire,
+    __mo_release,
+    __mo_acq_rel,
+    __mo_seq_cst
+};
+
+using __memory_order_underlying_t = underlying_type<__legacy_memory_order>::type;
+
+#if _LIBCPP_STD_VER >= 20
+
+enum class memory_order : __memory_order_underlying_t {
+  relaxed = __mo_relaxed,
+  consume = __mo_consume,
+  acquire = __mo_acquire,
+  release = __mo_release,
+  acq_rel = __mo_acq_rel,
+  seq_cst = __mo_seq_cst
+};
+
+static_assert((is_same<underlying_type<memory_order>::type, __memory_order_underlying_t>::value),
+  "unexpected underlying type for std::memory_order");
+
+inline constexpr auto memory_order_relaxed = memory_order::relaxed;
+inline constexpr auto memory_order_consume = memory_order::consume;
+inline constexpr auto memory_order_acquire = memory_order::acquire;
+inline constexpr auto memory_order_release = memory_order::release;
+inline constexpr auto memory_order_acq_rel = memory_order::acq_rel;
+inline constexpr auto memory_order_seq_cst = memory_order::seq_cst;
+
+#else
+
+enum memory_order {
+  memory_order_relaxed = __mo_relaxed,
+  memory_order_consume = __mo_consume,
+  memory_order_acquire = __mo_acquire,
+  memory_order_release = __mo_release,
+  memory_order_acq_rel = __mo_acq_rel,
+  memory_order_seq_cst = __mo_seq_cst,
+};
+
+#endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_MEMORY_ORDER_H
diff --git a/third_party/llvm-project/libcxx/include/__availability b/third_party/llvm-project/libcxx/include/__availability
index 6dfca3f..3c4c5cc 100644
--- a/third_party/llvm-project/libcxx/include/__availability
+++ b/third_party/llvm-project/libcxx/include/__availability
@@ -39,17 +39,23 @@
 //
 // This mechanism is general in nature, and any vendor can add their markup to
 // the library (see below). Whenever a new feature is added that requires support
-// in the shared library, a macro should be added below to mark this feature
-// as unavailable. When vendors decide to ship the feature as part of their
-// shared library, they can update the markup appropriately.
+// in the shared library, two macros are added below to allow marking the feature
+// as unavailable:
+// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` which must be defined
+//    exactly when compiling for a target that doesn't support the feature.
+// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must always be defined
+//    and must expand to the proper availability attribute for the platform.
+//
+// When vendors decide to ship the feature as part of their shared library, they
+// can update these macros appropriately for their platform, and the library will
+// use those to provide an optimal user experience.
 //
 // Furthermore, many features in the standard library have corresponding
-// feature-test macros. When a feature is made unavailable on some deployment
-// target, a macro should be defined to signal that it is unavailable. That
-// macro can then be picked up when feature-test macros are generated (see
-// generate_feature_test_macro_components.py) to make sure that feature-test
-// macros don't announce a feature as being implemented if it has been marked
-// as unavailable.
+// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` macros
+// are checked by the corresponding feature-test macros generated by
+// generate_feature_test_macro_components.py to ensure that the library
+// doesn't announce a feature as being implemented if it is unavailable on
+// the deployment target.
 //
 // Note that this mechanism is disabled by default in the "upstream" libc++.
 // Availability annotations are only meaningful when shipping libc++ inside
@@ -83,9 +89,8 @@
 
     // This controls the availability of std::shared_mutex and std::shared_timed_mutex,
     // which were added to the dylib later.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX
 #   define _LIBCPP_AVAILABILITY_SHARED_MUTEX
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex
 
     // These macros control the availability of std::bad_optional_access and
     // other exception types. These were put in the shared library to prevent
@@ -95,16 +100,23 @@
     // Note that when exceptions are disabled, the methods that normally throw
     // these exceptions can be used even on older deployment targets, but those
     // methods will abort instead of throwing.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS
 #   define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
+
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS
 #   define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
+
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST
 #   define _LIBCPP_AVAILABILITY_BAD_ANY_CAST
 
     // This controls the availability of std::uncaught_exceptions().
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS
 #   define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS
 
     // This controls the availability of the sized version of ::operator delete,
     // ::operator delete[], and their align_val_t variants, which were all added
     // in C++17, and hence not present in early dylibs.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE
 #   define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE
 
     // This controls the availability of the std::future_error exception.
@@ -112,73 +124,78 @@
     // Note that when exceptions are disabled, the methods that normally throw
     // std::future_error can be used even on older deployment targets, but those
     // methods will abort instead of throwing.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR
 #   define _LIBCPP_AVAILABILITY_FUTURE_ERROR
 
     // This controls the availability of std::type_info's vtable.
     // I can't imagine how using std::type_info can work at all if
     // this isn't supported.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE
 #   define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE
 
     // This controls the availability of std::locale::category members
     // (e.g. std::locale::collate), which are defined in the dylib.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY
 #   define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY
 
     // This controls the availability of atomic operations on std::shared_ptr
     // (e.g. `std::atomic_store(std::shared_ptr)`), which require a shared
     // lock table located in the dylib.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR
 #   define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR
 
     // These macros control the availability of all parts of <filesystem> that
     // depend on something in the dylib.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM
 #   define _LIBCPP_AVAILABILITY_FILESYSTEM
 #   define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH
 #   define _LIBCPP_AVAILABILITY_FILESYSTEM_POP
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem
 
     // This controls the availability of floating-point std::to_chars functions.
     // These overloads were added later than the integer overloads.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT
 #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT
 
     // This controls the availability of the C++20 synchronization library,
     // which requires shared library support for various operations
     // (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
     // <semaphore>, and notification functions on std::atomic.
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_SYNC
 #   define _LIBCPP_AVAILABILITY_SYNC
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
-
-    // This controls the availability of the C++20 format library.
-    // The library is in development and not ABI stable yet. P2216 is
-    // retroactively accepted in C++20. This paper contains ABI breaking
-    // changes.
-#   define _LIBCPP_AVAILABILITY_FORMAT
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
 
     // This controls whether the library claims to provide a default verbose
     // termination function, and consequently whether the headers will try
     // to use it when the mechanism isn't overriden at compile-time.
-// #   define _LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY
+// #   define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT
+#   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT
 
 #elif defined(__APPLE__)
 
+    // shared_mutex and shared_timed_mutex
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX
+#   endif
 #   define _LIBCPP_AVAILABILITY_SHARED_MUTEX                                    \
         __attribute__((availability(macos,strict,introduced=10.12)))            \
         __attribute__((availability(ios,strict,introduced=10.0)))               \
         __attribute__((availability(tvos,strict,introduced=10.0)))              \
         __attribute__((availability(watchos,strict,introduced=3.0)))
-#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \
-        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \
-        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \
-        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex
-#   endif
 
+        // bad_optional_access, bad_variant_access and bad_any_cast
         // Note: bad_optional_access & friends were not introduced in the matching
         // macOS and iOS versions, so the version mismatch between macOS and others
         // is intended.
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS
+#       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS
+#       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST
+#   endif
 #   define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS                             \
         __attribute__((availability(macos,strict,introduced=10.13)))            \
         __attribute__((availability(ios,strict,introduced=12.0)))               \
@@ -189,33 +206,73 @@
 #   define _LIBCPP_AVAILABILITY_BAD_ANY_CAST                                    \
         _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
 
+    // uncaught_exceptions
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS
+#   endif
 #   define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS                             \
         __attribute__((availability(macos,strict,introduced=10.12)))            \
         __attribute__((availability(ios,strict,introduced=10.0)))               \
         __attribute__((availability(tvos,strict,introduced=10.0)))              \
         __attribute__((availability(watchos,strict,introduced=3.0)))
 
+    // sized operator new and sized operator delete
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE
+#   endif
 #   define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE                                \
         __attribute__((availability(macos,strict,introduced=10.12)))            \
         __attribute__((availability(ios,strict,introduced=10.0)))               \
         __attribute__((availability(tvos,strict,introduced=10.0)))              \
         __attribute__((availability(watchos,strict,introduced=3.0)))
 
+    // future_error
+#   if (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 60000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR
+#   endif
 #   define _LIBCPP_AVAILABILITY_FUTURE_ERROR                                    \
         __attribute__((availability(ios,strict,introduced=6.0)))
 
+    // type_info's vtable
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE
+#   endif
 #   define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE                                 \
         __attribute__((availability(macos,strict,introduced=10.9)))             \
         __attribute__((availability(ios,strict,introduced=7.0)))
 
+    // locale::category
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY
+#   endif
 #   define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY                                 \
         __attribute__((availability(macos,strict,introduced=10.9)))             \
         __attribute__((availability(ios,strict,introduced=7.0)))
 
+    // atomic operations on shared_ptr
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR
+#   endif
 #   define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR                               \
         __attribute__((availability(macos,strict,introduced=10.9)))             \
         __attribute__((availability(ios,strict,introduced=7.0)))
 
+    // <filesystem>
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM
+#   endif
 #   define _LIBCPP_AVAILABILITY_FILESYSTEM                                      \
         __attribute__((availability(macos,strict,introduced=10.15)))            \
         __attribute__((availability(ios,strict,introduced=13.0)))               \
@@ -231,36 +288,39 @@
         _Pragma("clang attribute pop")                                          \
         _Pragma("clang attribute pop")                                          \
         _Pragma("clang attribute pop")
-#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) ||    \
-        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000) || \
-        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) ||         \
-        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem
+
+    // std::to_chars(floating-point)
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130300) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160300) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160300) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90300)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT
 #   endif
-
 #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT                         \
-        __attribute__((unavailable))
+        __attribute__((availability(macos,strict,introduced=13.3)))             \
+        __attribute__((availability(ios,strict,introduced=16.3)))               \
+        __attribute__((availability(tvos,strict,introduced=16.3)))              \
+        __attribute__((availability(watchos,strict,introduced=9.3)))
 
+    // c++20 synchronization library
+#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) ||    \
+        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
+        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) ||         \
+        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
+#       define _LIBCPP_AVAILABILITY_HAS_NO_SYNC
+#   endif
 #   define _LIBCPP_AVAILABILITY_SYNC                                            \
         __attribute__((availability(macos,strict,introduced=11.0)))             \
         __attribute__((availability(ios,strict,introduced=14.0)))               \
         __attribute__((availability(tvos,strict,introduced=14.0)))              \
         __attribute__((availability(watchos,strict,introduced=7.0)))
-#   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) ||    \
-        (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
-        (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) ||         \
-        (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch
-#       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
+
+    // __libcpp_verbose_abort
+#   if 1 // TODO: Update once this is released
+#       define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT
 #   endif
-
-#   define _LIBCPP_AVAILABILITY_FORMAT                                          \
+#   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT                                   \
         __attribute__((unavailable))
-#   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
-
-#   define _LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY
 
 #else
 
@@ -270,10 +330,10 @@
 
 #endif
 
-// Define availability attributes that depend on _LIBCPP_NO_EXCEPTIONS.
+// Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.
 // Those are defined in terms of the availability attributes above, and
 // should not be vendor-specific.
-#if defined(_LIBCPP_NO_EXCEPTIONS)
+#if defined(_LIBCPP_HAS_NO_EXCEPTIONS)
 #   define _LIBCPP_AVAILABILITY_FUTURE
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
diff --git a/third_party/llvm-project/libcxx/include/__bit/bit_cast.h b/third_party/llvm-project/libcxx/include/__bit/bit_cast.h
index 2ca4120..3984246 100644
--- a/third_party/llvm-project/libcxx/include/__bit/bit_cast.h
+++ b/third_party/llvm-project/libcxx/include/__bit/bit_cast.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _ToType, class _FromType>
   requires(sizeof(_ToType) == sizeof(_FromType) &&
@@ -29,7 +29,7 @@
   return __builtin_bit_cast(_ToType, __from);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__bit/bit_ceil.h b/third_party/llvm-project/libcxx/include/__bit/bit_ceil.h
index a558d61..1332900 100644
--- a/third_party/llvm-project/libcxx/include/__bit/bit_ceil.h
+++ b/third_party/llvm-project/libcxx/include/__bit/bit_ceil.h
@@ -34,8 +34,8 @@
     return _Tp{1} << __n;
   else {
     const unsigned __extra = numeric_limits<unsigned>::digits - numeric_limits<_Tp>::digits;
-    const unsigned __retVal = 1u << (__n + __extra);
-    return (_Tp)(__retVal >> __extra);
+    const unsigned __ret_val = 1u << (__n + __extra);
+    return (_Tp)(__ret_val >> __extra);
   }
 }
 
diff --git a/third_party/llvm-project/libcxx/include/__bit/byteswap.h b/third_party/llvm-project/libcxx/include/__bit/byteswap.h
index 6fa8d48..b290e80 100644
--- a/third_party/llvm-project/libcxx/include/__bit/byteswap.h
+++ b/third_party/llvm-project/libcxx/include/__bit/byteswap.h
@@ -13,7 +13,6 @@
 #include <__concepts/arithmetic.h>
 #include <__config>
 #include <cstdint>
-#include <cstdlib>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -21,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 template <integral _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr _Tp byteswap(_Tp __val) noexcept {
@@ -48,7 +47,7 @@
   }
 }
 
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__bit_reference b/third_party/llvm-project/libcxx/include/__bit_reference
index 2665749..95188ff 100644
--- a/third_party/llvm-project/libcxx/include/__bit_reference
+++ b/third_party/llvm-project/libcxx/include/__bit_reference
@@ -19,8 +19,9 @@
 #include <__iterator/iterator_traits.h>
 #include <__memory/construct_at.h>
 #include <__memory/pointer_traits.h>
+#include <__type_traits/conditional.h>
+#include <__utility/swap.h>
 #include <cstring>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -75,7 +76,7 @@
         return *this;
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr const __bit_reference& operator=(bool __x) const noexcept {
         if (__x)
             *__seg_ |= __mask_;
@@ -155,6 +156,8 @@
     friend typename _Cp::__self;
     friend class __bit_iterator<_Cp, true>;
 public:
+    using __container = typename _Cp::__self;
+
     _LIBCPP_INLINE_VISIBILITY
     __bit_const_reference(const __bit_const_reference&) = default;
 
@@ -1135,7 +1138,7 @@
 
 public:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     : __seg_(nullptr), __ctz_(0)
 #endif
     {}
diff --git a/third_party/llvm-project/libcxx/include/__charconv/chars_format.h b/third_party/llvm-project/libcxx/include/__charconv/chars_format.h
index 695bd87..0e781c0 100644
--- a/third_party/llvm-project/libcxx/include/__charconv/chars_format.h
+++ b/third_party/llvm-project/libcxx/include/__charconv/chars_format.h
@@ -19,58 +19,45 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
-enum class _LIBCPP_ENUM_VIS chars_format
-{
-    scientific = 0x1,
-    fixed = 0x2,
-    hex = 0x4,
-    general = fixed | scientific
-};
+enum class _LIBCPP_ENUM_VIS chars_format { scientific = 0x1, fixed = 0x2, hex = 0x4, general = fixed | scientific };
 
-inline _LIBCPP_INLINE_VISIBILITY constexpr chars_format
-operator~(chars_format __x) {
-  return chars_format(~_VSTD::__to_underlying(__x));
+inline _LIBCPP_HIDE_FROM_ABI constexpr chars_format operator~(chars_format __x) {
+  return chars_format(~std::__to_underlying(__x));
 }
 
-inline _LIBCPP_INLINE_VISIBILITY constexpr chars_format
-operator&(chars_format __x, chars_format __y) {
-  return chars_format(_VSTD::__to_underlying(__x) &
-                      _VSTD::__to_underlying(__y));
+inline _LIBCPP_HIDE_FROM_ABI constexpr chars_format operator&(chars_format __x, chars_format __y) {
+  return chars_format(std::__to_underlying(__x) & std::__to_underlying(__y));
 }
 
-inline _LIBCPP_INLINE_VISIBILITY constexpr chars_format
-operator|(chars_format __x, chars_format __y) {
-  return chars_format(_VSTD::__to_underlying(__x) |
-                      _VSTD::__to_underlying(__y));
+inline _LIBCPP_HIDE_FROM_ABI constexpr chars_format operator|(chars_format __x, chars_format __y) {
+  return chars_format(std::__to_underlying(__x) | std::__to_underlying(__y));
 }
 
-inline _LIBCPP_INLINE_VISIBILITY constexpr chars_format
-operator^(chars_format __x, chars_format __y) {
-  return chars_format(_VSTD::__to_underlying(__x) ^
-                      _VSTD::__to_underlying(__y));
+inline _LIBCPP_HIDE_FROM_ABI constexpr chars_format operator^(chars_format __x, chars_format __y) {
+  return chars_format(std::__to_underlying(__x) ^ std::__to_underlying(__y));
 }
 
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
 operator&=(chars_format& __x, chars_format __y) {
   __x = __x & __y;
   return __x;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
 operator|=(chars_format& __x, chars_format __y) {
   __x = __x | __y;
   return __x;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 chars_format&
 operator^=(chars_format& __x, chars_format __y) {
   __x = __x ^ __y;
   return __x;
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__charconv/from_chars_integral.h b/third_party/llvm-project/libcxx/include/__charconv/from_chars_integral.h
new file mode 100644
index 0000000..990aa21
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__charconv/from_chars_integral.h
@@ -0,0 +1,239 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHARCONV_FROM_CHARS_INTEGRAL_H
+#define _LIBCPP___CHARCONV_FROM_CHARS_INTEGRAL_H
+
+#include <__algorithm/copy_n.h>
+#include <__charconv/from_chars_result.h>
+#include <__charconv/traits.h>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__system_error/errc.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_integral.h>
+#include <__type_traits/is_unsigned.h>
+#include <__type_traits/make_unsigned.h>
+#include <limits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 17
+
+from_chars_result from_chars(const char*, const char*, bool, int = 10) = delete;
+
+template <typename _It, typename _Tp, typename _Fn, typename... _Ts>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__sign_combinator(_It __first, _It __last, _Tp& __value, _Fn __f, _Ts... __args) {
+  using __tl = numeric_limits<_Tp>;
+  decltype(std::__to_unsigned_like(__value)) __x;
+
+  bool __neg = (__first != __last && *__first == '-');
+  auto __r   = __f(__neg ? __first + 1 : __first, __last, __x, __args...);
+  switch (__r.ec) {
+  case errc::invalid_argument:
+    return {__first, __r.ec};
+  case errc::result_out_of_range:
+    return __r;
+  default:
+    break;
+  }
+
+  if (__neg) {
+    if (__x <= std::__complement(std::__to_unsigned_like(__tl::min()))) {
+      __x = std::__complement(__x);
+      std::copy_n(std::addressof(__x), 1, std::addressof(__value));
+      return __r;
+    }
+  } else {
+    if (__x <= std::__to_unsigned_like(__tl::max())) {
+      __value = __x;
+      return __r;
+    }
+  }
+
+  return {__r.ptr, errc::result_out_of_range};
+}
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool __in_pattern(_Tp __c) {
+  return '0' <= __c && __c <= '9';
+}
+
+struct _LIBCPP_HIDDEN __in_pattern_result {
+  bool __ok;
+  int __val;
+
+  explicit _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI operator bool() const { return __ok; }
+};
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI __in_pattern_result __in_pattern(_Tp __c, int __base) {
+  if (__base <= 10)
+    return {'0' <= __c && __c < '0' + __base, __c - '0'};
+  else if (std::__in_pattern(__c))
+    return {true, __c - '0'};
+  else if ('a' <= __c && __c < 'a' + __base - 10)
+    return {true, __c - 'a' + 10};
+  else
+    return {'A' <= __c && __c < 'A' + __base - 10, __c - 'A' + 10};
+}
+
+template <typename _It, typename _Tp, typename _Fn, typename... _Ts>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__subject_seq_combinator(_It __first, _It __last, _Tp& __value, _Fn __f, _Ts... __args) {
+  auto __find_non_zero = [](_It __firstit, _It __lastit) {
+    for (; __firstit != __lastit; ++__firstit)
+      if (*__firstit != '0')
+        break;
+    return __firstit;
+  };
+
+  auto __p = __find_non_zero(__first, __last);
+  if (__p == __last || !std::__in_pattern(*__p, __args...)) {
+    if (__p == __first)
+      return {__first, errc::invalid_argument};
+    else {
+      __value = 0;
+      return {__p, {}};
+    }
+  }
+
+  auto __r = __f(__p, __last, __value, __args...);
+  if (__r.ec == errc::result_out_of_range) {
+    for (; __r.ptr != __last; ++__r.ptr) {
+      if (!std::__in_pattern(*__r.ptr, __args...))
+        break;
+    }
+  }
+
+  return __r;
+}
+
+template <typename _Tp, typename enable_if<is_unsigned<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__from_chars_atoi(const char* __first, const char* __last, _Tp& __value) {
+  using __tx          = __itoa::__traits<_Tp>;
+  using __output_type = typename __tx::type;
+
+  return std::__subject_seq_combinator(
+      __first, __last, __value, [](const char* __f, const char* __l, _Tp& __val) -> from_chars_result {
+        __output_type __a, __b;
+        auto __p = __tx::__read(__f, __l, __a, __b);
+        if (__p == __l || !std::__in_pattern(*__p)) {
+          __output_type __m = numeric_limits<_Tp>::max();
+          if (__m >= __a && __m - __a >= __b) {
+            __val = __a + __b;
+            return {__p, {}};
+          }
+        }
+        return {__p, errc::result_out_of_range};
+      });
+}
+
+template <typename _Tp, typename enable_if<is_signed<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__from_chars_atoi(const char* __first, const char* __last, _Tp& __value) {
+  using __t = decltype(std::__to_unsigned_like(__value));
+  return std::__sign_combinator(__first, __last, __value, __from_chars_atoi<__t>);
+}
+
+/*
+// Code used to generate __from_chars_log2f_lut.
+#include <cmath>
+#include <format>
+#include <iostream>
+
+int main() {
+  for (int i = 2; i <= 36; ++i)
+    std::cout << std::format("{},\n", log2f(i));
+}
+*/
+/// log2f table for bases [2, 36].
+inline constexpr float __from_chars_log2f_lut[35] = {
+    1,         1.5849625, 2,         2.321928, 2.5849626, 2.807355, 3,        3.169925,  3.321928,
+    3.4594316, 3.5849626, 3.7004397, 3.807355, 3.9068906, 4,        4.087463, 4.169925,  4.2479277,
+    4.321928,  4.3923173, 4.4594316, 4.523562, 4.5849624, 4.643856, 4.70044,  4.7548876, 4.807355,
+    4.857981,  4.9068904, 4.9541965, 5,        5.044394,  5.087463, 5.129283, 5.169925};
+
+template <typename _Tp, typename enable_if<is_unsigned<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__from_chars_integral(const char* __first, const char* __last, _Tp& __value, int __base) {
+  if (__base == 10)
+    return std::__from_chars_atoi(__first, __last, __value);
+
+  return std::__subject_seq_combinator(
+      __first,
+      __last,
+      __value,
+      [](const char* __p, const char* __lastp, _Tp& __val, int __b) -> from_chars_result {
+        using __tl = numeric_limits<_Tp>;
+        // __base is always between 2 and 36 inclusive.
+        auto __digits = __tl::digits / __from_chars_log2f_lut[__b - 2];
+        _Tp __x = __in_pattern(*__p++, __b).__val, __y = 0;
+
+        for (int __i = 1; __p != __lastp; ++__i, ++__p) {
+          if (auto __c = __in_pattern(*__p, __b)) {
+            if (__i < __digits - 1)
+              __x = __x * __b + __c.__val;
+            else {
+              if (!__itoa::__mul_overflowed(__x, __b, __x))
+                ++__p;
+              __y = __c.__val;
+              break;
+            }
+          } else
+            break;
+        }
+
+        if (__p == __lastp || !__in_pattern(*__p, __b)) {
+          if (__tl::max() - __x >= __y) {
+            __val = __x + __y;
+            return {__p, {}};
+          }
+        }
+        return {__p, errc::result_out_of_range};
+      },
+      __base);
+}
+
+template <typename _Tp, typename enable_if<is_signed<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+__from_chars_integral(const char* __first, const char* __last, _Tp& __value, int __base) {
+  using __t = decltype(std::__to_unsigned_like(__value));
+  return std::__sign_combinator(__first, __last, __value, __from_chars_integral<__t>, __base);
+}
+
+template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+from_chars(const char* __first, const char* __last, _Tp& __value) {
+  return std::__from_chars_atoi(__first, __last, __value);
+}
+
+template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
+from_chars(const char* __first, const char* __last, _Tp& __value, int __base) {
+  _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]");
+  return std::__from_chars_integral(__first, __last, __value, __base);
+}
+#endif // _LIBCPP_STD_VER >= 17
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___CHARCONV_FROM_CHARS_INTEGRAL_H
diff --git a/third_party/llvm-project/libcxx/include/__charconv/from_chars_result.h b/third_party/llvm-project/libcxx/include/__charconv/from_chars_result.h
index 05ffe14..7eeb9ec 100644
--- a/third_party/llvm-project/libcxx/include/__charconv/from_chars_result.h
+++ b/third_party/llvm-project/libcxx/include/__charconv/from_chars_result.h
@@ -11,7 +11,7 @@
 #define _LIBCPP___CHARCONV_FROM_CHARS_RESULT_H
 
 #include <__config>
-#include <__errc>
+#include <__system_error/errc.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -19,18 +19,17 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
-struct _LIBCPP_TYPE_VIS from_chars_result
-{
-    const char* ptr;
-    errc ec;
-#  if _LIBCPP_STD_VER > 17
-    _LIBCPP_HIDE_FROM_ABI friend bool operator==(const from_chars_result&, const from_chars_result&) = default;
+struct _LIBCPP_TYPE_VIS from_chars_result {
+  const char* ptr;
+  errc ec;
+#  if _LIBCPP_STD_VER >= 20
+  _LIBCPP_HIDE_FROM_ABI friend bool operator==(const from_chars_result&, const from_chars_result&) = default;
 #  endif
 };
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__charconv/tables.h b/third_party/llvm-project/libcxx/include/__charconv/tables.h
index 9b82440..6b93536 100644
--- a/third_party/llvm-project/libcxx/include/__charconv/tables.h
+++ b/third_party/llvm-project/libcxx/include/__charconv/tables.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 namespace __itoa {
 
@@ -62,32 +62,41 @@
     'f', 'd', 'f', 'e', 'f', 'f'};
 
 inline constexpr uint32_t __pow10_32[10] = {
-    UINT32_C(0),      UINT32_C(10),      UINT32_C(100),      UINT32_C(1000),      UINT32_C(10000),
-    UINT32_C(100000), UINT32_C(1000000), UINT32_C(10000000), UINT32_C(100000000), UINT32_C(1000000000)};
+    UINT32_C(0),
+    UINT32_C(10),
+    UINT32_C(100),
+    UINT32_C(1000),
+    UINT32_C(10000),
+    UINT32_C(100000),
+    UINT32_C(1000000),
+    UINT32_C(10000000),
+    UINT32_C(100000000),
+    UINT32_C(1000000000)};
 
-inline constexpr uint64_t __pow10_64[20] = {UINT64_C(0),
-                                               UINT64_C(10),
-                                               UINT64_C(100),
-                                               UINT64_C(1000),
-                                               UINT64_C(10000),
-                                               UINT64_C(100000),
-                                               UINT64_C(1000000),
-                                               UINT64_C(10000000),
-                                               UINT64_C(100000000),
-                                               UINT64_C(1000000000),
-                                               UINT64_C(10000000000),
-                                               UINT64_C(100000000000),
-                                               UINT64_C(1000000000000),
-                                               UINT64_C(10000000000000),
-                                               UINT64_C(100000000000000),
-                                               UINT64_C(1000000000000000),
-                                               UINT64_C(10000000000000000),
-                                               UINT64_C(100000000000000000),
-                                               UINT64_C(1000000000000000000),
-                                               UINT64_C(10000000000000000000)};
+inline constexpr uint64_t __pow10_64[20] = {
+    UINT64_C(0),
+    UINT64_C(10),
+    UINT64_C(100),
+    UINT64_C(1000),
+    UINT64_C(10000),
+    UINT64_C(100000),
+    UINT64_C(1000000),
+    UINT64_C(10000000),
+    UINT64_C(100000000),
+    UINT64_C(1000000000),
+    UINT64_C(10000000000),
+    UINT64_C(100000000000),
+    UINT64_C(1000000000000),
+    UINT64_C(10000000000000),
+    UINT64_C(100000000000000),
+    UINT64_C(1000000000000000),
+    UINT64_C(10000000000000000),
+    UINT64_C(100000000000000000),
+    UINT64_C(1000000000000000000),
+    UINT64_C(10000000000000000000)};
 
 #  ifndef _LIBCPP_HAS_NO_INT128
-inline constexpr int __pow10_128_offset = 0;
+inline constexpr int __pow10_128_offset      = 0;
 inline constexpr __uint128_t __pow10_128[40] = {
     UINT64_C(0),
     UINT64_C(10),
@@ -147,7 +156,7 @@
 
 } // namespace __itoa
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__charconv/to_chars.h b/third_party/llvm-project/libcxx/include/__charconv/to_chars.h
new file mode 100644
index 0000000..8ef09af
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__charconv/to_chars.h
@@ -0,0 +1,25 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHARCONV_TO_CHARS
+#define _LIBCPP___CHARCONV_TO_CHARS
+
+#include <__charconv/to_chars_floating_point.h>
+#include <__charconv/to_chars_integral.h>
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CHARCONV_TO_CHARS
diff --git a/third_party/llvm-project/libcxx/include/__charconv/to_chars_base_10.h b/third_party/llvm-project/libcxx/include/__charconv/to_chars_base_10.h
index fc7fb76..028ff33 100644
--- a/third_party/llvm-project/libcxx/include/__charconv/to_chars_base_10.h
+++ b/third_party/llvm-project/libcxx/include/__charconv/to_chars_base_10.h
@@ -25,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 namespace __itoa {
 
@@ -72,7 +72,8 @@
                            static_cast<uint32_t>(__value % 100000000));
 }
 
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char* __base_10_u32(char* __first, uint32_t __value) noexcept {
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char*
+__base_10_u32(char* __first, uint32_t __value) noexcept {
   if (__value < 1000000) {
     if (__value < 10000) {
       if (__value < 100) {
@@ -107,7 +108,8 @@
   return __itoa::__append10(__first, __value);
 }
 
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char* __base_10_u64(char* __buffer, uint64_t __value) noexcept {
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char*
+__base_10_u64(char* __buffer, uint64_t __value) noexcept {
   if (__value <= UINT32_MAX)
     return __itoa::__base_10_u32(__buffer, static_cast<uint32_t>(__value));
 
@@ -134,7 +136,8 @@
   return __pow10_128[__exp - __pow10_128_offset];
 }
 
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char* __base_10_u128(char* __buffer, __uint128_t __value) noexcept {
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI inline char*
+__base_10_u128(char* __buffer, __uint128_t __value) noexcept {
   _LIBCPP_ASSERT(
       __value > numeric_limits<uint64_t>::max(), "The optimizations for this algorithm fail when this isn't true.");
 
@@ -159,8 +162,7 @@
     __value %= __itoa::__pow_10(29);
     __buffer = __itoa::__append10(__buffer, static_cast<uint64_t>(__value / __itoa::__pow_10(19)));
     __value %= __itoa::__pow_10(19);
-  }
-  else {
+  } else {
     // step 2
     // This version needs to determine the position of the leading non-zero digit.
     __buffer = __base_10_u64(__buffer, static_cast<uint64_t>(__value / __itoa::__pow_10(19)));
@@ -176,7 +178,7 @@
 #  endif
 } // namespace __itoa
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__charconv/to_chars_floating_point.h b/third_party/llvm-project/libcxx/include/__charconv/to_chars_floating_point.h
new file mode 100644
index 0000000..6ede36e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__charconv/to_chars_floating_point.h
@@ -0,0 +1,56 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHARCONV_TO_CHARS_FLOATING_POINT_H
+#define _LIBCPP___CHARCONV_TO_CHARS_FLOATING_POINT_H
+
+#include <__availability>
+#include <__charconv/chars_format.h>
+#include <__charconv/to_chars_result.h>
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 17
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, float __value);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, double __value);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, long double __value);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, float __value, chars_format __fmt);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, double __value, chars_format __fmt);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, long double __value, chars_format __fmt);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, float __value, chars_format __fmt, int __precision);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, double __value, chars_format __fmt, int __precision);
+
+_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS to_chars_result
+to_chars(char* __first, char* __last, long double __value, chars_format __fmt, int __precision);
+#endif // _LIBCPP_STD_VER >= 17
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CHARCONV_TO_CHARS_FLOATING_POINT_H
diff --git a/third_party/llvm-project/libcxx/include/__charconv/to_chars_integral.h b/third_party/llvm-project/libcxx/include/__charconv/to_chars_integral.h
new file mode 100644
index 0000000..6c726c0
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__charconv/to_chars_integral.h
@@ -0,0 +1,326 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHARCONV_TO_CHARS_INTEGRAL_H
+#define _LIBCPP___CHARCONV_TO_CHARS_INTEGRAL_H
+
+#include <__algorithm/copy_n.h>
+#include <__bit/countl.h>
+#include <__charconv/tables.h>
+#include <__charconv/to_chars_base_10.h>
+#include <__charconv/to_chars_result.h>
+#include <__charconv/traits.h>
+#include <__config>
+#include <__system_error/errc.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/make_32_64_or_128_bit.h>
+#include <__type_traits/make_unsigned.h>
+#include <__utility/unreachable.h>
+#include <cstddef>
+#include <cstdint>
+#include <limits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 17
+
+to_chars_result to_chars(char*, char*, bool, int = 10) = delete;
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_itoa(char* __first, char* __last, _Tp __value, false_type);
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_itoa(char* __first, char* __last, _Tp __value, true_type) {
+  auto __x = std::__to_unsigned_like(__value);
+  if (__value < 0 && __first != __last) {
+    *__first++ = '-';
+    __x        = std::__complement(__x);
+  }
+
+  return std::__to_chars_itoa(__first, __last, __x, false_type());
+}
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_itoa(char* __first, char* __last, _Tp __value, false_type) {
+  using __tx  = __itoa::__traits<_Tp>;
+  auto __diff = __last - __first;
+
+  if (__tx::digits <= __diff || __tx::__width(__value) <= __diff)
+    return {__tx::__convert(__first, __value), errc(0)};
+  else
+    return {__last, errc::value_too_large};
+}
+
+#  ifndef _LIBCPP_HAS_NO_INT128
+template <>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_itoa(char* __first, char* __last, __uint128_t __value, false_type) {
+  // When the value fits in 64-bits use the 64-bit code path. This reduces
+  // the number of expensive calculations on 128-bit values.
+  //
+  // NOTE the 128-bit code path requires this optimization.
+  if (__value <= numeric_limits<uint64_t>::max())
+    return __to_chars_itoa(__first, __last, static_cast<uint64_t>(__value), false_type());
+
+  using __tx  = __itoa::__traits<__uint128_t>;
+  auto __diff = __last - __first;
+
+  if (__tx::digits <= __diff || __tx::__width(__value) <= __diff)
+    return {__tx::__convert(__first, __value), errc(0)};
+  else
+    return {__last, errc::value_too_large};
+}
+#  endif
+
+template <class _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_integral(char* __first, char* __last, _Tp __value, int __base, false_type);
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_integral(char* __first, char* __last, _Tp __value, int __base, true_type) {
+  auto __x = std::__to_unsigned_like(__value);
+  if (__value < 0 && __first != __last) {
+    *__first++ = '-';
+    __x        = std::__complement(__x);
+  }
+
+  return std::__to_chars_integral(__first, __last, __x, __base, false_type());
+}
+
+namespace __itoa {
+
+template <unsigned _Base>
+struct _LIBCPP_HIDDEN __integral;
+
+template <>
+struct _LIBCPP_HIDDEN __integral<2> {
+  template <typename _Tp>
+  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
+    // If value == 0 still need one digit. If the value != this has no
+    // effect since the code scans for the most significant bit set. (Note
+    // that __libcpp_clz doesn't work for 0.)
+    return numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1);
+  }
+
+  template <typename _Tp>
+  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result
+  __to_chars(char* __first, char* __last, _Tp __value) {
+    ptrdiff_t __cap = __last - __first;
+    int __n         = __width(__value);
+    if (__n > __cap)
+      return {__last, errc::value_too_large};
+
+    __last                   = __first + __n;
+    char* __p                = __last;
+    const unsigned __divisor = 16;
+    while (__value > __divisor) {
+      unsigned __c = __value % __divisor;
+      __value /= __divisor;
+      __p -= 4;
+      std::copy_n(&__base_2_lut[4 * __c], 4, __p);
+    }
+    do {
+      unsigned __c = __value % 2;
+      __value /= 2;
+      *--__p = "01"[__c];
+    } while (__value != 0);
+    return {__last, errc(0)};
+  }
+};
+
+template <>
+struct _LIBCPP_HIDDEN __integral<8> {
+  template <typename _Tp>
+  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
+    // If value == 0 still need one digit. If the value != this has no
+    // effect since the code scans for the most significat bit set. (Note
+    // that __libcpp_clz doesn't work for 0.)
+    return ((numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1)) + 2) / 3;
+  }
+
+  template <typename _Tp>
+  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result
+  __to_chars(char* __first, char* __last, _Tp __value) {
+    ptrdiff_t __cap = __last - __first;
+    int __n         = __width(__value);
+    if (__n > __cap)
+      return {__last, errc::value_too_large};
+
+    __last             = __first + __n;
+    char* __p          = __last;
+    unsigned __divisor = 64;
+    while (__value > __divisor) {
+      unsigned __c = __value % __divisor;
+      __value /= __divisor;
+      __p -= 2;
+      std::copy_n(&__base_8_lut[2 * __c], 2, __p);
+    }
+    do {
+      unsigned __c = __value % 8;
+      __value /= 8;
+      *--__p = "01234567"[__c];
+    } while (__value != 0);
+    return {__last, errc(0)};
+  }
+};
+
+template <>
+struct _LIBCPP_HIDDEN __integral<16> {
+  template <typename _Tp>
+  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
+    // If value == 0 still need one digit. If the value != this has no
+    // effect since the code scans for the most significat bit set. (Note
+    // that __libcpp_clz doesn't work for 0.)
+    return (numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1) + 3) / 4;
+  }
+
+  template <typename _Tp>
+  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result
+  __to_chars(char* __first, char* __last, _Tp __value) {
+    ptrdiff_t __cap = __last - __first;
+    int __n         = __width(__value);
+    if (__n > __cap)
+      return {__last, errc::value_too_large};
+
+    __last             = __first + __n;
+    char* __p          = __last;
+    unsigned __divisor = 256;
+    while (__value > __divisor) {
+      unsigned __c = __value % __divisor;
+      __value /= __divisor;
+      __p -= 2;
+      std::copy_n(&__base_16_lut[2 * __c], 2, __p);
+    }
+    if (__first != __last)
+      do {
+        unsigned __c = __value % 16;
+        __value /= 16;
+        *--__p = "0123456789abcdef"[__c];
+      } while (__value != 0);
+    return {__last, errc(0)};
+  }
+};
+
+} // namespace __itoa
+
+template <unsigned _Base, typename _Tp, typename enable_if<(sizeof(_Tp) >= sizeof(unsigned)), int>::type = 0>
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __to_chars_integral_width(_Tp __value) {
+  return __itoa::__integral<_Base>::__width(__value);
+}
+
+template <unsigned _Base, typename _Tp, typename enable_if<(sizeof(_Tp) < sizeof(unsigned)), int>::type = 0>
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __to_chars_integral_width(_Tp __value) {
+  return std::__to_chars_integral_width<_Base>(static_cast<unsigned>(__value));
+}
+
+template <unsigned _Base, typename _Tp, typename enable_if<(sizeof(_Tp) >= sizeof(unsigned)), int>::type = 0>
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_integral(char* __first, char* __last, _Tp __value) {
+  return __itoa::__integral<_Base>::__to_chars(__first, __last, __value);
+}
+
+template <unsigned _Base, typename _Tp, typename enable_if<(sizeof(_Tp) < sizeof(unsigned)), int>::type = 0>
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_integral(char* __first, char* __last, _Tp __value) {
+  return std::__to_chars_integral<_Base>(__first, __last, static_cast<unsigned>(__value));
+}
+
+template <typename _Tp>
+_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __to_chars_integral_width(_Tp __value, unsigned __base) {
+  _LIBCPP_ASSERT(__value >= 0, "The function requires a non-negative value.");
+
+  unsigned __base_2 = __base * __base;
+  unsigned __base_3 = __base_2 * __base;
+  unsigned __base_4 = __base_2 * __base_2;
+
+  int __r = 0;
+  while (true) {
+    if (__value < __base)
+      return __r + 1;
+    if (__value < __base_2)
+      return __r + 2;
+    if (__value < __base_3)
+      return __r + 3;
+    if (__value < __base_4)
+      return __r + 4;
+
+    __value /= __base_4;
+    __r += 4;
+  }
+
+  __libcpp_unreachable();
+}
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+__to_chars_integral(char* __first, char* __last, _Tp __value, int __base, false_type) {
+  if (__base == 10) [[likely]]
+    return std::__to_chars_itoa(__first, __last, __value, false_type());
+
+  switch (__base) {
+  case 2:
+    return std::__to_chars_integral<2>(__first, __last, __value);
+  case 8:
+    return std::__to_chars_integral<8>(__first, __last, __value);
+  case 16:
+    return std::__to_chars_integral<16>(__first, __last, __value);
+  }
+
+  ptrdiff_t __cap = __last - __first;
+  int __n         = std::__to_chars_integral_width(__value, __base);
+  if (__n > __cap)
+    return {__last, errc::value_too_large};
+
+  __last    = __first + __n;
+  char* __p = __last;
+  do {
+    unsigned __c = __value % __base;
+    __value /= __base;
+    *--__p = "0123456789abcdefghijklmnopqrstuvwxyz"[__c];
+  } while (__value != 0);
+  return {__last, errc(0)};
+}
+
+template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+to_chars(char* __first, char* __last, _Tp __value) {
+  using _Type = __make_32_64_or_128_bit_t<_Tp>;
+  static_assert(!is_same<_Type, void>::value, "unsupported integral type used in to_chars");
+  return std::__to_chars_itoa(__first, __last, static_cast<_Type>(__value), is_signed<_Tp>());
+}
+
+template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
+to_chars(char* __first, char* __last, _Tp __value, int __base) {
+  _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]");
+
+  using _Type = __make_32_64_or_128_bit_t<_Tp>;
+  return std::__to_chars_integral(__first, __last, static_cast<_Type>(__value), __base, is_signed<_Tp>());
+}
+
+#endif // _LIBCPP_STD_VER >= 17
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___CHARCONV_TO_CHARS_INTEGRAL_H
diff --git a/third_party/llvm-project/libcxx/include/__charconv/to_chars_result.h b/third_party/llvm-project/libcxx/include/__charconv/to_chars_result.h
index 2eb4098..67221b3 100644
--- a/third_party/llvm-project/libcxx/include/__charconv/to_chars_result.h
+++ b/third_party/llvm-project/libcxx/include/__charconv/to_chars_result.h
@@ -11,7 +11,7 @@
 #define _LIBCPP___CHARCONV_TO_CHARS_RESULT_H
 
 #include <__config>
-#include <__errc>
+#include <__system_error/errc.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -19,18 +19,17 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
-struct _LIBCPP_TYPE_VIS to_chars_result
-{
-    char* ptr;
-    errc ec;
-#  if _LIBCPP_STD_VER > 17
-    _LIBCPP_HIDE_FROM_ABI friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
+struct _LIBCPP_TYPE_VIS to_chars_result {
+  char* ptr;
+  errc ec;
+#  if _LIBCPP_STD_VER >= 20
+  _LIBCPP_HIDE_FROM_ABI friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
 #  endif
 };
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__charconv/traits.h b/third_party/llvm-project/libcxx/include/__charconv/traits.h
new file mode 100644
index 0000000..505a0b1
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__charconv/traits.h
@@ -0,0 +1,199 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHARCONV_TRAITS
+#define _LIBCPP___CHARCONV_TRAITS
+
+#include <__bit/countl.h>
+#include <__charconv/tables.h>
+#include <__charconv/to_chars_base_10.h>
+#include <__config>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_unsigned.h>
+#include <cstdint>
+#include <limits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 17
+
+namespace __itoa {
+
+template <typename _Tp, typename = void>
+struct _LIBCPP_HIDDEN __traits_base;
+
+template <typename _Tp>
+struct _LIBCPP_HIDDEN __traits_base<_Tp, __enable_if_t<sizeof(_Tp) <= sizeof(uint32_t)>> {
+  using type = uint32_t;
+
+  /// The width estimation using a log10 algorithm.
+  ///
+  /// The algorithm is based on
+  /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
+  /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
+  /// function requires its input to have at least one bit set the value of
+  /// zero is set to one. This means the first element of the lookup table is
+  /// zero.
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v) {
+    auto __t = (32 - std::__libcpp_clz(static_cast<type>(__v | 1))) * 1233 >> 12;
+    return __t - (__v < __itoa::__pow10_32[__t]) + 1;
+  }
+
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v) {
+    return __itoa::__base_10_u32(__p, __v);
+  }
+
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_32)& __pow() {
+    return __itoa::__pow10_32;
+  }
+};
+
+template <typename _Tp>
+struct _LIBCPP_HIDDEN __traits_base<_Tp, __enable_if_t<sizeof(_Tp) == sizeof(uint64_t)>> {
+  using type = uint64_t;
+
+  /// The width estimation using a log10 algorithm.
+  ///
+  /// The algorithm is based on
+  /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
+  /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
+  /// function requires its input to have at least one bit set the value of
+  /// zero is set to one. This means the first element of the lookup table is
+  /// zero.
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v) {
+    auto __t = (64 - std::__libcpp_clz(static_cast<type>(__v | 1))) * 1233 >> 12;
+    return __t - (__v < __itoa::__pow10_64[__t]) + 1;
+  }
+
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v) {
+    return __itoa::__base_10_u64(__p, __v);
+  }
+
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_64)& __pow() {
+    return __itoa::__pow10_64;
+  }
+};
+
+#  ifndef _LIBCPP_HAS_NO_INT128
+template <typename _Tp>
+struct _LIBCPP_HIDDEN __traits_base<_Tp, __enable_if_t<sizeof(_Tp) == sizeof(__uint128_t)> > {
+  using type = __uint128_t;
+
+  /// The width estimation using a log10 algorithm.
+  ///
+  /// The algorithm is based on
+  /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
+  /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
+  /// function requires its input to have at least one bit set the value of
+  /// zero is set to one. This means the first element of the lookup table is
+  /// zero.
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v) {
+    _LIBCPP_ASSERT(
+        __v > numeric_limits<uint64_t>::max(), "The optimizations for this algorithm fail when this isn't true.");
+    // There's always a bit set in the upper 64-bits.
+    auto __t = (128 - std::__libcpp_clz(static_cast<uint64_t>(__v >> 64))) * 1233 >> 12;
+    _LIBCPP_ASSERT(__t >= __itoa::__pow10_128_offset, "Index out of bounds");
+    // __t is adjusted since the lookup table misses the lower entries.
+    return __t - (__v < __itoa::__pow10_128[__t - __itoa::__pow10_128_offset]) + 1;
+  }
+
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v) {
+    return __itoa::__base_10_u128(__p, __v);
+  }
+
+  // TODO FMT This pow function should get an index.
+  // By moving this to its own header it can be reused by the pow function in to_chars_base_10.
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_128)& __pow() {
+    return __itoa::__pow10_128;
+  }
+};
+#  endif
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
+__mul_overflowed(unsigned char __a, _Tp __b, unsigned char& __r) {
+  auto __c = __a * __b;
+  __r      = __c;
+  return __c > numeric_limits<unsigned char>::max();
+}
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
+__mul_overflowed(unsigned short __a, _Tp __b, unsigned short& __r) {
+  auto __c = __a * __b;
+  __r      = __c;
+  return __c > numeric_limits<unsigned short>::max();
+}
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool __mul_overflowed(_Tp __a, _Tp __b, _Tp& __r) {
+  static_assert(is_unsigned<_Tp>::value, "");
+  return __builtin_mul_overflow(__a, __b, &__r);
+}
+
+template <typename _Tp, typename _Up>
+inline _LIBCPP_HIDE_FROM_ABI bool _LIBCPP_CONSTEXPR_SINCE_CXX23 __mul_overflowed(_Tp __a, _Up __b, _Tp& __r) {
+  return __itoa::__mul_overflowed(__a, static_cast<_Tp>(__b), __r);
+}
+
+template <typename _Tp>
+struct _LIBCPP_HIDDEN __traits : __traits_base<_Tp> {
+  static constexpr int digits = numeric_limits<_Tp>::digits10 + 1;
+  using __traits_base<_Tp>::__pow;
+  using typename __traits_base<_Tp>::type;
+
+  // precondition: at least one non-zero character available
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char const*
+  __read(char const* __p, char const* __ep, type& __a, type& __b) {
+    type __cprod[digits];
+    int __j = digits - 1;
+    int __i = digits;
+    do {
+      if (*__p < '0' || *__p > '9')
+        break;
+      __cprod[--__i] = *__p++ - '0';
+    } while (__p != __ep && __i != 0);
+
+    __a = __inner_product(__cprod + __i + 1, __cprod + __j, __pow() + 1, __cprod[__i]);
+    if (__itoa::__mul_overflowed(__cprod[__j], __pow()[__j - __i], __b))
+      --__p;
+    return __p;
+  }
+
+  template <typename _It1, typename _It2, class _Up>
+  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI _Up
+  __inner_product(_It1 __first1, _It1 __last1, _It2 __first2, _Up __init) {
+    for (; __first1 < __last1; ++__first1, ++__first2)
+      __init = __init + *__first1 * *__first2;
+    return __init;
+  }
+};
+
+} // namespace __itoa
+
+template <typename _Tp>
+inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI _Tp __complement(_Tp __x) {
+  static_assert(is_unsigned<_Tp>::value, "cast to unsigned first");
+  return _Tp(~__x + 1);
+}
+
+#endif // _LIBCPP_STD_VER >= 17
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___CHARCONV_TRAITS
diff --git a/third_party/llvm-project/libcxx/include/__chrono/calendar.h b/third_party/llvm-project/libcxx/include/__chrono/calendar.h
index d3762a6..e14f96d 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/calendar.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/calendar.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -39,6 +39,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_CALENDAR_H
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h b/third_party/llvm-project/libcxx/include/__chrono/concepts.h
similarity index 60%
copy from third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h
copy to third_party/llvm-project/libcxx/include/__chrono/concepts.h
index 87407ad..61ec256 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/concepts.h
@@ -1,3 +1,4 @@
+// -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -6,13 +7,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _LIBCPP___TUPLE_PAIR_LIKE_H
-#define _LIBCPP___TUPLE_PAIR_LIKE_H
+#ifndef _LIBCPP___CHRONO_CONCEPTS_H
+#define _LIBCPP___CHRONO_CONCEPTS_H
 
+#include <__chrono/hh_mm_ss.h>
+#include <__chrono/time_point.h>
 #include <__config>
-#include <__tuple_dir/tuple_like.h>
-#include <__tuple_dir/tuple_size.h>
-#include <__type_traits/remove_cvref.h>
+#include <__type_traits/is_specialization.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -23,10 +24,13 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <class _Tp>
-concept __pair_like = __tuple_like<_Tp> && tuple_size<remove_cvref_t<_Tp>>::value == 2;
+concept __is_hh_mm_ss = __is_specialization_v<_Tp, chrono::hh_mm_ss>;
+
+template <class _Tp>
+concept __is_time_point = __is_specialization_v<_Tp, chrono::time_point>;
 
 #endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP___TUPLE_PAIR_LIKE_H
+#endif // _LIBCPP___CHRONO_CONCEPTS_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/convert_to_tm.h b/third_party/llvm-project/libcxx/include/__chrono/convert_to_tm.h
index 36846b3..95cde20 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/convert_to_tm.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/convert_to_tm.h
@@ -10,6 +10,7 @@
 #ifndef _LIBCPP___CHRONO_CONVERT_TO_TM_H
 #define _LIBCPP___CHRONO_CONVERT_TO_TM_H
 
+#include <__chrono/concepts.h>
 #include <__chrono/day.h>
 #include <__chrono/duration.h>
 #include <__chrono/hh_mm_ss.h>
@@ -26,17 +27,22 @@
 #include <__chrono/year_month_weekday.h>
 #include <__concepts/same_as.h>
 #include <__config>
+#include <__format/format_error.h>
 #include <__memory/addressof.h>
 #include <cstdint>
 #include <ctime>
+#include <limits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // Conerts a chrono date and weekday to a given _Tm type.
 //
@@ -76,7 +82,25 @@
   __result.tm_zone = "UTC";
 #  endif
 
-  if constexpr (chrono::__is_duration<_ChronoT>::value) {
+  if constexpr (__is_time_point<_ChronoT>) {
+    if constexpr (same_as<typename _ChronoT::clock, chrono::system_clock>) {
+      chrono::sys_days __days = chrono::time_point_cast<chrono::days>(__value);
+      chrono::year_month_day __ymd{__days};
+
+      __result = std::__convert_to_tm<_Tm>(chrono::year_month_day{__ymd}, chrono::weekday{__days});
+
+      // TODO FMT D138826 has improvements for this part.
+      // TODO FMT Since this is identical for duration and system time it would be good to avoid code duplication.
+      uint64_t __sec =
+          chrono::duration_cast<chrono::seconds>(__value - chrono::time_point_cast<chrono::seconds>(__days)).count();
+      __sec %= 24 * 3600;
+      __result.tm_hour = __sec / 3600;
+      __sec %= 3600;
+      __result.tm_min = __sec / 60;
+      __result.tm_sec = __sec % 60;
+    } else
+      static_assert(sizeof(_ChronoT) == 0, "TODO: Add the missing clock specialization");
+  } else if constexpr (chrono::__is_duration<_ChronoT>::value) {
     // [time.format]/6
     //   ...  However, if a flag refers to a "time of day" (e.g. %H, %I, %p,
     //   etc.), then a specialization of duration is interpreted as the time of
@@ -114,14 +138,26 @@
   } else if constexpr (same_as<_ChronoT, chrono::year_month_weekday> ||
                        same_as<_ChronoT, chrono::year_month_weekday_last>) {
     return std::__convert_to_tm<_Tm>(chrono::year_month_day{static_cast<chrono::sys_days>(__value)}, __value.weekday());
+  } else if constexpr (__is_hh_mm_ss<_ChronoT>) {
+    __result.tm_sec = __value.seconds().count();
+    __result.tm_min = __value.minutes().count();
+    // In libc++ hours is stored as a long. The type in std::tm is an int. So
+    // the overflow can only occur when hour uses more bits than an int
+    // provides.
+    if constexpr (sizeof(std::chrono::hours::rep) > sizeof(__result.tm_hour))
+      if (__value.hours().count() > std::numeric_limits<decltype(__result.tm_hour)>::max())
+        std::__throw_format_error("Formatting hh_mm_ss, encountered an hour overflow");
+    __result.tm_hour = __value.hours().count();
   } else
     static_assert(sizeof(_ChronoT) == 0, "Add the missing type specialization");
 
   return __result;
 }
 
-#endif //if _LIBCPP_STD_VER > 17
+#endif // if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
+_LIBCPP_POP_MACROS
+
 #endif // _LIBCPP___CHRONO_CONVERT_TO_TM_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/day.h b/third_party/llvm-project/libcxx/include/__chrono/day.h
index 35ecfcf..13a885c 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/day.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/day.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -79,6 +79,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_DAY_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/duration.h b/third_party/llvm-project/libcxx/include/__chrono/duration.h
index afcc38b..2c8d50a 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/duration.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/duration.h
@@ -10,6 +10,8 @@
 #ifndef _LIBCPP___CHRONO_DURATION_H
 #define _LIBCPP___CHRONO_DURATION_H
 
+#include <__compare/ordering.h>
+#include <__compare/three_way_comparable.h>
 #include <__config>
 #include <__type_traits/common_type.h>
 #include <__type_traits/enable_if.h>
@@ -130,7 +132,7 @@
 template <class _Rep>
 struct _LIBCPP_TEMPLATE_VIS treat_as_floating_point : is_floating_point<_Rep> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Rep>
 inline constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value;
 #endif
@@ -144,7 +146,7 @@
     _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR _Rep min()  _NOEXCEPT {return numeric_limits<_Rep>::lowest();}
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _ToDuration, class _Rep, class _Period>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 typename enable_if
@@ -186,11 +188,11 @@
 {
     _ToDuration __lower = chrono::floor<_ToDuration>(__d);
     _ToDuration __upper = __lower + _ToDuration{1};
-    auto __lowerDiff = __d - __lower;
-    auto __upperDiff = __upper - __d;
-    if (__lowerDiff < __upperDiff)
+    auto __lower_diff   = __d - __lower;
+    auto __upper_diff   = __upper - __d;
+    if (__lower_diff < __upper_diff)
         return __lower;
-    if (__lowerDiff > __upperDiff)
+    if (__lower_diff > __upper_diff)
         return __upper;
     return __lower.count() & 1 ? __upper : __lower;
 }
@@ -307,7 +309,7 @@
 typedef duration<long long              > seconds;
 typedef duration<     long, ratio<  60> > minutes;
 typedef duration<     long, ratio<3600> > hours;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 typedef duration<     int, ratio_multiply<ratio<24>, hours::period>>         days;
 typedef duration<     int, ratio_multiply<ratio<7>,   days::period>>         weeks;
 typedef duration<     int, ratio_multiply<ratio<146097, 400>, days::period>> years;
@@ -343,6 +345,8 @@
     return __duration_eq<duration<_Rep1, _Period1>, duration<_Rep2, _Period2> >()(__lhs, __rhs);
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 // Duration !=
 
 template <class _Rep1, class _Period1, class _Rep2, class _Period2>
@@ -354,6 +358,8 @@
     return !(__lhs == __rhs);
 }
 
+#endif // _LIBCPP_STD_VER <= 17
+
 // Duration <
 
 template <class _LhsDuration, class _RhsDuration>
@@ -417,6 +423,20 @@
     return !(__lhs < __rhs);
 }
 
+#if _LIBCPP_STD_VER >= 20
+
+template<class _Rep1, class _Period1, class _Rep2, class _Period2>
+  requires three_way_comparable<common_type_t<_Rep1, _Rep2>>
+_LIBCPP_HIDE_FROM_ABI
+constexpr auto operator<=>(const duration<_Rep1, _Period1>& __lhs,
+                           const duration<_Rep2, _Period2>& __rhs)
+{
+    using _Ct = common_type_t<duration<_Rep1, _Period1>, duration<_Rep2, _Period2>>;
+    return _Ct(__lhs).count() <=> _Ct(__rhs).count();
+}
+
+#endif // _LIBCPP_STD_VER >= 20
+
 // Duration +
 
 template <class _Rep1, class _Period1, class _Rep2, class _Period2>
@@ -530,7 +550,7 @@
 
 } // namespace chrono
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 // Suffixes for duration literals [time.duration.literals]
 inline namespace literals
 {
@@ -609,7 +629,7 @@
    using namespace literals::chrono_literals;
 } // namespace chrono
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/file_clock.h b/third_party/llvm-project/libcxx/include/__chrono/file_clock.h
index ef62b83..7a4dce9 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/file_clock.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/file_clock.h
@@ -27,7 +27,7 @@
 _LIBCPP_END_NAMESPACE_FILESYSTEM
 #endif // !_LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -44,7 +44,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #ifndef _LIBCPP_CXX03_LANG
 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
@@ -65,7 +65,7 @@
 
   _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_FUNC_VIS static time_point now() noexcept;
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   template <class _Duration>
   _LIBCPP_HIDE_FROM_ABI
   static chrono::sys_time<_Duration> to_sys(const chrono::file_time<_Duration>& __t) {
@@ -77,7 +77,7 @@
   static chrono::file_time<_Duration> from_sys(const chrono::sys_time<_Duration>& __t) {
     return chrono::file_time<_Duration>(__t.time_since_epoch());
   }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 };
 _LIBCPP_END_NAMESPACE_FILESYSTEM
 #endif // !_LIBCPP_CXX03_LANG
diff --git a/third_party/llvm-project/libcxx/include/__chrono/formatter.h b/third_party/llvm-project/libcxx/include/__chrono/formatter.h
index 2015783..e73b043 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/formatter.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/formatter.h
@@ -11,6 +11,7 @@
 #define _LIBCPP___CHRONO_FORMATTER_H
 
 #include <__chrono/calendar.h>
+#include <__chrono/concepts.h>
 #include <__chrono/convert_to_tm.h>
 #include <__chrono/day.h>
 #include <__chrono/duration.h>
@@ -21,6 +22,7 @@
 #include <__chrono/ostream.h>
 #include <__chrono/parser_std_format_spec.h>
 #include <__chrono/statically_widen.h>
+#include <__chrono/system_clock.h>
 #include <__chrono/time_point.h>
 #include <__chrono/weekday.h>
 #include <__chrono/year.h>
@@ -50,7 +52,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 namespace __formatter {
 
@@ -75,13 +77,15 @@
 // For tiny ratios it's not possible to convert a duration to a hh_mm_ss. This
 // fails compile-time due to the limited precision of the ratio (64-bit is too
 // small). Therefore a duration uses its own conversion.
-template <class _CharT, class _Tp>
-  requires(chrono::__is_duration<_Tp>::value)
-_LIBCPP_HIDE_FROM_ABI void __format_sub_seconds(const _Tp& __value, basic_stringstream<_CharT>& __sstr) {
+template <class _CharT, class _Rep, class _Period>
+_LIBCPP_HIDE_FROM_ABI void
+__format_sub_seconds(const chrono::duration<_Rep, _Period>& __value, basic_stringstream<_CharT>& __sstr) {
   __sstr << std::use_facet<numpunct<_CharT>>(__sstr.getloc()).decimal_point();
 
+  using __duration = chrono::duration<_Rep, _Period>;
+
   auto __fraction = __value - chrono::duration_cast<chrono::seconds>(__value);
-  if constexpr (chrono::treat_as_floating_point_v<typename _Tp::rep>)
+  if constexpr (chrono::treat_as_floating_point_v<_Rep>)
     // When the floating-point value has digits itself they are ignored based
     // on the wording in [tab:time.format.spec]
     //   If the precision of the input cannot be exactly represented with
@@ -97,18 +101,43 @@
     std::format_to(std::ostreambuf_iterator<_CharT>{__sstr},
                    _LIBCPP_STATICALLY_WIDEN(_CharT, "{:0{}.0f}"),
                    __fraction.count(),
-                   chrono::hh_mm_ss<_Tp>::fractional_width);
+                   chrono::hh_mm_ss<__duration>::fractional_width);
   else
     std::format_to(std::ostreambuf_iterator<_CharT>{__sstr},
                    _LIBCPP_STATICALLY_WIDEN(_CharT, "{:0{}}"),
                    __fraction.count(),
-                   chrono::hh_mm_ss<_Tp>::fractional_width);
+                   chrono::hh_mm_ss<__duration>::fractional_width);
+}
+
+template <class _CharT, __is_time_point _Tp>
+_LIBCPP_HIDE_FROM_ABI void __format_sub_seconds(const _Tp& __value, basic_stringstream<_CharT>& __sstr) {
+  __formatter::__format_sub_seconds(__value.time_since_epoch(), __sstr);
+}
+
+template <class _CharT, class _Duration>
+_LIBCPP_HIDE_FROM_ABI void
+__format_sub_seconds(const chrono::hh_mm_ss<_Duration>& __value, basic_stringstream<_CharT>& __sstr) {
+  __sstr << std::use_facet<numpunct<_CharT>>(__sstr.getloc()).decimal_point();
+  if constexpr (chrono::treat_as_floating_point_v<typename _Duration::rep>)
+    std::format_to(std::ostreambuf_iterator<_CharT>{__sstr},
+                   _LIBCPP_STATICALLY_WIDEN(_CharT, "{:0{}.0f}"),
+                   __value.subseconds().count(),
+                   __value.fractional_width);
+  else
+    std::format_to(std::ostreambuf_iterator<_CharT>{__sstr},
+                   _LIBCPP_STATICALLY_WIDEN(_CharT, "{:0{}}"),
+                   __value.subseconds().count(),
+                   __value.fractional_width);
 }
 
 template <class _Tp>
 consteval bool __use_fraction() {
-  if constexpr (chrono::__is_duration<_Tp>::value)
+  if constexpr (__is_time_point<_Tp>)
+    return chrono::hh_mm_ss<typename _Tp::duration>::fractional_width;
+  else if constexpr (chrono::__is_duration<_Tp>::value)
     return chrono::hh_mm_ss<_Tp>::fractional_width;
+  else if constexpr (__is_hh_mm_ss<_Tp>)
+    return _Tp::fractional_width;
   else
     return false;
 }
@@ -169,7 +198,7 @@
         if (__year < 1000 || __year > 9999)
           __formatter::__format_century(__year, __sstr);
         else
-          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
       } break;
 
       case _CharT('j'):
@@ -180,7 +209,7 @@
           // an intemediate step.
           __sstr << chrono::duration_cast<chrono::days>(chrono::duration_cast<chrono::seconds>(__value)).count();
         else
-          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
         break;
 
       case _CharT('q'):
@@ -208,7 +237,7 @@
 
       case _CharT('S'):
       case _CharT('T'):
-        __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+        __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
         if constexpr (__use_fraction<_Tp>())
           __formatter::__format_sub_seconds(__value, __sstr);
         break;
@@ -252,7 +281,7 @@
         if (__year < 1000)
           __formatter::__format_year(__year, __sstr);
         else
-          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
       } break;
 
       case _CharT('F'): {
@@ -261,9 +290,14 @@
           __formatter::__format_year(__year, __sstr);
           __sstr << std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "-{:02}-{:02}"), __t.tm_mon + 1, __t.tm_mday);
         } else
-          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+          __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
       } break;
 
+      case _CharT('Z'):
+        // TODO FMT Add proper timezone support.
+        __sstr << _LIBCPP_STATICALLY_WIDEN(_CharT, "UTC");
+        break;
+
       case _CharT('O'):
         if constexpr (__use_fraction<_Tp>()) {
           // Handle OS using the normal representation for the non-fractional
@@ -271,7 +305,7 @@
           // fractional part should be formatted.
           if (*(__it + 1) == 'S') {
             ++__it;
-            __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+            __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
             __formatter::__format_sub_seconds(__value, __sstr);
             break;
           }
@@ -281,7 +315,7 @@
         ++__it;
         [[fallthrough]];
       default:
-        __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), __s, __it + 1);
+        __facet.put({__sstr}, __sstr, _CharT(' '), std::addressof(__t), std::to_address(__s), std::to_address(__it + 1));
         break;
       }
     } else {
@@ -292,7 +326,9 @@
 
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr bool __weekday_ok(const _Tp& __value) {
-  if constexpr (same_as<_Tp, chrono::day>)
+  if constexpr (__is_time_point<_Tp>)
+    return true;
+  else if constexpr (same_as<_Tp, chrono::day>)
     return true;
   else if constexpr (same_as<_Tp, chrono::month>)
     return __value.ok();
@@ -322,13 +358,17 @@
     return __value.weekday().ok();
   else if constexpr (same_as<_Tp, chrono::year_month_weekday_last>)
     return __value.weekday().ok();
+  else if constexpr (__is_hh_mm_ss<_Tp>)
+    return true;
   else
     static_assert(sizeof(_Tp) == 0, "Add the missing type specialization");
 }
 
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr bool __weekday_name_ok(const _Tp& __value) {
-  if constexpr (same_as<_Tp, chrono::day>)
+  if constexpr (__is_time_point<_Tp>)
+    return true;
+  else if constexpr (same_as<_Tp, chrono::day>)
     return true;
   else if constexpr (same_as<_Tp, chrono::month>)
     return __value.ok();
@@ -358,13 +398,17 @@
     return __value.weekday().ok();
   else if constexpr (same_as<_Tp, chrono::year_month_weekday_last>)
     return __value.weekday().ok();
+  else if constexpr (__is_hh_mm_ss<_Tp>)
+    return true;
   else
     static_assert(sizeof(_Tp) == 0, "Add the missing type specialization");
 }
 
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr bool __date_ok(const _Tp& __value) {
-  if constexpr (same_as<_Tp, chrono::day>)
+  if constexpr (__is_time_point<_Tp>)
+    return true;
+  else if constexpr (same_as<_Tp, chrono::day>)
     return true;
   else if constexpr (same_as<_Tp, chrono::month>)
     return __value.ok();
@@ -394,13 +438,17 @@
     return __value.ok();
   else if constexpr (same_as<_Tp, chrono::year_month_weekday_last>)
     return __value.ok();
+  else if constexpr (__is_hh_mm_ss<_Tp>)
+    return true;
   else
     static_assert(sizeof(_Tp) == 0, "Add the missing type specialization");
 }
 
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr bool __month_name_ok(const _Tp& __value) {
-  if constexpr (same_as<_Tp, chrono::day>)
+  if constexpr (__is_time_point<_Tp>)
+    return true;
+  else if constexpr (same_as<_Tp, chrono::day>)
     return true;
   else if constexpr (same_as<_Tp, chrono::month>)
     return __value.ok();
@@ -430,6 +478,8 @@
     return __value.month().ok();
   else if constexpr (same_as<_Tp, chrono::year_month_weekday_last>)
     return __value.month().ok();
+  else if constexpr (__is_hh_mm_ss<_Tp>)
+    return true;
   else
     static_assert(sizeof(_Tp) == 0, "Add the missing type specialization");
 }
@@ -478,6 +528,29 @@
       if (__specs.__chrono_.__month_name_ && !__formatter::__month_name_ok(__value))
         std::__throw_format_error("formatting a month name from an invalid month number");
 
+      if constexpr (__is_hh_mm_ss<_Tp>) {
+        // Note this is a pedantic intepretation of the Standard. A hh_mm_ss
+        // is no longer a time_of_day and can store an arbitrary number of
+        // hours. A number of hours in a 12 or 24 hour clock can't represent
+        // 24 hours or more. The functions std::chrono::make12 and
+        // std::chrono::make24 reaffirm this view point.
+        //
+        // Interestingly this will be the only output stream function that
+        // throws.
+        //
+        // TODO FMT The wording probably needs to be adapted to
+        // - The displayed hours is hh_mm_ss.hours() % 24
+        // - It should probably allow %j in the same fashion as duration.
+        // - The stream formatter should change its output when hours >= 24
+        //   - Write it as not valid,
+        //   - or write the number of days.
+        if (__specs.__chrono_.__hour_ && __value.hours().count() > 23)
+          std::__throw_format_error("formatting a hour needs a valid value");
+
+        if (__value.is_negative())
+          __sstr << _CharT('-');
+      }
+
       __formatter::__format_chrono_using_chrono_specs(__value, __sstr, __chrono_specs);
     }
   }
@@ -490,7 +563,7 @@
 } // namespace __formatter
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_chrono {
+struct _LIBCPP_TEMPLATE_VIS __formatter_chrono {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto __parse(
       basic_format_parse_context<_CharT>& __parse_ctx, __format_spec::__fields __fields, __format_spec::__flags __flags)
@@ -507,6 +580,17 @@
   __format_spec::__parser_chrono<_CharT> __parser_;
 };
 
+template <class _Duration, __fmt_char_type _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::sys_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
+public:
+  using _Base = __formatter_chrono<_CharT>;
+
+  _LIBCPP_HIDE_FROM_ABI constexpr auto parse(basic_format_parse_context<_CharT>& __parse_ctx)
+      -> decltype(__parse_ctx.begin()) {
+    return _Base::__parse(__parse_ctx, __format_spec::__fields_chrono, __format_spec::__flags::__clock);
+  }
+};
+
 template <class _Rep, class _Period, __fmt_char_type _CharT>
 struct formatter<chrono::duration<_Rep, _Period>, _CharT> : public __formatter_chrono<_CharT> {
 public:
@@ -530,7 +614,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -542,7 +626,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -554,7 +638,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -566,7 +650,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -578,7 +662,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday_indexed, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_indexed, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -590,7 +674,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -602,7 +686,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -614,7 +698,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_day_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -626,7 +710,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -638,7 +722,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -650,7 +734,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -662,7 +746,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -674,7 +758,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_day_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -686,7 +770,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -698,7 +782,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -709,7 +793,17 @@
   }
 };
 
-#endif // if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+template <class _Duration, __fmt_char_type _CharT>
+struct formatter<chrono::hh_mm_ss<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
+public:
+  using _Base = __formatter_chrono<_CharT>;
+
+  _LIBCPP_HIDE_FROM_ABI constexpr auto parse(basic_format_parse_context<_CharT>& __parse_ctx)
+      -> decltype(__parse_ctx.begin()) {
+    return _Base::__parse(__parse_ctx, __format_spec::__fields_chrono, __format_spec::__flags::__time);
+  }
+};
+#endif // if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/hh_mm_ss.h b/third_party/llvm-project/libcxx/include/__chrono/hh_mm_ss.h
index fd61cbe..5bd452e 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/hh_mm_ss.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/hh_mm_ss.h
@@ -13,14 +13,14 @@
 #include <__chrono/duration.h>
 #include <__chrono/time_point.h>
 #include <__config>
+#include <__type_traits/common_type.h>
 #include <ratio>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -85,6 +85,7 @@
     chrono::seconds __s_;
     precision       __f_;
 };
+_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(hh_mm_ss);
 
 _LIBCPP_HIDE_FROM_ABI constexpr bool is_am(const hours& __h) noexcept { return __h >= hours( 0) && __h < hours(12); }
 _LIBCPP_HIDE_FROM_ABI constexpr bool is_pm(const hours& __h) noexcept { return __h >= hours(12) && __h < hours(24); }
@@ -107,6 +108,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_HH_MM_SS_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/literals.h b/third_party/llvm-project/libcxx/include/__chrono/literals.h
index 50529bd..28ddc43 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/literals.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/literals.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -44,6 +44,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_LITERALS_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/month.h b/third_party/llvm-project/libcxx/include/__chrono/month.h
index e929f24..ad679e4 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/month.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/month.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -98,6 +98,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_MONTH_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/month_weekday.h b/third_party/llvm-project/libcxx/include/__chrono/month_weekday.h
index 01cdf76..802cbd7 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/month_weekday.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/month_weekday.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -101,6 +101,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_MONTH_WEEKDAY_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/monthday.h b/third_party/llvm-project/libcxx/include/__chrono/monthday.h
index c0ee3e4..961b71e 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/monthday.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/monthday.h
@@ -20,7 +20,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -124,6 +124,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_MONTHDAY_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/ostream.h b/third_party/llvm-project/libcxx/include/__chrono/ostream.h
index 30a04bd..26df882 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/ostream.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/ostream.h
@@ -12,10 +12,12 @@
 
 #include <__chrono/day.h>
 #include <__chrono/duration.h>
+#include <__chrono/hh_mm_ss.h>
 #include <__chrono/month.h>
 #include <__chrono/month_weekday.h>
 #include <__chrono/monthday.h>
 #include <__chrono/statically_widen.h>
+#include <__chrono/system_clock.h>
 #include <__chrono/weekday.h>
 #include <__chrono/year.h>
 #include <__chrono/year_month.h>
@@ -33,10 +35,16 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 namespace chrono {
 
+template <class _CharT, class _Traits, class _Duration>
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os, const sys_time<_Duration> __tp) {
+  return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%F %T}"), __tp);
+}
+
 // Depending on the type the return is a const _CharT* or a basic_string<_CharT>
 template <class _CharT, class _Period>
 _LIBCPP_HIDE_FROM_ABI auto __units_suffix() {
@@ -92,7 +100,7 @@
 }
 
 template <class _CharT, class _Traits, class _Rep, class _Period>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const duration<_Rep, _Period>& __d) {
   basic_ostringstream<_CharT, _Traits> __s;
   __s.flags(__os.flags());
@@ -103,21 +111,19 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
-operator<<(basic_ostream<_CharT, _Traits>& __os, const day& __d) {
-  return __os
-      << (__d.ok()
-              ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%d}"), __d)
-              // Note this error differs from the wording of the Standard. The
-              // Standard wording doesn't work well on AIX or Windows. There
-              // the formatted day seems to be either modulo 100 or completely
-              // omitted. Judging by the wording this is valid.
-              // TODO FMT Write a paper of file an LWG issue.
-              : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:02} is not a valid day"), static_cast<unsigned>(__d)));
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __os, const day& __d) {
+  return __os << (__d.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%d}"), __d)
+                           // Note this error differs from the wording of the Standard. The
+                           // Standard wording doesn't work well on AIX or Windows. There
+                           // the formatted day seems to be either modulo 100 or completely
+                           // omitted. Judging by the wording this is valid.
+                           // TODO FMT Write a paper of file an LWG issue.
+                           : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:02} is not a valid day"),
+                                         static_cast<unsigned>(__d)));
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month& __m) {
   return __os << (__m.ok() ? std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%b}"), __m)
                            : std::format(__os.getloc(),
@@ -126,14 +132,14 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year& __y) {
   return __os << (__y.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%Y}"), __y)
                            : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%Y} is not a valid year"), __y));
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday& __wd) {
   return __os << (__wd.ok() ? std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%a}"), __wd)
                             : std::format(__os.getloc(), // TODO FMT Standard mandated locale isn't used.
@@ -142,7 +148,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday_indexed& __wdi) {
   auto __i = __wdi.index();
   return __os << (__i >= 1 && __i <= 5
@@ -154,13 +160,13 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday_last& __wdl) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}[last]"), __wdl.weekday());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_day& __md) {
   // TODO FMT The Standard allows 30th of February to be printed.
   // It would be nice to show an error message instead.
@@ -168,47 +174,47 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_day_last& __mdl) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/last"), __mdl.month());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_weekday& __mwd) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/{:L}"), __mwd.month(), __mwd.weekday_indexed());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_weekday_last& __mwdl) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/{:L}"), __mwdl.month(), __mwdl.weekday_last());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month& __ym) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{}/{:L}"), __ym.year(), __ym.month());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_day& __ymd) {
   return __os << (__ymd.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%F}"), __ymd)
                              : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%F} is not a valid date"), __ymd));
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_day_last& __ymdl) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{}/{:L}"), __ymdl.year(), __ymdl.month_day_last());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_weekday& __ymwd) {
   return __os << std::format(
              __os.getloc(),
@@ -219,7 +225,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_weekday_last& __ymwdl) {
   return __os << std::format(
              __os.getloc(),
@@ -229,9 +235,15 @@
              __ymwdl.weekday_last());
 }
 
+template <class _CharT, class _Traits, class _Duration>
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os, const hh_mm_ss<_Duration> __hms) {
+  return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%T}"), __hms);
+}
+
 } // namespace chrono
 
-#endif //if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#endif // if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/parser_std_format_spec.h b/third_party/llvm-project/libcxx/include/__chrono/parser_std_format_spec.h
index dbcfe6d..27b8aa7 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/parser_std_format_spec.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/parser_std_format_spec.h
@@ -24,7 +24,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 namespace __format_spec {
 
@@ -137,17 +137,19 @@
 
 template <class _CharT>
 class _LIBCPP_TEMPLATE_VIS __parser_chrono {
+  using _ConstIterator = typename basic_format_parse_context<_CharT>::const_iterator;
+
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   __parse(basic_format_parse_context<_CharT>& __parse_ctx, __fields __fields, __flags __flags)
       -> decltype(__parse_ctx.begin()) {
-    const _CharT* __begin = __parser_.__parse(__parse_ctx, __fields);
-    const _CharT* __end   = __parse_ctx.end();
+    _ConstIterator __begin = __parser_.__parse(__parse_ctx, __fields);
+    _ConstIterator __end   = __parse_ctx.end();
     if (__begin == __end)
       return __begin;
 
-    const _CharT* __last = __parse_chrono_specs(__begin, __end, __flags);
-    __chrono_specs_      = basic_string_view<_CharT>{__begin, __last};
+    _ConstIterator __last = __parse_chrono_specs(__begin, __end, __flags);
+    __chrono_specs_       = basic_string_view<_CharT>{__begin, __last};
 
     return __last;
   }
@@ -156,8 +158,8 @@
   basic_string_view<_CharT> __chrono_specs_;
 
 private:
-  _LIBCPP_HIDE_FROM_ABI constexpr const _CharT*
-  __parse_chrono_specs(const _CharT* __begin, const _CharT* __end, __flags __flags) {
+  _LIBCPP_HIDE_FROM_ABI constexpr _ConstIterator
+  __parse_chrono_specs(_ConstIterator __begin, _ConstIterator __end, __flags __flags) {
     _LIBCPP_ASSERT(__begin != __end,
                    "When called with an empty input the function will cause "
                    "undefined behavior by evaluating data not in the input");
@@ -190,7 +192,7 @@
   /// \pre *__begin == '%'
   /// \post __begin points at the end parsed conversion-spec
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  __parse_conversion_spec(const _CharT*& __begin, const _CharT* __end, __flags __flags) {
+  __parse_conversion_spec(_ConstIterator& __begin, _ConstIterator __end, __flags __flags) {
     ++__begin;
     if (__begin == __end)
       std::__throw_format_error("End of input while parsing the modifier chrono conversion-spec");
@@ -212,6 +214,7 @@
     case _CharT('p'): // TODO FMT does the formater require an hour or a time?
     case _CharT('H'):
     case _CharT('I'):
+      __parser_.__hour_ = true;
       __validate_hour(__flags);
       break;
 
@@ -219,6 +222,7 @@
     case _CharT('R'):
     case _CharT('T'):
     case _CharT('X'):
+      __parser_.__hour_ = true;
       __format_spec::__validate_time(__flags);
       break;
 
@@ -304,13 +308,14 @@
   /// \pre *__begin == 'E'
   /// \post __begin is incremented by one.
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  __parse_modifier_E(const _CharT*& __begin, const _CharT* __end, __flags __flags) {
+  __parse_modifier_E(_ConstIterator& __begin, _ConstIterator __end, __flags __flags) {
     ++__begin;
     if (__begin == __end)
       std::__throw_format_error("End of input while parsing the modifier E");
 
     switch (*__begin) {
     case _CharT('X'):
+      __parser_.__hour_ = true;
       __format_spec::__validate_time(__flags);
       break;
 
@@ -343,7 +348,7 @@
   /// \pre *__begin == 'O'
   /// \post __begin is incremented by one.
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  __parse_modifier_O(const _CharT*& __begin, const _CharT* __end, __flags __flags) {
+  __parse_modifier_O(_ConstIterator& __begin, _ConstIterator __end, __flags __flags) {
     ++__begin;
     if (__begin == __end)
       std::__throw_format_error("End of input while parsing the modifier O");
@@ -359,6 +364,7 @@
 
     case _CharT('I'):
     case _CharT('H'):
+      __parser_.__hour_ = true;
       __format_spec::__validate_hour(__flags);
       break;
 
@@ -403,7 +409,7 @@
 
 } // namespace __format_spec
 
-#endif //_LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#endif //_LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/statically_widen.h b/third_party/llvm-project/libcxx/include/__chrono/statically_widen.h
index 360b6c2..cc1d586 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/statically_widen.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/statically_widen.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 #  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <__fmt_char_type _CharT>
@@ -45,7 +45,7 @@
 #    define _LIBCPP_STATICALLY_WIDEN(_CharT, __str) ::std::__statically_widen<_CharT>(__str)
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-#endif   //_LIBCPP_STD_VER > 17
+#endif   //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/system_clock.h b/third_party/llvm-project/libcxx/include/__chrono/system_clock.h
index 331db46..e8a41ce 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/system_clock.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/system_clock.h
@@ -38,7 +38,7 @@
     static time_point from_time_t(time_t __t) _NOEXCEPT;
 };
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Duration>
 using sys_time    = time_point<system_clock, _Duration>;
diff --git a/third_party/llvm-project/libcxx/include/__chrono/time_point.h b/third_party/llvm-project/libcxx/include/__chrono/time_point.h
index 8a8fa21..c148354 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/time_point.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/time_point.h
@@ -11,6 +11,8 @@
 #define _LIBCPP___CHRONO_TIME_POINT_H
 
 #include <__chrono/duration.h>
+#include <__compare/ordering.h>
+#include <__compare/three_way_comparable.h>
 #include <__config>
 #include <__type_traits/common_type.h>
 #include <__type_traits/enable_if.h>
@@ -90,7 +92,7 @@
     return time_point<_Clock, _ToDuration>(chrono::duration_cast<_ToDuration>(__t.time_since_epoch()));
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _ToDuration, class _Clock, class _Duration>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 typename enable_if
@@ -138,7 +140,7 @@
 {
     return __d >= __d.zero() ? +__d : -__d;
 }
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 // time_point ==
 
@@ -150,6 +152,8 @@
     return __lhs.time_since_epoch() == __rhs.time_since_epoch();
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 // time_point !=
 
 template <class _Clock, class _Duration1, class _Duration2>
@@ -160,6 +164,8 @@
     return !(__lhs == __rhs);
 }
 
+#endif // _LIBCPP_STD_VER <= 17
+
 // time_point <
 
 template <class _Clock, class _Duration1, class _Duration2>
@@ -200,6 +206,16 @@
     return !(__lhs < __rhs);
 }
 
+#if _LIBCPP_STD_VER >= 20
+
+template <class _Clock, class _Duration1, three_way_comparable_with<_Duration1> _Duration2>
+_LIBCPP_HIDE_FROM_ABI constexpr auto
+operator<=>(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs) {
+    return __lhs.time_since_epoch() <=> __rhs.time_since_epoch();
+}
+
+#endif // _LIBCPP_STD_VER >= 20
+
 // time_point operator+(time_point x, duration y);
 
 template <class _Clock, class _Duration1, class _Rep2, class _Period2>
diff --git a/third_party/llvm-project/libcxx/include/__chrono/weekday.h b/third_party/llvm-project/libcxx/include/__chrono/weekday.h
index e0bc8a4..ed9530f 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/weekday.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/weekday.h
@@ -20,7 +20,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -180,6 +180,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_WEEKDAY_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/year.h b/third_party/llvm-project/libcxx/include/__chrono/year.h
index 79ee8a0..d5251aa 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/year.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/year.h
@@ -22,7 +22,7 @@
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -95,7 +95,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_POP_MACROS
 
diff --git a/third_party/llvm-project/libcxx/include/__chrono/year_month.h b/third_party/llvm-project/libcxx/include/__chrono/year_month.h
index 9f1e65c..7a6acff 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/year_month.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/year_month.h
@@ -20,7 +20,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -96,6 +96,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_YEAR_MONTH_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/year_month_day.h b/third_party/llvm-project/libcxx/include/__chrono/year_month_day.h
index b749014..4d64db3 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/year_month_day.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/year_month_day.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -302,6 +302,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_YEAR_MONTH_DAY_H
diff --git a/third_party/llvm-project/libcxx/include/__chrono/year_month_weekday.h b/third_party/llvm-project/libcxx/include/__chrono/year_month_weekday.h
index 6604dea..b667120 100644
--- a/third_party/llvm-project/libcxx/include/__chrono/year_month_weekday.h
+++ b/third_party/llvm-project/libcxx/include/__chrono/year_month_weekday.h
@@ -27,7 +27,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -250,6 +250,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___CHRONO_YEAR_MONTH_WEEKDAY_H
diff --git a/third_party/llvm-project/libcxx/include/__compare/common_comparison_category.h b/third_party/llvm-project/libcxx/include/__compare/common_comparison_category.h
index 06c4b28..5fad99b 100644
--- a/third_party/llvm-project/libcxx/include/__compare/common_comparison_category.h
+++ b/third_party/llvm-project/libcxx/include/__compare/common_comparison_category.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __comp_detail {
 
@@ -65,14 +65,14 @@
 constexpr auto __get_comp_type() {
   using _CCC = _ClassifyCompCategory;
   constexpr _CCC __type_kinds[] = {_StrongOrd, __type_to_enum<_Ts>()...};
-  constexpr _CCC _Cat = __comp_detail::__compute_comp_type(__type_kinds);
-  if constexpr (_Cat == _None)
+  constexpr _CCC __cat = __comp_detail::__compute_comp_type(__type_kinds);
+  if constexpr (__cat == _None)
     return void();
-  else if constexpr (_Cat == _PartialOrd)
+  else if constexpr (__cat == _PartialOrd)
     return partial_ordering::equivalent;
-  else if constexpr (_Cat == _WeakOrd)
+  else if constexpr (__cat == _WeakOrd)
     return weak_ordering::equivalent;
-  else if constexpr (_Cat == _StrongOrd)
+  else if constexpr (__cat == _StrongOrd)
     return strong_ordering::equivalent;
   else
     static_assert(_False, "unhandled case");
@@ -88,7 +88,7 @@
 template<class... _Ts>
 using common_comparison_category_t = typename common_comparison_category<_Ts...>::type;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/compare_partial_order_fallback.h b/third_party/llvm-project/libcxx/include/__compare/compare_partial_order_fallback.h
index 06f03fe..fb2921e 100644
--- a/third_party/llvm-project/libcxx/include/__compare/compare_partial_order_fallback.h
+++ b/third_party/llvm-project/libcxx/include/__compare/compare_partial_order_fallback.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __compare_partial_order_fallback {
@@ -67,7 +67,7 @@
     inline constexpr auto compare_partial_order_fallback = __compare_partial_order_fallback::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/compare_strong_order_fallback.h b/third_party/llvm-project/libcxx/include/__compare/compare_strong_order_fallback.h
index 8693868..d84d065 100644
--- a/third_party/llvm-project/libcxx/include/__compare/compare_strong_order_fallback.h
+++ b/third_party/llvm-project/libcxx/include/__compare/compare_strong_order_fallback.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __compare_strong_order_fallback {
@@ -64,7 +64,7 @@
     inline constexpr auto compare_strong_order_fallback = __compare_strong_order_fallback::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/compare_three_way.h b/third_party/llvm-project/libcxx/include/__compare/compare_three_way.h
index fdbba04..2bc63a0 100644
--- a/third_party/llvm-project/libcxx/include/__compare/compare_three_way.h
+++ b/third_party/llvm-project/libcxx/include/__compare/compare_three_way.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 struct _LIBCPP_TEMPLATE_VIS compare_three_way
 {
@@ -34,7 +34,7 @@
     using is_transparent = void;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/compare_three_way_result.h b/third_party/llvm-project/libcxx/include/__compare/compare_three_way_result.h
index 8885d7e..632ebdc 100644
--- a/third_party/llvm-project/libcxx/include/__compare/compare_three_way_result.h
+++ b/third_party/llvm-project/libcxx/include/__compare/compare_three_way_result.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class, class, class>
 struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result { };
@@ -37,7 +37,7 @@
 template<class _Tp, class _Up = _Tp>
 using compare_three_way_result_t = typename compare_three_way_result<_Tp, _Up>::type;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/compare_weak_order_fallback.h b/third_party/llvm-project/libcxx/include/__compare/compare_weak_order_fallback.h
index f434dcb..d3ba04a 100644
--- a/third_party/llvm-project/libcxx/include/__compare/compare_weak_order_fallback.h
+++ b/third_party/llvm-project/libcxx/include/__compare/compare_weak_order_fallback.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __compare_weak_order_fallback {
@@ -64,7 +64,7 @@
     inline constexpr auto compare_weak_order_fallback = __compare_weak_order_fallback::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/is_eq.h b/third_party/llvm-project/libcxx/include/__compare/is_eq.h
index 4964892..9a82df1 100644
--- a/third_party/llvm-project/libcxx/include/__compare/is_eq.h
+++ b/third_party/llvm-project/libcxx/include/__compare/is_eq.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_eq(partial_ordering __c) noexcept { return __c == 0; }
 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_neq(partial_ordering __c) noexcept { return __c != 0; }
@@ -27,7 +27,7 @@
 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_gt(partial_ordering __c) noexcept { return __c > 0; }
 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_gteq(partial_ordering __c) noexcept { return __c >= 0; }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/ordering.h b/third_party/llvm-project/libcxx/include/__compare/ordering.h
index ff148ab..c348f04 100644
--- a/third_party/llvm-project/libcxx/include/__compare/ordering.h
+++ b/third_party/llvm-project/libcxx/include/__compare/ordering.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // exposition only
 enum class _LIBCPP_ENUM_VIS _OrdResult : signed char {
@@ -40,7 +40,7 @@
 inline constexpr bool __one_of_v = (is_same_v<_Tp, _Args> || ...);
 
 struct _CmpUnspecifiedParam {
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEVAL
+  _LIBCPP_HIDE_FROM_ABI constexpr
   _CmpUnspecifiedParam(int _CmpUnspecifiedParam::*) noexcept {}
 
   template<class _Tp, class = enable_if_t<!__one_of_v<_Tp, int, partial_ordering, weak_ordering, strong_ordering>>>
@@ -319,7 +319,7 @@
 template <class _Tp>
 concept __comparison_category = __one_of_v<_Tp, partial_ordering, weak_ordering, strong_ordering>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/partial_order.h b/third_party/llvm-project/libcxx/include/__compare/partial_order.h
index aee07eb..9cb76cc 100644
--- a/third_party/llvm-project/libcxx/include/__compare/partial_order.h
+++ b/third_party/llvm-project/libcxx/include/__compare/partial_order.h
@@ -24,7 +24,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __partial_order {
@@ -67,7 +67,7 @@
     inline constexpr auto partial_order = __partial_order::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/strong_order.h b/third_party/llvm-project/libcxx/include/__compare/strong_order.h
index 05856c2..b6e0cfa 100644
--- a/third_party/llvm-project/libcxx/include/__compare/strong_order.h
+++ b/third_party/llvm-project/libcxx/include/__compare/strong_order.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __strong_order {
@@ -130,7 +130,7 @@
     inline constexpr auto strong_order = __strong_order::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/synth_three_way.h b/third_party/llvm-project/libcxx/include/__compare/synth_three_way.h
index 7d33898..6420d13 100644
--- a/third_party/llvm-project/libcxx/include/__compare/synth_three_way.h
+++ b/third_party/llvm-project/libcxx/include/__compare/synth_three_way.h
@@ -21,30 +21,36 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [expos.only.func]
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr auto __synth_three_way =
-  []<class _Tp, class _Up>(const _Tp& __t, const _Up& __u)
-    requires requires {
-      { __t < __u } -> __boolean_testable;
-      { __u < __t } -> __boolean_testable;
-    }
-  {
-    if constexpr (three_way_comparable_with<_Tp, _Up>) {
-      return __t <=> __u;
-    } else {
-      if (__t < __u) return weak_ordering::less;
-      if (__u < __t) return weak_ordering::greater;
-      return weak_ordering::equivalent;
-    }
-  };
+// TODO MODULES restore the lamba to match the Standard.
+// See https://github.com/llvm/llvm-project/issues/57222
+//_LIBCPP_HIDE_FROM_ABI inline constexpr auto __synth_three_way =
+//  []<class _Tp, class _Up>(const _Tp& __t, const _Up& __u)
+template <class _Tp, class _Up>
+_LIBCPP_HIDE_FROM_ABI constexpr auto __synth_three_way(const _Tp& __t, const _Up& __u)
+  requires requires {
+    { __t < __u } -> __boolean_testable;
+    { __u < __t } -> __boolean_testable;
+  }
+{
+  if constexpr (three_way_comparable_with<_Tp, _Up>) {
+    return __t <=> __u;
+  } else {
+    if (__t < __u)
+      return weak_ordering::less;
+    if (__u < __t)
+      return weak_ordering::greater;
+    return weak_ordering::equivalent;
+  }
+}
 
 template <class _Tp, class _Up = _Tp>
 using __synth_three_way_result = decltype(std::__synth_three_way(std::declval<_Tp&>(), std::declval<_Up&>()));
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/three_way_comparable.h b/third_party/llvm-project/libcxx/include/__compare/three_way_comparable.h
index 6c98916..2b77bc3 100644
--- a/third_party/llvm-project/libcxx/include/__compare/three_way_comparable.h
+++ b/third_party/llvm-project/libcxx/include/__compare/three_way_comparable.h
@@ -25,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class _Tp, class _Cat>
 concept __compares_as =
@@ -52,7 +52,7 @@
     { __u <=> __t } -> __compares_as<_Cat>;
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__compare/weak_order.h b/third_party/llvm-project/libcxx/include/__compare/weak_order.h
index abb24e3..9cbc1d2 100644
--- a/third_party/llvm-project/libcxx/include/__compare/weak_order.h
+++ b/third_party/llvm-project/libcxx/include/__compare/weak_order.h
@@ -24,7 +24,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [cmp.alg]
 namespace __weak_order {
@@ -95,7 +95,7 @@
     inline constexpr auto weak_order = __weak_order::__fn{};
 } // namespace __cpo
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/arithmetic.h b/third_party/llvm-project/libcxx/include/__concepts/arithmetic.h
index 215b52a..91a0b18 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/arithmetic.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/arithmetic.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concepts.arithmetic], arithmetic concepts
 
@@ -45,7 +45,7 @@
 template <class _Tp>
 concept __libcpp_signed_integer = __libcpp_is_signed_integer<_Tp>::value;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/assignable.h b/third_party/llvm-project/libcxx/include/__concepts/assignable.h
index 91edd40..2dabae5 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/assignable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/assignable.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.assignable]
 
@@ -34,7 +34,7 @@
     { __lhs = _VSTD::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/boolean_testable.h b/third_party/llvm-project/libcxx/include/__concepts/boolean_testable.h
index a96bde7..8efb6e5 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/boolean_testable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/boolean_testable.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concepts.booleantestable]
 
@@ -31,7 +31,7 @@
   { !_VSTD::forward<_Tp>(__t) } -> __boolean_testable_impl;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/class_or_enum.h b/third_party/llvm-project/libcxx/include/__concepts/class_or_enum.h
index c4d2f98..04c24bd 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/class_or_enum.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/class_or_enum.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // Whether a type is a class type or enumeration type according to the Core wording.
 
@@ -33,7 +33,7 @@
 template<class _Tp>
 concept __workaround_52970 = is_class_v<__remove_cvref_t<_Tp>> || is_union_v<__remove_cvref_t<_Tp>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/common_reference_with.h b/third_party/llvm-project/libcxx/include/__concepts/common_reference_with.h
index cc92762..6ad0db2 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/common_reference_with.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/common_reference_with.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.commonref]
 
@@ -30,7 +30,7 @@
   convertible_to<_Tp, common_reference_t<_Tp, _Up>> &&
   convertible_to<_Up, common_reference_t<_Tp, _Up>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/common_with.h b/third_party/llvm-project/libcxx/include/__concepts/common_with.h
index 569a0ee..e159bcc 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/common_with.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/common_with.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.common]
 
@@ -43,7 +43,7 @@
       add_lvalue_reference_t<const _Tp>,
       add_lvalue_reference_t<const _Up>>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/constructible.h b/third_party/llvm-project/libcxx/include/__concepts/constructible.h
index 1d78eb5..6e3862c 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/constructible.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/constructible.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.constructible]
 template<class _Tp, class... _Args>
@@ -49,7 +49,7 @@
   constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> &&
   constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/convertible_to.h b/third_party/llvm-project/libcxx/include/__concepts/convertible_to.h
index 2c1d267..20ee31b 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/convertible_to.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/convertible_to.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.convertible]
 
@@ -30,7 +30,7 @@
     static_cast<_To>(std::declval<_From>());
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/copyable.h b/third_party/llvm-project/libcxx/include/__concepts/copyable.h
index c5d8a80..0d6dd50 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/copyable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/copyable.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concepts.object]
 
@@ -32,7 +32,7 @@
   assignable_from<_Tp&, const _Tp&> &&
   assignable_from<_Tp&, const _Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/derived_from.h b/third_party/llvm-project/libcxx/include/__concepts/derived_from.h
index 0d3462d..1cbe458 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/derived_from.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/derived_from.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.derived]
 
@@ -28,7 +28,7 @@
   is_base_of_v<_Bp, _Dp> &&
   is_convertible_v<const volatile _Dp*, const volatile _Bp*>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/destructible.h b/third_party/llvm-project/libcxx/include/__concepts/destructible.h
index ad3819d..8da9c37 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/destructible.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/destructible.h
@@ -18,14 +18,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.destructible]
 
 template<class _Tp>
 concept destructible = is_nothrow_destructible_v<_Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/different_from.h b/third_party/llvm-project/libcxx/include/__concepts/different_from.h
index 15fd8f0..5ef1467 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/different_from.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/different_from.h
@@ -19,12 +19,12 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class _Tp, class _Up>
 concept __different_from = !same_as<remove_cvref_t<_Tp>, remove_cvref_t<_Up>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/equality_comparable.h b/third_party/llvm-project/libcxx/include/__concepts/equality_comparable.h
index b865141..f106288 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/equality_comparable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/equality_comparable.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.equalitycomparable]
 
@@ -47,7 +47,7 @@
       __make_const_lvalue_ref<_Up>>> &&
   __weakly_equality_comparable_with<_Tp, _Up>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/invocable.h b/third_party/llvm-project/libcxx/include/__concepts/invocable.h
index ec39b7b..59eab01 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/invocable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/invocable.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.invocable]
 
@@ -33,7 +33,7 @@
 template<class _Fn, class... _Args>
 concept regular_invocable = invocable<_Fn, _Args...>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/movable.h b/third_party/llvm-project/libcxx/include/__concepts/movable.h
index 749b78a..f37d49f 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/movable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/movable.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concepts.object]
 
@@ -32,7 +32,7 @@
   assignable_from<_Tp&, _Tp> &&
   swappable<_Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/predicate.h b/third_party/llvm-project/libcxx/include/__concepts/predicate.h
index 7ae9783..b09183c 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/predicate.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/predicate.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.predicate]
 
@@ -28,7 +28,7 @@
 concept predicate =
   regular_invocable<_Fn, _Args...> && __boolean_testable<invoke_result_t<_Fn, _Args...>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/regular.h b/third_party/llvm-project/libcxx/include/__concepts/regular.h
index d15728d..93fb701 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/regular.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/regular.h
@@ -19,14 +19,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.object]
 
 template<class _Tp>
 concept regular = semiregular<_Tp> && equality_comparable<_Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/relation.h b/third_party/llvm-project/libcxx/include/__concepts/relation.h
index 7d5141c..218afef 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/relation.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/relation.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.relation]
 
@@ -37,7 +37,7 @@
 template<class _Rp, class _Tp, class _Up>
 concept strict_weak_order = relation<_Rp, _Tp, _Up>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/same_as.h b/third_party/llvm-project/libcxx/include/__concepts/same_as.h
index 554ebc3..b86cada 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/same_as.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/same_as.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.same]
 
@@ -28,7 +28,7 @@
 template<class _Tp, class _Up>
 concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/semiregular.h b/third_party/llvm-project/libcxx/include/__concepts/semiregular.h
index d15bb3b..ae2f3c6 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/semiregular.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/semiregular.h
@@ -19,14 +19,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.object]
 
 template<class _Tp>
 concept semiregular = copyable<_Tp> && default_initializable<_Tp>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/swappable.h b/third_party/llvm-project/libcxx/include/__concepts/swappable.h
index d91a7a1..340691d 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/swappable.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/swappable.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.swappable]
 
@@ -114,7 +114,7 @@
     ranges::swap(_VSTD::forward<_Up>(__u), _VSTD::forward<_Tp>(__t));
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__concepts/totally_ordered.h b/third_party/llvm-project/libcxx/include/__concepts/totally_ordered.h
index f12d26b..350eff3 100644
--- a/third_party/llvm-project/libcxx/include/__concepts/totally_ordered.h
+++ b/third_party/llvm-project/libcxx/include/__concepts/totally_ordered.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [concept.totallyordered]
 
@@ -51,7 +51,7 @@
       __make_const_lvalue_ref<_Up>>> &&
   __partially_ordered_with<_Tp, _Up>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__condition_variable/condition_variable.h b/third_party/llvm-project/libcxx/include/__condition_variable/condition_variable.h
new file mode 100644
index 0000000..10b0662
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__condition_variable/condition_variable.h
@@ -0,0 +1,243 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
+#define _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
+
+#include <__chrono/steady_clock.h>
+#include <__chrono/system_clock.h>
+#include <__chrono/time_point.h>
+#include <__config>
+#include <__mutex/mutex.h>
+#include <__mutex/unique_lock.h>
+#include <__system_error/system_error.h>
+#include <__threading_support>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_floating_point.h>
+#include <__utility/move.h>
+#include <ratio>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+// enum class cv_status
+_LIBCPP_DECLARE_STRONG_ENUM(cv_status){no_timeout, timeout};
+_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status)
+
+class _LIBCPP_TYPE_VIS condition_variable {
+  __libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR condition_variable() _NOEXCEPT = default;
+
+#  ifdef _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
+  ~condition_variable() = default;
+#  else
+  ~condition_variable();
+#  endif
+
+  condition_variable(const condition_variable&)            = delete;
+  condition_variable& operator=(const condition_variable&) = delete;
+
+  void notify_one() _NOEXCEPT;
+  void notify_all() _NOEXCEPT;
+
+  void wait(unique_lock<mutex>& __lk) _NOEXCEPT;
+  template <class _Predicate>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS void wait(unique_lock<mutex>& __lk, _Predicate __pred);
+
+  template <class _Clock, class _Duration>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS cv_status
+  wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t);
+
+  template <class _Clock, class _Duration, class _Predicate>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS bool
+  wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred);
+
+  template <class _Rep, class _Period>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS cv_status
+  wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d);
+
+  template <class _Rep, class _Period, class _Predicate>
+  bool _LIBCPP_HIDE_FROM_ABI
+  wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred);
+
+  typedef __libcpp_condvar_t* native_handle_type;
+  _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return &__cv_; }
+
+private:
+  void
+  __do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<chrono::system_clock, chrono::nanoseconds>) _NOEXCEPT;
+#  if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
+  void
+  __do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<chrono::steady_clock, chrono::nanoseconds>) _NOEXCEPT;
+#  endif
+  template <class _Clock>
+  void __do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<_Clock, chrono::nanoseconds>) _NOEXCEPT;
+};
+#endif // !_LIBCPP_HAS_NO_THREADS
+
+template <class _Rep, class _Period>
+inline _LIBCPP_HIDE_FROM_ABI __enable_if_t<is_floating_point<_Rep>::value, chrono::nanoseconds>
+__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) {
+  using namespace chrono;
+  using __ratio       = ratio_divide<_Period, nano>;
+  using __ns_rep      = nanoseconds::rep;
+  _Rep __result_float = __d.count() * __ratio::num / __ratio::den;
+
+  _Rep __result_max = numeric_limits<__ns_rep>::max();
+  if (__result_float >= __result_max) {
+    return nanoseconds::max();
+  }
+
+  _Rep __result_min = numeric_limits<__ns_rep>::min();
+  if (__result_float <= __result_min) {
+    return nanoseconds::min();
+  }
+
+  return nanoseconds(static_cast<__ns_rep>(__result_float));
+}
+
+template <class _Rep, class _Period>
+inline _LIBCPP_HIDE_FROM_ABI __enable_if_t<!is_floating_point<_Rep>::value, chrono::nanoseconds>
+__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) {
+  using namespace chrono;
+  if (__d.count() == 0) {
+    return nanoseconds(0);
+  }
+
+  using __ratio         = ratio_divide<_Period, nano>;
+  using __ns_rep        = nanoseconds::rep;
+  __ns_rep __result_max = numeric_limits<__ns_rep>::max();
+  if (__d.count() > 0 && __d.count() > __result_max / __ratio::num) {
+    return nanoseconds::max();
+  }
+
+  __ns_rep __result_min = numeric_limits<__ns_rep>::min();
+  if (__d.count() < 0 && __d.count() < __result_min / __ratio::num) {
+    return nanoseconds::min();
+  }
+
+  __ns_rep __result = __d.count() * __ratio::num / __ratio::den;
+  if (__result == 0) {
+    return nanoseconds(1);
+  }
+
+  return nanoseconds(__result);
+}
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+template <class _Predicate>
+void condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) {
+  while (!__pred())
+    wait(__lk);
+}
+
+template <class _Clock, class _Duration>
+cv_status condition_variable::wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t) {
+  using namespace chrono;
+  using __clock_tp_ns = time_point<_Clock, nanoseconds>;
+
+  typename _Clock::time_point __now = _Clock::now();
+  if (__t <= __now)
+    return cv_status::timeout;
+
+  __clock_tp_ns __t_ns = __clock_tp_ns(std::__safe_nanosecond_cast(__t.time_since_epoch()));
+
+  __do_timed_wait(__lk, __t_ns);
+  return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
+}
+
+template <class _Clock, class _Duration, class _Predicate>
+bool condition_variable::wait_until(
+    unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred) {
+  while (!__pred()) {
+    if (wait_until(__lk, __t) == cv_status::timeout)
+      return __pred();
+  }
+  return true;
+}
+
+template <class _Rep, class _Period>
+cv_status condition_variable::wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d) {
+  using namespace chrono;
+  if (__d <= __d.zero())
+    return cv_status::timeout;
+  using __ns_rep                   = nanoseconds::rep;
+  steady_clock::time_point __c_now = steady_clock::now();
+
+#  if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
+  using __clock_tp_ns     = time_point<steady_clock, nanoseconds>;
+  __ns_rep __now_count_ns = std::__safe_nanosecond_cast(__c_now.time_since_epoch()).count();
+#  else
+  using __clock_tp_ns     = time_point<system_clock, nanoseconds>;
+  __ns_rep __now_count_ns = std::__safe_nanosecond_cast(system_clock::now().time_since_epoch()).count();
+#  endif
+
+  __ns_rep __d_ns_count = std::__safe_nanosecond_cast(__d).count();
+
+  if (__now_count_ns > numeric_limits<__ns_rep>::max() - __d_ns_count) {
+    __do_timed_wait(__lk, __clock_tp_ns::max());
+  } else {
+    __do_timed_wait(__lk, __clock_tp_ns(nanoseconds(__now_count_ns + __d_ns_count)));
+  }
+
+  return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : cv_status::timeout;
+}
+
+template <class _Rep, class _Period, class _Predicate>
+inline bool
+condition_variable::wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred) {
+  return wait_until(__lk, chrono::steady_clock::now() + __d, std::move(__pred));
+}
+
+#  if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
+inline void condition_variable::__do_timed_wait(
+    unique_lock<mutex>& __lk, chrono::time_point<chrono::steady_clock, chrono::nanoseconds> __tp) _NOEXCEPT {
+  using namespace chrono;
+  if (!__lk.owns_lock())
+    __throw_system_error(EPERM, "condition_variable::timed wait: mutex not locked");
+  nanoseconds __d = __tp.time_since_epoch();
+  timespec __ts;
+  seconds __s                 = duration_cast<seconds>(__d);
+  using __ts_sec              = decltype(__ts.tv_sec);
+  const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max();
+  if (__s.count() < __ts_sec_max) {
+    __ts.tv_sec  = static_cast<__ts_sec>(__s.count());
+    __ts.tv_nsec = (__d - __s).count();
+  } else {
+    __ts.tv_sec  = __ts_sec_max;
+    __ts.tv_nsec = giga::num - 1;
+  }
+  int __ec = pthread_cond_clockwait(&__cv_, __lk.mutex()->native_handle(), CLOCK_MONOTONIC, &__ts);
+  if (__ec != 0 && __ec != ETIMEDOUT)
+    __throw_system_error(__ec, "condition_variable timed_wait failed");
+}
+#  endif // _LIBCPP_HAS_COND_CLOCKWAIT
+
+template <class _Clock>
+inline void condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
+                                                chrono::time_point<_Clock, chrono::nanoseconds> __tp) _NOEXCEPT {
+  wait_for(__lk, __tp - _Clock::now());
+}
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
diff --git a/third_party/llvm-project/libcxx/include/__config b/third_party/llvm-project/libcxx/include/__config
index 40c9deb..6716058 100644
--- a/third_party/llvm-project/libcxx/include/__config
+++ b/third_party/llvm-project/libcxx/include/__config
@@ -23,6 +23,7 @@
 #endif
 
 #if defined(__apple_build_version__)
+// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
 #  define _LIBCPP_COMPILER_CLANG_BASED
 #  define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000)
 #elif defined(__clang__)
@@ -50,6 +51,7 @@
 #    define _LIBCPP_FREESTANDING
 #  endif
 
+// NOLINTBEGIN(libcpp-cpp-version-check)
 #  ifndef _LIBCPP_STD_VER
 #    if __cplusplus <= 201103L
 #      define _LIBCPP_STD_VER 11
@@ -64,6 +66,7 @@
 #      define _LIBCPP_STD_VER 23
 #    endif
 #  endif // _LIBCPP_STD_VER
+// NOLINTEND(libcpp-cpp-version-check)
 
 #  if defined(__ELF__)
 #    define _LIBCPP_OBJECT_FORMAT_ELF 1
@@ -134,6 +137,15 @@
 #    define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON
 // According to the Standard, `bitset::operator[] const` returns bool
 #    define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
+// Fix the implementation of CityHash used for std::hash<fundamental-type>.
+// This is an ABI break because `std::hash` will return a different result,
+// which means that hashing the same object in translation units built against
+// different versions of libc++ can return inconsistent results. This is especially
+// tricky since std::hash is used in the implementation of unordered containers.
+//
+// The incorrect implementation of CityHash has the problem that it drops some
+// bits on the floor.
+#    define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION
 // Remove the base 10 implementation of std::to_chars from the dylib.
 // The implementation moved to the header, but we still export the symbols from
 // the dylib for backwards compatibility.
@@ -155,6 +167,12 @@
 #    if defined(__FreeBSD__)
 #      define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
 #    endif
+// For XCOFF linkers, we have problems if we see a weak hidden version of a symbol
+// in user code (like you get with -fvisibility-inlines-hidden) and then a strong def
+// in the library, so we need to always rely on the library version.
+#    if defined(_AIX)
+#      define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
+#    endif
 #  endif
 
 #  if defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_ABI_VERSION >= 2
@@ -172,6 +190,7 @@
 #  define _LIBCPP_TOSTRING2(x) #x
 #  define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
 
+// NOLINTNEXTLINE(libcpp-cpp-version-check)
 #  if __cplusplus < 201103L
 #    define _LIBCPP_CXX03_LANG
 #  endif
@@ -439,7 +458,7 @@
 #  endif
 
 #  if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L
-#    define _LIBCPP_NO_EXCEPTIONS
+#    define _LIBCPP_HAS_NO_EXCEPTIONS
 #  endif
 
 #  define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
@@ -656,7 +675,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
 
-#  if _LIBCPP_STD_VER > 14
+#  if _LIBCPP_STD_VER >= 17
 #    define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM                                                                         \
        _LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem {
 #  else
@@ -677,12 +696,6 @@
 #    define _LIBCPP_HAS_NO_INT128
 #  endif
 
-#  ifndef __cpp_consteval
-#    define _LIBCPP_CONSTEVAL _LIBCPP_CONSTEXPR
-#  else
-#    define _LIBCPP_CONSTEVAL consteval
-#  endif
-
 #  if __has_attribute(__malloc__)
 #    define _LIBCPP_NOALIAS __attribute__((__malloc__))
 #  else
@@ -767,10 +780,10 @@
 // Deprecations warnings are always enabled, except when users explicitly opt-out
 // by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
 #  if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
-#    if __has_attribute(deprecated)
-#      define _LIBCPP_DEPRECATED __attribute__((deprecated))
-#      define _LIBCPP_DEPRECATED_(m) __attribute__((deprecated(m)))
-#    elif _LIBCPP_STD_VER > 11
+#    if __has_attribute(__deprecated__)
+#      define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
+#      define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m)))
+#    elif _LIBCPP_STD_VER >= 14
 #      define _LIBCPP_DEPRECATED [[deprecated]]
 #      define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]]
 #    else
@@ -788,19 +801,19 @@
 #    define _LIBCPP_DEPRECATED_IN_CXX11
 #  endif
 
-#  if _LIBCPP_STD_VER > 11
+#  if _LIBCPP_STD_VER >= 14
 #    define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX14
 #  endif
 
-#  if _LIBCPP_STD_VER > 14
+#  if _LIBCPP_STD_VER >= 17
 #    define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX17
 #  endif
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX20
@@ -830,37 +843,43 @@
 #  endif
 
 #  if _LIBCPP_STD_VER <= 11
-#    define _LIBCPP_EXPLICIT_AFTER_CXX11
+#    define _LIBCPP_EXPLICIT_SINCE_CXX14
 #  else
-#    define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit
+#    define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit
 #  endif
 
-#  if _LIBCPP_STD_VER > 11
+#  if _LIBCPP_STD_VER >= 23
+#    define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit
+#  else
+#    define _LIBCPP_EXPLICIT_SINCE_CXX23
+#  endif
+
+#  if _LIBCPP_STD_VER >= 14
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX14
 #  endif
 
-#  if _LIBCPP_STD_VER > 14
+#  if _LIBCPP_STD_VER >= 17
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX17
 #  endif
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX20
 #  endif
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX23
 #  endif
 
 #  if __has_cpp_attribute(nodiscard)
-#    define _LIBCPP_NODISCARD [[nodiscard]]
+#    define _LIBCPP_NODISCARD [[__nodiscard__]]
 #  else
 // We can't use GCC's [[gnu::warn_unused_result]] and
 // __attribute__((warn_unused_result)), because GCC does not silence them via
@@ -876,7 +895,7 @@
 #    define _LIBCPP_NODISCARD_EXT
 #  endif
 
-#  if _LIBCPP_STD_VER > 17 || !defined(_LIBCPP_DISABLE_NODISCARD_EXT)
+#  if _LIBCPP_STD_VER >= 20 || !defined(_LIBCPP_DISABLE_NODISCARD_EXT)
 #    define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD
 #  else
 #    define _LIBCPP_NODISCARD_AFTER_CXX17
@@ -895,7 +914,7 @@
 
 // Try to find out if RTTI is disabled.
 #  if !defined(__cpp_rtti) || __cpp_rtti < 199711L
-#    define _LIBCPP_NO_RTTI
+#    define _LIBCPP_HAS_NO_RTTI
 #  endif
 
 #  ifndef _LIBCPP_WEAK
@@ -1042,7 +1061,7 @@
 #    define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)
 #  endif
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_CONSTINIT constinit
 #  elif __has_attribute(__require_constant_initialization__)
 #    define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__))
@@ -1179,7 +1198,7 @@
 // [[msvc::no_unique_address]], this should be preferred though.
 #    define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
 #  elif __has_cpp_attribute(no_unique_address)
-#    define _LIBCPP_NO_UNIQUE_ADDRESS [[no_unique_address]]
+#    define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]]
 #  else
 #    define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */
 // Note that this can be replaced by #error as soon as clang-cl
@@ -1227,12 +1246,12 @@
 // functions are declared by the C library.
 #  define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8
 // GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if
-// __cpp_char8_t is defined or if C2X extensions are enabled. Unfortunately,
-// determining the latter depends on internal GNU libc details. If the
-// __cpp_char8_t feature test macro is not defined, then a char8_t typedef
-// will be declared as well.
-#  if defined(_LIBCPP_GLIBC_PREREQ) && defined(__GLIBC_USE)
-#    if _LIBCPP_GLIBC_PREREQ(2, 36) && (defined(__cpp_char8_t) || __GLIBC_USE(ISOC2X))
+// __cpp_char8_t is defined or if C2X extensions are enabled. Determining
+// the latter depends on internal GNU libc details that are not appropriate
+// to depend on here, so any declarations present when __cpp_char8_t is not
+// defined are ignored.
+#  if defined(_LIBCPP_GLIBC_PREREQ)
+#    if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)
 #      undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8
 #    endif
 #  endif
@@ -1242,13 +1261,25 @@
 // macro is used to mark them as such, which suppresses the
 // '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code
 // with these classes.
-#if _LIBCPP_STD_VER >= 17
-#    define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName)                                                                \
-      template <class ..._Tag>                                                                                         \
-      _ClassName(typename _Tag::__allow_ctad...) -> _ClassName<_Tag...>
-#else
-#  define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")
-#endif
+#  if _LIBCPP_STD_VER >= 17
+#    ifdef _LIBCPP_COMPILER_CLANG_BASED
+#      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName)                                                              \
+        template <class... _Tag>                                                                                       \
+        [[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...>
+#    else
+#      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName)                                                               \
+        template <class... _Tag>                                                                                       \
+        ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...>
+#    endif
+#  else
+#    define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")
+#  endif
+
+// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use
+// compiler intrinsics in the Objective-C++ mode.
+#  ifdef __OBJC__
+#    define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS
+#  endif
 
 #endif // __cplusplus
 
diff --git a/third_party/llvm-project/libcxx/include/__coroutine/coroutine_handle.h b/third_party/llvm-project/libcxx/include/__coroutine/coroutine_handle.h
index 0a6cc1c..8390b49 100644
--- a/third_party/llvm-project/libcxx/include/__coroutine/coroutine_handle.h
+++ b/third_party/llvm-project/libcxx/include/__coroutine/coroutine_handle.h
@@ -21,7 +21,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -198,6 +198,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // __LIBCPP_STD_VER > 17
+#endif // __LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___COROUTINE_COROUTINE_HANDLE_H
diff --git a/third_party/llvm-project/libcxx/include/__coroutine/coroutine_traits.h b/third_party/llvm-project/libcxx/include/__coroutine/coroutine_traits.h
index d513075..7122cc8 100644
--- a/third_party/llvm-project/libcxx/include/__coroutine/coroutine_traits.h
+++ b/third_party/llvm-project/libcxx/include/__coroutine/coroutine_traits.h
@@ -16,7 +16,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -48,6 +48,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // __LIBCPP_STD_VER > 17
+#endif // __LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___COROUTINE_COROUTINE_TRAITS_H
diff --git a/third_party/llvm-project/libcxx/include/__coroutine/noop_coroutine_handle.h b/third_party/llvm-project/libcxx/include/__coroutine/noop_coroutine_handle.h
index 2993047..9b7802d 100644
--- a/third_party/llvm-project/libcxx/include/__coroutine/noop_coroutine_handle.h
+++ b/third_party/llvm-project/libcxx/include/__coroutine/noop_coroutine_handle.h
@@ -16,7 +16,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -107,6 +107,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // __LIBCPP_STD_VER > 17
+#endif // __LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP___COROUTINE_NOOP_COROUTINE_HANDLE_H
diff --git a/third_party/llvm-project/libcxx/include/__coroutine/trivial_awaitables.h b/third_party/llvm-project/libcxx/include/__coroutine/trivial_awaitables.h
index bbbae7a..0e4b08e 100644
--- a/third_party/llvm-project/libcxx/include/__coroutine/trivial_awaitables.h
+++ b/third_party/llvm-project/libcxx/include/__coroutine/trivial_awaitables.h
@@ -16,7 +16,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -41,6 +41,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // __LIBCPP_STD_VER > 17
+#endif // __LIBCPP_STD_VER >= 20
 
 #endif // __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H
diff --git a/third_party/llvm-project/libcxx/include/__debug b/third_party/llvm-project/libcxx/include/__debug
index 140cc91..ccbfae7 100644
--- a/third_party/llvm-project/libcxx/include/__debug
+++ b/third_party/llvm-project/libcxx/include/__debug
@@ -98,8 +98,8 @@
 {
     typedef typename _Cont::const_iterator iterator;
     const iterator* __j = static_cast<const iterator*>(__i);
-    _Cont* _Cp = static_cast<_Cont*>(__c_);
-    return _Cp->__dereferenceable(__j);
+    _Cont* __cp = static_cast<_Cont*>(__c_);
+    return __cp->__dereferenceable(__j);
 }
 
 template <class _Cont>
@@ -108,8 +108,8 @@
 {
     typedef typename _Cont::const_iterator iterator;
     const iterator* __j = static_cast<const iterator*>(__i);
-    _Cont* _Cp = static_cast<_Cont*>(__c_);
-    return _Cp->__decrementable(__j);
+    _Cont* __cp = static_cast<_Cont*>(__c_);
+    return __cp->__decrementable(__j);
 }
 
 template <class _Cont>
@@ -118,8 +118,8 @@
 {
     typedef typename _Cont::const_iterator iterator;
     const iterator* __j = static_cast<const iterator*>(__i);
-    _Cont* _Cp = static_cast<_Cont*>(__c_);
-    return _Cp->__addable(__j, __n);
+    _Cont* __cp = static_cast<_Cont*>(__c_);
+    return __cp->__addable(__j, __n);
 }
 
 template <class _Cont>
@@ -128,8 +128,8 @@
 {
     typedef typename _Cont::const_iterator iterator;
     const iterator* __j = static_cast<const iterator*>(__i);
-    _Cont* _Cp = static_cast<_Cont*>(__c_);
-    return _Cp->__subscriptable(__j, __n);
+    _Cont* __cp = static_cast<_Cont*>(__c_);
+    return __cp->__subscriptable(__j, __n);
 }
 
 class _LIBCPP_TYPE_VIS __libcpp_db
diff --git a/third_party/llvm-project/libcxx/include/__exception/exception.h b/third_party/llvm-project/libcxx/include/__exception/exception.h
new file mode 100644
index 0000000..49a58dd
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__exception/exception.h
@@ -0,0 +1,91 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___EXCEPTION_EXCEPTION_H
+#define _LIBCPP___EXCEPTION_EXCEPTION_H
+
+#include <__config>
+
+// <vcruntime_exception.h> defines its own std::exception and std::bad_exception types,
+// which we use in order to be ABI-compatible with other STLs on Windows.
+#if defined(_LIBCPP_ABI_VCRUNTIME)
+#  include <vcruntime_exception.h>
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+namespace std { // purposefully not using versioning namespace
+
+#if defined(_LIBCPP_ABI_VCRUNTIME) && (!defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS != 0)
+// The std::exception class was already included above, but we're explicit about this condition here for clarity.
+
+#elif defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0
+// However, <vcruntime_exception.h> does not define std::exception and std::bad_exception
+// when _HAS_EXCEPTIONS == 0.
+//
+// Since libc++ still wants to provide the std::exception hierarchy even when _HAS_EXCEPTIONS == 0
+// (after all those are simply types like any other), we define an ABI-compatible version
+// of the VCRuntime std::exception and std::bad_exception types in that mode.
+
+struct __std_exception_data {
+  char const* _What;
+  bool _DoFree;
+};
+
+class exception { // base of all library exceptions
+public:
+  exception() _NOEXCEPT : __data_() {}
+
+  explicit exception(char const* __message) _NOEXCEPT : __data_() {
+    __data_._What   = __message;
+    __data_._DoFree = true;
+  }
+
+  exception(exception const&) _NOEXCEPT {}
+
+  exception& operator=(exception const&) _NOEXCEPT { return *this; }
+
+  virtual ~exception() _NOEXCEPT {}
+
+  virtual char const* what() const _NOEXCEPT { return __data_._What ? __data_._What : "Unknown exception"; }
+
+private:
+  __std_exception_data __data_;
+};
+
+class bad_exception : public exception {
+public:
+  bad_exception() _NOEXCEPT : exception("bad exception") {}
+};
+
+#else  // !defined(_LIBCPP_ABI_VCRUNTIME)
+// On all other platforms, we define our own std::exception and std::bad_exception types
+// regardless of whether exceptions are turned on as a language feature.
+
+class _LIBCPP_EXCEPTION_ABI exception {
+public:
+  _LIBCPP_HIDE_FROM_ABI exception() _NOEXCEPT {}
+  _LIBCPP_HIDE_FROM_ABI exception(const exception&) _NOEXCEPT = default;
+
+  virtual ~exception() _NOEXCEPT;
+  virtual const char* what() const _NOEXCEPT;
+};
+
+class _LIBCPP_EXCEPTION_ABI bad_exception : public exception {
+public:
+  _LIBCPP_HIDE_FROM_ABI bad_exception() _NOEXCEPT {}
+  ~bad_exception() _NOEXCEPT override;
+  const char* what() const _NOEXCEPT override;
+};
+#endif // !_LIBCPP_ABI_VCRUNTIME
+
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_EXCEPTION_H
diff --git a/third_party/llvm-project/libcxx/include/__exception/exception_ptr.h b/third_party/llvm-project/libcxx/include/__exception/exception_ptr.h
new file mode 100644
index 0000000..cac4a88
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__exception/exception_ptr.h
@@ -0,0 +1,109 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
+#define _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
+
+#include <__config>
+#include <__exception/operations.h>
+#include <__memory/addressof.h>
+#include <cstddef>
+#include <cstdlib>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+namespace std { // purposefully not using versioning namespace
+
+#ifndef _LIBCPP_ABI_MICROSOFT
+
+class _LIBCPP_TYPE_VIS exception_ptr {
+  void* __ptr_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI exception_ptr() _NOEXCEPT : __ptr_() {}
+  _LIBCPP_HIDE_FROM_ABI exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
+
+  exception_ptr(const exception_ptr&) _NOEXCEPT;
+  exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
+  ~exception_ptr() _NOEXCEPT;
+
+  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __ptr_ != nullptr; }
+
+  friend _LIBCPP_HIDE_FROM_ABI bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
+    return __x.__ptr_ == __y.__ptr_;
+  }
+
+  friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
+    return !(__x == __y);
+  }
+
+  friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
+  friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+};
+
+template <class _Ep>
+_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT {
+#  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  try {
+    throw __e;
+  } catch (...) {
+    return current_exception();
+  }
+#  else
+  ((void)__e);
+  std::abort();
+#  endif
+}
+
+#else  // _LIBCPP_ABI_MICROSOFT
+
+class _LIBCPP_TYPE_VIS exception_ptr {
+  _LIBCPP_DIAGNOSTIC_PUSH
+  _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")
+  void* __ptr1_;
+  void* __ptr2_;
+  _LIBCPP_DIAGNOSTIC_POP
+
+public:
+  exception_ptr() _NOEXCEPT;
+  exception_ptr(nullptr_t) _NOEXCEPT;
+  exception_ptr(const exception_ptr& __other) _NOEXCEPT;
+  exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
+  exception_ptr& operator=(nullptr_t) _NOEXCEPT;
+  ~exception_ptr() _NOEXCEPT;
+  explicit operator bool() const _NOEXCEPT;
+};
+
+_LIBCPP_FUNC_VIS bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
+  return !(__x == __y);
+}
+
+_LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
+
+_LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void* __except, const void* __ptr);
+_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+
+// This is a built-in template function which automagically extracts the required
+// information.
+template <class _E>
+void* __GetExceptionInfo(_E);
+
+template <class _Ep>
+_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT {
+  return __copy_exception_ptr(std::addressof(__e), __GetExceptionInfo(__e));
+}
+
+#endif // _LIBCPP_ABI_MICROSOFT
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
diff --git a/third_party/llvm-project/libcxx/include/__exception/nested_exception.h b/third_party/llvm-project/libcxx/include/__exception/nested_exception.h
new file mode 100644
index 0000000..182c7dd
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__exception/nested_exception.h
@@ -0,0 +1,101 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
+#define _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
+
+#include <__config>
+#include <__exception/exception_ptr.h>
+#include <__memory/addressof.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_base_of.h>
+#include <__type_traits/is_class.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_final.h>
+#include <__type_traits/is_polymorphic.h>
+#include <__utility/forward.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+namespace std { // purposefully not using versioning namespace
+
+class _LIBCPP_EXCEPTION_ABI nested_exception {
+  exception_ptr __ptr_;
+
+public:
+  nested_exception() _NOEXCEPT;
+  //     nested_exception(const nested_exception&) noexcept = default;
+  //     nested_exception& operator=(const nested_exception&) noexcept = default;
+  virtual ~nested_exception() _NOEXCEPT;
+
+  // access functions
+  _LIBCPP_NORETURN void rethrow_nested() const;
+  _LIBCPP_HIDE_FROM_ABI exception_ptr nested_ptr() const _NOEXCEPT { return __ptr_; }
+};
+
+template <class _Tp>
+struct __nested : public _Tp, public nested_exception {
+  _LIBCPP_HIDE_FROM_ABI explicit __nested(const _Tp& __t) : _Tp(__t) {}
+};
+
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+template <class _Tp, class _Up, bool>
+struct __throw_with_nested;
+
+template <class _Tp, class _Up>
+struct __throw_with_nested<_Tp, _Up, true> {
+  _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void __do_throw(_Tp&& __t) {
+    throw __nested<_Up>(std::forward<_Tp>(__t));
+  }
+};
+
+template <class _Tp, class _Up>
+struct __throw_with_nested<_Tp, _Up, false> {
+  _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
+};
+#endif
+
+template <class _Tp>
+_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  using _Up = __decay_t<_Tp>;
+  static_assert(is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
+  __throw_with_nested<_Tp,
+                      _Up,
+                      is_class<_Up>::value && !is_base_of<nested_exception, _Up>::value &&
+                          !__libcpp_is_final<_Up>::value>::__do_throw(std::forward<_Tp>(__t));
+#else
+  ((void)__t);
+  // FIXME: Make this abort
+#endif
+}
+
+template <class _From, class _To>
+struct __can_dynamic_cast
+    : _BoolConstant< is_polymorphic<_From>::value &&
+                     (!is_base_of<_To, _From>::value || is_convertible<const _From*, const _To*>::value)> {};
+
+template <class _Ep>
+inline _LIBCPP_HIDE_FROM_ABI void
+rethrow_if_nested(const _Ep& __e, __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {
+  const nested_exception* __nep = dynamic_cast<const nested_exception*>(std::addressof(__e));
+  if (__nep)
+    __nep->rethrow_nested();
+}
+
+template <class _Ep>
+inline _LIBCPP_HIDE_FROM_ABI void
+rethrow_if_nested(const _Ep&, __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {}
+
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
diff --git a/third_party/llvm-project/libcxx/include/__exception/operations.h b/third_party/llvm-project/libcxx/include/__exception/operations.h
new file mode 100644
index 0000000..e8c5ba6
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__exception/operations.h
@@ -0,0 +1,42 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___EXCEPTION_OPERATIONS_H
+#define _LIBCPP___EXCEPTION_OPERATIONS_H
+
+#include <__availability>
+#include <__config>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+namespace std { // purposefully not using versioning namespace
+#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) ||                             \
+    defined(_LIBCPP_BUILDING_LIBRARY)
+using unexpected_handler = void (*)();
+_LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
+_LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
+#endif
+
+using terminate_handler = void (*)();
+_LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
+_LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
+
+_LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
+_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;
+
+class _LIBCPP_TYPE_VIS exception_ptr;
+
+_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_OPERATIONS_H
diff --git a/third_party/llvm-project/libcxx/include/__exception/terminate.h b/third_party/llvm-project/libcxx/include/__exception/terminate.h
new file mode 100644
index 0000000..d8dd964
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__exception/terminate.h
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___EXCEPTION_TERMINATE_H
+#define _LIBCPP___EXCEPTION_TERMINATE_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+namespace std { // purposefully not using versioning namespace
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_TERMINATE_H
diff --git a/third_party/llvm-project/libcxx/include/__expected/bad_expected_access.h b/third_party/llvm-project/libcxx/include/__expected/bad_expected_access.h
index 361eab4..e7a568c 100644
--- a/third_party/llvm-project/libcxx/include/__expected/bad_expected_access.h
+++ b/third_party/llvm-project/libcxx/include/__expected/bad_expected_access.h
@@ -10,10 +10,9 @@
 #define _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
 
 #include <__config>
+#include <__exception/exception.h>
 #include <__utility/move.h>
 
-#include <exception>
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__expected/expected.h b/third_party/llvm-project/libcxx/include/__expected/expected.h
index e1f590c..3ff8fbc 100644
--- a/third_party/llvm-project/libcxx/include/__expected/expected.h
+++ b/third_party/llvm-project/libcxx/include/__expected/expected.h
@@ -49,7 +49,7 @@
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
-#include <cstdlib> // for std::abort
+#include <__verbose_abort>
 #include <initializer_list>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -64,11 +64,11 @@
 
 template <class _Err, class _Arg>
 _LIBCPP_HIDE_FROM_ABI void __throw_bad_expected_access(_Arg&& __arg) {
-#  ifndef _LIBCPP_NO_EXCEPTIONS
+#  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_expected_access<_Err>(std::forward<_Arg>(__arg));
 #  else
   (void)__arg;
-  std::abort();
+  _LIBCPP_VERBOSE_ABORT("bad_expected_access was thrown in -fno-exceptions mode");
 #  endif
 }
 
@@ -292,7 +292,8 @@
           "be reverted to the previous state in case an exception is thrown during the assignment.");
       _T2 __tmp(std::move(__oldval));
       std::destroy_at(std::addressof(__oldval));
-      __exception_guard __trans([&] { std::construct_at(std::addressof(__oldval), std::move(__tmp)); });
+      auto __trans =
+          std::__make_exception_guard([&] { std::construct_at(std::addressof(__oldval), std::move(__tmp)); });
       std::construct_at(std::addressof(__newval), std::forward<_Args>(__args)...);
       __trans.__complete();
     }
@@ -451,7 +452,7 @@
       if constexpr (is_nothrow_move_constructible_v<_Err>) {
         _Err __tmp(std::move(__with_err.__union_.__unex_));
         std::destroy_at(std::addressof(__with_err.__union_.__unex_));
-        __exception_guard __trans([&] {
+        auto __trans = std::__make_exception_guard([&] {
           std::construct_at(std::addressof(__with_err.__union_.__unex_), std::move(__tmp));
         });
         std::construct_at(std::addressof(__with_err.__union_.__val_), std::move(__with_val.__union_.__val_));
@@ -464,7 +465,7 @@
                       "that it can be reverted to the previous state in case an exception is thrown during swap.");
         _Tp __tmp(std::move(__with_val.__union_.__val_));
         std::destroy_at(std::addressof(__with_val.__union_.__val_));
-        __exception_guard __trans([&] {
+        auto __trans = std::__make_exception_guard([&] {
           std::construct_at(std::addressof(__with_val.__union_.__val_), std::move(__tmp));
         });
         std::construct_at(std::addressof(__with_val.__union_.__unex_), std::move(__with_err.__union_.__unex_));
diff --git a/third_party/llvm-project/libcxx/include/__expected/unexpected.h b/third_party/llvm-project/libcxx/include/__expected/unexpected.h
index 075963a..75a057b 100644
--- a/third_party/llvm-project/libcxx/include/__expected/unexpected.h
+++ b/third_party/llvm-project/libcxx/include/__expected/unexpected.h
@@ -64,8 +64,8 @@
   _LIBCPP_HIDE_FROM_ABI constexpr unexpected(unexpected&&)      = default;
 
   template <class _Error = _Err>
-    requires(!is_same_v<remove_cvref_t<_Error>, unexpected> && //
-             !is_same_v<remove_cvref_t<_Error>, in_place_t> && //
+    requires(!is_same_v<remove_cvref_t<_Error>, unexpected> &&          //
+             !is_same_v<remove_cvref_t<_Error>, in_place_t> &&          //
              is_constructible_v<_Err, _Error>)
   _LIBCPP_HIDE_FROM_ABI constexpr explicit unexpected(_Error&& __error) //
       noexcept(is_nothrow_constructible_v<_Err, _Error>)                // strengthened
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/directory_entry.h b/third_party/llvm-project/libcxx/include/__filesystem/directory_entry.h
index b17eaaa..111dcbd 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/directory_entry.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/directory_entry.h
@@ -12,8 +12,8 @@
 
 #include <__availability>
 #include <__chrono/time_point.h>
+#include <__compare/ordering.h>
 #include <__config>
-#include <__errc>
 #include <__filesystem/file_status.h>
 #include <__filesystem/file_time_type.h>
 #include <__filesystem/file_type.h>
@@ -21,11 +21,12 @@
 #include <__filesystem/operations.h>
 #include <__filesystem/path.h>
 #include <__filesystem/perms.h>
+#include <__system_error/errc.h>
+#include <__system_error/error_code.h>
+#include <__utility/move.h>
 #include <__utility/unreachable.h>
 #include <cstdint>
-#include <cstdlib>
 #include <iosfwd>
-#include <system_error>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/directory_iterator.h b/third_party/llvm-project/libcxx/include/__filesystem/directory_iterator.h
index 5ff2f01..d74c8be 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/directory_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/directory_iterator.h
@@ -20,8 +20,9 @@
 #include <__memory/shared_ptr.h>
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/enable_view.h>
+#include <__system_error/error_code.h>
+#include <__utility/move.h>
 #include <cstddef>
-#include <system_error>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -148,7 +149,7 @@
 
 _LIBCPP_END_NAMESPACE_FILESYSTEM
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <>
 _LIBCPP_AVAILABILITY_FILESYSTEM
@@ -158,7 +159,7 @@
 _LIBCPP_AVAILABILITY_FILESYSTEM
 inline constexpr bool _VSTD::ranges::enable_view<_VSTD_FS::directory_iterator> = true;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP_CXX03_LANG
 
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/filesystem_error.h b/third_party/llvm-project/libcxx/include/__filesystem/filesystem_error.h
index effe699..7860fc4 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/filesystem_error.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/filesystem_error.h
@@ -14,11 +14,13 @@
 #include <__config>
 #include <__filesystem/path.h>
 #include <__memory/shared_ptr.h>
+#include <__system_error/error_code.h>
+#include <__system_error/system_error.h>
 #include <__utility/forward.h>
+#include <__verbose_abort>
 #include <iosfwd>
 #include <new>
-#include <system_error>
-#include <type_traits>
+#include <string>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -86,13 +88,13 @@
 
 template <class... _Args>
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
 void __throw_filesystem_error(_Args&&... __args) {
   throw filesystem_error(_VSTD::forward<_Args>(__args)...);
 }
 #else
 void __throw_filesystem_error(_Args&&...) {
-  _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("filesystem_error was thrown in -fno-exceptions mode");
 }
 #endif
 _LIBCPP_AVAILABILITY_FILESYSTEM_POP
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/operations.h b/third_party/llvm-project/libcxx/include/__filesystem/operations.h
index f48d301..6bf58d8 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/operations.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/operations.h
@@ -21,8 +21,8 @@
 #include <__filesystem/perm_options.h>
 #include <__filesystem/perms.h>
 #include <__filesystem/space_info.h>
+#include <__system_error/error_code.h>
 #include <cstdint>
-#include <system_error>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/path.h b/third_party/llvm-project/libcxx/include/__filesystem/path.h
index 4e6912f..0ab66d2 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/path.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/path.h
@@ -14,12 +14,17 @@
 #include <__algorithm/replace_copy.h>
 #include <__availability>
 #include <__config>
+#include <__functional/unary_function.h>
+#include <__fwd/hash.h>
 #include <__iterator/back_insert_iterator.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_pointer.h>
 #include <cstddef>
 #include <string>
 #include <string_view>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 # include <iomanip> // for quoted
@@ -139,7 +144,7 @@
   }
 };
 
-template <class _Source, class _DS = typename decay<_Source>::type,
+template <class _Source, class _DS = __decay_t<_Source>,
           class _UnqualPtrType =
               __remove_const_t<__remove_pointer_t<_DS> >,
           bool _IsCharPtr = is_pointer<_DS>::value&&
@@ -1086,6 +1091,17 @@
 
 _LIBCPP_END_NAMESPACE_FILESYSTEM
 
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <>
+struct _LIBCPP_AVAILABILITY_FILESYSTEM hash<_VSTD_FS::path> : __unary_function<_VSTD_FS::path, size_t> {
+  _LIBCPP_HIDE_FROM_ABI size_t operator()(_VSTD_FS::path const& __p) const noexcept {
+    return _VSTD_FS::hash_value(__p);
+  }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
 #endif // _LIBCPP_CXX03_LANG
 
 #endif // _LIBCPP___FILESYSTEM_PATH_H
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/recursive_directory_iterator.h b/third_party/llvm-project/libcxx/include/__filesystem/recursive_directory_iterator.h
index b20d201..ac40dc8 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/recursive_directory_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/recursive_directory_iterator.h
@@ -19,8 +19,9 @@
 #include <__memory/shared_ptr.h>
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/enable_view.h>
+#include <__system_error/error_code.h>
+#include <__utility/move.h>
 #include <cstddef>
-#include <system_error>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -168,7 +169,7 @@
 
 _LIBCPP_END_NAMESPACE_FILESYSTEM
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <>
 _LIBCPP_AVAILABILITY_FILESYSTEM
@@ -178,7 +179,7 @@
 _LIBCPP_AVAILABILITY_FILESYSTEM
 inline constexpr bool _VSTD::ranges::enable_view<_VSTD_FS::recursive_directory_iterator> = true;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #endif // _LIBCPP_CXX03_LANG
 
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/space_info.h b/third_party/llvm-project/libcxx/include/__filesystem/space_info.h
index d0747e3..25fcb9a 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/space_info.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/space_info.h
@@ -29,7 +29,7 @@
   uintmax_t free;
   uintmax_t available;
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
   friend _LIBCPP_HIDE_FROM_ABI bool operator==(const space_info&, const space_info&) = default;
 #  endif
 };
diff --git a/third_party/llvm-project/libcxx/include/__filesystem/u8path.h b/third_party/llvm-project/libcxx/include/__filesystem/u8path.h
index d35faa1..ebc1159 100644
--- a/third_party/llvm-project/libcxx/include/__filesystem/u8path.h
+++ b/third_party/llvm-project/libcxx/include/__filesystem/u8path.h
@@ -15,7 +15,6 @@
 #include <__config>
 #include <__filesystem/path.h>
 #include <string>
-#include <type_traits>
 
 // Only required on Windows for __widen_from_utf8, and included conservatively
 // because it requires support for localization.
diff --git a/third_party/llvm-project/libcxx/include/__format/buffer.h b/third_party/llvm-project/libcxx/include/__format/buffer.h
index ddfe767..0f669ba 100644
--- a/third_party/llvm-project/libcxx/include/__format/buffer.h
+++ b/third_party/llvm-project/libcxx/include/__format/buffer.h
@@ -27,10 +27,11 @@
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/wrap_iter.h>
+#include <__memory/addressof.h>
+#include <__type_traits/add_pointer.h>
 #include <__utility/move.h>
 #include <cstddef>
 #include <string_view>
-#include <type_traits>
 #include <vector>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -42,7 +43,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format {
 
@@ -564,7 +565,7 @@
 
 } // namespace __format
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/concepts.h b/third_party/llvm-project/libcxx/include/__format/concepts.h
index fe4a7b9..62552f8 100644
--- a/third_party/llvm-project/libcxx/include/__format/concepts.h
+++ b/third_party/llvm-project/libcxx/include/__format/concepts.h
@@ -18,7 +18,6 @@
 #include <__type_traits/is_specialization.h>
 #include <__utility/pair.h>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -26,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 /// The character type specializations of \ref formatter.
 template <class _CharT>
@@ -56,7 +55,7 @@
       { __cf.format(__t, __fc) } -> same_as<__fmt_iter_for<_CharT>>;
     };
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 template <class _Tp, class _CharT>
 concept formattable = __formattable<_Tp, _CharT>;
 
@@ -66,12 +65,11 @@
 // TODO FMT Add a test to validate we fail when using that concept after P2165
 // has been implemented.
 template <class _Tp>
-concept __fmt_pair_like = __is_specialization_v<_Tp, pair> ||
-                          // Use a requires since tuple_size_v may fail to instantiate,
-                          (__is_specialization_v<_Tp, tuple> && requires { tuple_size_v<_Tp> == 2; });
+concept __fmt_pair_like =
+    __is_specialization_v<_Tp, pair> || (__is_specialization_v<_Tp, tuple> && tuple_size_v<_Tp> == 2);
 
-#  endif //_LIBCPP_STD_VER > 20
-#endif //_LIBCPP_STD_VER > 17
+#  endif //_LIBCPP_STD_VER >= 23
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/container_adaptor.h b/third_party/llvm-project/libcxx/include/__format/container_adaptor.h
index 62b6981..5b95f60 100644
--- a/third_party/llvm-project/libcxx/include/__format/container_adaptor.h
+++ b/third_party/llvm-project/libcxx/include/__format/container_adaptor.h
@@ -19,12 +19,16 @@
 #include <__format/concepts.h>
 #include <__format/formatter.h>
 #include <__format/range_default_formatter.h>
+#include <__ranges/all.h>
+#include <__ranges/ref_view.h>
+#include <__type_traits/is_const.h>
+#include <__type_traits/maybe_const.h>
 #include <queue>
 #include <stack>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 // [container.adaptors.format] only specifies the library should provide the
 // formatter specializations, not which header should provide them.
@@ -33,10 +37,11 @@
 // adaptor headers. To use the format functions users already include <format>.
 
 template <class _Adaptor, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_container_adaptor {
+struct _LIBCPP_TEMPLATE_VIS __formatter_container_adaptor {
 private:
-  using __maybe_const_adaptor = __fmt_maybe_const<_Adaptor, _CharT>;
-  formatter<typename _Adaptor::container_type, _CharT> __underlying_;
+  using __maybe_const_container = __fmt_maybe_const<typename _Adaptor::container_type, _CharT>;
+  using __maybe_const_adaptor   = __maybe_const<is_const_v<__maybe_const_container>, _Adaptor>;
+  formatter<ranges::ref_view<__maybe_const_container>, _CharT> __underlying_;
 
 public:
   template <class _ParseContext>
@@ -52,18 +57,18 @@
 };
 
 template <class _CharT, class _Tp, formattable<_CharT> _Container>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<queue<_Tp, _Container>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<queue<_Tp, _Container>, _CharT>
     : public __formatter_container_adaptor<queue<_Tp, _Container>, _CharT> {};
 
 template <class _CharT, class _Tp, class _Container, class _Compare>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<priority_queue<_Tp, _Container, _Compare>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<priority_queue<_Tp, _Container, _Compare>, _CharT>
     : public __formatter_container_adaptor<priority_queue<_Tp, _Container, _Compare>, _CharT> {};
 
 template <class _CharT, class _Tp, formattable<_CharT> _Container>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<stack<_Tp, _Container>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<stack<_Tp, _Container>, _CharT>
     : public __formatter_container_adaptor<stack<_Tp, _Container>, _CharT> {};
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/enable_insertable.h b/third_party/llvm-project/libcxx/include/__format/enable_insertable.h
index 71b4252..86ef94a 100644
--- a/third_party/llvm-project/libcxx/include/__format/enable_insertable.h
+++ b/third_party/llvm-project/libcxx/include/__format/enable_insertable.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format {
 
@@ -28,7 +28,7 @@
 
 } // namespace __format
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/escaped_output_table.h b/third_party/llvm-project/libcxx/include/__format/escaped_output_table.h
index bd2994b..222847e 100644
--- a/third_party/llvm-project/libcxx/include/__format/escaped_output_table.h
+++ b/third_party/llvm-project/libcxx/include/__format/escaped_output_table.h
@@ -72,7 +72,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 namespace __escaped_output_table {
 
@@ -1031,7 +1031,7 @@
 
 } // namespace __escaped_output_table
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/extended_grapheme_cluster_table.h b/third_party/llvm-project/libcxx/include/__format/extended_grapheme_cluster_table.h
index 1ffcfeb..bd6d39f 100644
--- a/third_party/llvm-project/libcxx/include/__format/extended_grapheme_cluster_table.h
+++ b/third_party/llvm-project/libcxx/include/__format/extended_grapheme_cluster_table.h
@@ -73,7 +73,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __extended_grapheme_custer_property_boundary {
 
@@ -1654,7 +1654,7 @@
 
 } // namespace __extended_grapheme_custer_property_boundary
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_arg.h b/third_party/llvm-project/libcxx/include/__format/format_arg.h
index 771a03f..7e37dd4 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_arg.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_arg.h
@@ -18,6 +18,7 @@
 #include <__format/format_parse_context.h>
 #include <__functional/invoke.h>
 #include <__memory/addressof.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/unreachable.h>
 #include <__variant/monostate.h>
@@ -30,7 +31,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format {
 /// The type stored in @ref basic_format_arg.
@@ -94,7 +95,7 @@
 // This function is not user obervable, so it can directly use the non-standard
 // types of the "variant". See __arg_t for more details.
 template <class _Visitor, class _Context>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT decltype(auto)
+_LIBCPP_HIDE_FROM_ABI decltype(auto)
 __visit_format_arg(_Visitor&& __vis, basic_format_arg<_Context> __arg) {
   switch (__arg.__type_) {
   case __format::__arg_t::__none:
@@ -224,7 +225,7 @@
 };
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_arg {
+class _LIBCPP_TEMPLATE_VIS basic_format_arg {
 public:
   class _LIBCPP_TEMPLATE_VIS handle;
 
@@ -276,7 +277,7 @@
 // This function is user facing, so it must wrap the non-standard types of
 // the "variant" in a handle to stay conforming. See __arg_t for more details.
 template <class _Visitor, class _Context>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT decltype(auto)
+_LIBCPP_HIDE_FROM_ABI decltype(auto)
 visit_format_arg(_Visitor&& __vis, basic_format_arg<_Context> __arg) {
   switch (__arg.__type_) {
 #  ifndef _LIBCPP_HAS_NO_INT128
@@ -295,7 +296,7 @@
   }
 }
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_arg_store.h b/third_party/llvm-project/libcxx/include/__format/format_arg_store.h
index 6f4f4c3..b9a36e5 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_arg_store.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_arg_store.h
@@ -19,15 +19,16 @@
 #include <__config>
 #include <__format/concepts.h>
 #include <__format/format_arg.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/extent.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
-#include <cstring>
 #include <string>
 #include <string_view>
-#include <type_traits>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format {
 
@@ -142,21 +143,24 @@
 //
 // Note this version can't be constrained avoiding ambiguous overloads.
 // That means it can be instantiated by disabled formatters. To solve this, a
-// constrained version for not formattable formatters is added. That overload
-// is marked as deleted to fail creating a storage type for disabled formatters.
+// constrained version for not formattable formatters is added.
 template <class _Context, class _Tp>
 consteval __arg_t __determine_arg_t() {
   return __arg_t::__handle;
 }
 
+// The overload for not formattable types allows triggering the static
+// assertion below.
 template <class _Context, class _Tp>
   requires(!__formattable<_Tp, typename _Context::char_type>)
-consteval __arg_t __determine_arg_t() = delete;
+consteval __arg_t __determine_arg_t() {
+  return __arg_t::__none;
+}
 
 template <class _Context, class _Tp>
 _LIBCPP_HIDE_FROM_ABI basic_format_arg<_Context> __create_format_arg(_Tp&& __value) noexcept {
   constexpr __arg_t __arg = __determine_arg_t<_Context, remove_cvref_t<_Tp>>();
-  static_assert(__arg != __arg_t::__none);
+  static_assert(__arg != __arg_t::__none, "the supplied type is not formattable");
 
   // Not all types can be used to directly initialize the
   // __basic_format_arg_value.  First handle all types needing adjustment, the
@@ -247,7 +251,7 @@
   _Storage __storage;
 };
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_args.h b/third_party/llvm-project/libcxx/include/__format/format_args.h
index 8b8fbde..c2e7c96 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_args.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_args.h
@@ -24,10 +24,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_args {
+class _LIBCPP_TEMPLATE_VIS basic_format_args {
 public:
   _LIBCPP_HIDE_FROM_ABI basic_format_args() noexcept = default;
 
@@ -71,9 +71,11 @@
     const basic_format_arg<_Context>* __args_;
   };
 };
-_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_format_args);
 
-#endif //_LIBCPP_STD_VER > 17
+template <class _Context, class... _Args>
+basic_format_args(__format_arg_store<_Context, _Args...>) -> basic_format_args<_Context>;
+
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_context.h b/third_party/llvm-project/libcxx/include/__format/format_context.h
index 85e00eb..521131d 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_context.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_context.h
@@ -37,11 +37,11 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _OutIt, class _CharT>
 requires output_iterator<_OutIt, const _CharT&>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_context;
+class _LIBCPP_TEMPLATE_VIS basic_format_context;
 
 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
 /**
@@ -80,7 +80,6 @@
 class
     // clang-format off
     _LIBCPP_TEMPLATE_VIS
-    _LIBCPP_AVAILABILITY_FORMAT
     _LIBCPP_PREFERRED_NAME(format_context)
     _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wformat_context))
     // clang-format on
@@ -162,7 +161,7 @@
 // Here the width of an element in input is determined dynamically.
 // Note when the top-level element has no width the retargeting is not needed.
 template <class _CharT>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT
+class _LIBCPP_TEMPLATE_VIS
     basic_format_context<typename __format::__retarget_buffer<_CharT>::__iterator, _CharT> {
 public:
   using iterator  = typename __format::__retarget_buffer<_CharT>::__iterator;
@@ -216,7 +215,7 @@
 };
 
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_format_context);
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_error.h b/third_party/llvm-project/libcxx/include/__format/format_error.h
index 002d1a4..5f9b7da 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_error.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_error.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 class _LIBCPP_EXCEPTION_ABI format_error : public runtime_error {
 public:
@@ -40,7 +40,7 @@
 
 _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void
 __throw_format_error(const char* __s) {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw format_error(__s);
 #else
   (void)__s;
@@ -48,7 +48,7 @@
 #endif
 }
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_functions.h b/third_party/llvm-project/libcxx/include/__format/format_functions.h
index 185148c..60b40cb 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_functions.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_functions.h
@@ -38,7 +38,9 @@
 #include <__format/formatter_string.h>
 #include <__format/parser_std_format_spec.h>
 #include <__iterator/back_insert_iterator.h>
+#include <__iterator/concepts.h>
 #include <__iterator/incrementable_traits.h>
+#include <__iterator/readable_traits.h> // iter_value_t
 #include <__variant/monostate.h>
 #include <array>
 #include <string>
@@ -54,7 +56,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // TODO FMT Evaluate which templates should be external templates. This
 // improves the efficiency of the header. However since the header is still
@@ -147,41 +149,44 @@
   size_t __size_;
 };
 
-_LIBCPP_HIDE_FROM_ABI
-constexpr void __compile_time_validate_integral(__arg_t __type) {
-  switch (__type) {
-  case __arg_t::__int:
-  case __arg_t::__long_long:
-  case __arg_t::__i128:
-  case __arg_t::__unsigned:
-  case __arg_t::__unsigned_long_long:
-  case __arg_t::__u128:
-    return;
-
-  default:
-    std::__throw_format_error("Argument isn't an integral type");
-  }
-}
-
+// [format.string.std]/8
+// If { arg-idopt } is used in a width or precision, the value of the
+// corresponding formatting argument is used in its place. If the
+// corresponding formatting argument is not of standard signed or unsigned
+// integer type, or its value is negative for precision or non-positive for
+// width, an exception of type format_error is thrown.
+//
 // _HasPrecision does the formatter have a precision?
 template <class _CharT, class _Tp, bool _HasPrecision = false>
-_LIBCPP_HIDE_FROM_ABI constexpr void
-__compile_time_validate_argument(basic_format_parse_context<_CharT>& __parse_ctx,
-                                 __compile_time_basic_format_context<_CharT>& __ctx) {
+_LIBCPP_HIDE_FROM_ABI constexpr void __compile_time_validate_argument(
+    basic_format_parse_context<_CharT>& __parse_ctx, __compile_time_basic_format_context<_CharT>& __ctx) {
+  auto __validate_type = [](__arg_t __type) {
+    // LWG3720 originally allowed "signed or unsigned integer types", however
+    // the final version explicitly changed it to "*standard* signed or unsigned
+    // integer types". It's trivial to use 128-bit integrals in libc++'s
+    // implementation, but other implementations may not implement it.
+    // (Using a width or precision, that does not fit in 64-bits, sounds very
+    // unlikely in real world code.)
+    switch (__type) {
+    case __arg_t::__int:
+    case __arg_t::__long_long:
+    case __arg_t::__unsigned:
+    case __arg_t::__unsigned_long_long:
+      return;
+
+    default:
+      std::__throw_format_error("Replacement argument isn't a standard signed or unsigned integer type");
+    }
+  };
+
   formatter<_Tp, _CharT> __formatter;
   __parse_ctx.advance_to(__formatter.parse(__parse_ctx));
-  // [format.string.std]/7
-  // ... If the corresponding formatting argument is not of integral type, or
-  // its value is negative for precision or non-positive for width, an
-  // exception of type format_error is thrown.
-  //
-  // Validate whether the arguments are integrals.
   if (__formatter.__parser_.__width_as_arg_)
-    __format::__compile_time_validate_integral(__ctx.arg(__formatter.__parser_.__width_));
+    __validate_type(__ctx.arg(__formatter.__parser_.__width_));
 
   if constexpr (_HasPrecision)
     if (__formatter.__parser_.__precision_as_arg_)
-      __format::__compile_time_validate_integral(__ctx.arg(__formatter.__parser_.__precision_));
+      __validate_type(__ctx.arg(__formatter.__parser_.__precision_));
 }
 
 // This function is not user facing, so it can directly use the non-standard types of the "variant".
@@ -236,21 +241,22 @@
   std::__throw_format_error("Invalid argument");
 }
 
-template <class _CharT, class _ParseCtx, class _Ctx>
-_LIBCPP_HIDE_FROM_ABI constexpr const _CharT*
-__handle_replacement_field(const _CharT* __begin, const _CharT* __end,
+template <contiguous_iterator _Iterator, class _ParseCtx, class _Ctx>
+_LIBCPP_HIDE_FROM_ABI constexpr _Iterator
+__handle_replacement_field(_Iterator __begin, _Iterator __end,
                            _ParseCtx& __parse_ctx, _Ctx& __ctx) {
+  using _CharT = iter_value_t<_Iterator>;
   __format::__parse_number_result __r = __format::__parse_arg_id(__begin, __end, __parse_ctx);
 
-  bool __parse = *__r.__ptr == _CharT(':');
-  switch (*__r.__ptr) {
+  bool __parse = *__r.__last == _CharT(':');
+  switch (*__r.__last) {
   case _CharT(':'):
     // The arg-id has a format-specifier, advance the input to the format-spec.
-    __parse_ctx.advance_to(__r.__ptr + 1);
+    __parse_ctx.advance_to(__r.__last + 1);
     break;
   case _CharT('}'):
     // The arg-id has no format-specifier.
-    __parse_ctx.advance_to(__r.__ptr);
+    __parse_ctx.advance_to(__r.__last);
     break;
   default:
     std::__throw_format_error("The replacement field arg-id should terminate at a ':' or '}'");
@@ -258,10 +264,12 @@
 
   if constexpr (same_as<_Ctx, __compile_time_basic_format_context<_CharT>>) {
     __arg_t __type = __ctx.arg(__r.__value);
-    if (__type == __arg_t::__handle)
+    if (__type == __arg_t::__none)
+      std::__throw_format_error("Argument index out of bounds");
+    else if (__type == __arg_t::__handle)
       __ctx.__handle(__r.__value).__parse(__parse_ctx);
-    else
-        __format::__compile_time_visit_format_arg(__parse_ctx, __ctx, __type);
+    else if (__parse)
+      __format::__compile_time_visit_format_arg(__parse_ctx, __ctx, __type);
   } else
     _VSTD::__visit_format_arg(
         [&](auto __arg) {
@@ -291,8 +299,8 @@
   using _CharT = typename _ParseCtx::char_type;
   static_assert(same_as<typename _Ctx::char_type, _CharT>);
 
-  const _CharT* __begin = __parse_ctx.begin();
-  const _CharT* __end = __parse_ctx.end();
+  auto __begin = __parse_ctx.begin();
+  auto __end = __parse_ctx.end();
   typename _Ctx::iterator __out_it = __ctx.out();
   while (__begin != __end) {
     switch (*__begin) {
@@ -339,7 +347,7 @@
                            _Context{__types_.data(), __handles_.data(), sizeof...(_Args)});
   }
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT constexpr basic_string_view<_CharT> get() const noexcept {
+  _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<_CharT> get() const noexcept {
     return __str_;
   }
 
@@ -404,21 +412,21 @@
 // https://reviews.llvm.org/D110499#inline-1180704
 // TODO FMT Evaluate whether we want to file a Clang bug report regarding this.
 template <output_iterator<const char&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 vformat_to(_OutIt __out_it, string_view __fmt, format_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 vformat_to(_OutIt __out_it, wstring_view __fmt, wformat_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
 }
 #endif
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt.get(),
                            _VSTD::make_format_args(__args...));
@@ -426,14 +434,17 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt.get(),
                            _VSTD::make_wformat_args(__args...));
 }
 #endif
 
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI string
 vformat(string_view __fmt, format_args __args) {
   string __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
@@ -441,7 +452,10 @@
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI wstring
 vformat(wstring_view __fmt, wformat_args __args) {
   wstring __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
@@ -450,14 +464,14 @@
 #endif
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string format(format_string<_Args...> __fmt,
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI string format(format_string<_Args...> __fmt,
                                                                                       _Args&&... __args) {
   return _VSTD::vformat(__fmt.get(), _VSTD::make_format_args(__args...));
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI wstring
 format(wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat(__fmt.get(), _VSTD::make_wformat_args(__args...));
 }
@@ -474,14 +488,14 @@
 }
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformat_to_n<format_context>(_VSTD::move(__out_it), __n, __fmt.get(), _VSTD::make_format_args(__args...));
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, wformat_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<wformat_context>(_VSTD::move(__out_it), __n, __fmt.get(), _VSTD::make_wformat_args(__args...));
@@ -497,14 +511,14 @@
 }
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(__fmt.get(), basic_format_args{_VSTD::make_format_args(__args...)});
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(__fmt.get(), basic_format_args{_VSTD::make_wformat_args(__args...)});
 }
@@ -531,7 +545,7 @@
 }
 
 template <output_iterator<const char&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt vformat_to(
     _OutIt __out_it, locale __loc, string_view __fmt, format_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
                              __args);
@@ -539,7 +553,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt vformat_to(
     _OutIt __out_it, locale __loc, wstring_view __fmt, wformat_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
                              __args);
@@ -547,7 +561,7 @@
 #endif
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, locale __loc, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt.get(),
                            _VSTD::make_format_args(__args...));
@@ -555,14 +569,17 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt.get(),
                            _VSTD::make_wformat_args(__args...));
 }
 #endif
 
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI string
 vformat(locale __loc, string_view __fmt, format_args __args) {
   string __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
@@ -571,7 +588,10 @@
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI wstring
 vformat(locale __loc, wstring_view __fmt, wformat_args __args) {
   wstring __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
@@ -581,7 +601,7 @@
 #endif
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string format(locale __loc,
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI string format(locale __loc,
                                                                                       format_string<_Args...> __fmt,
                                                                                       _Args&&... __args) {
   return _VSTD::vformat(_VSTD::move(__loc), __fmt.get(),
@@ -590,7 +610,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI wstring
 format(locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat(_VSTD::move(__loc), __fmt.get(),
                         _VSTD::make_wformat_args(__args...));
@@ -609,7 +629,7 @@
 }
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc, format_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<format_context>(_VSTD::move(__out_it), __n, _VSTD::move(__loc), __fmt.get(),
@@ -618,7 +638,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc, wformat_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<wformat_context>(_VSTD::move(__out_it), __n, _VSTD::move(__loc), __fmt.get(),
@@ -636,14 +656,14 @@
 }
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(locale __loc, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(_VSTD::move(__loc), __fmt.get(), basic_format_args{_VSTD::make_format_args(__args...)});
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(_VSTD::move(__loc), __fmt.get(), basic_format_args{_VSTD::make_wformat_args(__args...)});
 }
@@ -652,7 +672,7 @@
 #endif // _LIBCPP_HAS_NO_LOCALIZATION
 
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_fwd.h b/third_party/llvm-project/libcxx/include/__format/format_fwd.h
index f7c72e2..120b2fc 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_fwd.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_fwd.h
@@ -20,19 +20,19 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_arg;
+class _LIBCPP_TEMPLATE_VIS basic_format_arg;
 
 template <class _OutIt, class _CharT>
   requires output_iterator<_OutIt, const _CharT&>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_context;
+class _LIBCPP_TEMPLATE_VIS basic_format_context;
 
 template <class _Tp, class _CharT = char>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter;
+struct _LIBCPP_TEMPLATE_VIS formatter;
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_parse_context.h b/third_party/llvm-project/libcxx/include/__format/format_parse_context.h
index 30e3a7d..79f53f7 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_parse_context.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_parse_context.h
@@ -12,6 +12,7 @@
 
 #include <__config>
 #include <__format/format_error.h>
+#include <__type_traits/is_constant_evaluated.h>
 #include <string_view>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -20,10 +21,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _CharT>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_parse_context {
+class _LIBCPP_TEMPLATE_VIS basic_format_parse_context {
 public:
   using char_type = _CharT;
   using const_iterator = typename basic_string_view<_CharT>::const_iterator;
@@ -58,6 +59,18 @@
 
     if (__indexing_ == __unknown)
       __indexing_ = __automatic;
+
+    // Throws an exception to make the expression a non core constant
+    // expression as required by:
+    // [format.parse.ctx]/8
+    //   Remarks: Let cur-arg-id be the value of next_arg_id_ prior to this
+    //   call. Call expressions where cur-arg-id >= num_args_ is true are not
+    //   core constant expressions (7.7 [expr.const]).
+    // Note: the Throws clause [format.parse.ctx]/9 doesn't specify the
+    // behavior when id >= num_args_.
+    if (is_constant_evaluated() && __next_arg_id_ >= __num_args_)
+      std::__throw_format_error("Argument index outside the valid range");
+
     return __next_arg_id_++;
   }
   _LIBCPP_HIDE_FROM_ABI constexpr void check_arg_id(size_t __id) {
@@ -93,7 +106,7 @@
 using wformat_parse_context = basic_format_parse_context<wchar_t>;
 #endif
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_string.h b/third_party/llvm-project/libcxx/include/__format/format_string.h
index d9caf86..bec3fe1 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_string.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_string.h
@@ -13,6 +13,8 @@
 #include <__assert>
 #include <__config>
 #include <__format/format_error.h>
+#include <__iterator/concepts.h>
+#include <__iterator/readable_traits.h> // iter_value_t
 #include <cstddef>
 #include <cstdint>
 
@@ -22,22 +24,22 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format {
 
-template <class _CharT>
+template <contiguous_iterator _Iterator>
 struct _LIBCPP_TEMPLATE_VIS __parse_number_result {
-  const _CharT* __ptr;
+  _Iterator __last;
   uint32_t __value;
 };
 
-template <class _CharT>
-__parse_number_result(const _CharT*, uint32_t) -> __parse_number_result<_CharT>;
+template <contiguous_iterator _Iterator>
+__parse_number_result(_Iterator, uint32_t) -> __parse_number_result<_Iterator>;
 
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_number(const _CharT* __begin, const _CharT* __end);
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_number(_Iterator __begin, _Iterator __end);
 
 /**
  * The maximum value of a numeric argument.
@@ -53,16 +55,16 @@
 inline constexpr uint32_t __number_max = INT32_MAX;
 
 namespace __detail {
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_zero(const _CharT* __begin, const _CharT*, auto& __parse_ctx) {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_zero(_Iterator __begin, _Iterator, auto& __parse_ctx) {
   __parse_ctx.check_arg_id(0);
   return {++__begin, 0}; // can never be larger than the maximum.
 }
 
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_automatic(const _CharT* __begin, const _CharT*, auto& __parse_ctx) {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_automatic(_Iterator __begin, _Iterator, auto& __parse_ctx) {
   size_t __value = __parse_ctx.next_arg_id();
   _LIBCPP_ASSERT(__value <= __number_max,
                  "Compilers don't support this number of arguments");
@@ -70,10 +72,10 @@
   return {__begin, uint32_t(__value)};
 }
 
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_manual(const _CharT* __begin, const _CharT* __end, auto& __parse_ctx) {
-  __parse_number_result<_CharT> __r = __format::__parse_number(__begin, __end);
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_manual(_Iterator __begin, _Iterator __end, auto& __parse_ctx) {
+  __parse_number_result<_Iterator> __r = __format::__parse_number(__begin, __end);
   __parse_ctx.check_arg_id(__r.__value);
   return __r;
 }
@@ -86,9 +88,10 @@
  * The number is used for the 31-bit values @em width and @em precision. This
  * allows a maximum value of 2147483647.
  */
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_number(const _CharT* __begin, const _CharT* __end_input) {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_number(_Iterator __begin, _Iterator __end_input) {
+  using _CharT = iter_value_t<_Iterator>;
   static_assert(__format::__number_max == INT32_MAX,
                 "The algorithm is implemented based on this value.");
   /*
@@ -98,7 +101,7 @@
    * - Does the value exceed width of an uint32_t? (Switching to uint64_t would
    *   have the same issue, but with a higher maximum.)
    */
-  const _CharT* __end = __end_input - __begin > 9 ? __begin + 9 : __end_input;
+  _Iterator __end = __end_input - __begin > 9 ? __begin + 9 : __end_input;
   uint32_t __value = *__begin - _CharT('0');
   while (++__begin != __end) {
     if (*__begin < _CharT('0') || *__begin > _CharT('9'))
@@ -134,9 +137,10 @@
  * The parser will return a pointer beyond the last consumed character. This
  * should be the closing '}' of the arg-id.
  */
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_CharT>
-__parse_arg_id(const _CharT* __begin, const _CharT* __end, auto& __parse_ctx) {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __parse_number_result<_Iterator>
+__parse_arg_id(_Iterator __begin, _Iterator __end, auto& __parse_ctx) {
+  using _CharT = iter_value_t<_Iterator>;
   switch (*__begin) {
   case _CharT('0'):
     return __detail::__parse_zero(__begin, __end, __parse_ctx);
@@ -156,7 +160,7 @@
 
 } // namespace __format
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/format_to_n_result.h b/third_party/llvm-project/libcxx/include/__format/format_to_n_result.h
index f1ed9a0..6f30546 100644
--- a/third_party/llvm-project/libcxx/include/__format/format_to_n_result.h
+++ b/third_party/llvm-project/libcxx/include/__format/format_to_n_result.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _OutIt>
 struct _LIBCPP_TEMPLATE_VIS format_to_n_result {
@@ -28,7 +28,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(format_to_n_result);
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter.h b/third_party/llvm-project/libcxx/include/__format/formatter.h
index 900a09a..172b2d5 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 /// The default formatter template.
 ///
@@ -32,13 +32,13 @@
 /// - is_copy_assignable<F>, and
 /// - is_move_assignable<F>.
 template <class _Tp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter {
+struct _LIBCPP_TEMPLATE_VIS formatter {
   formatter() = delete;
   formatter(const formatter&) = delete;
   formatter& operator=(const formatter&) = delete;
 };
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 
 template <class _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) {
@@ -46,8 +46,8 @@
     __formatter.set_debug_format();
 }
 
-#  endif // _LIBCPP_STD_VER > 20
-#endif   // _LIBCPP_STD_VER > 17
+#  endif // _LIBCPP_STD_VER >= 23
+#endif   // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_bool.h b/third_party/llvm-project/libcxx/include/__format/formatter_bool.h
index 0d005a1..1fb7575 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_bool.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_bool.h
@@ -33,10 +33,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<bool, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<bool, _CharT> {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
@@ -71,7 +71,7 @@
   __format_spec::__parser<_CharT> __parser_;
 };
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_char.h b/third_party/llvm-project/libcxx/include/__format/formatter_char.h
index 8a92e74..7d63c04 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_char.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_char.h
@@ -28,10 +28,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_char {
+struct _LIBCPP_TEMPLATE_VIS __formatter_char {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
@@ -44,7 +44,7 @@
     if (__parser_.__type_ == __format_spec::__type::__default || __parser_.__type_ == __format_spec::__type::__char)
       return __formatter::__format_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
     if (__parser_.__type_ == __format_spec::__type::__debug)
       return __formatter::__format_escaped_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
 #  endif
@@ -66,7 +66,7 @@
     return format(static_cast<wchar_t>(__value), __ctx);
   }
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
   _LIBCPP_HIDE_FROM_ABI constexpr void set_debug_format() { __parser_.__type_ = __format_spec::__type::__debug; }
 #  endif
 
@@ -74,19 +74,19 @@
 };
 
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, char> : public __formatter_char<char> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<char, char> : public __formatter_char<char> {};
 
 #  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
 
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {
+struct _LIBCPP_TEMPLATE_VIS formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {
 };
 
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_floating_point.h b/third_party/llvm-project/libcxx/include/__format/formatter_floating_point.h
index a544b53..12c7e58 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_floating_point.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_floating_point.h
@@ -16,6 +16,9 @@
 #include <__algorithm/min.h>
 #include <__algorithm/rotate.h>
 #include <__algorithm/transform.h>
+#include <__charconv/chars_format.h>
+#include <__charconv/to_chars_floating_point.h>
+#include <__charconv/to_chars_result.h>
 #include <__concepts/arithmetic.h>
 #include <__concepts/same_as.h>
 #include <__config>
@@ -26,9 +29,12 @@
 #include <__format/formatter_output.h>
 #include <__format/parser_std_format_spec.h>
 #include <__memory/allocator.h>
+#include <__system_error/errc.h>
+#include <__type_traits/conditional.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
-#include <charconv>
+#include <cmath>
+#include <cstddef>
 
 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
 #  include <locale>
@@ -43,7 +49,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __formatter {
 
@@ -404,7 +410,6 @@
       // In fixed mode the algorithm truncates trailing spaces and possibly the
       // radix point. There's no good guess for the position of the radix point
       // therefore scan the output after the first digit.
-
       __result.__radix_point = _VSTD::find(__first, __result.__last, '.');
     }
   }
@@ -665,7 +670,7 @@
       if (__result.__exponent == __result.__last)
         // if P > X >= -4, the conversion is with style f or F and precision P - 1 - X.
         // By including the radix point it calculates P - (1 + X)
-        __p -= __result.__radix_point - __buffer.begin();
+        __p -= __result.__radix_point - __result.__integral;
       else
         // otherwise, the conversion is with style e or E and precision P - 1.
         --__p;
@@ -739,16 +744,16 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<float, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<float, _CharT>
     : public __formatter_floating_point<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<double, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<double, _CharT>
     : public __formatter_floating_point<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long double, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<long double, _CharT>
     : public __formatter_floating_point<_CharT> {};
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_integer.h b/third_party/llvm-project/libcxx/include/__format/formatter_integer.h
index b4be9f9..0e14410 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_integer.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_integer.h
@@ -19,8 +19,8 @@
 #include <__format/formatter_integral.h>
 #include <__format/formatter_output.h>
 #include <__format/parser_std_format_spec.h>
+#include <__type_traits/is_same.h>
 #include <__type_traits/make_32_64_or_128_bit.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -28,10 +28,10 @@
 
     _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
     template <__fmt_char_type _CharT>
-    struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_integer {
+    struct _LIBCPP_TEMPLATE_VIS __formatter_integer {
 
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
@@ -60,47 +60,47 @@
 
 // Signed integral types.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<signed char, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<signed char, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<short, _CharT> : public __formatter_integer<_CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<short, _CharT> : public __formatter_integer<_CharT> {
 };
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<int, _CharT> : public __formatter_integer<_CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<int, _CharT> : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long, _CharT> : public __formatter_integer<_CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<long, _CharT> : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<long long, _CharT>
     : public __formatter_integer<_CharT> {};
 #  ifndef _LIBCPP_HAS_NO_INT128
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<__int128_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<__int128_t, _CharT>
     : public __formatter_integer<_CharT> {};
 #  endif
 
 // Unsigned integral types.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned char, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned char, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned short, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned short, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned long, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned long long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned long long, _CharT>
     : public __formatter_integer<_CharT> {};
 #  ifndef _LIBCPP_HAS_NO_INT128
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<__uint128_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<__uint128_t, _CharT>
     : public __formatter_integer<_CharT> {};
 #  endif
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_integral.h b/third_party/llvm-project/libcxx/include/__format/formatter_integral.h
index fe3a063..80d2457 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_integral.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_integral.h
@@ -10,6 +10,9 @@
 #ifndef _LIBCPP___FORMAT_FORMATTER_INTEGRAL_H
 #define _LIBCPP___FORMAT_FORMATTER_INTEGRAL_H
 
+#include <__charconv/to_chars_integral.h>
+#include <__charconv/to_chars_result.h>
+#include <__charconv/traits.h>
 #include <__concepts/arithmetic.h>
 #include <__concepts/same_as.h>
 #include <__config>
@@ -17,11 +20,13 @@
 #include <__format/format_error.h>
 #include <__format/formatter_output.h>
 #include <__format/parser_std_format_spec.h>
+#include <__system_error/errc.h>
+#include <__type_traits/make_unsigned.h>
 #include <__utility/unreachable.h>
 #include <array>
-#include <charconv>
 #include <limits>
 #include <string>
+#include <string_view>
 
 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
 #  include <locale>
@@ -36,7 +41,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __formatter {
 
@@ -354,7 +359,7 @@
 
 } // namespace __formatter
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_output.h b/third_party/llvm-project/libcxx/include/__format/formatter_output.h
index 4676925..f751d8a 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_output.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_output.h
@@ -12,7 +12,10 @@
 
 #include <__algorithm/ranges_copy.h>
 #include <__algorithm/ranges_fill_n.h>
+#include <__algorithm/ranges_for_each.h>
 #include <__algorithm/ranges_transform.h>
+#include <__charconv/to_chars_integral.h>
+#include <__charconv/to_chars_result.h>
 #include <__chrono/statically_widen.h>
 #include <__concepts/same_as.h>
 #include <__config>
@@ -23,10 +26,12 @@
 #include <__format/parser_std_format_spec.h>
 #include <__format/unicode.h>
 #include <__iterator/back_insert_iterator.h>
+#include <__iterator/concepts.h>
+#include <__iterator/readable_traits.h> // iter_value_t
+#include <__system_error/errc.h>
 #include <__type_traits/make_unsigned.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
-#include <charconv>
 #include <cstddef>
 #include <string>
 #include <string_view>
@@ -37,7 +42,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __formatter {
 
@@ -261,11 +266,11 @@
   return __formatter::__fill(_VSTD::move(__out_it), __padding.__after_, __specs.__fill_);
 }
 
-template <class _CharT, class _ParserCharT>
+template <contiguous_iterator _Iterator, class _ParserCharT>
 _LIBCPP_HIDE_FROM_ABI auto
-__write(const _CharT* __first,
-        const _CharT* __last,
-        output_iterator<const _CharT&> auto __out_it,
+__write(_Iterator __first,
+        _Iterator __last,
+        output_iterator<const iter_value_t<_Iterator>&> auto __out_it,
         __format_spec::__parsed_specifications<_ParserCharT> __specs,
         ptrdiff_t __size) -> decltype(__out_it) {
   _LIBCPP_ASSERT(__first <= __last, "Not a valid range");
@@ -275,11 +280,11 @@
 /// \overload
 ///
 /// Calls the function above where \a __size = \a __last - \a __first.
-template <class _CharT, class _ParserCharT>
+template <contiguous_iterator _Iterator, class _ParserCharT>
 _LIBCPP_HIDE_FROM_ABI auto
-__write(const _CharT* __first,
-        const _CharT* __last,
-        output_iterator<const _CharT&> auto __out_it,
+__write(_Iterator __first,
+        _Iterator __last,
+        output_iterator<const iter_value_t<_Iterator>&> auto __out_it,
         __format_spec::__parsed_specifications<_ParserCharT> __specs) -> decltype(__out_it) {
   _LIBCPP_ASSERT(__first <= __last, "Not a valid range");
   return __formatter::__write(__first, __last, _VSTD::move(__out_it), __specs, __last - __first);
@@ -359,7 +364,7 @@
 
 template <class _CharT>
 _LIBCPP_HIDE_FROM_ABI int __truncate(basic_string_view<_CharT>& __str, int __precision) {
-  __format_spec::__column_width_result<_CharT> __result =
+  __format_spec::__column_width_result __result =
       __format_spec::__estimate_column_width(__str, __precision, __format_spec::__column_width_rounding::__down);
   __str = basic_string_view<_CharT>{__str.begin(), __result.__last_};
   return __result.__width_;
@@ -382,7 +387,7 @@
   return __formatter::__write(__str.begin(), __str.end(), _VSTD::move(__out_it), __specs, __size);
 }
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 
 struct __nul_terminator {};
 
@@ -501,36 +506,17 @@
   __unicode::__code_point_view<_CharT> __view{__values.begin(), __values.end()};
 
   while (!__view.__at_end()) {
-    const _CharT* __first                               = __view.__position();
-    typename __unicode::__consume_p2286_result __result = __view.__consume_p2286();
-    if (__result.__ill_formed_size == 0) {
-      if (!__formatter::__is_escaped_sequence_written(__str, __result.__value, __mark))
+    auto __first                                  = __view.__position();
+    typename __unicode::__consume_result __result = __view.__consume();
+    if (__result.__status == __unicode::__consume_result::__ok) {
+      if (!__formatter::__is_escaped_sequence_written(__str, __result.__code_point, __mark))
         // 2.2.1.3 - Add the character
         ranges::copy(__first, __view.__position(), std::back_insert_iterator(__str));
-
     } else {
       // 2.2.3 sequence of ill-formed code units
-      // The number of code-units in __result.__value depends on the character type being used.
-      if constexpr (sizeof(_CharT) == 1) {
-        _LIBCPP_ASSERT(__result.__ill_formed_size == 1 || __result.__ill_formed_size == 4,
-                       "illegal number of invalid code units.");
-        if (__result.__ill_formed_size == 1) // ill-formed, one code unit
-          __formatter::__write_escape_ill_formed_code_unit(__str, __result.__value & 0xff);
-        else { // out of valid range, four code units
-               // The code point was properly encoded, decode the value.
-          __formatter::__write_escape_ill_formed_code_unit(__str, __result.__value >> 18 | 0xf0);
-          __formatter::__write_escape_ill_formed_code_unit(__str, (__result.__value >> 12 & 0x3f) | 0x80);
-          __formatter::__write_escape_ill_formed_code_unit(__str, (__result.__value >> 6 & 0x3f) | 0x80);
-          __formatter::__write_escape_ill_formed_code_unit(__str, (__result.__value & 0x3f) | 0x80);
-        }
-      } else if constexpr (sizeof(_CharT) == 2) {
-        _LIBCPP_ASSERT(__result.__ill_formed_size == 1, "for UTF-16 at most one invalid code unit");
-        __formatter::__write_escape_ill_formed_code_unit(__str, __result.__value & 0xffff);
-      } else {
-        static_assert(sizeof(_CharT) == 4, "unsupported character width");
-        _LIBCPP_ASSERT(__result.__ill_formed_size == 1, "for UTF-32 one code unit is one code point");
-        __formatter::__write_escape_ill_formed_code_unit(__str, __result.__value);
-      }
+      ranges::for_each(__first, __view.__position(), [&](_CharT __value) {
+        __formatter::__write_escape_ill_formed_code_unit(__str, __formatter::__to_char32(__value));
+      });
     }
   }
 }
@@ -559,11 +545,11 @@
   return __formatter::__write_string(basic_string_view{__str}, _VSTD::move(__out_it), __specs);
 }
 
-#  endif // _LIBCPP_STD_VER > 20
+#  endif // _LIBCPP_STD_VER >= 23
 
 } // namespace __formatter
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_pointer.h b/third_party/llvm-project/libcxx/include/__format/formatter_pointer.h
index 31b49e1..48d8372 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_pointer.h
@@ -27,13 +27,11 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
 struct _LIBCPP_TEMPLATE_VIS __formatter_pointer {
 public:
-  constexpr __formatter_pointer() { __parser_.__alignment_ = __format_spec::__alignment::__right; }
-
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
     auto __result = __parser_.__parse(__parse_ctx, __format_spec::__fields_pointer);
@@ -48,7 +46,7 @@
     return __formatter::__format_integer(reinterpret_cast<uintptr_t>(__ptr), __ctx, __specs);
   }
 
-  __format_spec::__parser<_CharT> __parser_;
+  __format_spec::__parser<_CharT> __parser_{.__alignment_ = __format_spec::__alignment::__right};
 };
 
 // [format.formatter.spec]/2.4
@@ -57,16 +55,16 @@
 // - template<> struct formatter<void*, charT>;
 // - template<> struct formatter<const void*, charT>;
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<nullptr_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<nullptr_t, _CharT>
     : public __formatter_pointer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<void*, _CharT> : public __formatter_pointer<_CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<void*, _CharT> : public __formatter_pointer<_CharT> {
 };
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const void*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<const void*, _CharT>
     : public __formatter_pointer<_CharT> {};
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_string.h b/third_party/llvm-project/libcxx/include/__format/formatter_string.h
index 606fb79..c14518b 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_string.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_string.h
@@ -27,7 +27,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
 struct _LIBCPP_TEMPLATE_VIS __formatter_string {
@@ -40,7 +40,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI auto format(basic_string_view<_CharT> __str, auto& __ctx) const -> decltype(__ctx.out()) {
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
     if (__parser_.__type_ == __format_spec::__type::__debug)
       return __formatter::__format_escaped_string(__str, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
 #  endif
@@ -48,7 +48,7 @@
     return __formatter::__write_string(__str, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
   }
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
   _LIBCPP_HIDE_FROM_ABI constexpr void set_debug_format() { __parser_.__type_ = __format_spec::__type::__debug; }
 #  endif
 
@@ -57,7 +57,7 @@
 
 // Formatter const char*.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const _CharT*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<const _CharT*, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -66,7 +66,7 @@
                           "prevented an invalid pointer.");
 
     __format_spec::__parsed_specifications<_CharT> __specs = _Base::__parser_.__get_parsed_std_specifications(__ctx);
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
     if (_Base::__parser_.__type_ == __format_spec::__type::__debug)
       return __formatter::__format_escaped_string(basic_string_view<_CharT>{__str}, __ctx.out(), __specs);
 #  endif
@@ -95,7 +95,7 @@
 
 // Formatter char*.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<_CharT*, _CharT>
     : public formatter<const _CharT*, _CharT> {
   using _Base = formatter<const _CharT*, _CharT>;
 
@@ -106,7 +106,7 @@
 
 // Formatter char[].
 template <__fmt_char_type _CharT, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT[_Size], _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<_CharT[_Size], _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -115,20 +115,9 @@
   }
 };
 
-// Formatter const char[].
-template <__fmt_char_type _CharT, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const _CharT[_Size], _CharT>
-    : public __formatter_string<_CharT> {
-  using _Base = __formatter_string<_CharT>;
-
-  _LIBCPP_HIDE_FROM_ABI auto format(const _CharT __str[_Size], auto& __ctx) const -> decltype(__ctx.out()) {
-    return _Base::format(basic_string_view<_CharT>(__str, _Size), __ctx);
-  }
-};
-
 // Formatter std::string.
 template <__fmt_char_type _CharT, class _Traits, class _Allocator>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string<_CharT, _Traits, _Allocator>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<basic_string<_CharT, _Traits, _Allocator>, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -141,7 +130,7 @@
 
 // Formatter std::string_view.
 template <__fmt_char_type _CharT, class _Traits>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string_view<_CharT, _Traits>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<basic_string_view<_CharT, _Traits>, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -152,7 +141,7 @@
   }
 };
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/formatter_tuple.h b/third_party/llvm-project/libcxx/include/__format/formatter_tuple.h
index 82f5ada..9d6367b 100644
--- a/third_party/llvm-project/libcxx/include/__format/formatter_tuple.h
+++ b/third_party/llvm-project/libcxx/include/__format/formatter_tuple.h
@@ -14,6 +14,7 @@
 #include <__availability>
 #include <__chrono/statically_widen.h>
 #include <__config>
+#include <__format/buffer.h>
 #include <__format/concepts.h>
 #include <__format/format_args.h>
 #include <__format/format_context.h>
@@ -35,50 +36,55 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 template <__fmt_char_type _CharT, class _Tuple, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_tuple {
-  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) {
+struct _LIBCPP_TEMPLATE_VIS __formatter_tuple {
+  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) noexcept {
     __separator_ = __separator;
   }
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) {
+  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) noexcept {
     __opening_bracket_ = __opening_bracket;
     __closing_bracket_ = __closing_bracket;
   }
 
   template <class _ParseContext>
   _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __parse_ctx) {
-    const _CharT* __begin = __parser_.__parse(__parse_ctx, __format_spec::__fields_tuple);
+    auto __begin = __parser_.__parse(__parse_ctx, __format_spec::__fields_tuple);
 
-    // [format.tuple]/7
-    //   ... For each element e in underlying_, if e.set_debug_format()
-    //   is a valid expression, calls e.set_debug_format().
-    // TODO FMT this can be removed when P2733 is accepted.
-    std::__for_each_index_sequence(make_index_sequence<sizeof...(_Args)>(), [&]<size_t _Index> {
-      std::__set_debug_format(std::get<_Index>(__underlying_));
-    });
-
-    const _CharT* __end = __parse_ctx.end();
-    if (__begin == __end)
-      return __begin;
-
-    if (*__begin == _CharT('m')) {
-      if constexpr (sizeof...(_Args) == 2) {
-        set_separator(_LIBCPP_STATICALLY_WIDEN(_CharT, ": "));
+    auto __end = __parse_ctx.end();
+    if (__begin != __end) {
+      if (*__begin == _CharT('m')) {
+        if constexpr (sizeof...(_Args) == 2) {
+          set_separator(_LIBCPP_STATICALLY_WIDEN(_CharT, ": "));
+          set_brackets({}, {});
+          ++__begin;
+        } else
+          std::__throw_format_error("The format specifier m requires a pair or a two-element tuple");
+      } else if (*__begin == _CharT('n')) {
         set_brackets({}, {});
         ++__begin;
-      } else
-        std::__throw_format_error("The format specifier m requires a pair or a two-element tuple");
-    } else if (*__begin == _CharT('n')) {
-      set_brackets({}, {});
-      ++__begin;
+      }
     }
 
     if (__begin != __end && *__begin != _CharT('}'))
       std::__throw_format_error("The format-spec should consume the input or end with a '}'");
 
+    __parse_ctx.advance_to(__begin);
+
+    // [format.tuple]/7
+    //   ... For each element e in underlying_, if e.set_debug_format()
+    //   is a valid expression, calls e.set_debug_format().
+    std::__for_each_index_sequence(make_index_sequence<sizeof...(_Args)>(), [&]<size_t _Index> {
+      auto& __formatter = std::get<_Index>(__underlying_);
+      __formatter.parse(__parse_ctx);
+      // Unlike the range_formatter we don't guard against evil parsers. Since
+      // this format-spec never has a format-spec for the underlying type
+      // adding the test would give additional overhead.
+      std::__set_debug_format(__formatter);
+    });
+
     return __begin;
   }
 
@@ -91,26 +97,25 @@
     if (!__specs.__has_width())
       return __format_tuple(__tuple, __ctx);
 
-    basic_string<_CharT> __str;
-
-    // Since the output is written to a different iterator a new context is
-    // created. Since the underlying formatter uses the default formatting it
-    // doesn't need a locale or the formatting arguments. So creating a new
-    // context works.
-    //
-    // This solution works for this formatter, but it will not work for the
-    // range_formatter. In that patch a generic solution is work in progress.
-    // Once that is finished it can be used here. (The range_formatter will use
-    // these features so it's easier to add it there and then port it.)
-    //
-    // TODO FMT Use formatting wrapping used in the range_formatter.
-    basic_format_context __c = std::__format_context_create(
-        back_insert_iterator{__str},
-        basic_format_args<basic_format_context<back_insert_iterator<basic_string<_CharT>>, _CharT>>{});
+    // The size of the buffer needed is:
+    // - open bracket characters
+    // - close bracket character
+    // - n elements where every element may have a different size
+    // - (n -1) separators
+    // The size of the element is hard to predict, knowing the type helps but
+    // it depends on the format-spec. As an initial estimate we guess 6
+    // characters.
+    // Typically both brackets are 1 character and the separator is 2
+    // characters. Which means there will be
+    //   (n - 1) * 2 + 1 + 1 = n * 2 character
+    // So estimate 8 times the range size as buffer.
+    __format::__retarget_buffer<_CharT> __buffer{8 * tuple_size_v<_Tuple>};
+    basic_format_context<typename __format::__retarget_buffer<_CharT>::__iterator, _CharT> __c{
+        __buffer.__make_output_iterator(), __ctx};
 
     __format_tuple(__tuple, __c);
 
-    return __formatter::__write_string_no_precision(basic_string_view{__str}, __ctx.out(), __specs);
+    return __formatter::__write_string_no_precision(basic_string_view{__buffer.__view()}, __ctx.out(), __specs);
   }
 
   template <class _FormatContext>
@@ -120,35 +125,7 @@
     std::__for_each_index_sequence(make_index_sequence<sizeof...(_Args)>(), [&]<size_t _Index> {
       if constexpr (_Index)
         __ctx.advance_to(std::ranges::copy(__separator_, __ctx.out()).out);
-
-        // During review Victor suggested to make the exposition only
-        // __underlying_ member a local variable. Currently the Standard
-        // requires nested debug-enabled formatter specializations not to
-        // output escaped output. P2733 fixes that bug, once accepted the
-        // code below can be used.
-        // (Note when a paper allows parsing a tuple-underlying-spec the
-        // exposition only member needs to be a class member. Earlier
-        // revisions of P2286 proposed that, but this was not pursued,
-        // due to time constrains and complexity of the matter.)
-        // TODO FMT This can be updated after P2733 is accepted.
-#  if 0
-      // P2286 uses an exposition only member in the formatter
-      //   tuple<formatter<remove_cvref_t<_Args>, _CharT>...> __underlying_;
-      // This was used in earlier versions of the paper since
-      // __underlying_.parse(...) was called. This is no longer the case
-      // so we can reduce the scope of the formatter.
-      //
-      // It does require the underlying's parse effect to be moved here too.
-      using _Arg = tuple_element<_Index, decltype(__tuple)>;
-      formatter<remove_cvref_t<_Args>, _CharT> __underlying;
-
-      // [format.tuple]/7
-      //   ... For each element e in underlying_, if e.set_debug_format()
-      //   is a valid expression, calls e.set_debug_format().
-      std::__set_debug_format(__underlying);
-#  else
       __ctx.advance_to(std::get<_Index>(__underlying_).format(std::get<_Index>(__tuple), __ctx));
-#  endif
     });
 
     return std::ranges::copy(__closing_bracket_, __ctx.out()).out;
@@ -164,14 +141,14 @@
 };
 
 template <__fmt_char_type _CharT, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<pair<_Args...>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<pair<_Args...>, _CharT>
     : public __formatter_tuple<_CharT, pair<_Args...>, _Args...> {};
 
 template <__fmt_char_type _CharT, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<tuple<_Args...>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<tuple<_Args...>, _CharT>
     : public __formatter_tuple<_CharT, tuple<_Args...>, _Args...> {};
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/parser_std_format_spec.h b/third_party/llvm-project/libcxx/include/__format/parser_std_format_spec.h
index c03cec9..620ce4f 100644
--- a/third_party/llvm-project/libcxx/include/__format/parser_std_format_spec.h
+++ b/third_party/llvm-project/libcxx/include/__format/parser_std_format_spec.h
@@ -28,11 +28,13 @@
 #include <__format/format_parse_context.h>
 #include <__format/format_string.h>
 #include <__format/unicode.h>
+#include <__iterator/concepts.h>
+#include <__iterator/readable_traits.h> // iter_value_t
+#include <__type_traits/common_type.h>
+#include <__type_traits/is_trivially_copyable.h>
 #include <__variant/monostate.h>
-#include <bit>
 #include <cstdint>
 #include <string_view>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -43,13 +45,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __format_spec {
 
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __format::__parse_number_result< _CharT>
-__parse_arg_id(const _CharT* __begin, const _CharT* __end, auto& __parse_ctx) {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __format::__parse_number_result<_Iterator>
+__parse_arg_id(_Iterator __begin, _Iterator __end, auto& __parse_ctx) {
+  using _CharT = iter_value_t<_Iterator>;
   // This function is a wrapper to call the real parser. But it does the
   // validation for the pre-conditions and post-conditions.
   if (__begin == __end)
@@ -57,10 +60,10 @@
 
   __format::__parse_number_result __r = __format::__parse_arg_id(__begin, __end, __parse_ctx);
 
-  if (__r.__ptr == __end || *__r.__ptr != _CharT('}'))
+  if (__r.__last == __end || *__r.__last != _CharT('}'))
     std::__throw_format_error("Invalid arg-id");
 
-  ++__r.__ptr;
+  ++__r.__last;
   return __r;
 }
 
@@ -78,22 +81,33 @@
   return _VSTD::__visit_format_arg(
       [](auto __arg) -> uint32_t {
         using _Type = decltype(__arg);
-        if constexpr (integral<_Type>) {
+        if constexpr (same_as<_Type, monostate>)
+          std::__throw_format_error("Argument index out of bounds");
+
+        // [format.string.std]/8
+        // If { arg-idopt } is used in a width or precision, the value of the
+        // corresponding formatting argument is used in its place. If the
+        // corresponding formatting argument is not of standard signed or unsigned
+        // integer type, or its value is negative for precision or non-positive for
+        // width, an exception of type format_error is thrown.
+        //
+        // When an integral is used in a format function, it is stored as one of
+        // the types checked below. Other integral types are promoted. For example,
+        // a signed char is stored as an int.
+        if constexpr (same_as<_Type, int> || same_as<_Type, unsigned int> || //
+                      same_as<_Type, long long> || same_as<_Type, unsigned long long>) {
           if constexpr (signed_integral<_Type>) {
             if (__arg < 0)
               std::__throw_format_error("A format-spec arg-id replacement shouldn't have a negative value");
           }
 
           using _CT = common_type_t<_Type, decltype(__format::__number_max)>;
-          if (static_cast<_CT>(__arg) >
-              static_cast<_CT>(__format::__number_max))
+          if (static_cast<_CT>(__arg) > static_cast<_CT>(__format::__number_max))
             std::__throw_format_error("A format-spec arg-id replacement exceeds the maximum supported value");
 
           return __arg;
-        } else if constexpr (same_as<_Type, monostate>)
-          std::__throw_format_error("Argument index out of bounds");
-        else
-          std::__throw_format_error("A format-spec arg-id replacement argument isn't an integral type");
+        } else
+          std::__throw_format_error("Replacement argument isn't a standard signed or unsigned integer type");
       },
       __format_arg);
 }
@@ -116,7 +130,7 @@
   // formatters use the colon to mark the beginning of the
   // underlying-format-spec. To avoid parsing ambiguities these formatter
   // specializations prohibit the use of the colon as a fill character.
-  uint8_t __allow_colon_in_fill_ : 1 {false};
+  uint8_t __use_range_fill_ : 1 {false};
 };
 
 // By not placing this constant in the formatter class it's not duplicated for
@@ -137,9 +151,10 @@
 inline constexpr __fields __fields_string{.__precision_ = true, .__type_ = true};
 inline constexpr __fields __fields_pointer{.__type_ = true};
 
-#  if _LIBCPP_STD_VER > 20
-inline constexpr __fields __fields_tuple{.__type_ = false, .__allow_colon_in_fill_ = true};
-inline constexpr __fields __fields_range{.__type_ = false, .__allow_colon_in_fill_ = true};
+#  if _LIBCPP_STD_VER >= 23
+inline constexpr __fields __fields_tuple{.__use_range_fill_ = true};
+inline constexpr __fields __fields_range{.__use_range_fill_ = true};
+inline constexpr __fields __fields_fill_align_width{};
 #  endif
 
 enum class _LIBCPP_ENUM_VIS __alignment : uint8_t {
@@ -196,6 +211,7 @@
 struct __chrono {
   __alignment __alignment_ : 3;
   bool __locale_specific_form_ : 1;
+  bool __hour_                 : 1;
   bool __weekday_name_ : 1;
   bool __weekday_              : 1;
   bool __day_of_year_          : 1;
@@ -268,12 +284,12 @@
   _LIBCPP_HIDE_FROM_ABI constexpr auto __parse(basic_format_parse_context<_CharT>& __parse_ctx, __fields __fields)
       -> decltype(__parse_ctx.begin()) {
 
-    const _CharT* __begin = __parse_ctx.begin();
-    const _CharT* __end = __parse_ctx.end();
+    auto __begin = __parse_ctx.begin();
+    auto __end = __parse_ctx.end();
     if (__begin == __end)
       return __begin;
 
-    if (__parse_fill_align(__begin, __end, __fields.__allow_colon_in_fill_) && __begin == __end)
+    if (__parse_fill_align(__begin, __end, __fields.__use_range_fill_) && __begin == __end)
       return __begin;
 
     if (__fields.__sign_ && __parse_sign(__begin) && __begin == __end)
@@ -326,6 +342,7 @@
         .__chrono_ =
             __chrono{.__alignment_            = __alignment_,
                      .__locale_specific_form_ = __locale_specific_form_,
+                     .__hour_                 = __hour_,
                      .__weekday_name_         = __weekday_name_,
                      .__weekday_              = __weekday_,
                      .__day_of_year_          = __day_of_year_,
@@ -345,6 +362,8 @@
 
   // These flags are only used for formatting chrono. Since the struct has
   // padding space left it's added to this structure.
+  bool __hour_ : 1 {false};
+
   bool __weekday_name_ : 1 {false};
   bool __weekday_      : 1 {false};
 
@@ -353,7 +372,7 @@
 
   bool __month_name_ : 1 {false};
 
-  uint8_t __reserved_1_ : 3 {0};
+  uint8_t __reserved_1_ : 2 {0};
   uint8_t __reserved_2_ : 6 {0};
   // These two flags are only used internally and not part of the
   // __parsed_specifications. Therefore put them at the end.
@@ -391,8 +410,8 @@
   }
 
   // range-fill and tuple-fill are identical
-  _LIBCPP_HIDE_FROM_ABI constexpr bool
-  __parse_fill_align(const _CharT*& __begin, const _CharT* __end, bool __use_range_fill) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_fill_align(_Iterator& __begin, _Iterator __end, bool __use_range_fill) {
     _LIBCPP_ASSERT(__begin != __end, "when called with an empty input the function will cause "
                                      "undefined behavior by evaluating data not in the input");
     if (__begin + 1 != __end) {
@@ -415,7 +434,8 @@
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_sign(const _CharT*& __begin) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_sign(_Iterator& __begin) {
     switch (*__begin) {
     case _CharT('-'):
       __sign_ = __sign::__minus;
@@ -433,7 +453,8 @@
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_alternate_form(const _CharT*& __begin) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_alternate_form(_Iterator& __begin) {
     if (*__begin != _CharT('#'))
       return false;
 
@@ -442,7 +463,8 @@
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_zero_padding(const _CharT*& __begin) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_zero_padding(_Iterator& __begin) {
     if (*__begin != _CharT('0'))
       return false;
 
@@ -452,7 +474,8 @@
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_width(const _CharT*& __begin, const _CharT* __end, auto& __parse_ctx) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_width(_Iterator& __begin, _Iterator __end, auto& __parse_ctx) {
     if (*__begin == _CharT('0'))
       std::__throw_format_error("A format-spec width field shouldn't have a leading zero");
 
@@ -460,7 +483,7 @@
       __format::__parse_number_result __r = __format_spec::__parse_arg_id(++__begin, __end, __parse_ctx);
       __width_as_arg_ = true;
       __width_ = __r.__value;
-      __begin = __r.__ptr;
+      __begin = __r.__last;
       return true;
     }
 
@@ -471,12 +494,12 @@
     __width_ = __r.__value;
     _LIBCPP_ASSERT(__width_ != 0, "A zero value isn't allowed and should be impossible, "
                                   "due to validations in this function");
-    __begin = __r.__ptr;
+    __begin = __r.__last;
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_precision(const _CharT*& __begin, const _CharT* __end,
-                                                         auto& __parse_ctx) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_precision(_Iterator& __begin, _Iterator __end, auto& __parse_ctx) {
     if (*__begin != _CharT('.'))
       return false;
 
@@ -488,7 +511,7 @@
       __format::__parse_number_result __arg_id = __format_spec::__parse_arg_id(++__begin, __end, __parse_ctx);
       __precision_as_arg_ = true;
       __precision_ = __arg_id.__value;
-      __begin = __arg_id.__ptr;
+      __begin = __arg_id.__last;
       return true;
     }
 
@@ -498,11 +521,12 @@
     __format::__parse_number_result __r = __format::__parse_number(__begin, __end);
     __precision_ = __r.__value;
     __precision_as_arg_ = false;
-    __begin = __r.__ptr;
+    __begin = __r.__last;
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_locale_specific_form(const _CharT*& __begin) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr bool __parse_locale_specific_form(_Iterator& __begin) {
     if (*__begin != _CharT('L'))
       return false;
 
@@ -511,7 +535,8 @@
     return true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr void __parse_type(const _CharT*& __begin) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr void __parse_type(_Iterator& __begin) {
     // Determines the type. It does not validate whether the selected type is
     // valid. Most formatters have optional fields that are only allowed for
     // certain types. These parsers need to do validation after the type has
@@ -569,7 +594,7 @@
     case 'x':
       __type_ = __type::__hexadecimal_lower_case;
       break;
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
     case '?':
       __type_ = __type::__debug;
       break;
@@ -734,18 +759,18 @@
   }
 }
 
-template <class _CharT>
+template <contiguous_iterator _Iterator>
 struct __column_width_result {
   /// The number of output columns.
   size_t __width_;
   /// One beyond the last code unit used in the estimation.
   ///
   /// This limits the original output to fit in the wanted number of columns.
-  const _CharT* __last_;
+  _Iterator __last_;
 };
 
-template <class _CharT>
-__column_width_result(size_t, const _CharT*) -> __column_width_result<_CharT>;
+template <contiguous_iterator _Iterator>
+__column_width_result(size_t, _Iterator) -> __column_width_result<_Iterator>;
 
 /// Since a column width can be two it's possible that the requested column
 /// width can't be achieved. Depending on the intended usage the policy can be
@@ -812,12 +837,13 @@
   return __detail::__column_width_4(__c);
 }
 
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<_CharT> __estimate_column_width_grapheme_clustering(
-    const _CharT* __first, const _CharT* __last, size_t __maximum, __column_width_rounding __rounding) noexcept {
+template <contiguous_iterator _Iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<_Iterator> __estimate_column_width_grapheme_clustering(
+    _Iterator __first, _Iterator __last, size_t __maximum, __column_width_rounding __rounding) noexcept {
+  using _CharT = iter_value_t<_Iterator>;
   __unicode::__extended_grapheme_cluster_view<_CharT> __view{__first, __last};
 
-  __column_width_result<_CharT> __result{0, __first};
+  __column_width_result<_Iterator> __result{0, __first};
   while (__result.__last_ != __last && __result.__width_ <= __maximum) {
     typename __unicode::__extended_grapheme_cluster_view<_CharT>::__cluster __cluster = __view.__consume();
     int __width = __detail::__column_width(__cluster.__code_point_);
@@ -884,8 +910,8 @@
 /// \param __rounding Selects the rounding method.
 ///                   \c __down result.__width_ <= __maximum
 ///                   \c __up result.__width_ <= __maximum + 1
-template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<_CharT> __estimate_column_width(
+template <class _CharT, class _Iterator = typename basic_string_view<_CharT>::const_iterator>
+_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<_Iterator> __estimate_column_width(
     basic_string_view<_CharT> __str, size_t __maximum, __column_width_rounding __rounding) noexcept {
   // The width estimation is done in two steps:
   // - Quickly process for the ASCII part. ASCII has the following properties
@@ -904,7 +930,7 @@
   // need to scan one code unit beyond the requested precision. When this code
   // unit is non-ASCII we omit the current code unit and let the Grapheme
   // clustering algorithm do its work.
-  const _CharT* __it = __str.begin();
+  auto __it = __str.begin();
   if (__format_spec::__is_ascii(*__it)) {
     do {
       --__maximum;
@@ -932,7 +958,7 @@
 }
 #  else // !defined(_LIBCPP_HAS_NO_UNICODE)
 template <class _CharT>
-_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<_CharT>
+_LIBCPP_HIDE_FROM_ABI constexpr __column_width_result<typename basic_string_view<_CharT>::const_iterator>
 __estimate_column_width(basic_string_view<_CharT> __str, size_t __maximum, __column_width_rounding) noexcept {
   // When Unicode isn't supported assume ASCII and every code unit is one code
   // point. In ASCII the estimated column width is always one. Thus there's no
@@ -945,7 +971,7 @@
 
 } // namespace __format_spec
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/range_default_formatter.h b/third_party/llvm-project/libcxx/include/__format/range_default_formatter.h
index 774887b..3954f98 100644
--- a/third_party/llvm-project/libcxx/include/__format/range_default_formatter.h
+++ b/third_party/llvm-project/libcxx/include/__format/range_default_formatter.h
@@ -14,6 +14,7 @@
 #  pragma GCC system_header
 #endif
 
+#include <__algorithm/ranges_copy.h>
 #include <__availability>
 #include <__chrono/statically_widen.h>
 #include <__concepts/same_as.h>
@@ -21,7 +22,10 @@
 #include <__format/concepts.h>
 #include <__format/formatter.h>
 #include <__format/range_formatter.h>
+#include <__iterator/back_insert_iterator.h>
 #include <__ranges/concepts.h>
+#include <__ranges/data.h>
+#include <__ranges/size.h>
 #include <__type_traits/remove_cvref.h>
 #include <__utility/pair.h>
 #include <string_view>
@@ -29,7 +33,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 template <class _Rp, class _CharT>
 concept __const_formattable_range =
@@ -83,40 +87,23 @@
     return range_format::sequence;
 }();
 
-// This is a non-standard work-around to fix instantiation of
-//   formatter<const _CharT[N], _CharT>
-// const _CharT[N] satisfies the ranges::input_range concept.
-// remove_cvref_t<const _CharT[N]> is _CharT[N] so it does not satisfy the
-// requirement of the above specialization. Instead it will instantiate the
-// primary template, which is ill-formed.
-//
-// An alternative solution is to remove the offending formatter.
-//
-// https://godbolt.org/z/bqjhhaexx
-//
-// The removal is proposed in LWG3833, but use the work-around until the issue
-// has been adopted.
-// TODO FMT Implement LWG3833.
-template <class _CharT, size_t N>
-inline constexpr range_format format_kind<const _CharT[N]> = range_format::disabled;
-
 template <range_format _Kp, ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter;
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter;
 
 // Required specializations
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::sequence, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::sequence, _Rp, _CharT> {
 private:
   using __maybe_const_r = __fmt_maybe_const<_Rp, _CharT>;
   range_formatter<remove_cvref_t<ranges::range_reference_t<__maybe_const_r>>, _CharT> __underlying_;
 
 public:
-  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) {
+  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) noexcept {
     __underlying_.set_separator(__separator);
   }
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) {
+  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) noexcept {
     __underlying_.set_brackets(__opening_bracket, __closing_bracket);
   }
 
@@ -132,7 +119,7 @@
 };
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::map, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::map, _Rp, _CharT> {
 private:
   using __maybe_const_map = __fmt_maybe_const<_Rp, _CharT>;
   using __element_type    = remove_cvref_t<ranges::range_reference_t<__maybe_const_map>>;
@@ -160,7 +147,7 @@
 };
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::set, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::set, _Rp, _CharT> {
 private:
   using __maybe_const_set = __fmt_maybe_const<_Rp, _CharT>;
   using __element_type    = remove_cvref_t<ranges::range_reference_t<__maybe_const_set>>;
@@ -185,16 +172,48 @@
 
 template <range_format _Kp, ranges::input_range _Rp, class _CharT>
   requires(_Kp == range_format::string || _Kp == range_format::debug_string)
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<_Kp, _Rp, _CharT> {
-  __range_default_formatter() = delete; // TODO FMT Implement
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<_Kp, _Rp, _CharT> {
+private:
+  // This deviates from the Standard, there the exposition only type is
+  //   formatter<basic_string<charT>, charT> underlying_;
+  // Using a string_view allows the format function to avoid a copy of the
+  // input range when it is a contigious range.
+  formatter<basic_string_view<_CharT>, _CharT> __underlying_;
+
+public:
+  template <class _ParseContext>
+  _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
+    typename _ParseContext::iterator __i = __underlying_.parse(__ctx);
+    if constexpr (_Kp == range_format::debug_string)
+      __underlying_.set_debug_format();
+    return __i;
+  }
+
+  template <class _FormatContext>
+  _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator
+  format(conditional_t<ranges::input_range<const _Rp>, const _Rp&, _Rp&> __range, _FormatContext& __ctx) const {
+    // When the range is contiguous use a basic_string_view instead to avoid a
+    // copy of the underlying data. The basic_string_view formatter
+    // specialization is the "basic" string formatter in libc++.
+    if constexpr (ranges::contiguous_range<_Rp> && std::ranges::sized_range<_Rp>)
+      return __underlying_.format(basic_string_view<_CharT>{ranges::data(__range), ranges::size(__range)}, __ctx);
+    else {
+      // P2106's from_range has not been implemented yet. Instead use a simple
+      // copy operation.
+      // TODO FMT use basic_string's "from_range" constructor.
+      // return __underlying_.format(basic_string<_CharT>{from_range, __range}, __ctx);
+      basic_string<_CharT> __str;
+      std::ranges::copy(__range, back_insert_iterator{__str});
+      return __underlying_.format(static_cast<basic_string_view<_CharT>>(__str), __ctx);
+    }
+  }
 };
 
 template <ranges::input_range _Rp, class _CharT>
   requires(format_kind<_Rp> != range_format::disabled && formattable<ranges::range_reference_t<_Rp>, _CharT>)
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_Rp, _CharT>
-    : __range_default_formatter<format_kind<_Rp>, _Rp, _CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<_Rp, _CharT> : __range_default_formatter<format_kind<_Rp>, _Rp, _CharT> {};
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/range_formatter.h b/third_party/llvm-project/libcxx/include/__format/range_formatter.h
index 9ea61a7..0af233e 100644
--- a/third_party/llvm-project/libcxx/include/__format/range_formatter.h
+++ b/third_party/llvm-project/libcxx/include/__format/range_formatter.h
@@ -36,49 +36,78 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 template <class _Tp, class _CharT = char>
   requires same_as<remove_cvref_t<_Tp>, _Tp> && formattable<_Tp, _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT range_formatter {
-  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) {
+struct _LIBCPP_TEMPLATE_VIS range_formatter {
+  _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) noexcept {
     __separator_ = __separator;
   }
   _LIBCPP_HIDE_FROM_ABI constexpr void
-  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) {
+  set_brackets(basic_string_view<_CharT> __opening_bracket, basic_string_view<_CharT> __closing_bracket) noexcept {
     __opening_bracket_ = __opening_bracket;
     __closing_bracket_ = __closing_bracket;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr formatter<_Tp, _CharT>& underlying() { return __underlying_; }
-  _LIBCPP_HIDE_FROM_ABI constexpr const formatter<_Tp, _CharT>& underlying() const { return __underlying_; }
+  _LIBCPP_HIDE_FROM_ABI constexpr formatter<_Tp, _CharT>& underlying() noexcept { return __underlying_; }
+  _LIBCPP_HIDE_FROM_ABI constexpr const formatter<_Tp, _CharT>& underlying() const noexcept { return __underlying_; }
 
   template <class _ParseContext>
   _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __parse_ctx) {
-    const _CharT* __begin = __parser_.__parse(__parse_ctx, __format_spec::__fields_range);
-    const _CharT* __end   = __parse_ctx.end();
-    if (__begin == __end)
-      return __begin;
+    auto __begin = __parser_.__parse(__parse_ctx, __format_spec::__fields_range);
+    auto __end   = __parse_ctx.end();
+    // Note the cases where __begin == __end in this code only happens when the
+    // replacement-field has no terminating }, or when the parse is manually
+    // called with a format-spec. The former is an error and the latter means
+    // using a formatter without the format functions or print.
+    if (__begin == __end) [[unlikely]]
+      return __parse_empty_range_underlying_spec(__parse_ctx, __begin);
 
     // The n field overrides a possible m type, therefore delay applying the
     // effect of n until the type has been procesed.
     bool __clear_brackets = (*__begin == _CharT('n'));
     if (__clear_brackets) {
       ++__begin;
-      if (__begin == __end) {
+      if (__begin == __end) [[unlikely]] {
         // Since there is no more data, clear the brackets before returning.
         set_brackets({}, {});
-        return __begin;
+        return __parse_empty_range_underlying_spec(__parse_ctx, __begin);
       }
     }
 
     __parse_type(__begin, __end);
     if (__clear_brackets)
       set_brackets({}, {});
-    if (__begin == __end)
-      return __begin;
+    if (__begin == __end) [[unlikely]]
+      return __parse_empty_range_underlying_spec(__parse_ctx, __begin);
 
     bool __has_range_underlying_spec = *__begin == _CharT(':');
+    if (__has_range_underlying_spec) {
+      // range-underlying-spec:
+      //   :  format-spec
+      ++__begin;
+    } else if (__begin != __end && *__begin != _CharT('}'))
+      // When there is no underlaying range the current parse should have
+      // consumed the format-spec. If not, the not consumed input will be
+      // processed by the underlying. For example {:-} for a range in invalid,
+      // the sign field is not present. Without this check the underlying_ will
+      // get -} as input which my be valid.
+      std::__throw_format_error("The format-spec should consume the input or end with a '}'");
+
+    __parse_ctx.advance_to(__begin);
+    __begin = __underlying_.parse(__parse_ctx);
+
+    // This test should not be required if __has_range_underlying_spec is false.
+    // However this test makes sure the underlying formatter left the parser in
+    // a valid state. (Note this is not a full protection against evil parsers.
+    // For example
+    //   } this is test for the next argument {}
+    //   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
+    // could consume more than it should.
+    if (__begin != __end && *__begin != _CharT('}'))
+      std::__throw_format_error("The format-spec should consume the input or end with a '}'");
+
     if (__parser_.__type_ != __format_spec::__type::__default) {
       // [format.range.formatter]/6
       //   If the range-type is s or ?s, then there shall be no n option and no
@@ -96,20 +125,6 @@
     } else if (!__has_range_underlying_spec)
       std::__set_debug_format(__underlying_);
 
-    if (__has_range_underlying_spec) {
-      // range-underlying-spec:
-      //   :  format-spec
-      ++__begin;
-      if (__begin == __end)
-        return __begin;
-
-      __parse_ctx.advance_to(__begin);
-      __begin = __underlying_.parse(__parse_ctx);
-    }
-
-    if (__begin != __end && *__begin != _CharT('}'))
-      std::__throw_format_error("The format-spec should consume the input or end with a '}'");
-
     return __begin;
   }
 
@@ -211,7 +226,8 @@
   __format_spec::__parser<_CharT> __parser_{.__alignment_ = __format_spec::__alignment::__left};
 
 private:
-  _LIBCPP_HIDE_FROM_ABI constexpr void __parse_type(const _CharT*& __begin, const _CharT* __end) {
+  template <contiguous_iterator _Iterator>
+  _LIBCPP_HIDE_FROM_ABI constexpr void __parse_type(_Iterator& __begin, _Iterator __end) {
     switch (*__begin) {
     case _CharT('m'):
       if constexpr (__fmt_pair_like<_Tp>) {
@@ -242,13 +258,23 @@
     }
   }
 
+  template <class _ParseContext>
+  _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator
+  __parse_empty_range_underlying_spec(_ParseContext& __parse_ctx, typename _ParseContext::iterator __begin) {
+    __parse_ctx.advance_to(__begin);
+    [[maybe_unused]] typename _ParseContext::iterator __result = __underlying_.parse(__parse_ctx);
+    _LIBCPP_ASSERT(__result == __begin,
+                   "the underlying's parse function should not advance the input beyond the end of the input");
+    return __begin;
+  }
+
   formatter<_Tp, _CharT> __underlying_;
   basic_string_view<_CharT> __separator_       = _LIBCPP_STATICALLY_WIDEN(_CharT, ", ");
   basic_string_view<_CharT> __opening_bracket_ = _LIBCPP_STATICALLY_WIDEN(_CharT, "[");
   basic_string_view<_CharT> __closing_bracket_ = _LIBCPP_STATICALLY_WIDEN(_CharT, "]");
 };
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__format/unicode.h b/third_party/llvm-project/libcxx/include/__format/unicode.h
index 4327258..12aed50 100644
--- a/third_party/llvm-project/libcxx/include/__format/unicode.h
+++ b/third_party/llvm-project/libcxx/include/__format/unicode.h
@@ -11,11 +11,15 @@
 #define _LIBCPP___FORMAT_UNICODE_H
 
 #include <__assert>
+#include <__bit/countl.h>
+#include <__concepts/same_as.h>
 #include <__config>
 #include <__format/extended_grapheme_cluster_table.h>
+#include <__iterator/concepts.h>
+#include <__iterator/readable_traits.h> // iter_value_t
 #include <__type_traits/make_unsigned.h>
 #include <__utility/unreachable.h>
-#include <bit>
+#include <string_view>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -23,27 +27,32 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __unicode {
 
-#  if _LIBCPP_STD_VER > 20
+// Helper struct for the result of a consume operation.
+//
+// The status value for a correct code point is 0. This allows a valid value to
+// be used without masking.
+// When the decoding fails it know the number of code units affected. For the
+// current use-cases that value is not needed, therefore it is not stored.
+// The escape routine needs the number of code units for both a valid and
+// invalid character and keeps track of it itself. Doing it in this result
+// unconditionally would give some overhead when the value is unneeded.
+struct __consume_result {
+  // When __status == __ok it contains the decoded code point.
+  // Else it contains the replacement character U+FFFD
+  char32_t __code_point : 31;
 
-/// The result of consuming a code point using P2286' semantics
-///
-/// TODO FMT Combine __consume and  __consume_p2286 in one function.
-struct __consume_p2286_result {
-  // A size of 0 means well formed. This to differenciate between
-  // a valid code point and a code unit that's invalid like 0b11111xxx.
-  int __ill_formed_size;
-
-  // If well formed the consumed code point.
-  // Otherwise the ill-formed code units as unsigned 8-bit values. They are
-  // stored in reverse order, to make it easier to extract the values.
-  char32_t __value;
+  enum : char32_t {
+    // Consumed a well-formed code point.
+    __ok = 0,
+    // Encountered invalid UTF-8
+    __error = 1
+  } __status : 1 {__ok};
 };
-
-#  endif // _LIBCPP_STD_VER > 20
+static_assert(sizeof(__consume_result) == sizeof(char32_t));
 
 #  ifndef _LIBCPP_HAS_NO_UNICODE
 
@@ -62,7 +71,39 @@
 
 inline constexpr char32_t __replacement_character = U'\ufffd';
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool __is_continuation(const char* __char, int __count) {
+// The error of a consume operation.
+//
+// This sets the code point to the replacement character. This code point does
+// not participate in the grapheme clustering, so grapheme clustering code can
+// ignore the error status and always use the code point.
+inline constexpr __consume_result __consume_result_error{__replacement_character, __consume_result::__error};
+
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool __is_high_surrogate(char32_t __value) {
+  return __value >= 0xd800 && __value <= 0xdbff;
+}
+
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool __is_low_surrogate(char32_t __value) {
+  return __value >= 0xdc00 && __value <= 0xdfff;
+}
+
+// https://www.unicode.org/glossary/#surrogate_code_point
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline constexpr bool __is_surrogate(char32_t __value) {
+  return __value >= 0xd800 && __value <= 0xdfff;
+}
+
+// https://www.unicode.org/glossary/#code_point
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline constexpr bool __is_code_point(char32_t __value) {
+  return __value <= 0x10ffff;
+}
+
+// https://www.unicode.org/glossary/#unicode_scalar_value
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline constexpr bool __is_scalar_value(char32_t __value) {
+  return __unicode::__is_code_point(__value) && !__unicode::__is_surrogate(__value);
+}
+
+template <contiguous_iterator _Iterator>
+  requires same_as<iter_value_t<_Iterator>, char>
+_LIBCPP_HIDE_FROM_ABI constexpr bool __is_continuation(_Iterator __char, int __count) {
   do {
     if ((*__char & 0b1000'0000) != 0b1000'0000)
       return false;
@@ -82,68 +123,38 @@
 /// UTF-8 specialization.
 template <>
 class __code_point_view<char> {
+  using _Iterator = basic_string_view<char>::const_iterator;
+
 public:
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(const char* __first, const char* __last)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(_Iterator __first, _Iterator __last)
       : __first_(__first), __last_(__last) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr bool __at_end() const noexcept { return __first_ == __last_; }
-  _LIBCPP_HIDE_FROM_ABI constexpr const char* __position() const noexcept { return __first_; }
+  _LIBCPP_HIDE_FROM_ABI constexpr _Iterator __position() const noexcept { return __first_; }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr char32_t __consume() noexcept {
-    _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
-
-    // Based on the number of leading 1 bits the number of code units in the
-    // code point can be determined. See
-    // https://en.wikipedia.org/wiki/UTF-8#Encoding
-    switch (_VSTD::countl_one(static_cast<unsigned char>(*__first_))) {
-    case 0:
-      return *__first_++;
-
-    case 2:
-      if (__last_ - __first_ < 2 || !__unicode::__is_continuation(__first_ + 1, 1)) [[unlikely]]
-        break;
-      else {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x1f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        return __value;
-      }
-
-    case 3:
-      if (__last_ - __first_ < 3 || !__unicode::__is_continuation(__first_ + 1, 2)) [[unlikely]]
-        break;
-      else {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x0f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        return __value;
-      }
-
-    case 4:
-      if (__last_ - __first_ < 4 || !__unicode::__is_continuation(__first_ + 1, 3)) [[unlikely]]
-        break;
-      else {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x07;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        return __value;
-      }
-    }
-    // An invalid number of leading ones can be garbage or a code unit in the
-    // middle of a code point. By consuming one code unit the parser may get
-    // "in sync" after a few code units.
-    ++__first_;
-    return __replacement_character;
-  }
-
-#    if _LIBCPP_STD_VER > 20
-  _LIBCPP_HIDE_FROM_ABI constexpr __consume_p2286_result __consume_p2286() noexcept {
+  // https://www.unicode.org/versions/latest/ch03.pdf#G7404
+  // Based on Table 3-7, Well-Formed UTF-8 Byte Sequences
+  //
+  // Code Points        First Byte Second Byte Third Byte Fourth Byte  Remarks
+  // U+0000..U+007F     00..7F                                         U+0000..U+007F 1 code unit range
+  //                    C0..C1     80..BF                              invalid overlong encoding
+  // U+0080..U+07FF     C2..DF     80..BF                              U+0080..U+07FF 2 code unit range
+  //                    E0         80..9F      80..BF                  invalid overlong encoding
+  // U+0800..U+0FFF     E0         A0..BF      80..BF                  U+0800..U+FFFF 3 code unit range
+  // U+1000..U+CFFF     E1..EC     80..BF      80..BF
+  // U+D000..U+D7FF     ED         80..9F      80..BF
+  // U+D800..U+DFFF     ED         A0..BF      80..BF                  invalid encoding of surrogate code point
+  // U+E000..U+FFFF     EE..EF     80..BF      80..BF
+  //                    F0         80..8F      80..BF     80..BF       invalid overlong encoding
+  // U+10000..U+3FFFF   F0         90..BF      80..BF     80..BF       U+10000..U+10FFFF 4 code unit range
+  // U+40000..U+FFFFF   F1..F3     80..BF      80..BF     80..BF
+  // U+100000..U+10FFFF F4         80..8F      80..BF     80..BF
+  //                    F4         90..BF      80..BF     80..BF       U+110000.. invalid code point range
+  //
+  // Unlike other parsers, these invalid entries are tested after decoding.
+  // - The parser always needs to consume these code units
+  // - The code is optimized for well-formed UTF-8
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr __consume_result __consume() noexcept {
     _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
 
     // Based on the number of leading 1 bits the number of code units in the
@@ -151,64 +162,77 @@
     // https://en.wikipedia.org/wiki/UTF-8#Encoding
     switch (std::countl_one(static_cast<unsigned char>(*__first_))) {
     case 0:
-      return {0, static_cast<unsigned char>(*__first_++)};
+      return {static_cast<unsigned char>(*__first_++)};
 
-    case 2:
-      if (__last_ - __first_ < 2) [[unlikely]]
+    case 2: {
+      if (__last_ - __first_ < 2 || !__unicode::__is_continuation(__first_ + 1, 1)) [[unlikely]]
         break;
 
-      if (__unicode::__is_continuation(__first_ + 1, 1)) {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x1f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        return {0, __value};
-      }
-      break;
+      char32_t __value = static_cast<unsigned char>(*__first_++) & 0x1f;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
 
-    case 3:
-      if (__last_ - __first_ < 3) [[unlikely]]
+      // These values should be encoded in 1 UTF-8 code unit.
+      if (__value < 0x0080) [[unlikely]]
+        return __consume_result_error;
+
+      return {__value};
+    }
+
+    case 3: {
+      if (__last_ - __first_ < 3 || !__unicode::__is_continuation(__first_ + 1, 2)) [[unlikely]]
         break;
 
-      if (__unicode::__is_continuation(__first_ + 1, 2)) {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x0f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        return {0, __value};
-      }
-      break;
+      char32_t __value = static_cast<unsigned char>(*__first_++) & 0x0f;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
 
-    case 4:
-      if (__last_ - __first_ < 4) [[unlikely]]
+      // These values should be encoded in 1 or 2 UTF-8 code units.
+      if (__value < 0x0800) [[unlikely]]
+        return __consume_result_error;
+
+      // A surrogate value is always encoded in 3 UTF-8 code units.
+      if (__unicode::__is_surrogate(__value)) [[unlikely]]
+        return __consume_result_error;
+
+      return {__value};
+    }
+
+    case 4: {
+      if (__last_ - __first_ < 4 || !__unicode::__is_continuation(__first_ + 1, 3)) [[unlikely]]
         break;
 
-      if (__unicode::__is_continuation(__first_ + 1, 3)) {
-        char32_t __value = static_cast<unsigned char>(*__first_++) & 0x07;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
-        __value <<= 6;
-        __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
+      char32_t __value = static_cast<unsigned char>(*__first_++) & 0x07;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
+      __value <<= 6;
+      __value |= static_cast<unsigned char>(*__first_++) & 0x3f;
 
-        if (__value > 0x10FFFF) // Outside the valid Unicode range?
-          return {4, __value};
+      // These values should be encoded in 1, 2, or 3 UTF-8 code units.
+      if (__value < 0x10000) [[unlikely]]
+        return __consume_result_error;
 
-        return {0, __value};
-      }
-      break;
+      // A value too large is always encoded in 4 UTF-8 code units.
+      if (!__unicode::__is_code_point(__value)) [[unlikely]]
+        return __consume_result_error;
+
+      return {__value};
+    }
     }
     // An invalid number of leading ones can be garbage or a code unit in the
     // middle of a code point. By consuming one code unit the parser may get
     // "in sync" after a few code units.
-    return {1, static_cast<unsigned char>(*__first_++)};
+    ++__first_;
+    return __consume_result_error;
   }
-#    endif // _LIBCPP_STD_VER > 20
 
 private:
-  const char* __first_;
-  const char* __last_;
+  _Iterator __first_;
+  _Iterator __last_;
 };
 
 #    ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -225,75 +249,48 @@
 /// - 4 UTF-32 (for example Linux)
 template <>
 class __code_point_view<wchar_t> {
+  using _Iterator = typename basic_string_view<wchar_t>::const_iterator;
+
 public:
   static_assert(sizeof(wchar_t) == 2 || sizeof(wchar_t) == 4, "sizeof(wchar_t) has a not implemented value");
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(const wchar_t* __first, const wchar_t* __last)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(_Iterator __first, _Iterator __last)
       : __first_(__first), __last_(__last) {}
 
-  _LIBCPP_HIDE_FROM_ABI constexpr const wchar_t* __position() const noexcept { return __first_; }
+  _LIBCPP_HIDE_FROM_ABI constexpr _Iterator __position() const noexcept { return __first_; }
   _LIBCPP_HIDE_FROM_ABI constexpr bool __at_end() const noexcept { return __first_ == __last_; }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr char32_t __consume() noexcept {
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr __consume_result __consume() noexcept {
     _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
 
+    char32_t __value = static_cast<char32_t>(*__first_++);
     if constexpr (sizeof(wchar_t) == 2) {
-      char32_t __result = *__first_++;
-      // Is the code unit part of a surrogate pair? See
-      // https://en.wikipedia.org/wiki/UTF-16#U+D800_to_U+DFFF
-      if (__result >= 0xd800 && __result <= 0xDfff) {
-        // Malformed Unicode.
-        if (__first_ == __last_) [[unlikely]]
-          return __replacement_character;
+      if (__unicode::__is_low_surrogate(__value)) [[unlikely]]
+        return __consume_result_error;
 
-        __result -= 0xd800;
-        __result <<= 10;
-        __result += *__first_++ - 0xdc00;
-        __result += 0x10000;
+      if (__unicode::__is_high_surrogate(__value)) {
+        if (__first_ == __last_ || !__unicode::__is_low_surrogate(static_cast<char32_t>(*__first_))) [[unlikely]]
+          return __consume_result_error;
+
+        __value -= 0xd800;
+        __value <<= 10;
+        __value += static_cast<char32_t>(*__first_++) - 0xdc00;
+        __value += 0x10000;
+
+        if (!__unicode::__is_code_point(__value)) [[unlikely]]
+          return __consume_result_error;
       }
-      return __result;
-
-    } else if constexpr (sizeof(wchar_t) == 4) {
-      char32_t __result = *__first_++;
-      if (__result > 0x10FFFF) [[unlikely]]
-        return __replacement_character;
-      return __result;
     } else {
-      __libcpp_unreachable();
-    }
-  }
-
-#      if _LIBCPP_STD_VER > 20
-  _LIBCPP_HIDE_FROM_ABI constexpr __consume_p2286_result __consume_p2286() noexcept {
-    _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
-
-    char32_t __result = *__first_++;
-    if constexpr (sizeof(wchar_t) == 2) {
-      // https://en.wikipedia.org/wiki/UTF-16#U+D800_to_U+DFFF
-      if (__is_surrogate_pair_high(__result)) {
-        // Malformed Unicode.
-        if (__first_ == __last_ || !__is_surrogate_pair_low(*(__first_ + 1))) [[unlikely]]
-          return {1, __result};
-
-        __result -= 0xd800;
-        __result <<= 10;
-        __result += *__first_++ - 0xdc00;
-        __result += 0x10000;
-      } else if (__is_surrogate_pair_low(__result))
-        // A code point shouldn't start with the low surrogate pair
-        return {1, __result};
-    } else {
-      if (__result > 0x10FFFF) [[unlikely]]
-        return {1, __result};
+      if (!__unicode::__is_scalar_value(__value)) [[unlikely]]
+        return __consume_result_error;
     }
 
-    return {0, __result};
+    return {__value};
   }
-#      endif // _LIBCPP_STD_VER > 20
 
 private:
-  const wchar_t* __first_;
-  const wchar_t* __last_;
+  _Iterator __first_;
+  _Iterator __last_;
 };
 #    endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
@@ -384,10 +381,12 @@
 /// Therefore only this code point is extracted.
 template <class _CharT>
 class __extended_grapheme_cluster_view {
+  using _Iterator = typename basic_string_view<_CharT>::const_iterator;
+
 public:
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __extended_grapheme_cluster_view(const _CharT* __first, const _CharT* __last)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __extended_grapheme_cluster_view(_Iterator __first, _Iterator __last)
       : __code_point_view_(__first, __last),
-        __next_code_point_(__code_point_view_.__consume()),
+        __next_code_point_(__code_point_view_.__consume().__code_point),
         __next_prop_(__extended_grapheme_custer_property_boundary::__get_property(__next_code_point_)) {}
 
   struct __cluster {
@@ -401,13 +400,14 @@
     ///
     /// It's expected the caller has the start position and thus can determine
     /// the code unit range of the extended grapheme cluster.
-    const _CharT* __last_;
+    _Iterator __last_;
   };
 
   _LIBCPP_HIDE_FROM_ABI constexpr __cluster __consume() {
     _LIBCPP_ASSERT(
         __next_prop_ != __extended_grapheme_custer_property_boundary::__property::__eot,
         "can't move beyond the end of input");
+
     char32_t __code_point = __next_code_point_;
     if (!__code_point_view_.__at_end())
       return {__code_point, __get_break()};
@@ -422,17 +422,17 @@
   char32_t __next_code_point_;
   __extended_grapheme_custer_property_boundary::__property __next_prop_;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __get_break() {
+  _LIBCPP_HIDE_FROM_ABI constexpr _Iterator __get_break() {
     bool __ri_break_allowed         = true;
     bool __has_extened_pictographic = false;
     while (true) {
-      const _CharT* __result                                          = __code_point_view_.__position();
+      _Iterator __result                                              = __code_point_view_.__position();
       __extended_grapheme_custer_property_boundary::__property __prev = __next_prop_;
       if (__code_point_view_.__at_end()) {
         __next_prop_ = __extended_grapheme_custer_property_boundary::__property::__eot;
         return __result;
       }
-      __next_code_point_ = __code_point_view_.__consume();
+      __next_code_point_ = __code_point_view_.__consume().__code_point;
       __next_prop_       = __extended_grapheme_custer_property_boundary::__get_property(__next_code_point_);
 
       __has_extened_pictographic |=
@@ -444,8 +444,8 @@
   }
 };
 
-template <class _CharT>
-__extended_grapheme_cluster_view(const _CharT*, const _CharT*) -> __extended_grapheme_cluster_view<_CharT>;
+template <contiguous_iterator _Iterator>
+__extended_grapheme_cluster_view(_Iterator, _Iterator) -> __extended_grapheme_cluster_view<iter_value_t<_Iterator>>;
 
 #  else //  _LIBCPP_HAS_NO_UNICODE
 
@@ -453,36 +453,30 @@
 // This makes it easier to write code agnostic of the _LIBCPP_HAS_NO_UNICODE define.
 template <class _CharT>
 class __code_point_view {
+  using _Iterator = typename basic_string_view<_CharT>::const_iterator;
+
 public:
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(const _CharT* __first, const _CharT* __last)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __code_point_view(_Iterator __first, _Iterator __last)
       : __first_(__first), __last_(__last) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr bool __at_end() const noexcept { return __first_ == __last_; }
-  _LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __position() const noexcept { return __first_; }
+  _LIBCPP_HIDE_FROM_ABI constexpr _Iterator __position() const noexcept { return __first_; }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr char32_t __consume() noexcept {
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr __consume_result __consume() noexcept {
     _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
-    return *__first_++;
+    return {static_cast<char32_t>(*__first_++)};
   }
 
-#    if _LIBCPP_STD_VER > 20
-  _LIBCPP_HIDE_FROM_ABI constexpr __consume_p2286_result __consume_p2286() noexcept {
-    _LIBCPP_ASSERT(__first_ != __last_, "can't move beyond the end of input");
-
-    return {0, std::make_unsigned_t<_CharT>(*__first_++)};
-  }
-#    endif // _LIBCPP_STD_VER > 20
-
 private:
-  const _CharT* __first_;
-  const _CharT* __last_;
+  _Iterator __first_;
+  _Iterator __last_;
 };
 
 #  endif //  _LIBCPP_HAS_NO_UNICODE
 
 } // namespace __unicode
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/bind.h b/third_party/llvm-project/libcxx/include/__functional/bind.h
index 297e4e5..71ca6bd 100644
--- a/third_party/llvm-project/libcxx/include/__functional/bind.h
+++ b/third_party/llvm-project/libcxx/include/__functional/bind.h
@@ -15,7 +15,6 @@
 #include <__functional/weak_result_type.h>
 #include <cstddef>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -30,9 +29,9 @@
     is_bind_expression<__remove_cvref_t<_Tp> >
 > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
-inline constexpr size_t is_bind_expression_v = is_bind_expression<_Tp>::value;
+inline constexpr bool is_bind_expression_v = is_bind_expression<_Tp>::value;
 #endif
 
 template<class _Tp>
@@ -42,9 +41,9 @@
     is_placeholder<__remove_cvref_t<_Tp> >
 > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
-inline constexpr size_t is_placeholder_v = is_placeholder<_Tp>::value;
+inline constexpr int is_placeholder_v = is_placeholder<_Tp>::value;
 #endif
 
 namespace placeholders
@@ -132,8 +131,8 @@
 >::type
 __mu(_Ti&, _Uj& __uj)
 {
-    const size_t _Indx = is_placeholder<_Ti>::value - 1;
-    return _VSTD::forward<typename tuple_element<_Indx, _Uj>::type>(_VSTD::get<_Indx>(__uj));
+    const size_t __indx = is_placeholder<_Ti>::value - 1;
+    return _VSTD::forward<typename tuple_element<__indx, _Uj>::type>(_VSTD::get<__indx>(__uj));
 }
 
 template <class _Ti, class _Uj>
@@ -264,11 +263,11 @@
 }
 
 template<class _Fp, class ..._BoundArgs>
-class __bind : public __weak_result_type<typename decay<_Fp>::type>
+class __bind : public __weak_result_type<__decay_t<_Fp> >
 {
 protected:
-    typedef typename decay<_Fp>::type _Fd;
-    typedef tuple<typename decay<_BoundArgs>::type...> _Td;
+    using _Fd = __decay_t<_Fp>;
+    typedef tuple<__decay_t<_BoundArgs>...> _Td;
 private:
     _Fd __f_;
     _Td __bound_args_;
diff --git a/third_party/llvm-project/libcxx/include/__functional/bind_back.h b/third_party/llvm-project/libcxx/include/__functional/bind_back.h
index f0a6e49..544315d 100644
--- a/third_party/llvm-project/libcxx/include/__functional/bind_back.h
+++ b/third_party/llvm-project/libcxx/include/__functional/bind_back.h
@@ -16,7 +16,6 @@
 #include <__utility/forward.h>
 #include <__utility/integer_sequence.h>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -24,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <size_t _NBound, class = make_index_sequence<_NBound>>
 struct __bind_back_op;
@@ -57,7 +56,7 @@
     -> decltype(      __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)))
     { return          __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)); }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/bind_front.h b/third_party/llvm-project/libcxx/include/__functional/bind_front.h
index 22fb3a6..109a83c 100644
--- a/third_party/llvm-project/libcxx/include/__functional/bind_front.h
+++ b/third_party/llvm-project/libcxx/include/__functional/bind_front.h
@@ -14,7 +14,6 @@
 #include <__functional/invoke.h>
 #include <__functional/perfect_forward.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 struct __bind_front_op {
     template <class ..._Args>
@@ -51,7 +50,7 @@
     return __bind_front_t<decay_t<_Fn>, decay_t<_Args>...>(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/boyer_moore_searcher.h b/third_party/llvm-project/libcxx/include/__functional/boyer_moore_searcher.h
index a675089..1e2d861 100644
--- a/third_party/llvm-project/libcxx/include/__functional/boyer_moore_searcher.h
+++ b/third_party/llvm-project/libcxx/include/__functional/boyer_moore_searcher.h
@@ -25,7 +25,7 @@
 #include <unordered_map>
 #include <vector>
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
@@ -310,6 +310,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___FUNCTIONAL_BOYER_MOORE_SEARCHER_H
diff --git a/third_party/llvm-project/libcxx/include/__functional/compose.h b/third_party/llvm-project/libcxx/include/__functional/compose.h
index 25213f2..168131e 100644
--- a/third_party/llvm-project/libcxx/include/__functional/compose.h
+++ b/third_party/llvm-project/libcxx/include/__functional/compose.h
@@ -14,7 +14,6 @@
 #include <__functional/invoke.h>
 #include <__functional/perfect_forward.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 struct __compose_op {
     template<class _Fn1, class _Fn2, class ..._Args>
@@ -45,7 +44,7 @@
     -> decltype(      __compose_t<decay_t<_Fn1>, decay_t<_Fn2>>(_VSTD::forward<_Fn1>(__f1), _VSTD::forward<_Fn2>(__f2)))
     { return          __compose_t<decay_t<_Fn1>, decay_t<_Fn2>>(_VSTD::forward<_Fn1>(__f1), _VSTD::forward<_Fn2>(__f2)); }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/default_searcher.h b/third_party/llvm-project/libcxx/include/__functional/default_searcher.h
index e4151e5..222b4c6 100644
--- a/third_party/llvm-project/libcxx/include/__functional/default_searcher.h
+++ b/third_party/llvm-project/libcxx/include/__functional/default_searcher.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 // default searcher
 template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
@@ -50,7 +50,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(default_searcher);
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/function.h b/third_party/llvm-project/libcxx/include/__functional/function.h
index ca79d33..70ae6d1 100644
--- a/third_party/llvm-project/libcxx/include/__functional/function.h
+++ b/third_party/llvm-project/libcxx/include/__functional/function.h
@@ -12,6 +12,7 @@
 
 #include <__assert>
 #include <__config>
+#include <__exception/exception.h>
 #include <__functional/binary_function.h>
 #include <__functional/invoke.h>
 #include <__functional/unary_function.h>
@@ -23,15 +24,17 @@
 #include <__memory/builtin_new_allocator.h>
 #include <__memory/compressed_pair.h>
 #include <__memory/unique_ptr.h>
+#include <__type_traits/aligned_storage.h>
+#include <__type_traits/is_trivially_copy_constructible.h>
+#include <__type_traits/is_trivially_destructible.h>
 #include <__type_traits/strip_signature.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/piecewise_construct.h>
 #include <__utility/swap.h>
-#include <exception>
+#include <__verbose_abort>
 #include <new>
 #include <tuple>
-#include <type_traits>
 #include <typeinfo>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -68,10 +71,10 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_function_call()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_function_call();
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_function_call was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -268,10 +271,10 @@
     virtual void destroy() _NOEXCEPT = 0;
     virtual void destroy_deallocate() _NOEXCEPT = 0;
     virtual _Rp operator()(_ArgTypes&& ...) = 0;
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     virtual const void* target(const type_info&) const _NOEXCEPT = 0;
     virtual const std::type_info& target_type() const _NOEXCEPT = 0;
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 // __func implements __base for a given functor type.
@@ -305,10 +308,10 @@
     virtual void destroy() _NOEXCEPT;
     virtual void destroy_deallocate() _NOEXCEPT;
     virtual _Rp operator()(_ArgTypes&&... __arg);
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     virtual const void* target(const type_info&) const _NOEXCEPT;
     virtual const std::type_info& target_type() const _NOEXCEPT;
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
@@ -356,7 +359,7 @@
     return __f_(_VSTD::forward<_ArgTypes>(__arg)...);
 }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
 
 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
 const void*
@@ -374,7 +377,7 @@
     return typeid(_Fp);
 }
 
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 
 // __value_func creates a value-type from a __func.
 
@@ -427,7 +430,7 @@
     }
 
     template <class _Fp,
-        class = typename enable_if<!is_same<typename decay<_Fp>::type, __value_func>::value>::type>
+        class = typename enable_if<!is_same<__decay_t<_Fp>, __value_func>::value>::type>
     _LIBCPP_INLINE_VISIBILITY explicit __value_func(_Fp&& __f)
         : __value_func(_VSTD::forward<_Fp>(__f), allocator<_Fp>()) {}
 
@@ -553,7 +556,7 @@
     _LIBCPP_INLINE_VISIBILITY
     explicit operator bool() const _NOEXCEPT { return __f_ != nullptr; }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     _LIBCPP_INLINE_VISIBILITY
     const std::type_info& target_type() const _NOEXCEPT
     {
@@ -569,7 +572,7 @@
             return nullptr;
         return (const _Tp*)__f_->target(typeid(_Tp));
     }
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 // Storage for a functor object, to be used with __policy to manage copy and
@@ -614,15 +617,15 @@
     _LIBCPP_INLINE_VISIBILITY
     static const __policy* __create_empty()
     {
-        static const _LIBCPP_CONSTEXPR __policy __policy_ = {nullptr, nullptr,
-                                                             true,
-#ifndef _LIBCPP_NO_RTTI
-                                                             &typeid(void)
+        static const _LIBCPP_CONSTEXPR __policy __policy = {nullptr, nullptr,
+                                                            true,
+#ifndef _LIBCPP_HAS_NO_RTTI
+                                                            &typeid(void)
 #else
-                                                             nullptr
+                                                            nullptr
 #endif
         };
-        return &__policy_;
+        return &__policy;
     }
 
   private:
@@ -640,30 +643,30 @@
     template <typename _Fun>
     _LIBCPP_INLINE_VISIBILITY static const __policy*
     __choose_policy(/* is_small = */ false_type) {
-      static const _LIBCPP_CONSTEXPR __policy __policy_ = {
+      static const _LIBCPP_CONSTEXPR __policy __policy = {
           &__large_clone<_Fun>, &__large_destroy<_Fun>, false,
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
           &typeid(typename _Fun::_Target)
 #else
           nullptr
 #endif
       };
-        return &__policy_;
+        return &__policy;
     }
 
     template <typename _Fun>
     _LIBCPP_INLINE_VISIBILITY static const __policy*
         __choose_policy(/* is_small = */ true_type)
     {
-        static const _LIBCPP_CONSTEXPR __policy __policy_ = {
+        static const _LIBCPP_CONSTEXPR __policy __policy = {
             nullptr, nullptr, false,
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
             &typeid(typename _Fun::_Target)
 #else
             nullptr
 #endif
         };
-        return &__policy_;
+        return &__policy;
     }
 };
 
@@ -770,7 +773,7 @@
         }
     }
 
-    template <class _Fp, class = typename enable_if<!is_same<typename decay<_Fp>::type, __policy_func>::value>::type>
+    template <class _Fp, class = typename enable_if<!is_same<__decay_t<_Fp>, __policy_func>::value>::type>
     _LIBCPP_INLINE_VISIBILITY explicit __policy_func(_Fp&& __f)
         : __policy_(__policy::__create_empty()) {
       typedef __default_alloc_func<_Fp, _Rp(_ArgTypes...)> _Fun;
@@ -861,7 +864,7 @@
         return !__policy_->__is_null;
     }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     _LIBCPP_INLINE_VISIBILITY
     const std::type_info& target_type() const _NOEXCEPT
     {
@@ -878,7 +881,7 @@
         else
             return reinterpret_cast<const _Tp*>(&__buf_.__small);
     }
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 #if defined(_LIBCPP_HAS_BLOCKS_RUNTIME)
@@ -945,7 +948,7 @@
         return _VSTD::__invoke(__f_, _VSTD::forward<_ArgTypes>(__arg)...);
     }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     virtual const void* target(type_info const& __ti) const _NOEXCEPT {
         if (__ti == typeid(__func::__block_type))
             return &__f_;
@@ -955,7 +958,7 @@
     virtual const std::type_info& target_type() const _NOEXCEPT {
         return typeid(__func::__block_type);
     }
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 #endif // _LIBCPP_HAS_EXTENSION_BLOCKS
@@ -1026,7 +1029,7 @@
     function& operator=(const function&);
     function& operator=(function&&) _NOEXCEPT;
     function& operator=(nullptr_t) _NOEXCEPT;
-    template<class _Fp, class = _EnableIfLValueCallable<typename decay<_Fp>::type>>
+    template<class _Fp, class = _EnableIfLValueCallable<__decay_t<_Fp>>>
     function& operator=(_Fp&&);
 
     ~function();
@@ -1056,12 +1059,12 @@
     // function invocation:
     _Rp operator()(_ArgTypes...) const;
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     // function target access:
     const std::type_info& target_type() const _NOEXCEPT;
     template <typename _Tp> _Tp* target() _NOEXCEPT;
     template <typename _Tp> const _Tp* target() const _NOEXCEPT;
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 };
 
 #if _LIBCPP_STD_VER >= 17
@@ -1156,7 +1159,7 @@
     return __f_(_VSTD::forward<_ArgTypes>(__arg)...);
 }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
 
 template<class _Rp, class ..._ArgTypes>
 const std::type_info&
@@ -1181,7 +1184,7 @@
     return __f_.template target<_Tp>();
 }
 
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 
 template <class _Rp, class... _ArgTypes>
 inline _LIBCPP_INLINE_VISIBILITY
diff --git a/third_party/llvm-project/libcxx/include/__functional/hash.h b/third_party/llvm-project/libcxx/include/__functional/hash.h
index dfd8ea2..fec7f75 100644
--- a/third_party/llvm-project/libcxx/include/__functional/hash.h
+++ b/third_party/llvm-project/libcxx/include/__functional/hash.h
@@ -13,7 +13,7 @@
 #include <__functional/invoke.h>
 #include <__functional/unary_function.h>
 #include <__fwd/hash.h>
-#include <__tuple_dir/sfinae_helpers.h>
+#include <__tuple/sfinae_helpers.h>
 #include <__type_traits/is_copy_constructible.h>
 #include <__type_traits/is_default_constructible.h>
 #include <__type_traits/is_enum.h>
@@ -35,7 +35,7 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 _Size
 __loadword(const void* __p)
 {
@@ -53,50 +53,88 @@
 template <class _Size>
 struct __murmur2_or_cityhash<_Size, 32>
 {
-    inline _Size operator()(const void* __key, _Size __len)
-         _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+    _Size operator()(const void* __key, _Size __len) const {
+      // murmur2
+      const _Size __m = 0x5bd1e995;
+      const _Size __r = 24;
+      _Size __h = __len;
+      const unsigned char* __data = static_cast<const unsigned char*>(__key);
+      for (; __len >= 4; __data += 4, __len -= 4)
+      {
+          _Size __k = std::__loadword<_Size>(__data);
+          __k *= __m;
+          __k ^= __k >> __r;
+          __k *= __m;
+          __h *= __m;
+          __h ^= __k;
+      }
+      switch (__len)
+      {
+      case 3:
+          __h ^= static_cast<_Size>(__data[2] << 16);
+          _LIBCPP_FALLTHROUGH();
+      case 2:
+          __h ^= static_cast<_Size>(__data[1] << 8);
+          _LIBCPP_FALLTHROUGH();
+      case 1:
+          __h ^= __data[0];
+          __h *= __m;
+      }
+      __h ^= __h >> 13;
+      __h *= __m;
+      __h ^= __h >> 15;
+      return __h;
+    }
 };
 
-// murmur2
-template <class _Size>
-_Size
-__murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
-{
-    const _Size __m = 0x5bd1e995;
-    const _Size __r = 24;
-    _Size __h = __len;
-    const unsigned char* __data = static_cast<const unsigned char*>(__key);
-    for (; __len >= 4; __data += 4, __len -= 4)
-    {
-        _Size __k = std::__loadword<_Size>(__data);
-        __k *= __m;
-        __k ^= __k >> __r;
-        __k *= __m;
-        __h *= __m;
-        __h ^= __k;
-    }
-    switch (__len)
-    {
-    case 3:
-        __h ^= static_cast<_Size>(__data[2] << 16);
-        _LIBCPP_FALLTHROUGH();
-    case 2:
-        __h ^= static_cast<_Size>(__data[1] << 8);
-        _LIBCPP_FALLTHROUGH();
-    case 1:
-        __h ^= __data[0];
-        __h *= __m;
-    }
-    __h ^= __h >> 13;
-    __h *= __m;
-    __h ^= __h >> 15;
-    return __h;
-}
-
 template <class _Size>
 struct __murmur2_or_cityhash<_Size, 64>
 {
-    inline _Size operator()(const void* __key, _Size __len)  _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
+  // cityhash64
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+  _Size operator()(const void* __key, _Size __len) const {
+    const char* __s = static_cast<const char*>(__key);
+    if (__len <= 32) {
+        if (__len <= 16) {
+        return __hash_len_0_to_16(__s, __len);
+        } else {
+        return __hash_len_17_to_32(__s, __len);
+        }
+    } else if (__len <= 64) {
+        return __hash_len_33_to_64(__s, __len);
+    }
+
+    // For strings over 64 bytes we hash the end first, and then as we
+    // loop we keep 56 bytes of state: v, w, x, y, and z.
+    _Size __x = std::__loadword<_Size>(__s + __len - 40);
+    _Size __y = std::__loadword<_Size>(__s + __len - 16) +
+                std::__loadword<_Size>(__s + __len - 56);
+    _Size __z = __hash_len_16(std::__loadword<_Size>(__s + __len - 48) + __len,
+                            std::__loadword<_Size>(__s + __len - 24));
+    pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
+    pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
+    __x = __x * __k1 + std::__loadword<_Size>(__s);
+
+    // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
+    __len = (__len - 1) & ~static_cast<_Size>(63);
+    do {
+        __x = __rotate(__x + __y + __v.first + std::__loadword<_Size>(__s + 8), 37) * __k1;
+        __y = __rotate(__y + __v.second + std::__loadword<_Size>(__s + 48), 42) * __k1;
+        __x ^= __w.second;
+        __y += __v.first + std::__loadword<_Size>(__s + 40);
+        __z = __rotate(__z + __w.first, 33) * __k1;
+        __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
+        __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
+                                            __y + std::__loadword<_Size>(__s + 16));
+        _VSTD::swap(__z, __x);
+        __s += 64;
+        __len -= 64;
+    } while (__len != 0);
+    return __hash_len_16(
+        __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
+        __hash_len_16(__v.second, __w.second) + __x);
+  }
 
  private:
   // Some primes between 2^63 and 2^64.
@@ -105,21 +143,23 @@
   static const _Size __k2 = 0x9ae16a3b2f90404fULL;
   static const _Size __k3 = 0xc949d7c7509e6557ULL;
 
+  _LIBCPP_HIDE_FROM_ABI
   static _Size __rotate(_Size __val, int __shift) {
     return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
   }
 
+  _LIBCPP_HIDE_FROM_ABI
   static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
     return (__val >> __shift) | (__val << (64 - __shift));
   }
 
+  _LIBCPP_HIDE_FROM_ABI
   static _Size __shift_mix(_Size __val) {
     return __val ^ (__val >> 47);
   }
 
-  static _Size __hash_len_16(_Size __u, _Size __v)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+  static _Size __hash_len_16(_Size __u, _Size __v) {
     const _Size __mul = 0x9ddfea08eb382d69ULL;
     _Size __a = (__u ^ __v) * __mul;
     __a ^= (__a >> 47);
@@ -129,9 +169,8 @@
     return __b;
   }
 
-  static _Size __hash_len_0_to_16(const char* __s, _Size __len)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+  static _Size __hash_len_0_to_16(const char* __s, _Size __len) {
     if (__len > 8) {
       const _Size __a = std::__loadword<_Size>(__s);
       const _Size __b = std::__loadword<_Size>(__s + __len - 8);
@@ -140,7 +179,11 @@
     if (__len >= 4) {
       const uint32_t __a = std::__loadword<uint32_t>(__s);
       const uint32_t __b = std::__loadword<uint32_t>(__s + __len - 4);
+#ifdef _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION
       return __hash_len_16(__len + (static_cast<_Size>(__a) << 3), __b);
+#else
+      return __hash_len_16(__len + (__a << 3), __b);
+#endif
     }
     if (__len > 0) {
       const unsigned char __a = static_cast<unsigned char>(__s[0]);
@@ -154,9 +197,8 @@
     return __k2;
   }
 
-  static _Size __hash_len_17_to_32(const char *__s, _Size __len)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+  static _Size __hash_len_17_to_32(const char *__s, _Size __len) {
     const _Size __a = std::__loadword<_Size>(__s) * __k1;
     const _Size __b = std::__loadword<_Size>(__s + 8);
     const _Size __c = std::__loadword<_Size>(__s + __len - 8) * __k2;
@@ -167,9 +209,9 @@
 
   // Return a 16-byte hash for 48 bytes.  Quick and dirty.
   // Callers do best to use "random-looking" values for a and b.
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
   static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
       _Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b)
-        _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
   {
     __a += __w;
     __b = __rotate(__b + __a + __z, 21);
@@ -181,9 +223,9 @@
   }
 
   // Return a 16-byte hash for s[0] ... s[31], a, and b.  Quick and dirty.
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
   static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
       const char* __s, _Size __a, _Size __b)
-    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
   {
     return __weak_hash_len_32_with_seeds(std::__loadword<_Size>(__s),
                                          std::__loadword<_Size>(__s + 8),
@@ -194,9 +236,8 @@
   }
 
   // Return an 8-byte hash for 33 to 64 bytes.
-  static _Size __hash_len_33_to_64(const char *__s, size_t __len)
-    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
+  static _Size __hash_len_33_to_64(const char *__s, size_t __len) {
     _Size __z = std::__loadword<_Size>(__s + 24);
     _Size __a = std::__loadword<_Size>(__s) +
                 (__len + std::__loadword<_Size>(__s + __len - 16)) * __k0;
@@ -221,53 +262,6 @@
   }
 };
 
-// cityhash64
-template <class _Size>
-_Size
-__murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)
-{
-  const char* __s = static_cast<const char*>(__key);
-  if (__len <= 32) {
-    if (__len <= 16) {
-      return __hash_len_0_to_16(__s, __len);
-    } else {
-      return __hash_len_17_to_32(__s, __len);
-    }
-  } else if (__len <= 64) {
-    return __hash_len_33_to_64(__s, __len);
-  }
-
-  // For strings over 64 bytes we hash the end first, and then as we
-  // loop we keep 56 bytes of state: v, w, x, y, and z.
-  _Size __x = std::__loadword<_Size>(__s + __len - 40);
-  _Size __y = std::__loadword<_Size>(__s + __len - 16) +
-              std::__loadword<_Size>(__s + __len - 56);
-  _Size __z = __hash_len_16(std::__loadword<_Size>(__s + __len - 48) + __len,
-                          std::__loadword<_Size>(__s + __len - 24));
-  pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
-  pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
-  __x = __x * __k1 + std::__loadword<_Size>(__s);
-
-  // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
-  __len = (__len - 1) & ~static_cast<_Size>(63);
-  do {
-    __x = __rotate(__x + __y + __v.first + std::__loadword<_Size>(__s + 8), 37) * __k1;
-    __y = __rotate(__y + __v.second + std::__loadword<_Size>(__s + 48), 42) * __k1;
-    __x ^= __w.second;
-    __y += __v.first + std::__loadword<_Size>(__s + 40);
-    __z = __rotate(__z + __w.first, 33) * __k1;
-    __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
-    __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
-                                        __y + std::__loadword<_Size>(__s + 16));
-    _VSTD::swap(__z, __x);
-    __s += 64;
-    __len -= 64;
-  } while (__len != 0);
-  return __hash_len_16(
-      __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
-      __hash_len_16(__v.second, __w.second) + __x);
-}
-
 template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)>
 struct __scalar_hash;
 
@@ -275,7 +269,7 @@
 struct __scalar_hash<_Tp, 0>
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         union
@@ -293,7 +287,7 @@
 struct __scalar_hash<_Tp, 1>
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         union
@@ -310,7 +304,7 @@
 struct __scalar_hash<_Tp, 2>
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         union
@@ -331,7 +325,7 @@
 struct __scalar_hash<_Tp, 3>
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         union
@@ -353,7 +347,7 @@
 struct __scalar_hash<_Tp, 4>
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         union
@@ -377,7 +371,7 @@
   size_t second;
 };
 
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_HIDE_FROM_ABI
 inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT {
     typedef __scalar_hash<_PairT> _HashT;
     const _PairT __p = {__lhs, __rhs};
@@ -388,7 +382,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<_Tp*>
     : public __unary_function<_Tp*, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp* __v) const _NOEXCEPT
     {
         union
@@ -405,7 +399,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<bool>
     : public __unary_function<bool, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -413,7 +407,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<char>
     : public __unary_function<char, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -421,7 +415,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<signed char>
     : public __unary_function<signed char, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -429,7 +423,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
     : public __unary_function<unsigned char, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -438,7 +432,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<char8_t>
     : public __unary_function<char8_t, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(char8_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 #endif // !_LIBCPP_HAS_NO_CHAR8_T
@@ -447,7 +441,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<char16_t>
     : public __unary_function<char16_t, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -455,7 +449,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<char32_t>
     : public __unary_function<char32_t, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -464,7 +458,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<wchar_t>
     : public __unary_function<wchar_t, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -473,7 +467,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<short>
     : public __unary_function<short, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -481,7 +475,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
     : public __unary_function<unsigned short, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -489,7 +483,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<int>
     : public __unary_function<int, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -497,7 +491,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
     : public __unary_function<unsigned int, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -505,7 +499,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<long>
     : public __unary_function<long, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -513,7 +507,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
     : public __unary_function<unsigned long, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
 };
 
@@ -549,7 +543,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<float>
     : public __scalar_hash<float>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(float __v) const _NOEXCEPT
     {
         // -0.0 and 0.0 should return same hash
@@ -563,7 +557,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<double>
     : public __scalar_hash<double>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(double __v) const _NOEXCEPT
     {
         // -0.0 and 0.0 should return same hash
@@ -577,7 +571,7 @@
 struct _LIBCPP_TEMPLATE_VIS hash<long double>
     : public __scalar_hash<long double>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(long double __v) const _NOEXCEPT
     {
         // -0.0 and 0.0 should return same hash
@@ -627,7 +621,7 @@
 struct _LIBCPP_TEMPLATE_VIS __enum_hash
     : public __unary_function<_Tp, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(_Tp __v) const _NOEXCEPT
     {
         typedef typename underlying_type<_Tp>::type type;
@@ -646,13 +640,13 @@
 {
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <>
 struct _LIBCPP_TEMPLATE_VIS hash<nullptr_t>
   : public __unary_function<nullptr_t, size_t>
 {
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     size_t operator()(nullptr_t) const _NOEXCEPT {
         return 662607004ull;
     }
@@ -673,7 +667,7 @@
     is_default_constructible<_Hash>::value
 >;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Type, class>
 using __enable_hash_helper_imp _LIBCPP_NODEBUG = _Type;
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/identity.h b/third_party/llvm-project/libcxx/include/__functional/identity.h
index 2fe3acc..421ba2f 100644
--- a/third_party/llvm-project/libcxx/include/__functional/identity.h
+++ b/third_party/llvm-project/libcxx/include/__functional/identity.h
@@ -11,6 +11,7 @@
 #define _LIBCPP___FUNCTIONAL_IDENTITY_H
 
 #include <__config>
+#include <__type_traits/integral_constant.h>
 #include <__utility/forward.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -19,6 +20,9 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+template <class _Tp>
+struct __is_identity : false_type {};
+
 struct __identity {
   template <class _Tp>
   _LIBCPP_NODISCARD _LIBCPP_CONSTEXPR _Tp&& operator()(_Tp&& __t) const _NOEXCEPT {
@@ -28,7 +32,10 @@
   using is_transparent = void;
 };
 
-#if _LIBCPP_STD_VER > 17
+template <>
+struct __is_identity<__identity> : true_type {};
+
+#if _LIBCPP_STD_VER >= 20
 
 struct identity {
     template<class _Tp>
@@ -39,7 +46,11 @@
 
     using is_transparent = void;
 };
-#endif // _LIBCPP_STD_VER > 17
+
+template <>
+struct __is_identity<identity> : true_type {};
+
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/invoke.h b/third_party/llvm-project/libcxx/include/__functional/invoke.h
index 48e6eac..82fd18d 100644
--- a/third_party/llvm-project/libcxx/include/__functional/invoke.h
+++ b/third_party/llvm-project/libcxx/include/__functional/invoke.h
@@ -266,8 +266,8 @@
 };
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type,
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0>,
          class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
 using __enable_if_bullet1 = typename enable_if
     <
@@ -276,8 +276,8 @@
     >::type;
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type>
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0> >
 using __enable_if_bullet2 = typename enable_if
     <
         is_member_function_pointer<_DecayFp>::value
@@ -285,8 +285,8 @@
     >::type;
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type,
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0>,
          class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
 using __enable_if_bullet3 = typename enable_if
     <
@@ -296,8 +296,8 @@
     >::type;
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type,
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0>,
          class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
 using __enable_if_bullet4 = typename enable_if
     <
@@ -306,8 +306,8 @@
     >::type;
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type>
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0> >
 using __enable_if_bullet5 = typename enable_if
     <
         is_member_object_pointer<_DecayFp>::value
@@ -315,8 +315,8 @@
     >::type;
 
 template <class _Fp, class _A0,
-         class _DecayFp = typename decay<_Fp>::type,
-         class _DecayA0 = typename decay<_A0>::type,
+         class _DecayFp = __decay_t<_Fp>,
+         class _DecayA0 = __decay_t<_A0>,
          class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
 using __enable_if_bullet6 = typename enable_if
     <
@@ -488,7 +488,7 @@
     }
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 // is_invocable
 
@@ -539,7 +539,26 @@
     return _VSTD::__invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
+
+#if _LIBCPP_STD_VER >= 23
+template <class _Result, class _Fn, class... _Args>
+  requires is_invocable_r_v<_Result, _Fn, _Args...>
+_LIBCPP_HIDE_FROM_ABI constexpr _Result
+invoke_r(_Fn&& __f, _Args&&... __args) noexcept(is_nothrow_invocable_r_v<_Result, _Fn, _Args...>) {
+    if constexpr (is_void_v<_Result>) {
+        static_cast<void>(std::invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...));
+    } else {
+        // TODO: Use reference_converts_from_temporary_v once implemented
+        // using _ImplicitInvokeResult = invoke_result_t<_Fn, _Args...>;
+        // static_assert(!reference_converts_from_temporary_v<_Result, _ImplicitInvokeResult>,
+        static_assert(true,
+            "Returning from invoke_r would bind a temporary object to the reference return type, "
+            "which would result in a dangling reference.");
+        return std::invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...);
+    }
+}
+#endif
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/is_transparent.h b/third_party/llvm-project/libcxx/include/__functional/is_transparent.h
index c7a0ee9..c539a07 100644
--- a/third_party/llvm-project/libcxx/include/__functional/is_transparent.h
+++ b/third_party/llvm-project/libcxx/include/__functional/is_transparent.h
@@ -11,7 +11,8 @@
 #define _LIBCPP___FUNCTIONAL_IS_TRANSPARENT
 
 #include <__config>
-#include <type_traits>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/void_t.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -19,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template <class _Tp, class, class = void>
 struct __is_transparent : false_type {};
diff --git a/third_party/llvm-project/libcxx/include/__functional/mem_fn.h b/third_party/llvm-project/libcxx/include/__functional/mem_fn.h
index 8b51627..fe221dd 100644
--- a/third_party/llvm-project/libcxx/include/__functional/mem_fn.h
+++ b/third_party/llvm-project/libcxx/include/__functional/mem_fn.h
@@ -15,7 +15,6 @@
 #include <__functional/invoke.h>
 #include <__functional/weak_result_type.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__functional/not_fn.h b/third_party/llvm-project/libcxx/include/__functional/not_fn.h
index 79d9a87..f148a40 100644
--- a/third_party/llvm-project/libcxx/include/__functional/not_fn.h
+++ b/third_party/llvm-project/libcxx/include/__functional/not_fn.h
@@ -14,7 +14,6 @@
 #include <__functional/invoke.h>
 #include <__functional/perfect_forward.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 struct __not_fn_op {
     template <class... _Args>
@@ -47,7 +46,7 @@
     return __not_fn_t<decay_t<_Fn>>(_VSTD::forward<_Fn>(__f));
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/operations.h b/third_party/llvm-project/libcxx/include/__functional/operations.h
index 8a781ef..3d0c364 100644
--- a/third_party/llvm-project/libcxx/include/__functional/operations.h
+++ b/third_party/llvm-project/libcxx/include/__functional/operations.h
@@ -13,6 +13,8 @@
 #include <__config>
 #include <__functional/binary_function.h>
 #include <__functional/unary_function.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/predicate_traits.h>
 #include <__utility/forward.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -23,7 +25,7 @@
 
 // Arithmetic operations
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -38,7 +40,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(plus);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS plus<void>
 {
@@ -52,7 +54,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -67,7 +69,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(minus);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS minus<void>
 {
@@ -81,7 +83,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -96,7 +98,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(multiplies);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS multiplies<void>
 {
@@ -110,7 +112,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -125,7 +127,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(divides);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS divides<void>
 {
@@ -139,7 +141,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -154,7 +156,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(modulus);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS modulus<void>
 {
@@ -168,7 +170,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -183,7 +185,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(negate);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS negate<void>
 {
@@ -199,7 +201,7 @@
 
 // Bitwise operations
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -214,7 +216,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(bit_and);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS bit_and<void>
 {
@@ -228,7 +230,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 struct _LIBCPP_TEMPLATE_VIS bit_not
     : __unary_function<_Tp, _Tp>
@@ -252,7 +254,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -267,7 +269,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(bit_or);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS bit_or<void>
 {
@@ -281,7 +283,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -296,7 +298,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(bit_xor);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS bit_xor<void>
 {
@@ -312,7 +314,7 @@
 
 // Comparison operations
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -327,7 +329,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(equal_to);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS equal_to<void>
 {
@@ -341,7 +343,15 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+template <class _Tp>
+struct __is_trivial_equality_predicate<equal_to<_Tp>, _Tp, _Tp> : true_type {};
+
+#if _LIBCPP_STD_VER >= 14
+template <class _Tp>
+struct __is_trivial_equality_predicate<equal_to<>, _Tp, _Tp> : true_type {};
+#endif
+
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -356,7 +366,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(not_equal_to);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS not_equal_to<void>
 {
@@ -370,7 +380,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -385,7 +395,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(less);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS less<void>
 {
@@ -399,7 +409,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -414,7 +424,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(less_equal);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS less_equal<void>
 {
@@ -428,7 +438,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -443,7 +453,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(greater_equal);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS greater_equal<void>
 {
@@ -457,7 +467,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -472,7 +482,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(greater);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS greater<void>
 {
@@ -488,7 +498,7 @@
 
 // Logical operations
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -503,7 +513,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(logical_and);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS logical_and<void>
 {
@@ -517,7 +527,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -532,7 +542,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(logical_not);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS logical_not<void>
 {
@@ -546,7 +556,7 @@
 };
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp = void>
 #else
 template <class _Tp>
@@ -561,7 +571,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(logical_or);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <>
 struct _LIBCPP_TEMPLATE_VIS logical_or<void>
 {
diff --git a/third_party/llvm-project/libcxx/include/__functional/perfect_forward.h b/third_party/llvm-project/libcxx/include/__functional/perfect_forward.h
index 9ffea1a..af89797 100644
--- a/third_party/llvm-project/libcxx/include/__functional/perfect_forward.h
+++ b/third_party/llvm-project/libcxx/include/__functional/perfect_forward.h
@@ -15,7 +15,6 @@
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -23,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Op, class _Indices, class... _BoundArgs>
 struct __perfect_forward_impl;
@@ -87,7 +86,7 @@
 template <class _Op, class ..._Args>
 using __perfect_forward = __perfect_forward_impl<_Op, index_sequence_for<_Args...>, _Args...>;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/ranges_operations.h b/third_party/llvm-project/libcxx/include/__functional/ranges_operations.h
index 87081dd..77b6a6d 100644
--- a/third_party/llvm-project/libcxx/include/__functional/ranges_operations.h
+++ b/third_party/llvm-project/libcxx/include/__functional/ranges_operations.h
@@ -13,6 +13,8 @@
 #include <__concepts/equality_comparable.h>
 #include <__concepts/totally_ordered.h>
 #include <__config>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/predicate_traits.h>
 #include <__utility/forward.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -21,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -93,7 +95,10 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+template <class _Lhs, class _Rhs>
+struct __is_trivial_equality_predicate<ranges::equal_to, _Lhs, _Rhs> : true_type {};
+
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__functional/reference_wrapper.h b/third_party/llvm-project/libcxx/include/__functional/reference_wrapper.h
index c377b64..2d382a3 100644
--- a/third_party/llvm-project/libcxx/include/__functional/reference_wrapper.h
+++ b/third_party/llvm-project/libcxx/include/__functional/reference_wrapper.h
@@ -55,12 +55,18 @@
     template <class... _ArgTypes>
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
     typename __invoke_of<type&, _ArgTypes...>::type
-    operator() (_ArgTypes&&... __args) const {
+    operator() (_ArgTypes&&... __args) const
+#if _LIBCPP_STD_VER >= 17
+        // Since is_nothrow_invocable requires C++17 LWG3764 is not backported
+        // to earlier versions.
+        noexcept(is_nothrow_invocable_v<_Tp&, _ArgTypes...>)
+#endif
+    {
         return std::__invoke(get(), std::forward<_ArgTypes>(__args)...);
     }
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__functional/unwrap_ref.h b/third_party/llvm-project/libcxx/include/__functional/unwrap_ref.h
index da000d8..3abad73 100644
--- a/third_party/llvm-project/libcxx/include/__functional/unwrap_ref.h
+++ b/third_party/llvm-project/libcxx/include/__functional/unwrap_ref.h
@@ -30,7 +30,7 @@
 template <class _Tp>
 struct decay;
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp>
 struct unwrap_reference : __unwrap_reference<_Tp> { };
 
@@ -38,7 +38,7 @@
 using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
 
 template <class _Tp>
-struct unwrap_ref_decay : unwrap_reference<typename decay<_Tp>::type> { };
+struct unwrap_ref_decay : unwrap_reference<__decay_t<_Tp> > { };
 
 template <class _Tp>
 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
@@ -46,10 +46,10 @@
 
 template <class _Tp>
 struct __unwrap_ref_decay
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     : unwrap_ref_decay<_Tp>
 #else
-    : __unwrap_reference<typename decay<_Tp>::type>
+    : __unwrap_reference<__decay_t<_Tp> >
 #endif
 { };
 
diff --git a/third_party/llvm-project/libcxx/include/__fwd/get.h b/third_party/llvm-project/libcxx/include/__fwd/get.h
index ec1fab4..d043414 100644
--- a/third_party/llvm-project/libcxx/include/__fwd/get.h
+++ b/third_party/llvm-project/libcxx/include/__fwd/get.h
@@ -15,7 +15,7 @@
 #include <__fwd/pair.h>
 #include <__fwd/subrange.h>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/tuple_element.h>
+#include <__tuple/tuple_element.h>
 #include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/third_party/llvm-project/libcxx/include/__fwd/span.h b/third_party/llvm-project/libcxx/include/__fwd/span.h
index 943cb13..e9fa703 100644
--- a/third_party/llvm-project/libcxx/include/__fwd/span.h
+++ b/third_party/llvm-project/libcxx/include/__fwd/span.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
 template <typename _Tp, size_t _Extent = dynamic_extent> class span;
diff --git a/third_party/llvm-project/libcxx/include/__hash_table b/third_party/llvm-project/libcxx/include/__hash_table
index f8896c8..e38a442 100644
--- a/third_party/llvm-project/libcxx/include/__hash_table
+++ b/third_party/llvm-project/libcxx/include/__hash_table
@@ -17,6 +17,7 @@
 #include <__config>
 #include <__debug>
 #include <__functional/hash.h>
+#include <__functional/invoke.h>
 #include <__iterator/iterator_traits.h>
 #include <__memory/addressof.h>
 #include <__memory/allocator_traits.h>
@@ -25,6 +26,16 @@
 #include <__memory/swap_allocator.h>
 #include <__memory/unique_ptr.h>
 #include <__type_traits/can_extract_key.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_const.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_nothrow_constructible.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
@@ -32,7 +43,6 @@
 #include <cmath>
 #include <cstring>
 #include <initializer_list>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -826,7 +836,7 @@
     template <class> friend class __hash_map_node_destructor;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _NodeType, class _Alloc>
 struct __generic_container_node_destructor;
 
@@ -1121,7 +1131,7 @@
         return __emplace_unique_key_args(_NodeTypes::__get_key(__x), __x);
     }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     template <class _NodeHandle, class _InsertReturnType>
     _LIBCPP_INLINE_VISIBILITY
     _InsertReturnType __node_handle_insert_unique(_NodeHandle&& __nh);
@@ -1597,10 +1607,10 @@
         if (bucket_count() != 0)
         {
             __next_pointer __cache = __detach();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             try
             {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
                 const_iterator __i = __u.begin();
                 while (__cache != nullptr && __u.size() != 0)
                 {
@@ -1610,14 +1620,14 @@
                     __node_insert_multi(__cache->__upcast());
                     __cache = __next;
                 }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             }
             catch (...)
             {
                 __deallocate_node(__cache);
                 throw;
             }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __deallocate_node(__cache);
         }
         const_iterator __i = __u.begin();
@@ -1659,10 +1669,10 @@
     if (bucket_count() != 0)
     {
         __next_pointer __cache = __detach();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (; __cache != nullptr && __first != __last; ++__first)
             {
                 __cache->__upcast()->__value_ = *__first;
@@ -1670,14 +1680,14 @@
                 __node_insert_unique(__cache->__upcast());
                 __cache = __next;
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __deallocate_node(__cache);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __deallocate_node(__cache);
     }
     for (; __first != __last; ++__first)
@@ -1699,10 +1709,10 @@
     if (bucket_count() != 0)
     {
         __next_pointer __cache = __detach();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (; __cache != nullptr && __first != __last; ++__first)
             {
                 __cache->__upcast()->__value_ = *__first;
@@ -1710,14 +1720,14 @@
                 __node_insert_multi(__cache->__upcast());
                 __cache = __next;
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __deallocate_node(__cache);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __deallocate_node(__cache);
     }
     for (; __first != __last; ++__first)
@@ -2088,7 +2098,7 @@
     return __r;
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Hash, class _Equal, class _Alloc>
 template <class _NodeHandle, class _InsertReturnType>
 _LIBCPP_INLINE_VISIBILITY
@@ -2218,7 +2228,7 @@
         __node_insert_multi_perform(__src_ptr, __pn);
     }
 }
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 template <class _Tp, class _Hash, class _Equal, class _Alloc>
 template <bool _UniqueKeys>
diff --git a/third_party/llvm-project/libcxx/include/__iterator/access.h b/third_party/llvm-project/libcxx/include/__iterator/access.h
index 0b8d523..d7bcb33 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/access.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/access.h
@@ -69,7 +69,7 @@
     return __c.end();
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template <class _Cp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
diff --git a/third_party/llvm-project/libcxx/include/__iterator/advance.h b/third_party/llvm-project/libcxx/include/__iterator/advance.h
index 154c273..4e852bb 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/advance.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/advance.h
@@ -23,7 +23,6 @@
 #include <__utility/declval.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
-#include <cstdlib>
 #include <limits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -69,7 +68,7 @@
   _VSTD::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.iter.op.advance]
 
@@ -159,9 +158,9 @@
                __a > 0  ? __a >= __b :
                           __a <= __b;
       };
-      if (const auto __M = __bound_sentinel - __i; __magnitude_geq(__n, __M)) {
+      if (const auto __m = __bound_sentinel - __i; __magnitude_geq(__n, __m)) {
         (*this)(__i, __bound_sentinel);
-        return __n - __M;
+        return __n - __m;
       }
 
       // Otherwise, equivalent to `ranges::advance(i, n)`.
@@ -196,7 +195,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/back_insert_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/back_insert_iterator.h
index 4c00a7e..dc656e3 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/back_insert_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/back_insert_iterator.h
@@ -36,7 +36,7 @@
 public:
     typedef output_iterator_tag iterator_category;
     typedef void value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t difference_type;
 #else
     typedef void difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__iterator/bounded_iter.h b/third_party/llvm-project/libcxx/include/__iterator/bounded_iter.h
index 2682f2a..00231e0 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/bounded_iter.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/bounded_iter.h
@@ -42,7 +42,7 @@
   using pointer           = typename iterator_traits<_Iterator>::pointer;
   using reference         = typename iterator_traits<_Iterator>::reference;
   using iterator_category = typename iterator_traits<_Iterator>::iterator_category;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   using iterator_concept = contiguous_iterator_tag;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/common_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/common_iterator.h
index f7883e2..aab04ce 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/common_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/common_iterator.h
@@ -25,6 +25,7 @@
 #include <__iterator/iter_swap.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/readable_traits.h>
+#include <__memory/addressof.h>
 #include <__type_traits/is_pointer.h>
 #include <__utility/declval.h>
 #include <variant>
@@ -35,7 +36,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class _Iter>
 concept __can_use_postfix_proxy =
@@ -274,7 +275,7 @@
   using reference = iter_reference_t<_Iter>;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/concepts.h b/third_party/llvm-project/libcxx/include/__iterator/concepts.h
index d9d40a4..dd9e8d6 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/concepts.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/concepts.h
@@ -46,7 +46,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [iterator.concept.readable]
 template<class _In>
@@ -293,7 +293,7 @@
 // Note: indirectly_swappable is located in iter_swap.h to prevent a dependency cycle
 // (both iter_swap and indirectly_swappable require indirectly_readable).
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/counted_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/counted_iterator.h
index 5fdbff4..ad69a5c 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/counted_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/counted_iterator.h
@@ -36,7 +36,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class>
 struct __counted_iterator_concept {};
@@ -143,12 +143,12 @@
   decltype(auto) operator++(int) {
     _LIBCPP_ASSERT(__count_ > 0, "Iterator already at or past end.");
     --__count_;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try { return __current_++; }
     catch(...) { ++__count_; throw; }
 #else
     return __current_++;
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
   }
 
   _LIBCPP_HIDE_FROM_ABI
@@ -303,7 +303,7 @@
                                 add_pointer_t<iter_reference_t<_Iter>>, void>;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/data.h b/third_party/llvm-project/libcxx/include/__iterator/data.h
index 88eb752..f106807 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/data.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/data.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Cont> constexpr
 _LIBCPP_INLINE_VISIBILITY
diff --git a/third_party/llvm-project/libcxx/include/__iterator/default_sentinel.h b/third_party/llvm-project/libcxx/include/__iterator/default_sentinel.h
index 669032a..d5fb2b6 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/default_sentinel.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/default_sentinel.h
@@ -18,12 +18,12 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 struct default_sentinel_t { };
 inline constexpr default_sentinel_t default_sentinel{};
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/distance.h b/third_party/llvm-project/libcxx/include/__iterator/distance.h
index 681e20d..ebe5473 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/distance.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/distance.h
@@ -53,7 +53,7 @@
     return _VSTD::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.iter.op.distance]
 
@@ -101,7 +101,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/empty.h b/third_party/llvm-project/libcxx/include/__iterator/empty.h
index 748ca9e..2cd4c7a 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/empty.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/empty.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Cont>
 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
@@ -37,7 +37,7 @@
 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
 constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/front_insert_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/front_insert_iterator.h
index e278359..1ad5348 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/front_insert_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/front_insert_iterator.h
@@ -36,7 +36,7 @@
 public:
     typedef output_iterator_tag iterator_category;
     typedef void value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t difference_type;
 #else
     typedef void difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__iterator/incrementable_traits.h b/third_party/llvm-project/libcxx/include/__iterator/incrementable_traits.h
index 3d06dc0..604e958 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/incrementable_traits.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/incrementable_traits.h
@@ -26,7 +26,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [incrementable.traits]
 template<class> struct incrementable_traits {};
@@ -71,7 +71,7 @@
                                                  incrementable_traits<remove_cvref_t<_Ip> >,
                                                  iterator_traits<remove_cvref_t<_Ip> > >::difference_type;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/indirectly_comparable.h b/third_party/llvm-project/libcxx/include/__iterator/indirectly_comparable.h
index 868190f..e60ba25 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/indirectly_comparable.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/indirectly_comparable.h
@@ -21,13 +21,13 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _I1, class _I2, class _Rp, class _P1 = identity, class _P2 = identity>
 concept indirectly_comparable =
   indirect_binary_predicate<_Rp, projected<_I1, _P1>, projected<_I2, _P2>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/insert_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/insert_iterator.h
index ecaea61..5534854 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/insert_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/insert_iterator.h
@@ -24,7 +24,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Container>
 using __insert_iterator_iter_t = ranges::iterator_t<_Container>;
 #else
@@ -46,7 +46,7 @@
 public:
     typedef output_iterator_tag iterator_category;
     typedef void value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t difference_type;
 #else
     typedef void difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__iterator/istream_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/istream_iterator.h
index a056961..989902f 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/istream_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/istream_iterator.h
@@ -47,9 +47,9 @@
     _Tp __value_;
 public:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s))
         {
             if (!(*__in_stream_ >> __value_))
@@ -73,11 +73,11 @@
     operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
                const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {
       return __i.__in_stream_ == nullptr;
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 };
 
 template <class _Tp, class _CharT, class _Traits, class _Distance>
diff --git a/third_party/llvm-project/libcxx/include/__iterator/istreambuf_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/istreambuf_iterator.h
index bc53a6a..e39fec6 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/istreambuf_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/istreambuf_iterator.h
@@ -67,10 +67,10 @@
     }
 public:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY constexpr istreambuf_iterator(default_sentinel_t) noexcept
         : istreambuf_iterator() {}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
         : __sbuf_(__s.rdbuf()) {}
     _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
@@ -93,11 +93,11 @@
     _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
         {return __test_for_eof() == __b.__test_for_eof();}
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) {
       return __i.__test_for_eof();
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 };
 
 template <class _CharT, class _Traits>
diff --git a/third_party/llvm-project/libcxx/include/__iterator/iter_move.h b/third_party/llvm-project/libcxx/include/__iterator/iter_move.h
index a7d9413..78b1448 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/iter_move.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/iter_move.h
@@ -25,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [iterator.cust.move]
 
@@ -97,7 +97,7 @@
   requires requires(_Tp& __t) { { ranges::iter_move(__t) } -> __can_reference; }
 using iter_rvalue_reference_t = decltype(ranges::iter_move(std::declval<_Tp&>()));
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/iter_swap.h b/third_party/llvm-project/libcxx/include/__iterator/iter_swap.h
index d4c0dca..c78efaf 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/iter_swap.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/iter_swap.h
@@ -28,7 +28,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [iter.cust.swap]
 
@@ -106,7 +106,7 @@
     ranges::iter_swap(__i2, __i1);
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/iterator_traits.h b/third_party/llvm-project/libcxx/include/__iterator/iterator_traits.h
index c9d8944..0318e4b 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/iterator_traits.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/iterator_traits.h
@@ -43,7 +43,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Tp>
 using __with_reference = _Tp&;
@@ -62,7 +62,7 @@
 template<__dereferenceable _Tp>
 using iter_reference_t = decltype(*std::declval<_Tp&>());
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template <class _Iter>
 struct _LIBCPP_TEMPLATE_VIS iterator_traits;
@@ -72,7 +72,7 @@
 struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag       : public input_iterator_tag {};
 struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {};
 struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {};
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 struct _LIBCPP_TEMPLATE_VIS contiguous_iterator_tag    : public random_access_iterator_tag {};
 #endif
 
@@ -157,7 +157,7 @@
     static const bool value = decltype(__test<_Tp>(nullptr))::value;
 };
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // The `cpp17-*-iterator` exposition-only concepts have very similar names to the `Cpp17*Iterator` named requirements
 // from `[iterator.cpp17]`. To avoid confusion between the two, the exposition-only concepts have been banished to
@@ -190,7 +190,7 @@
 concept __cpp17_forward_iterator =
   __cpp17_input_iterator<_Ip> &&
   constructible_from<_Ip> &&
-  is_lvalue_reference_v<iter_reference_t<_Ip>> &&
+  is_reference_v<iter_reference_t<_Ip>> &&
   same_as<remove_cvref_t<iter_reference_t<_Ip>>,
           typename indirectly_readable_traits<_Ip>::value_type> &&
   requires(_Ip __i) {
@@ -381,7 +381,7 @@
   using __primary_template = iterator_traits;
 };
 
-#else // _LIBCPP_STD_VER > 17
+#else // _LIBCPP_STD_VER >= 20
 
 template <class _Iter, bool> struct __iterator_traits {};
 
@@ -418,10 +418,10 @@
 
   using __primary_template = iterator_traits;
 };
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template<class _Tp>
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 requires is_object_v<_Tp>
 #endif
 struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*>
@@ -431,7 +431,7 @@
     typedef _Tp* pointer;
     typedef _Tp& reference;
     typedef random_access_iterator_tag iterator_category;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef contiguous_iterator_tag    iterator_concept;
 #endif
 };
@@ -471,7 +471,7 @@
 // Such iterators receive special "contiguous" optimizations in
 // std::copy and std::sort.
 //
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp>
 struct __is_cpp17_contiguous_iterator : _Or<
     __has_iterator_category_convertible_to<_Tp, contiguous_iterator_tag>,
diff --git a/third_party/llvm-project/libcxx/include/__iterator/mergeable.h b/third_party/llvm-project/libcxx/include/__iterator/mergeable.h
index b9f2d08..494fda9 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/mergeable.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/mergeable.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Input1, class _Input2, class _Output,
           class _Comp = ranges::less, class _Proj1 = identity, class _Proj2 = identity>
@@ -34,7 +34,7 @@
     indirectly_copyable<_Input2, _Output> &&
     indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/move_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/move_iterator.h
index fa806db..e3939cc 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/move_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/move_iterator.h
@@ -41,7 +41,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<class _Iter, class = void>
 struct __move_iter_category_base {};
 
@@ -59,18 +59,33 @@
 concept __move_iter_comparable = requires {
     { std::declval<const _Iter&>() == std::declval<_Sent>() } -> convertible_to<bool>;
 };
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template <class _Iter>
 class _LIBCPP_TEMPLATE_VIS move_iterator
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     : public __move_iter_category_base<_Iter>
 #endif
 {
+    #if _LIBCPP_STD_VER >= 20
+private:
+    _LIBCPP_HIDE_FROM_ABI
+    static constexpr auto __get_iter_concept() {
+        if constexpr (random_access_iterator<_Iter>) {
+            return random_access_iterator_tag{};
+        } else if constexpr (bidirectional_iterator<_Iter>) {
+            return bidirectional_iterator_tag{};
+        } else if constexpr (forward_iterator<_Iter>) {
+            return forward_iterator_tag{};
+        } else {
+            return input_iterator_tag{};
+        }
+    }
+#endif // _LIBCPP_STD_VER >= 20
 public:
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using iterator_type = _Iter;
-    using iterator_concept = input_iterator_tag;
+    using iterator_concept = decltype(__get_iter_concept());
     // iterator_category is inherited and not always present
     using value_type = iter_value_t<_Iter>;
     using difference_type = iter_difference_t<_Iter>;
@@ -93,7 +108,7 @@
             __libcpp_remove_reference_t<__reference>&&,
             __reference
         >::type reference;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
     explicit move_iterator(_Iter __i) : __current_(std::move(__i)) {}
@@ -104,7 +119,7 @@
     _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
     pointer operator->() const { return __current_; }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_HIDE_FROM_ABI constexpr
     move_iterator() requires is_constructible_v<_Iter> : __current_() {}
 
@@ -171,7 +186,7 @@
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
     move_iterator operator++(int) { move_iterator __tmp(*this); ++__current_; return __tmp; }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
     move_iterator& operator--() { --__current_; return *this; }
@@ -186,7 +201,7 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
     move_iterator& operator-=(difference_type __n) { __current_ -= __n; return *this; }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template<sentinel_for<_Iter> _Sent>
     friend _LIBCPP_HIDE_FROM_ABI constexpr
     bool operator==(const move_iterator& __x, const move_sentinel<_Sent>& __y)
@@ -223,7 +238,7 @@
     {
         return ranges::iter_swap(__x.__current_, __y.__current_);
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 private:
     template<class _It2> friend class move_iterator;
@@ -276,7 +291,7 @@
     return __x.base() >= __y.base();
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Iter1, three_way_comparable_with<_Iter1> _Iter2>
 inline _LIBCPP_HIDE_FROM_ABI constexpr
 auto operator<=>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
@@ -284,7 +299,7 @@
 {
     return __x.base() <=> __y.base();
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
@@ -304,7 +319,7 @@
 }
 #endif // !_LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Iter>
 inline _LIBCPP_HIDE_FROM_ABI constexpr
 move_iterator<_Iter> operator+(iter_difference_t<_Iter> __n, const move_iterator<_Iter>& __x)
@@ -320,7 +335,7 @@
 {
     return move_iterator<_Iter>(__x.base() + __n);
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template <class _Iter>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
diff --git a/third_party/llvm-project/libcxx/include/__iterator/move_sentinel.h b/third_party/llvm-project/libcxx/include/__iterator/move_sentinel.h
index 0d7336a..5f16474 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/move_sentinel.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/move_sentinel.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <semiregular _Sent>
 class _LIBCPP_TEMPLATE_VIS move_sentinel
@@ -52,7 +52,7 @@
 
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(move_sentinel);
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/next.h b/third_party/llvm-project/libcxx/include/__iterator/next.h
index 49970ae..2eb2c1f 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/next.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/next.h
@@ -35,7 +35,7 @@
   return __x;
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.iter.op.next]
 
@@ -77,7 +77,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/ostream_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/ostream_iterator.h
index d16f5a2..025712b 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/ostream_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/ostream_iterator.h
@@ -34,7 +34,7 @@
 public:
     typedef output_iterator_tag             iterator_category;
     typedef void                            value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t                       difference_type;
 #else
     typedef void                            difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__iterator/ostreambuf_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/ostreambuf_iterator.h
index b75f7b6..898ef90 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/ostreambuf_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/ostreambuf_iterator.h
@@ -33,7 +33,7 @@
 public:
     typedef output_iterator_tag                 iterator_category;
     typedef void                                value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t                           difference_type;
 #else
     typedef void                                difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__iterator/permutable.h b/third_party/llvm-project/libcxx/include/__iterator/permutable.h
index 28d193e..adf88f5 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/permutable.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/permutable.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Iterator>
 concept permutable =
@@ -28,7 +28,7 @@
     indirectly_movable_storable<_Iterator, _Iterator> &&
     indirectly_swappable<_Iterator, _Iterator>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/prev.h b/third_party/llvm-project/libcxx/include/__iterator/prev.h
index af1e1ba..8e9c4f2 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/prev.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/prev.h
@@ -34,7 +34,7 @@
   return __x;
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.iter.op.prev]
 
@@ -70,7 +70,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/projected.h b/third_party/llvm-project/libcxx/include/__iterator/projected.h
index 19c076b..e74e56d 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/projected.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/projected.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj>
 struct projected {
@@ -34,7 +34,7 @@
   using difference_type = iter_difference_t<_It>;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/readable_traits.h b/third_party/llvm-project/libcxx/include/__iterator/readable_traits.h
index 8f17757..fe4f0cd 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/readable_traits.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/readable_traits.h
@@ -26,7 +26,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [readable.traits]
 template<class> struct __cond_value_type {};
@@ -85,7 +85,7 @@
                                             indirectly_readable_traits<remove_cvref_t<_Ip> >,
                                             iterator_traits<remove_cvref_t<_Ip> > >::value_type;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/reverse_access.h b/third_party/llvm-project/libcxx/include/__iterator/reverse_access.h
index 79b599c..b8c5a07 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/reverse_access.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/reverse_access.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template <class _Tp, size_t _Np>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
@@ -93,7 +93,7 @@
     return _VSTD::rend(__c);
 }
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/reverse_iterator.h b/third_party/llvm-project/libcxx/include/__iterator/reverse_iterator.h
index f272e03..8437064 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/reverse_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/reverse_iterator.h
@@ -63,10 +63,10 @@
     _Iter __t_; // no longer used as of LWG #2360, not removed due to ABI break
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     static_assert(__is_cpp17_bidirectional_iterator<_Iter>::value || bidirectional_iterator<_Iter>,
         "reverse_iterator<It> requires It to be a bidirectional iterator.");
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 protected:
     _Iter current;
@@ -77,7 +77,7 @@
                                   random_access_iterator_tag,
                                   typename iterator_traits<_Iter>::iterator_category>;
     using pointer = typename iterator_traits<_Iter>::pointer;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using iterator_concept = _If<random_access_iterator<_Iter>, random_access_iterator_tag, bidirectional_iterator_tag>;
     using value_type = iter_value_t<_Iter>;
     using difference_type = iter_difference_t<_Iter>;
@@ -144,7 +144,7 @@
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
     reference operator*() const {_Iter __tmp = current; return *--__tmp;}
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     constexpr pointer operator->() const
       requires is_pointer_v<_Iter> || requires(const _Iter __i) { __i.operator->(); }
@@ -160,7 +160,7 @@
     pointer operator->() const {
       return std::addressof(operator*());
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
     reverse_iterator& operator++() {--current; return *this;}
@@ -181,7 +181,7 @@
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
     reference operator[](difference_type __n) const {return *(*this + __n);}
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_HIDE_FROM_ABI friend constexpr
     iter_rvalue_reference_t<_Iter> iter_move(const reverse_iterator& __i)
       noexcept(is_nothrow_copy_constructible_v<_Iter> &&
@@ -200,18 +200,18 @@
       auto __ytmp = __y.base();
       ranges::iter_swap(--__xtmp, --__ytmp);
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 };
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
       { __x.base() == __y.base() } -> convertible_to<bool>;
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() == __y.base();
 }
@@ -220,11 +220,11 @@
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
         { __x.base() > __y.base() } -> convertible_to<bool>;
       }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() > __y.base();
 }
@@ -233,11 +233,11 @@
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
       { __x.base() != __y.base() } -> convertible_to<bool>;
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() != __y.base();
 }
@@ -246,11 +246,11 @@
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
         { __x.base() < __y.base() } -> convertible_to<bool>;
       }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() < __y.base();
 }
@@ -259,11 +259,11 @@
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
         { __x.base() <= __y.base() } -> convertible_to<bool>;
       }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() <= __y.base();
 }
@@ -272,16 +272,16 @@
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 bool
 operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     requires requires {
         { __x.base() >= __y.base() } -> convertible_to<bool>;
       }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 {
     return __x.base() >= __y.base();
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Iter1, three_way_comparable_with<_Iter1> _Iter2>
 _LIBCPP_HIDE_FROM_ABI constexpr
 compare_three_way_result_t<_Iter1, _Iter2>
@@ -289,7 +289,7 @@
 {
     return __y.base() <=> __x.base();
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
@@ -318,13 +318,13 @@
     return reverse_iterator<_Iter>(__x.base() - __n);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Iter1, class _Iter2>
   requires (!sized_sentinel_for<_Iter1, _Iter2>)
 inline constexpr bool disable_sized_sentinel_for<reverse_iterator<_Iter1>, reverse_iterator<_Iter2>> = true;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Iter>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
 reverse_iterator<_Iter> make_reverse_iterator(_Iter __i)
@@ -498,7 +498,7 @@
   }
 };
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <ranges::bidirectional_range _Range>
 _LIBCPP_HIDE_FROM_ABI constexpr ranges::
     subrange<reverse_iterator<ranges::iterator_t<_Range>>, reverse_iterator<ranges::iterator_t<_Range>>>
@@ -512,7 +512,7 @@
 struct __unwrap_iter_impl<reverse_iterator<reverse_iterator<_Iter> >, __b>
     : __unwrap_reverse_iter_impl<reverse_iterator, reverse_iterator, _Iter> {};
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Iter, bool __b>
 struct __unwrap_iter_impl<reverse_iterator<__unconstrained_reverse_iterator<_Iter>>, __b>
@@ -526,7 +526,7 @@
 struct __unwrap_iter_impl<__unconstrained_reverse_iterator<__unconstrained_reverse_iterator<_Iter>>, __b>
     : __unwrap_reverse_iter_impl<__unconstrained_reverse_iterator, __unconstrained_reverse_iterator, _Iter> {};
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/size.h b/third_party/llvm-project/libcxx/include/__iterator/size.h
index 1452bd1..625eeb1 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/size.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/size.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Cont>
 _LIBCPP_INLINE_VISIBILITY
@@ -34,7 +34,7 @@
 _LIBCPP_INLINE_VISIBILITY
 constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Cont>
 _LIBCPP_INLINE_VISIBILITY
 constexpr auto ssize(const _Cont& __c)
@@ -52,7 +52,7 @@
 _LIBCPP_DIAGNOSTIC_POP
 #endif
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/sortable.h b/third_party/llvm-project/libcxx/include/__iterator/sortable.h
index bcf934f..d4d77d6 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/sortable.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/sortable.h
@@ -23,14 +23,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Iter, class _Comp = ranges::less, class _Proj = identity>
 concept sortable =
   permutable<_Iter> &&
   indirect_strict_weak_order<_Comp, projected<_Iter, _Proj>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/unreachable_sentinel.h b/third_party/llvm-project/libcxx/include/__iterator/unreachable_sentinel.h
index d77cc99..91fd0a5 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/unreachable_sentinel.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/unreachable_sentinel.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 struct unreachable_sentinel_t {
   template<weakly_incrementable _Iter>
@@ -31,7 +31,7 @@
 
 inline constexpr unreachable_sentinel_t unreachable_sentinel{};
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__iterator/wrap_iter.h b/third_party/llvm-project/libcxx/include/__iterator/wrap_iter.h
index 16defc1..d0246ad 100644
--- a/third_party/llvm-project/libcxx/include/__iterator/wrap_iter.h
+++ b/third_party/llvm-project/libcxx/include/__iterator/wrap_iter.h
@@ -34,7 +34,7 @@
     typedef typename iterator_traits<iterator_type>::pointer           pointer;
     typedef typename iterator_traits<iterator_type>::reference         reference;
     typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef contiguous_iterator_tag                                    iterator_concept;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__locale b/third_party/llvm-project/libcxx/include/__locale
index e0ffa0c..b461831 100644
--- a/third_party/llvm-project/libcxx/include/__locale
+++ b/third_party/llvm-project/libcxx/include/__locale
@@ -14,6 +14,7 @@
 #include <__config>
 #include <cctype>
 #include <cstdint>
+#include <cstdlib>
 #include <locale.h>
 #include <mutex>
 #include <string>
@@ -927,6 +928,11 @@
 }
 
 template <class _CharT>
+_LIBCPP_HIDE_FROM_ABI bool isblank(_CharT __c, const locale& __loc) {
+    return std::use_facet<ctype<_CharT> >(__loc).is(ctype_base::blank, __c);
+}
+
+template <class _CharT>
 inline _LIBCPP_INLINE_VISIBILITY
 _CharT
 toupper(_CharT __c, const locale& __loc)
diff --git a/third_party/llvm-project/libcxx/include/__memory/aligned_alloc.h b/third_party/llvm-project/libcxx/include/__memory/aligned_alloc.h
new file mode 100644
index 0000000..786963c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__memory/aligned_alloc.h
@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MEMORY_ALIGNED_ALLOC_H
+#define _LIBCPP___MEMORY_ALIGNED_ALLOC_H
+
+#include <__config>
+#include <cstddef>
+#include <cstdlib>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
+
+// Low-level helpers to call the aligned allocation and deallocation functions
+// on the target platform. This is used to implement libc++'s own memory
+// allocation routines -- if you need to allocate memory inside the library,
+// chances are that you want to use `__libcpp_allocate` instead.
+//
+// Returns the allocated memory, or `nullptr` on failure.
+inline _LIBCPP_HIDE_FROM_ABI
+void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) {
+#  if defined(_LIBCPP_MSVCRT_LIKE)
+    return ::_aligned_malloc(__size, __alignment);
+#  elif _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_C11_ALIGNED_ALLOC)
+    // aligned_alloc() requires that __size is a multiple of __alignment,
+    // but for C++ [new.delete.general], only states "if the value of an
+    // alignment argument passed to any of these functions is not a valid
+    // alignment value, the behavior is undefined".
+    // To handle calls such as ::operator new(1, std::align_val_t(128)), we
+    // round __size up to the next multiple of __alignment.
+    size_t __rounded_size = (__size + __alignment - 1) & ~(__alignment - 1);
+    // Rounding up could have wrapped around to zero, so we have to add another
+    // max() ternary to the actual call site to avoid succeeded in that case.
+    return ::aligned_alloc(__alignment, __size > __rounded_size ? __size : __rounded_size);
+#  else
+    void* __result = nullptr;
+    (void)::posix_memalign(&__result, __alignment, __size);
+    // If posix_memalign fails, __result is unmodified so we still return `nullptr`.
+    return __result;
+#  endif
+}
+
+inline _LIBCPP_HIDE_FROM_ABI
+void __libcpp_aligned_free(void* __ptr) {
+#if defined(_LIBCPP_MSVCRT_LIKE)
+  ::_aligned_free(__ptr);
+#else
+  ::free(__ptr);
+#endif
+}
+
+#endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___MEMORY_ALIGNED_ALLOC_H
diff --git a/third_party/llvm-project/libcxx/include/__memory/allocate_at_least.h b/third_party/llvm-project/libcxx/include/__memory/allocate_at_least.h
index ef205f8..8d8ad07 100644
--- a/third_party/llvm-project/libcxx/include/__memory/allocate_at_least.h
+++ b/third_party/llvm-project/libcxx/include/__memory/allocate_at_least.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _Pointer>
 struct allocation_result {
   _Pointer ptr;
@@ -55,7 +55,7 @@
   return {__alloc.allocate(__n), __n};
 }
 
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/allocator.h b/third_party/llvm-project/libcxx/include/__memory/allocator.h
index 54c9b78..244013c 100644
--- a/third_party/llvm-project/libcxx/include/__memory/allocator.h
+++ b/third_party/llvm-project/libcxx/include/__memory/allocator.h
@@ -11,6 +11,7 @@
 #define _LIBCPP___MEMORY_ALLOCATOR_H
 
 #include <__config>
+#include <__memory/addressof.h>
 #include <__memory/allocate_at_least.h>
 #include <__memory/allocator_traits.h>
 #include <__type_traits/is_constant_evaluated.h>
@@ -116,7 +117,7 @@
         }
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr
     allocation_result<_Tp*> allocate_at_least(size_t __n) {
         return {allocate(__n), __n};
@@ -205,7 +206,7 @@
         }
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr
     allocation_result<const _Tp*> allocate_at_least(size_t __n) {
         return {allocate(__n), __n};
diff --git a/third_party/llvm-project/libcxx/include/__memory/allocator_arg_t.h b/third_party/llvm-project/libcxx/include/__memory/allocator_arg_t.h
index 15f8c98..9e2d8c6 100644
--- a/third_party/llvm-project/libcxx/include/__memory/allocator_arg_t.h
+++ b/third_party/llvm-project/libcxx/include/__memory/allocator_arg_t.h
@@ -25,9 +25,9 @@
 
 struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; };
 
-#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
+#if defined(_LIBCPP_BUILDING_LIBRARY)
 extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg;
-#else
+#elif !defined(_LIBCPP_CXX03_LANG)
 /* inline */ constexpr allocator_arg_t allocator_arg = allocator_arg_t();
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/allocator_traits.h b/third_party/llvm-project/libcxx/include/__memory/allocator_traits.h
index 3a23b47..57f88a3 100644
--- a/third_party/llvm-project/libcxx/include/__memory/allocator_traits.h
+++ b/third_party/llvm-project/libcxx/include/__memory/allocator_traits.h
@@ -300,7 +300,7 @@
         __enable_if_t<!__has_construct<allocator_type, _Tp*, _Args...>::value> >
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
     static void construct(allocator_type&, _Tp* __p, _Args&&... __args) {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         _VSTD::construct_at(__p, _VSTD::forward<_Args>(__args)...);
 #else
         ::new ((void*)__p) _Tp(_VSTD::forward<_Args>(__args)...);
@@ -319,7 +319,7 @@
         __enable_if_t<!__has_destroy<allocator_type, _Tp*>::value> >
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
     static void destroy(allocator_type&, _Tp* __p) {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         _VSTD::destroy_at(__p);
 #else
         __p->~_Tp();
diff --git a/third_party/llvm-project/libcxx/include/__memory/assume_aligned.h b/third_party/llvm-project/libcxx/include/__memory/assume_aligned.h
index a1fd244..1f505f5 100644
--- a/third_party/llvm-project/libcxx/include/__memory/assume_aligned.h
+++ b/third_party/llvm-project/libcxx/include/__memory/assume_aligned.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <size_t _Np, class _Tp>
 [[nodiscard]]
@@ -39,7 +39,7 @@
   }
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/compressed_pair.h b/third_party/llvm-project/libcxx/include/__memory/compressed_pair.h
index 8093d7c..d5986da 100644
--- a/third_party/llvm-project/libcxx/include/__memory/compressed_pair.h
+++ b/third_party/llvm-project/libcxx/include/__memory/compressed_pair.h
@@ -13,7 +13,7 @@
 #include <__config>
 #include <__fwd/get.h>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/tuple_indices.h>
+#include <__tuple/tuple_indices.h>
 #include <__type_traits/decay.h>
 #include <__type_traits/dependent_type.h>
 #include <__type_traits/enable_if.h>
@@ -46,7 +46,7 @@
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __compressed_pair_elem(__default_init_tag) {}
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __compressed_pair_elem(__value_init_tag) : __value_() {}
 
-  template <class _Up, class = __enable_if_t<!is_same<__compressed_pair_elem, typename decay<_Up>::type>::value> >
+  template <class _Up, class = __enable_if_t<!is_same<__compressed_pair_elem, __decay_t<_Up> >::value> >
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
   explicit __compressed_pair_elem(_Up&& __u) : __value_(std::forward<_Up>(__u)) {}
 
@@ -75,7 +75,7 @@
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __compressed_pair_elem(__default_init_tag) {}
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __compressed_pair_elem(__value_init_tag) : __value_type() {}
 
-  template <class _Up, class = __enable_if_t<!is_same<__compressed_pair_elem, typename decay<_Up>::type>::value> >
+  template <class _Up, class = __enable_if_t<!is_same<__compressed_pair_elem, __decay_t<_Up> >::value> >
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
   explicit __compressed_pair_elem(_Up&& __u) : __value_type(std::forward<_Up>(__u)) {}
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/concepts.h b/third_party/llvm-project/libcxx/include/__memory/concepts.h
index 12d7bf8..9517a8f 100644
--- a/third_party/llvm-project/libcxx/include/__memory/concepts.h
+++ b/third_party/llvm-project/libcxx/include/__memory/concepts.h
@@ -26,7 +26,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -62,7 +62,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/construct_at.h b/third_party/llvm-project/libcxx/include/__memory/construct_at.h
index ffee002..fb146b7 100644
--- a/third_party/llvm-project/libcxx/include/__memory/construct_at.h
+++ b/third_party/llvm-project/libcxx/include/__memory/construct_at.h
@@ -30,19 +30,19 @@
 
 // construct_at
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
 _LIBCPP_HIDE_FROM_ABI constexpr _Tp* construct_at(_Tp* __location, _Args&&... __args) {
   _LIBCPP_ASSERT(__location != nullptr, "null pointer given to construct_at");
-  return ::new (_VSTD::__voidify(*__location)) _Tp(_VSTD::forward<_Args>(__args)...);
+  return ::new (std::__voidify(*__location)) _Tp(std::forward<_Args>(__args)...);
 }
 
 #endif
 
 template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* __construct_at(_Tp* __location, _Args&&... __args) {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   return std::construct_at(__location, std::forward<_Args>(__args)...);
 #else
   return _LIBCPP_ASSERT(__location != nullptr, "null pointer given to construct_at"),
@@ -66,12 +66,12 @@
     __loc->~_Tp();
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, typename enable_if<is_array<_Tp>::value, int>::type = 0>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 void __destroy_at(_Tp* __loc) {
     _LIBCPP_ASSERT(__loc != nullptr, "null pointer given to destroy_at");
-    _VSTD::__destroy(_VSTD::begin(*__loc), _VSTD::end(*__loc));
+    std::__destroy(std::begin(*__loc), std::end(*__loc));
 }
 #endif
 
@@ -79,41 +79,51 @@
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 _ForwardIterator __destroy(_ForwardIterator __first, _ForwardIterator __last) {
     for (; __first != __last; ++__first)
-        _VSTD::__destroy_at(_VSTD::addressof(*__first));
+        std::__destroy_at(std::addressof(*__first));
     return __first;
 }
 
-#if _LIBCPP_STD_VER > 14
+template <class _BidirectionalIterator>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+_BidirectionalIterator __reverse_destroy(_BidirectionalIterator __first, _BidirectionalIterator __last) {
+    while (__last != __first) {
+        --__last;
+        std::__destroy_at(std::addressof(*__last));
+    }
+    return __last;
+}
+
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Tp, enable_if_t<!is_array_v<_Tp>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 void destroy_at(_Tp* __loc) {
-    _VSTD::__destroy_at(__loc);
+    std::__destroy_at(__loc);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, enable_if_t<is_array_v<_Tp>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 void destroy_at(_Tp* __loc) {
-  _VSTD::__destroy_at(__loc);
+  std::__destroy_at(__loc);
 }
 #endif
 
 template <class _ForwardIterator>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 void destroy(_ForwardIterator __first, _ForwardIterator __last) {
-  (void)_VSTD::__destroy(_VSTD::move(__first), _VSTD::move(__last));
+  (void)std::__destroy(std::move(__first), std::move(__last));
 }
 
 template <class _ForwardIterator, class _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 _ForwardIterator destroy_n(_ForwardIterator __first, _Size __n) {
     for (; __n > 0; (void)++__first, --__n)
-        _VSTD::__destroy_at(_VSTD::addressof(*__first));
+        std::__destroy_at(std::addressof(*__first));
     return __first;
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/pointer_traits.h b/third_party/llvm-project/libcxx/include/__memory/pointer_traits.h
index c4f20de..c33e7bd 100644
--- a/third_party/llvm-project/libcxx/include/__memory/pointer_traits.h
+++ b/third_party/llvm-project/libcxx/include/__memory/pointer_traits.h
@@ -200,7 +200,7 @@
     _And<is_class<_Pointer>, _IsFancyPointer<_Pointer> >::value
 > >
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-typename decay<decltype(__to_address_helper<_Pointer>::__call(std::declval<const _Pointer&>()))>::type
+__decay_t<decltype(__to_address_helper<_Pointer>::__call(std::declval<const _Pointer&>()))>
 __to_address(const _Pointer& __p) _NOEXCEPT {
     return __to_address_helper<_Pointer>::__call(__p);
 }
@@ -223,7 +223,7 @@
     }
 };
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY constexpr
 auto to_address(_Tp *__p) noexcept {
diff --git a/third_party/llvm-project/libcxx/include/__memory/ranges_construct_at.h b/third_party/llvm-project/libcxx/include/__memory/ranges_construct_at.h
index e63585d..9ded2fc 100644
--- a/third_party/llvm-project/libcxx/include/__memory/ranges_construct_at.h
+++ b/third_party/llvm-project/libcxx/include/__memory/ranges_construct_at.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 namespace ranges {
 
 // construct_at
@@ -118,7 +118,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/ranges_uninitialized_algorithms.h b/third_party/llvm-project/libcxx/include/__memory/ranges_uninitialized_algorithms.h
index 15c78e2..bea5385 100644
--- a/third_party/llvm-project/libcxx/include/__memory/ranges_uninitialized_algorithms.h
+++ b/third_party/llvm-project/libcxx/include/__memory/ranges_uninitialized_algorithms.h
@@ -33,7 +33,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -312,7 +312,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/raw_storage_iterator.h b/third_party/llvm-project/libcxx/include/__memory/raw_storage_iterator.h
index 11971de..df7ef5a 100644
--- a/third_party/llvm-project/libcxx/include/__memory/raw_storage_iterator.h
+++ b/third_party/llvm-project/libcxx/include/__memory/raw_storage_iterator.h
@@ -39,7 +39,7 @@
 public:
     typedef output_iterator_tag iterator_category;
     typedef void                value_type;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef ptrdiff_t           difference_type;
 #else
     typedef void                difference_type;
diff --git a/third_party/llvm-project/libcxx/include/__memory/shared_ptr.h b/third_party/llvm-project/libcxx/include/__memory/shared_ptr.h
index b77ce92..1d72eb6 100644
--- a/third_party/llvm-project/libcxx/include/__memory/shared_ptr.h
+++ b/third_party/llvm-project/libcxx/include/__memory/shared_ptr.h
@@ -29,17 +29,32 @@
 #include <__memory/pointer_traits.h>
 #include <__memory/uninitialized_algorithms.h>
 #include <__memory/unique_ptr.h>
+#include <__type_traits/add_lvalue_reference.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/disjunction.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_bounded_array.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_move_constructible.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_unbounded_array.h>
+#include <__type_traits/nat.h>
+#include <__type_traits/negation.h>
+#include <__type_traits/remove_extent.h>
+#include <__type_traits/remove_reference.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
+#include <__verbose_abort>
 #include <cstddef>
-#include <cstdlib> // abort
 #include <iosfwd>
 #include <new>
 #include <stdexcept>
 #include <typeinfo>
 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
-#  include <atomic>
+#  include <__atomic/memory_order.h>
 #endif
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -118,10 +133,10 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_weak_ptr()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_weak_ptr();
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_weak_ptr was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -219,7 +234,7 @@
     __shared_ptr_pointer(_Tp __p, _Dp __d, _Alloc __a)
         :  __data_(__compressed_pair<_Tp, _Dp>(__p, _VSTD::move(__d)), _VSTD::move(__a)) {}
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     const void* __get_deleter(const type_info&) const _NOEXCEPT override;
 #endif
 
@@ -228,7 +243,7 @@
     void __on_zero_shared_weak() _NOEXCEPT override;
 };
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
 
 template <class _Tp, class _Dp, class _Alloc>
 const void*
@@ -237,7 +252,7 @@
     return __t == typeid(_Dp) ? _VSTD::addressof(__data_.first().second()) : nullptr;
 }
 
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 
 template <class _Tp, class _Dp, class _Alloc>
 void
@@ -260,7 +275,10 @@
     __a.deallocate(_PTraits::pointer_to(*this), 1);
 }
 
-struct __default_initialize_tag {};
+// This tag is used to instantiate an allocator type. The various shared_ptr control blocks
+// detect that the allocator has been instantiated for this type and perform alternative
+// initialization/destruction based on that.
+struct __for_overwrite_tag {};
 
 template <class _Tp, class _Alloc>
 struct __shared_ptr_emplace
@@ -271,25 +289,20 @@
     explicit __shared_ptr_emplace(_Alloc __a, _Args&& ...__args)
         : __storage_(_VSTD::move(__a))
     {
-#if _LIBCPP_STD_VER > 17
-        using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type;
-        _TpAlloc __tmp(*__get_alloc());
-        allocator_traits<_TpAlloc>::construct(__tmp, __get_elem(), _VSTD::forward<_Args>(__args)...);
+#if _LIBCPP_STD_VER >= 20
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            static_assert(sizeof...(_Args) == 0, "No argument should be provided to the control block when using _for_overwrite");
+            ::new ((void*)__get_elem()) _Tp;
+        } else {
+            using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type;
+            _TpAlloc __tmp(*__get_alloc());
+            allocator_traits<_TpAlloc>::construct(__tmp, __get_elem(), _VSTD::forward<_Args>(__args)...);
+        }
 #else
         ::new ((void*)__get_elem()) _Tp(_VSTD::forward<_Args>(__args)...);
 #endif
     }
 
-
-#if _LIBCPP_STD_VER >= 20
-    _LIBCPP_HIDE_FROM_ABI
-    explicit __shared_ptr_emplace(__default_initialize_tag, _Alloc __a)
-        : __storage_(std::move(__a))
-    {
-        ::new ((void*)__get_elem()) _Tp;
-    }
-#endif
-
     _LIBCPP_HIDE_FROM_ABI
     _Alloc* __get_alloc() _NOEXCEPT { return __storage_.__get_alloc(); }
 
@@ -298,10 +311,14 @@
 
 private:
     void __on_zero_shared() _NOEXCEPT override {
-#if _LIBCPP_STD_VER > 17
-        using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type;
-        _TpAlloc __tmp(*__get_alloc());
-        allocator_traits<_TpAlloc>::destroy(__tmp, __get_elem());
+#if _LIBCPP_STD_VER >= 20
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            __get_elem()->~_Tp();
+        } else {
+            using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type;
+            _TpAlloc __tmp(*__get_alloc());
+            allocator_traits<_TpAlloc>::destroy(__tmp, __get_elem());
+        }
 #else
         __get_elem()->~_Tp();
 #endif
@@ -367,13 +384,57 @@
 
 template<class _Tp> class _LIBCPP_TEMPLATE_VIS enable_shared_from_this;
 
-template<class _Tp, class _Up>
+// http://eel.is/c++draft/util.sharedptr#util.smartptr.shared.general-6
+// A pointer type Y* is said to be compatible with a pointer type T*
+// when either Y* is convertible to T* or Y is U[N] and T is cv U[].
+#if _LIBCPP_STD_VER >= 17
+template <class _Yp, class _Tp>
+struct __bounded_convertible_to_unbounded : false_type {};
+
+template <class _Up, std::size_t _Np, class _Tp>
+struct __bounded_convertible_to_unbounded<_Up[_Np], _Tp>
+        : is_same<__remove_cv_t<_Tp>, _Up[]> {};
+
+template <class _Yp, class _Tp>
 struct __compatible_with
-#if _LIBCPP_STD_VER > 14
-    : is_convertible<remove_extent_t<_Tp>*, remove_extent_t<_Up>*> {};
+    : _Or<
+        is_convertible<_Yp*, _Tp*>,
+        __bounded_convertible_to_unbounded<_Yp, _Tp>
+    > {};
 #else
-    : is_convertible<_Tp*, _Up*> {};
-#endif // _LIBCPP_STD_VER > 14
+template <class _Yp, class _Tp>
+struct __compatible_with
+    : is_convertible<_Yp*, _Tp*> {};
+#endif // _LIBCPP_STD_VER >= 17
+
+// Constructors that take raw pointers have a different set of "compatible" constraints
+// http://eel.is/c++draft/util.sharedptr#util.smartptr.shared.const-9.1
+// - If T is an array type, then either T is U[N] and Y(*)[N] is convertible to T*,
+//   or T is U[] and Y(*)[] is convertible to T*.
+// - If T is not an array type, then Y* is convertible to T*.
+#if _LIBCPP_STD_VER >= 17
+template <class _Yp, class _Tp, class = void>
+struct __raw_pointer_compatible_with : _And<
+        _Not<is_array<_Tp>>,
+        is_convertible<_Yp*, _Tp*>
+        > {};
+
+template <class _Yp, class _Up, std::size_t _Np>
+struct __raw_pointer_compatible_with<_Yp, _Up[_Np], __enable_if_t<
+            is_convertible<_Yp(*)[_Np], _Up(*)[_Np]>::value> >
+        : true_type {};
+
+template <class _Yp, class _Up>
+struct __raw_pointer_compatible_with<_Yp, _Up[], __enable_if_t<
+            is_convertible<_Yp(*)[], _Up(*)[]>::value> >
+        : true_type {};
+
+#else
+template <class _Yp, class _Tp>
+struct __raw_pointer_compatible_with
+    : is_convertible<_Yp*, _Tp*> {};
+#endif // _LIBCPP_STD_VER >= 17
+
 
 template <class _Ptr, class = void>
 struct __is_deletable : false_type { };
@@ -387,24 +448,24 @@
 
 template <class _Dp, class _Pt,
     class = decltype(std::declval<_Dp>()(std::declval<_Pt>()))>
-static true_type __well_formed_deleter_test(int);
+true_type __well_formed_deleter_test(int);
 
 template <class, class>
-static false_type __well_formed_deleter_test(...);
+false_type __well_formed_deleter_test(...);
 
 template <class _Dp, class _Pt>
 struct __well_formed_deleter : decltype(std::__well_formed_deleter_test<_Dp, _Pt>(0)) {};
 
-template<class _Dp, class _Tp, class _Yp>
+template<class _Dp, class _Yp, class _Tp>
 struct __shared_ptr_deleter_ctor_reqs
 {
-    static const bool value = __compatible_with<_Tp, _Yp>::value &&
+    static const bool value = __raw_pointer_compatible_with<_Yp, _Tp>::value &&
                               is_move_constructible<_Dp>::value &&
-                              __well_formed_deleter<_Dp, _Tp*>::value;
+                              __well_formed_deleter<_Dp, _Yp*>::value;
 };
 
 #if defined(_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI)
-#  define _LIBCPP_SHARED_PTR_TRIVIAL_ABI __attribute__((trivial_abi))
+#  define _LIBCPP_SHARED_PTR_TRIVIAL_ABI __attribute__((__trivial_abi__))
 #else
 #  define _LIBCPP_SHARED_PTR_TRIVIAL_ABI
 #endif
@@ -413,7 +474,7 @@
 class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS shared_ptr
 {
 public:
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef weak_ptr<_Tp> weak_type;
     typedef remove_extent_t<_Tp> element_type;
 #else
@@ -439,7 +500,7 @@
 
     template<class _Yp, class = __enable_if_t<
         _And<
-            __compatible_with<_Yp, _Tp>
+            __raw_pointer_compatible_with<_Yp, _Tp>
             // In C++03 we get errors when trying to do SFINAE with the
             // delete operator, so we always pretend that it's deletable.
             // The same happens on GCC.
@@ -457,15 +518,15 @@
         __enable_weak_this(__p, __p);
     }
 
-    template<class _Yp, class _Dp, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> >
+    template<class _Yp, class _Dp, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, _Tp>::value> >
     _LIBCPP_HIDE_FROM_ABI
     shared_ptr(_Yp* __p, _Dp __d)
         : __ptr_(__p)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT;
             typedef __shared_ptr_pointer<_Yp*, _Dp, _AllocT> _CntrlBlk;
 #ifndef _LIBCPP_CXX03_LANG
@@ -474,25 +535,25 @@
             __cntrl_ = new _CntrlBlk(__p, __d, _AllocT());
 #endif // not _LIBCPP_CXX03_LANG
             __enable_weak_this(__p, __p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __d(__p);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 
-    template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> >
+    template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, _Tp>::value> >
     _LIBCPP_HIDE_FROM_ABI
     shared_ptr(_Yp* __p, _Dp __d, _Alloc __a)
         : __ptr_(__p)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef __shared_ptr_pointer<_Yp*, _Dp, _Alloc> _CntrlBlk;
             typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2;
             typedef __allocator_destructor<_A2> _D2;
@@ -506,14 +567,14 @@
 #endif // not _LIBCPP_CXX03_LANG
             __cntrl_ = _VSTD::addressof(*__hold2.release());
             __enable_weak_this(__p, __p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __d(__p);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 
     template<class _Dp>
@@ -521,10 +582,10 @@
     shared_ptr(nullptr_t __p, _Dp __d)
         : __ptr_(nullptr)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef typename __shared_ptr_default_allocator<_Tp>::type _AllocT;
             typedef __shared_ptr_pointer<nullptr_t, _Dp, _AllocT> _CntrlBlk;
 #ifndef _LIBCPP_CXX03_LANG
@@ -532,14 +593,14 @@
 #else
             __cntrl_ = new _CntrlBlk(__p, __d, _AllocT());
 #endif // not _LIBCPP_CXX03_LANG
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __d(__p);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 
     template<class _Dp, class _Alloc>
@@ -547,10 +608,10 @@
     shared_ptr(nullptr_t __p, _Dp __d, _Alloc __a)
         : __ptr_(nullptr)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef __shared_ptr_pointer<nullptr_t, _Dp, _Alloc> _CntrlBlk;
             typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2;
             typedef __allocator_destructor<_A2> _D2;
@@ -563,14 +624,14 @@
                 _CntrlBlk(__p, __d, __a);
 #endif // not _LIBCPP_CXX03_LANG
             __cntrl_ = _VSTD::addressof(*__hold2.release());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __d(__p);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 
     template<class _Yp>
@@ -646,13 +707,14 @@
 
     template <class _Yp, class _Dp, class = __enable_if_t<
         !is_lvalue_reference<_Dp>::value &&
+         __compatible_with<_Yp, _Tp>::value &&
          is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
     > >
     _LIBCPP_HIDE_FROM_ABI
     shared_ptr(unique_ptr<_Yp, _Dp>&& __r)
         : __ptr_(__r.get())
     {
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
         if (__ptr_ == nullptr)
             __cntrl_ = nullptr;
         else
@@ -668,13 +730,14 @@
 
     template <class _Yp, class _Dp, class = void, class = __enable_if_t<
         is_lvalue_reference<_Dp>::value &&
+         __compatible_with<_Yp, _Tp>::value &&
         is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
     > >
     _LIBCPP_HIDE_FROM_ABI
     shared_ptr(unique_ptr<_Yp, _Dp>&& __r)
         : __ptr_(__r.get())
     {
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
         if (__ptr_ == nullptr)
             __cntrl_ = nullptr;
         else
@@ -740,9 +803,10 @@
     }
 #endif
 
-    template <class _Yp, class _Dp, class = __enable_if_t<
-        is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
-    > >
+    template <class _Yp, class _Dp, class = __enable_if_t<_And<
+        __compatible_with<_Yp, _Tp>,
+        is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>
+    >::value> >
     _LIBCPP_HIDE_FROM_ABI
     shared_ptr<_Tp>& operator=(unique_ptr<_Yp, _Dp>&& __r)
     {
@@ -764,7 +828,7 @@
     }
 
     template<class _Yp, class = __enable_if_t<
-        __compatible_with<_Yp, _Tp>::value
+        __raw_pointer_compatible_with<_Yp, _Tp>::value
     > >
     _LIBCPP_HIDE_FROM_ABI
     void reset(_Yp* __p)
@@ -773,8 +837,7 @@
     }
 
     template<class _Yp, class _Dp, class = __enable_if_t<
-        __compatible_with<_Yp, _Tp>::value
-    > >
+        __shared_ptr_deleter_ctor_reqs<_Dp, _Yp, _Tp>::value> >
     _LIBCPP_HIDE_FROM_ABI
     void reset(_Yp* __p, _Dp __d)
     {
@@ -782,8 +845,7 @@
     }
 
     template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t<
-        __compatible_with<_Yp, _Tp>::value
-    > >
+        __shared_ptr_deleter_ctor_reqs<_Dp, _Yp, _Tp>::value> >
     _LIBCPP_HIDE_FROM_ABI
     void reset(_Yp* __p, _Dp __d, _Alloc __a)
     {
@@ -848,7 +910,7 @@
         return __cntrl_ == __p.__cntrl_;
     }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_HIDE_FROM_ABI
     __add_lvalue_reference_t<element_type> operator[](ptrdiff_t __i) const
     {
@@ -858,7 +920,7 @@
     }
 #endif
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
     template <class _Dp>
     _LIBCPP_HIDE_FROM_ABI
     _Dp* __get_deleter() const _NOEXCEPT
@@ -867,7 +929,7 @@
                     ? const_cast<void *>(__cntrl_->__get_deleter(typeid(_Dp)))
                       : nullptr);
     }
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 
     template<class _Yp, class _CntrlBlk>
     _LIBCPP_HIDE_FROM_ABI
@@ -928,7 +990,7 @@
     template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Tp>
 shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>;
 template<class _Tp, class _Dp>
@@ -963,12 +1025,9 @@
 _LIBCPP_HIDE_FROM_ABI
 shared_ptr<_Tp> allocate_shared_for_overwrite(const _Alloc& __a)
 {
-    using _ControlBlock = __shared_ptr_emplace<_Tp, _Alloc>;
-    using _ControlBlockAllocator = typename __allocator_traits_rebind<_Alloc, _ControlBlock>::type;
-    __allocation_guard<_ControlBlockAllocator> __guard(__a, 1);
-    ::new ((void*)_VSTD::addressof(*__guard.__get())) _ControlBlock(__default_initialize_tag{}, __a);
-    auto __control_block = __guard.__release_ptr();
-    return shared_ptr<_Tp>::__create_with_control_block((*__control_block).__get_elem(), _VSTD::addressof(*__control_block));
+    using _ForOverwriteAllocator = __allocator_traits_rebind_t<_Alloc, __for_overwrite_tag>;
+    _ForOverwriteAllocator __alloc(__a);
+    return std::allocate_shared<_Tp>(__alloc);
 }
 
 template<class _Tp, __enable_if_t<!is_array<_Tp>::value, int> = 0>
@@ -980,7 +1039,7 @@
 
 #endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <size_t _Alignment>
 struct __sp_aligned_storage {
@@ -1000,26 +1059,25 @@
     explicit __unbounded_array_control_block(_Alloc const& __alloc, size_t __count, _Tp const& __arg)
         : __alloc_(__alloc), __count_(__count)
     {
-        std::__uninitialized_allocator_fill_n(__alloc_, std::begin(__data_), __count_, __arg);
+        std::__uninitialized_allocator_fill_n_multidimensional(__alloc_, std::begin(__data_), __count_, __arg);
     }
 
     _LIBCPP_HIDE_FROM_ABI
     explicit __unbounded_array_control_block(_Alloc const& __alloc, size_t __count)
         : __alloc_(__alloc), __count_(__count)
     {
-        std::__uninitialized_allocator_value_construct_n(__alloc_, std::begin(__data_), __count_);
-    }
-
 #if _LIBCPP_STD_VER >= 20
-    _LIBCPP_HIDE_FROM_ABI
-    explicit __unbounded_array_control_block(_Alloc const& __alloc, size_t __count, __default_initialize_tag)
-        : __alloc_(__alloc), __count_(__count)
-    {
-        // We are purposefully not using an allocator-aware default construction because the spec says so.
-        // There's currently no way of expressing default initialization in an allocator-aware manner anyway.
-        std::uninitialized_default_construct_n(std::begin(__data_), __count_);
-    }
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            // We are purposefully not using an allocator-aware default construction because the spec says so.
+            // There's currently no way of expressing default initialization in an allocator-aware manner anyway.
+            std::uninitialized_default_construct_n(std::begin(__data_), __count_);
+        } else {
+            std::__uninitialized_allocator_value_construct_n_multidimensional(__alloc_, std::begin(__data_), __count_);
+        }
+#else
+        std::__uninitialized_allocator_value_construct_n_multidimensional(__alloc_, std::begin(__data_), __count_);
 #endif
+    }
 
     // Returns the number of bytes required to store a control block followed by the given number
     // of elements of _Tp, with the whole storage being aligned to a multiple of _Tp's alignment.
@@ -1042,8 +1100,17 @@
 
 private:
     void __on_zero_shared() _NOEXCEPT override {
+#if _LIBCPP_STD_VER >= 20
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            std::__reverse_destroy(__data_, __data_ + __count_);
+        } else {
+            __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_);
+            std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + __count_);
+        }
+#else
         __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_);
         std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + __count_);
+#endif
     }
 
     void __on_zero_shared_weak() _NOEXCEPT override {
@@ -1096,30 +1163,40 @@
 
     _LIBCPP_HIDE_FROM_ABI
     explicit __bounded_array_control_block(_Alloc const& __alloc, _Tp const& __arg) : __alloc_(__alloc) {
-        std::__uninitialized_allocator_fill_n(__alloc_, std::addressof(__data_[0]), _Count, __arg);
+        std::__uninitialized_allocator_fill_n_multidimensional(__alloc_, std::addressof(__data_[0]), _Count, __arg);
     }
 
     _LIBCPP_HIDE_FROM_ABI
     explicit __bounded_array_control_block(_Alloc const& __alloc) : __alloc_(__alloc) {
-        std::__uninitialized_allocator_value_construct_n(__alloc_, std::addressof(__data_[0]), _Count);
-    }
-
 #if _LIBCPP_STD_VER >= 20
-    _LIBCPP_HIDE_FROM_ABI
-    explicit __bounded_array_control_block(_Alloc const& __alloc, __default_initialize_tag) : __alloc_(__alloc) {
-        // We are purposefully not using an allocator-aware default construction because the spec says so.
-        // There's currently no way of expressing default initialization in an allocator-aware manner anyway.
-        std::uninitialized_default_construct_n(std::addressof(__data_[0]), _Count);
-    }
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            // We are purposefully not using an allocator-aware default construction because the spec says so.
+            // There's currently no way of expressing default initialization in an allocator-aware manner anyway.
+            std::uninitialized_default_construct_n(std::addressof(__data_[0]), _Count);
+        } else {
+            std::__uninitialized_allocator_value_construct_n_multidimensional(__alloc_, std::addressof(__data_[0]), _Count);
+        }
+#else
+        std::__uninitialized_allocator_value_construct_n_multidimensional(__alloc_, std::addressof(__data_[0]), _Count);
 #endif
+    }
 
     _LIBCPP_HIDE_FROM_ABI_VIRTUAL
     ~__bounded_array_control_block() override { } // can't be `= default` because of the sometimes-non-trivial union member __data_
 
 private:
     void __on_zero_shared() _NOEXCEPT override {
+#if _LIBCPP_STD_VER >= 20
+        if constexpr (is_same_v<typename _Alloc::value_type, __for_overwrite_tag>) {
+            std::__reverse_destroy(__data_, __data_ + _Count);
+        } else {
+            __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_);
+            std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + _Count);
+        }
+#else
         __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_);
         std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + _Count);
+#endif
     }
 
     void __on_zero_shared_weak() _NOEXCEPT override {
@@ -1152,9 +1229,9 @@
     return shared_ptr<_Array>::__create_with_control_block(__control_block->__get_data(), __control_block);
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // bounded array variants
 template<class _Tp, class _Alloc, class = __enable_if_t<is_bounded_array<_Tp>::value>>
@@ -1175,7 +1252,9 @@
 _LIBCPP_HIDE_FROM_ABI
 shared_ptr<_Tp> allocate_shared_for_overwrite(const _Alloc& __a)
 {
-    return std::__allocate_shared_bounded_array<_Tp>(__a, __default_initialize_tag{});
+    using _ForOverwriteAllocator = __allocator_traits_rebind_t<_Alloc, __for_overwrite_tag>;
+    _ForOverwriteAllocator __alloc(__a);
+    return std::__allocate_shared_bounded_array<_Tp>(__alloc);
 }
 
 template<class _Tp, class = __enable_if_t<is_bounded_array<_Tp>::value>>
@@ -1196,7 +1275,7 @@
 _LIBCPP_HIDE_FROM_ABI
 shared_ptr<_Tp> make_shared_for_overwrite()
 {
-    return std::__allocate_shared_bounded_array<_Tp>(allocator<_Tp>(), __default_initialize_tag{});
+    return std::__allocate_shared_bounded_array<_Tp>(allocator<__for_overwrite_tag>());
 }
 
 // unbounded array variants
@@ -1218,7 +1297,9 @@
 _LIBCPP_HIDE_FROM_ABI
 shared_ptr<_Tp> allocate_shared_for_overwrite(const _Alloc& __a, size_t __n)
 {
-    return std::__allocate_shared_unbounded_array<_Tp>(__a, __n, __default_initialize_tag{});
+    using _ForOverwriteAllocator = __allocator_traits_rebind_t<_Alloc, __for_overwrite_tag>;
+    _ForOverwriteAllocator __alloc(__a);
+    return std::__allocate_shared_unbounded_array<_Tp>(__alloc, __n);
 }
 
 template<class _Tp, class = __enable_if_t<is_unbounded_array<_Tp>::value>>
@@ -1239,10 +1320,10 @@
 _LIBCPP_HIDE_FROM_ABI
 shared_ptr<_Tp> make_shared_for_overwrite(size_t __n)
 {
-    return std::__allocate_shared_unbounded_array<_Tp>(allocator<_Tp>(), __n, __default_initialize_tag{});
+    return std::__allocate_shared_unbounded_array<_Tp>(allocator<__for_overwrite_tag>(), __n);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template<class _Tp, class _Up>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1302,7 +1383,7 @@
 
 #endif // _LIBCPP_STD_VER <= 17
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<class _Tp, class _Up>
 _LIBCPP_HIDE_FROM_ABI strong_ordering
 operator<=>(shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) noexcept
@@ -1411,7 +1492,7 @@
 
 #endif // _LIBCPP_STD_VER <= 17
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<class _Tp>
 _LIBCPP_HIDE_FROM_ABI strong_ordering
 operator<=>(shared_ptr<_Tp> const& __x, nullptr_t) noexcept
@@ -1465,7 +1546,7 @@
                                typename shared_ptr<_Tp>::element_type*>(__r.get()));
 }
 
-#ifndef _LIBCPP_NO_RTTI
+#ifndef _LIBCPP_HAS_NO_RTTI
 
 template<class _Dp, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1475,13 +1556,13 @@
     return __p.template __get_deleter<_Dp>();
 }
 
-#endif // _LIBCPP_NO_RTTI
+#endif // _LIBCPP_HAS_NO_RTTI
 
 template<class _Tp>
 class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS weak_ptr
 {
 public:
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef remove_extent_t<_Tp> element_type;
 #else
     typedef _Tp element_type;
@@ -1566,7 +1647,7 @@
     template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Tp>
 weak_ptr(shared_ptr<_Tp>) -> weak_ptr<_Tp>;
 #endif
@@ -1742,7 +1823,7 @@
     return __r;
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp = void> struct owner_less;
 #else
 template <class _Tp> struct owner_less;
@@ -1779,7 +1860,7 @@
         {return __x.owner_before(__y);}
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <>
 struct _LIBCPP_TEMPLATE_VIS owner_less<void>
 {
@@ -1825,7 +1906,7 @@
     shared_ptr<_Tp const> shared_from_this() const
         {return shared_ptr<const _Tp>(__weak_this_);}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     weak_ptr<_Tp> weak_from_this() _NOEXCEPT
        { return __weak_this_; }
@@ -1833,7 +1914,7 @@
     _LIBCPP_INLINE_VISIBILITY
     weak_ptr<const _Tp> weak_from_this() const _NOEXCEPT
         { return __weak_this_; }
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
     template <class _Up> friend class shared_ptr;
 };
diff --git a/third_party/llvm-project/libcxx/include/__memory/swap_allocator.h b/third_party/llvm-project/libcxx/include/__memory/swap_allocator.h
index c6e1751..90851cb 100644
--- a/third_party/llvm-project/libcxx/include/__memory/swap_allocator.h
+++ b/third_party/llvm-project/libcxx/include/__memory/swap_allocator.h
@@ -23,7 +23,7 @@
 
 template <typename _Alloc>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2, true_type)
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _NOEXCEPT
 #else
     _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
@@ -39,7 +39,7 @@
 
 template <typename _Alloc>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2)
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _NOEXCEPT
 #else
     _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
diff --git a/third_party/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h b/third_party/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
index 63a45b2..d860cee 100644
--- a/third_party/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
+++ b/third_party/llvm-project/libcxx/include/__memory/uninitialized_algorithms.h
@@ -58,12 +58,12 @@
 __uninitialized_copy(_InputIterator __ifirst, _Sentinel1 __ilast,
                      _ForwardIterator __ofirst, _Sentinel2 __olast) {
   _ForwardIterator __idx = __ofirst;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif
     for (; __ifirst != __ilast && __idx != __olast; ++__ifirst, (void)++__idx)
       ::new (_VSTD::__voidify(*__idx)) _ValueType(*__ifirst);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
     _VSTD::__destroy(__ofirst, __idx);
     throw;
@@ -90,12 +90,12 @@
 __uninitialized_copy_n(_InputIterator __ifirst, _Size __n,
                        _ForwardIterator __ofirst, _Sentinel __olast) {
   _ForwardIterator __idx = __ofirst;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif
     for (; __n > 0 && __idx != __olast; ++__ifirst, (void)++__idx, (void)--__n)
       ::new (_VSTD::__voidify(*__idx)) _ValueType(*__ifirst);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
     _VSTD::__destroy(__ofirst, __idx);
     throw;
@@ -121,13 +121,13 @@
 _ForwardIterator __uninitialized_fill(_ForwardIterator __first, _Sentinel __last, const _Tp& __x)
 {
     _ForwardIterator __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
 #endif
         for (; __idx != __last; ++__idx)
             ::new (_VSTD::__voidify(*__idx)) _ValueType(__x);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -154,13 +154,13 @@
 _ForwardIterator __uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)
 {
     _ForwardIterator __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
 #endif
         for (; __n > 0; ++__idx, (void) --__n)
             ::new (_VSTD::__voidify(*__idx)) _ValueType(__x);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -180,7 +180,7 @@
     return _VSTD::__uninitialized_fill_n<_ValueType>(__first, __n, __x);
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 // uninitialized_default_construct
 
@@ -188,12 +188,12 @@
 inline _LIBCPP_HIDE_FROM_ABI
 _ForwardIterator __uninitialized_default_construct(_ForwardIterator __first, _Sentinel __last) {
     auto __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
 #endif
     for (; __idx != __last; ++__idx)
         ::new (_VSTD::__voidify(*__idx)) _ValueType;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
         _VSTD::__destroy(__first, __idx);
         throw;
@@ -217,12 +217,12 @@
 inline _LIBCPP_HIDE_FROM_ABI
 _ForwardIterator __uninitialized_default_construct_n(_ForwardIterator __first, _Size __n) {
     auto __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
 #endif
     for (; __n > 0; ++__idx, (void) --__n)
         ::new (_VSTD::__voidify(*__idx)) _ValueType;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
         _VSTD::__destroy(__first, __idx);
         throw;
@@ -245,12 +245,12 @@
 inline _LIBCPP_HIDE_FROM_ABI
 _ForwardIterator __uninitialized_value_construct(_ForwardIterator __first, _Sentinel __last) {
     auto __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
 #endif
     for (; __idx != __last; ++__idx)
         ::new (_VSTD::__voidify(*__idx)) _ValueType();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
         _VSTD::__destroy(__first, __idx);
         throw;
@@ -274,12 +274,12 @@
 inline _LIBCPP_HIDE_FROM_ABI
 _ForwardIterator __uninitialized_value_construct_n(_ForwardIterator __first, _Size __n) {
     auto __idx = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
 #endif
     for (; __n > 0; ++__idx, (void) --__n)
         ::new (_VSTD::__voidify(*__idx)) _ValueType();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
         _VSTD::__destroy(__first, __idx);
         throw;
@@ -304,13 +304,13 @@
 __uninitialized_move(_InputIterator __ifirst, _Sentinel1 __ilast,
                      _ForwardIterator __ofirst, _Sentinel2 __olast, _IterMove __iter_move) {
   auto __idx = __ofirst;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif
     for (; __ifirst != __ilast && __idx != __olast; ++__idx, (void)++__ifirst) {
       ::new (_VSTD::__voidify(*__idx)) _ValueType(__iter_move(__ifirst));
     }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
     _VSTD::__destroy(__ofirst, __idx);
     throw;
@@ -338,12 +338,12 @@
 __uninitialized_move_n(_InputIterator __ifirst, _Size __n,
                        _ForwardIterator __ofirst, _Sentinel __olast, _IterMove __iter_move) {
   auto __idx = __ofirst;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif
     for (; __n > 0 && __idx != __olast; ++__idx, (void)++__ifirst, --__n)
       ::new (_VSTD::__voidify(*__idx)) _ValueType(__iter_move(__ifirst));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
     _VSTD::__destroy(__ofirst, __idx);
     throw;
@@ -410,7 +410,7 @@
 // This function assumes that the allocator is bound to the correct type.
 template<class _Alloc, class _Tp>
 _LIBCPP_HIDE_FROM_ABI
-constexpr void __allocator_construct_at(_Alloc& __alloc, _Tp* __loc) {
+constexpr void __allocator_construct_at_multidimensional(_Alloc& __alloc, _Tp* __loc) {
     static_assert(is_same_v<typename allocator_traits<_Alloc>::value_type, _Tp>,
         "The allocator should already be rebound to the correct type");
 
@@ -421,12 +421,12 @@
         _Tp& __array = *__loc;
 
         // If an exception is thrown, destroy what we have constructed so far in reverse order.
-        __exception_guard __guard([&]() {
+        auto __guard = std::__make_exception_guard([&]() {
           std::__allocator_destroy_multidimensional(__elem_alloc, __array, __array + __i);
         });
 
         for (; __i != extent_v<_Tp>; ++__i) {
-            std::__allocator_construct_at(__elem_alloc, std::addressof(__array[__i]));
+            std::__allocator_construct_at_multidimensional(__elem_alloc, std::addressof(__array[__i]));
         }
         __guard.__complete();
     } else {
@@ -446,13 +446,13 @@
 // This function assumes that the allocator is bound to the correct type.
 template<class _Alloc, class _Tp, class _Arg>
 _LIBCPP_HIDE_FROM_ABI
-constexpr void __allocator_construct_at(_Alloc& __alloc, _Tp* __loc, _Arg const& __arg) {
+constexpr void __allocator_construct_at_multidimensional(_Alloc& __alloc, _Tp* __loc, _Arg const& __arg) {
     static_assert(is_same_v<typename allocator_traits<_Alloc>::value_type, _Tp>,
         "The allocator should already be rebound to the correct type");
 
     if constexpr (is_array_v<_Tp>) {
         static_assert(is_array_v<_Arg>,
-            "Provided non-array initialization argument to __allocator_construct_at when "
+            "Provided non-array initialization argument to __allocator_construct_at_multidimensional when "
             "trying to construct an array.");
 
         using _Element = remove_extent_t<_Tp>;
@@ -461,11 +461,11 @@
         _Tp& __array = *__loc;
 
         // If an exception is thrown, destroy what we have constructed so far in reverse order.
-        __exception_guard __guard([&]() {
+        auto __guard = std::__make_exception_guard([&]() {
           std::__allocator_destroy_multidimensional(__elem_alloc, __array, __array + __i);
         });
         for (; __i != extent_v<_Tp>; ++__i) {
-            std::__allocator_construct_at(__elem_alloc, std::addressof(__array[__i]), __arg[__i]);
+            std::__allocator_construct_at_multidimensional(__elem_alloc, std::addressof(__array[__i]), __arg[__i]);
         }
         __guard.__complete();
     } else {
@@ -481,38 +481,38 @@
 // initialization using allocator_traits destruction. If the elements in the range are C-style
 // arrays, they are initialized element-wise using allocator construction, and recursively so.
 template<class _Alloc, class _BidirIter, class _Tp, class _Size = typename iterator_traits<_BidirIter>::difference_type>
-_LIBCPP_HIDE_FROM_ABI
-constexpr void __uninitialized_allocator_fill_n(_Alloc& __alloc, _BidirIter __it, _Size __n, _Tp const& __value) {
+_LIBCPP_HIDE_FROM_ABI constexpr void
+__uninitialized_allocator_fill_n_multidimensional(_Alloc& __alloc, _BidirIter __it, _Size __n, _Tp const& __value) {
     using _ValueType = typename iterator_traits<_BidirIter>::value_type;
     __allocator_traits_rebind_t<_Alloc, _ValueType> __value_alloc(__alloc);
     _BidirIter __begin = __it;
 
     // If an exception is thrown, destroy what we have constructed so far in reverse order.
-    __exception_guard __guard([&]() { std::__allocator_destroy_multidimensional(__value_alloc, __begin, __it); });
+    auto __guard = std::__make_exception_guard([&]() { std::__allocator_destroy_multidimensional(__value_alloc, __begin, __it); });
     for (; __n != 0; --__n, ++__it) {
-        std::__allocator_construct_at(__value_alloc, std::addressof(*__it), __value);
+        std::__allocator_construct_at_multidimensional(__value_alloc, std::addressof(*__it), __value);
     }
     __guard.__complete();
 }
 
-// Same as __uninitialized_allocator_fill_n, but doesn't pass any initialization argument
+// Same as __uninitialized_allocator_fill_n_multidimensional, but doesn't pass any initialization argument
 // to the allocator's construct method, which results in value initialization.
-template<class _Alloc, class _BidirIter, class _Size = typename iterator_traits<_BidirIter>::difference_type>
-_LIBCPP_HIDE_FROM_ABI
-constexpr void __uninitialized_allocator_value_construct_n(_Alloc& __alloc, _BidirIter __it, _Size __n) {
+template <class _Alloc, class _BidirIter, class _Size = typename iterator_traits<_BidirIter>::difference_type>
+_LIBCPP_HIDE_FROM_ABI constexpr void
+__uninitialized_allocator_value_construct_n_multidimensional(_Alloc& __alloc, _BidirIter __it, _Size __n) {
     using _ValueType = typename iterator_traits<_BidirIter>::value_type;
     __allocator_traits_rebind_t<_Alloc, _ValueType> __value_alloc(__alloc);
     _BidirIter __begin = __it;
 
     // If an exception is thrown, destroy what we have constructed so far in reverse order.
-    __exception_guard __guard([&]() { std::__allocator_destroy_multidimensional(__value_alloc, __begin, __it); });
+    auto __guard = std::__make_exception_guard([&]() { std::__allocator_destroy_multidimensional(__value_alloc, __begin, __it); });
     for (; __n != 0; --__n, ++__it) {
-        std::__allocator_construct_at(__value_alloc, std::addressof(*__it));
+        std::__allocator_construct_at_multidimensional(__value_alloc, std::addressof(*__it));
     }
     __guard.__complete();
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 // Destroy all elements in [__first, __last) from left to right using allocator destruction.
 template <class _Alloc, class _Iter, class _Sent>
@@ -600,7 +600,7 @@
   auto __guard =
       std::__make_exception_guard(_AllocatorDestroyRangeReverse<_Alloc, _Iter2>(__alloc, __destruct_first, __first2));
   while (__first1 != __last1) {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     allocator_traits<_Alloc>::construct(__alloc, std::__to_address(__first2), std::move_if_noexcept(*__first1));
 #else
     allocator_traits<_Alloc>::construct(__alloc, std::__to_address(__first2), std::move(*__first1));
diff --git a/third_party/llvm-project/libcxx/include/__memory/unique_ptr.h b/third_party/llvm-project/libcxx/include/__memory/unique_ptr.h
index 9cdbda8..b30f8b2 100644
--- a/third_party/llvm-project/libcxx/include/__memory/unique_ptr.h
+++ b/third_party/llvm-project/libcxx/include/__memory/unique_ptr.h
@@ -115,7 +115,7 @@
 };
 
 #if defined(_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI)
-#  define _LIBCPP_UNIQUE_PTR_TRIVIAL_ABI __attribute__((trivial_abi))
+#  define _LIBCPP_UNIQUE_PTR_TRIVIAL_ABI __attribute__((__trivial_abi__))
 #else
 #  define _LIBCPP_UNIQUE_PTR_TRIVIAL_ABI
 #endif
@@ -556,7 +556,7 @@
 operator>=(const unique_ptr<_T1, _D1>& __x, const unique_ptr<_T2, _D2>& __y) {return !(__x < __y);}
 
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _T1, class _D1, class _T2, class _D2>
 requires three_way_comparable_with<typename unique_ptr<_T1, _D1>::pointer,
                                    typename unique_ptr<_T2, _D2>::pointer>
@@ -650,7 +650,7 @@
   return !(nullptr < __x);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _T1, class _D1>
   requires three_way_comparable<
       typename unique_ptr<_T1, _D1>::pointer> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23
@@ -660,7 +660,7 @@
 }
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template<class _Tp>
 struct __unique_if
@@ -697,7 +697,7 @@
     typename __unique_if<_Tp>::__unique_array_known_bound
     make_unique(_Args&&...) = delete;
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 #if _LIBCPP_STD_VER >= 20
 
diff --git a/third_party/llvm-project/libcxx/include/__memory/uses_allocator.h b/third_party/llvm-project/libcxx/include/__memory/uses_allocator.h
index fe89704..f82ac179 100644
--- a/third_party/llvm-project/libcxx/include/__memory/uses_allocator.h
+++ b/third_party/llvm-project/libcxx/include/__memory/uses_allocator.h
@@ -49,9 +49,9 @@
 {
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Alloc>
-inline constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
+inline constexpr bool uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/__memory/uses_allocator_construction.h b/third_party/llvm-project/libcxx/include/__memory/uses_allocator_construction.h
index 0f63b08..c6eccd2 100644
--- a/third_party/llvm-project/libcxx/include/__memory/uses_allocator_construction.h
+++ b/third_party/llvm-project/libcxx/include/__memory/uses_allocator_construction.h
@@ -83,7 +83,7 @@
       std::forward_as_tuple(std::forward<_Vp>(__v)));
 }
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI constexpr auto
 __uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>& __pair) noexcept {
@@ -109,7 +109,7 @@
       std::forward_as_tuple(std::get<1>(std::move(__pair))));
 }
 
-#  if _LIBCPP_STD_VER > 20
+#  if _LIBCPP_STD_VER >= 23
 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI constexpr auto
 __uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>&& __pair) noexcept {
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/memory_resource.h b/third_party/llvm-project/libcxx/include/__memory_resource/memory_resource.h
index 02fdd08..4f0e4e4 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/memory_resource.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/memory_resource.h
@@ -16,7 +16,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -70,6 +70,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/monotonic_buffer_resource.h b/third_party/llvm-project/libcxx/include/__memory_resource/monotonic_buffer_resource.h
index 5b0d246..9878471 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/monotonic_buffer_resource.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/monotonic_buffer_resource.h
@@ -18,7 +18,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -115,6 +115,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___MEMORY_RESOURCE_MONOTONIC_BUFFER_RESOURCE_H
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/polymorphic_allocator.h b/third_party/llvm-project/libcxx/include/__memory_resource/polymorphic_allocator.h
index 2489502..c52adc4 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/polymorphic_allocator.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/polymorphic_allocator.h
@@ -26,7 +26,7 @@
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -98,7 +98,7 @@
   template <class _Type, class... _CtorArgs>
   [[nodiscard]] _Type* new_object(_CtorArgs&&... __ctor_args) {
     _Type* __ptr = allocate_object<_Type>();
-    __exception_guard __guard([&] { deallocate_object(__ptr); });
+    auto __guard = std::__make_exception_guard([&] { deallocate_object(__ptr); });
     construct(__ptr, std::forward<_CtorArgs>(__ctor_args)...);
     __guard.__complete();
     return __ptr;
@@ -217,7 +217,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_POP_MACROS
 
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/pool_options.h b/third_party/llvm-project/libcxx/include/__memory_resource/pool_options.h
index 11585a0..6ddd899 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/pool_options.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/pool_options.h
@@ -16,7 +16,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -33,6 +33,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___MEMORY_RESOURCE_POOL_OPTIONS_H
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/synchronized_pool_resource.h b/third_party/llvm-project/libcxx/include/__memory_resource/synchronized_pool_resource.h
index 1877147..b86ba06 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/synchronized_pool_resource.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/synchronized_pool_resource.h
@@ -22,7 +22,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -89,6 +89,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___MEMORY_RESOURCE_SYNCHRONIZED_POOL_RESOURCE_H
diff --git a/third_party/llvm-project/libcxx/include/__memory_resource/unsynchronized_pool_resource.h b/third_party/llvm-project/libcxx/include/__memory_resource/unsynchronized_pool_resource.h
index 91d38aa..26e4bdf 100644
--- a/third_party/llvm-project/libcxx/include/__memory_resource/unsynchronized_pool_resource.h
+++ b/third_party/llvm-project/libcxx/include/__memory_resource/unsynchronized_pool_resource.h
@@ -19,7 +19,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -101,6 +101,6 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // _LIBCPP___MEMORY_RESOURCE_UNSYNCHRONIZED_POOL_RESOURCE_H
diff --git a/third_party/llvm-project/libcxx/include/__mutex/lock_guard.h b/third_party/llvm-project/libcxx/include/__mutex/lock_guard.h
new file mode 100644
index 0000000..c075512
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__mutex/lock_guard.h
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MUTEX_LOCK_GUARD_H
+#define _LIBCPP___MUTEX_LOCK_GUARD_H
+
+#include <__config>
+#include <__mutex/tag_types.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Mutex>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) lock_guard {
+public:
+  typedef _Mutex mutex_type;
+
+private:
+  mutex_type& __m_;
+
+public:
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI explicit lock_guard(mutex_type& __m)
+      _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
+      : __m_(__m) {
+    __m_.lock();
+  }
+
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI lock_guard(mutex_type& __m, adopt_lock_t)
+      _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
+      : __m_(__m) {}
+  _LIBCPP_HIDE_FROM_ABI ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) { __m_.unlock(); }
+
+private:
+  lock_guard(lock_guard const&)            = delete;
+  lock_guard& operator=(lock_guard const&) = delete;
+};
+_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard);
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+#endif // _LIBCPP___MUTEX_LOCK_GUARD_H
diff --git a/third_party/llvm-project/libcxx/include/__mutex/mutex.h b/third_party/llvm-project/libcxx/include/__mutex/mutex.h
new file mode 100644
index 0000000..13def1e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__mutex/mutex.h
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MUTEX_MUTEX_H
+#define _LIBCPP___MUTEX_MUTEX_H
+
+#include <__config>
+#include <__threading_support>
+#include <__type_traits/is_nothrow_default_constructible.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex {
+  __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR mutex() = default;
+
+  mutex(const mutex&)            = delete;
+  mutex& operator=(const mutex&) = delete;
+
+#  if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
+  ~mutex() = default;
+#  else
+  ~mutex() _NOEXCEPT;
+#  endif
+
+  void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability());
+  bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true));
+  void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability());
+
+  typedef __libcpp_mutex_t* native_handle_type;
+  _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return &__m_; }
+};
+
+static_assert(is_nothrow_default_constructible<mutex>::value, "the default constructor for std::mutex must be nothrow");
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+#endif // _LIBCPP___MUTEX_MUTEX_H
diff --git a/third_party/llvm-project/libcxx/include/__mutex/tag_types.h b/third_party/llvm-project/libcxx/include/__mutex/tag_types.h
new file mode 100644
index 0000000..02cf007
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__mutex/tag_types.h
@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MUTEX_TAG_TYPES_H
+#define _LIBCPP___MUTEX_TAG_TYPES_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct _LIBCPP_TYPE_VIS defer_lock_t {
+  explicit defer_lock_t() = default;
+};
+
+struct _LIBCPP_TYPE_VIS try_to_lock_t {
+  explicit try_to_lock_t() = default;
+};
+
+struct _LIBCPP_TYPE_VIS adopt_lock_t {
+  explicit adopt_lock_t() = default;
+};
+
+#  if defined(_LIBCPP_BUILDING_LIBRARY)
+extern _LIBCPP_EXPORTED_FROM_ABI const defer_lock_t defer_lock;
+extern _LIBCPP_EXPORTED_FROM_ABI const try_to_lock_t try_to_lock;
+extern _LIBCPP_EXPORTED_FROM_ABI const adopt_lock_t adopt_lock;
+#  elif !defined(_LIBCPP_CXX03_LANG)
+/* inline */ constexpr defer_lock_t defer_lock   = defer_lock_t();
+/* inline */ constexpr try_to_lock_t try_to_lock = try_to_lock_t();
+/* inline */ constexpr adopt_lock_t adopt_lock   = adopt_lock_t();
+#  endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+#endif // _LIBCPP___MUTEX_TAG_TYPES_H
diff --git a/third_party/llvm-project/libcxx/include/__mutex/unique_lock.h b/third_party/llvm-project/libcxx/include/__mutex/unique_lock.h
new file mode 100644
index 0000000..c27ce4b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__mutex/unique_lock.h
@@ -0,0 +1,173 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MUTEX_UNIQUE_LOCK_H
+#define _LIBCPP___MUTEX_UNIQUE_LOCK_H
+
+#include <__chrono/duration.h>
+#include <__chrono/time_point.h>
+#include <__config>
+#include <__memory/addressof.h>
+#include <__mutex/tag_types.h>
+#include <__system_error/system_error.h>
+#include <__utility/swap.h>
+#include <cerrno>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Mutex>
+class _LIBCPP_TEMPLATE_VIS unique_lock {
+public:
+  typedef _Mutex mutex_type;
+
+private:
+  mutex_type* __m_;
+  bool __owns_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {}
+  _LIBCPP_HIDE_FROM_ABI explicit unique_lock(mutex_type& __m) : __m_(std::addressof(__m)), __owns_(true) {
+    __m_->lock();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT
+      : __m_(std::addressof(__m)),
+        __owns_(false) {}
+
+  _LIBCPP_HIDE_FROM_ABI unique_lock(mutex_type& __m, try_to_lock_t)
+      : __m_(std::addressof(__m)), __owns_(__m.try_lock()) {}
+
+  _LIBCPP_HIDE_FROM_ABI unique_lock(mutex_type& __m, adopt_lock_t) : __m_(std::addressof(__m)), __owns_(true) {}
+
+  template <class _Clock, class _Duration>
+  _LIBCPP_HIDE_FROM_ABI unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
+      : __m_(std::addressof(__m)), __owns_(__m.try_lock_until(__t)) {}
+
+  template <class _Rep, class _Period>
+  _LIBCPP_HIDE_FROM_ABI unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
+      : __m_(std::addressof(__m)), __owns_(__m.try_lock_for(__d)) {}
+
+  _LIBCPP_HIDE_FROM_ABI ~unique_lock() {
+    if (__owns_)
+      __m_->unlock();
+  }
+
+  unique_lock(unique_lock const&)            = delete;
+  unique_lock& operator=(unique_lock const&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI unique_lock(unique_lock&& __u) _NOEXCEPT : __m_(__u.__m_), __owns_(__u.__owns_) {
+    __u.__m_    = nullptr;
+    __u.__owns_ = false;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI unique_lock& operator=(unique_lock&& __u) _NOEXCEPT {
+    if (__owns_)
+      __m_->unlock();
+
+    __m_        = __u.__m_;
+    __owns_     = __u.__owns_;
+    __u.__m_    = nullptr;
+    __u.__owns_ = false;
+    return *this;
+  }
+
+  void lock();
+  bool try_lock();
+
+  template <class _Rep, class _Period>
+  bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
+
+  template <class _Clock, class _Duration>
+  bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
+
+  void unlock();
+
+  _LIBCPP_HIDE_FROM_ABI void swap(unique_lock& __u) _NOEXCEPT {
+    std::swap(__m_, __u.__m_);
+    std::swap(__owns_, __u.__owns_);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI mutex_type* release() _NOEXCEPT {
+    mutex_type* __m = __m_;
+    __m_            = nullptr;
+    __owns_         = false;
+    return __m;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI bool owns_lock() const _NOEXCEPT { return __owns_; }
+  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __owns_; }
+  _LIBCPP_HIDE_FROM_ABI mutex_type* mutex() const _NOEXCEPT { return __m_; }
+};
+_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(unique_lock);
+
+template <class _Mutex>
+void unique_lock<_Mutex>::lock() {
+  if (__m_ == nullptr)
+    __throw_system_error(EPERM, "unique_lock::lock: references null mutex");
+  if (__owns_)
+    __throw_system_error(EDEADLK, "unique_lock::lock: already locked");
+  __m_->lock();
+  __owns_ = true;
+}
+
+template <class _Mutex>
+bool unique_lock<_Mutex>::try_lock() {
+  if (__m_ == nullptr)
+    __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
+  if (__owns_)
+    __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
+  __owns_ = __m_->try_lock();
+  return __owns_;
+}
+
+template <class _Mutex>
+template <class _Rep, class _Period>
+bool unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) {
+  if (__m_ == nullptr)
+    __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
+  if (__owns_)
+    __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
+  __owns_ = __m_->try_lock_for(__d);
+  return __owns_;
+}
+
+template <class _Mutex>
+template <class _Clock, class _Duration>
+bool unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) {
+  if (__m_ == nullptr)
+    __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
+  if (__owns_)
+    __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
+  __owns_ = __m_->try_lock_until(__t);
+  return __owns_;
+}
+
+template <class _Mutex>
+void unique_lock<_Mutex>::unlock() {
+  if (!__owns_)
+    __throw_system_error(EPERM, "unique_lock::unlock: not locked");
+  __m_->unlock();
+  __owns_ = false;
+}
+
+template <class _Mutex>
+inline _LIBCPP_HIDE_FROM_ABI void swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT {
+  __x.swap(__y);
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+#endif // _LIBCPP___MUTEX_UNIQUE_LOCK_H
diff --git a/third_party/llvm-project/libcxx/include/__mutex_base b/third_party/llvm-project/libcxx/include/__mutex_base
deleted file mode 100644
index 82d9fa6..0000000
--- a/third_party/llvm-project/libcxx/include/__mutex_base
+++ /dev/null
@@ -1,523 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___MUTEX_BASE
-#define _LIBCPP___MUTEX_BASE
-
-#include <__chrono/duration.h>
-#include <__chrono/steady_clock.h>
-#include <__chrono/system_clock.h>
-#include <__chrono/time_point.h>
-#include <__config>
-#include <__threading_support>
-#include <ratio>
-#include <system_error>
-#include <time.h>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_PUSH_MACROS
-#include <__undef_macros>
-
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#ifndef _LIBCPP_HAS_NO_THREADS
-
-class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex
-{
-    __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR mutex() = default;
-
-    mutex(const mutex&) = delete;
-    mutex& operator=(const mutex&) = delete;
-
-#if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
-    ~mutex() = default;
-#else
-    ~mutex() _NOEXCEPT;
-#endif
-
-    void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability());
-    bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true));
-    void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability());
-
-    typedef __libcpp_mutex_t* native_handle_type;
-    _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
-};
-
-static_assert(is_nothrow_default_constructible<mutex>::value,
-              "the default constructor for std::mutex must be nothrow");
-
-struct _LIBCPP_TYPE_VIS defer_lock_t { explicit defer_lock_t() = default; };
-struct _LIBCPP_TYPE_VIS try_to_lock_t { explicit try_to_lock_t() = default; };
-struct _LIBCPP_TYPE_VIS adopt_lock_t { explicit adopt_lock_t() = default; };
-
-#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
-
-extern _LIBCPP_EXPORTED_FROM_ABI const defer_lock_t  defer_lock;
-extern _LIBCPP_EXPORTED_FROM_ABI const try_to_lock_t try_to_lock;
-extern _LIBCPP_EXPORTED_FROM_ABI const adopt_lock_t  adopt_lock;
-
-#else
-
-/* inline */ constexpr defer_lock_t  defer_lock  = defer_lock_t();
-/* inline */ constexpr try_to_lock_t try_to_lock = try_to_lock_t();
-/* inline */ constexpr adopt_lock_t  adopt_lock  = adopt_lock_t();
-
-#endif
-
-template <class _Mutex>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable)
-lock_guard
-{
-public:
-    typedef _Mutex mutex_type;
-
-private:
-    mutex_type& __m_;
-public:
-
-    _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
-    explicit lock_guard(mutex_type& __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
-        : __m_(__m) {__m_.lock();}
-
-    _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
-    lock_guard(mutex_type& __m, adopt_lock_t) _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
-        : __m_(__m) {}
-    _LIBCPP_INLINE_VISIBILITY
-    ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();}
-
-private:
-    lock_guard(lock_guard const&) = delete;
-    lock_guard& operator=(lock_guard const&) = delete;
-};
-_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard);
-
-template <class _Mutex>
-class _LIBCPP_TEMPLATE_VIS unique_lock
-{
-public:
-    typedef _Mutex mutex_type;
-
-private:
-    mutex_type* __m_;
-    bool __owns_;
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {}
-    _LIBCPP_INLINE_VISIBILITY
-    explicit unique_lock(mutex_type& __m)
-        : __m_(_VSTD::addressof(__m)), __owns_(true) {__m_->lock();}
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT
-        : __m_(_VSTD::addressof(__m)), __owns_(false) {}
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock(mutex_type& __m, try_to_lock_t)
-        : __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock()) {}
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock(mutex_type& __m, adopt_lock_t)
-        : __m_(_VSTD::addressof(__m)), __owns_(true) {}
-    template <class _Clock, class _Duration>
-    _LIBCPP_INLINE_VISIBILITY
-        unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
-            : __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_until(__t)) {}
-    template <class _Rep, class _Period>
-    _LIBCPP_INLINE_VISIBILITY
-        unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
-            : __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_for(__d)) {}
-    _LIBCPP_INLINE_VISIBILITY
-    ~unique_lock()
-    {
-        if (__owns_)
-            __m_->unlock();
-    }
-
-    unique_lock(unique_lock const&) = delete;
-    unique_lock& operator=(unique_lock const&) = delete;
-
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock(unique_lock&& __u) _NOEXCEPT
-        : __m_(__u.__m_), __owns_(__u.__owns_)
-        {__u.__m_ = nullptr; __u.__owns_ = false;}
-    _LIBCPP_INLINE_VISIBILITY
-    unique_lock& operator=(unique_lock&& __u) _NOEXCEPT
-        {
-            if (__owns_)
-                __m_->unlock();
-            __m_ = __u.__m_;
-            __owns_ = __u.__owns_;
-            __u.__m_ = nullptr;
-            __u.__owns_ = false;
-            return *this;
-        }
-
-    void lock();
-    bool try_lock();
-
-    template <class _Rep, class _Period>
-        bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
-    template <class _Clock, class _Duration>
-        bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
-
-    void unlock();
-
-    _LIBCPP_INLINE_VISIBILITY
-    void swap(unique_lock& __u) _NOEXCEPT
-    {
-        _VSTD::swap(__m_, __u.__m_);
-        _VSTD::swap(__owns_, __u.__owns_);
-    }
-    _LIBCPP_INLINE_VISIBILITY
-    mutex_type* release() _NOEXCEPT
-    {
-        mutex_type* __m = __m_;
-        __m_ = nullptr;
-        __owns_ = false;
-        return __m;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool owns_lock() const _NOEXCEPT {return __owns_;}
-    _LIBCPP_INLINE_VISIBILITY
-    explicit operator bool() const _NOEXCEPT {return __owns_;}
-    _LIBCPP_INLINE_VISIBILITY
-    mutex_type* mutex() const _NOEXCEPT {return __m_;}
-};
-_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(unique_lock);
-
-template <class _Mutex>
-void
-unique_lock<_Mutex>::lock()
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "unique_lock::lock: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "unique_lock::lock: already locked");
-    __m_->lock();
-    __owns_ = true;
-}
-
-template <class _Mutex>
-bool
-unique_lock<_Mutex>::try_lock()
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
-    __owns_ = __m_->try_lock();
-    return __owns_;
-}
-
-template <class _Mutex>
-template <class _Rep, class _Period>
-bool
-unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
-    __owns_ = __m_->try_lock_for(__d);
-    return __owns_;
-}
-
-template <class _Mutex>
-template <class _Clock, class _Duration>
-bool
-unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
-    __owns_ = __m_->try_lock_until(__t);
-    return __owns_;
-}
-
-template <class _Mutex>
-void
-unique_lock<_Mutex>::unlock()
-{
-    if (!__owns_)
-        __throw_system_error(EPERM, "unique_lock::unlock: not locked");
-    __m_->unlock();
-    __owns_ = false;
-}
-
-template <class _Mutex>
-inline _LIBCPP_INLINE_VISIBILITY
-void
-swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT
-    {__x.swap(__y);}
-
-//enum class cv_status
-_LIBCPP_DECLARE_STRONG_ENUM(cv_status)
-{
-    no_timeout,
-    timeout
-};
-_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status)
-
-class _LIBCPP_TYPE_VIS condition_variable
-{
-    __libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR condition_variable() _NOEXCEPT = default;
-
-#ifdef _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
-    ~condition_variable() = default;
-#else
-    ~condition_variable();
-#endif
-
-    condition_variable(const condition_variable&) = delete;
-    condition_variable& operator=(const condition_variable&) = delete;
-
-    void notify_one() _NOEXCEPT;
-    void notify_all() _NOEXCEPT;
-
-    void wait(unique_lock<mutex>& __lk) _NOEXCEPT;
-    template <class _Predicate>
-        _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-        void wait(unique_lock<mutex>& __lk, _Predicate __pred);
-
-    template <class _Clock, class _Duration>
-        _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-        cv_status
-        wait_until(unique_lock<mutex>& __lk,
-                   const chrono::time_point<_Clock, _Duration>& __t);
-
-    template <class _Clock, class _Duration, class _Predicate>
-        _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-        bool
-        wait_until(unique_lock<mutex>& __lk,
-                   const chrono::time_point<_Clock, _Duration>& __t,
-                   _Predicate __pred);
-
-    template <class _Rep, class _Period>
-        _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-        cv_status
-        wait_for(unique_lock<mutex>& __lk,
-                 const chrono::duration<_Rep, _Period>& __d);
-
-    template <class _Rep, class _Period, class _Predicate>
-        bool
-        _LIBCPP_INLINE_VISIBILITY
-        wait_for(unique_lock<mutex>& __lk,
-                 const chrono::duration<_Rep, _Period>& __d,
-                 _Predicate __pred);
-
-    typedef __libcpp_condvar_t* native_handle_type;
-    _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
-
-private:
-    void __do_timed_wait(unique_lock<mutex>& __lk,
-       chrono::time_point<chrono::system_clock, chrono::nanoseconds>) _NOEXCEPT;
-#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
-    void __do_timed_wait(unique_lock<mutex>& __lk,
-       chrono::time_point<chrono::steady_clock, chrono::nanoseconds>) _NOEXCEPT;
-#endif
-    template <class _Clock>
-    void __do_timed_wait(unique_lock<mutex>& __lk,
-       chrono::time_point<_Clock, chrono::nanoseconds>) _NOEXCEPT;
-};
-#endif // !_LIBCPP_HAS_NO_THREADS
-
-template <class _Rep, class _Period>
-inline _LIBCPP_INLINE_VISIBILITY
-__enable_if_t<is_floating_point<_Rep>::value, chrono::nanoseconds>
-__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
-{
-    using namespace chrono;
-    using __ratio = ratio_divide<_Period, nano>;
-    using __ns_rep = nanoseconds::rep;
-    _Rep __result_float = __d.count() * __ratio::num / __ratio::den;
-
-    _Rep __result_max = numeric_limits<__ns_rep>::max();
-    if (__result_float >= __result_max) {
-        return nanoseconds::max();
-    }
-
-    _Rep __result_min = numeric_limits<__ns_rep>::min();
-    if (__result_float <= __result_min) {
-        return nanoseconds::min();
-    }
-
-    return nanoseconds(static_cast<__ns_rep>(__result_float));
-}
-
-template <class _Rep, class _Period>
-inline _LIBCPP_INLINE_VISIBILITY
-__enable_if_t<!is_floating_point<_Rep>::value, chrono::nanoseconds>
-__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
-{
-    using namespace chrono;
-    if (__d.count() == 0) {
-        return nanoseconds(0);
-    }
-
-    using __ratio = ratio_divide<_Period, nano>;
-    using __ns_rep = nanoseconds::rep;
-    __ns_rep __result_max = numeric_limits<__ns_rep>::max();
-    if (__d.count() > 0 && __d.count() > __result_max / __ratio::num) {
-        return nanoseconds::max();
-    }
-
-    __ns_rep __result_min = numeric_limits<__ns_rep>::min();
-    if (__d.count() < 0 && __d.count() < __result_min / __ratio::num) {
-        return nanoseconds::min();
-    }
-
-    __ns_rep __result = __d.count() * __ratio::num / __ratio::den;
-    if (__result == 0) {
-        return nanoseconds(1);
-    }
-
-    return nanoseconds(__result);
-}
-
-#ifndef _LIBCPP_HAS_NO_THREADS
-template <class _Predicate>
-void
-condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
-{
-    while (!__pred())
-        wait(__lk);
-}
-
-template <class _Clock, class _Duration>
-cv_status
-condition_variable::wait_until(unique_lock<mutex>& __lk,
-                               const chrono::time_point<_Clock, _Duration>& __t)
-{
-    using namespace chrono;
-    using __clock_tp_ns = time_point<_Clock, nanoseconds>;
-
-    typename _Clock::time_point __now = _Clock::now();
-    if (__t <= __now)
-        return cv_status::timeout;
-
-    __clock_tp_ns __t_ns = __clock_tp_ns(_VSTD::__safe_nanosecond_cast(__t.time_since_epoch()));
-
-    __do_timed_wait(__lk, __t_ns);
-    return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
-}
-
-template <class _Clock, class _Duration, class _Predicate>
-bool
-condition_variable::wait_until(unique_lock<mutex>& __lk,
-                   const chrono::time_point<_Clock, _Duration>& __t,
-                   _Predicate __pred)
-{
-    while (!__pred())
-    {
-        if (wait_until(__lk, __t) == cv_status::timeout)
-            return __pred();
-    }
-    return true;
-}
-
-template <class _Rep, class _Period>
-cv_status
-condition_variable::wait_for(unique_lock<mutex>& __lk,
-                             const chrono::duration<_Rep, _Period>& __d)
-{
-    using namespace chrono;
-    if (__d <= __d.zero())
-        return cv_status::timeout;
-    using __ns_rep = nanoseconds::rep;
-    steady_clock::time_point __c_now = steady_clock::now();
-
-#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
-    using __clock_tp_ns = time_point<steady_clock, nanoseconds>;
-    __ns_rep __now_count_ns = _VSTD::__safe_nanosecond_cast(__c_now.time_since_epoch()).count();
-#else
-    using __clock_tp_ns = time_point<system_clock, nanoseconds>;
-    __ns_rep __now_count_ns = _VSTD::__safe_nanosecond_cast(system_clock::now().time_since_epoch()).count();
-#endif
-
-    __ns_rep __d_ns_count = _VSTD::__safe_nanosecond_cast(__d).count();
-
-    if (__now_count_ns > numeric_limits<__ns_rep>::max() - __d_ns_count) {
-        __do_timed_wait(__lk, __clock_tp_ns::max());
-    } else {
-        __do_timed_wait(__lk, __clock_tp_ns(nanoseconds(__now_count_ns + __d_ns_count)));
-    }
-
-    return steady_clock::now() - __c_now < __d ? cv_status::no_timeout :
-                                                 cv_status::timeout;
-}
-
-template <class _Rep, class _Period, class _Predicate>
-inline
-bool
-condition_variable::wait_for(unique_lock<mutex>& __lk,
-                             const chrono::duration<_Rep, _Period>& __d,
-                             _Predicate __pred)
-{
-    return wait_until(__lk, chrono::steady_clock::now() + __d,
-                      _VSTD::move(__pred));
-}
-
-#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
-inline
-void
-condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
-     chrono::time_point<chrono::steady_clock, chrono::nanoseconds> __tp) _NOEXCEPT
-{
-    using namespace chrono;
-    if (!__lk.owns_lock())
-        __throw_system_error(EPERM,
-                            "condition_variable::timed wait: mutex not locked");
-    nanoseconds __d = __tp.time_since_epoch();
-    timespec __ts;
-    seconds __s = duration_cast<seconds>(__d);
-    using __ts_sec = decltype(__ts.tv_sec);
-    const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max();
-    if (__s.count() < __ts_sec_max)
-    {
-        __ts.tv_sec = static_cast<__ts_sec>(__s.count());
-        __ts.tv_nsec = (__d - __s).count();
-    }
-    else
-    {
-        __ts.tv_sec = __ts_sec_max;
-        __ts.tv_nsec = giga::num - 1;
-    }
-    int __ec = pthread_cond_clockwait(&__cv_, __lk.mutex()->native_handle(), CLOCK_MONOTONIC, &__ts);
-    if (__ec != 0 && __ec != ETIMEDOUT)
-        __throw_system_error(__ec, "condition_variable timed_wait failed");
-}
-#endif // _LIBCPP_HAS_COND_CLOCKWAIT
-
-template <class _Clock>
-inline
-void
-condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
-     chrono::time_point<_Clock, chrono::nanoseconds> __tp) _NOEXCEPT
-{
-    wait_for(__lk, __tp - _Clock::now());
-}
-
-#endif // !_LIBCPP_HAS_NO_THREADS
-
-_LIBCPP_END_NAMESPACE_STD
-
-_LIBCPP_POP_MACROS
-
-#endif // _LIBCPP___MUTEX_BASE
diff --git a/third_party/llvm-project/libcxx/include/__node_handle b/third_party/llvm-project/libcxx/include/__node_handle
index bc49272..d9c2374 100644
--- a/third_party/llvm-project/libcxx/include/__node_handle
+++ b/third_party/llvm-project/libcxx/include/__node_handle
@@ -70,7 +70,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 // Specialized in __tree & __hash_table for their _NodeType.
 template <class _NodeType, class _Alloc>
@@ -247,7 +247,7 @@
     _NodeType node;
 };
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/accumulate.h b/third_party/llvm-project/libcxx/include/__numeric/accumulate.h
index 81fc0c2..823d501 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/accumulate.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/accumulate.h
@@ -25,7 +25,7 @@
 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init)
 {
     for (; __first != __last; ++__first)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         __init = _VSTD::move(__init) + *__first;
 #else
         __init = __init + *__first;
@@ -39,7 +39,7 @@
 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOperation __binary_op)
 {
     for (; __first != __last; ++__first)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         __init = __binary_op(_VSTD::move(__init), *__first);
 #else
         __init = __binary_op(__init, *__first);
diff --git a/third_party/llvm-project/libcxx/include/__numeric/adjacent_difference.h b/third_party/llvm-project/libcxx/include/__numeric/adjacent_difference.h
index 57e2f5b..b3519fd 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/adjacent_difference.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/adjacent_difference.h
@@ -32,7 +32,7 @@
         for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
         {
             typename iterator_traits<_InputIterator>::value_type __val(*__first);
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
             *__result = __val - _VSTD::move(__acc);
 #else
             *__result = __val - __acc;
@@ -56,7 +56,7 @@
         for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
         {
             typename iterator_traits<_InputIterator>::value_type __val(*__first);
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
             *__result = __binary_op(__val, _VSTD::move(__acc));
 #else
             *__result = __binary_op(__val, __acc);
diff --git a/third_party/llvm-project/libcxx/include/__numeric/exclusive_scan.h b/third_party/llvm-project/libcxx/include/__numeric/exclusive_scan.h
index d02e126..676ff70 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/exclusive_scan.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/exclusive_scan.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
@@ -46,7 +46,7 @@
   return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>());
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/gcd_lcm.h b/third_party/llvm-project/libcxx/include/__numeric/gcd_lcm.h
index 5a3f81b..7139a7e 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/gcd_lcm.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/gcd_lcm.h
@@ -28,7 +28,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <typename _Result, typename _Source, bool _IsSigned = is_signed<_Source>::value> struct __ct_abs;
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/inclusive_scan.h b/third_party/llvm-project/libcxx/include/__numeric/inclusive_scan.h
index e5bf5ac..bd96344 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/inclusive_scan.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/inclusive_scan.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
@@ -53,7 +53,7 @@
   return _VSTD::inclusive_scan(__first, __last, __result, _VSTD::plus<>());
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/inner_product.h b/third_party/llvm-project/libcxx/include/__numeric/inner_product.h
index e3d68c0..b360200 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/inner_product.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/inner_product.h
@@ -25,7 +25,7 @@
 inner_product(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _Tp __init)
 {
     for (; __first1 != __last1; ++__first1, (void) ++__first2)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         __init = _VSTD::move(__init) + *__first1 * *__first2;
 #else
         __init = __init + *__first1 * *__first2;
@@ -40,7 +40,7 @@
               _Tp __init, _BinaryOperation1 __binary_op1, _BinaryOperation2 __binary_op2)
 {
     for (; __first1 != __last1; ++__first1, (void) ++__first2)
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         __init = __binary_op1(_VSTD::move(__init), __binary_op2(*__first1, *__first2));
 #else
         __init = __binary_op1(__init, __binary_op2(*__first1, *__first2));
diff --git a/third_party/llvm-project/libcxx/include/__numeric/midpoint.h b/third_party/llvm-project/libcxx/include/__numeric/midpoint.h
index bac3642..5325f5e 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/midpoint.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/midpoint.h
@@ -33,7 +33,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp>
 _LIBCPP_INLINE_VISIBILITY constexpr
 enable_if_t<is_integral_v<_Tp> && !is_same_v<bool, _Tp> && !is_null_pointer_v<_Tp>, _Tp>
@@ -86,7 +86,7 @@
       __a/2 + __b/2;                                         // otherwise correctly rounded
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/partial_sum.h b/third_party/llvm-project/libcxx/include/__numeric/partial_sum.h
index 97cca58..94f65d7 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/partial_sum.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/partial_sum.h
@@ -31,7 +31,7 @@
         *__result = __t;
         for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
         {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
             __t = _VSTD::move(__t) + *__first;
 #else
             __t = __t + *__first;
@@ -54,7 +54,7 @@
         *__result = __t;
         for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
         {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
             __t = __binary_op(_VSTD::move(__t), *__first);
 #else
             __t = __binary_op(__t, *__first);
diff --git a/third_party/llvm-project/libcxx/include/__numeric/reduce.h b/third_party/llvm-project/libcxx/include/__numeric/reduce.h
index b64df05..9e710fc 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/reduce.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/reduce.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _InputIterator, class _Tp, class _BinaryOp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp reduce(_InputIterator __first, _InputIterator __last,
                                                                    _Tp __init, _BinaryOp __b) {
diff --git a/third_party/llvm-project/libcxx/include/__numeric/transform_exclusive_scan.h b/third_party/llvm-project/libcxx/include/__numeric/transform_exclusive_scan.h
index afbcdb8..3d5574c 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/transform_exclusive_scan.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/transform_exclusive_scan.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _InputIterator, class _OutputIterator, class _Tp,
           class _BinaryOp, class _UnaryOp>
@@ -42,7 +42,7 @@
     return __result;
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/transform_inclusive_scan.h b/third_party/llvm-project/libcxx/include/__numeric/transform_inclusive_scan.h
index c050041..ee91689 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/transform_inclusive_scan.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/transform_inclusive_scan.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -51,7 +51,7 @@
     return __result;
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__numeric/transform_reduce.h b/third_party/llvm-project/libcxx/include/__numeric/transform_reduce.h
index d997521..39ec266 100644
--- a/third_party/llvm-project/libcxx/include/__numeric/transform_reduce.h
+++ b/third_party/llvm-project/libcxx/include/__numeric/transform_reduce.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _InputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp transform_reduce(_InputIterator __first,
                                                                              _InputIterator __last, _Tp __init,
diff --git a/third_party/llvm-project/libcxx/include/__random/clamp_to_integral.h b/third_party/llvm-project/libcxx/include/__random/clamp_to_integral.h
index 7d44ff9..c67d76d 100644
--- a/third_party/llvm-project/libcxx/include/__random/clamp_to_integral.h
+++ b/third_party/llvm-project/libcxx/include/__random/clamp_to_integral.h
@@ -12,7 +12,6 @@
 #include <__config>
 #include <cmath>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -44,8 +43,8 @@
 _LIBCPP_INLINE_VISIBILITY
 _IntT __clamp_to_integral(_RealT __r) _NOEXCEPT {
   using _Lim = numeric_limits<_IntT>;
-  const _IntT _MaxVal = __max_representable_int_for_float<_IntT, _RealT>();
-  if (__r >= ::nextafter(static_cast<_RealT>(_MaxVal), INFINITY)) {
+  const _IntT __max_val = __max_representable_int_for_float<_IntT, _RealT>();
+  if (__r >= ::nextafter(static_cast<_RealT>(__max_val), INFINITY)) {
     return _Lim::max();
   } else if (__r <= _Lim::lowest()) {
     return _Lim::min();
diff --git a/third_party/llvm-project/libcxx/include/__random/discard_block_engine.h b/third_party/llvm-project/libcxx/include/__random/discard_block_engine.h
index db33623..077f158 100644
--- a/third_party/llvm-project/libcxx/include/__random/discard_block_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/discard_block_engine.h
@@ -11,10 +11,12 @@
 
 #include <__config>
 #include <__random/is_seed_sequence.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_convertible.h>
 #include <__utility/move.h>
+#include <cstddef>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/generate_canonical.h b/third_party/llvm-project/libcxx/include/__random/generate_canonical.h
index 5fada6d..5f0aa6f 100644
--- a/third_party/llvm-project/libcxx/include/__random/generate_canonical.h
+++ b/third_party/llvm-project/libcxx/include/__random/generate_canonical.h
@@ -30,20 +30,20 @@
 _LIBCPP_HIDE_FROM_ABI _RealType
 generate_canonical(_URNG& __g)
 {
-    const size_t _Dt = numeric_limits<_RealType>::digits;
-    const size_t __b = _Dt < __bits ? _Dt : __bits;
+    const size_t __dt = numeric_limits<_RealType>::digits;
+    const size_t __b = __dt < __bits ? __dt : __bits;
 #ifdef _LIBCPP_CXX03_LANG
-    const size_t __logR = __log2<uint64_t, _URNG::_Max - _URNG::_Min + uint64_t(1)>::value;
+    const size_t __log_r = __log2<uint64_t, _URNG::_Max - _URNG::_Min + uint64_t(1)>::value;
 #else
-    const size_t __logR = __log2<uint64_t, _URNG::max() - _URNG::min() + uint64_t(1)>::value;
+    const size_t __log_r = __log2<uint64_t, _URNG::max() - _URNG::min() + uint64_t(1)>::value;
 #endif
-    const size_t __k = __b / __logR + (__b % __logR != 0) + (__b == 0);
-    const _RealType _Rp = static_cast<_RealType>(_URNG::max() - _URNG::min()) + _RealType(1);
-    _RealType __base = _Rp;
-    _RealType _Sp = __g() - _URNG::min();
-    for (size_t __i = 1; __i < __k; ++__i, __base *= _Rp)
-        _Sp += (__g() - _URNG::min()) * __base;
-    return _Sp / __base;
+    const size_t __k = __b / __log_r + (__b % __log_r != 0) + (__b == 0);
+    const _RealType __rp = static_cast<_RealType>(_URNG::max() - _URNG::min()) + _RealType(1);
+    _RealType __base = __rp;
+    _RealType __sp = __g() - _URNG::min();
+    for (size_t __i = 1; __i < __k; ++__i, __base *= __rp)
+        __sp += (__g() - _URNG::min()) * __base;
+    return __sp / __base;
 }
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/__random/independent_bits_engine.h b/third_party/llvm-project/libcxx/include/__random/independent_bits_engine.h
index 151492a..2cd4096 100644
--- a/third_party/llvm-project/libcxx/include/__random/independent_bits_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/independent_bits_engine.h
@@ -12,10 +12,13 @@
 #include <__config>
 #include <__random/is_seed_sequence.h>
 #include <__random/log2.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_convertible.h>
 #include <__utility/move.h>
+#include <cstddef>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -196,7 +199,7 @@
 _UIntType
 independent_bits_engine<_Engine, __w, _UIntType>::__eval(true_type)
 {
-    result_type _Sp = 0;
+    result_type __sp = 0;
     for (size_t __k = 0; __k < __n0; ++__k)
     {
         _Engine_result_type __u;
@@ -204,7 +207,7 @@
         {
             __u = __e_() - _Engine::min();
         } while (__u >= __y0);
-        _Sp = static_cast<result_type>(__lshift<__w0>(_Sp) + (__u & __mask0));
+        __sp = static_cast<result_type>(__lshift<__w0>(__sp) + (__u & __mask0));
     }
     for (size_t __k = __n0; __k < __n; ++__k)
     {
@@ -213,9 +216,9 @@
         {
             __u = __e_() - _Engine::min();
         } while (__u >= __y1);
-        _Sp = static_cast<result_type>(__lshift<__w0+1>(_Sp) + (__u & __mask1));
+        __sp = static_cast<result_type>(__lshift<__w0+1>(__sp) + (__u & __mask1));
     }
-    return _Sp;
+    return __sp;
 }
 
 template<class _Eng, size_t _Wp, class _UInt>
diff --git a/third_party/llvm-project/libcxx/include/__random/is_seed_sequence.h b/third_party/llvm-project/libcxx/include/__random/is_seed_sequence.h
index 3c82b27..06621c3 100644
--- a/third_party/llvm-project/libcxx/include/__random/is_seed_sequence.h
+++ b/third_party/llvm-project/libcxx/include/__random/is_seed_sequence.h
@@ -10,7 +10,9 @@
 #define _LIBCPP___RANDOM_IS_SEED_SEQUENCE_H
 
 #include <__config>
-#include <type_traits>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cv.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/is_valid.h b/third_party/llvm-project/libcxx/include/__random/is_valid.h
index 1d65de0..113452b 100644
--- a/third_party/llvm-project/libcxx/include/__random/is_valid.h
+++ b/third_party/llvm-project/libcxx/include/__random/is_valid.h
@@ -10,8 +10,12 @@
 #define _LIBCPP___RANDOM_IS_VALID_H
 
 #include <__config>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_unsigned.h>
+#include <__utility/declval.h>
 #include <cstdint>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/linear_congruential_engine.h b/third_party/llvm-project/libcxx/include/__random/linear_congruential_engine.h
index 0d91f14..aa24a06 100644
--- a/third_party/llvm-project/libcxx/include/__random/linear_congruential_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/linear_congruential_engine.h
@@ -11,9 +11,11 @@
 
 #include <__config>
 #include <__random/is_seed_sequence.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_unsigned.h>
 #include <cstdint>
 #include <iosfwd>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/log2.h b/third_party/llvm-project/libcxx/include/__random/log2.h
index 72bf075..4ccd1dd 100644
--- a/third_party/llvm-project/libcxx/include/__random/log2.h
+++ b/third_party/llvm-project/libcxx/include/__random/log2.h
@@ -10,8 +10,8 @@
 #define _LIBCPP___RANDOM_LOG2_H
 
 #include <__config>
+#include <__type_traits/conditional.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/mersenne_twister_engine.h b/third_party/llvm-project/libcxx/include/__random/mersenne_twister_engine.h
index 3a58e31..89df825 100644
--- a/third_party/llvm-project/libcxx/include/__random/mersenne_twister_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/mersenne_twister_engine.h
@@ -17,7 +17,6 @@
 #include <cstdint>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -403,9 +402,9 @@
     const size_t __j = (__i_ + 1) % __n;
     const result_type __mask = __r == _Dt ? result_type(~0) :
                                        (result_type(1) << __r) - result_type(1);
-    const result_type _Yp = (__x_[__i_] & ~__mask) | (__x_[__j] & __mask);
+    const result_type __yp = (__x_[__i_] & ~__mask) | (__x_[__j] & __mask);
     const size_t __k = (__i_ + __m) % __n;
-    __x_[__i_] = __x_[__k] ^ __rshift<1>(_Yp) ^ (__a * (_Yp & 1));
+    __x_[__i_] = __x_[__k] ^ __rshift<1>(__yp) ^ (__a * (__yp & 1));
     result_type __z = __x_[__i_] ^ (__rshift<__u>(__x_[__i_]) & __d);
     __i_ = __j;
     __z ^= __lshift<__s>(__z) & __b;
diff --git a/third_party/llvm-project/libcxx/include/__random/normal_distribution.h b/third_party/llvm-project/libcxx/include/__random/normal_distribution.h
index b2ed47e..93f3d1f 100644
--- a/third_party/llvm-project/libcxx/include/__random/normal_distribution.h
+++ b/third_party/llvm-project/libcxx/include/__random/normal_distribution.h
@@ -133,30 +133,30 @@
 normal_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p)
 {
     static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
-    result_type _Up;
+    result_type __up;
     if (__v_hot_)
     {
         __v_hot_ = false;
-        _Up = __v_;
+        __up = __v_;
     }
     else
     {
-        uniform_real_distribution<result_type> _Uni(-1, 1);
+        uniform_real_distribution<result_type> __uni(-1, 1);
         result_type __u;
         result_type __v;
         result_type __s;
         do
         {
-            __u = _Uni(__g);
-            __v = _Uni(__g);
+            __u = __uni(__g);
+            __v = __uni(__g);
             __s = __u * __u + __v * __v;
         } while (__s > 1 || __s == 0);
-        result_type _Fp = _VSTD::sqrt(-2 * _VSTD::log(__s) / __s);
-        __v_ = __v * _Fp;
+        result_type __fp = _VSTD::sqrt(-2 * _VSTD::log(__s) / __s);
+        __v_ = __v * __fp;
         __v_hot_ = true;
-        _Up = __u * _Fp;
+        __up = __u * __fp;
     }
-    return _Up * __p.stddev() + __p.mean();
+    return __up * __p.stddev() + __p.mean();
 }
 
 template <class _CharT, class _Traits, class _RT>
@@ -189,16 +189,16 @@
     __is.flags(_Istream::dec | _Istream::skipws);
     result_type __mean;
     result_type __stddev;
-    result_type _Vp = 0;
-    bool _V_hot = false;
-    __is >> __mean >> __stddev >> _V_hot;
-    if (_V_hot)
-        __is >> _Vp;
+    result_type __vp = 0;
+    bool __v_hot = false;
+    __is >> __mean >> __stddev >> __v_hot;
+    if (__v_hot)
+        __is >> __vp;
     if (!__is.fail())
     {
         __x.param(param_type(__mean, __stddev));
-        __x.__v_hot_ = _V_hot;
-        __x.__v_ = _Vp;
+        __x.__v_hot_ = __v_hot;
+        __x.__v_ = __vp;
     }
     return __is;
 }
diff --git a/third_party/llvm-project/libcxx/include/__random/piecewise_linear_distribution.h b/third_party/llvm-project/libcxx/include/__random/piecewise_linear_distribution.h
index fc2eb47..0430b24 100644
--- a/third_party/llvm-project/libcxx/include/__random/piecewise_linear_distribution.h
+++ b/third_party/llvm-project/libcxx/include/__random/piecewise_linear_distribution.h
@@ -188,23 +188,23 @@
 piecewise_linear_distribution<_RealType>::param_type::__init()
 {
     __areas_.assign(__densities_.size() - 1, result_type());
-    result_type _Sp = 0;
+    result_type __sp = 0;
     for (size_t __i = 0; __i < __areas_.size(); ++__i)
     {
         __areas_[__i] = (__densities_[__i+1] + __densities_[__i]) *
                         (__b_[__i+1] - __b_[__i]) * .5;
-        _Sp += __areas_[__i];
+        __sp += __areas_[__i];
     }
     for (size_t __i = __areas_.size(); __i > 1;)
     {
         --__i;
-        __areas_[__i] = __areas_[__i-1] / _Sp;
+        __areas_[__i] = __areas_[__i-1] / __sp;
     }
     __areas_[0] = 0;
     for (size_t __i = 1; __i < __areas_.size(); ++__i)
         __areas_[__i] += __areas_[__i-1];
     for (size_t __i = 0; __i < __densities_.size(); ++__i)
-        __densities_[__i] /= _Sp;
+        __densities_[__i] /= __sp;
 }
 
 template<class _RealType>
diff --git a/third_party/llvm-project/libcxx/include/__random/poisson_distribution.h b/third_party/llvm-project/libcxx/include/__random/poisson_distribution.h
index 334c610..2b39937 100644
--- a/third_party/llvm-project/libcxx/include/__random/poisson_distribution.h
+++ b/third_party/llvm-project/libcxx/include/__random/poisson_distribution.h
@@ -144,12 +144,12 @@
         __d_ = 6 * __mean_ * __mean_;
         __l_ = _VSTD::trunc(__mean_ - 1.1484);
         __omega_ = .3989423 / __s_;
-        double __b1_ = .4166667E-1 / __mean_;
-        double __b2_ = .3 * __b1_ * __b1_;
-        __c3_ = .1428571 * __b1_ * __b2_;
-        __c2_ = __b2_ - 15. * __c3_;
-        __c1_ = __b1_ - 6. * __b2_ + 45. * __c3_;
-        __c0_ = 1. - __b1_ + 3. * __b2_ - 15. * __c3_;
+        double __b1 = .4166667E-1 / __mean_;
+        double __b2 = .3 * __b1 * __b1;
+        __c3_ = .1428571 * __b1 * __b2;
+        __c2_ = __b2 - 15. * __c3_;
+        __c1_ = __b1 - 6. * __b2 + 45. * __c3_;
+        __c0_ = 1. - __b1 + 3. * __b2 - 15. * __c3_;
         __c_ = .1069 / __mean_;
     }
 }
diff --git a/third_party/llvm-project/libcxx/include/__random/seed_seq.h b/third_party/llvm-project/libcxx/include/__random/seed_seq.h
index 330537f..5c40d15 100644
--- a/third_party/llvm-project/libcxx/include/__random/seed_seq.h
+++ b/third_party/llvm-project/libcxx/include/__random/seed_seq.h
@@ -13,6 +13,7 @@
 #include <__algorithm/fill.h>
 #include <__algorithm/max.h>
 #include <__config>
+#include <cstdint>
 #include <initializer_list>
 #include <vector>
 
diff --git a/third_party/llvm-project/libcxx/include/__random/shuffle_order_engine.h b/third_party/llvm-project/libcxx/include/__random/shuffle_order_engine.h
index 4a27289..e07f230 100644
--- a/third_party/llvm-project/libcxx/include/__random/shuffle_order_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/shuffle_order_engine.h
@@ -12,10 +12,13 @@
 #include <__algorithm/equal.h>
 #include <__config>
 #include <__random/is_seed_sequence.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_convertible.h>
 #include <__utility/move.h>
+#include <cstddef>
 #include <cstdint>
 #include <iosfwd>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -201,10 +204,10 @@
         _LIBCPP_INLINE_VISIBILITY
         result_type __evalf()
         {
-            const double _Fp = __d == 0 ?
+            const double __fp = __d == 0 ?
                 __n / (2. * 0x8000000000000000ull) :
                 __n / (double)__d;
-            const size_t __j = static_cast<size_t>(_Fp * (__y_ - _Min));
+            const size_t __j = static_cast<size_t>(__fp * (__y_ - _Min));
             __y_ = __v_[__j];
             __v_[__j] = __e_();
             return __y_;
@@ -262,16 +265,16 @@
     typedef basic_istream<_CharT, _Traits> _Istream;
     __is.flags(_Istream::dec | _Istream::skipws);
     _Eng __e;
-    result_type _Vp[_Kp+1];
+    result_type __vp[_Kp+1];
     __is >> __e;
     for (size_t __i = 0; __i < _Kp+1; ++__i)
-        __is >> _Vp[__i];
+        __is >> __vp[__i];
     if (!__is.fail())
     {
         __x.__e_ = __e;
         for (size_t __i = 0; __i < _Kp; ++__i)
-            __x.__v_[__i] = _Vp[__i];
-        __x.__y_ = _Vp[_Kp];
+            __x.__v_[__i] = __vp[__i];
+        __x.__y_ = __vp[_Kp];
     }
     return __is;
 }
diff --git a/third_party/llvm-project/libcxx/include/__random/subtract_with_carry_engine.h b/third_party/llvm-project/libcxx/include/__random/subtract_with_carry_engine.h
index b25ca84..9294cc2 100644
--- a/third_party/llvm-project/libcxx/include/__random/subtract_with_carry_engine.h
+++ b/third_party/llvm-project/libcxx/include/__random/subtract_with_carry_engine.h
@@ -18,7 +18,6 @@
 #include <cstdint>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__random/uniform_int_distribution.h b/third_party/llvm-project/libcxx/include/__random/uniform_int_distribution.h
index b7db8a3..5415876 100644
--- a/third_party/llvm-project/libcxx/include/__random/uniform_int_distribution.h
+++ b/third_party/llvm-project/libcxx/include/__random/uniform_int_distribution.h
@@ -9,15 +9,16 @@
 #ifndef _LIBCPP___RANDOM_UNIFORM_INT_DISTRIBUTION_H
 #define _LIBCPP___RANDOM_UNIFORM_INT_DISTRIBUTION_H
 
+#include <__bit/countl.h>
 #include <__config>
 #include <__random/is_valid.h>
 #include <__random/log2.h>
-#include <bit>
+#include <__type_traits/conditional.h>
+#include <__type_traits/make_unsigned.h>
 #include <cstddef>
 #include <cstdint>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -120,8 +121,8 @@
 _UIntType
 __independent_bits_engine<_Engine, _UIntType>::__eval(true_type)
 {
-    const size_t _WRt = numeric_limits<result_type>::digits;
-    result_type _Sp = 0;
+    const size_t __w_rt = numeric_limits<result_type>::digits;
+    result_type __sp = 0;
     for (size_t __k = 0; __k < __n0_; ++__k)
     {
         _Engine_result_type __u;
@@ -129,11 +130,11 @@
         {
             __u = __e_() - _Engine::min();
         } while (__u >= __y0_);
-        if (__w0_ < _WRt)
-            _Sp <<= __w0_;
+        if (__w0_ < __w_rt)
+            __sp <<= __w0_;
         else
-            _Sp = 0;
-        _Sp += __u & __mask0_;
+            __sp = 0;
+        __sp += __u & __mask0_;
     }
     for (size_t __k = __n0_; __k < __n_; ++__k)
     {
@@ -142,13 +143,13 @@
         {
             __u = __e_() - _Engine::min();
         } while (__u >= __y1_);
-        if (__w0_ < _WRt - 1)
-            _Sp <<= __w0_ + 1;
+        if (__w0_ < __w_rt - 1)
+            __sp <<= __w0_ + 1;
         else
-            _Sp = 0;
-        _Sp += __u & __mask1_;
+            __sp = 0;
+        __sp += __u & __mask1_;
     }
-    return _Sp;
+    return __sp;
 }
 
 template<class _IntType = int>
@@ -234,22 +235,22 @@
     static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
     typedef __conditional_t<sizeof(result_type) <= sizeof(uint32_t), uint32_t, __make_unsigned_t<result_type> >
         _UIntType;
-    const _UIntType _Rp = _UIntType(__p.b()) - _UIntType(__p.a()) + _UIntType(1);
-    if (_Rp == 1)
+    const _UIntType __rp = _UIntType(__p.b()) - _UIntType(__p.a()) + _UIntType(1);
+    if (__rp == 1)
         return __p.a();
-    const size_t _Dt = numeric_limits<_UIntType>::digits;
+    const size_t __dt = numeric_limits<_UIntType>::digits;
     typedef __independent_bits_engine<_URNG, _UIntType> _Eng;
-    if (_Rp == 0)
-        return static_cast<result_type>(_Eng(__g, _Dt)());
-    size_t __w = _Dt - std::__countl_zero(_Rp) - 1;
-    if ((_Rp & (numeric_limits<_UIntType>::max() >> (_Dt - __w))) != 0)
+    if (__rp == 0)
+        return static_cast<result_type>(_Eng(__g, __dt)());
+    size_t __w = __dt - std::__countl_zero(__rp) - 1;
+    if ((__rp & (numeric_limits<_UIntType>::max() >> (__dt - __w))) != 0)
         ++__w;
     _Eng __e(__g, __w);
     _UIntType __u;
     do
     {
         __u = __e();
-    } while (__u >= _Rp);
+    } while (__u >= __rp);
     return static_cast<result_type>(__u + __p.a());
 }
 
diff --git a/third_party/llvm-project/libcxx/include/__random/uniform_random_bit_generator.h b/third_party/llvm-project/libcxx/include/__random/uniform_random_bit_generator.h
index 84a30b0..ddb3158 100644
--- a/third_party/llvm-project/libcxx/include/__random/uniform_random_bit_generator.h
+++ b/third_party/llvm-project/libcxx/include/__random/uniform_random_bit_generator.h
@@ -13,7 +13,8 @@
 #include <__concepts/invocable.h>
 #include <__concepts/same_as.h>
 #include <__config>
-#include <type_traits>
+#include <__functional/invoke.h>
+#include <__type_traits/integral_constant.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -24,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [rand.req.urng]
 template<class _Gen>
@@ -36,7 +37,7 @@
     requires bool_constant<(_Gen::min() < _Gen::max())>::value;
   };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__random/uniform_real_distribution.h b/third_party/llvm-project/libcxx/include/__random/uniform_real_distribution.h
index b52b689..dd6d6b3 100644
--- a/third_party/llvm-project/libcxx/include/__random/uniform_real_distribution.h
+++ b/third_party/llvm-project/libcxx/include/__random/uniform_real_distribution.h
@@ -14,7 +14,6 @@
 #include <__random/is_valid.h>
 #include <iosfwd>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__ranges/access.h b/third_party/llvm-project/libcxx/include/__ranges/access.h
index e48a71a..502bd5e 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/access.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/access.h
@@ -29,7 +29,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template <class _Tp>
@@ -223,7 +223,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/all.h b/third_party/llvm-project/libcxx/include/__ranges/all.h
index 511f7b3..ecf908d 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/all.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/all.h
@@ -18,10 +18,10 @@
 #include <__ranges/owning_view.h>
 #include <__ranges/range_adaptor.h>
 #include <__ranges/ref_view.h>
+#include <__type_traits/decay.h>
 #include <__utility/auto_cast.h>
 #include <__utility/declval.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -29,7 +29,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges::views {
 
@@ -77,7 +77,7 @@
 
 } // namespace ranges::views
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/common_view.h b/third_party/llvm-project/libcxx/include/__ranges/common_view.h
index 8d7ae58..8fc68ba 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/common_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/common_view.h
@@ -24,7 +24,6 @@
 #include <__ranges/view_interface.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -32,7 +31,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -130,7 +129,7 @@
 } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/concepts.h b/third_party/llvm-project/libcxx/include/__ranges/concepts.h
index e34c545..b87a714 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/concepts.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/concepts.h
@@ -37,7 +37,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -73,6 +73,9 @@
   template <range _Rp>
   using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>;
 
+  template <range _Rp>
+  using range_common_reference_t = iter_common_reference_t<iterator_t<_Rp>>;
+
   // [range.sized]
   template <class _Tp>
   concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); };
@@ -140,7 +143,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/copyable_box.h b/third_party/llvm-project/libcxx/include/__ranges/copyable_box.h
index fb3d6e4..1973bbf 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/copyable_box.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/copyable_box.h
@@ -18,7 +18,6 @@
 #include <__memory/construct_at.h>
 #include <__utility/move.h>
 #include <optional>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -26,7 +25,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // __copyable_box allows turning a type that is copy-constructible (but maybe not copy-assignable) into
 // a type that is both copy-constructible and copy-assignable. It does that by introducing an empty state
@@ -173,7 +172,7 @@
   };
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/counted.h b/third_party/llvm-project/libcxx/include/__ranges/counted.h
index 138aa0e..882f90b 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/counted.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/counted.h
@@ -19,10 +19,11 @@
 #include <__iterator/iterator_traits.h>
 #include <__memory/pointer_traits.h>
 #include <__ranges/subrange.h>
+#include <__type_traits/decay.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
+#include <cstddef>
 #include <span>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -30,7 +31,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges::views {
 
@@ -75,7 +76,7 @@
 
 } // namespace ranges::views
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/dangling.h b/third_party/llvm-project/libcxx/include/__ranges/dangling.h
index c104534..613084d 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/dangling.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/dangling.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 struct dangling {
@@ -35,7 +35,7 @@
 // borrowed_subrange_t defined in <__ranges/subrange.h>
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/data.h b/third_party/llvm-project/libcxx/include/__ranges/data.h
index 0ac25b5..6c09908 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/data.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/data.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.prim.data]
 
@@ -105,7 +105,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/drop_view.h b/third_party/llvm-project/libcxx/include/__ranges/drop_view.h
index 8f3564a..87668c3 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/drop_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/drop_view.h
@@ -33,10 +33,15 @@
 #include <__ranges/size.h>
 #include <__ranges/subrange.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_nothrow_constructible.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/auto_cast.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -47,7 +52,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<view _View>
@@ -69,7 +74,7 @@
     drop_view() requires default_initializable<_View> = default;
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr drop_view(_View __base, range_difference_t<_View> __count)
+    constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 drop_view(_View __base, range_difference_t<_View> __count)
       : __count_(__count)
       , __base_(std::move(__base))
     {
@@ -255,12 +260,12 @@
     {
       // Introducing local variables avoids calculating `min` and `distance` twice (at the cost of diverging from the
       // expression used in the `noexcept` clause and the return statement).
-      auto dist = ranges::distance(__rng);
-      auto clamped = std::min<_Dist>(dist, std::forward<_Np>(__n));
+      auto __dist = ranges::distance(__rng);
+      auto __clamped = std::min<_Dist>(__dist, std::forward<_Np>(__n));
       return          _RawRange(
-                              ranges::begin(__rng) + clamped,
+                              ranges::begin(__rng) + __clamped,
                               ranges::end(__rng),
-                              std::__to_unsigned_like(dist - clamped)
+                              std::__to_unsigned_like(__dist - __clamped)
                               );}
 
   // [range.drop.overview]: the "otherwise" case.
@@ -299,7 +304,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/drop_while_view.h b/third_party/llvm-project/libcxx/include/__ranges/drop_while_view.h
index 7c28992..518feae 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/drop_while_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/drop_while_view.h
@@ -51,7 +51,7 @@
     requires default_initializable<_View> && default_initializable<_Pred>
   = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr drop_while_view(_View __base, _Pred __pred)
+  _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 drop_while_view(_View __base, _Pred __pred)
       : __base_(std::move(__base)), __pred_(std::in_place, std::move(__pred)) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
diff --git a/third_party/llvm-project/libcxx/include/__ranges/elements_view.h b/third_party/llvm-project/libcxx/include/__ranges/elements_view.h
index 3afd6dd..325e4c9 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/elements_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/elements_view.h
@@ -26,9 +26,9 @@
 #include <__ranges/range_adaptor.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_like.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_like.h>
+#include <__tuple/tuple_size.h>
 #include <__type_traits/is_reference.h>
 #include <__type_traits/maybe_const.h>
 #include <__type_traits/remove_cv.h>
@@ -49,12 +49,6 @@
 
 namespace ranges {
 
-template <class _View, size_t _Np, bool _Const>
-class __elements_view_iterator;
-
-template <class _View, size_t _Np, bool _Const>
-class __elements_view_sentinel;
-
 template <class _Tp, size_t _Np>
 concept __has_tuple_element = __tuple_like<_Tp> && _Np < tuple_size<_Tp>::value;
 
@@ -66,6 +60,13 @@
            __has_tuple_element<remove_reference_t<range_reference_t<_View>>, _Np> &&
            __returnable_element<range_reference_t<_View>, _Np>
 class elements_view : public view_interface<elements_view<_View, _Np>> {
+private:
+  template <bool>
+  class __iterator;
+
+  template <bool>
+  class __sentinel;
+
 public:
   _LIBCPP_HIDE_FROM_ABI elements_view()
     requires default_initializable<_View>
@@ -130,12 +131,6 @@
   }
 
 private:
-  template <bool _Const>
-  using __iterator = __elements_view_iterator<_View, _Np, _Const>;
-
-  template <bool _Const>
-  using __sentinel = __elements_view_sentinel<_View, _Np, _Const>;
-
   _LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
 };
 
@@ -160,13 +155,18 @@
   using iterator_category = decltype(__get_iterator_category());
 };
 
-template <class _View, size_t _Np, bool _Const>
-class __elements_view_iterator : public __elements_view_iterator_category_base<__maybe_const<_Const, _View>, _Np> {
-  template <class, size_t, bool >
-  friend class __elements_view_iterator;
+template <input_range _View, size_t _Np>
+  requires view<_View> && __has_tuple_element<range_value_t<_View>, _Np> &&
+           __has_tuple_element<remove_reference_t<range_reference_t<_View>>, _Np> &&
+           __returnable_element<range_reference_t<_View>, _Np>
+template <bool _Const>
+class elements_view<_View, _Np>::__iterator
+    : public __elements_view_iterator_category_base<__maybe_const<_Const, _View>, _Np> {
+  template <bool>
+  friend class __iterator;
 
-  template <class, size_t, bool >
-  friend class __elements_view_sentinel;
+  template <bool>
+  friend class __sentinel;
 
   using _Base = __maybe_const<_Const, _View>;
 
@@ -198,14 +198,13 @@
   using value_type       = remove_cvref_t<tuple_element_t<_Np, range_value_t<_Base>>>;
   using difference_type  = range_difference_t<_Base>;
 
-  _LIBCPP_HIDE_FROM_ABI __elements_view_iterator()
+  _LIBCPP_HIDE_FROM_ABI __iterator()
     requires default_initializable<iterator_t<_Base>>
   = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __elements_view_iterator(iterator_t<_Base> __current)
-      : __current_(std::move(__current)) {}
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __iterator(iterator_t<_Base> __current) : __current_(std::move(__current)) {}
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator(__elements_view_iterator<_View, _Np, !_Const> __i)
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator(__iterator<!_Const> __i)
     requires _Const && convertible_to<iterator_t<_View>, iterator_t<_Base>>
       : __current_(std::move(__i.__current_)) {}
 
@@ -215,44 +214,44 @@
 
   _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator*() const { return __get_element(__current_); }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator& operator++() {
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator++() {
     ++__current_;
     return *this;
   }
 
   _LIBCPP_HIDE_FROM_ABI constexpr void operator++(int) { ++__current_; }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator operator++(int)
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator++(int)
     requires forward_range<_Base>
   {
-    auto temp = *this;
+    auto __temp = *this;
     ++__current_;
-    return temp;
+    return __temp;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator& operator--()
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator--()
     requires bidirectional_range<_Base>
   {
     --__current_;
     return *this;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator operator--(int)
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator--(int)
     requires bidirectional_range<_Base>
   {
-    auto temp = *this;
+    auto __temp = *this;
     --__current_;
-    return temp;
+    return __temp;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator& operator+=(difference_type __n)
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator+=(difference_type __n)
     requires random_access_range<_Base>
   {
     __current_ += __n;
     return *this;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_iterator& operator-=(difference_type __n)
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator-=(difference_type __n)
     requires random_access_range<_Base>
   {
     __current_ -= __n;
@@ -265,99 +264,91 @@
     return __get_element(__current_ + __n);
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __iterator& __y)
     requires equality_comparable<iterator_t<_Base>>
   {
     return __x.__current_ == __y.__current_;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator<(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __x.__current_ < __y.__current_;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator>(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __y < __x;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator<=(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<=(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return !(__y < __x);
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator>=(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>=(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return !(__x < __y);
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr auto
-  operator<=>(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr auto operator<=>(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>>
   {
     return __x.__current_ <=> __y.__current_;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr __elements_view_iterator
-  operator+(const __elements_view_iterator& __x, difference_type __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator+(const __iterator& __x, difference_type __y)
     requires random_access_range<_Base>
   {
-    return __elements_view_iterator{__x} += __y;
+    return __iterator{__x} += __y;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr __elements_view_iterator
-  operator+(difference_type __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator+(difference_type __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __y + __x;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr __elements_view_iterator
-  operator-(const __elements_view_iterator& __x, difference_type __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr __iterator operator-(const __iterator& __x, difference_type __y)
     requires random_access_range<_Base>
   {
-    return __elements_view_iterator{__x} -= __y;
+    return __iterator{__x} -= __y;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr difference_type
-  operator-(const __elements_view_iterator& __x, const __elements_view_iterator& __y)
+  _LIBCPP_HIDE_FROM_ABI friend constexpr difference_type operator-(const __iterator& __x, const __iterator& __y)
     requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>>
   {
     return __x.__current_ - __y.__current_;
   }
 };
 
-template <class _View, size_t _Np, bool _Const>
-class __elements_view_sentinel {
+template <input_range _View, size_t _Np>
+  requires view<_View> && __has_tuple_element<range_value_t<_View>, _Np> &&
+           __has_tuple_element<remove_reference_t<range_reference_t<_View>>, _Np> &&
+           __returnable_element<range_reference_t<_View>, _Np>
+template <bool _Const>
+class elements_view<_View, _Np>::__sentinel {
 private:
   using _Base                                        = __maybe_const<_Const, _View>;
   _LIBCPP_NO_UNIQUE_ADDRESS sentinel_t<_Base> __end_ = sentinel_t<_Base>();
 
-  template <class, size_t, bool >
-  friend class __elements_view_sentinel;
+  template <bool>
+  friend class __sentinel;
 
   template <bool _AnyConst>
-  _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto)
-  __get_current(const __elements_view_iterator<_View, _Np, _AnyConst>& __iter) {
+  _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) __get_current(const __iterator<_AnyConst>& __iter) {
     return (__iter.__current_);
   }
 
 public:
-  _LIBCPP_HIDE_FROM_ABI __elements_view_sentinel() = default;
+  _LIBCPP_HIDE_FROM_ABI __sentinel() = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __elements_view_sentinel(sentinel_t<_Base> __end)
-      : __end_(std::move(__end)) {}
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __sentinel(sentinel_t<_Base> __end) : __end_(std::move(__end)) {}
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __elements_view_sentinel(__elements_view_sentinel<_View, _Np, !_Const> __other)
+  _LIBCPP_HIDE_FROM_ABI constexpr __sentinel(__sentinel<!_Const> __other)
     requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>>
       : __end_(std::move(__other.__end_)) {}
 
@@ -365,22 +356,21 @@
 
   template <bool _OtherConst>
     requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const __elements_view_iterator<_View, _Np, _OtherConst>& __x, const __elements_view_sentinel& __y) {
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
     return __get_current(__x) == __y.__end_;
   }
 
   template <bool _OtherConst>
     requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
-  operator-(const __elements_view_iterator<_View, _Np, _OtherConst>& __x, const __elements_view_sentinel& __y) {
+  operator-(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
     return __get_current(__x) - __y.__end_;
   }
 
   template <bool _OtherConst>
     requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
-  operator-(const __elements_view_sentinel& __x, const __elements_view_iterator<_View, _Np, _OtherConst>& __y) {
+  operator-(const __sentinel& __x, const __iterator<_OtherConst>& __y) {
     return __x.__end_ - __get_current(__y);
   }
 };
diff --git a/third_party/llvm-project/libcxx/include/__ranges/empty.h b/third_party/llvm-project/libcxx/include/__ranges/empty.h
index 8a1c75c..64996f4 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/empty.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/empty.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.prim.empty]
 
@@ -75,7 +75,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/empty_view.h b/third_party/llvm-project/libcxx/include/__ranges/empty_view.h
index 58e69ac..bb445b4 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/empty_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/empty_view.h
@@ -13,7 +13,8 @@
 #include <__config>
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/view_interface.h>
-#include <type_traits>
+#include <__type_traits/is_object.h>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -21,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<class _Tp>
@@ -46,7 +47,7 @@
   } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/enable_borrowed_range.h b/third_party/llvm-project/libcxx/include/__ranges/enable_borrowed_range.h
index 833d266..1d06833 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/enable_borrowed_range.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/enable_borrowed_range.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -33,7 +33,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/enable_view.h b/third_party/llvm-project/libcxx/include/__ranges/enable_view.h
index c85064b..0c1dff3 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/enable_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/enable_view.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -43,7 +43,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/filter_view.h b/third_party/llvm-project/libcxx/include/__ranges/filter_view.h
index f8633a3..28d08c8 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/filter_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/filter_view.h
@@ -35,7 +35,6 @@
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -43,18 +42,9 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
-
-  template <input_range _View, indirect_unary_predicate<iterator_t<_View>> _Pred>
-    requires view<_View> && is_object_v<_Pred>
-  class __filter_view_iterator;
-
-  template <input_range _View, indirect_unary_predicate<iterator_t<_View>> _Pred>
-    requires view<_View> && is_object_v<_Pred>
-  class __filter_view_sentinel;
-
   template<input_range _View, indirect_unary_predicate<iterator_t<_View>> _Pred>
     requires view<_View> && is_object_v<_Pred>
   class filter_view : public view_interface<filter_view<_View, _Pred>> {
@@ -67,20 +57,15 @@
     using _Cache = _If<_UseCache, __non_propagating_cache<iterator_t<_View>>, __empty_cache>;
     _LIBCPP_NO_UNIQUE_ADDRESS _Cache __cached_begin_ = _Cache();
 
-    using __iterator = __filter_view_iterator<_View, _Pred>;
-    using __sentinel = __filter_view_sentinel<_View, _Pred>;
-
-    friend __iterator;
-    friend __sentinel;
+    class __iterator;
+    class __sentinel;
 
   public:
     _LIBCPP_HIDE_FROM_ABI
     filter_view() requires default_initializable<_View> && default_initializable<_Pred> = default;
 
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr filter_view(_View __base, _Pred __pred)
-      : __base_(std::move(__base)), __pred_(in_place, std::move(__pred))
-    { }
+    _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 filter_view(_View __base, _Pred __pred)
+        : __base_(std::move(__base)), __pred_(in_place, std::move(__pred)) {}
 
     template<class _Vp = _View>
     _LIBCPP_HIDE_FROM_ABI
@@ -131,13 +116,11 @@
 
   template<input_range _View, indirect_unary_predicate<iterator_t<_View>> _Pred>
     requires view<_View> && is_object_v<_Pred>
-  class __filter_view_iterator : public __filter_iterator_category<_View> {
-
-    using __filter_view = filter_view<_View, _Pred>;
+  class filter_view<_View, _Pred>::__iterator : public __filter_iterator_category<_View> {
 
   public:
     _LIBCPP_NO_UNIQUE_ADDRESS iterator_t<_View> __current_ = iterator_t<_View>();
-    _LIBCPP_NO_UNIQUE_ADDRESS __filter_view* __parent_ = nullptr;
+    _LIBCPP_NO_UNIQUE_ADDRESS filter_view* __parent_ = nullptr;
 
     using iterator_concept =
       _If<bidirectional_range<_View>, bidirectional_iterator_tag,
@@ -149,10 +132,10 @@
     using difference_type = range_difference_t<_View>;
 
     _LIBCPP_HIDE_FROM_ABI
-    __filter_view_iterator() requires default_initializable<iterator_t<_View>> = default;
+    __iterator() requires default_initializable<iterator_t<_View>> = default;
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __filter_view_iterator(__filter_view& __parent, iterator_t<_View> __current)
+    constexpr __iterator(filter_view& __parent, iterator_t<_View> __current)
       : __current_(std::move(__current)), __parent_(std::addressof(__parent))
     { }
 
@@ -171,7 +154,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __filter_view_iterator& operator++() {
+    constexpr __iterator& operator++() {
       __current_ = ranges::find_if(std::move(++__current_), ranges::end(__parent_->__base_),
                                    std::ref(*__parent_->__pred_));
       return *this;
@@ -179,42 +162,42 @@
     _LIBCPP_HIDE_FROM_ABI
     constexpr void operator++(int) { ++*this; }
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __filter_view_iterator operator++(int) requires forward_range<_View> {
+    constexpr __iterator operator++(int) requires forward_range<_View> {
       auto __tmp = *this;
       ++*this;
       return __tmp;
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __filter_view_iterator& operator--() requires bidirectional_range<_View> {
+    constexpr __iterator& operator--() requires bidirectional_range<_View> {
       do {
         --__current_;
       } while (!std::invoke(*__parent_->__pred_, *__current_));
       return *this;
     }
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __filter_view_iterator operator--(int) requires bidirectional_range<_View> {
-      auto tmp = *this;
+    constexpr __iterator operator--(int) requires bidirectional_range<_View> {
+      auto __tmp = *this;
       --*this;
-      return tmp;
+      return __tmp;
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator==(__filter_view_iterator const& __x, __filter_view_iterator const& __y)
+    friend constexpr bool operator==(__iterator const& __x, __iterator const& __y)
       requires equality_comparable<iterator_t<_View>>
     {
       return __x.__current_ == __y.__current_;
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr range_rvalue_reference_t<_View> iter_move(__filter_view_iterator const& __it)
+    friend constexpr range_rvalue_reference_t<_View> iter_move(__iterator const& __it)
       noexcept(noexcept(ranges::iter_move(__it.__current_)))
     {
       return ranges::iter_move(__it.__current_);
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr void iter_swap(__filter_view_iterator const& __x, __filter_view_iterator const& __y)
+    friend constexpr void iter_swap(__iterator const& __x, __iterator const& __y)
       noexcept(noexcept(ranges::iter_swap(__x.__current_, __y.__current_)))
       requires indirectly_swappable<iterator_t<_View>>
     {
@@ -224,17 +207,15 @@
 
   template<input_range _View, indirect_unary_predicate<iterator_t<_View>> _Pred>
     requires view<_View> && is_object_v<_Pred>
-  class __filter_view_sentinel {
-    using __filter_view = filter_view<_View, _Pred>;
-
+  class filter_view<_View, _Pred>::__sentinel {
   public:
     sentinel_t<_View> __end_ = sentinel_t<_View>();
 
     _LIBCPP_HIDE_FROM_ABI
-    __filter_view_sentinel() = default;
+    __sentinel() = default;
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr explicit __filter_view_sentinel(__filter_view& __parent)
+    constexpr explicit __sentinel(filter_view& __parent)
       : __end_(ranges::end(__parent.__base_))
     { }
 
@@ -242,7 +223,7 @@
     constexpr sentinel_t<_View> base() const { return __end_; }
 
     _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-    operator==(__filter_view_iterator<_View, _Pred> const& __x, __filter_view_sentinel const& __y) {
+    operator==(__iterator const& __x, __sentinel const& __y) {
       return __x.__current_ == __y.__end_;
     }
   };
@@ -273,7 +254,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/iota_view.h b/third_party/llvm-project/libcxx/include/__ranges/iota_view.h
index 3654096..5713942 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/iota_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/iota_view.h
@@ -30,9 +30,12 @@
 #include <__ranges/copyable_box.h>
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_nothrow_copy_constructible.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -40,12 +43,12 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<class _Int>
   struct __get_wider_signed {
-    static auto __call() {
+    consteval static auto __call() {
            if constexpr (sizeof(_Int) < sizeof(short)) return type_identity<short>{};
       else if constexpr (sizeof(_Int) < sizeof(int))   return type_identity<int>{};
       else if constexpr (sizeof(_Int) < sizeof(long))  return type_identity<long>{};
@@ -83,14 +86,6 @@
       { __j - __j } -> convertible_to<_IotaDiffT<_Iter>>;
     };
 
-  template <weakly_incrementable _Start>
-    requires copyable<_Start>
-  struct __iota_view_iterator;
-
-  template <weakly_incrementable _Start, semiregular _BoundSentinel>
-    requires __weakly_equality_comparable_with<_Start, _BoundSentinel> && copyable<_Start>
-  struct __iota_view_sentinel;
-
   template<class>
   struct __iota_iterator_category {};
 
@@ -102,9 +97,211 @@
   template <weakly_incrementable _Start, semiregular _BoundSentinel = unreachable_sentinel_t>
     requires __weakly_equality_comparable_with<_Start, _BoundSentinel> && copyable<_Start>
   class iota_view : public view_interface<iota_view<_Start, _BoundSentinel>> {
+    struct __iterator : public __iota_iterator_category<_Start> {
+      friend class iota_view;
 
-    using __iterator = __iota_view_iterator<_Start>;
-    using __sentinel = __iota_view_sentinel<_Start, _BoundSentinel>;
+      using iterator_concept =
+        _If<__advanceable<_Start>,   random_access_iterator_tag,
+        _If<__decrementable<_Start>, bidirectional_iterator_tag,
+        _If<incrementable<_Start>,   forward_iterator_tag,
+        /*Else*/                     input_iterator_tag>>>;
+
+      using value_type = _Start;
+      using difference_type = _IotaDiffT<_Start>;
+
+      _Start __value_ = _Start();
+
+      _LIBCPP_HIDE_FROM_ABI
+      __iterator() requires default_initializable<_Start> = default;
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr explicit __iterator(_Start __value) : __value_(std::move(__value)) {}
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr _Start operator*() const noexcept(is_nothrow_copy_constructible_v<_Start>) {
+        return __value_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator& operator++() {
+        ++__value_;
+        return *this;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr void operator++(int) { ++*this; }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator operator++(int) requires incrementable<_Start> {
+        auto __tmp = *this;
+        ++*this;
+        return __tmp;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator& operator--() requires __decrementable<_Start> {
+        --__value_;
+        return *this;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator  operator--(int) requires __decrementable<_Start> {
+        auto __tmp = *this;
+        --*this;
+        return __tmp;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator& operator+=(difference_type __n)
+        requires __advanceable<_Start>
+      {
+        if constexpr (__integer_like<_Start> && !__signed_integer_like<_Start>) {
+          if (__n >= difference_type(0)) {
+            __value_ += static_cast<_Start>(__n);
+          } else {
+            __value_ -= static_cast<_Start>(-__n);
+          }
+        } else {
+          __value_ += __n;
+        }
+        return *this;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr __iterator& operator-=(difference_type __n)
+        requires __advanceable<_Start>
+      {
+        if constexpr (__integer_like<_Start> && !__signed_integer_like<_Start>) {
+          if (__n >= difference_type(0)) {
+            __value_ -= static_cast<_Start>(__n);
+          } else {
+            __value_ += static_cast<_Start>(-__n);
+          }
+        } else {
+          __value_ -= __n;
+        }
+        return *this;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      constexpr _Start operator[](difference_type __n) const
+        requires __advanceable<_Start>
+      {
+        return _Start(__value_ + __n);
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator==(const __iterator& __x, const __iterator& __y)
+        requires equality_comparable<_Start>
+      {
+        return __x.__value_ == __y.__value_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator<(const __iterator& __x, const __iterator& __y)
+        requires totally_ordered<_Start>
+      {
+        return __x.__value_ < __y.__value_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator>(const __iterator& __x, const __iterator& __y)
+        requires totally_ordered<_Start>
+      {
+        return __y < __x;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator<=(const __iterator& __x, const __iterator& __y)
+        requires totally_ordered<_Start>
+      {
+        return !(__y < __x);
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator>=(const __iterator& __x, const __iterator& __y)
+        requires totally_ordered<_Start>
+      {
+        return !(__x < __y);
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr auto operator<=>(const __iterator& __x, const __iterator& __y)
+        requires totally_ordered<_Start> && three_way_comparable<_Start>
+      {
+        return __x.__value_ <=> __y.__value_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr __iterator operator+(__iterator __i, difference_type __n)
+        requires __advanceable<_Start>
+      {
+        __i += __n;
+        return __i;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr __iterator operator+(difference_type __n, __iterator __i)
+        requires __advanceable<_Start>
+      {
+        return __i + __n;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr __iterator operator-(__iterator __i, difference_type __n)
+        requires __advanceable<_Start>
+      {
+        __i -= __n;
+        return __i;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr difference_type operator-(const __iterator& __x, const __iterator& __y)
+        requires __advanceable<_Start>
+      {
+        if constexpr (__integer_like<_Start>) {
+          if constexpr (__signed_integer_like<_Start>) {
+            return difference_type(difference_type(__x.__value_) - difference_type(__y.__value_));
+          }
+          if (__y.__value_ > __x.__value_) {
+            return difference_type(-difference_type(__y.__value_ - __x.__value_));
+          }
+          return difference_type(__x.__value_ - __y.__value_);
+        }
+        return __x.__value_ - __y.__value_;
+      }
+    };
+
+    struct __sentinel {
+      friend class iota_view;
+
+    private:
+      _BoundSentinel __bound_sentinel_ = _BoundSentinel();
+
+    public:
+      _LIBCPP_HIDE_FROM_ABI
+      __sentinel() = default;
+      constexpr explicit __sentinel(_BoundSentinel __bound_sentinel) : __bound_sentinel_(std::move(__bound_sentinel)) {}
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr bool operator==(const __iterator& __x, const __sentinel& __y) {
+        return __x.__value_ == __y.__bound_sentinel_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr iter_difference_t<_Start> operator-(const __iterator& __x, const __sentinel& __y)
+        requires sized_sentinel_for<_BoundSentinel, _Start>
+      {
+        return __x.__value_ - __y.__bound_sentinel_;
+      }
+
+      _LIBCPP_HIDE_FROM_ABI
+      friend constexpr iter_difference_t<_Start> operator-(const __sentinel& __x, const __iterator& __y)
+        requires sized_sentinel_for<_BoundSentinel, _Start>
+      {
+        return -(__y - __x);
+      }
+    };
 
     _Start __value_ = _Start();
     _BoundSentinel __bound_sentinel_ = _BoundSentinel();
@@ -117,7 +314,7 @@
     constexpr explicit iota_view(_Start __value) : __value_(std::move(__value)) { }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr iota_view(type_identity_t<_Start> __value, type_identity_t<_BoundSentinel> __bound_sentinel)
+    constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 iota_view(type_identity_t<_Start> __value, type_identity_t<_BoundSentinel> __bound_sentinel)
         : __value_(std::move(__value)), __bound_sentinel_(std::move(__bound_sentinel)) {
       // Validate the precondition if possible.
       if constexpr (totally_ordered_with<_Start, _BoundSentinel>) {
@@ -127,17 +324,17 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr iota_view(__iterator __first, __iterator __last)
+    constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 iota_view(__iterator __first, __iterator __last)
       requires same_as<_Start, _BoundSentinel>
     : iota_view(std::move(__first.__value_), std::move(__last.__value_)) {}
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr iota_view(__iterator __first, _BoundSentinel __last)
+    constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 iota_view(__iterator __first, _BoundSentinel __last)
       requires same_as<_BoundSentinel, unreachable_sentinel_t>
     : iota_view(std::move(__first.__value_), std::move(__last)) {}
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr iota_view(__iterator __first, __sentinel __last)
+    constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 iota_view(__iterator __first, __sentinel __last)
       requires(!same_as<_Start, _BoundSentinel> && !same_as<_Start, unreachable_sentinel_t>)
     : iota_view(std::move(__first.__value_), std::move(__last.__bound_sentinel_)) {}
 
@@ -185,224 +382,6 @@
   template <class _Start, class _BoundSentinel>
   inline constexpr bool enable_borrowed_range<iota_view<_Start, _BoundSentinel>> = true;
 
-  template <weakly_incrementable _Start>
-    requires copyable<_Start>
-  struct __iota_view_iterator : public __iota_iterator_category<_Start> {
-
-    template <weakly_incrementable _StartT, semiregular _BoundSentinelT>
-      requires __weakly_equality_comparable_with<_StartT, _BoundSentinelT> && copyable<_StartT>
-    friend class iota_view;
-
-    using iterator_concept =
-      _If<__advanceable<_Start>,   random_access_iterator_tag,
-      _If<__decrementable<_Start>, bidirectional_iterator_tag,
-      _If<incrementable<_Start>,   forward_iterator_tag,
-      /*Else*/                     input_iterator_tag>>>;
-
-    using value_type = _Start;
-    using difference_type = _IotaDiffT<_Start>;
-
-    _Start __value_ = _Start();
-
-    _LIBCPP_HIDE_FROM_ABI
-    __iota_view_iterator() requires default_initializable<_Start> = default;
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr explicit __iota_view_iterator(_Start __value) : __value_(std::move(__value)) {}
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr _Start operator*() const noexcept(is_nothrow_copy_constructible_v<_Start>) {
-      return __value_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator& operator++() {
-      ++__value_;
-      return *this;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr void operator++(int) { ++*this; }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator operator++(int) requires incrementable<_Start> {
-      auto __tmp = *this;
-      ++*this;
-      return __tmp;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator& operator--() requires __decrementable<_Start> {
-      --__value_;
-      return *this;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator  operator--(int) requires __decrementable<_Start> {
-      auto __tmp = *this;
-      --*this;
-      return __tmp;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator& operator+=(difference_type __n)
-      requires __advanceable<_Start>
-    {
-      if constexpr (__integer_like<_Start> && !__signed_integer_like<_Start>) {
-        if (__n >= difference_type(0)) {
-          __value_ += static_cast<_Start>(__n);
-        } else {
-          __value_ -= static_cast<_Start>(-__n);
-        }
-      } else {
-        __value_ += __n;
-      }
-      return *this;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr __iota_view_iterator& operator-=(difference_type __n)
-      requires __advanceable<_Start>
-    {
-      if constexpr (__integer_like<_Start> && !__signed_integer_like<_Start>) {
-        if (__n >= difference_type(0)) {
-          __value_ -= static_cast<_Start>(__n);
-        } else {
-          __value_ += static_cast<_Start>(-__n);
-        }
-      } else {
-        __value_ -= __n;
-      }
-      return *this;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    constexpr _Start operator[](difference_type __n) const
-      requires __advanceable<_Start>
-    {
-      return _Start(__value_ + __n);
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator==(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires equality_comparable<_Start>
-    {
-      return __x.__value_ == __y.__value_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator<(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires totally_ordered<_Start>
-    {
-      return __x.__value_ < __y.__value_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator>(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires totally_ordered<_Start>
-    {
-      return __y < __x;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator<=(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires totally_ordered<_Start>
-    {
-      return !(__y < __x);
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator>=(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires totally_ordered<_Start>
-    {
-      return !(__x < __y);
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr auto operator<=>(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires totally_ordered<_Start> && three_way_comparable<_Start>
-    {
-      return __x.__value_ <=> __y.__value_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr __iota_view_iterator operator+(__iota_view_iterator __i, difference_type __n)
-      requires __advanceable<_Start>
-    {
-      __i += __n;
-      return __i;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr __iota_view_iterator operator+(difference_type __n, __iota_view_iterator __i)
-      requires __advanceable<_Start>
-    {
-      return __i + __n;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr __iota_view_iterator operator-(__iota_view_iterator __i, difference_type __n)
-      requires __advanceable<_Start>
-    {
-      __i -= __n;
-      return __i;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr difference_type operator-(const __iota_view_iterator& __x, const __iota_view_iterator& __y)
-      requires __advanceable<_Start>
-    {
-      if constexpr (__integer_like<_Start>) {
-        if constexpr (__signed_integer_like<_Start>) {
-          return difference_type(difference_type(__x.__value_) - difference_type(__y.__value_));
-        }
-        if (__y.__value_ > __x.__value_) {
-          return difference_type(-difference_type(__y.__value_ - __x.__value_));
-        }
-        return difference_type(__x.__value_ - __y.__value_);
-      }
-      return __x.__value_ - __y.__value_;
-    }
-  };
-
-  template <weakly_incrementable _Start, semiregular _BoundSentinel>
-    requires __weakly_equality_comparable_with<_Start, _BoundSentinel> && copyable<_Start>
-  struct __iota_view_sentinel {
-
-    template <weakly_incrementable _StartT, semiregular _BoundSentinelT>
-      requires __weakly_equality_comparable_with<_StartT, _BoundSentinelT> && copyable<_StartT>
-    friend class iota_view;
-
-    using __iterator = __iota_view_iterator<_Start>;
-
-  private:
-    _BoundSentinel __bound_sentinel_ = _BoundSentinel();
-
-  public:
-    _LIBCPP_HIDE_FROM_ABI
-    __iota_view_sentinel() = default;
-    constexpr explicit __iota_view_sentinel(_BoundSentinel __bound_sentinel) : __bound_sentinel_(std::move(__bound_sentinel)) {}
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator==(const __iterator& __x, const __iota_view_sentinel& __y) {
-      return __x.__value_ == __y.__bound_sentinel_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr iter_difference_t<_Start> operator-(const __iterator& __x, const __iota_view_sentinel& __y)
-      requires sized_sentinel_for<_BoundSentinel, _Start>
-    {
-      return __x.__value_ - __y.__bound_sentinel_;
-    }
-
-    _LIBCPP_HIDE_FROM_ABI
-    friend constexpr iter_difference_t<_Start> operator-(const __iota_view_sentinel& __x, const __iterator& __y)
-      requires sized_sentinel_for<_BoundSentinel, _Start>
-    {
-      return -(__y - __x);
-    }
-  };
-
  namespace views {
  namespace __iota {
   struct __fn {
@@ -427,7 +406,7 @@
 } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/istream_view.h b/third_party/llvm-project/libcxx/include/__ranges/istream_view.h
index 69a9df3..66cd915 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/istream_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/istream_view.h
@@ -36,18 +36,10 @@
 template <class _Val, class _CharT, class _Traits>
 concept __stream_extractable = requires(basic_istream<_CharT, _Traits>& __is, _Val& __t) { __is >> __t; };
 
-template <movable _Val, class _CharT, class _Traits>
-  requires default_initializable<_Val> && __stream_extractable<_Val, _CharT, _Traits>
-class __basic_istream_view_iterator;
-
 template <movable _Val, class _CharT, class _Traits = char_traits<_CharT>>
   requires default_initializable<_Val> && __stream_extractable<_Val, _CharT, _Traits>
 class basic_istream_view : public view_interface<basic_istream_view<_Val, _CharT, _Traits>> {
-  using __iterator = __basic_istream_view_iterator<_Val, _CharT, _Traits>;
-
-  template <movable _ValueType, class _CharType, class _TraitsType>
-    requires default_initializable<_ValueType> && __stream_extractable<_ValueType, _CharType, _TraitsType>
-  friend class __basic_istream_view_iterator;
+  class __iterator;
 
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr explicit basic_istream_view(basic_istream<_CharT, _Traits>& __stream)
@@ -67,23 +59,23 @@
 
 template <movable _Val, class _CharT, class _Traits>
   requires default_initializable<_Val> && __stream_extractable<_Val, _CharT, _Traits>
-class __basic_istream_view_iterator {
+class basic_istream_view<_Val, _CharT, _Traits>::__iterator {
 public:
   using iterator_concept = input_iterator_tag;
   using difference_type  = ptrdiff_t;
   using value_type       = _Val;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __basic_istream_view_iterator(
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __iterator(
       basic_istream_view<_Val, _CharT, _Traits>& __parent) noexcept
       : __parent_(std::addressof(__parent)) {}
 
-  __basic_istream_view_iterator(const __basic_istream_view_iterator&)                  = delete;
-  _LIBCPP_HIDE_FROM_ABI __basic_istream_view_iterator(__basic_istream_view_iterator&&) = default;
+  __iterator(const __iterator&)                  = delete;
+  _LIBCPP_HIDE_FROM_ABI __iterator(__iterator&&) = default;
 
-  __basic_istream_view_iterator& operator=(const __basic_istream_view_iterator&)                  = delete;
-  _LIBCPP_HIDE_FROM_ABI __basic_istream_view_iterator& operator=(__basic_istream_view_iterator&&) = default;
+  __iterator& operator=(const __iterator&)                  = delete;
+  _LIBCPP_HIDE_FROM_ABI __iterator& operator=(__iterator&&) = default;
 
-  _LIBCPP_HIDE_FROM_ABI __basic_istream_view_iterator& operator++() {
+  _LIBCPP_HIDE_FROM_ABI __iterator& operator++() {
     *__parent_->__stream_ >> __parent_->__value_;
     return *this;
   }
@@ -92,7 +84,7 @@
 
   _LIBCPP_HIDE_FROM_ABI _Val& operator*() const { return __parent_->__value_; }
 
-  _LIBCPP_HIDE_FROM_ABI friend bool operator==(const __basic_istream_view_iterator& __x, default_sentinel_t) {
+  _LIBCPP_HIDE_FROM_ABI friend bool operator==(const __iterator& __x, default_sentinel_t) {
     return !*__x.__get_parent_stream();
   }
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/join_view.h b/third_party/llvm-project/libcxx/include/__ranges/join_view.h
index 869540f..83145ff 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/join_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/join_view.h
@@ -22,6 +22,7 @@
 #include <__iterator/iterator_traits.h>
 #include <__iterator/iterator_with_data.h>
 #include <__iterator/segmented_iterator.h>
+#include <__memory/addressof.h>
 #include <__ranges/access.h>
 #include <__ranges/all.h>
 #include <__ranges/concepts.h>
@@ -32,7 +33,6 @@
 #include <__type_traits/maybe_const.h>
 #include <__utility/forward.h>
 #include <optional>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -40,7 +40,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+// Note: `join_view` is still marked experimental because there is an ABI-breaking change that affects `join_view` in
+// the pipeline (https://isocpp.org/files/papers/D2770R0.html).
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+#if _LIBCPP_STD_VER >= 20 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)
 
 namespace ranges {
   template<class>
@@ -66,14 +69,6 @@
     >;
   };
 
-  template <input_range _View, bool _Const>
-    requires view<_View> && input_range<range_reference_t<_View>>
-  struct __join_view_iterator;
-
-  template <input_range _View, bool _Const>
-    requires view<_View> && input_range<range_reference_t<_View>>
-  struct __join_view_sentinel;
-
   template<input_range _View>
     requires view<_View> && input_range<range_reference_t<_View>>
   class join_view
@@ -81,19 +76,9 @@
   private:
     using _InnerRange = range_reference_t<_View>;
 
-    template<bool _Const>
-    using __iterator = __join_view_iterator<_View, _Const>;
+    template<bool> struct __iterator;
 
-    template<bool _Const>
-    using __sentinel = __join_view_sentinel<_View, _Const>;
-
-    template <input_range _View2, bool _Const2>
-      requires view<_View2> && input_range<range_reference_t<_View2>>
-    friend struct __join_view_iterator;
-
-    template <input_range _View2, bool _Const2>
-      requires view<_View2> && input_range<range_reference_t<_View2>>
-    friend struct __join_view_sentinel;
+    template<bool> struct __sentinel;
 
     template <class>
     friend struct std::__segmented_iterator_traits;
@@ -164,12 +149,12 @@
     }
   };
 
-  template<input_range _View, bool _Const>
+  template<input_range _View>
     requires view<_View> && input_range<range_reference_t<_View>>
-  struct __join_view_sentinel {
-    template<input_range _View2, bool>
-      requires view<_View2> && input_range<range_reference_t<_View2>>
-    friend struct __join_view_sentinel;
+  template<bool _Const>
+  struct join_view<_View>::__sentinel {
+  template<bool>
+    friend struct __sentinel;
 
   private:
     using _Parent = __maybe_const<_Const, join_view<_View>>;
@@ -178,37 +163,42 @@
 
   public:
     _LIBCPP_HIDE_FROM_ABI
-    __join_view_sentinel() = default;
+    __sentinel() = default;
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr explicit __join_view_sentinel(_Parent& __parent)
+    constexpr explicit __sentinel(_Parent& __parent)
       : __end_(ranges::end(__parent.__base_)) {}
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_sentinel(__join_view_sentinel<_View, !_Const> __s)
+    constexpr __sentinel(__sentinel<!_Const> __s)
       requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>>
       : __end_(std::move(__s.__end_)) {}
 
     template<bool _OtherConst>
       requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator==(const __join_view_iterator<_View, _OtherConst>& __x, const __join_view_sentinel& __y) {
+    friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
       return __x.__outer_ == __y.__end_;
     }
   };
 
-  template<input_range _View, bool _Const>
+  // https://reviews.llvm.org/D142811#inline-1383022
+  // To simplify the segmented iterator traits specialization,
+  // make the iterator `final`
+  template<input_range _View>
     requires view<_View> && input_range<range_reference_t<_View>>
-  struct __join_view_iterator
+  template<bool _Const>
+  struct join_view<_View>::__iterator final
     : public __join_view_iterator_category<__maybe_const<_Const, _View>> {
 
-    template<input_range _View2, bool>
-      requires view<_View2> && input_range<range_reference_t<_View2>>
-    friend struct __join_view_iterator;
+    template<bool>
+    friend struct __iterator;
 
     template <class>
     friend struct std::__segmented_iterator_traits;
 
+    static constexpr bool __is_join_view_iterator = true;
+
   private:
     using _Parent = __maybe_const<_Const, join_view<_View>>;
     using _Base = __maybe_const<_Const, _View>;
@@ -243,7 +233,7 @@
         __inner_.reset();
     }
 
-    _LIBCPP_HIDE_FROM_ABI constexpr __join_view_iterator(_Parent* __parent, _Outer __outer, _Inner __inner)
+    _LIBCPP_HIDE_FROM_ABI constexpr __iterator(_Parent* __parent, _Outer __outer, _Inner __inner)
       : __outer_(std::move(__outer)), __inner_(std::move(__inner)), __parent_(__parent) {}
 
   public:
@@ -264,17 +254,17 @@
       range_difference_t<_Base>, range_difference_t<range_reference_t<_Base>>>;
 
     _LIBCPP_HIDE_FROM_ABI
-    __join_view_iterator() requires default_initializable<_Outer> = default;
+    __iterator() requires default_initializable<_Outer> = default;
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator(_Parent& __parent, _Outer __outer)
+    constexpr __iterator(_Parent& __parent, _Outer __outer)
       : __outer_(std::move(__outer))
       , __parent_(std::addressof(__parent)) {
       __satisfy();
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator(__join_view_iterator<_View, !_Const> __i)
+    constexpr __iterator(__iterator<!_Const> __i)
       requires _Const &&
                convertible_to<iterator_t<_View>, _Outer> &&
                convertible_to<iterator_t<_InnerRange>, _Inner>
@@ -295,7 +285,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator& operator++() {
+    constexpr __iterator& operator++() {
       auto&& __inner = [&]() -> auto&& {
         if constexpr (__ref_is_glvalue)
           return *__outer_;
@@ -315,7 +305,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator operator++(int)
+    constexpr __iterator operator++(int)
       requires __ref_is_glvalue &&
                forward_range<_Base> &&
                forward_range<range_reference_t<_Base>>
@@ -326,7 +316,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator& operator--()
+    constexpr __iterator& operator--()
       requires __ref_is_glvalue &&
                bidirectional_range<_Base> &&
                bidirectional_range<range_reference_t<_Base>> &&
@@ -345,7 +335,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    constexpr __join_view_iterator operator--(int)
+    constexpr __iterator operator--(int)
       requires __ref_is_glvalue &&
                bidirectional_range<_Base> &&
                bidirectional_range<range_reference_t<_Base>> &&
@@ -357,7 +347,7 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr bool operator==(const __join_view_iterator& __x, const __join_view_iterator& __y)
+    friend constexpr bool operator==(const __iterator& __x, const __iterator& __y)
       requires __ref_is_glvalue &&
                equality_comparable<iterator_t<_Base>> &&
                equality_comparable<iterator_t<range_reference_t<_Base>>>
@@ -366,14 +356,14 @@
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr decltype(auto) iter_move(const __join_view_iterator& __i)
+    friend constexpr decltype(auto) iter_move(const __iterator& __i)
       noexcept(noexcept(ranges::iter_move(*__i.__inner_)))
     {
       return ranges::iter_move(*__i.__inner_);
     }
 
     _LIBCPP_HIDE_FROM_ABI
-    friend constexpr void iter_swap(const __join_view_iterator& __x, const __join_view_iterator& __y)
+    friend constexpr void iter_swap(const __iterator& __x, const __iterator& __y)
       noexcept(noexcept(ranges::iter_swap(*__x.__inner_, *__y.__inner_)))
       requires indirectly_swappable<_Inner>
     {
@@ -401,12 +391,12 @@
 } // namespace views
 } // namespace ranges
 
-template <class _View, bool _Const>
-  requires(ranges::common_range<typename ranges::__join_view_iterator<_View, _Const>::_Parent> &&
-           __is_cpp17_random_access_iterator<typename ranges::__join_view_iterator<_View, _Const>::_Outer>::value &&
-           __is_cpp17_random_access_iterator<typename ranges::__join_view_iterator<_View, _Const>::_Inner>::value)
-struct __segmented_iterator_traits<ranges::__join_view_iterator<_View, _Const>> {
-  using _JoinViewIterator = ranges::__join_view_iterator<_View, _Const>;
+template <class _JoinViewIterator>
+  requires(_JoinViewIterator::__is_join_view_iterator &&
+           ranges::common_range<typename _JoinViewIterator::_Parent> &&
+           __is_cpp17_random_access_iterator<typename _JoinViewIterator::_Outer>::value &&
+           __is_cpp17_random_access_iterator<typename _JoinViewIterator::_Inner>::value)
+struct __segmented_iterator_traits<_JoinViewIterator> {
 
   using __segment_iterator =
       _LIBCPP_NODEBUG __iterator_with_data<typename _JoinViewIterator::_Outer, typename _JoinViewIterator::_Parent*>;
@@ -445,7 +435,7 @@
   }
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // #if _LIBCPP_STD_VER >= 20 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/lazy_split_view.h b/third_party/llvm-project/libcxx/include/__ranges/lazy_split_view.h
index 3a95075..186a0af 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/lazy_split_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/lazy_split_view.h
@@ -12,6 +12,7 @@
 
 #include <__algorithm/ranges_find.h>
 #include <__algorithm/ranges_mismatch.h>
+#include <__assert>
 #include <__concepts/constructible.h>
 #include <__concepts/convertible_to.h>
 #include <__concepts/derived_from.h>
@@ -34,10 +35,13 @@
 #include <__ranges/single_view.h>
 #include <__ranges/subrange.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_nothrow_constructible.h>
 #include <__type_traits/maybe_const.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -45,7 +49,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -78,14 +82,14 @@
     requires default_initializable<_View> && default_initializable<_Pattern> = default;
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr lazy_split_view(_View __base, _Pattern __pattern)
+  constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 lazy_split_view(_View __base, _Pattern __pattern)
     : __base_(std::move(__base)), __pattern_(std::move(__pattern)) {}
 
   template <input_range _Range>
     requires constructible_from<_View, views::all_t<_Range>> &&
              constructible_from<_Pattern, single_view<range_value_t<_Range>>>
   _LIBCPP_HIDE_FROM_ABI
-  constexpr lazy_split_view(_Range&& __r, range_value_t<_Range> __e)
+  constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 lazy_split_view(_Range&& __r, range_value_t<_Range> __e)
     : __base_(views::all(std::forward<_Range>(__r)))
     , __pattern_(views::single(std::move(__e))) {}
 
@@ -458,7 +462,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/non_propagating_cache.h b/third_party/llvm-project/libcxx/include/__ranges/non_propagating_cache.h
index d50c577..2e6e72f 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/non_propagating_cache.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/non_propagating_cache.h
@@ -16,7 +16,6 @@
 #include <__memory/addressof.h>
 #include <__utility/forward.h>
 #include <optional>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -24,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   // __non_propagating_cache is a helper type that allows storing an optional value in it,
@@ -107,7 +106,7 @@
   struct __empty_cache { };
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/owning_view.h b/third_party/llvm-project/libcxx/include/__ranges/owning_view.h
index e150f6d..cb1d0d5 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/owning_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/owning_view.h
@@ -20,8 +20,8 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -29,7 +29,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<range _Rp>
@@ -76,7 +76,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/range_adaptor.h b/third_party/llvm-project/libcxx/include/__ranges/range_adaptor.h
index 37e4817..f8fd2f6 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/range_adaptor.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/range_adaptor.h
@@ -20,7 +20,6 @@
 #include <__ranges/concepts.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -28,7 +27,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // CRTP base that one can derive from in order to be considered a range adaptor closure
 // by the library. When deriving from this class, a pipe operator will be provided to
@@ -70,7 +69,7 @@
     { return __range_adaptor_closure_t(std::__compose(std::forward<_OtherClosure>(__c2), std::forward<_Closure>(__c1))); }
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/rbegin.h b/third_party/llvm-project/libcxx/include/__ranges/rbegin.h
index 26b4732..1ceb111 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/rbegin.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/rbegin.h
@@ -17,8 +17,11 @@
 #include <__iterator/readable_traits.h>
 #include <__iterator/reverse_iterator.h>
 #include <__ranges/access.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/auto_cast.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -26,7 +29,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [ranges.access.rbegin]
 
@@ -124,7 +127,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/ref_view.h b/third_party/llvm-project/libcxx/include/__ranges/ref_view.h
index 1e5f746..be32b81 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/ref_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/ref_view.h
@@ -24,8 +24,9 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/is_object.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -33,7 +34,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<range _Range>
@@ -81,7 +82,7 @@
   inline constexpr bool enable_borrowed_range<ref_view<_Tp>> = true;
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/rend.h b/third_party/llvm-project/libcxx/include/__ranges/rend.h
index d2987e9..7ee574c 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/rend.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/rend.h
@@ -18,8 +18,11 @@
 #include <__iterator/reverse_iterator.h>
 #include <__ranges/access.h>
 #include <__ranges/rbegin.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/auto_cast.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -27,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // [range.access.rend]
 
@@ -128,7 +131,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/reverse_view.h b/third_party/llvm-project/libcxx/include/__ranges/reverse_view.h
index d7b1378..01d1b97 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/reverse_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/reverse_view.h
@@ -24,9 +24,10 @@
 #include <__ranges/size.h>
 #include <__ranges/subrange.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -34,7 +35,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<view _View>
@@ -184,7 +185,7 @@
   } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/single_view.h b/third_party/llvm-project/libcxx/include/__ranges/single_view.h
index 5c4b918..ccab2c1 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/single_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/single_view.h
@@ -15,10 +15,12 @@
 #include <__ranges/copyable_box.h>
 #include <__ranges/range_adaptor.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_object.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -26,7 +28,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<copy_constructible _Tp>
@@ -95,7 +97,7 @@
 } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/size.h b/third_party/llvm-project/libcxx/include/__ranges/size.h
index 0ac8d63..f22dd1f 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/size.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/size.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<class>
@@ -141,7 +141,7 @@
 } // namespace __cpo
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/split_view.h b/third_party/llvm-project/libcxx/include/__ranges/split_view.h
index 9758ee9..a27ac4e 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/split_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/split_view.h
@@ -42,12 +42,6 @@
 
 namespace ranges {
 
-template <class _View, class _Pattern>
-struct __split_view_iterator;
-
-template <class _View, class _Pattern>
-struct __split_view_sentinel;
-
 template <forward_range _View, forward_range _Pattern>
   requires view<_View> && view<_Pattern> &&
            indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
@@ -59,13 +53,13 @@
   _Cache __cached_begin_                        = _Cache();
 
   template <class, class>
-  friend struct __split_view_iterator;
+  friend struct __iterator;
 
   template <class, class>
-  friend struct __split_view_sentinel;
+  friend struct __sentinel;
 
-  using __iterator = __split_view_iterator<_View, _Pattern>;
-  using __sentinel = __split_view_sentinel<_View, _Pattern>;
+  struct __iterator;
+  struct __sentinel;
 
   _LIBCPP_HIDE_FROM_ABI constexpr subrange<iterator_t<_View>> __find_next(iterator_t<_View> __it) {
     auto [__begin, __end] = ranges::search(subrange(__it, ranges::end(__base_)), __pattern_);
@@ -81,13 +75,14 @@
     requires default_initializable<_View> && default_initializable<_Pattern>
   = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr split_view(_View __base, _Pattern __pattern)
+  _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 split_view(_View __base, _Pattern __pattern)
       : __base_(std::move(__base)), __pattern_(std::move((__pattern))) {}
 
   template <forward_range _Range>
     requires constructible_from<_View, views::all_t<_Range>> &&
                  constructible_from<_Pattern, single_view<range_value_t<_Range>>>
-  _LIBCPP_HIDE_FROM_ABI constexpr split_view(_Range&& __range, range_value_t<_Range> __elem)
+  _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23
+  split_view(_Range&& __range, range_value_t<_Range> __elem)
       : __base_(views::all(std::forward<_Range>(__range))), __pattern_(views::single(std::move(__elem))) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
@@ -120,16 +115,17 @@
 template <forward_range _Range>
 split_view(_Range&&, range_value_t<_Range>) -> split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>;
 
-template <class _View, class _Pattern>
-struct __split_view_iterator {
+template <forward_range _View, forward_range _Pattern>
+  requires view<_View> && view<_Pattern> &&
+           indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
+struct split_view<_View, _Pattern>::__iterator {
 private:
-  split_view<_View, _Pattern>* __parent_                        = nullptr;
+  split_view* __parent_                                         = nullptr;
   _LIBCPP_NO_UNIQUE_ADDRESS iterator_t<_View> __cur_            = iterator_t<_View>();
   _LIBCPP_NO_UNIQUE_ADDRESS subrange<iterator_t<_View>> __next_ = subrange<iterator_t<_View>>();
   bool __trailing_empty_                                        = false;
 
-  template <class, class>
-  friend struct __split_view_sentinel;
+  friend struct __sentinel;
 
 public:
   using iterator_concept  = forward_iterator_tag;
@@ -137,9 +133,9 @@
   using value_type        = subrange<iterator_t<_View>>;
   using difference_type   = range_difference_t<_View>;
 
-  _LIBCPP_HIDE_FROM_ABI __split_view_iterator() = default;
+  _LIBCPP_HIDE_FROM_ABI __iterator() = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __split_view_iterator(
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator(
       split_view<_View, _Pattern>& __parent, iterator_t<_View> __current, subrange<iterator_t<_View>> __next)
       : __parent_(std::addressof(__parent)), __cur_(std::move(__current)), __next_(std::move(__next)) {}
 
@@ -147,7 +143,7 @@
 
   _LIBCPP_HIDE_FROM_ABI constexpr value_type operator*() const { return {__cur_, __next_.begin()}; }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __split_view_iterator& operator++() {
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator++() {
     __cur_ = __next_.begin();
     if (__cur_ != ranges::end(__parent_->__base_)) {
       __cur_ = __next_.end();
@@ -163,36 +159,35 @@
     return *this;
   }
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __split_view_iterator operator++(int) {
+  _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator++(int) {
     auto __tmp = *this;
     ++*this;
     return __tmp;
   }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const __split_view_iterator& __x, const __split_view_iterator& __y) {
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __iterator& __y) {
     return __x.__cur_ == __y.__cur_ && __x.__trailing_empty_ == __y.__trailing_empty_;
   }
 };
 
-template <class _View, class _Pattern>
-struct __split_view_sentinel {
+template <forward_range _View, forward_range _Pattern>
+  requires view<_View> && view<_Pattern> &&
+           indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
+struct split_view<_View, _Pattern>::__sentinel {
 private:
   _LIBCPP_NO_UNIQUE_ADDRESS sentinel_t<_View> __end_ = sentinel_t<_View>();
 
-  _LIBCPP_HIDE_FROM_ABI static constexpr bool
-  __equals(const __split_view_iterator<_View, _Pattern>& __x, const __split_view_sentinel& __y) {
+  _LIBCPP_HIDE_FROM_ABI static constexpr bool __equals(const __iterator& __x, const __sentinel& __y) {
     return __x.__cur_ == __y.__end_ && !__x.__trailing_empty_;
   }
 
 public:
-  _LIBCPP_HIDE_FROM_ABI __split_view_sentinel() = default;
+  _LIBCPP_HIDE_FROM_ABI __sentinel() = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __split_view_sentinel(split_view<_View, _Pattern>& __parent)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __sentinel(split_view<_View, _Pattern>& __parent)
       : __end_(ranges::end(__parent.__base_)) {}
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const __split_view_iterator<_View, _Pattern>& __x, const __split_view_sentinel& __y) {
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __sentinel& __y) {
     return __equals(__x, __y);
   }
 };
diff --git a/third_party/llvm-project/libcxx/include/__ranges/subrange.h b/third_party/llvm-project/libcxx/include/__ranges/subrange.h
index 2d9e4cc..b41b5db 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/subrange.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/subrange.h
@@ -29,9 +29,9 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
-#include <__tuple_dir/pair_like.h>
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/pair_like.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
 #include <__type_traits/conditional.h>
 #include <__type_traits/decay.h>
 #include <__type_traits/is_pointer.h>
@@ -48,7 +48,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
   template<class _From, class _To>
@@ -284,7 +284,7 @@
   using type = _Sp;
 };
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/take_view.h b/third_party/llvm-project/libcxx/include/__ranges/take_view.h
index bea3862..111e7e5 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/take_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/take_view.h
@@ -34,11 +34,14 @@
 #include <__ranges/size.h>
 #include <__ranges/subrange.h>
 #include <__ranges/view_interface.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_nothrow_constructible.h>
 #include <__type_traits/maybe_const.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/auto_cast.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -49,7 +52,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -64,7 +67,8 @@
   _LIBCPP_HIDE_FROM_ABI
   take_view() requires default_initializable<_View> = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr take_view(_View __base, range_difference_t<_View> __count)
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 take_view(_View __base, range_difference_t<_View> __count)
       : __base_(std::move(__base)), __count_(__count) {
     _LIBCPP_ASSERT(__count >= 0, "count has to be greater than or equal to zero");
   }
@@ -334,7 +338,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/take_while_view.h b/third_party/llvm-project/libcxx/include/__ranges/take_while_view.h
index 59c0a4f..d1f1bfe 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/take_while_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/take_while_view.h
@@ -53,17 +53,11 @@
 concept __take_while_const_is_range =
     range<const _View> && indirect_unary_predicate<const _Pred, iterator_t<const _View>>;
 
-template <class, class, bool>
-class __take_while_view_sentinel;
-
 template <view _View, class _Pred>
   requires input_range<_View> && is_object_v<_Pred> && indirect_unary_predicate<const _Pred, iterator_t<_View>>
 class take_while_view : public view_interface<take_while_view<_View, _Pred>> {
-  template <class, class, bool>
-  friend class __take_while_view_sentinel;
-
-  template <bool _Const>
-  using __sentinel = __take_while_view_sentinel<_View, _Pred, _Const>;
+  template <bool>
+  class __sentinel;
 
   _LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
   _LIBCPP_NO_UNIQUE_ADDRESS __copyable_box<_Pred> __pred_;
@@ -73,7 +67,7 @@
     requires default_initializable<_View> && default_initializable<_Pred>
   = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr take_while_view(_View __base, _Pred __pred)
+  _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 take_while_view(_View __base, _Pred __pred)
       : __base_(std::move(__base)), __pred_(std::in_place, std::move(__pred)) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
@@ -114,37 +108,37 @@
 template <class _Range, class _Pred>
 take_while_view(_Range&&, _Pred) -> take_while_view<views::all_t<_Range>, _Pred>;
 
-template <class _View, class _Pred, bool _Const>
-class __take_while_view_sentinel {
+template <view _View, class _Pred>
+  requires input_range<_View> && is_object_v<_Pred> && indirect_unary_predicate<const _Pred, iterator_t<_View>>
+template <bool _Const>
+class take_while_view<_View, _Pred>::__sentinel {
   using _Base = __maybe_const<_Const, _View>;
 
   sentinel_t<_Base> __end_ = sentinel_t<_Base>();
   const _Pred* __pred_     = nullptr;
 
-  template <class, class, bool>
-  friend class __take_while_view_sentinel;
+  friend class __sentinel<!_Const>;
 
 public:
-  _LIBCPP_HIDE_FROM_ABI __take_while_view_sentinel() = default;
+  _LIBCPP_HIDE_FROM_ABI __sentinel() = default;
 
-  _LIBCPP_HIDE_FROM_ABI constexpr explicit __take_while_view_sentinel(sentinel_t<_Base> __end, const _Pred* __pred)
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit __sentinel(sentinel_t<_Base> __end, const _Pred* __pred)
       : __end_(std::move(__end)), __pred_(__pred) {}
 
-  _LIBCPP_HIDE_FROM_ABI constexpr __take_while_view_sentinel(__take_while_view_sentinel<_View, _Pred, !_Const> __s)
+  _LIBCPP_HIDE_FROM_ABI constexpr __sentinel(__sentinel<!_Const> __s)
     requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>>
       : __end_(std::move(__s.__end_)), __pred_(__s.__pred_) {}
 
   _LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Base> base() const { return __end_; }
 
-  _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const iterator_t<_Base>& __x, const __take_while_view_sentinel& __y) {
+  _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const iterator_t<_Base>& __x, const __sentinel& __y) {
     return __x == __y.__end_ || !std::invoke(*__y.__pred_, *__x);
   }
 
   template <bool _OtherConst = !_Const>
     requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool
-  operator==(const iterator_t<__maybe_const<_OtherConst, _View>>& __x, const __take_while_view_sentinel& __y) {
+  operator==(const iterator_t<__maybe_const<_OtherConst, _View>>& __x, const __sentinel& __y) {
     return __x == __y.__end_ || !std::invoke(*__y.__pred_, *__x);
   }
 };
diff --git a/third_party/llvm-project/libcxx/include/__ranges/transform_view.h b/third_party/llvm-project/libcxx/include/__ranges/transform_view.h
index 66d9e80..14bd400 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/transform_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/transform_view.h
@@ -35,7 +35,6 @@
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -43,7 +42,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -57,31 +56,11 @@
   regular_invocable<_Fn&, range_reference_t<_View>> &&
   __can_reference<invoke_result_t<_Fn&, range_reference_t<_View>>>;
 
-template <input_range _View, copy_constructible _Function, bool _IsConst>
-  requires __transform_view_constraints<_View, _Function>
-class __transform_view_iterator;
-
-template <input_range _View, copy_constructible _Function, bool _IsConst>
-  requires __transform_view_constraints<_View, _Function>
-class __transform_view_sentinel;
-
 template<input_range _View, copy_constructible _Fn>
   requires __transform_view_constraints<_View, _Fn>
 class transform_view : public view_interface<transform_view<_View, _Fn>> {
-
-  template <bool _IsConst>
-  using __iterator = __transform_view_iterator<_View, _Fn, _IsConst>;
-
-  template <bool _IsConst>
-  using __sentinel = __transform_view_sentinel<_View, _Fn, _IsConst>;
-
-  template <input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_iterator;
-
-  template <input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_sentinel;
+  template<bool> class __iterator;
+  template<bool> class __sentinel;
 
   _LIBCPP_NO_UNIQUE_ADDRESS __copyable_box<_Fn> __func_;
   _LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
@@ -92,7 +71,7 @@
     requires default_initializable<_View> && default_initializable<_Fn> = default;
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr transform_view(_View __base, _Fn __func)
+  constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 transform_view(_View __base, _Fn __func)
     : __func_(std::in_place, std::move(__func)), __base_(std::move(__base)) {}
 
   _LIBCPP_HIDE_FROM_ABI
@@ -166,7 +145,7 @@
   using _Cat = typename iterator_traits<iterator_t<_View>>::iterator_category;
 
   using iterator_category = conditional_t<
-    is_lvalue_reference_v<invoke_result_t<_Fn&, range_reference_t<_View>>>,
+    is_reference_v<invoke_result_t<_Fn&, range_reference_t<_View>>>,
     conditional_t<
       derived_from<_Cat, contiguous_iterator_tag>,
       random_access_iterator_tag,
@@ -176,23 +155,22 @@
   >;
 };
 
-template<input_range _View, copy_constructible _Fn, bool _Const>
+template<input_range _View, copy_constructible _Fn>
   requires __transform_view_constraints<_View, _Fn>
-class __transform_view_iterator
+template<bool _Const>
+class transform_view<_View, _Fn>::__iterator
   : public __transform_view_iterator_category_base<_View, _Fn> {
 
-  using _Parent = __maybe_const<_Const, transform_view<_View, _Fn>>;
+  using _Parent = __maybe_const<_Const, transform_view>;
   using _Base = __maybe_const<_Const, _View>;
 
   _Parent *__parent_ = nullptr;
 
-  template<input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_iterator;
+  template<bool>
+  friend class transform_view<_View, _Fn>::__iterator;
 
-  template<input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_sentinel;
+  template<bool>
+  friend class transform_view<_View, _Fn>::__sentinel;
 
 public:
   iterator_t<_Base> __current_ = iterator_t<_Base>();
@@ -202,17 +180,17 @@
   using difference_type = range_difference_t<_Base>;
 
   _LIBCPP_HIDE_FROM_ABI
-  __transform_view_iterator() requires default_initializable<iterator_t<_Base>> = default;
+  __iterator() requires default_initializable<iterator_t<_Base>> = default;
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator(_Parent& __parent, iterator_t<_Base> __current)
+  constexpr __iterator(_Parent& __parent, iterator_t<_Base> __current)
     : __parent_(std::addressof(__parent)), __current_(std::move(__current)) {}
 
-  // Note: `__i` should always be `__transform_view_iterator<false>`, but directly using
-  // `__transform_view_iterator<false>` is ill-formed when `_Const` is false
+  // Note: `__i` should always be `__iterator<false>`, but directly using
+  // `__iterator<false>` is ill-formed when `_Const` is false
   // (see http://wg21.link/class.copy.ctor#5).
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator(__transform_view_iterator<_View, _Fn, !_Const> __i)
+  constexpr __iterator(__iterator<!_Const> __i)
     requires _Const && convertible_to<iterator_t<_View>, iterator_t<_Base>>
     : __parent_(__i.__parent_), __current_(std::move(__i.__current_)) {}
 
@@ -234,7 +212,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator& operator++() {
+  constexpr __iterator& operator++() {
     ++__current_;
     return *this;
   }
@@ -243,7 +221,7 @@
   constexpr void operator++(int) { ++__current_; }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator operator++(int)
+  constexpr __iterator operator++(int)
     requires forward_range<_Base>
   {
     auto __tmp = *this;
@@ -252,7 +230,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator& operator--()
+  constexpr __iterator& operator--()
     requires bidirectional_range<_Base>
   {
     --__current_;
@@ -260,7 +238,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator operator--(int)
+  constexpr __iterator operator--(int)
     requires bidirectional_range<_Base>
   {
     auto __tmp = *this;
@@ -269,7 +247,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator& operator+=(difference_type __n)
+  constexpr __iterator& operator+=(difference_type __n)
     requires random_access_range<_Base>
   {
     __current_ += __n;
@@ -277,7 +255,7 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_iterator& operator-=(difference_type __n)
+  constexpr __iterator& operator-=(difference_type __n)
     requires random_access_range<_Base>
   {
     __current_ -= __n;
@@ -293,77 +271,77 @@
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator==(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr bool operator==(const __iterator& __x, const __iterator& __y)
     requires equality_comparable<iterator_t<_Base>>
   {
     return __x.__current_ == __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator<(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr bool operator<(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __x.__current_ < __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator>(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr bool operator>(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __x.__current_ > __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator<=(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr bool operator<=(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __x.__current_ <= __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator>=(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr bool operator>=(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base>
   {
     return __x.__current_ >= __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr auto operator<=>(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr auto operator<=>(const __iterator& __x, const __iterator& __y)
     requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>>
   {
     return __x.__current_ <=> __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr __transform_view_iterator operator+(__transform_view_iterator __i, difference_type __n)
+  friend constexpr __iterator operator+(__iterator __i, difference_type __n)
     requires random_access_range<_Base>
   {
-    return __transform_view_iterator{*__i.__parent_, __i.__current_ + __n};
+    return __iterator{*__i.__parent_, __i.__current_ + __n};
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr __transform_view_iterator operator+(difference_type __n, __transform_view_iterator __i)
+  friend constexpr __iterator operator+(difference_type __n, __iterator __i)
     requires random_access_range<_Base>
   {
-    return __transform_view_iterator{*__i.__parent_, __i.__current_ + __n};
+    return __iterator{*__i.__parent_, __i.__current_ + __n};
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr __transform_view_iterator operator-(__transform_view_iterator __i, difference_type __n)
+  friend constexpr __iterator operator-(__iterator __i, difference_type __n)
     requires random_access_range<_Base>
   {
-    return __transform_view_iterator{*__i.__parent_, __i.__current_ - __n};
+    return __iterator{*__i.__parent_, __i.__current_ - __n};
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr difference_type operator-(const __transform_view_iterator& __x, const __transform_view_iterator& __y)
+  friend constexpr difference_type operator-(const __iterator& __x, const __iterator& __y)
     requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>>
   {
     return __x.__current_ - __y.__current_;
   }
 
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr decltype(auto) iter_move(const __transform_view_iterator& __i)
+  friend constexpr decltype(auto) iter_move(const __iterator& __i)
     noexcept(noexcept(*__i))
   {
     if constexpr (is_lvalue_reference_v<decltype(*__i)>)
@@ -373,37 +351,33 @@
   }
 };
 
-template<input_range _View, copy_constructible _Fn, bool _Const>
+template<input_range _View, copy_constructible _Fn>
   requires __transform_view_constraints<_View, _Fn>
-class __transform_view_sentinel {
-  using _Parent = __maybe_const<_Const, transform_view<_View, _Fn>>;
+template<bool _Const>
+class transform_view<_View, _Fn>::__sentinel {
+  using _Parent = __maybe_const<_Const, transform_view>;
   using _Base = __maybe_const<_Const, _View>;
 
-  template <bool _IsConst>
-  using __iterator = __transform_view_iterator<_View, _Fn, _IsConst>;
-
   sentinel_t<_Base> __end_ = sentinel_t<_Base>();
 
-  template<input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_iterator;
+  template<bool>
+  friend class transform_view<_View, _Fn>::__iterator;
 
-  template<input_range _ViewType, copy_constructible _FunctionType, bool _IsConst>
-    requires __transform_view_constraints<_ViewType, _FunctionType>
-  friend class __transform_view_sentinel;
+  template<bool>
+  friend class transform_view<_View, _Fn>::__sentinel;
 
 public:
   _LIBCPP_HIDE_FROM_ABI
-  __transform_view_sentinel() = default;
+  __sentinel() = default;
 
   _LIBCPP_HIDE_FROM_ABI
-  constexpr explicit __transform_view_sentinel(sentinel_t<_Base> __end) : __end_(__end) {}
+  constexpr explicit __sentinel(sentinel_t<_Base> __end) : __end_(__end) {}
 
-  // Note: `__i` should always be `__transform_view_sentinel<false>`, but directly using
-  // `__transform_view_sentinel<false>` is ill-formed when `_Const` is false
+  // Note: `__i` should always be `__sentinel<false>`, but directly using
+  // `__sentinel<false>` is ill-formed when `_Const` is false
   // (see http://wg21.link/class.copy.ctor#5).
   _LIBCPP_HIDE_FROM_ABI
-  constexpr __transform_view_sentinel(__transform_view_sentinel<_View, _Fn, !_Const> __i)
+  constexpr __sentinel(__sentinel<!_Const> __i)
     requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>>
     : __end_(std::move(__i.__end_)) {}
 
@@ -413,7 +387,7 @@
   template<bool _OtherConst>
     requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI
-  friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __transform_view_sentinel& __y) {
+  friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
     return __x.__current_ == __y.__end_;
   }
 
@@ -421,7 +395,7 @@
     requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI
   friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
-  operator-(const __iterator<_OtherConst>& __x, const __transform_view_sentinel& __y) {
+  operator-(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
     return __x.__current_ - __y.__end_;
   }
 
@@ -429,7 +403,7 @@
     requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
   _LIBCPP_HIDE_FROM_ABI
   friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
-  operator-(const __transform_view_sentinel& __x, const __iterator<_OtherConst>& __y) {
+  operator-(const __sentinel& __x, const __iterator<_OtherConst>& __y) {
     return __x.__end_ - __y.__current_;
   }
 };
@@ -460,7 +434,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/view_interface.h b/third_party/llvm-project/libcxx/include/__ranges/view_interface.h
index 5581eb9..0a14d0d 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/view_interface.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/view_interface.h
@@ -31,7 +31,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -170,7 +170,7 @@
 
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/views.h b/third_party/llvm-project/libcxx/include/__ranges/views.h
index d40c64a..906c4e4 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/views.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/views.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace ranges {
 
@@ -28,7 +28,7 @@
 
 namespace views = ranges::views;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__ranges/zip_view.h b/third_party/llvm-project/libcxx/include/__ranges/zip_view.h
index 5624726..b2067f6 100644
--- a/third_party/llvm-project/libcxx/include/__ranges/zip_view.h
+++ b/third_party/llvm-project/libcxx/include/__ranges/zip_view.h
@@ -30,11 +30,11 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -45,7 +45,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 namespace ranges {
 
@@ -77,7 +77,9 @@
 template <class _Fun, class _Tuple>
 _LIBCPP_HIDE_FROM_ABI constexpr void __tuple_for_each(_Fun&& __f, _Tuple&& __tuple) {
   std::apply(
-      [&]<class... _Types>(_Types&&... __elements) { (std::invoke(__f, std::forward<_Types>(__elements)), ...); },
+      [&]<class... _Types>(_Types&&... __elements) {
+        (static_cast<void>(std::invoke(__f, std::forward<_Types>(__elements))), ...);
+      },
       std::forward<_Tuple>(__tuple));
 }
 
@@ -503,7 +505,7 @@
 } // namespace views
 } // namespace ranges
 
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__split_buffer b/third_party/llvm-project/libcxx/include/__split_buffer
index 7d0beda..c4f1315 100644
--- a/third_party/llvm-project/libcxx/include/__split_buffer
+++ b/third_party/llvm-project/libcxx/include/__split_buffer
@@ -23,9 +23,18 @@
 #include <__memory/compressed_pair.h>
 #include <__memory/pointer_traits.h>
 #include <__memory/swap_allocator.h>
+#include <__type_traits/add_lvalue_reference.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_nothrow_move_assignable.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_swappable.h>
+#include <__type_traits/is_trivially_destructible.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -44,139 +53,165 @@
 template <class _Tp, class _Allocator = allocator<_Tp> >
 struct __split_buffer
 {
-private:
-    __split_buffer(const __split_buffer&);
-    __split_buffer& operator=(const __split_buffer&);
 public:
-    typedef _Tp                                             value_type;
-    typedef _Allocator                                      allocator_type;
-    typedef __libcpp_remove_reference_t<allocator_type>     __alloc_rr;
-    typedef allocator_traits<__alloc_rr>                    __alloc_traits;
-    typedef value_type&                                     reference;
-    typedef const value_type&                               const_reference;
-    typedef typename __alloc_traits::size_type              size_type;
-    typedef typename __alloc_traits::difference_type        difference_type;
-    typedef typename __alloc_traits::pointer                pointer;
-    typedef typename __alloc_traits::const_pointer          const_pointer;
-    typedef pointer                                         iterator;
-    typedef const_pointer                                   const_iterator;
+  using value_type      = _Tp;
+  using allocator_type  = _Allocator;
+  using __alloc_rr      = __libcpp_remove_reference_t<allocator_type>;
+  using __alloc_traits  = allocator_traits<__alloc_rr>;
+  using reference       = value_type&;
+  using const_reference = const value_type&;
+  using size_type       = typename __alloc_traits::size_type;
+  using difference_type = typename __alloc_traits::difference_type;
+  using pointer         = typename __alloc_traits::pointer;
+  using const_pointer   = typename __alloc_traits::const_pointer;
+  using iterator        = pointer;
+  using const_iterator  = const_pointer;
 
-    pointer                                         __first_;
-    pointer                                         __begin_;
-    pointer                                         __end_;
-    __compressed_pair<pointer, allocator_type> __end_cap_;
+  pointer __first_;
+  pointer __begin_;
+  pointer __end_;
+  __compressed_pair<pointer, allocator_type> __end_cap_;
 
-    typedef __add_lvalue_reference_t<allocator_type> __alloc_ref;
-    typedef __add_lvalue_reference_t<allocator_type> __alloc_const_ref;
+  using __alloc_ref       = __add_lvalue_reference_t<allocator_type>;
+  using __alloc_const_ref = __add_lvalue_reference_t<allocator_type>;
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __alloc_rr&           __alloc() _NOEXCEPT         {return __end_cap_.second();}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const __alloc_rr&     __alloc() const _NOEXCEPT   {return __end_cap_.second();}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pointer&              __end_cap() _NOEXCEPT       {return __end_cap_.first();}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const pointer&        __end_cap() const _NOEXCEPT {return __end_cap_.first();}
+  __split_buffer(const __split_buffer&) = delete;
+  __split_buffer& operator=(const __split_buffer&) = delete;
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    __split_buffer()
-        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    explicit __split_buffer(__alloc_rr& __a);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    explicit __split_buffer(const __alloc_rr& __a);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~__split_buffer();
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer()
+      _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
+      : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __default_init_tag()) {}
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer(__split_buffer&& __c)
-        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer& operator=(__split_buffer&& __c)
-        _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
-                is_nothrow_move_assignable<allocator_type>::value) ||
-               !__alloc_traits::propagate_on_container_move_assignment::value);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit __split_buffer(__alloc_rr& __a)
+      : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a) {}
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI       iterator begin() _NOEXCEPT       {return __begin_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT {return __begin_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI       iterator end() _NOEXCEPT         {return __end_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT   {return __end_;}
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit __split_buffer(const __alloc_rr& __a)
+      : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a) {}
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    void clear() _NOEXCEPT
-        {__destruct_at_end(__begin_);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type size() const {return static_cast<size_type>(__end_ - __begin_);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool empty()     const {return __end_ == __begin_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type capacity() const {return static_cast<size_type>(__end_cap() - __first_);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type __front_spare() const {return static_cast<size_type>(__begin_ - __first_);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type __back_spare() const {return static_cast<size_type>(__end_cap() - __end_);}
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
+  __split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI       reference front()       {return *__begin_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_reference front() const {return *__begin_;}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI       reference back()        {return *(__end_ - 1);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_reference back() const  {return *(__end_ - 1);}
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer(__split_buffer&& __c)
+      _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void reserve(size_type __n);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void shrink_to_fit() _NOEXCEPT;
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_front(const_reference __x);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_back(const_reference __x);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_front(value_type&& __x);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_back(value_type&& __x);
-    template <class... _Args>
-        _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void emplace_back(_Args&&... __args);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void pop_front() {__destruct_at_begin(__begin_+1);}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void pop_back() {__destruct_at_end(__end_-1);}
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer& operator=(__split_buffer&& __c)
+      _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
+                  is_nothrow_move_assignable<allocator_type>::value) ||
+                 !__alloc_traits::propagate_on_container_move_assignment::value);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __construct_at_end(size_type __n);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __construct_at_end(size_type __n, const_reference __x);
-    template <class _InputIter>
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIter>::value>
-        __construct_at_end(_InputIter __first, _InputIter __last);
-    template <class _ForwardIterator>
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value>
-        __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~__split_buffer();
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_begin(pointer __new_begin)
-        {__destruct_at_begin(__new_begin, is_trivially_destructible<value_type>());}
-        _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-        void __destruct_at_begin(pointer __new_begin, false_type);
-        _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-        void __destruct_at_begin(pointer __new_begin, true_type);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __alloc_rr& __alloc() _NOEXCEPT { return __end_cap_.second(); }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const __alloc_rr& __alloc() const _NOEXCEPT {
+    return __end_cap_.second();
+  }
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    void __destruct_at_end(pointer __new_last) _NOEXCEPT
-        {__destruct_at_end(__new_last, false_type());}
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-        void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-        void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pointer& __end_cap() _NOEXCEPT { return __end_cap_.first(); }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const pointer& __end_cap() const _NOEXCEPT {
+    return __end_cap_.first();
+  }
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void swap(__split_buffer& __x)
-        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
-                   __is_nothrow_swappable<__alloc_rr>::value);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI iterator begin() _NOEXCEPT { return __begin_; }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return __begin_; }
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool __invariants() const;
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI iterator end() _NOEXCEPT { return __end_; }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return __end_; }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT { __destruct_at_end(__begin_); }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type size() const {
+    return static_cast<size_type>(__end_ - __begin_);
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool empty() const { return __end_ == __begin_; }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type capacity() const {
+    return static_cast<size_type>(__end_cap() - __first_);
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type __front_spare() const {
+    return static_cast<size_type>(__begin_ - __first_);
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI size_type __back_spare() const {
+    return static_cast<size_type>(__end_cap() - __end_);
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI reference front() { return *__begin_; }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_reference front() const { return *__begin_; }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI reference back() { return *(__end_ - 1); }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI const_reference back() const { return *(__end_ - 1); }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void reserve(size_type __n);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void shrink_to_fit() _NOEXCEPT;
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_front(const_reference __x);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_back(const_reference __x);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_front(value_type&& __x);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void push_back(value_type&& __x);
+
+  template <class... _Args>
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void emplace_back(_Args&&... __args);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void pop_front() { __destruct_at_begin(__begin_ + 1); }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void pop_back() { __destruct_at_end(__end_ - 1); }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __construct_at_end(size_type __n);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __construct_at_end(size_type __n, const_reference __x);
+
+  template <class _InputIter>
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
+      __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIter>::value>
+      __construct_at_end(_InputIter __first, _InputIter __last);
+
+  template <class _ForwardIterator>
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
+      __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value>
+      __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_begin(pointer __new_begin) {
+    __destruct_at_begin(__new_begin, is_trivially_destructible<value_type>());
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_begin(pointer __new_begin, false_type);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_begin(pointer __new_begin, true_type);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_end(pointer __new_last) _NOEXCEPT {
+    __destruct_at_end(__new_last, false_type());
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void swap(__split_buffer& __x)
+      _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || __is_nothrow_swappable<__alloc_rr>::value);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool __invariants() const;
 
 private:
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    void __move_assign_alloc(__split_buffer& __c, true_type)
-        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
-        {
-            __alloc() = _VSTD::move(__c.__alloc());
-        }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __move_assign_alloc(__split_buffer& __c, true_type)
+      _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value) {
+    __alloc() = _VSTD::move(__c.__alloc());
+  }
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    void __move_assign_alloc(__split_buffer&, false_type) _NOEXCEPT
-        {}
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __move_assign_alloc(__split_buffer&, false_type) _NOEXCEPT {}
 
-    struct _ConstructTransaction {
-      _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit _ConstructTransaction(pointer* __p, size_type __n) _NOEXCEPT
-      : __pos_(*__p), __end_(*__p + __n), __dest_(__p) {
-      }
-      _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~_ConstructTransaction() {
-        *__dest_ = __pos_;
-      }
-      pointer __pos_;
-     const pointer __end_;
-    private:
-     pointer *__dest_;
-    };
+  struct _ConstructTransaction {
+    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit _ConstructTransaction(
+        pointer* __p, size_type __n) _NOEXCEPT
+        : __pos_(*__p),
+          __end_(*__p + __n),
+          __dest_(__p) {}
+
+    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~_ConstructTransaction() { *__dest_ = __pos_; }
+
+    pointer __pos_;
+    const pointer __end_;
+
+  private:
+    pointer* __dest_;
+  };
 };
 
 template <class _Tp, class _Allocator>
@@ -330,31 +365,6 @@
 
 template <class _Tp, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
-inline
-__split_buffer<_Tp, _Allocator>::__split_buffer()
-    _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __default_init_tag())
-{
-}
-
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-inline
-__split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
-{
-}
-
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-inline
-__split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
-{
-}
-
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
 __split_buffer<_Tp, _Allocator>::~__split_buffer()
 {
     clear();
@@ -463,10 +473,10 @@
 {
     if (capacity() > size())
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc());
             __t.__construct_at_end(move_iterator<pointer>(__begin_),
                                    move_iterator<pointer>(__end_));
@@ -475,12 +485,12 @@
             _VSTD::swap(__begin_, __t.__begin_);
             _VSTD::swap(__end_, __t.__end_);
             _VSTD::swap(__end_cap(), __t.__end_cap());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
diff --git a/third_party/llvm-project/libcxx/include/__string/char_traits.h b/third_party/llvm-project/libcxx/include/__string/char_traits.h
index 622ee22..9d96242 100644
--- a/third_party/llvm-project/libcxx/include/__string/char_traits.h
+++ b/third_party/llvm-project/libcxx/include/__string/char_traits.h
@@ -18,11 +18,11 @@
 #include <__config>
 #include <__functional/hash.h>
 #include <__iterator/iterator_traits.h>
+#include <__string/constexpr_c_functions.h>
 #include <__type_traits/is_constant_evaluated.h>
 #include <cstddef>
 #include <cstdint>
 #include <cstdio>
-#include <cstring>
 #include <iosfwd>
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -199,7 +199,7 @@
     using off_type            = streamoff;
     using pos_type            = streampos;
     using state_type          = mbstate_t;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using comparison_category = strong_ordering;
 #endif
 
@@ -269,7 +269,7 @@
     using off_type            = streamoff;
     using pos_type            = streampos;
     using state_type          = mbstate_t;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using comparison_category = strong_ordering;
 #endif
 
@@ -339,7 +339,7 @@
     using off_type            = streamoff;
     using pos_type            = u8streampos;
     using state_type          = mbstate_t;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using comparison_category = strong_ordering;
 #endif
 
@@ -427,7 +427,7 @@
     using off_type            = streamoff;
     using pos_type            = u16streampos;
     using state_type          = mbstate_t;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using comparison_category = strong_ordering;
 #endif
 
@@ -521,7 +521,7 @@
     using off_type            = streamoff;
     using pos_type            = u32streampos;
     using state_type          = mbstate_t;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     using comparison_category = strong_ordering;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__string/constexpr_c_functions.h b/third_party/llvm-project/libcxx/include/__string/constexpr_c_functions.h
new file mode 100644
index 0000000..500fa47
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__string/constexpr_c_functions.h
@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___STRING_CONSTEXPR_C_FUNCTIONS_H
+#define _LIBCPP___STRING_CONSTEXPR_C_FUNCTIONS_H
+
+#include <__config>
+#include <__type_traits/is_constant_evaluated.h>
+#include <__type_traits/is_equality_comparable.h>
+#include <__type_traits/is_same.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_strlen(const char* __str) {
+  // GCC currently doesn't support __builtin_strlen for heap-allocated memory during constant evaluation.
+  // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70816
+#ifdef _LIBCPP_COMPILER_GCC
+  if (__libcpp_is_constant_evaluated()) {
+    size_t __i = 0;
+    for (; __str[__i] != '\0'; ++__i)
+      ;
+    return __i;
+  }
+#endif
+  return __builtin_strlen(__str);
+}
+
+template <class _Tp, class _Up>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
+__constexpr_memcmp(const _Tp* __lhs, const _Up* __rhs, size_t __count) {
+  static_assert(__libcpp_is_trivially_equality_comparable<_Tp, _Up>::value,
+                "_Tp and _Up have to be trivially equality comparable");
+
+  if (__libcpp_is_constant_evaluated()) {
+#ifdef _LIBCPP_COMPILER_CLANG_BASED
+    if (sizeof(_Tp) == 1 && !is_same<_Tp, bool>::value)
+      return __builtin_memcmp(__lhs, __rhs, __count);
+#endif
+
+    while (__count != 0) {
+      if (*__lhs < *__rhs)
+        return -1;
+      if (*__rhs < *__lhs)
+        return 1;
+
+      __count -= sizeof(_Tp);
+      ++__lhs;
+      ++__rhs;
+    }
+    return 0;
+  } else {
+    return __builtin_memcmp(__lhs, __rhs, __count);
+  }
+}
+
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const char*
+__constexpr_char_memchr(const char* __str, int __char, size_t __count) {
+#if __has_builtin(__builtin_char_memchr)
+  return __builtin_char_memchr(__str, __char, __count);
+#else
+  if (!__libcpp_is_constant_evaluated())
+    return static_cast<const char*>(__builtin_memchr(__str, __char, __count));
+  for (; __count; --__count) {
+    if (*__str == __char)
+      return __str;
+    ++__str;
+  }
+  return nullptr;
+#endif
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___STRING_CONSTEXPR_C_FUNCTIONS_H
diff --git a/third_party/llvm-project/libcxx/include/__errc b/third_party/llvm-project/libcxx/include/__system_error/errc.h
similarity index 100%
rename from third_party/llvm-project/libcxx/include/__errc
rename to third_party/llvm-project/libcxx/include/__system_error/errc.h
diff --git a/third_party/llvm-project/libcxx/include/__system_error/error_category.h b/third_party/llvm-project/libcxx/include/__system_error/error_category.h
new file mode 100644
index 0000000..5c6bb79
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__system_error/error_category.h
@@ -0,0 +1,75 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H
+#define _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H
+
+#include <__compare/ordering.h>
+#include <__config>
+#include <string>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class _LIBCPP_TYPE_VIS error_condition;
+class _LIBCPP_TYPE_VIS error_code;
+
+class _LIBCPP_HIDDEN __do_message;
+
+class _LIBCPP_TYPE_VIS error_category {
+public:
+  virtual ~error_category() _NOEXCEPT;
+
+#if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS)
+  error_category() noexcept;
+#else
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 error_category() _NOEXCEPT = default;
+#endif
+  error_category(const error_category&)            = delete;
+  error_category& operator=(const error_category&) = delete;
+
+  virtual const char* name() const _NOEXCEPT = 0;
+  virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
+  virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
+  virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
+  virtual string message(int __ev) const = 0;
+
+  _LIBCPP_HIDE_FROM_ABI bool operator==(const error_category& __rhs) const _NOEXCEPT { return this == &__rhs; }
+
+#if _LIBCPP_STD_VER >= 20
+
+  _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_category& __rhs) const noexcept {
+    return compare_three_way()(this, std::addressof(__rhs));
+  }
+
+#else  // _LIBCPP_STD_VER >= 20
+
+  _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_category& __rhs) const _NOEXCEPT { return !(*this == __rhs); }
+
+  _LIBCPP_HIDE_FROM_ABI bool operator<(const error_category& __rhs) const _NOEXCEPT { return this < &__rhs; }
+
+#endif // _LIBCPP_STD_VER >= 20
+
+  friend class _LIBCPP_HIDDEN __do_message;
+};
+
+class _LIBCPP_HIDDEN __do_message : public error_category {
+public:
+  string message(int __ev) const override;
+};
+
+_LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
+_LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H
diff --git a/third_party/llvm-project/libcxx/include/__system_error/error_code.h b/third_party/llvm-project/libcxx/include/__system_error/error_code.h
new file mode 100644
index 0000000..3b19a68
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__system_error/error_code.h
@@ -0,0 +1,145 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H
+#define _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H
+
+#include <__compare/ordering.h>
+#include <__config>
+#include <__functional/hash.h>
+#include <__functional/unary_function.h>
+#include <__system_error/errc.h>
+#include <__system_error/error_category.h>
+#include <__system_error/error_condition.h>
+#include <cstddef>
+#include <string>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_error_code_enum : public false_type {};
+
+#if _LIBCPP_STD_VER >= 17
+template <class _Tp>
+inline constexpr bool is_error_code_enum_v = is_error_code_enum<_Tp>::value;
+#endif
+
+namespace __adl_only {
+// Those cause ADL to trigger but they are not viable candidates,
+// so they are never actually selected.
+void make_error_code() = delete;
+} // namespace __adl_only
+
+class _LIBCPP_TYPE_VIS error_code {
+  int __val_;
+  const error_category* __cat_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
+
+  _LIBCPP_HIDE_FROM_ABI error_code(int __val, const error_category& __cat) _NOEXCEPT : __val_(__val), __cat_(&__cat) {}
+
+  template <class _Ep>
+  _LIBCPP_HIDE_FROM_ABI
+  error_code(_Ep __e, typename enable_if<is_error_code_enum<_Ep>::value>::type* = nullptr) _NOEXCEPT {
+    using __adl_only::make_error_code;
+    *this = make_error_code(__e);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT {
+    __val_ = __val;
+    __cat_ = &__cat;
+  }
+
+  template <class _Ep>
+  _LIBCPP_HIDE_FROM_ABI typename enable_if< is_error_code_enum<_Ep>::value, error_code& >::type
+  operator=(_Ep __e) _NOEXCEPT {
+    using __adl_only::make_error_code;
+    *this = make_error_code(__e);
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT {
+    __val_ = 0;
+    __cat_ = &system_category();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; }
+
+  _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; }
+
+  _LIBCPP_HIDE_FROM_ABI error_condition default_error_condition() const _NOEXCEPT {
+    return __cat_->default_error_condition(__val_);
+  }
+
+  string message() const;
+
+  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; }
+};
+
+inline _LIBCPP_HIDE_FROM_ABI error_code make_error_code(errc __e) _NOEXCEPT {
+  return error_code(static_cast<int>(__e), generic_category());
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_code& __y) _NOEXCEPT {
+  return __x.category() == __y.category() && __x.value() == __y.value();
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT {
+  return __x.category().equivalent(__x.value(), __y) || __y.category().equivalent(__x, __y.value());
+}
+
+#if _LIBCPP_STD_VER <= 17
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT {
+  return __y == __x;
+}
+#endif
+
+#if _LIBCPP_STD_VER <= 17
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT {
+  return !(__x == __y);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT {
+  return !(__x == __y);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT {
+  return !(__x == __y);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_code& __x, const error_code& __y) _NOEXCEPT {
+  return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value());
+}
+
+#else  // _LIBCPP_STD_VER <= 17
+
+inline _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_code& __x, const error_code& __y) noexcept {
+  if (auto __c = __x.category() <=> __y.category(); __c != 0)
+    return __c;
+  return __x.value() <=> __y.value();
+}
+
+#endif // _LIBCPP_STD_VER <= 17
+
+template <>
+struct _LIBCPP_TEMPLATE_VIS hash<error_code> : public __unary_function<error_code, size_t> {
+  _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_code& __ec) const _NOEXCEPT {
+    return static_cast<size_t>(__ec.value());
+  }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H
diff --git a/third_party/llvm-project/libcxx/include/__system_error/error_condition.h b/third_party/llvm-project/libcxx/include/__system_error/error_condition.h
new file mode 100644
index 0000000..cefb499
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__system_error/error_condition.h
@@ -0,0 +1,131 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
+#define _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
+
+#include <__compare/ordering.h>
+#include <__config>
+#include <__functional/unary_function.h>
+#include <__system_error/errc.h>
+#include <__system_error/error_category.h>
+#include <cstddef>
+#include <string>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum : public false_type {};
+
+#if _LIBCPP_STD_VER >= 17
+template <class _Tp>
+inline constexpr bool is_error_condition_enum_v = is_error_condition_enum<_Tp>::value;
+#endif
+
+template <>
+struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc> : true_type {};
+
+#ifdef _LIBCPP_CXX03_LANG
+template <>
+struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx> : true_type {};
+#endif
+
+namespace __adl_only {
+// Those cause ADL to trigger but they are not viable candidates,
+// so they are never actually selected.
+void make_error_condition() = delete;
+} // namespace __adl_only
+
+class _LIBCPP_TYPE_VIS error_condition {
+  int __val_;
+  const error_category* __cat_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}
+
+  _LIBCPP_HIDE_FROM_ABI error_condition(int __val, const error_category& __cat) _NOEXCEPT
+      : __val_(__val),
+        __cat_(&__cat) {}
+
+  template <class _Ep>
+  _LIBCPP_HIDE_FROM_ABI
+  error_condition(_Ep __e, typename enable_if<is_error_condition_enum<_Ep>::value>::type* = nullptr) _NOEXCEPT {
+    using __adl_only::make_error_condition;
+    *this = make_error_condition(__e);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT {
+    __val_ = __val;
+    __cat_ = &__cat;
+  }
+
+  template <class _Ep>
+  _LIBCPP_HIDE_FROM_ABI typename enable_if< is_error_condition_enum<_Ep>::value, error_condition& >::type
+  operator=(_Ep __e) _NOEXCEPT {
+    using __adl_only::make_error_condition;
+    *this = make_error_condition(__e);
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT {
+    __val_ = 0;
+    __cat_ = &generic_category();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; }
+
+  _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; }
+  string message() const;
+
+  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; }
+};
+
+inline _LIBCPP_HIDE_FROM_ABI error_condition make_error_condition(errc __e) _NOEXCEPT {
+  return error_condition(static_cast<int>(__e), generic_category());
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
+  return __x.category() == __y.category() && __x.value() == __y.value();
+}
+
+#if _LIBCPP_STD_VER <= 17
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
+  return !(__x == __y);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
+  return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value());
+}
+
+#else  // _LIBCPP_STD_VER <= 17
+
+inline _LIBCPP_HIDE_FROM_ABI strong_ordering
+operator<=>(const error_condition& __x, const error_condition& __y) noexcept {
+  if (auto __c = __x.category() <=> __y.category(); __c != 0)
+    return __c;
+  return __x.value() <=> __y.value();
+}
+
+#endif // _LIBCPP_STD_VER <= 17
+
+template <>
+struct _LIBCPP_TEMPLATE_VIS hash<error_condition> : public __unary_function<error_condition, size_t> {
+  _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_condition& __ec) const _NOEXCEPT {
+    return static_cast<size_t>(__ec.value());
+  }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
diff --git a/third_party/llvm-project/libcxx/include/__system_error/system_error.h b/third_party/llvm-project/libcxx/include/__system_error/system_error.h
new file mode 100644
index 0000000..d199feb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__system_error/system_error.h
@@ -0,0 +1,48 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
+#define _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
+
+#include <__config>
+#include <__system_error/error_category.h>
+#include <__system_error/error_code.h>
+#include <stdexcept>
+#include <string>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class _LIBCPP_TYPE_VIS system_error : public runtime_error {
+  error_code __ec_;
+
+public:
+  system_error(error_code __ec, const string& __what_arg);
+  system_error(error_code __ec, const char* __what_arg);
+  system_error(error_code __ec);
+  system_error(int __ev, const error_category& __ecat, const string& __what_arg);
+  system_error(int __ev, const error_category& __ecat, const char* __what_arg);
+  system_error(int __ev, const error_category& __ecat);
+  system_error(const system_error&) _NOEXCEPT = default;
+  ~system_error() _NOEXCEPT override;
+
+  _LIBCPP_HIDE_FROM_ABI const error_code& code() const _NOEXCEPT { return __ec_; }
+
+private:
+  static string __init(const error_code&, string);
+};
+
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_system_error(int __ev, const char* __what_arg);
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
diff --git a/third_party/llvm-project/libcxx/include/__threading_support b/third_party/llvm-project/libcxx/include/__threading_support
index dcf2763..08dfd73 100644
--- a/third_party/llvm-project/libcxx/include/__threading_support
+++ b/third_party/llvm-project/libcxx/include/__threading_support
@@ -259,21 +259,21 @@
 
 int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t *__m)
 {
-  pthread_mutexattr_t attr;
-  int __ec = pthread_mutexattr_init(&attr);
+  pthread_mutexattr_t __attr;
+  int __ec = pthread_mutexattr_init(&__attr);
   if (__ec)
     return __ec;
-  __ec = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+  __ec = pthread_mutexattr_settype(&__attr, PTHREAD_MUTEX_RECURSIVE);
   if (__ec) {
-    pthread_mutexattr_destroy(&attr);
+    pthread_mutexattr_destroy(&__attr);
     return __ec;
   }
-  __ec = pthread_mutex_init(__m, &attr);
+  __ec = pthread_mutex_init(__m, &__attr);
   if (__ec) {
-    pthread_mutexattr_destroy(&attr);
+    pthread_mutexattr_destroy(&__attr);
     return __ec;
   }
-  __ec = pthread_mutexattr_destroy(&attr);
+  __ec = pthread_mutexattr_destroy(&__attr);
   if (__ec) {
     pthread_mutex_destroy(__m);
     return __ec;
@@ -380,8 +380,8 @@
 
 __libcpp_thread_id __libcpp_thread_get_current_id()
 {
-  const __libcpp_thread_t thread = pthread_self();
-  return __libcpp_thread_get_id(&thread);
+  const __libcpp_thread_t __current_thread = pthread_self();
+  return __libcpp_thread_get_id(&__current_thread);
 }
 
 __libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t)
@@ -643,6 +643,8 @@
     _LIBCPP_INLINE_VISIBILITY
     __thread_id(__libcpp_thread_id __id) : __id_(__id) {}
 
+    _LIBCPP_HIDE_FROM_ABI friend __libcpp_thread_id __get_underlying_id(const __thread_id __id) { return __id.__id_; }
+
     friend __thread_id this_thread::get_id() _NOEXCEPT;
     friend class _LIBCPP_TYPE_VIS thread;
     friend struct _LIBCPP_TEMPLATE_VIS hash<__thread_id>;
diff --git a/third_party/llvm-project/libcxx/include/__tree b/third_party/llvm-project/libcxx/include/__tree
index f5d9d59..8b2965a 100644
--- a/third_party/llvm-project/libcxx/include/__tree
+++ b/third_party/llvm-project/libcxx/include/__tree
@@ -18,6 +18,7 @@
 #include <__iterator/distance.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/next.h>
+#include <__memory/addressof.h>
 #include <__memory/allocator_traits.h>
 #include <__memory/compressed_pair.h>
 #include <__memory/pointer_traits.h>
@@ -375,7 +376,7 @@
 {
     _LIBCPP_ASSERT(__root != nullptr, "Root node should not be null");
     _LIBCPP_ASSERT(__z != nullptr, "The node to remove should not be null");
-    _LIBCPP_DEBUG_ASSERT(__tree_invariant(__root), "The tree invariants should hold");
+    _LIBCPP_DEBUG_ASSERT(std::__tree_invariant(__root), "The tree invariants should hold");
     // __z will be removed from the tree.  Client still needs to destruct/deallocate it
     // __y is either __z, or if __z has two children, __tree_next(__z).
     // __y will have at most one child.
@@ -818,7 +819,7 @@
     template <class> friend class __map_node_destructor;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _NodeType, class _Alloc>
 struct __generic_container_node_destructor;
 template <class _Tp, class _VoidPtr, class _Alloc>
@@ -849,7 +850,7 @@
     typedef typename _NodeTypes::__node_value_type_pointer pointer;
 
     _LIBCPP_INLINE_VISIBILITY __tree_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     : __ptr_(nullptr)
 #endif
     {}
@@ -922,7 +923,7 @@
     typedef typename _NodeTypes::__const_node_value_type_pointer pointer;
 
     _LIBCPP_INLINE_VISIBILITY __tree_const_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     : __ptr_(nullptr)
 #endif
     {}
@@ -1331,7 +1332,7 @@
     _LIBCPP_INLINE_VISIBILITY iterator
     __remove_node_pointer(__node_pointer) _NOEXCEPT;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     template <class _NodeHandle, class _InsertReturnType>
     _LIBCPP_INLINE_VISIBILITY
     _InsertReturnType __node_handle_insert_unique(_NodeHandle&&);
@@ -2265,7 +2266,7 @@
     return __r;
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Compare, class _Allocator>
 template <class _NodeHandle, class _InsertReturnType>
 _LIBCPP_INLINE_VISIBILITY
@@ -2422,7 +2423,7 @@
     }
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 template <class _Tp, class _Compare, class _Allocator>
 typename __tree<_Tp, _Compare, _Allocator>::iterator
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/apply_cv.h b/third_party/llvm-project/libcxx/include/__tuple/apply_cv.h
similarity index 100%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/apply_cv.h
rename to third_party/llvm-project/libcxx/include/__tuple/apply_cv.h
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/make_tuple_types.h b/third_party/llvm-project/libcxx/include/__tuple/make_tuple_types.h
similarity index 93%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/make_tuple_types.h
rename to third_party/llvm-project/libcxx/include/__tuple/make_tuple_types.h
index 913ff9b..38e2547 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/make_tuple_types.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/make_tuple_types.h
@@ -12,11 +12,11 @@
 #include <__config>
 #include <__fwd/array.h>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/apply_cv.h>
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_indices.h>
-#include <__tuple_dir/tuple_size.h>
-#include <__tuple_dir/tuple_types.h>
+#include <__tuple/apply_cv.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_size.h>
+#include <__tuple/tuple_types.h>
 #include <__type_traits/remove_cv.h>
 #include <__type_traits/remove_reference.h>
 #include <cstddef>
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h b/third_party/llvm-project/libcxx/include/__tuple/pair_like.h
similarity index 92%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h
rename to third_party/llvm-project/libcxx/include/__tuple/pair_like.h
index 87407ad..192682d 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/pair_like.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/pair_like.h
@@ -10,8 +10,8 @@
 #define _LIBCPP___TUPLE_PAIR_LIKE_H
 
 #include <__config>
-#include <__tuple_dir/tuple_like.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/tuple_like.h>
+#include <__tuple/tuple_size.h>
 #include <__type_traits/remove_cvref.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/sfinae_helpers.h b/third_party/llvm-project/libcxx/include/__tuple/sfinae_helpers.h
similarity index 96%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/sfinae_helpers.h
rename to third_party/llvm-project/libcxx/include/__tuple/sfinae_helpers.h
index fcd65a0..589f450 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/sfinae_helpers.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/sfinae_helpers.h
@@ -11,11 +11,11 @@
 
 #include <__config>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/make_tuple_types.h>
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_like_ext.h>
-#include <__tuple_dir/tuple_size.h>
-#include <__tuple_dir/tuple_types.h>
+#include <__tuple/make_tuple_types.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_like_ext.h>
+#include <__tuple/tuple_size.h>
+#include <__tuple/tuple_types.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_assignable.h>
@@ -134,7 +134,7 @@
 };
 #endif // !defined(_LIBCPP_CXX03_LANG)
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <bool _CanCopy, bool _CanMove>
 struct __sfinae_ctor_base {};
@@ -189,7 +189,7 @@
   __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
   __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
 };
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_element.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_element.h
similarity index 96%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_element.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_element.h
index 06f49bf..478dd08 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_element.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/tuple_element.h
@@ -10,8 +10,8 @@
 #define _LIBCPP___TUPLE_TUPLE_ELEMENT_H
 
 #include <__config>
-#include <__tuple_dir/tuple_indices.h>
-#include <__tuple_dir/tuple_types.h>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_types.h>
 #include <__type_traits/add_const.h>
 #include <__type_traits/add_cv.h>
 #include <__type_traits/add_volatile.h>
@@ -81,7 +81,7 @@
     typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <size_t _Ip, class ..._Tp>
 using tuple_element_t _LIBCPP_NODEBUG = typename tuple_element <_Ip, _Tp...>::type;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_indices.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_indices.h
similarity index 100%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_indices.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_indices.h
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_like.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_like.h
similarity index 100%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_like.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_like.h
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_like_ext.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_like_ext.h
similarity index 97%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_like_ext.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_like_ext.h
index bf98696..36f5c48 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_like_ext.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/tuple_like_ext.h
@@ -13,7 +13,7 @@
 #include <__fwd/array.h>
 #include <__fwd/pair.h>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/tuple_types.h>
+#include <__tuple/tuple_types.h>
 #include <__type_traits/integral_constant.h>
 #include <cstddef>
 
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_size.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_size.h
similarity index 98%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_size.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_size.h
index d551b22..26f9d97 100644
--- a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_size.h
+++ b/third_party/llvm-project/libcxx/include/__tuple/tuple_size.h
@@ -11,7 +11,7 @@
 
 #include <__config>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/tuple_types.h>
+#include <__tuple/tuple_types.h>
 #include <__type_traits/is_const.h>
 #include <__type_traits/is_volatile.h>
 #include <cstddef>
diff --git a/third_party/llvm-project/libcxx/include/__tuple_dir/tuple_types.h b/third_party/llvm-project/libcxx/include/__tuple/tuple_types.h
similarity index 100%
rename from third_party/llvm-project/libcxx/include/__tuple_dir/tuple_types.h
rename to third_party/llvm-project/libcxx/include/__tuple/tuple_types.h
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_const.h b/third_party/llvm-project/libcxx/include/__type_traits/add_const.h
index c616a13..44d4058 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_const.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_const.h
@@ -21,7 +21,7 @@
   typedef _LIBCPP_NODEBUG const _Tp type;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using add_const_t = typename add_const<_Tp>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_cv.h b/third_party/llvm-project/libcxx/include/__type_traits/add_cv.h
index 8a85353..ee821b3 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_cv.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_cv.h
@@ -21,7 +21,7 @@
   typedef _LIBCPP_NODEBUG const volatile _Tp type;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h b/third_party/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
index daa5cb9..848cc21 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_lvalue_reference.h
@@ -44,7 +44,7 @@
   using type _LIBCPP_NODEBUG = __add_lvalue_reference_t<_Tp>;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using add_lvalue_reference_t = __add_lvalue_reference_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/add_pointer.h
index 9d0c201..1e74daf 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_pointer.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__add_pointer)
+#if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer)
 
 template <class _Tp>
 using __add_pointer_t = __add_pointer(_Tp);
@@ -39,14 +39,14 @@
 template <class _Tp>
 using __add_pointer_t = typename __add_pointer_impl<_Tp>::type;
 
-#endif // __has_builtin(__add_pointer)
+#endif // !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer)
 
 template <class _Tp>
 struct add_pointer {
   using type _LIBCPP_NODEBUG = __add_pointer_t<_Tp>;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using add_pointer_t = __add_pointer_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h b/third_party/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
index 098e84c..a54aae7 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_rvalue_reference.h
@@ -44,7 +44,7 @@
   using type = __add_rvalue_reference_t<_Tp>;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp>
 using add_rvalue_reference_t = __add_rvalue_reference_t<_Tp>;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/add_volatile.h b/third_party/llvm-project/libcxx/include/__type_traits/add_volatile.h
index 73b1cb8..f4fc42f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/add_volatile.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/add_volatile.h
@@ -21,7 +21,7 @@
   typedef _LIBCPP_NODEBUG volatile _Tp type;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/aligned_storage.h b/third_party/llvm-project/libcxx/include/__type_traits/aligned_storage.h
index c564d58..29938d2 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/aligned_storage.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/aligned_storage.h
@@ -93,7 +93,7 @@
     };
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
   _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
@@ -102,15 +102,13 @@
 
 #endif
 
-#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \
-template <size_t _Len>\
-struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\
-{\
-    struct _ALIGNAS(n) type\
-    {\
-        unsigned char __lx[(_Len + n - 1)/n * n];\
-    };\
-}
+#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n)                                                                      \
+  template <size_t _Len>                                                                                               \
+  struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n> {                                   \
+    struct _ALIGNAS(n) type {                                                                                          \
+      unsigned char __lx[(_Len + n - 1) / n * n];                                                                      \
+    };                                                                                                                 \
+  }
 
 _CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1);
 _CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2);
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/aligned_union.h b/third_party/llvm-project/libcxx/include/__type_traits/aligned_union.h
index 2c64130..dd1515a 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/aligned_union.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/aligned_union.h
@@ -46,7 +46,7 @@
     typedef typename aligned_storage<__len, alignment_value>::type type;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <size_t _Len, class... _Types>
 using aligned_union_t _LIBCPP_DEPRECATED_IN_CXX23 = typename aligned_union<_Len, _Types...>::type;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/alignment_of.h b/third_party/llvm-project/libcxx/include/__type_traits/alignment_of.h
index 45b4cbc..d7851ae 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/alignment_of.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/alignment_of.h
@@ -22,7 +22,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of
     : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr size_t alignment_of_v = _LIBCPP_ALIGNOF(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/common_reference.h b/third_party/llvm-project/libcxx/include/__type_traits/common_reference.h
index f919586..59b3dfb 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/common_reference.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/common_reference.h
@@ -27,7 +27,7 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 // common_reference
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 // Let COND_RES(X, Y) be:
 template <class _Xp, class _Yp>
 using __cond_res =
@@ -181,7 +181,7 @@
 // bullet 5 - Otherwise, there shall be no member `type`.
 template <class...> struct common_reference {};
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/common_type.h b/third_party/llvm-project/libcxx/include/__type_traits/common_type.h
index 6d2df6c..afd766f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/common_type.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/common_type.h
@@ -23,7 +23,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 // Let COND_RES(X, Y) be:
 template <class _Tp, class _Up>
 using __cond_type = decltype(false ? std::declval<_Tp>() : std::declval<_Up>());
@@ -49,9 +49,9 @@
 template <class _Tp, class _Up>
 struct __common_type2_imp<_Tp, _Up, __void_t<decltype(true ? std::declval<_Tp>() : std::declval<_Up>())> >
 {
-  typedef _LIBCPP_NODEBUG typename decay<decltype(
+  typedef _LIBCPP_NODEBUG __decay_t<decltype(
                          true ? std::declval<_Tp>() : std::declval<_Up>()
-                         )>::type type;
+                         )> type;
 };
 
 template <class, class = void>
@@ -109,9 +109,9 @@
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up>
     : conditional<
-        _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value,
+        _IsSame<_Tp, __decay_t<_Tp> >::value && _IsSame<_Up, __decay_t<_Up> >::value,
         __common_type2_imp<_Tp, _Up>,
-        common_type<typename decay<_Tp>::type, typename decay<_Up>::type>
+        common_type<__decay_t<_Tp>, __decay_t<_Up> >
     >::type
 {};
 
@@ -125,7 +125,7 @@
 
 #undef _LIBCPP_OPTIONAL_PACK
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/conditional.h b/third_party/llvm-project/libcxx/include/__type_traits/conditional.h
index 6249812..5b5445a 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/conditional.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/conditional.h
@@ -44,7 +44,7 @@
   using type _LIBCPP_NODEBUG = _Then;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <bool _Bp, class _IfRes, class _ElseRes>
 using conditional_t _LIBCPP_NODEBUG = typename conditional<_Bp, _IfRes, _ElseRes>::type;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/conjunction.h b/third_party/llvm-project/libcxx/include/__type_traits/conjunction.h
index 0d95347..4bfa5a2 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/conjunction.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/conjunction.h
@@ -37,7 +37,7 @@
 template <class... _Pred>
 using _And _LIBCPP_NODEBUG = decltype(std::__and_helper<_Pred...>(0));
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class...>
 struct conjunction : true_type {};
@@ -51,7 +51,7 @@
 template <class... _Args>
 inline constexpr bool conjunction_v = conjunction<_Args...>::value;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/decay.h b/third_party/llvm-project/libcxx/include/__type_traits/decay.h
index f45d33b..a32c140 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/decay.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/decay.h
@@ -27,9 +27,13 @@
 
 #if __has_builtin(__decay)
 template <class _Tp>
+using __decay_t _LIBCPP_NODEBUG = __decay(_Tp);
+
+template <class _Tp>
 struct decay {
-  using type _LIBCPP_NODEBUG = __decay(_Tp);
+  using type _LIBCPP_NODEBUG = __decay_t<_Tp>;
 };
+
 #else
 template <class _Up, bool>
 struct __decay {
@@ -60,10 +64,13 @@
 public:
   typedef _LIBCPP_NODEBUG typename __decay<_Up, __libcpp_is_referenceable<_Up>::value>::type type;
 };
+
+template <class _Tp>
+using __decay_t = typename decay<_Tp>::type;
 #endif // __has_builtin(__decay)
 
-#if _LIBCPP_STD_VER > 11
-template <class _Tp> using decay_t = typename decay<_Tp>::type;
+#if _LIBCPP_STD_VER >= 14
+template <class _Tp> using decay_t = __decay_t<_Tp>;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/disjunction.h b/third_party/llvm-project/libcxx/include/__type_traits/disjunction.h
index 125f168..2c89528 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/disjunction.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/disjunction.h
@@ -43,7 +43,7 @@
 template <class... _Args>
 using _Or _LIBCPP_NODEBUG = typename _OrImpl<sizeof...(_Args) != 0>::template _Result<false_type, _Args...>;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class... _Args>
 struct disjunction : _Or<_Args...> {};
@@ -51,7 +51,7 @@
 template <class... _Args>
 inline constexpr bool disjunction_v = _Or<_Args...>::value;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/enable_if.h b/third_party/llvm-project/libcxx/include/__type_traits/enable_if.h
index c5e8df4..4859981 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/enable_if.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/enable_if.h
@@ -22,7 +22,7 @@
 
 template <bool _Bp, class _Tp = void> using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type;
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/extent.h b/third_party/llvm-project/libcxx/include/__type_traits/extent.h
index 0a4d84e..a031f5e 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/extent.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/extent.h
@@ -25,7 +25,7 @@
 struct _LIBCPP_TEMPLATE_VIS extent
     : integral_constant<size_t, __array_extent(_Tp, _Dim)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, unsigned _Ip = 0>
 inline constexpr size_t extent_v = __array_extent(_Tp, _Ip);
 #endif
@@ -43,7 +43,7 @@
 template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip>
     : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, unsigned _Ip = 0>
 inline constexpr size_t extent_v = extent<_Tp, _Ip>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/has_unique_object_representation.h b/third_party/llvm-project/libcxx/include/__type_traits/has_unique_object_representation.h
index d6f75c9..aa45bbb 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/has_unique_object_representation.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/has_unique_object_representation.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations
     : public integral_constant<bool,
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/has_virtual_destructor.h b/third_party/llvm-project/libcxx/include/__type_traits/has_virtual_destructor.h
index e73a2b2..ae3137e 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/has_virtual_destructor.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/has_virtual_destructor.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor
     : public integral_constant<bool, __has_virtual_destructor(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool has_virtual_destructor_v = __has_virtual_destructor(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/integral_constant.h b/third_party/llvm-project/libcxx/include/__type_traits/integral_constant.h
index 2449d1a..0951ab5 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/integral_constant.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/integral_constant.h
@@ -25,7 +25,7 @@
   typedef integral_constant type;
   _LIBCPP_INLINE_VISIBILITY
   _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
   _LIBCPP_INLINE_VISIBILITY
   constexpr value_type operator ()() const _NOEXCEPT {return value;}
 #endif
@@ -40,7 +40,7 @@
 template <bool _Val>
 using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <bool __b>
 using bool_constant = integral_constant<bool, __b>;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_abstract.h b/third_party/llvm-project/libcxx/include/__type_traits/is_abstract.h
index c74b328..5e886bb 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_abstract.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_abstract.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract
     : public integral_constant<bool, __is_abstract(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_abstract_v = __is_abstract(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_aggregate.h b/third_party/llvm-project/libcxx/include/__type_traits/is_aggregate.h
index ea9de84..3b09420 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_aggregate.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_aggregate.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
 is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {};
@@ -26,7 +26,7 @@
 template <class _Tp>
 inline constexpr bool is_aggregate_v = __is_aggregate(_Tp);
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_arithmetic.h b/third_party/llvm-project/libcxx/include/__type_traits/is_arithmetic.h
index 6d631f4..03218c8 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_arithmetic.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_arithmetic.h
@@ -24,7 +24,7 @@
     : public integral_constant<bool, is_integral<_Tp>::value      ||
                                      is_floating_point<_Tp>::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_array.h b/third_party/llvm-project/libcxx/include/__type_traits/is_array.h
index bc10590..8275176 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_array.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_array.h
@@ -26,7 +26,7 @@
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_array_v = __is_array(_Tp);
 #endif
@@ -40,7 +40,7 @@
 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]>
     : public true_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_array_v = is_array<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_assignable.h
index 13cd682..3ee3e21 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_assignable.h
@@ -21,7 +21,7 @@
 template<class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Arg>
 inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Arg);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_base_of.h b/third_party/llvm-project/libcxx/include/__type_traits/is_base_of.h
index 0e6dec0..3338fff 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_base_of.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_base_of.h
@@ -22,7 +22,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_base_of
     : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Bp, class _Dp>
 inline constexpr bool is_base_of_v = __is_base_of(_Bp, _Dp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_bounded_array.h b/third_party/llvm-project/libcxx/include/__type_traits/is_bounded_array.h
index 27de9df..46da83a 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_bounded_array.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_bounded_array.h
@@ -22,7 +22,7 @@
 template <class>                 struct _LIBCPP_TEMPLATE_VIS __libcpp_is_bounded_array           : false_type {};
 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS __libcpp_is_bounded_array<_Tp[_Np]> : true_type {};
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class>                 struct _LIBCPP_TEMPLATE_VIS is_bounded_array           : false_type {};
 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {};
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_class.h b/third_party/llvm-project/libcxx/include/__type_traits/is_class.h
index 031430f..62bf6d9 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_class.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_class.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class
     : public integral_constant<bool, __is_class(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_class_v = __is_class(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_compound.h b/third_party/llvm-project/libcxx/include/__type_traits/is_compound.h
index 1395ed8..73d830c 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_compound.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_compound.h
@@ -24,7 +24,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_compound_v = __is_compound(_Tp);
 #endif
@@ -34,7 +34,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound
     : public integral_constant<bool, !is_fundamental<_Tp>::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_const.h b/third_party/llvm-project/libcxx/include/__type_traits/is_const.h
index 42b892c..fad3602 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_const.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_const.h
@@ -23,7 +23,7 @@
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_const_v = __is_const(_Tp);
 #endif
@@ -33,7 +33,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const            : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_const_v = is_const<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_constant_evaluated.h b/third_party/llvm-project/libcxx/include/__type_traits/is_constant_evaluated.h
index ae903da..d6278f5 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_constant_evaluated.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_constant_evaluated.h
@@ -17,7 +17,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 _LIBCPP_INLINE_VISIBILITY
 inline constexpr bool is_constant_evaluated() noexcept {
   return __builtin_is_constant_evaluated();
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_constructible.h
index cbe61b4..ebe7bfd 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_constructible.h
@@ -23,7 +23,7 @@
     : public integral_constant<bool, __is_constructible(_Tp, _Args...)>
 { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class ..._Args>
 inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_convertible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_convertible.h
index 5f77fd4..873a64b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_convertible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_convertible.h
@@ -98,7 +98,7 @@
 
 #endif // __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _From, class _To>
 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_copy_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_copy_assignable.h
index b3a965f..245ae4b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_copy_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_copy_assignable.h
@@ -27,7 +27,7 @@
           __is_assignable(__add_lvalue_reference_t<_Tp>,
                           __add_lvalue_reference_t<typename add_const<_Tp>::type>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_copy_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_copy_constructible.h
index 053e159..07e2c93 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_copy_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_copy_constructible.h
@@ -26,7 +26,7 @@
           bool,
           __is_constructible(_Tp, __add_lvalue_reference_t<typename add_const<_Tp>::type>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_default_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_default_constructible.h
index d2180c6..7bc21f5 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_default_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_default_constructible.h
@@ -23,7 +23,7 @@
     : public integral_constant<bool, __is_constructible(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_default_constructible_v = __is_constructible(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_destructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_destructible.h
index 376d74d..d785b4b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_destructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_destructible.h
@@ -27,7 +27,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_destructible_v = __is_destructible(_Tp);
 #endif
@@ -90,7 +90,7 @@
 struct is_destructible<void>
     : public false_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_empty.h b/third_party/llvm-project/libcxx/include/__type_traits/is_empty.h
index 042b4e6..46518e1 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_empty.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_empty.h
@@ -22,7 +22,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_empty
     : public integral_constant<bool, __is_empty(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_empty_v = __is_empty(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_enum.h b/third_party/llvm-project/libcxx/include/__type_traits/is_enum.h
index 4c1db41..7b7221d 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_enum.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_enum.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
     : public integral_constant<bool, __is_enum(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_enum_v = __is_enum(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_equality_comparable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_equality_comparable.h
new file mode 100644
index 0000000..b7a7cd2
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_equality_comparable.h
@@ -0,0 +1,62 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___TYPE_TRAITS_IS_EQUAILITY_COMPARABLE_H
+#define _LIBCPP___TYPE_TRAITS_IS_EQUAILITY_COMPARABLE_H
+
+#include <__config>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_integral.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_void.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/void_t.h>
+#include <__utility/declval.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp, class _Up, class = void>
+struct __is_equality_comparable : false_type {};
+
+template <class _Tp, class _Up>
+struct __is_equality_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() == std::declval<_Up>())> > : true_type {
+};
+
+// A type is_trivially_equality_comparable if the expression `a == b` is equivalent to `std::memcmp(&a, &b, sizeof(T))`
+// (with `a` and `b` being of type `T`). There is no compiler built-in to check this, so we can only do this for known
+// types. In particular, these are the integral types and raw pointers.
+//
+// The following types are not trivially equality comparable:
+// floating-point types: different bit-patterns can compare equal. (e.g 0.0 and -0.0)
+// enums: The user is allowed to specialize operator== for enums
+// pointers that don't have the same type (ignoring cv-qualifiers): pointers to virtual bases are equality comparable,
+//   but don't have the same bit-pattern. An exception to this is comparing to a void-pointer. There the bit-pattern is
+//   always compared.
+
+template <class _Tp, class _Up>
+struct __libcpp_is_trivially_equality_comparable
+    : integral_constant<bool,
+                        __is_equality_comparable<_Tp, _Up>::value && is_integral<_Tp>::value &&
+                            is_same<__remove_cv_t<_Tp>, __remove_cv_t<_Up> >::value> {};
+
+// TODO: Use is_pointer_inverconvertible_base_of
+template <class _Tp, class _Up>
+struct __libcpp_is_trivially_equality_comparable<_Tp*, _Up*>
+    : integral_constant<
+          bool,
+          __is_equality_comparable<_Tp*, _Up*>::value &&
+              (is_same<__remove_cv_t<_Tp>, __remove_cv_t<_Up> >::value || is_void<_Tp>::value || is_void<_Up>::value)> {
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TYPE_TRAITS_IS_EQUAILITY_COMPARABLE_H
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_final.h b/third_party/llvm-project/libcxx/include/__type_traits/is_final.h
index 74ced23..ad03b213 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_final.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_final.h
@@ -21,12 +21,12 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
 __libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS
 is_final : public integral_constant<bool, __is_final(_Tp)> {};
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_final_v = __is_final(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_floating_point.h b/third_party/llvm-project/libcxx/include/__type_traits/is_floating_point.h
index 3928448..2789943 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_floating_point.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_floating_point.h
@@ -27,7 +27,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point
     : public __libcpp_is_floating_point<__remove_cv_t<_Tp> > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_function.h b/third_party/llvm-project/libcxx/include/__type_traits/is_function.h
index 53f34b3..f09f19a 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_function.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_function.h
@@ -33,7 +33,7 @@
 
 #endif // __has_builtin(__is_function)
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_function_v = is_function<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_fundamental.h b/third_party/llvm-project/libcxx/include/__type_traits/is_fundamental.h
index 46f81a1..8a1c814 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_fundamental.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_fundamental.h
@@ -25,7 +25,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_fundamental_v = __is_fundamental(_Tp);
 #endif
@@ -37,7 +37,7 @@
                                      __is_nullptr_t<_Tp>::value ||
                                      is_arithmetic<_Tp>::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_integral.h b/third_party/llvm-project/libcxx/include/__type_traits/is_integral.h
index 4dcc191..c4803cb 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_integral.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_integral.h
@@ -50,7 +50,7 @@
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_integral_v = __is_integral(_Tp);
 #endif
@@ -60,7 +60,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral
     : public _BoolConstant<__libcpp_is_integral<__remove_cv_t<_Tp> >::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_literal_type.h b/third_party/llvm-project/libcxx/include/__type_traits/is_literal_type.h
index be01745..624fa5d 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_literal_type.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_literal_type.h
@@ -23,10 +23,10 @@
     : public integral_constant<bool, __is_literal_type(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 _LIBCPP_DEPRECATED_IN_CXX17 inline constexpr bool is_literal_type_v = __is_literal_type(_Tp);
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_member_function_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/is_member_function_pointer.h
index c28f359..72f84bd 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_member_function_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_member_function_pointer.h
@@ -42,7 +42,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
     : _BoolConstant<__is_member_function_pointer(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_function_pointer_v = __is_member_function_pointer(_Tp);
 #endif
@@ -52,7 +52,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
     : public _BoolConstant< __libcpp_is_member_pointer<__remove_cv_t<_Tp> >::__is_func > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_member_object_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/is_member_object_pointer.h
index 5bab14b..bcdc651 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_member_object_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_member_object_pointer.h
@@ -24,7 +24,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
     : _BoolConstant<__is_member_object_pointer(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_object_pointer_v = __is_member_object_pointer(_Tp);
 #endif
@@ -34,7 +34,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
     : public _BoolConstant< __libcpp_is_member_pointer<__remove_cv_t<_Tp> >::__is_obj >  {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_member_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/is_member_pointer.h
index 904d845..5339fb0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_member_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_member_pointer.h
@@ -24,7 +24,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp);
 #endif
@@ -34,7 +34,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer
  : public _BoolConstant< __libcpp_is_member_pointer<__remove_cv_t<_Tp> >::__is_member > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_move_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_move_assignable.h
index 3c7158b..8c4c820 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_move_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_move_assignable.h
@@ -26,7 +26,7 @@
           bool,
           __is_assignable(__add_lvalue_reference_t<_Tp>, __add_rvalue_reference_t<_Tp>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_move_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_move_constructible.h
index 667d104..d908e49 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_move_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_move_constructible.h
@@ -24,7 +24,7 @@
     : public integral_constant<bool, __is_constructible(_Tp, __add_rvalue_reference_t<_Tp>)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_assignable.h
index 0cd9d5d..4d17b9f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_assignable.h
@@ -22,7 +22,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable
     : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Arg>
 inline constexpr bool is_nothrow_assignable_v = __is_nothrow_assignable(_Tp, _Arg);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_constructible.h
index 8919b79..a967bc8 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_constructible.h
@@ -68,7 +68,7 @@
 #endif // __has_builtin(__is_nothrow_constructible)
 
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class ..._Args>
 inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_convertible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_convertible.h
index a8ca1c4..64f75e1 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_convertible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_convertible.h
@@ -24,13 +24,13 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <typename _Tp>
-static void __test_noexcept(_Tp) noexcept;
+void __test_noexcept(_Tp) noexcept;
 
 template<typename _Fm, typename _To>
-static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(std::declval<_Fm>()))>
+bool_constant<noexcept(_VSTD::__test_noexcept<_To>(std::declval<_Fm>()))>
 __is_nothrow_convertible_test();
 
 template <typename _Fm, typename _To>
@@ -46,7 +46,7 @@
 template <typename _Fm, typename _To>
 inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_assignable.h
index 58f7d97..d11ec1c 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_assignable.h
@@ -28,7 +28,7 @@
               __add_lvalue_reference_t<_Tp>,
               __add_lvalue_reference_t<typename add_const<_Tp>::type>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_copy_assignable_v = is_nothrow_copy_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_constructible.h
index ce17334..de4e272 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_copy_constructible.h
@@ -38,7 +38,7 @@
 
 #endif // _LIBCPP_COMPILER_GCC
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_default_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_default_constructible.h
index 91bffa5..446808f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_default_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_default_constructible.h
@@ -22,7 +22,7 @@
     : public integral_constant<bool, __is_nothrow_constructible(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_default_constructible_v = __is_nothrow_constructible(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_destructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_destructible.h
index 03ebf44..e842465 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_destructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_destructible.h
@@ -79,7 +79,7 @@
 
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_assignable.h
index 18dcc9b..7649a3f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_assignable.h
@@ -27,7 +27,7 @@
           __is_nothrow_assignable(__add_lvalue_reference_t<_Tp>, __add_rvalue_reference_t<_Tp>)> {
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_constructible.h
index ad8222a..21a22bb 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_nothrow_move_constructible.h
@@ -35,7 +35,7 @@
 
 #endif // _LIBCPP_COMPILER_GCC
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_null_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/is_null_pointer.h
index 4864cee..3a94fce 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_null_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_null_pointer.h
@@ -26,15 +26,15 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t
     : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {};
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer
     : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
 #endif
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_object.h b/third_party/llvm-project/libcxx/include/__type_traits/is_object.h
index 943f1a7..4d038c3 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_object.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_object.h
@@ -27,7 +27,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_object_v = __is_object(_Tp);
 #endif
@@ -40,7 +40,7 @@
                                      is_union<_Tp>::value  ||
                                      is_class<_Tp>::value  > {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_object_v = is_object<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_pod.h b/third_party/llvm-project/libcxx/include/__type_traits/is_pod.h
index c1d00b2..851cbd1 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_pod.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_pod.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod
     : public integral_constant<bool, __is_pod(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_pod_v = __is_pod(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/is_pointer.h
index 3c0ad04..51c628f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_pointer.h
@@ -24,7 +24,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_pointer_v = __is_pointer(_Tp);
 #endif
@@ -45,7 +45,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer
     : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<__remove_cv_t<_Tp> >::type> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_polymorphic.h b/third_party/llvm-project/libcxx/include/__type_traits/is_polymorphic.h
index 96da48a..21b3cdc 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_polymorphic.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_polymorphic.h
@@ -22,7 +22,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_polymorphic
     : public integral_constant<bool, __is_polymorphic(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_polymorphic_v = __is_polymorphic(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_reference.h b/third_party/llvm-project/libcxx/include/__type_traits/is_reference.h
index 27ca2dd..3334c60 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_reference.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_reference.h
@@ -31,7 +31,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_reference_v = __is_reference(_Tp);
 template <class _Tp>
@@ -52,7 +52,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&>  : public true_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_same.h b/third_party/llvm-project/libcxx/include/__type_traits/is_same.h
index 6fa0afb..c598f0d 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_same.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_same.h
@@ -21,7 +21,7 @@
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Up>
 inline constexpr bool is_same_v = __is_same(_Tp, _Up);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_scalar.h b/third_party/llvm-project/libcxx/include/__type_traits/is_scalar.h
index b4dc70b..9892ae0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_scalar.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_scalar.h
@@ -28,7 +28,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_scalar_v = __is_scalar(_Tp);
 #endif
@@ -50,7 +50,7 @@
 
 template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_scoped_enum.h b/third_party/llvm-project/libcxx/include/__type_traits/is_scoped_enum.h
index 85a4128..3f0fd58 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_scoped_enum.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_scoped_enum.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _Tp, bool = is_enum_v<_Tp> >
 struct __is_scoped_enum_helper : false_type {};
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_signed.h b/third_party/llvm-project/libcxx/include/__type_traits/is_signed.h
index aa42a4e..ebd3873 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_signed.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_signed.h
@@ -25,7 +25,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_signed_v = __is_signed(_Tp);
 #endif
@@ -45,7 +45,7 @@
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_specialization.h b/third_party/llvm-project/libcxx/include/__type_traits/is_specialization.h
index 0cc3667..9b75636 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_specialization.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_specialization.h
@@ -30,7 +30,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Tp, template <class...> class _Template>
 inline constexpr bool __is_specialization_v = false; // true if and only if _Tp is a specialization of _Template
@@ -38,7 +38,7 @@
 template <template <class...> class _Template, class... _Args>
 inline constexpr bool __is_specialization_v<_Template<_Args...>, _Template> = true;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_standard_layout.h b/third_party/llvm-project/libcxx/include/__type_traits/is_standard_layout.h
index 12c1712..aae533b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_standard_layout.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_standard_layout.h
@@ -22,7 +22,7 @@
     : public integral_constant<bool, __is_standard_layout(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_standard_layout_v = __is_standard_layout(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_swappable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_swappable.h
index 3821de1..5a78f47 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_swappable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_swappable.h
@@ -108,7 +108,7 @@
 {
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS is_swappable_with
@@ -158,7 +158,7 @@
 template <class _Tp>
 inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivial.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivial.h
index 840770d..f439048 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivial.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivial.h
@@ -22,7 +22,7 @@
     : public integral_constant<bool, __is_trivial(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivial_v = __is_trivial(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_assignable.h
index 9ef101f..c16d177 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_assignable.h
@@ -23,7 +23,7 @@
     : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)>
 { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class _Arg>
 inline constexpr bool is_trivially_assignable_v = __is_trivially_assignable(_Tp, _Arg);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_constructible.h
index 4173e3b..a71a49b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_constructible.h
@@ -24,7 +24,7 @@
 {
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp, class... _Args>
 inline constexpr bool is_trivially_constructible_v = __is_trivially_constructible(_Tp, _Args...);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_assignable.h
index e6a4a35..b38ab7e 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_assignable.h
@@ -28,7 +28,7 @@
               __add_lvalue_reference_t<_Tp>,
               __add_lvalue_reference_t<typename add_const<_Tp>::type>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_constructible.h
index 4bbb803..c6c96a0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copy_constructible.h
@@ -23,7 +23,7 @@
     : public integral_constant<bool, __is_trivially_constructible(_Tp, __add_lvalue_reference_t<const _Tp>)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copyable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copyable.h
index ef118bf..a725a0b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copyable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_copyable.h
@@ -11,6 +11,7 @@
 
 #include <__config>
 #include <__type_traits/integral_constant.h>
+#include <cstdint>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,11 +23,16 @@
     : public integral_constant<bool, __is_trivially_copyable(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_copyable_v = __is_trivially_copyable(_Tp);
 #endif
 
+#if _LIBCPP_STD_VER >= 20
+template <class _Tp>
+inline constexpr bool __is_cheap_to_copy = is_trivially_copyable_v<_Tp> && sizeof(_Tp) <= sizeof(std::intmax_t);
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_IS_TRIVIALLY_COPYABLE_H
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_default_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_default_constructible.h
index 5c53bd5..2b64a69 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_default_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_default_constructible.h
@@ -22,7 +22,7 @@
     : public integral_constant<bool, __is_trivially_constructible(_Tp)>
     {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_default_constructible_v = __is_trivially_constructible(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_destructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_destructible.h
index 0239fca..e718af0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_destructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_destructible.h
@@ -35,7 +35,7 @@
 
 #endif // __has_builtin(__is_trivially_destructible)
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_assignable.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_assignable.h
index 8f8876f..daf890b 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_assignable.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_assignable.h
@@ -26,7 +26,7 @@
           bool,
           __is_trivially_assignable(__add_lvalue_reference_t<_Tp>, __add_rvalue_reference_t<_Tp>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_constructible.h b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_constructible.h
index 151bb25..71e6f89 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_constructible.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_trivially_move_constructible.h
@@ -23,7 +23,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible
     : public integral_constant<bool, __is_trivially_constructible(_Tp, __add_rvalue_reference_t<_Tp>)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_unbounded_array.h b/third_party/llvm-project/libcxx/include/__type_traits/is_unbounded_array.h
index 11a1260..16bc62d 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_unbounded_array.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_unbounded_array.h
@@ -21,7 +21,7 @@
 template <class>     struct _LIBCPP_TEMPLATE_VIS __libcpp_is_unbounded_array        : false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __libcpp_is_unbounded_array<_Tp[]> : true_type {};
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class>     struct _LIBCPP_TEMPLATE_VIS is_unbounded_array        : false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {};
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_union.h b/third_party/llvm-project/libcxx/include/__type_traits/is_union.h
index 998aedd..6d2f47a 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_union.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_union.h
@@ -21,7 +21,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union
     : public integral_constant<bool, __is_union(_Tp)> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_union_v = __is_union(_Tp);
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_unsigned.h b/third_party/llvm-project/libcxx/include/__type_traits/is_unsigned.h
index 3d75409..d955106 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_unsigned.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_unsigned.h
@@ -25,7 +25,7 @@
 template<class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
 #endif
@@ -45,7 +45,7 @@
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_void.h b/third_party/llvm-project/libcxx/include/__type_traits/is_void.h
index d8ffdbd..7e8b8b6 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_void.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_void.h
@@ -25,7 +25,7 @@
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_void_v = __is_void(_Tp);
 #endif
@@ -35,7 +35,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void
     : public is_same<__remove_cv_t<_Tp>, void> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_void_v = is_void<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/is_volatile.h b/third_party/llvm-project/libcxx/include/__type_traits/is_volatile.h
index fb92267..c020220 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/is_volatile.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/is_volatile.h
@@ -23,7 +23,7 @@
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_volatile_v = __is_volatile(_Tp);
 #endif
@@ -33,7 +33,7 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile               : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/make_32_64_or_128_bit.h b/third_party/llvm-project/libcxx/include/__type_traits/make_32_64_or_128_bit.h
index 87340ea..3059571 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/make_32_64_or_128_bit.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/make_32_64_or_128_bit.h
@@ -27,7 +27,7 @@
 ///
 /// The restriction is the same as the integral version of to_char.
 template <class _Tp>
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   requires (is_signed_v<_Tp> || is_unsigned_v<_Tp> || is_same_v<_Tp, char>)
 #endif
 using __make_32_64_or_128_bit_t =
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/make_signed.h b/third_party/llvm-project/libcxx/include/__type_traits/make_signed.h
index bff8744..71383d0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/make_signed.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/make_signed.h
@@ -77,7 +77,7 @@
   using type _LIBCPP_NODEBUG = __make_signed_t<_Tp>;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using make_signed_t = __make_signed_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/make_unsigned.h b/third_party/llvm-project/libcxx/include/__type_traits/make_unsigned.h
index 33c3014..76d1889 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/make_unsigned.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/make_unsigned.h
@@ -79,7 +79,7 @@
   using type _LIBCPP_NODEBUG = __make_unsigned_t<_Tp>;
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using make_unsigned_t = __make_unsigned_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/negation.h b/third_party/llvm-project/libcxx/include/__type_traits/negation.h
index b72f285..3a70ef1 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/negation.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/negation.h
@@ -21,12 +21,12 @@
 template <class _Pred>
 struct _Not : _BoolConstant<!_Pred::value> {};
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 struct negation : _Not<_Tp> {};
 template<class _Tp>
 inline constexpr bool negation_v = !_Tp::value;
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/noexcept_move_assign_container.h b/third_party/llvm-project/libcxx/include/__type_traits/noexcept_move_assign_container.h
index 35b0e51..65384d0 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/noexcept_move_assign_container.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/noexcept_move_assign_container.h
@@ -23,7 +23,7 @@
 template <typename _Alloc, typename _Traits=allocator_traits<_Alloc> >
 struct __noexcept_move_assign_container : public integral_constant<bool,
     _Traits::propagate_on_container_move_assignment::value
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         || _Traits::is_always_equal::value
 #else
         && is_nothrow_move_assignable<_Alloc>::value
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/predicate_traits.h b/third_party/llvm-project/libcxx/include/__type_traits/predicate_traits.h
new file mode 100644
index 0000000..872608e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__type_traits/predicate_traits.h
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___TYPE_TRAITS_PREDICATE_TRAITS
+#define _LIBCPP___TYPE_TRAITS_PREDICATE_TRAITS
+
+#include <__config>
+#include <__type_traits/integral_constant.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Pred, class _Lhs, class _Rhs>
+struct __is_trivial_equality_predicate : false_type {};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TYPE_TRAITS_PREDICATE_TRAITS
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/promote.h b/third_party/llvm-project/libcxx/include/__type_traits/promote.h
index c2af327..e01e778 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/promote.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/promote.h
@@ -13,7 +13,6 @@
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/is_same.h>
 #include <__utility/declval.h>
-#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/rank.h b/third_party/llvm-project/libcxx/include/__type_traits/rank.h
index 9950907..5f3fab8 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/rank.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/rank.h
@@ -36,7 +36,7 @@
 
 #endif // __has_builtin(__array_rank)
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr size_t rank_v = rank<_Tp>::value;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_all_extents.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
index 868cf10..f7e3225 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_all_extents.h
@@ -38,7 +38,7 @@
 using __remove_all_extents_t = typename remove_all_extents<_Tp>::type;
 #endif // __has_builtin(__remove_all_extents)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_all_extents_t = __remove_all_extents_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_const.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_const.h
index dc56533..37f0609 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_const.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_const.h
@@ -33,7 +33,7 @@
 using __remove_const_t = typename remove_const<_Tp>::type;
 #endif // __has_builtin(__remove_const)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_const_t = __remove_const_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_cv.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_cv.h
index ea85e23..7eb8940 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_cv.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_cv.h
@@ -35,7 +35,7 @@
 using __remove_cv_t = __remove_volatile_t<__remove_const_t<_Tp> >;
 #endif // __has_builtin(__remove_cv)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_cv_t = __remove_cv_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_cvref.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_cvref.h
index e96cc65..f1111fd 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_cvref.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_cvref.h
@@ -31,7 +31,7 @@
 template <class _Tp, class _Up>
 struct __is_same_uncvref : _IsSame<__remove_cvref_t<_Tp>, __remove_cvref_t<_Up> > {};
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp>
 struct remove_cvref {
     using type _LIBCPP_NODEBUG = __remove_cvref_t<_Tp>;
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_extent.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_extent.h
index 79d6e57..65dfcdc 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_extent.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_extent.h
@@ -38,7 +38,7 @@
 using __remove_extent_t = typename remove_extent<_Tp>::type;
 #endif // __has_builtin(__remove_extent)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_extent_t = __remove_extent_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_pointer.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_pointer.h
index 33ddb71..8b3a9c7 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_pointer.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_pointer.h
@@ -17,7 +17,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__remove_pointer)
+#if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__remove_pointer)
 template <class _Tp>
 struct remove_pointer {
   using type _LIBCPP_NODEBUG = __remove_pointer(_Tp);
@@ -34,9 +34,9 @@
 
 template <class _Tp>
 using __remove_pointer_t = typename remove_pointer<_Tp>::type;
-#endif // __has_builtin(__remove_pointer)
+#endif // !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__remove_pointer)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_pointer_t = __remove_pointer_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_reference.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_reference.h
index b9a6974..1d510c2 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_reference.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_reference.h
@@ -35,7 +35,7 @@
 using __libcpp_remove_reference_t = typename remove_reference<_Tp>::type;
 #endif // __has_builtin(__remove_reference_t)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_reference_t = __libcpp_remove_reference_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/remove_volatile.h b/third_party/llvm-project/libcxx/include/__type_traits/remove_volatile.h
index ed6d63b..cc9fb55 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/remove_volatile.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/remove_volatile.h
@@ -33,7 +33,7 @@
 using __remove_volatile_t = typename remove_volatile<_Tp>::type;
 #endif // __has_builtin(__remove_volatile)
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using remove_volatile_t = __remove_volatile_t<_Tp>;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/result_of.h b/third_party/llvm-project/libcxx/include/__type_traits/result_of.h
index 804173e..dff2828 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/result_of.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/result_of.h
@@ -29,9 +29,9 @@
 {
 };
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type;
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/type_identity.h b/third_party/llvm-project/libcxx/include/__type_traits/type_identity.h
index 42e52b1..92f288f 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/type_identity.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/type_identity.h
@@ -23,7 +23,7 @@
 template <class _Tp>
 using __type_identity_t _LIBCPP_NODEBUG = typename __type_identity<_Tp>::type;
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<class _Tp> struct type_identity { typedef _Tp type; };
 template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type;
 #endif
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/underlying_type.h b/third_party/llvm-project/libcxx/include/__type_traits/underlying_type.h
index 1c8db64..6f52d67 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/underlying_type.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/underlying_type.h
@@ -32,7 +32,7 @@
 template <class _Tp>
 struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {};
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__type_traits/void_t.h b/third_party/llvm-project/libcxx/include/__type_traits/void_t.h
index 1ed4e43..2fe438c 100644
--- a/third_party/llvm-project/libcxx/include/__type_traits/void_t.h
+++ b/third_party/llvm-project/libcxx/include/__type_traits/void_t.h
@@ -17,7 +17,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class...> using void_t = void;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/as_const.h b/third_party/llvm-project/libcxx/include/__utility/as_const.h
index d4a72f4..b5c6091 100644
--- a/third_party/llvm-project/libcxx/include/__utility/as_const.h
+++ b/third_party/llvm-project/libcxx/include/__utility/as_const.h
@@ -20,7 +20,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/auto_cast.h b/third_party/llvm-project/libcxx/include/__utility/auto_cast.h
index 381ed0c..06715b3 100644
--- a/third_party/llvm-project/libcxx/include/__utility/auto_cast.h
+++ b/third_party/llvm-project/libcxx/include/__utility/auto_cast.h
@@ -17,6 +17,6 @@
 #  pragma GCC system_header
 #endif
 
-#define _LIBCPP_AUTO_CAST(expr) static_cast<typename decay<decltype((expr))>::type>(expr)
+#define _LIBCPP_AUTO_CAST(expr) static_cast<::std::__decay_t<decltype((expr))> >(expr)
 
 #endif // _LIBCPP___UTILITY_AUTO_CAST_H
diff --git a/third_party/llvm-project/libcxx/include/__utility/cmp.h b/third_party/llvm-project/libcxx/include/__utility/cmp.h
index d448a1d..7b7b901 100644
--- a/third_party/llvm-project/libcxx/include/__utility/cmp.h
+++ b/third_party/llvm-project/libcxx/include/__utility/cmp.h
@@ -28,7 +28,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<class _Tp, class... _Up>
 struct _IsSameAsAny : _Or<_IsSame<_Tp, _Up>...> {};
 
@@ -102,7 +102,7 @@
   return _VSTD::cmp_less_equal(__u, numeric_limits<_Tp>::max()) &&
          _VSTD::cmp_greater_equal(__u, numeric_limits<_Tp>::min());
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/exception_guard.h b/third_party/llvm-project/libcxx/include/__utility/exception_guard.h
index 737d1a6..1db8f8a 100644
--- a/third_party/llvm-project/libcxx/include/__utility/exception_guard.h
+++ b/third_party/llvm-project/libcxx/include/__utility/exception_guard.h
@@ -41,7 +41,7 @@
 // less common, especially one that tries to catch an exception through -fno-exceptions code.
 //
 // __exception_guard can help greatly simplify code that would normally be cluttered by
-// `#if _LIBCPP_NO_EXCEPTIONS`. For example:
+// `#if _LIBCPP_HAS_NO_EXCEPTIONS`. For example:
 //
 //    template <class Iterator, class Size, class OutputIterator>
 //    Iterator uninitialized_copy_n(Iterator iter, Size n, OutputIterator out) {
@@ -58,27 +58,27 @@
 //    }
 //
 
-#ifndef _LIBCPP_NO_EXCEPTIONS
 template <class _Rollback>
-struct __exception_guard {
-  __exception_guard() = delete;
+struct __exception_guard_exceptions {
+  __exception_guard_exceptions() = delete;
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit __exception_guard(_Rollback __rollback)
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit __exception_guard_exceptions(_Rollback __rollback)
       : __rollback_(std::move(__rollback)), __completed_(false) {}
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __exception_guard(__exception_guard&& __other)
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+  __exception_guard_exceptions(__exception_guard_exceptions&& __other)
       _NOEXCEPT_(is_nothrow_move_constructible<_Rollback>::value)
       : __rollback_(std::move(__other.__rollback_)), __completed_(__other.__completed_) {
     __other.__completed_ = true;
   }
 
-  __exception_guard(__exception_guard const&)            = delete;
-  __exception_guard& operator=(__exception_guard const&) = delete;
-  __exception_guard& operator=(__exception_guard&&)      = delete;
+  __exception_guard_exceptions(__exception_guard_exceptions const&)            = delete;
+  __exception_guard_exceptions& operator=(__exception_guard_exceptions const&) = delete;
+  __exception_guard_exceptions& operator=(__exception_guard_exceptions&&)      = delete;
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __complete() _NOEXCEPT { __completed_ = true; }
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__exception_guard() {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__exception_guard_exceptions() {
     if (!__completed_)
       __rollback_();
   }
@@ -87,36 +87,47 @@
   _Rollback __rollback_;
   bool __completed_;
 };
-#else  // _LIBCPP_NO_EXCEPTIONS
-template <class _Rollback>
-struct __exception_guard {
-  __exception_guard() = delete;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG explicit __exception_guard(_Rollback) {}
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG __exception_guard(__exception_guard&& __other)
+_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__exception_guard_exceptions);
+
+template <class _Rollback>
+struct __exception_guard_noexceptions {
+  __exception_guard_noexceptions() = delete;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+      _LIBCPP_NODEBUG explicit __exception_guard_noexceptions(_Rollback) {}
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG
+  __exception_guard_noexceptions(__exception_guard_noexceptions&& __other)
       _NOEXCEPT_(is_nothrow_move_constructible<_Rollback>::value)
       : __completed_(__other.__completed_) {
     __other.__completed_ = true;
   }
 
-  __exception_guard(__exception_guard const&)            = delete;
-  __exception_guard& operator=(__exception_guard const&) = delete;
-  __exception_guard& operator=(__exception_guard&&)      = delete;
+  __exception_guard_noexceptions(__exception_guard_noexceptions const&)            = delete;
+  __exception_guard_noexceptions& operator=(__exception_guard_noexceptions const&) = delete;
+  __exception_guard_noexceptions& operator=(__exception_guard_noexceptions&&)      = delete;
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG void __complete() _NOEXCEPT {
     __completed_ = true;
   }
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG ~__exception_guard() {
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NODEBUG ~__exception_guard_noexceptions() {
     _LIBCPP_ASSERT(__completed_, "__exception_guard not completed with exceptions disabled");
   }
 
 private:
   bool __completed_ = false;
 };
-#endif // _LIBCPP_NO_EXCEPTIONS
 
-_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__exception_guard);
+_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__exception_guard_noexceptions);
+
+#ifdef _LIBCPP_HAS_NO_EXCEPTIONS
+template <class _Rollback>
+using __exception_guard = __exception_guard_noexceptions<_Rollback>;
+#else
+template <class _Rollback>
+using __exception_guard = __exception_guard_exceptions<_Rollback>;
+#endif
 
 template <class _Rollback>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __exception_guard<_Rollback> __make_exception_guard(_Rollback __rollback) {
diff --git a/third_party/llvm-project/libcxx/include/__utility/exchange.h b/third_party/llvm-project/libcxx/include/__utility/exchange.h
index 8df71a1..4cc5e04 100644
--- a/third_party/llvm-project/libcxx/include/__utility/exchange.h
+++ b/third_party/llvm-project/libcxx/include/__utility/exchange.h
@@ -21,7 +21,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template<class _T1, class _T2 = _T1>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
 _T1 exchange(_T1& __obj, _T2&& __new_value)
@@ -31,7 +31,7 @@
     __obj = _VSTD::forward<_T2>(__new_value);
     return __old_value;
 }
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/forward_like.h b/third_party/llvm-project/libcxx/include/__utility/forward_like.h
index 7bb0d7d..ce11b64 100644
--- a/third_party/llvm-project/libcxx/include/__utility/forward_like.h
+++ b/third_party/llvm-project/libcxx/include/__utility/forward_like.h
@@ -22,7 +22,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 template <class _Ap, class _Bp>
 using _CopyConst = _If<is_const_v<_Ap>, const _Bp, _Bp>;
@@ -39,7 +39,7 @@
   return static_cast<_ForwardLike<_Tp, _Up>>(__ux);
 }
 
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/in_place.h b/third_party/llvm-project/libcxx/include/__utility/in_place.h
index a351845..c1c6a67 100644
--- a/third_party/llvm-project/libcxx/include/__utility/in_place.h
+++ b/third_party/llvm-project/libcxx/include/__utility/in_place.h
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 struct _LIBCPP_TYPE_VIS in_place_t {
     explicit in_place_t() = default;
@@ -52,7 +52,7 @@
 template <class _Tp>
 using __is_inplace_index = __is_inplace_index_imp<__remove_cvref_t<_Tp>>;
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/integer_sequence.h b/third_party/llvm-project/libcxx/include/__utility/integer_sequence.h
index 257b430..633b387 100644
--- a/third_party/llvm-project/libcxx/include/__utility/integer_sequence.h
+++ b/third_party/llvm-project/libcxx/include/__utility/integer_sequence.h
@@ -85,7 +85,7 @@
 
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template<class _Tp, _Tp... _Ip>
 struct _LIBCPP_TEMPLATE_VIS integer_sequence
@@ -138,15 +138,15 @@
 template<class... _Tp>
     using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 // Executes __func for every element in an index_sequence.
 template <size_t... _Index, class _Function>
 _LIBCPP_HIDE_FROM_ABI constexpr void __for_each_index_sequence(index_sequence<_Index...>, _Function __func) {
     (__func.template operator()<_Index>(), ...);
 }
-#  endif // _LIBCPP_STD_VER > 17
+#  endif // _LIBCPP_STD_VER >= 20
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/pair.h b/third_party/llvm-project/libcxx/include/__utility/pair.h
index 8151674..77baba9 100644
--- a/third_party/llvm-project/libcxx/include/__utility/pair.h
+++ b/third_party/llvm-project/libcxx/include/__utility/pair.h
@@ -15,13 +15,14 @@
 #include <__functional/unwrap_ref.h>
 #include <__fwd/get.h>
 #include <__fwd/tuple.h>
-#include <__tuple_dir/sfinae_helpers.h>
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_indices.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/sfinae_helpers.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_size.h>
 #include <__type_traits/common_reference.h>
 #include <__type_traits/common_type.h>
 #include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
 #include <__type_traits/is_assignable.h>
 #include <__type_traits/is_constructible.h>
 #include <__type_traits/is_convertible.h>
@@ -49,15 +50,13 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
 template <class, class>
 struct __non_trivially_copyable_base {
-  _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+  _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI
   __non_trivially_copyable_base() _NOEXCEPT {}
-  _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY
+  _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI
   __non_trivially_copyable_base(__non_trivially_copyable_base const&) _NOEXCEPT {}
 };
-#endif
 
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS pair
@@ -65,8 +64,8 @@
 : private __non_trivially_copyable_base<_T1, _T2>
 #endif
 {
-    typedef _T1 first_type;
-    typedef _T2 second_type;
+    using first_type = _T1;
+    using second_type = _T2;
 
     _T1 first;
     _T2 second;
@@ -75,17 +74,17 @@
     pair(pair&&) = default;
 
 #ifdef _LIBCPP_CXX03_LANG
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     pair() : first(), second() {}
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     pair(_T1 const& __t1, _T2 const& __t2) : first(__t1), second(__t2) {}
 
     template <class _U1, class _U2>
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {}
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_HIDE_FROM_ABI
     pair& operator=(pair const& __p) {
         first = __p.first;
         second = __p.second;
@@ -154,7 +153,7 @@
     template <class _Tuple>
     using _CheckTLC _LIBCPP_NODEBUG = __conditional_t<
         __tuple_like_with_size<_Tuple, 2>::value
-            && !is_same<typename decay<_Tuple>::type, pair>::value,
+            && !is_same<__decay_t<_Tuple>, pair>::value,
         _CheckTupleLikeConstructor,
         __check_tuple_constructor_fail
     >;
@@ -162,7 +161,7 @@
     template<bool _Dummy = true, typename enable_if<
             _CheckArgsDep<_Dummy>::__enable_explicit_default()
     >::type* = nullptr>
-    explicit _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
+    explicit _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
     pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value &&
                       is_nothrow_default_constructible<second_type>::value)
         : first(), second() {}
@@ -170,7 +169,7 @@
     template<bool _Dummy = true, typename enable_if<
             _CheckArgsDep<_Dummy>::__enable_implicit_default()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
     pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value &&
                       is_nothrow_default_constructible<second_type>::value)
         : first(), second() {}
@@ -178,7 +177,7 @@
     template <bool _Dummy = true, typename enable_if<
              _CheckArgsDep<_Dummy>::template __enable_explicit<_T1 const&, _T2 const&>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     explicit pair(_T1 const& __t1, _T2 const& __t2)
         _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
                    is_nothrow_copy_constructible<second_type>::value)
@@ -187,41 +186,41 @@
     template<bool _Dummy = true, typename enable_if<
             _CheckArgsDep<_Dummy>::template __enable_implicit<_T1 const&, _T2 const&>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     pair(_T1 const& __t1, _T2 const& __t2)
         _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
                    is_nothrow_copy_constructible<second_type>::value)
         : first(__t1), second(__t2) {}
 
     template <
-#if _LIBCPP_STD_VER > 20 // http://wg21.link/P1951
+#if _LIBCPP_STD_VER >= 23 // http://wg21.link/P1951
         class _U1 = _T1, class _U2 = _T2,
 #else
         class _U1, class _U2,
 #endif
         typename enable_if<_CheckArgs::template __enable_explicit<_U1, _U2>()>::type* = nullptr
     >
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     explicit pair(_U1&& __u1, _U2&& __u2)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value &&
                     is_nothrow_constructible<second_type, _U2>::value))
-        : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
+        : first(std::forward<_U1>(__u1)), second(std::forward<_U2>(__u2)) {}
 
     template <
-#if _LIBCPP_STD_VER > 20 // http://wg21.link/P1951
+#if _LIBCPP_STD_VER >= 23 // http://wg21.link/P1951
         class _U1 = _T1, class _U2 = _T2,
 #else
         class _U1, class _U2,
 #endif
         typename enable_if<_CheckArgs::template __enable_implicit<_U1, _U2>()>::type* = nullptr
     >
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     pair(_U1&& __u1, _U2&& __u2)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value &&
                     is_nothrow_constructible<second_type, _U2>::value))
-        : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
+        : first(std::forward<_U1>(__u1)), second(std::forward<_U2>(__u2)) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template<class _U1, class _U2, __enable_if_t<
             _CheckArgs::template __is_pair_constructible<_U1&, _U2&>()
     >* = nullptr>
@@ -235,7 +234,7 @@
     template<class _U1, class _U2, typename enable_if<
             _CheckArgs::template __enable_explicit<_U1 const&, _U2 const&>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     explicit pair(pair<_U1, _U2> const& __p)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value &&
                     is_nothrow_constructible<second_type, _U2 const&>::value))
@@ -244,7 +243,7 @@
     template<class _U1, class _U2, typename enable_if<
             _CheckArgs::template __enable_implicit<_U1 const&, _U2 const&>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     pair(pair<_U1, _U2> const& __p)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value &&
                     is_nothrow_constructible<second_type, _U2 const&>::value))
@@ -253,22 +252,22 @@
     template<class _U1, class _U2, typename enable_if<
             _CheckArgs::template __enable_explicit<_U1, _U2>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     explicit pair(pair<_U1, _U2>&&__p)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value &&
                     is_nothrow_constructible<second_type, _U2&&>::value))
-        : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
+        : first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) {}
 
     template<class _U1, class _U2, typename enable_if<
             _CheckArgs::template __enable_implicit<_U1, _U2>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     pair(pair<_U1, _U2>&& __p)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value &&
                     is_nothrow_constructible<second_type, _U2&&>::value))
-        : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
+        : first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template<class _U1, class _U2, __enable_if_t<
             _CheckArgs::template __is_pair_constructible<const _U1&&, const _U2&&>()
     >* = nullptr>
@@ -283,21 +282,21 @@
     template<class _Tuple, typename enable_if<
             _CheckTLC<_Tuple>::template __enable_explicit<_Tuple>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     explicit pair(_Tuple&& __p)
-        : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
-          second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
+        : first(std::get<0>(std::forward<_Tuple>(__p))),
+          second(std::get<1>(std::forward<_Tuple>(__p))) {}
 
     template<class _Tuple, typename enable_if<
             _CheckTLC<_Tuple>::template __enable_implicit<_Tuple>()
     >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     pair(_Tuple&& __p)
-        : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
-          second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
+        : first(std::get<0>(std::forward<_Tuple>(__p))),
+          second(std::get<1>(std::forward<_Tuple>(__p))) {}
 
     template <class... _Args1, class... _Args2>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     pair(piecewise_construct_t __pc,
          tuple<_Args1...> __first_args, tuple<_Args2...> __second_args)
         _NOEXCEPT_((is_nothrow_constructible<first_type, _Args1...>::value &&
@@ -306,7 +305,7 @@
                 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
                 typename __make_tuple_indices<sizeof...(_Args2) >::type()) {}
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     pair& operator=(__conditional_t<
                         is_copy_assignable<first_type>::value &&
                         is_copy_assignable<second_type>::value,
@@ -319,7 +318,7 @@
         return *this;
     }
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     pair& operator=(__conditional_t<
                         is_move_assignable<first_type>::value &&
                         is_move_assignable<second_type>::value,
@@ -327,12 +326,12 @@
         _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
                    is_nothrow_move_assignable<second_type>::value)
     {
-        first = _VSTD::forward<first_type>(__p.first);
-        second = _VSTD::forward<second_type>(__p.second);
+        first = std::forward<first_type>(__p.first);
+        second = std::forward<second_type>(__p.second);
         return *this;
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr
     const pair& operator=(pair const& __p) const
       noexcept(is_nothrow_copy_assignable_v<const first_type> &&
@@ -374,30 +373,30 @@
         second = std::forward<_U2>(__p.second);
         return *this;
     }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     template <class _Tuple, typename enable_if<
             _CheckTLC<_Tuple>::template __enable_assign<_Tuple>()
      >::type* = nullptr>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     pair& operator=(_Tuple&& __p) {
-        first = _VSTD::get<0>(_VSTD::forward<_Tuple>(__p));
-        second = _VSTD::get<1>(_VSTD::forward<_Tuple>(__p));
+        first = std::get<0>(std::forward<_Tuple>(__p));
+        second = std::get<1>(std::forward<_Tuple>(__p));
         return *this;
     }
-#endif
+#endif // _LIBCPP_CXX03_LANG
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     void
     swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
                                __is_nothrow_swappable<second_type>::value)
     {
-        using _VSTD::swap;
+        using std::swap;
         swap(first,  __p.first);
         swap(second, __p.second);
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr
     void swap(const pair& __p) const
         noexcept(__is_nothrow_swappable<const first_type>::value &&
@@ -412,88 +411,88 @@
 
 #ifndef _LIBCPP_CXX03_LANG
     template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     pair(piecewise_construct_t,
          tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
          __tuple_indices<_I1...>, __tuple_indices<_I2...>);
 #endif
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _T1, class _T2>
 pair(_T1, _T2) -> pair<_T1, _T2>;
 #endif
 
 // [pairs.spec], specialized algorithms
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator==(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return __x.first == __y.first && __x.second == __y.second;
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
-template <class _T1, class _T2>
+template <class _T1, class _T2, class _U1, class _U2>
 _LIBCPP_HIDE_FROM_ABI constexpr
 common_comparison_category_t<
-        __synth_three_way_result<_T1>,
-        __synth_three_way_result<_T2> >
-operator<=>(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+        __synth_three_way_result<_T1, _U1>,
+        __synth_three_way_result<_T2, _U2> >
+operator<=>(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
-    if (auto __c = _VSTD::__synth_three_way(__x.first, __y.first); __c != 0) {
+    if (auto __c = std::__synth_three_way(__x.first, __y.first); __c != 0) {
       return __c;
     }
-    return _VSTD::__synth_three_way(__x.second, __y.second);
+    return std::__synth_three_way(__x.second, __y.second);
 }
 
-#else // _LIBCPP_STD_VER > 17
+#else // _LIBCPP_STD_VER >= 20
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator!=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return !(__x == __y);
 }
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator< (const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
 }
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator> (const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return __y < __x;
 }
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator>=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return !(__x < __y);
 }
 
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+template <class _T1, class _T2, class _U1, class _U2>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 bool
-operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
+operator<=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y)
 {
     return !(__y < __x);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _T1, class _T2, class _U1, class _U2, template<class> class _TQual, template<class> class _UQual>
     requires requires { typename pair<common_reference_t<_TQual<_T1>, _UQual<_U1>>,
                                       common_reference_t<_TQual<_T2>, _UQual<_U2>>>; }
@@ -507,10 +506,10 @@
 struct common_type<pair<_T1, _T2>, pair<_U1, _U2>> {
     using type = pair<common_type_t<_T1, _U1>, common_type_t<_T2, _U2>>;
 };
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
 typename enable_if
 <
     __is_swappable<_T1>::value &&
@@ -524,7 +523,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _T1, class _T2>
   requires (__is_swappable<const _T1>::value &&
             __is_swappable<const _T2>::value)
@@ -537,12 +536,12 @@
 #endif
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type>
 make_pair(_T1&& __t1, _T2&& __t2)
 {
     return pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type>
-               (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
+               (std::forward<_T1>(__t1), std::forward<_T2>(__t2));
 }
 
 template <class _T1, class _T2>
@@ -558,13 +557,13 @@
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
 {
-    typedef _LIBCPP_NODEBUG _T1 type;
+    using type _LIBCPP_NODEBUG = _T1;
 };
 
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
 {
-    typedef _LIBCPP_NODEBUG _T2 type;
+    using type _LIBCPP_NODEBUG = _T2;
 };
 
 template <size_t _Ip> struct __get_pair;
@@ -574,27 +573,27 @@
 {
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     _T1&
     get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     const _T1&
     get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     _T1&&
-    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
+    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<_T1>(__p.first);}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     const _T1&&
-    get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
+    get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<const _T1>(__p.first);}
 };
 
 template <>
@@ -602,31 +601,31 @@
 {
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     _T2&
     get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     const _T2&
     get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     _T2&&
-    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
+    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<_T2>(__p.second);}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
     const _T2&&
-    get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);}
+    get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<const _T2>(__p.second);}
 };
 
 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -634,7 +633,7 @@
 }
 
 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -642,79 +641,79 @@
 }
 
 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&& __p) _NOEXCEPT
 {
-    return __get_pair<_Ip>::get(_VSTD::move(__p));
+    return __get_pair<_Ip>::get(std::move(__p));
 }
 
 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(const pair<_T1, _T2>&& __p) _NOEXCEPT
 {
-    return __get_pair<_Ip>::get(_VSTD::move(__p));
+    return __get_pair<_Ip>::get(std::move(__p));
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
 {
     return __get_pair<0>::get(__p);
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
 {
     return __get_pair<0>::get(__p);
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
 {
-    return __get_pair<0>::get(_VSTD::move(__p));
+    return __get_pair<0>::get(std::move(__p));
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
 {
-    return __get_pair<0>::get(_VSTD::move(__p));
+    return __get_pair<0>::get(std::move(__p));
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
 {
     return __get_pair<1>::get(__p);
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
 {
     return __get_pair<1>::get(__p);
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
 {
-    return __get_pair<1>::get(_VSTD::move(__p));
+    return __get_pair<1>::get(std::move(__p));
 }
 
 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_HIDE_FROM_ABI
 constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
 {
-    return __get_pair<1>::get(_VSTD::move(__p));
+    return __get_pair<1>::get(std::move(__p));
 }
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/piecewise_construct.h b/third_party/llvm-project/libcxx/include/__utility/piecewise_construct.h
index 3cc86fe..071e207 100644
--- a/third_party/llvm-project/libcxx/include/__utility/piecewise_construct.h
+++ b/third_party/llvm-project/libcxx/include/__utility/piecewise_construct.h
@@ -18,9 +18,10 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t { explicit piecewise_construct_t() = default; };
-#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
-extern _LIBCPP_EXPORTED_FROM_ABI const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
-#else
+
+#if defined(_LIBCPP_BUILDING_LIBRARY)
+extern _LIBCPP_EXPORTED_FROM_ABI const piecewise_construct_t piecewise_construct;
+#elif !defined(_LIBCPP_CXX03_LANG)
 /* inline */ constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/__utility/to_underlying.h b/third_party/llvm-project/libcxx/include/__utility/to_underlying.h
index a194d3e..b70f70a 100644
--- a/third_party/llvm-project/libcxx/include/__utility/to_underlying.h
+++ b/third_party/llvm-project/libcxx/include/__utility/to_underlying.h
@@ -27,7 +27,7 @@
 }
 #endif // !_LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _Tp>
 _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY constexpr underlying_type_t<_Tp>
 to_underlying(_Tp __val) noexcept {
diff --git a/third_party/llvm-project/libcxx/include/__utility/unreachable.h b/third_party/llvm-project/libcxx/include/__utility/unreachable.h
index d93e60b..bd1c6be 100644
--- a/third_party/llvm-project/libcxx/include/__utility/unreachable.h
+++ b/third_party/llvm-project/libcxx/include/__utility/unreachable.h
@@ -23,7 +23,7 @@
     __builtin_unreachable();
 }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 [[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void unreachable() { __libcpp_unreachable(); }
 
diff --git a/third_party/llvm-project/libcxx/include/__variant/monostate.h b/third_party/llvm-project/libcxx/include/__variant/monostate.h
index b3b4597..8fec340 100644
--- a/third_party/llvm-project/libcxx/include/__variant/monostate.h
+++ b/third_party/llvm-project/libcxx/include/__variant/monostate.h
@@ -21,19 +21,19 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 struct _LIBCPP_TEMPLATE_VIS monostate {};
 
 _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(monostate, monostate) noexcept { return true; }
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(monostate, monostate) noexcept {
   return strong_ordering::equal;
 }
 
-#  else // _LIBCPP_STD_VER > 17
+#  else // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(monostate, monostate) noexcept { return false; }
 
@@ -45,7 +45,7 @@
 
 _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(monostate, monostate) noexcept { return true; }
 
-#  endif // _LIBCPP_STD_VER > 17
+#  endif // _LIBCPP_STD_VER >= 20
 
 template <>
 struct _LIBCPP_TEMPLATE_VIS hash<monostate> {
@@ -57,7 +57,7 @@
   }
 };
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/__verbose_abort b/third_party/llvm-project/libcxx/include/__verbose_abort
index a16d75d..048d9ff 100644
--- a/third_party/llvm-project/libcxx/include/__verbose_abort
+++ b/third_party/llvm-project/libcxx/include/__verbose_abort
@@ -21,7 +21,7 @@
 
 // This function should never be called directly from the code -- it should only be called through
 // the _LIBCPP_VERBOSE_ABORT macro.
-_LIBCPP_NORETURN _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2)
+_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2)
 void __libcpp_verbose_abort(const char *__format, ...);
 
 // _LIBCPP_VERBOSE_ABORT(format, args...)
@@ -40,16 +40,19 @@
 
 // Support _LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED until LLVM 18, but tell people
 // to move to customizing _LIBCPP_VERBOSE_ABORT instead.
-#  if defined(_LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY) && defined(_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED)
-#    undef _LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY
+#  if defined(_LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT) && defined(_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED)
+#    undef _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT
 #    warning _LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED is deprecated, please customize _LIBCPP_VERBOSE_ABORT instead
 #  endif
 
-#  if defined(_LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY)
-#    define _LIBCPP_VERBOSE_ABORT(...) __builtin_abort()
+#  if defined(_LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT)
+// The decltype is there to suppress -Wunused warnings in this configuration.
+_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR void __use(const char*, ...) { }
+#    define _LIBCPP_VERBOSE_ABORT(...) (decltype(::std::__use(__VA_ARGS__))(), __builtin_abort())
 #  else
 #    define _LIBCPP_VERBOSE_ABORT(...) ::std::__libcpp_verbose_abort(__VA_ARGS__)
 #  endif
+
 #endif // !defined(_LIBCPP_VERBOSE_ABORT)
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/include/algorithm b/third_party/llvm-project/libcxx/include/algorithm
index cb2d27c..9970a63 100644
--- a/third_party/llvm-project/libcxx/include/algorithm
+++ b/third_party/llvm-project/libcxx/include/algorithm
@@ -22,41 +22,41 @@
 
   // [algorithms.results], algorithm result types
   template <class I, class F>
-    struct in_fun_result;     // since C++20
+    struct in_fun_result;                // since C++20
 
   template <class I1, class I2>
-    struct in_in_result;      // since C++20
+    struct in_in_result;                 // since C++20
 
   template <class I, class O>
-    struct in_out_result;  // since C++20
+    struct in_out_result;                // since C++20
 
   template <class I1, class I2, class O>
-    struct in_in_out_result;  // since C++20
+    struct in_in_out_result;             // since C++20
 
   template <class I, class O1, class O2>
-    struct in_out_out_result; // since C++20
+    struct in_out_out_result;            // since C++20
 
   template <class I1, class I2>
-    struct min_max_result;    // since C++20
+    struct min_max_result;               // since C++20
 
   template <class I>
-    struct in_found_result;   // since C++20
+    struct in_found_result;              // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
-    indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>             // since C++20
+    indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>                                   // since C++20
   constexpr I min_element(I first, S last, Comp comp = {}, Proj proj = {});
 
   template<forward_range R, class Proj = identity,
-    indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less> // since C++20
+    indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>                       // since C++20
   constexpr borrowed_iterator_t<R> min_element(R&& r, Comp comp = {}, Proj proj = {});
 
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
     indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>
-  constexpr I ranges::max_element(I first, S last, Comp comp = {}, Proj proj = {});                        // since C++20
+  constexpr I ranges::max_element(I first, S last, Comp comp = {}, Proj proj = {});                       // since C++20
 
   template<forward_range R, class Proj = identity,
     indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
-  constexpr borrowed_iterator_t<R> ranges::max_element(R&& r, Comp comp = {}, Proj proj = {});             // since C++20
+  constexpr borrowed_iterator_t<R> ranges::max_element(R&& r, Comp comp = {}, Proj proj = {});            // since C++20
 
   template<class I1, class I2>
     using mismatch_result = in_in_result<I1, I2>;
@@ -64,86 +64,86 @@
   template <input_iterator I1, sentinel_for<_I1> S1, input_iterator I2, sentinel_for<_I2> S2,
           class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
     requires indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
-  constexpr mismatch_result<_I1, _I2>
-  mismatch()(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {}) // since C++20
+  constexpr mismatch_result<_I1, _I2>                                                                     // since C++20
+  mismatch()(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})
 
   template <input_range R1, input_range R2,
           class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
     requires indirectly_comparable<iterator_t<R1>, iterator_t<R2>, Pred, Proj1, Proj2>
   constexpr mismatch_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
-  mismatch(R1&& r1, R2&& r2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})                           // since C++20
+  mismatch(R1&& r1, R2&& r2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})                          // since C++20
 
     requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
-    constexpr I find(I first, S last, const T& value, Proj proj = {});              // since C++20
+    constexpr I find(I first, S last, const T& value, Proj proj = {});                                    // since C++20
 
   template<input_range R, class T, class Proj = identity>
     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
     constexpr borrowed_iterator_t<R>
-      find(R&& r, const T& value, Proj proj = {});                                  // since C++20
+      find(R&& r, const T& value, Proj proj = {});                                                        // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr I find_if(I first, S last, Pred pred, Proj proj = {});                // since C++20
+    constexpr I find_if(I first, S last, Pred pred, Proj proj = {});                                      // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     constexpr borrowed_iterator_t<R>
-      find_if(R&& r, Pred pred, Proj proj = {});                                    // since C++20
+      find_if(R&& r, Pred pred, Proj proj = {});                                                          // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr I find_if_not(I first, S last, Pred pred, Proj proj = {});            // since C++20
+    constexpr I find_if_not(I first, S last, Pred pred, Proj proj = {});                                  // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     constexpr borrowed_iterator_t<R>
-      find_if_not(R&& r, Pred pred, Proj proj = {});                                // since C++20
+      find_if_not(R&& r, Pred pred, Proj proj = {});                                                      // since C++20
 
   template<class T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
-    constexpr const T& min(const T& a, const T& b, Comp comp = {}, Proj proj = {}); // since C++20
+    constexpr const T& min(const T& a, const T& b, Comp comp = {}, Proj proj = {});                       // since C++20
 
   template<copyable T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
-    constexpr T min(initializer_list<T> r, Comp comp = {}, Proj proj = {});         // since C++20
+    constexpr T min(initializer_list<T> r, Comp comp = {}, Proj proj = {});                               // since C++20
 
  template<input_range R, class Proj = identity,
           indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
    requires indirectly_copyable_storable<iterator_t<R>, range_value_t<R>*>
    constexpr range_value_t<R>
-     min(R&& r, Comp comp = {}, Proj proj = {});                                    // since C++20
+     min(R&& r, Comp comp = {}, Proj proj = {});                                                          // since C++20
 
   template<class T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
-    constexpr const T& max(const T& a, const T& b, Comp comp = {}, Proj proj = {}); // since C++20
+    constexpr const T& max(const T& a, const T& b, Comp comp = {}, Proj proj = {});                       // since C++20
 
   template<copyable T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
-    constexpr T max(initializer_list<T> r, Comp comp = {}, Proj proj = {});         // since C++20
+    constexpr T max(initializer_list<T> r, Comp comp = {}, Proj proj = {});                               // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
     requires indirectly_copyable_storable<iterator_t<R>, range_value_t<R>*>
     constexpr range_value_t<R>
-      max(R&& r, Comp comp = {}, Proj proj = {});                                   // since C++20
+      max(R&& r, Comp comp = {}, Proj proj = {});                                                         // since C++20
 
   template<class I, class O>
-    using unary_transform_result = in_out_result<I, O>;                             // since C++20
+    using unary_transform_result = in_out_result<I, O>;                                                   // since C++20
 
   template<class I1, class I2, class O>
-    using binary_transform_result = in_in_out_result<I1, I2, O>;                    // since C++20
+    using binary_transform_result = in_in_out_result<I1, I2, O>;                                          // since C++20
 
   template<input_iterator I, sentinel_for<I> S, weakly_incrementable O,
            copy_constructible F, class Proj = identity>
     requires indirectly_writable<O, indirect_result_t<F&, projected<I, Proj>>>
     constexpr ranges::unary_transform_result<I, O>
-      transform(I first1, S last1, O result, F op, Proj proj = {});                 // since C++20
+      transform(I first1, S last1, O result, F op, Proj proj = {});                                       // since C++20
 
   template<input_range R, weakly_incrementable O, copy_constructible F,
            class Proj = identity>
     requires indirectly_writable<O, indirect_result_t<F&, projected<iterator_t<R>, Proj>>>
     constexpr ranges::unary_transform_result<borrowed_iterator_t<R>, O>
-      transform(R&& r, O result, F op, Proj proj = {});                             // since C++20
+      transform(R&& r, O result, F op, Proj proj = {});                                                   // since C++20
 
   template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2,
            weakly_incrementable O, copy_constructible F, class Proj1 = identity,
@@ -152,7 +152,7 @@
                                            projected<I2, Proj2>>>
     constexpr ranges::binary_transform_result<I1, I2, O>
       transform(I1 first1, S1 last1, I2 first2, S2 last2, O result,
-                        F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});           // since C++20
+                        F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});                                 // since C++20
 
   template<input_range R1, input_range R2, weakly_incrementable O,
            copy_constructible F, class Proj1 = identity, class Proj2 = identity>
@@ -160,27 +160,27 @@
                                            projected<iterator_t<R2>, Proj2>>>
     constexpr ranges::binary_transform_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>, O>
       transform(R1&& r1, R2&& r2, O result,
-                        F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});           // since C++20
+                        F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});                                 // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class T, class Proj = identity>
     requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
     constexpr iter_difference_t<I>
-      count(I first, S last, const T& value, Proj proj = {});                       // since C++20
+      count(I first, S last, const T& value, Proj proj = {});                                             // since C++20
 
   template<input_range R, class T, class Proj = identity>
     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
     constexpr range_difference_t<R>
-      count(R&& r, const T& value, Proj proj = {});                                 // since C++20
+      count(R&& r, const T& value, Proj proj = {});                                                       // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
     constexpr iter_difference_t<I>
-      count_if(I first, S last, Pred pred, Proj proj = {});                         // since C++20
+      count_if(I first, S last, Pred pred, Proj proj = {});                                               // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     constexpr range_difference_t<R>
-      count_if(R&& r, Pred pred, Proj proj = {});                                   // since C++20
+      count_if(R&& r, Pred pred, Proj proj = {});                                                         // since C++20
 
   template<class T>
   using minmax_result = min_max_result<T>;
@@ -188,18 +188,18 @@
   template<class T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
     constexpr ranges::minmax_result<const T&>
-      minmax(const T& a, const T& b, Comp comp = {}, Proj proj = {});                     // since C++20
+      minmax(const T& a, const T& b, Comp comp = {}, Proj proj = {});                                     // since C++20
 
   template<copyable T, class Proj = identity,
            indirect_strict_weak_order<projected<const T*, Proj>> Comp = ranges::less>
     constexpr ranges::minmax_result<T>
-      minmax(initializer_list<T> r, Comp comp = {}, Proj proj = {});                      // since C++20
+      minmax(initializer_list<T> r, Comp comp = {}, Proj proj = {});                                      // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
     requires indirectly_copyable_storable<iterator_t<R>, range_value_t<R>*>
     constexpr ranges::minmax_result<range_value_t<R>>
-      minmax(R&& r, Comp comp = {}, Proj proj = {});                                      // since C++20
+      minmax(R&& r, Comp comp = {}, Proj proj = {});                                                      // since C++20
 
   template<class I>
   using minmax_element_result = min_max_result<I>;
@@ -207,18 +207,18 @@
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>
     constexpr ranges::minmax_element_result<I>
-      minmax_element(I first, S last, Comp comp = {}, Proj proj = {});                    // since C++20
+      minmax_element(I first, S last, Comp comp = {}, Proj proj = {});                                    // since C++20
 
   template<forward_range R, class Proj = identity,
            indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
     constexpr ranges::minmax_element_result<borrowed_iterator_t<R>>
-      minmax_element(R&& r, Comp comp = {}, Proj proj = {});                              // since C++20
+      minmax_element(R&& r, Comp comp = {}, Proj proj = {});                                              // since C++20
 
   template<class I, class O>
-    using copy_result = in_out_result<I, O>;                                              // since C++20
+    using copy_result = in_out_result<I, O>;                                                // since C++20
 
   template<class I, class O>
-    using copy_n_result = in_out_result<I, O>;                                            // since C++20
+    using copy_n_result = in_out_result<I, O>;                                              // since C++20
 
   template<class I, class O>
     using copy_if_result = in_out_result<I, O>;                                             // since C++20
@@ -333,20 +333,20 @@
 
   template<random_access_iterator I, sentinel_for<I> S, class Proj = identity,
             indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>
-    constexpr bool is_heap(I first, S last, Comp comp = {}, Proj proj = {});                // Since C++20
+    constexpr bool is_heap(I first, S last, Comp comp = {}, Proj proj = {});                // since C++20
 
   template<random_access_range R, class Proj = identity,
             indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
-    constexpr bool is_heap(R&& r, Comp comp = {}, Proj proj = {});                          // Since C++20
+    constexpr bool is_heap(R&& r, Comp comp = {}, Proj proj = {});                          // since C++20
 
   template<random_access_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>
-    constexpr I is_heap_until(I first, S last, Comp comp = {}, Proj proj = {});             // Since C++20
+    constexpr I is_heap_until(I first, S last, Comp comp = {}, Proj proj = {});             // since C++20
 
   template<random_access_range R, class Proj = identity,
            indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less>
     constexpr borrowed_iterator_t<R>
-      is_heap_until(R&& r, Comp comp = {}, Proj proj = {});                                 // Since C++20
+      is_heap_until(R&& r, Comp comp = {}, Proj proj = {});                                 // since C++20
 
   template<bidirectional_iterator I, sentinel_for<I> S>
     requires permutable<I>
@@ -399,15 +399,15 @@
 
   template<input_or_output_iterator O, sentinel_for<O> S, copy_constructible F>
     requires invocable<F&> && indirectly_writable<O, invoke_result_t<F&>>
-    constexpr O generate(O first, S last, F gen);                                           // Since C++20
+    constexpr O generate(O first, S last, F gen);                                           // since C++20
 
   template<class R, copy_constructible F>
     requires invocable<F&> && output_range<R, invoke_result_t<F&>>
-    constexpr borrowed_iterator_t<R> generate(R&& r, F gen);                                // Since C++20
+    constexpr borrowed_iterator_t<R> generate(R&& r, F gen);                                // since C++20
 
   template<input_or_output_iterator O, copy_constructible F>
     requires invocable<F&> && indirectly_writable<O, invoke_result_t<F&>>
-    constexpr O generate_n(O first, iter_difference_t<O> n, F gen);                         // Since C++20
+    constexpr O generate_n(O first, iter_difference_t<O> n, F gen);                         // since C++20
 
  template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2,
           class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
@@ -424,27 +424,27 @@
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr bool ranges::all_of(I first, S last, Pred pred, Proj proj = {});      // since C++20
+    constexpr bool ranges::all_of(I first, S last, Pred pred, Proj proj = {});              // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
-    constexpr bool ranges::all_of(R&& r, Pred pred, Proj proj = {});                // since C++20
+    constexpr bool ranges::all_of(R&& r, Pred pred, Proj proj = {});                        // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr bool ranges::any_of(I first, S last, Pred pred, Proj proj = {});      // since C++20
+    constexpr bool ranges::any_of(I first, S last, Pred pred, Proj proj = {});              // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
-    constexpr bool ranges::any_of(R&& r, Pred pred, Proj proj = {});                // since C++20
+    constexpr bool ranges::any_of(R&& r, Pred pred, Proj proj = {});                        // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr bool ranges::none_of(I first, S last, Pred pred, Proj proj = {});     // since C++20
+    constexpr bool ranges::none_of(I first, S last, Pred pred, Proj proj = {});             // since C++20
 
   template<input_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
-    constexpr bool ranges::none_of(R&& r, Pred pred, Proj proj = {});               // since C++20
+    constexpr bool ranges::none_of(R&& r, Pred pred, Proj proj = {});                       // since C++20
 
   template<input_iterator I1, sentinel_for<I1> S1,
           random_access_iterator I2, sentinel_for<I2> S2,
@@ -453,7 +453,7 @@
             indirect_strict_weak_order<Comp, projected<I1, Proj1>, projected<I2, Proj2>>
     constexpr partial_sort_copy_result<I1, I2>
       partial_sort_copy(I1 first, S1 last, I2 result_first, S2 result_last,
-                        Comp comp = {}, Proj1 proj1 = {}, Proj2 proj2 = {});        // Since C++20
+                        Comp comp = {}, Proj1 proj1 = {}, Proj2 proj2 = {});                // since C++20
 
   template<input_range R1, random_access_range R2, class Comp = ranges::less,
           class Proj1 = identity, class Proj2 = identity>
@@ -463,7 +463,7 @@
                                         projected<iterator_t<R2>, Proj2>>
     constexpr partial_sort_copy_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
       partial_sort_copy(R1&& r, R2&& result_r, Comp comp = {},
-                        Proj1 proj1 = {}, Proj2 proj2 = {});                        // Since C++20
+                        Proj1 proj1 = {}, Proj2 proj2 = {});                                // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_strict_weak_order<projected<I, Proj>> Comp = ranges::less>
@@ -486,64 +486,64 @@
           class Proj = identity>
     requires sortable<I, Comp, Proj>
     constexpr I
-      ranges::nth_element(I first, I nth, S last, Comp comp = {}, Proj proj = {});            // since C++20
+      ranges::nth_element(I first, I nth, S last, Comp comp = {}, Proj proj = {});          // since C++20
 
   template<random_access_range R, class Comp = ranges::less, class Proj = identity>
     requires sortable<iterator_t<R>, Comp, Proj>
     constexpr borrowed_iterator_t<R>
-      ranges::nth_element(R&& r, iterator_t<R> nth, Comp comp = {}, Proj proj = {});          // since C++20
+      ranges::nth_element(R&& r, iterator_t<R> nth, Comp comp = {}, Proj proj = {});        // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class T, class Proj = identity,
-           indirect_strict_weak_order<const T*, projected<I, Proj>> Comp = ranges::less>
-    constexpr I upper_bound(I first, S last, const T& value, Comp comp = {}, Proj proj = {}); // since C++20
+           indirect_strict_weak_order<const T*, projected<I, Proj>> Comp = ranges::less>    // since C++20
+    constexpr I upper_bound(I first, S last, const T& value, Comp comp = {}, Proj proj = {});
 
   template<forward_range R, class T, class Proj = identity,
            indirect_strict_weak_order<const T*, projected<iterator_t<R>, Proj>> Comp =
              ranges::less>
     constexpr borrowed_iterator_t<R>
-      upper_bound(R&& r, const T& value, Comp comp = {}, Proj proj = {});                     // since C++20
+      upper_bound(R&& r, const T& value, Comp comp = {}, Proj proj = {});                   // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class T, class Proj = identity,
            indirect_strict_weak_order<const T*, projected<I, Proj>> Comp = ranges::less>
     constexpr I lower_bound(I first, S last, const T& value, Comp comp = {},
-                                    Proj proj = {});                                          // since C++20
+                                    Proj proj = {});                                        // since C++20
   template<forward_range R, class T, class Proj = identity,
            indirect_strict_weak_order<const T*, projected<iterator_t<R>, Proj>> Comp =
              ranges::less>
     constexpr borrowed_iterator_t<R>
-      lower_bound(R&& r, const T& value, Comp comp = {}, Proj proj = {});                     // since C++20
+      lower_bound(R&& r, const T& value, Comp comp = {}, Proj proj = {});                   // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class T, class Proj = identity,
            indirect_strict_weak_order<const T*, projected<I, Proj>> Comp = ranges::less>
     constexpr bool binary_search(I first, S last, const T& value, Comp comp = {},
-                                         Proj proj = {});                                     // since C++20
+                                         Proj proj = {});                                   // since C++20
 
   template<forward_range R, class T, class Proj = identity,
            indirect_strict_weak_order<const T*, projected<iterator_t<R>, Proj>> Comp =
              ranges::less>
     constexpr bool binary_search(R&& r, const T& value, Comp comp = {},
-                                         Proj proj = {});                                     // since C++20
+                                         Proj proj = {});                                   // since C++20
 
   template<permutable I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
     constexpr subrange<I>
-      partition(I first, S last, Pred pred, Proj proj = {});                                  // Since C++20
+      partition(I first, S last, Pred pred, Proj proj = {});                                // since C++20
 
   template<forward_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     requires permutable<iterator_t<R>>
     constexpr borrowed_subrange_t<R>
-      partition(R&& r, Pred pred, Proj proj = {});                                            // Since C++20
+      partition(R&& r, Pred pred, Proj proj = {});                                          // since C++20
 
   template<bidirectional_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
     requires permutable<I>
-    subrange<I> stable_partition(I first, S last, Pred pred, Proj proj = {});                 // Since C++20
+    subrange<I> stable_partition(I first, S last, Pred pred, Proj proj = {});               // since C++20
 
   template<bidirectional_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     requires permutable<iterator_t<R>>
-    borrowed_subrange_t<R> stable_partition(R&& r, Pred pred, Proj proj = {});                // Since C++20
+    borrowed_subrange_t<R> stable_partition(R&& r, Pred pred, Proj proj = {});              // since C++20
 
   template<input_iterator I1, sentinel_for<I1> S1, forward_iterator I2, sentinel_for<I2> S2,
            class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
@@ -563,7 +563,7 @@
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_binary_predicate<projected<I, Proj>,
                                      projected<I, Proj>> Pred = ranges::equal_to>
-    constexpr I ranges::adjacent_find(I first, S last, Pred pred = {}, Proj proj = {});     // since C+20
+    constexpr I ranges::adjacent_find(I first, S last, Pred pred = {}, Proj proj = {});     // since C++20
 
   template<forward_range R, class Proj = identity,
            indirect_binary_predicate<projected<iterator_t<R>, Proj>,
@@ -604,7 +604,7 @@
                                       projected<I2, Proj2>> Comp = ranges::less>
     constexpr bool
       ranges::lexicographical_compare(I1 first1, S1 last1, I2 first2, S2 last2,
-                                      Comp comp = {}, Proj1 proj1 = {}, Proj2 proj2 = {});    // since C++20
+                                      Comp comp = {}, Proj1 proj1 = {}, Proj2 proj2 = {});          // since C++20
 
   template<input_range R1, input_range R2, class Proj1 = identity,
            class Proj2 = identity,
@@ -612,7 +612,7 @@
                                       projected<iterator_t<R2>, Proj2>> Comp = ranges::less>
     constexpr bool
       ranges::lexicographical_compare(R1&& r1, R2&& r2, Comp comp = {},
-                                      Proj1 proj1 = {}, Proj2 proj2 = {});                    // since C++20
+                                      Proj1 proj1 = {}, Proj2 proj2 = {});                          // since C++20
 
   template<bidirectional_iterator I1, sentinel_for<I1> S1, bidirectional_iterator I2>
     requires indirectly_movable<I1, I2>
@@ -643,7 +643,7 @@
     requires indirectly_copyable<I, O1> && indirectly_copyable<I, O2>
     constexpr partition_copy_result<I, O1, O2>
       partition_copy(I first, S last, O1 out_true, O2 out_false, Pred pred,
-                    Proj proj = {});                                                                // Since C++20
+                    Proj proj = {});                                                                // since C++20
 
   template<input_range R, weakly_incrementable O1, weakly_incrementable O2,
           class Proj = identity,
@@ -651,16 +651,16 @@
     requires indirectly_copyable<iterator_t<R>, O1> &&
             indirectly_copyable<iterator_t<R>, O2>
     constexpr partition_copy_result<borrowed_iterator_t<R>, O1, O2>
-      partition_copy(R&& r, O1 out_true, O2 out_false, Pred pred, Proj proj = {});                  // Since C++20
+      partition_copy(R&& r, O1 out_true, O2 out_false, Pred pred, Proj proj = {});                  // since C++20
 
   template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
            indirect_unary_predicate<projected<I, Proj>> Pred>
-    constexpr I partition_point(I first, S last, Pred pred, Proj proj = {});                        // Since C++20
+    constexpr I partition_point(I first, S last, Pred pred, Proj proj = {});                        // since C++20
 
   template<forward_range R, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     constexpr borrowed_iterator_t<R>
-      partition_point(R&& r, Pred pred, Proj proj = {});                                            // Since C++20
+      partition_point(R&& r, Pred pred, Proj proj = {});                                            // since C++20
 
   template<class I1, class I2, class O>
     using merge_result = in_in_out_result<I1, I2, O>;                                               // since C++20
@@ -755,7 +755,7 @@
 
   template<forward_range R>
     requires permutable<iterator_t<R>>
-    constexpr borrowed_subrange_t<R> rotate(R&& r, iterator_t<R> middle);                           // Since C++20
+    constexpr borrowed_subrange_t<R> rotate(R&& r, iterator_t<R> middle);                           // since C++20
 
   template <class _InIter, class _OutIter>
   using rotate_copy_result = in_out_result<_InIter, _OutIter>;                                      // since C++20
@@ -774,23 +774,23 @@
     requires (forward_iterator<I> || random_access_iterator<O>) &&
             indirectly_copyable<I, O> &&
             uniform_random_bit_generator<remove_reference_t<Gen>>
-    O sample(I first, S last, O out, iter_difference_t<I> n, Gen&& g);                              // Since C++20
+    O sample(I first, S last, O out, iter_difference_t<I> n, Gen&& g);                              // since C++20
 
   template<input_range R, weakly_incrementable O, class Gen>
     requires (forward_range<R> || random_access_iterator<O>) &&
             indirectly_copyable<iterator_t<R>, O> &&
             uniform_random_bit_generator<remove_reference_t<Gen>>
-    O sample(R&& r, O out, range_difference_t<R> n, Gen&& g);                                       // Since C++20
+    O sample(R&& r, O out, range_difference_t<R> n, Gen&& g);                                       // since C++20
 
   template<random_access_iterator I, sentinel_for<I> S, class Gen>
     requires permutable<I> &&
             uniform_random_bit_generator<remove_reference_t<Gen>>
-    I shuffle(I first, S last, Gen&& g);                                                           // Since C++20
+    I shuffle(I first, S last, Gen&& g);                                                            // since C++20
 
   template<random_access_range R, class Gen>
     requires permutable<iterator_t<R>> &&
             uniform_random_bit_generator<remove_reference_t<Gen>>
-    borrowed_iterator_t<R> shuffle(R&& r, Gen&& g);                                                // Since C++20
+    borrowed_iterator_t<R> shuffle(R&& r, Gen&& g);                                                 // since C++20
 
   template<forward_iterator I1, sentinel_for<I1> S1, forward_iterator I2,
          sentinel_for<I2> S2, class Proj1 = identity, class Proj2 = identity,
@@ -798,14 +798,14 @@
                                        projected<I2, Proj2>> Pred = ranges::equal_to>
   constexpr bool ranges::is_permutation(I1 first1, S1 last1, I2 first2, S2 last2,
                                         Pred pred = {},
-                                        Proj1 proj1 = {}, Proj2 proj2 = {});                       // Since C++20
+                                        Proj1 proj1 = {}, Proj2 proj2 = {});                       // since C++20
 
   template<forward_range R1, forward_range R2,
          class Proj1 = identity, class Proj2 = identity,
          indirect_equivalence_relation<projected<iterator_t<R1>, Proj1>,
                                        projected<iterator_t<R2>, Proj2>> Pred = ranges::equal_to>
   constexpr bool ranges::is_permutation(R1&& r1, R2&& r2, Pred pred = {},
-                                        Proj1 proj1 = {}, Proj2 proj2 = {});                       // Since C++20
+                                        Proj1 proj1 = {}, Proj2 proj2 = {});                       // since C++20
 
   template<forward_iterator I1, sentinel_for<I1> S1, forward_iterator I2,
            sentinel_for<I2> S2, class Pred = ranges::equal_to,
@@ -904,35 +904,35 @@
            indirect_strict_weak_order<projected<I1, Proj1>, projected<I2, Proj2>> Comp =
              ranges::less>
     constexpr bool includes(I1 first1, S1 last1, I2 first2, S2 last2, Comp comp = {},
-                            Proj1 proj1 = {}, Proj2 proj2 = {});                                   // Since C++20
+                            Proj1 proj1 = {}, Proj2 proj2 = {});                                   // since C++20
 
   template<input_range R1, input_range R2, class Proj1 = identity,
            class Proj2 = identity,
            indirect_strict_weak_order<projected<iterator_t<R1>, Proj1>,
                                       projected<iterator_t<R2>, Proj2>> Comp = ranges::less>
     constexpr bool includes(R1&& r1, R2&& r2, Comp comp = {},
-                            Proj1 proj1 = {}, Proj2 proj2 = {});                                   // Since C++20
+                            Proj1 proj1 = {}, Proj2 proj2 = {});                                   // since C++20
 
   template<bidirectional_iterator I, sentinel_for<I> S, class Comp = ranges::less,
            class Proj = identity>
     requires sortable<I, Comp, Proj>
-    I inplace_merge(I first, I middle, S last, Comp comp = {}, Proj proj = {});                    // Since C++20
+    I inplace_merge(I first, I middle, S last, Comp comp = {}, Proj proj = {});                    // since C++20
 
   template<bidirectional_range R, class Comp = ranges::less, class Proj = identity>
     requires sortable<iterator_t<R>, Comp, Proj>
     borrowed_iterator_t<R>
       inplace_merge(R&& r, iterator_t<R> middle, Comp comp = {},
-                    Proj proj = {});                                                               // Since C++20
+                    Proj proj = {});                                                               // since C++20
 
   template<permutable I, sentinel_for<I> S, class Proj = identity,
            indirect_equivalence_relation<projected<I, Proj>> C = ranges::equal_to>
-    constexpr subrange<I> unique(I first, S last, C comp = {}, Proj proj = {});                    // Since C++20
+    constexpr subrange<I> unique(I first, S last, C comp = {}, Proj proj = {});                    // since C++20
 
   template<forward_range R, class Proj = identity,
            indirect_equivalence_relation<projected<iterator_t<R>, Proj>> C = ranges::equal_to>
     requires permutable<iterator_t<R>>
     constexpr borrowed_subrange_t<R>
-      unique(R&& r, C comp = {}, Proj proj = {});                                                  // Since C++20
+      unique(R&& r, C comp = {}, Proj proj = {});                                                  // since C++20
 
   template<input_iterator I, sentinel_for<I> S, weakly_incrementable O, class Proj = identity,
            indirect_equivalence_relation<projected<I, Proj>> C = ranges::equal_to>
@@ -941,7 +941,7 @@
               (input_iterator<O> && same_as<iter_value_t<I>, iter_value_t<O>>) ||
               indirectly_copyable_storable<I, O>)
     constexpr unique_copy_result<I, O>
-      unique_copy(I first, S last, O result, C comp = {}, Proj proj = {});                         // Since C++20
+      unique_copy(I first, S last, O result, C comp = {}, Proj proj = {});                         // since C++20
 
   template<input_range R, weakly_incrementable O, class Proj = identity,
            indirect_equivalence_relation<projected<iterator_t<R>, Proj>> C = ranges::equal_to>
@@ -950,41 +950,41 @@
               (input_iterator<O> && same_as<range_value_t<R>, iter_value_t<O>>) ||
               indirectly_copyable_storable<iterator_t<R>, O>)
     constexpr unique_copy_result<borrowed_iterator_t<R>, O>
-      unique_copy(R&& r, O result, C comp = {}, Proj proj = {});                                   // Since C++20
+      unique_copy(R&& r, O result, C comp = {}, Proj proj = {});                                   // since C++20
 
   template<class I, class O>
-      using remove_copy_result = in_out_result<I, O>;                                              // Since C++20
+      using remove_copy_result = in_out_result<I, O>;                                              // since C++20
 
   template<input_iterator I, sentinel_for<I> S, weakly_incrementable O, class T,
            class Proj = identity>
              indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
     constexpr remove_copy_result<I, O>
-      remove_copy(I first, S last, O result, const T& value, Proj proj = {});                      // Since C++20
+      remove_copy(I first, S last, O result, const T& value, Proj proj = {});                      // since C++20
 
   template<input_range R, weakly_incrementable O, class T, class Proj = identity>
     requires indirectly_copyable<iterator_t<R>, O> &&
              indirect_binary_predicate<ranges::equal_to,
                                        projected<iterator_t<R>, Proj>, const T*>
     constexpr remove_copy_result<borrowed_iterator_t<R>, O>
-      remove_copy(R&& r, O result, const T& value, Proj proj = {});                                // Since C++20
+      remove_copy(R&& r, O result, const T& value, Proj proj = {});                                // since C++20
 
   template<class I, class O>
-      using remove_copy_if_result = in_out_result<I, O>;                                           // Since C++20
+      using remove_copy_if_result = in_out_result<I, O>;                                           // since C++20
 
   template<input_iterator I, sentinel_for<I> S, weakly_incrementable O,
            class Proj = identity, indirect_unary_predicate<projected<I, Proj>> Pred>
     requires indirectly_copyable<I, O>
     constexpr remove_copy_if_result<I, O>
-      remove_copy_if(I first, S last, O result, Pred pred, Proj proj = {});                        // Since C++20
+      remove_copy_if(I first, S last, O result, Pred pred, Proj proj = {});                        // since C++20
 
   template<input_range R, weakly_incrementable O, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     requires indirectly_copyable<iterator_t<R>, O>
     constexpr remove_copy_if_result<borrowed_iterator_t<R>, O>
-      remove_copy_if(R&& r, O result, Pred pred, Proj proj = {});                                  // Since C++20
+      remove_copy_if(R&& r, O result, Pred pred, Proj proj = {});                                  // since C++20
 
   template<class I, class O>
-      using replace_copy_result = in_out_result<I, O>;                                             // Since C++20
+      using replace_copy_result = in_out_result<I, O>;                                             // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class T1, class T2,
            output_iterator<const T2&> O, class Proj = identity>
@@ -992,7 +992,7 @@
              indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T1*>
     constexpr replace_copy_result<I, O>
       replace_copy(I first, S last, O result, const T1& old_value, const T2& new_value,
-                   Proj proj = {});                                                                // Since C++20
+                   Proj proj = {});                                                                // since C++20
 
   template<input_range R, class T1, class T2, output_iterator<const T2&> O,
            class Proj = identity>
@@ -1001,54 +1001,54 @@
                                        projected<iterator_t<R>, Proj>, const T1*>
     constexpr replace_copy_result<borrowed_iterator_t<R>, O>
       replace_copy(R&& r, O result, const T1& old_value, const T2& new_value,
-                   Proj proj = {});                                                                // Since C++20
+                   Proj proj = {});                                                                // since C++20
 
   template<class I, class O>
-      using replace_copy_if_result = in_out_result<I, O>;                                          // Since C++20
+      using replace_copy_if_result = in_out_result<I, O>;                                          // since C++20
 
   template<input_iterator I, sentinel_for<I> S, class T, output_iterator<const T&> O,
            class Proj = identity, indirect_unary_predicate<projected<I, Proj>> Pred>
     requires indirectly_copyable<I, O>
     constexpr replace_copy_if_result<I, O>
       replace_copy_if(I first, S last, O result, Pred pred, const T& new_value,
-                      Proj proj = {});                                                             // Since C++20
+                      Proj proj = {});                                                             // since C++20
 
   template<input_range R, class T, output_iterator<const T&> O, class Proj = identity,
            indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
     requires indirectly_copyable<iterator_t<R>, O>
     constexpr replace_copy_if_result<borrowed_iterator_t<R>, O>
       replace_copy_if(R&& r, O result, Pred pred, const T& new_value,
-                      Proj proj = {});                                                             // Since C++20
+                      Proj proj = {});                                                             // since C++20
 
   template<class I>
-    using prev_permutation_result = in_found_result<I>;                                            // Since C++20
+    using prev_permutation_result = in_found_result<I>;                                            // since C++20
 
   template<bidirectional_iterator I, sentinel_for<I> S, class Comp = ranges::less,
            class Proj = identity>
     requires sortable<I, Comp, Proj>
     constexpr ranges::prev_permutation_result<I>
-      ranges::prev_permutation(I first, S last, Comp comp = {}, Proj proj = {});                   // Since C++20
+      ranges::prev_permutation(I first, S last, Comp comp = {}, Proj proj = {});                   // since C++20
 
   template<bidirectional_range R, class Comp = ranges::less,
            class Proj = identity>
     requires sortable<iterator_t<R>, Comp, Proj>
     constexpr ranges::prev_permutation_result<borrowed_iterator_t<R>>
-      ranges::prev_permutation(R&& r, Comp comp = {}, Proj proj = {});                             // Since C++20
+      ranges::prev_permutation(R&& r, Comp comp = {}, Proj proj = {});                             // since C++20
 
   template<class I>
-    using next_permutation_result = in_found_result<I>;                                            // Since C++20
+    using next_permutation_result = in_found_result<I>;                                            // since C++20
 
   template<bidirectional_iterator I, sentinel_for<I> S, class Comp = ranges::less,
            class Proj = identity>
     requires sortable<I, Comp, Proj>
     constexpr ranges::next_permutation_result<I>
-      ranges::next_permutation(I first, S last, Comp comp = {}, Proj proj = {});                   // Since C++20
+      ranges::next_permutation(I first, S last, Comp comp = {}, Proj proj = {});                   // since C++20
 
   template<bidirectional_range R, class Comp = ranges::less,
            class Proj = identity>
     requires sortable<iterator_t<R>, Comp, Proj>
     constexpr ranges::next_permutation_result<borrowed_iterator_t<R>>
-      ranges::next_permutation(R&& r, Comp comp = {}, Proj proj = {});                             // Since C++20
+      ranges::next_permutation(R&& r, Comp comp = {}, Proj proj = {});                             // since C++20
 
 }
 
@@ -1684,6 +1684,18 @@
     lexicographical_compare(InputIterator1 first1, InputIterator1 last1,
                             InputIterator2 first2, InputIterator2 last2, Compare comp);
 
+template<class InputIterator1, class InputIterator2, class Cmp>
+    constexpr auto
+    lexicographical_compare_three_way(InputIterator1 first1, InputIterator1 last1,
+                                      InputIterator2 first2, InputIterator2 last2,
+                                      Cmp comp)
+      -> decltype(comp(*b1, *b2));                                                        // since C++20
+
+template<class InputIterator1, class InputIterator2>
+    constexpr auto
+    lexicographical_compare_three_way(InputIterator1 first1, InputIterator1 last1,
+                                      InputIterator2 first2, InputIterator2 last2);      // since C++20
+
 template <class BidirectionalIterator>
     constexpr bool     // constexpr in C++20
     next_permutation(BidirectionalIterator first, BidirectionalIterator last);
@@ -1707,7 +1719,6 @@
 #include <__config>
 #include <__debug>
 #include <cstddef>
-#include <type_traits>
 #include <version>
 
 #include <__algorithm/adjacent_find.h>
@@ -1753,6 +1764,7 @@
 #include <__algorithm/is_sorted_until.h>
 #include <__algorithm/iter_swap.h>
 #include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/lexicographical_compare_three_way.h>
 #include <__algorithm/lower_bound.h>
 #include <__algorithm/make_heap.h>
 #include <__algorithm/max.h>
@@ -1915,11 +1927,14 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
+#  include <bit>
 #  include <concepts>
+#  include <cstdlib>
 #  include <cstring>
 #  include <iterator>
 #  include <memory>
 #  include <stdexcept>
+#  include <type_traits>
 #  include <utility>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/any b/third_party/llvm-project/libcxx/include/any
index 92cbc9a..963e5e0 100644
--- a/third_party/llvm-project/libcxx/include/any
+++ b/third_party/llvm-project/libcxx/include/any
@@ -87,13 +87,27 @@
 #include <__memory/allocator_destructor.h>
 #include <__memory/allocator_traits.h>
 #include <__memory/unique_ptr.h>
+#include <__type_traits/add_const.h>
+#include <__type_traits/add_pointer.h>
+#include <__type_traits/aligned_storage.h>
+#include <__type_traits/alignment_of.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
-#include <cstdlib>
+#include <__verbose_abort>
 #include <initializer_list>
-#include <type_traits>
 #include <typeinfo>
 #include <version>
 
@@ -111,16 +125,16 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
 void __throw_bad_any_cast()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_any_cast();
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_any_cast was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -175,7 +189,7 @@
   inline _LIBCPP_INLINE_VISIBILITY
   bool __compare_typeid(type_info const* __id, const void* __fallback_id)
   {
-#if !defined(_LIBCPP_NO_RTTI)
+#if !defined(_LIBCPP_HAS_NO_RTTI)
       if (__id && *__id == typeid(_Tp))
           return true;
 #endif
@@ -294,7 +308,7 @@
   _LIBCPP_INLINE_VISIBILITY
   bool has_value() const _NOEXCEPT { return __h_ != nullptr; }
 
-#if !defined(_LIBCPP_NO_RTTI)
+#if !defined(_LIBCPP_HAS_NO_RTTI)
   _LIBCPP_INLINE_VISIBILITY
   const type_info & type() const _NOEXCEPT {
     if (__h_) {
@@ -426,7 +440,7 @@
     _LIBCPP_INLINE_VISIBILITY
     static void* __type_info()
     {
-#if !defined(_LIBCPP_NO_RTTI)
+#if !defined(_LIBCPP_HAS_NO_RTTI)
         return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
 #else
         return nullptr;
@@ -514,7 +528,7 @@
     _LIBCPP_INLINE_VISIBILITY
     static void* __type_info()
     {
-#if !defined(_LIBCPP_NO_RTTI)
+#if !defined(_LIBCPP_HAS_NO_RTTI)
         return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
 #else
         return nullptr;
@@ -680,7 +694,7 @@
     typedef add_pointer_t<_ValueType> _ReturnType;
     if (__any && __any->__h_) {
       void *__p = __any->__call(_Action::_Get, nullptr,
-#if !defined(_LIBCPP_NO_RTTI)
+#if !defined(_LIBCPP_HAS_NO_RTTI)
                           &typeid(_ValueType),
 #else
                           nullptr,
@@ -692,7 +706,7 @@
     return nullptr;
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
@@ -703,9 +717,11 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iosfwd>
 #  include <iterator>
 #  include <memory>
+#  include <type_traits>
 #  include <variant>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/array b/third_party/llvm-project/libcxx/include/array
index 068a6bd..cdabc06 100644
--- a/third_party/llvm-project/libcxx/include/array
+++ b/third_party/llvm-project/libcxx/include/array
@@ -115,12 +115,21 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__iterator/reverse_iterator.h>
-#include <__tuple_dir/sfinae_helpers.h>
+#include <__tuple/sfinae_helpers.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_const.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_move_constructible.h>
+#include <__type_traits/is_nothrow_constructible.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_swappable.h>
+#include <__type_traits/remove_cv.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -137,8 +146,8 @@
 #include <initializer_list>
 
 // [tuple.helper]
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -376,7 +385,7 @@
 };
 
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Tp, class... _Args,
          class = enable_if_t<__all<_IsSame<_Tp, _Args>::value...>::value>
          >
@@ -489,7 +498,7 @@
     return _VSTD::move(__a.__elems_[_Ip]);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <typename _Tp, size_t _Size, size_t... _Index>
 _LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
@@ -528,14 +537,16 @@
                                        make_index_sequence<_Size>());
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <algorithm>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iterator>
+#  include <type_traits>
 #  include <utility>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/atomic b/third_party/llvm-project/libcxx/include/atomic
index d0d682d..2f122a7 100644
--- a/third_party/llvm-project/libcxx/include/atomic
+++ b/third_party/llvm-project/libcxx/include/atomic
@@ -519,2154 +519,39 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
-#include <__availability>
-#include <__chrono/duration.h>
+#include <__atomic/aliases.h>
+#include <__atomic/atomic.h>
+#include <__atomic/atomic_base.h>
+#include <__atomic/atomic_flag.h>
+#include <__atomic/atomic_init.h>
+#include <__atomic/atomic_lock_free.h>
+#include <__atomic/atomic_sync.h>
+#include <__atomic/check_memory_order.h>
+#include <__atomic/contention_t.h>
+#include <__atomic/cxx_atomic_impl.h>
+#include <__atomic/fence.h>
+#include <__atomic/is_always_lock_free.h>
+#include <__atomic/kill_dependency.h>
+#include <__atomic/memory_order.h>
 #include <__config>
-#include <__thread/poll_with_backoff.h>
-#include <__thread/timed_backoff_policy.h>
-#include <__type_traits/conditional.h>
-#include <__type_traits/decay.h>
-#include <__type_traits/is_assignable.h>
-#include <__type_traits/is_function.h>
-#include <__type_traits/is_nothrow_default_constructible.h>
-#include <__type_traits/is_same.h>
-#include <__type_traits/is_trivially_copyable.h>
-#include <__type_traits/remove_const.h>
-#include <__type_traits/remove_pointer.h>
-#include <__type_traits/underlying_type.h>
-#include <cstddef>
-#include <cstdint>
-#include <cstring>
 #include <version>
 
-#ifndef _LIBCPP_HAS_NO_THREADS
-# include <__threading_support>
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 #ifdef _LIBCPP_HAS_NO_ATOMIC_HEADER
-# error <atomic> is not implemented
+#  error <atomic> is not implemented
 #endif
+
 #ifdef kill_dependency
-# error <atomic> is incompatible with <stdatomic.h> before C++23. Please compile with -std=c++23.
+#  error <atomic> is incompatible with <stdatomic.h> before C++23. Please compile with -std=c++23.
 #endif
 
-#define _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) \
-  _LIBCPP_DIAGNOSE_WARNING(__m == memory_order_consume || \
-                           __m == memory_order_acquire || \
-                           __m == memory_order_acq_rel,   \
-                        "memory order argument to atomic operation is invalid")
-
-#define _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) \
-  _LIBCPP_DIAGNOSE_WARNING(__m == memory_order_release || \
-                           __m == memory_order_acq_rel,   \
-                        "memory order argument to atomic operation is invalid")
-
-#define _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__m, __f) \
-  _LIBCPP_DIAGNOSE_WARNING(__f == memory_order_release || \
-                           __f == memory_order_acq_rel,   \
-                        "memory order argument to atomic operation is invalid")
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-// Figure out what the underlying type for `memory_order` would be if it were
-// declared as an unscoped enum (accounting for -fshort-enums). Use this result
-// to pin the underlying type in C++20.
-enum __legacy_memory_order {
-    __mo_relaxed,
-    __mo_consume,
-    __mo_acquire,
-    __mo_release,
-    __mo_acq_rel,
-    __mo_seq_cst
-};
-
-typedef underlying_type<__legacy_memory_order>::type __memory_order_underlying_t;
-
-#if _LIBCPP_STD_VER > 17
-
-enum class memory_order : __memory_order_underlying_t {
-  relaxed = __mo_relaxed,
-  consume = __mo_consume,
-  acquire = __mo_acquire,
-  release = __mo_release,
-  acq_rel = __mo_acq_rel,
-  seq_cst = __mo_seq_cst
-};
-
-inline constexpr auto memory_order_relaxed = memory_order::relaxed;
-inline constexpr auto memory_order_consume = memory_order::consume;
-inline constexpr auto memory_order_acquire = memory_order::acquire;
-inline constexpr auto memory_order_release = memory_order::release;
-inline constexpr auto memory_order_acq_rel = memory_order::acq_rel;
-inline constexpr auto memory_order_seq_cst = memory_order::seq_cst;
-
-#else
-
-typedef enum memory_order {
-  memory_order_relaxed = __mo_relaxed,
-  memory_order_consume = __mo_consume,
-  memory_order_acquire = __mo_acquire,
-  memory_order_release = __mo_release,
-  memory_order_acq_rel = __mo_acq_rel,
-  memory_order_seq_cst = __mo_seq_cst,
-} memory_order;
-
-#endif // _LIBCPP_STD_VER > 17
-
-template <typename _Tp> _LIBCPP_INLINE_VISIBILITY
-bool __cxx_nonatomic_compare_equal(_Tp const& __lhs, _Tp const& __rhs) {
-    return _VSTD::memcmp(&__lhs, &__rhs, sizeof(_Tp)) == 0;
-}
-
-static_assert((is_same<underlying_type<memory_order>::type, __memory_order_underlying_t>::value),
-  "unexpected underlying type for std::memory_order");
-
-#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) || \
-    defined(_LIBCPP_ATOMIC_ONLY_USE_BUILTINS)
-
-// [atomics.types.generic]p1 guarantees _Tp is trivially copyable. Because
-// the default operator= in an object is not volatile, a byte-by-byte copy
-// is required.
-template <typename _Tp, typename _Tv> _LIBCPP_INLINE_VISIBILITY
-typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
-__cxx_atomic_assign_volatile(_Tp& __a_value, _Tv const& __val) {
-  __a_value = __val;
-}
-template <typename _Tp, typename _Tv> _LIBCPP_INLINE_VISIBILITY
-typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
-__cxx_atomic_assign_volatile(_Tp volatile& __a_value, _Tv volatile const& __val) {
-  volatile char* __to = reinterpret_cast<volatile char*>(&__a_value);
-  volatile char* __end = __to + sizeof(_Tp);
-  volatile const char* __from = reinterpret_cast<volatile const char*>(&__val);
-  while (__to != __end)
-    *__to++ = *__from++;
-}
-
-#endif
-
-#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP)
-
-template <typename _Tp>
-struct __cxx_atomic_base_impl {
-
-  _LIBCPP_INLINE_VISIBILITY
-#ifndef _LIBCPP_CXX03_LANG
-    __cxx_atomic_base_impl() _NOEXCEPT = default;
-#else
-    __cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
-#endif // _LIBCPP_CXX03_LANG
-  _LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp value) _NOEXCEPT
-    : __a_value(value) {}
-  _Tp __a_value;
-};
-
-_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
-  // Avoid switch statement to make this a constexpr.
-  return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
-         (__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
-          (__order == memory_order_release ? __ATOMIC_RELEASE:
-           (__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
-            (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL:
-              __ATOMIC_CONSUME))));
-}
-
-_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
-  // Avoid switch statement to make this a constexpr.
-  return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
-         (__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
-          (__order == memory_order_release ? __ATOMIC_RELAXED:
-           (__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
-            (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE:
-              __ATOMIC_CONSUME))));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(volatile __cxx_atomic_base_impl<_Tp>* __a,  _Tp __val) {
-  __cxx_atomic_assign_volatile(__a->__a_value, __val);
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp>* __a,  _Tp __val) {
-  __a->__a_value = __val;
-}
-
-_LIBCPP_INLINE_VISIBILITY inline
-void __cxx_atomic_thread_fence(memory_order __order) {
-  __atomic_thread_fence(__to_gcc_order(__order));
-}
-
-_LIBCPP_INLINE_VISIBILITY inline
-void __cxx_atomic_signal_fence(memory_order __order) {
-  __atomic_signal_fence(__to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(volatile __cxx_atomic_base_impl<_Tp>* __a,  _Tp __val,
-                        memory_order __order) {
-  __atomic_store(&__a->__a_value, &__val,
-                 __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp>* __a,  _Tp __val,
-                        memory_order __order) {
-  __atomic_store(&__a->__a_value, &__val,
-                 __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(const volatile __cxx_atomic_base_impl<_Tp>* __a,
-                      memory_order __order) {
-  _Tp __ret;
-  __atomic_load(&__a->__a_value, &__ret,
-                __to_gcc_order(__order));
-  return __ret;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(const __cxx_atomic_base_impl<_Tp>* __a, memory_order __order) {
-  _Tp __ret;
-  __atomic_load(&__a->__a_value, &__ret,
-                __to_gcc_order(__order));
-  return __ret;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                          _Tp __value, memory_order __order) {
-  _Tp __ret;
-  __atomic_exchange(&__a->__a_value, &__value, &__ret,
-                    __to_gcc_order(__order));
-  return __ret;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp>* __a, _Tp __value,
-                          memory_order __order) {
-  _Tp __ret;
-  __atomic_exchange(&__a->__a_value, &__value, &__ret,
-                    __to_gcc_order(__order));
-  return __ret;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(
-    volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
-    memory_order __success, memory_order __failure) {
-  return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
-                                   false,
-                                   __to_gcc_order(__success),
-                                   __to_gcc_failure_order(__failure));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(
-    __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
-    memory_order __failure) {
-  return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
-                                   false,
-                                   __to_gcc_order(__success),
-                                   __to_gcc_failure_order(__failure));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(
-    volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
-    memory_order __success, memory_order __failure) {
-  return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
-                                   true,
-                                   __to_gcc_order(__success),
-                                   __to_gcc_failure_order(__failure));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(
-    __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
-    memory_order __failure) {
-  return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
-                                   true,
-                                   __to_gcc_order(__success),
-                                   __to_gcc_failure_order(__failure));
-}
-
-template <typename _Tp>
-struct __skip_amt { enum {value = 1}; };
-
-template <typename _Tp>
-struct __skip_amt<_Tp*> { enum {value = sizeof(_Tp)}; };
-
-// FIXME: Haven't figured out what the spec says about using arrays with
-// atomic_fetch_add. Force a failure rather than creating bad behavior.
-template <typename _Tp>
-struct __skip_amt<_Tp[]> { };
-template <typename _Tp, int n>
-struct __skip_amt<_Tp[n]> { };
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                           _Td __delta, memory_order __order) {
-  return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
-                           memory_order __order) {
-  return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                           _Td __delta, memory_order __order) {
-  return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
-                           memory_order __order) {
-  return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order __order) {
-  return __atomic_fetch_and(&__a->__a_value, __pattern,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order __order) {
-  return __atomic_fetch_and(&__a->__a_value, __pattern,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                          _Tp __pattern, memory_order __order) {
-  return __atomic_fetch_or(&__a->__a_value, __pattern,
-                           __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
-                          memory_order __order) {
-  return __atomic_fetch_or(&__a->__a_value, __pattern,
-                           __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_base_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order __order) {
-  return __atomic_fetch_xor(&__a->__a_value, __pattern,
-                            __to_gcc_order(__order));
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
-                           memory_order __order) {
-  return __atomic_fetch_xor(&__a->__a_value, __pattern,
-                            __to_gcc_order(__order));
-}
-
-#define __cxx_atomic_is_lock_free(__s) __atomic_is_lock_free(__s, 0)
-
-#elif defined(_LIBCPP_HAS_C_ATOMIC_IMP)
-
-template <typename _Tp>
-struct __cxx_atomic_base_impl {
-
-  _LIBCPP_INLINE_VISIBILITY
-#ifndef _LIBCPP_CXX03_LANG
-    __cxx_atomic_base_impl() _NOEXCEPT = default;
-#else
-    __cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
-#endif // _LIBCPP_CXX03_LANG
-  _LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp __value) _NOEXCEPT
-    : __a_value(__value) {}
-  _LIBCPP_DISABLE_EXTENSION_WARNING _Atomic(_Tp) __a_value;
-};
-
-#define __cxx_atomic_is_lock_free(__s) __c11_atomic_is_lock_free(__s)
-
-_LIBCPP_INLINE_VISIBILITY inline
-void __cxx_atomic_thread_fence(memory_order __order) _NOEXCEPT {
-    __c11_atomic_thread_fence(static_cast<__memory_order_underlying_t>(__order));
-}
-
-_LIBCPP_INLINE_VISIBILITY inline
-void __cxx_atomic_signal_fence(memory_order __order) _NOEXCEPT {
-    __c11_atomic_signal_fence(static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val) _NOEXCEPT {
-    __c11_atomic_init(&__a->__a_value, __val);
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val) _NOEXCEPT {
-    __c11_atomic_init(&__a->__a_value, __val);
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val, memory_order __order) _NOEXCEPT {
-    __c11_atomic_store(&__a->__a_value, __val, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val, memory_order __order) _NOEXCEPT {
-    __c11_atomic_store(&__a->__a_value, __val, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const volatile* __a, memory_order __order) _NOEXCEPT {
-    using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
-    return __c11_atomic_load(const_cast<__ptr_type>(&__a->__a_value), static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const* __a, memory_order __order) _NOEXCEPT {
-    using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
-    return __c11_atomic_load(const_cast<__ptr_type>(&__a->__a_value), static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __value, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_exchange(&__a->__a_value, __value, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> * __a, _Tp __value, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_exchange(&__a->__a_value, __value, static_cast<__memory_order_underlying_t>(__order));
-}
-
-_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR memory_order __to_failure_order(memory_order __order) {
-  // Avoid switch statement to make this a constexpr.
-  return __order == memory_order_release ? memory_order_relaxed:
-         (__order == memory_order_acq_rel ? memory_order_acquire:
-             __order);
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
-    return __c11_atomic_compare_exchange_strong(&__a->__a_value, __expected, __value, static_cast<__memory_order_underlying_t>(__success), static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
-    return __c11_atomic_compare_exchange_strong(&__a->__a_value, __expected, __value, static_cast<__memory_order_underlying_t>(__success), static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
-    return __c11_atomic_compare_exchange_weak(&__a->__a_value, __expected, __value, static_cast<__memory_order_underlying_t>(__success), static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
-    return __c11_atomic_compare_exchange_weak(&__a->__a_value, __expected, __value,  static_cast<__memory_order_underlying_t>(__success), static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_add(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_add(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_add(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_add(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_sub(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_sub(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_sub(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_sub(&__a->__a_value, __delta, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_and(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_and(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_or(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_or(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_xor(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-template<class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
-    return __c11_atomic_fetch_xor(&__a->__a_value, __pattern, static_cast<__memory_order_underlying_t>(__order));
-}
-
-#endif // _LIBCPP_HAS_GCC_ATOMIC_IMP, _LIBCPP_HAS_C_ATOMIC_IMP
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp kill_dependency(_Tp __y) _NOEXCEPT
-{
-    return __y;
-}
-
-#if defined(__CLANG_ATOMIC_BOOL_LOCK_FREE)
-# define ATOMIC_BOOL_LOCK_FREE      __CLANG_ATOMIC_BOOL_LOCK_FREE
-# define ATOMIC_CHAR_LOCK_FREE      __CLANG_ATOMIC_CHAR_LOCK_FREE
-#ifndef _LIBCPP_HAS_NO_CHAR8_T
-# define ATOMIC_CHAR8_T_LOCK_FREE   __CLANG_ATOMIC_CHAR8_T_LOCK_FREE
-#endif
-# define ATOMIC_CHAR16_T_LOCK_FREE  __CLANG_ATOMIC_CHAR16_T_LOCK_FREE
-# define ATOMIC_CHAR32_T_LOCK_FREE  __CLANG_ATOMIC_CHAR32_T_LOCK_FREE
-# define ATOMIC_WCHAR_T_LOCK_FREE   __CLANG_ATOMIC_WCHAR_T_LOCK_FREE
-# define ATOMIC_SHORT_LOCK_FREE     __CLANG_ATOMIC_SHORT_LOCK_FREE
-# define ATOMIC_INT_LOCK_FREE       __CLANG_ATOMIC_INT_LOCK_FREE
-# define ATOMIC_LONG_LOCK_FREE      __CLANG_ATOMIC_LONG_LOCK_FREE
-# define ATOMIC_LLONG_LOCK_FREE     __CLANG_ATOMIC_LLONG_LOCK_FREE
-# define ATOMIC_POINTER_LOCK_FREE   __CLANG_ATOMIC_POINTER_LOCK_FREE
-#elif defined(__GCC_ATOMIC_BOOL_LOCK_FREE)
-# define ATOMIC_BOOL_LOCK_FREE      __GCC_ATOMIC_BOOL_LOCK_FREE
-# define ATOMIC_CHAR_LOCK_FREE      __GCC_ATOMIC_CHAR_LOCK_FREE
-#ifndef _LIBCPP_HAS_NO_CHAR8_T
-# define ATOMIC_CHAR8_T_LOCK_FREE   __GCC_ATOMIC_CHAR8_T_LOCK_FREE
-#endif
-# define ATOMIC_CHAR16_T_LOCK_FREE  __GCC_ATOMIC_CHAR16_T_LOCK_FREE
-# define ATOMIC_CHAR32_T_LOCK_FREE  __GCC_ATOMIC_CHAR32_T_LOCK_FREE
-# define ATOMIC_WCHAR_T_LOCK_FREE   __GCC_ATOMIC_WCHAR_T_LOCK_FREE
-# define ATOMIC_SHORT_LOCK_FREE     __GCC_ATOMIC_SHORT_LOCK_FREE
-# define ATOMIC_INT_LOCK_FREE       __GCC_ATOMIC_INT_LOCK_FREE
-# define ATOMIC_LONG_LOCK_FREE      __GCC_ATOMIC_LONG_LOCK_FREE
-# define ATOMIC_LLONG_LOCK_FREE     __GCC_ATOMIC_LLONG_LOCK_FREE
-# define ATOMIC_POINTER_LOCK_FREE   __GCC_ATOMIC_POINTER_LOCK_FREE
-#endif
-
-template <class _Tp>
-struct __libcpp_is_always_lock_free {
-  // __atomic_always_lock_free is available in all Standard modes
-  static const bool __value = __atomic_always_lock_free(sizeof(_Tp), 0);
-};
-
-#ifdef _LIBCPP_ATOMIC_ONLY_USE_BUILTINS
-
-template<typename _Tp>
-struct __cxx_atomic_lock_impl {
-
-  _LIBCPP_INLINE_VISIBILITY
-  __cxx_atomic_lock_impl() _NOEXCEPT
-    : __a_value(), __a_lock(0) {}
-  _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR explicit
-  __cxx_atomic_lock_impl(_Tp value) _NOEXCEPT
-    : __a_value(value), __a_lock(0) {}
-
-  _Tp __a_value;
-  mutable __cxx_atomic_base_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_lock;
-
-  _LIBCPP_INLINE_VISIBILITY void __lock() const volatile {
-    while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
-        /*spin*/;
-  }
-  _LIBCPP_INLINE_VISIBILITY void __lock() const {
-    while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
-        /*spin*/;
-  }
-  _LIBCPP_INLINE_VISIBILITY void __unlock() const volatile {
-    __cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
-  }
-  _LIBCPP_INLINE_VISIBILITY void __unlock() const {
-    __cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
-  }
-  _LIBCPP_INLINE_VISIBILITY _Tp __read() const volatile {
-    __lock();
-    _Tp __old;
-    __cxx_atomic_assign_volatile(__old, __a_value);
-    __unlock();
-    return __old;
-  }
-  _LIBCPP_INLINE_VISIBILITY _Tp __read() const {
-    __lock();
-    _Tp __old = __a_value;
-    __unlock();
-    return __old;
-  }
-};
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(volatile __cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val) {
-  __cxx_atomic_assign_volatile(__a->__a_value, __val);
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_init(__cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val) {
-  __a->__a_value = __val;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(volatile __cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val, memory_order) {
-  __a->__lock();
-  __cxx_atomic_assign_volatile(__a->__a_value, __val);
-  __a->__unlock();
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void __cxx_atomic_store(__cxx_atomic_lock_impl<_Tp>* __a,  _Tp __val, memory_order) {
-  __a->__lock();
-  __a->__a_value = __val;
-  __a->__unlock();
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(const volatile __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
-  return __a->__read();
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_load(const __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
-  return __a->__read();
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(volatile __cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, __value);
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_exchange(__cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value = __value;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                                          _Tp* __expected, _Tp __value, memory_order, memory_order) {
-  _Tp __temp;
-  __a->__lock();
-  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
-  bool __ret = (_VSTD::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
-  if(__ret)
-    __cxx_atomic_assign_volatile(__a->__a_value, __value);
-  else
-    __cxx_atomic_assign_volatile(*__expected, __a->__a_value);
-  __a->__unlock();
-  return __ret;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_lock_impl<_Tp>* __a,
-                                          _Tp* __expected, _Tp __value, memory_order, memory_order) {
-  __a->__lock();
-  bool __ret = (_VSTD::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
-  if(__ret)
-    _VSTD::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
-  else
-    _VSTD::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
-  __a->__unlock();
-  return __ret;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                                        _Tp* __expected, _Tp __value, memory_order, memory_order) {
-  _Tp __temp;
-  __a->__lock();
-  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
-  bool __ret = (_VSTD::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
-  if(__ret)
-    __cxx_atomic_assign_volatile(__a->__a_value, __value);
-  else
-    __cxx_atomic_assign_volatile(*__expected, __a->__a_value);
-  __a->__unlock();
-  return __ret;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_lock_impl<_Tp>* __a,
-                                        _Tp* __expected, _Tp __value, memory_order, memory_order) {
-  __a->__lock();
-  bool __ret = (_VSTD::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
-  if(__ret)
-    _VSTD::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
-  else
-    _VSTD::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
-  __a->__unlock();
-  return __ret;
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                           _Td __delta, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old + __delta));
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp>* __a,
-                           _Td __delta, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value += __delta;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp*>* __a,
-                           ptrdiff_t __delta, memory_order) {
-  __a->__lock();
-  _Tp* __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, __old + __delta);
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp* __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp*>* __a,
-                           ptrdiff_t __delta, memory_order) {
-  __a->__lock();
-  _Tp* __old = __a->__a_value;
-  __a->__a_value += __delta;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                           _Td __delta, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old - __delta));
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp, typename _Td>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_sub(__cxx_atomic_lock_impl<_Tp>* __a,
-                           _Td __delta, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value -= __delta;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old & __pattern));
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_and(__cxx_atomic_lock_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value &= __pattern;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                          _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old | __pattern));
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_or(__cxx_atomic_lock_impl<_Tp>* __a,
-                          _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value |= __pattern;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_lock_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old;
-  __cxx_atomic_assign_volatile(__old, __a->__a_value);
-  __cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old ^ __pattern));
-  __a->__unlock();
-  return __old;
-}
-template <typename _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp __cxx_atomic_fetch_xor(__cxx_atomic_lock_impl<_Tp>* __a,
-                           _Tp __pattern, memory_order) {
-  __a->__lock();
-  _Tp __old = __a->__a_value;
-  __a->__a_value ^= __pattern;
-  __a->__unlock();
-  return __old;
-}
-
-template <typename _Tp,
-          typename _Base = typename conditional<__libcpp_is_always_lock_free<_Tp>::__value,
-                                                __cxx_atomic_base_impl<_Tp>,
-                                                __cxx_atomic_lock_impl<_Tp> >::type>
-#else
-template <typename _Tp,
-          typename _Base = __cxx_atomic_base_impl<_Tp> >
-#endif //_LIBCPP_ATOMIC_ONLY_USE_BUILTINS
-struct __cxx_atomic_impl : public _Base {
-    static_assert(is_trivially_copyable<_Tp>::value,
-      "std::atomic<T> requires that 'T' be a trivially copyable type");
-
-  _LIBCPP_INLINE_VISIBILITY __cxx_atomic_impl() _NOEXCEPT = default;
-  _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR explicit __cxx_atomic_impl(_Tp __value) _NOEXCEPT
-    : _Base(__value) {}
-};
-
-#if defined(__linux__) || (defined(_AIX) && !defined(__64BIT__))
-    using __cxx_contention_t = int32_t;
-#else
-    using __cxx_contention_t = int64_t;
-#endif // __linux__ || (_AIX && !__64BIT__)
-
-using __cxx_atomic_contention_t = __cxx_atomic_impl<__cxx_contention_t>;
-
-#ifndef _LIBCPP_HAS_NO_THREADS
-
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(void const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(void const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(void const volatile*, __cxx_contention_t);
-
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile*);
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(__cxx_atomic_contention_t const volatile*, __cxx_contention_t);
-
-template <class _Atp, class _Fn>
-struct __libcpp_atomic_wait_backoff_impl {
-    _Atp* __a;
-    _Fn __test_fn;
-    _LIBCPP_AVAILABILITY_SYNC
-    _LIBCPP_INLINE_VISIBILITY bool operator()(chrono::nanoseconds __elapsed) const
-    {
-        if(__elapsed > chrono::microseconds(64))
-        {
-            auto const __monitor = std::__libcpp_atomic_monitor(__a);
-            if(__test_fn())
-                return true;
-            std::__libcpp_atomic_wait(__a, __monitor);
-        }
-        else if(__elapsed > chrono::microseconds(4))
-            __libcpp_thread_yield();
-        else
-            {} // poll
-        return false;
-    }
-};
-
-template <class _Atp, class _Fn>
-_LIBCPP_AVAILABILITY_SYNC
-_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp* __a, _Fn && __test_fn)
-{
-    __libcpp_atomic_wait_backoff_impl<_Atp, typename decay<_Fn>::type> __backoff_fn = {__a, __test_fn};
-    return std::__libcpp_thread_poll_with_backoff(__test_fn, __backoff_fn);
-}
-
-#else // _LIBCPP_HAS_NO_THREADS
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY void __cxx_atomic_notify_all(__cxx_atomic_impl<_Tp> const volatile*) { }
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY void __cxx_atomic_notify_one(__cxx_atomic_impl<_Tp> const volatile*) { }
-template <class _Atp, class _Fn>
-_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp*, _Fn && __test_fn)
-{
-    return __libcpp_thread_poll_with_backoff(__test_fn, __spinning_backoff_policy());
-}
-
-#endif // _LIBCPP_HAS_NO_THREADS
-
-template <class _Atp, class _Tp>
-struct __cxx_atomic_wait_test_fn_impl {
-    _Atp* __a;
-    _Tp __val;
-    memory_order __order;
-    _LIBCPP_INLINE_VISIBILITY bool operator()() const
-    {
-        return !std::__cxx_nonatomic_compare_equal(std::__cxx_atomic_load(__a, __order), __val);
-    }
-};
-
-template <class _Atp, class _Tp>
-_LIBCPP_AVAILABILITY_SYNC
-_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp* __a, _Tp const __val, memory_order __order)
-{
-    __cxx_atomic_wait_test_fn_impl<_Atp, _Tp> __test_fn = {__a, __val, __order};
-    return std::__cxx_atomic_wait(__a, __test_fn);
-}
-
-// general atomic<T>
-
-template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
-struct __atomic_base  // false
-{
-    mutable __cxx_atomic_impl<_Tp> __a_;
-
-#if defined(__cpp_lib_atomic_is_always_lock_free)
-  static _LIBCPP_CONSTEXPR bool is_always_lock_free = __libcpp_is_always_lock_free<__cxx_atomic_impl<_Tp> >::__value;
-#endif
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool is_lock_free() const volatile _NOEXCEPT
-        {return __cxx_atomic_is_lock_free(sizeof(_Tp));}
-    _LIBCPP_INLINE_VISIBILITY
-    bool is_lock_free() const _NOEXCEPT
-        {return static_cast<__atomic_base const volatile*>(this)->is_lock_free();}
-    _LIBCPP_INLINE_VISIBILITY
-    void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-      _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
-        {std::__cxx_atomic_store(&__a_, __d, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    void store(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-      _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
-        {std::__cxx_atomic_store(&__a_, __d, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp load(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
-      _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-        {return std::__cxx_atomic_load(&__a_, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp load(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
-      _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-        {return std::__cxx_atomic_load(&__a_, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    operator _Tp() const volatile _NOEXCEPT {return load();}
-    _LIBCPP_INLINE_VISIBILITY
-    operator _Tp() const _NOEXCEPT          {return load();}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_exchange(&__a_, __d, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_exchange(&__a_, __d, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_weak(_Tp& __e, _Tp __d,
-                               memory_order __s, memory_order __f) volatile _NOEXCEPT
-      _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-        {return std::__cxx_atomic_compare_exchange_weak(&__a_, &__e, __d, __s, __f);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_weak(_Tp& __e, _Tp __d,
-                               memory_order __s, memory_order __f) _NOEXCEPT
-      _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-        {return std::__cxx_atomic_compare_exchange_weak(&__a_, &__e, __d, __s, __f);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_strong(_Tp& __e, _Tp __d,
-                                 memory_order __s, memory_order __f) volatile _NOEXCEPT
-      _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-        {return std::__cxx_atomic_compare_exchange_strong(&__a_, &__e, __d, __s, __f);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_strong(_Tp& __e, _Tp __d,
-                                 memory_order __s, memory_order __f) _NOEXCEPT
-      _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-        {return std::__cxx_atomic_compare_exchange_strong(&__a_, &__e, __d, __s, __f);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_weak(_Tp& __e, _Tp __d,
-                              memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_compare_exchange_weak(&__a_, &__e, __d, __m, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_weak(_Tp& __e, _Tp __d,
-                               memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_compare_exchange_weak(&__a_, &__e, __d, __m, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_strong(_Tp& __e, _Tp __d,
-                              memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_compare_exchange_strong(&__a_, &__e, __d, __m, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool compare_exchange_strong(_Tp& __e, _Tp __d,
-                                 memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_compare_exchange_strong(&__a_, &__e, __d, __m, __m);}
-
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
-        {std::__cxx_atomic_wait(&__a_, __v, __m);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT
-        {std::__cxx_atomic_wait(&__a_, __v, __m);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_one() volatile _NOEXCEPT
-        {std::__cxx_atomic_notify_one(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_one() _NOEXCEPT
-        {std::__cxx_atomic_notify_one(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_all() volatile _NOEXCEPT
-        {std::__cxx_atomic_notify_all(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_all() _NOEXCEPT
-        {std::__cxx_atomic_notify_all(&__a_);}
-
-#if _LIBCPP_STD_VER > 17
-    _LIBCPP_INLINE_VISIBILITY constexpr
-    __atomic_base() noexcept(is_nothrow_default_constructible_v<_Tp>) : __a_(_Tp()) {}
-#else
-    _LIBCPP_INLINE_VISIBILITY
-    __atomic_base() _NOEXCEPT = default;
-#endif
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    __atomic_base(_Tp __d) _NOEXCEPT : __a_(__d) {}
-
-    __atomic_base(const __atomic_base&) = delete;
-};
-
-#if defined(__cpp_lib_atomic_is_always_lock_free)
-template <class _Tp, bool __b>
-_LIBCPP_CONSTEXPR bool __atomic_base<_Tp, __b>::is_always_lock_free;
-#endif
-
-// atomic<Integral>
-
-template <class _Tp>
-struct __atomic_base<_Tp, true>
-    : public __atomic_base<_Tp, false>
-{
-    typedef __atomic_base<_Tp, false> __base;
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __atomic_base() _NOEXCEPT = default;
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __base(__d) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_fetch_add(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_fetch_add(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_fetch_and(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_fetch_and(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_fetch_or(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_fetch_or(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return std::__cxx_atomic_fetch_xor(&this->__a_, __op, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return std::__cxx_atomic_fetch_xor(&this->__a_, __op, __m);}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator++(int) volatile _NOEXCEPT      {return fetch_add(_Tp(1));}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator++(int) _NOEXCEPT               {return fetch_add(_Tp(1));}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator--(int) volatile _NOEXCEPT      {return fetch_sub(_Tp(1));}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator--(int) _NOEXCEPT               {return fetch_sub(_Tp(1));}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator++() volatile _NOEXCEPT         {return fetch_add(_Tp(1)) + _Tp(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator++() _NOEXCEPT                  {return fetch_add(_Tp(1)) + _Tp(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator--() volatile _NOEXCEPT         {return fetch_sub(_Tp(1)) - _Tp(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator--() _NOEXCEPT                  {return fetch_sub(_Tp(1)) - _Tp(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator+=(_Tp __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator+=(_Tp __op) _NOEXCEPT          {return fetch_add(__op) + __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator-=(_Tp __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator-=(_Tp __op) _NOEXCEPT          {return fetch_sub(__op) - __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator&=(_Tp __op) volatile _NOEXCEPT {return fetch_and(__op) & __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator&=(_Tp __op) _NOEXCEPT          {return fetch_and(__op) & __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator|=(_Tp __op) volatile _NOEXCEPT {return fetch_or(__op) | __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator|=(_Tp __op) _NOEXCEPT          {return fetch_or(__op) | __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator^=(_Tp __op) volatile _NOEXCEPT {return fetch_xor(__op) ^ __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator^=(_Tp __op) _NOEXCEPT          {return fetch_xor(__op) ^ __op;}
-};
-
-// atomic<T>
-
-template <class _Tp>
-struct atomic
-    : public __atomic_base<_Tp>
-{
-    typedef __atomic_base<_Tp> __base;
-    typedef _Tp value_type;
-    typedef value_type difference_type;
-
-#if _LIBCPP_STD_VER > 17
-    _LIBCPP_INLINE_VISIBILITY
-    atomic() = default;
-#else
-    _LIBCPP_INLINE_VISIBILITY
-    atomic() _NOEXCEPT = default;
-#endif
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR atomic(_Tp __d) _NOEXCEPT : __base(__d) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator=(_Tp __d) volatile _NOEXCEPT
-        {__base::store(__d); return __d;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp operator=(_Tp __d) _NOEXCEPT
-        {__base::store(__d); return __d;}
-
-    atomic& operator=(const atomic&) = delete;
-    atomic& operator=(const atomic&) volatile = delete;
-};
-
-// atomic<T*>
-
-template <class _Tp>
-struct atomic<_Tp*>
-    : public __atomic_base<_Tp*>
-{
-    typedef __atomic_base<_Tp*> __base;
-    typedef _Tp* value_type;
-    typedef ptrdiff_t difference_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    atomic() _NOEXCEPT = default;
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR atomic(_Tp* __d) _NOEXCEPT : __base(__d) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator=(_Tp* __d) volatile _NOEXCEPT
-        {__base::store(__d); return __d;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator=(_Tp* __d) _NOEXCEPT
-        {__base::store(__d); return __d;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
-        // __atomic_fetch_add accepts function pointers, guard against them.
-        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
-        return std::__cxx_atomic_fetch_add(&this->__a_, __op, __m);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
-        // __atomic_fetch_add accepts function pointers, guard against them.
-        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
-        return std::__cxx_atomic_fetch_add(&this->__a_, __op, __m);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
-        // __atomic_fetch_add accepts function pointers, guard against them.
-        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
-        return std::__cxx_atomic_fetch_sub(&this->__a_, __op, __m);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
-        // __atomic_fetch_add accepts function pointers, guard against them.
-        static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
-        return std::__cxx_atomic_fetch_sub(&this->__a_, __op, __m);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator++(int) volatile _NOEXCEPT            {return fetch_add(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator++(int) _NOEXCEPT                     {return fetch_add(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator--(int) volatile _NOEXCEPT            {return fetch_sub(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator--(int) _NOEXCEPT                     {return fetch_sub(1);}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator++() volatile _NOEXCEPT               {return fetch_add(1) + 1;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator++() _NOEXCEPT                        {return fetch_add(1) + 1;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator--() volatile _NOEXCEPT               {return fetch_sub(1) - 1;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator--() _NOEXCEPT                        {return fetch_sub(1) - 1;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator+=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator+=(ptrdiff_t __op) _NOEXCEPT          {return fetch_add(__op) + __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator-=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
-    _LIBCPP_INLINE_VISIBILITY
-    _Tp* operator-=(ptrdiff_t __op) _NOEXCEPT          {return fetch_sub(__op) - __op;}
-
-    atomic& operator=(const atomic&) = delete;
-    atomic& operator=(const atomic&) volatile = delete;
-};
-
-// atomic_is_lock_free
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_is_lock_free(const volatile atomic<_Tp>* __o) _NOEXCEPT
-{
-    return __o->is_lock_free();
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_is_lock_free(const atomic<_Tp>* __o) _NOEXCEPT
-{
-    return __o->is_lock_free();
-}
-
-// atomic_init
-
-template <class _Tp>
-_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_INLINE_VISIBILITY
-void
-atomic_init(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    std::__cxx_atomic_init(&__o->__a_, __d);
-}
-
-template <class _Tp>
-_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_INLINE_VISIBILITY
-void
-atomic_init(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    std::__cxx_atomic_init(&__o->__a_, __d);
-}
-
-// atomic_store
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void
-atomic_store(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    __o->store(__d);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void
-atomic_store(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    __o->store(__d);
-}
-
-// atomic_store_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void
-atomic_store_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
-{
-    __o->store(__d, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-void
-atomic_store_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m)
-{
-    __o->store(__d, __m);
-}
-
-// atomic_load
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_load(const volatile atomic<_Tp>* __o) _NOEXCEPT
-{
-    return __o->load();
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_load(const atomic<_Tp>* __o) _NOEXCEPT
-{
-    return __o->load();
-}
-
-// atomic_load_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_load_explicit(const volatile atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-{
-    return __o->load(__m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_load_explicit(const atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-{
-    return __o->load(__m);
-}
-
-// atomic_exchange
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_exchange(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->exchange(__d);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_exchange(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->exchange(__d);
-}
-
-// atomic_exchange_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_exchange_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
-{
-    return __o->exchange(__d, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_exchange_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
-{
-    return __o->exchange(__d, __m);
-}
-
-// atomic_compare_exchange_weak
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_weak(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->compare_exchange_weak(*__e, __d);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_weak(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->compare_exchange_weak(*__e, __d);
-}
-
-// atomic_compare_exchange_strong
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_strong(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->compare_exchange_strong(*__e, __d);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_strong(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT
-{
-    return __o->compare_exchange_strong(*__e, __d);
-}
-
-// atomic_compare_exchange_weak_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_weak_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e,
-                                      typename atomic<_Tp>::value_type __d,
-                                      memory_order __s, memory_order __f) _NOEXCEPT
-  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-{
-    return __o->compare_exchange_weak(*__e, __d, __s, __f);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_weak_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d,
-                                      memory_order __s, memory_order __f) _NOEXCEPT
-  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-{
-    return __o->compare_exchange_weak(*__e, __d, __s, __f);
-}
-
-// atomic_compare_exchange_strong_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_strong_explicit(volatile atomic<_Tp>* __o,
-                                        typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d,
-                                        memory_order __s, memory_order __f) _NOEXCEPT
-  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-{
-    return __o->compare_exchange_strong(*__e, __d, __s, __f);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-bool
-atomic_compare_exchange_strong_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e,
-                                        typename atomic<_Tp>::value_type __d,
-                                        memory_order __s, memory_order __f) _NOEXCEPT
-  _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f)
-{
-    return __o->compare_exchange_strong(*__e, __d, __s, __f);
-}
-
-// atomic_wait
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_wait(const volatile atomic<_Tp>* __o,
-                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
-{
-    return __o->wait(__v);
-}
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_wait(const atomic<_Tp>* __o,
-                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
-{
-    return __o->wait(__v);
-}
-
-// atomic_wait_explicit
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_wait_explicit(const volatile atomic<_Tp>* __o,
-                          typename atomic<_Tp>::value_type __v,
-                          memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-{
-    return __o->wait(__v, __m);
-}
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_wait_explicit(const atomic<_Tp>* __o,
-                          typename atomic<_Tp>::value_type __v,
-                          memory_order __m) _NOEXCEPT
-  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
-{
-    return __o->wait(__v, __m);
-}
-
-// atomic_notify_one
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_notify_one(volatile atomic<_Tp>* __o) _NOEXCEPT
-{
-    __o->notify_one();
-}
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_notify_one(atomic<_Tp>* __o) _NOEXCEPT
-{
-    __o->notify_one();
-}
-
-// atomic_notify_all
-
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_notify_all(volatile atomic<_Tp>* __o) _NOEXCEPT
-{
-    __o->notify_all();
-}
-template <class _Tp>
-_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-void atomic_notify_all(atomic<_Tp>* __o) _NOEXCEPT
-{
-    __o->notify_all();
-}
-
-// atomic_fetch_add
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_fetch_add(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
-{
-    return __o->fetch_add(__op);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp
-atomic_fetch_add(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
-{
-    return __o->fetch_add(__op);
-}
-
-// atomic_fetch_add_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_add_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_add(__op, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_add_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_add(__op, __m);
-}
-
-// atomic_fetch_sub
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_sub(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
-{
-    return __o->fetch_sub(__op);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_sub(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT
-{
-    return __o->fetch_sub(__op);
-}
-
-// atomic_fetch_sub_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_sub_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_sub(__op, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-_Tp atomic_fetch_sub_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_sub(__op, __m);
-}
-
-// atomic_fetch_and
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_and(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_and(__op);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_and(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_and(__op);
-}
-
-// atomic_fetch_and_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_and_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_and(__op, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_and_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_and(__op, __m);
-}
-
-// atomic_fetch_or
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_or(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_or(__op);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_or(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_or(__op);
-}
-
-// atomic_fetch_or_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_or_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_or(__op, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_or_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_or(__op, __m);
-}
-
-// atomic_fetch_xor
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_xor(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_xor(__op);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_xor(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT
-{
-    return __o->fetch_xor(__op);
-}
-
-// atomic_fetch_xor_explicit
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_xor_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_xor(__op, __m);
-}
-
-template <class _Tp>
-_LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
-    _Tp
->::type
-atomic_fetch_xor_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT
-{
-    return __o->fetch_xor(__op, __m);
-}
-
-// flag type and operations
-
-typedef struct atomic_flag
-{
-    __cxx_atomic_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_;
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool test(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
-        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool test(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
-        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool test_and_set(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {return __cxx_atomic_exchange(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(true), __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    bool test_and_set(memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {return __cxx_atomic_exchange(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(true), __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    void clear(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
-        {__cxx_atomic_store(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(false), __m);}
-    _LIBCPP_INLINE_VISIBILITY
-    void clear(memory_order __m = memory_order_seq_cst) _NOEXCEPT
-        {__cxx_atomic_store(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(false), __m);}
-
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void wait(bool __v, memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
-        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void wait(bool __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT
-        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void notify_one() volatile _NOEXCEPT
-        {__cxx_atomic_notify_one(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void notify_one() _NOEXCEPT
-        {__cxx_atomic_notify_one(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void notify_all() volatile _NOEXCEPT
-        {__cxx_atomic_notify_all(&__a_);}
-    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
-    void notify_all() _NOEXCEPT
-        {__cxx_atomic_notify_all(&__a_);}
-
-#if _LIBCPP_STD_VER > 17
-    _LIBCPP_INLINE_VISIBILITY constexpr
-    atomic_flag() _NOEXCEPT : __a_(false) {}
-#else
-    _LIBCPP_INLINE_VISIBILITY
-    atomic_flag() _NOEXCEPT = default;
-#endif
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    atomic_flag(bool __b) _NOEXCEPT : __a_(__b) {} // EXTENSION
-
-    atomic_flag(const atomic_flag&) = delete;
-    atomic_flag& operator=(const atomic_flag&) = delete;
-    atomic_flag& operator=(const atomic_flag&) volatile = delete;
-
-} atomic_flag;
-
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test(const volatile atomic_flag* __o) _NOEXCEPT
-{
-    return __o->test();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test(const atomic_flag* __o) _NOEXCEPT
-{
-    return __o->test();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_explicit(const volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    return __o->test(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_explicit(const atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    return __o->test(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_and_set(volatile atomic_flag* __o) _NOEXCEPT
-{
-    return __o->test_and_set();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_and_set(atomic_flag* __o) _NOEXCEPT
-{
-    return __o->test_and_set();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_and_set_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    return __o->test_and_set(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-atomic_flag_test_and_set_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    return __o->test_and_set(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_flag_clear(volatile atomic_flag* __o) _NOEXCEPT
-{
-    __o->clear();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_flag_clear(atomic_flag* __o) _NOEXCEPT
-{
-    __o->clear();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_flag_clear_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    __o->clear(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_flag_clear_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
-{
-    __o->clear(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_wait(const volatile atomic_flag* __o, bool __v) _NOEXCEPT
-{
-    __o->wait(__v);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_wait(const atomic_flag* __o, bool __v) _NOEXCEPT
-{
-    __o->wait(__v);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_wait_explicit(const volatile atomic_flag* __o,
-                          bool __v, memory_order __m) _NOEXCEPT
-{
-    __o->wait(__v, __m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_wait_explicit(const atomic_flag* __o,
-                          bool __v, memory_order __m) _NOEXCEPT
-{
-    __o->wait(__v, __m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_notify_one(volatile atomic_flag* __o) _NOEXCEPT
-{
-    __o->notify_one();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_notify_one(atomic_flag* __o) _NOEXCEPT
-{
-    __o->notify_one();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_notify_all(volatile atomic_flag* __o) _NOEXCEPT
-{
-    __o->notify_all();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
-void
-atomic_flag_notify_all(atomic_flag* __o) _NOEXCEPT
-{
-    __o->notify_all();
-}
-
-// fences
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_thread_fence(memory_order __m) _NOEXCEPT
-{
-    __cxx_atomic_thread_fence(__m);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void
-atomic_signal_fence(memory_order __m) _NOEXCEPT
-{
-    __cxx_atomic_signal_fence(__m);
-}
-
-// Atomics for standard typedef types
-
-typedef atomic<bool>               atomic_bool;
-typedef atomic<char>               atomic_char;
-typedef atomic<signed char>        atomic_schar;
-typedef atomic<unsigned char>      atomic_uchar;
-typedef atomic<short>              atomic_short;
-typedef atomic<unsigned short>     atomic_ushort;
-typedef atomic<int>                atomic_int;
-typedef atomic<unsigned int>       atomic_uint;
-typedef atomic<long>               atomic_long;
-typedef atomic<unsigned long>      atomic_ulong;
-typedef atomic<long long>          atomic_llong;
-typedef atomic<unsigned long long> atomic_ullong;
-#ifndef _LIBCPP_HAS_NO_CHAR8_T
-typedef atomic<char8_t>            atomic_char8_t;
-#endif
-typedef atomic<char16_t>           atomic_char16_t;
-typedef atomic<char32_t>           atomic_char32_t;
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-typedef atomic<wchar_t>            atomic_wchar_t;
-#endif
-
-typedef atomic<int_least8_t>   atomic_int_least8_t;
-typedef atomic<uint_least8_t>  atomic_uint_least8_t;
-typedef atomic<int_least16_t>  atomic_int_least16_t;
-typedef atomic<uint_least16_t> atomic_uint_least16_t;
-typedef atomic<int_least32_t>  atomic_int_least32_t;
-typedef atomic<uint_least32_t> atomic_uint_least32_t;
-typedef atomic<int_least64_t>  atomic_int_least64_t;
-typedef atomic<uint_least64_t> atomic_uint_least64_t;
-
-typedef atomic<int_fast8_t>   atomic_int_fast8_t;
-typedef atomic<uint_fast8_t>  atomic_uint_fast8_t;
-typedef atomic<int_fast16_t>  atomic_int_fast16_t;
-typedef atomic<uint_fast16_t> atomic_uint_fast16_t;
-typedef atomic<int_fast32_t>  atomic_int_fast32_t;
-typedef atomic<uint_fast32_t> atomic_uint_fast32_t;
-typedef atomic<int_fast64_t>  atomic_int_fast64_t;
-typedef atomic<uint_fast64_t> atomic_uint_fast64_t;
-
-typedef atomic< int8_t>  atomic_int8_t;
-typedef atomic<uint8_t>  atomic_uint8_t;
-typedef atomic< int16_t> atomic_int16_t;
-typedef atomic<uint16_t> atomic_uint16_t;
-typedef atomic< int32_t> atomic_int32_t;
-typedef atomic<uint32_t> atomic_uint32_t;
-typedef atomic< int64_t> atomic_int64_t;
-typedef atomic<uint64_t> atomic_uint64_t;
-
-typedef atomic<intptr_t>  atomic_intptr_t;
-typedef atomic<uintptr_t> atomic_uintptr_t;
-typedef atomic<size_t>    atomic_size_t;
-typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
-typedef atomic<intmax_t>  atomic_intmax_t;
-typedef atomic<uintmax_t> atomic_uintmax_t;
-
-// atomic_*_lock_free : prefer the contention type most highly, then the largest lock-free type
-
-#ifdef __cpp_lib_atomic_is_always_lock_free
-# define _LIBCPP_CONTENTION_LOCK_FREE ::std::__libcpp_is_always_lock_free<__cxx_contention_t>::__value
-#else
-# define _LIBCPP_CONTENTION_LOCK_FREE false
-#endif
-
-#if ATOMIC_LLONG_LOCK_FREE == 2
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, long long>          __libcpp_signed_lock_free;
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned long long> __libcpp_unsigned_lock_free;
-#elif ATOMIC_INT_LOCK_FREE == 2
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, int>                __libcpp_signed_lock_free;
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned int>       __libcpp_unsigned_lock_free;
-#elif ATOMIC_SHORT_LOCK_FREE == 2
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, short>              __libcpp_signed_lock_free;
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned short>     __libcpp_unsigned_lock_free;
-#elif ATOMIC_CHAR_LOCK_FREE == 2
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, char>               __libcpp_signed_lock_free;
-typedef __conditional_t<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned char>      __libcpp_unsigned_lock_free;
-#else
-    // No signed/unsigned lock-free types
-#define _LIBCPP_NO_LOCK_FREE_TYPES
-#endif
-
-#if !defined(_LIBCPP_NO_LOCK_FREE_TYPES)
-typedef atomic<__libcpp_signed_lock_free> atomic_signed_lock_free;
-typedef atomic<__libcpp_unsigned_lock_free> atomic_unsigned_lock_free;
-#endif
-
-#define ATOMIC_FLAG_INIT {false}
-#define ATOMIC_VAR_INIT(__v) {__v}
-
-#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
-# if defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1400
-#  pragma clang deprecated(ATOMIC_VAR_INIT)
-# endif
-#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
-
-_LIBCPP_END_NAMESPACE_STD
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <cmath>
 #  include <compare>
+#  include <cstring>
 #  include <type_traits>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/barrier b/third_party/llvm-project/libcxx/include/barrier
index 2e8906b..ebaff8b 100644
--- a/third_party/llvm-project/libcxx/include/barrier
+++ b/third_party/llvm-project/libcxx/include/barrier
@@ -46,13 +46,18 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__atomic/atomic_base.h>
+#include <__atomic/memory_order.h>
 #include <__availability>
 #include <__config>
 #include <__memory/unique_ptr.h>
+#include <__thread/poll_with_backoff.h>
 #include <__thread/timed_backoff_policy.h>
 #include <__utility/move.h>
-#include <atomic>
+#include <cstddef>
+#include <cstdint>
 #include <limits>
+#include <version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -130,7 +135,7 @@
               __expected_adjustment_(0), __completion_(std::move(__completion)), __phase_(0)
     {
     }
-    [[nodiscard]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    [[__nodiscard__]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
     arrival_token arrive(ptrdiff_t __update)
     {
         auto const __old_phase = __phase_.load(memory_order_relaxed);
@@ -300,7 +305,7 @@
     barrier(barrier const&) = delete;
     barrier& operator=(barrier const&) = delete;
 
-    [[nodiscard]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    [[__nodiscard__]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
     arrival_token arrive(ptrdiff_t __update = 1)
     {
         return __b_.arrive(__update);
@@ -329,6 +334,7 @@
 _LIBCPP_POP_MACROS
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
 #  include <iterator>
 #  include <memory>
diff --git a/third_party/llvm-project/libcxx/include/bit b/third_party/llvm-project/libcxx/include/bit
index d17a6e4..6b35bb2 100644
--- a/third_party/llvm-project/libcxx/include/bit
+++ b/third_party/llvm-project/libcxx/include/bit
@@ -83,6 +83,7 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
 #  include <iosfwd>
 #  include <limits>
 #  include <type_traits>
diff --git a/third_party/llvm-project/libcxx/include/bitset b/third_party/llvm-project/libcxx/include/bitset
index c260f9f..fc8ffb8 100644
--- a/third_party/llvm-project/libcxx/include/bitset
+++ b/third_party/llvm-project/libcxx/include/bitset
@@ -795,11 +795,11 @@
         if (__str[__i] != __zero && __str[__i] != __one)
             __throw_invalid_argument("bitset string ctor has invalid argument");
 
-    size_t _Mp = _VSTD::min(__rlen, _Size);
+    size_t __mp = _VSTD::min(__rlen, _Size);
     size_t __i = 0;
-    for (; __i < _Mp; ++__i)
+    for (; __i < __mp; ++__i)
     {
-        _CharT __c = __str[_Mp - 1 - __i];
+        _CharT __c = __str[__mp - 1 - __i];
         (*this)[__i] = (__c == __one);
     }
     _VSTD::fill(base::__make_iter(__i), base::__make_iter(_Size), false);
@@ -821,11 +821,11 @@
         if (!_Traits::eq(__str[__i], __zero) && !_Traits::eq(__str[__i], __one))
             __throw_invalid_argument("bitset string ctor has invalid argument");
 
-    size_t _Mp = _VSTD::min(__rlen, _Size);
+    size_t __mp = _VSTD::min(__rlen, _Size);
     size_t __i = 0;
-    for (; __i < _Mp; ++__i)
+    for (; __i < __mp; ++__i)
     {
-        _CharT __c = __str[__pos + _Mp - 1 - __i];
+        _CharT __c = __str[__pos + __mp - 1 - __i];
         (*this)[__i] = _Traits::eq(__c, __one);
     }
     _VSTD::fill(base::__make_iter(__i), base::__make_iter(_Size), false);
@@ -956,8 +956,8 @@
     if (__pos >= _Size)
         __throw_out_of_range("bitset flip argument out of range");
 
-    reference r = base::__make_ref(__pos);
-    r = ~r;
+    reference __r = base::__make_ref(__pos);
+    __r = ~__r;
     return *this;
 }
 
@@ -1154,6 +1154,8 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_BITSET
diff --git a/third_party/llvm-project/libcxx/include/charconv b/third_party/llvm-project/libcxx/include/charconv
index 9c74ce3..3b14237 100644
--- a/third_party/llvm-project/libcxx/include/charconv
+++ b/third_party/llvm-project/libcxx/include/charconv
@@ -63,785 +63,42 @@
   constexpr from_chars_result from_chars(const char* first, const char* last,
                                see below& value, int base = 10);                         // constexpr since C++23
 
-  from_chars_result from_chars(const char* first, const char* last,
-                               float& value,
-                               chars_format fmt = chars_format::general);
-  from_chars_result from_chars(const char* first, const char* last,
-                               double& value,
-                               chars_format fmt = chars_format::general);
-  from_chars_result from_chars(const char* first, const char* last,
-                               long double& value,
-                               chars_format fmt = chars_format::general);
-
 } // namespace std
 
 */
 
-#include <__algorithm/copy_n.h>
 #include <__assert> // all public C++ headers provide the assertion handler
-#include <__availability>
-#include <__bit/countl.h>
 #include <__charconv/chars_format.h>
+#include <__charconv/from_chars_integral.h>
 #include <__charconv/from_chars_result.h>
 #include <__charconv/tables.h>
+#include <__charconv/to_chars.h>
 #include <__charconv/to_chars_base_10.h>
+#include <__charconv/to_chars_floating_point.h>
+#include <__charconv/to_chars_integral.h>
 #include <__charconv/to_chars_result.h>
+#include <__charconv/traits.h>
 #include <__config>
 #include <__debug>
-#include <__errc>
-#include <__memory/addressof.h>
-#include <__type_traits/make_32_64_or_128_bit.h>
-#include <__utility/unreachable.h>
+#include <__system_error/errc.h>
 #include <cmath> // for log2f
 #include <cstdint>
-#include <cstdlib>
-#include <cstring>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-_LIBCPP_PUSH_MACROS
-#include <__undef_macros>
-
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
-
-to_chars_result to_chars(char*, char*, bool, int = 10) = delete;
-from_chars_result from_chars(const char*, const char*, bool, int = 10) = delete;
-
-namespace __itoa
-{
-
-template <typename _Tp, typename = void>
-struct _LIBCPP_HIDDEN __traits_base;
-
-template <typename _Tp>
-struct _LIBCPP_HIDDEN __traits_base<_Tp, __enable_if_t<sizeof(_Tp) <= sizeof(uint32_t)>>
-{
-    using type = uint32_t;
-
-    /// The width estimation using a log10 algorithm.
-    ///
-    /// The algorithm is based on
-    /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
-    /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
-    /// function requires its input to have at least one bit set the value of
-    /// zero is set to one. This means the first element of the lookup table is
-    /// zero.
-    static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v)
-    {
-        auto __t = (32 - std::__libcpp_clz(static_cast<type>(__v | 1))) * 1233 >> 12;
-        return __t - (__v < __itoa::__pow10_32[__t]) + 1;
-    }
-
-    static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v)
-    {
-        return __itoa::__base_10_u32(__p, __v);
-    }
-
-    static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_32)& __pow() { return __itoa::__pow10_32; }
-};
-
-template <typename _Tp>
-struct _LIBCPP_HIDDEN
-    __traits_base<_Tp, __enable_if_t<sizeof(_Tp) == sizeof(uint64_t)>> {
-  using type = uint64_t;
-
-  /// The width estimation using a log10 algorithm.
-  ///
-  /// The algorithm is based on
-  /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
-  /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
-  /// function requires its input to have at least one bit set the value of
-  /// zero is set to one. This means the first element of the lookup table is
-  /// zero.
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v) {
-    auto __t = (64 - std::__libcpp_clz(static_cast<type>(__v | 1))) * 1233 >> 12;
-    return __t - (__v < __itoa::__pow10_64[__t]) + 1;
-  }
-
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v) { return __itoa::__base_10_u64(__p, __v); }
-
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_64)& __pow() { return __itoa::__pow10_64; }
-};
-
-
-#  ifndef _LIBCPP_HAS_NO_INT128
-template <typename _Tp>
-struct _LIBCPP_HIDDEN
-    __traits_base<_Tp, __enable_if_t<sizeof(_Tp) == sizeof(__uint128_t)> > {
-  using type = __uint128_t;
-
-  /// The width estimation using a log10 algorithm.
-  ///
-  /// The algorithm is based on
-  /// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
-  /// Instead of using IntegerLogBase2 it uses __libcpp_clz. Since that
-  /// function requires its input to have at least one bit set the value of
-  /// zero is set to one. This means the first element of the lookup table is
-  /// zero.
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int __width(_Tp __v) {
-    _LIBCPP_ASSERT(__v > numeric_limits<uint64_t>::max(), "The optimizations for this algorithm fail when this isn't true.");
-    // There's always a bit set in the upper 64-bits.
-    auto __t = (128 - std::__libcpp_clz(static_cast<uint64_t>(__v >> 64))) * 1233 >> 12;
-    _LIBCPP_ASSERT(__t >= __itoa::__pow10_128_offset, "Index out of bounds");
-    // __t is adjusted since the lookup table misses the lower entries.
-    return __t - (__v < __itoa::__pow10_128[__t - __itoa::__pow10_128_offset]) + 1;
-  }
-
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char* __convert(char* __p, _Tp __v) { return __itoa::__base_10_u128(__p, __v); }
-
-  // TODO FMT This pow function should get an index.
-  // By moving this to its own header it can be reused by the pow function in to_chars_base_10.
-  static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI decltype(__pow10_128)& __pow() { return __itoa::__pow10_128; }
-};
-#endif
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
-__mul_overflowed(unsigned char __a, _Tp __b, unsigned char& __r)
-{
-    auto __c = __a * __b;
-    __r = __c;
-    return __c > numeric_limits<unsigned char>::max();
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
-__mul_overflowed(unsigned short __a, _Tp __b, unsigned short& __r)
-{
-    auto __c = __a * __b;
-    __r = __c;
-    return __c > numeric_limits<unsigned short>::max();
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
-__mul_overflowed(_Tp __a, _Tp __b, _Tp& __r)
-{
-    static_assert(is_unsigned<_Tp>::value, "");
-    return __builtin_mul_overflow(__a, __b, &__r);
-}
-
-template <typename _Tp, typename _Up>
-inline _LIBCPP_HIDE_FROM_ABI bool
-_LIBCPP_CONSTEXPR_SINCE_CXX23 __mul_overflowed(_Tp __a, _Up __b, _Tp& __r)
-{
-    return __itoa::__mul_overflowed(__a, static_cast<_Tp>(__b), __r);
-}
-
-template <typename _Tp>
-struct _LIBCPP_HIDDEN __traits : __traits_base<_Tp>
-{
-    static constexpr int digits = numeric_limits<_Tp>::digits10 + 1;
-    using __traits_base<_Tp>::__pow;
-    using typename __traits_base<_Tp>::type;
-
-    // precondition: at least one non-zero character available
-    static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI char const*
-    __read(char const* __p, char const* __ep, type& __a, type& __b)
-    {
-        type __cprod[digits];
-        int __j = digits - 1;
-        int __i = digits;
-        do
-        {
-            if (*__p < '0' || *__p > '9')
-                break;
-            __cprod[--__i] = *__p++ - '0';
-        } while (__p != __ep && __i != 0);
-
-        __a = __inner_product(__cprod + __i + 1, __cprod + __j, __pow() + 1,
-                              __cprod[__i]);
-        if (__itoa::__mul_overflowed(__cprod[__j], __pow()[__j - __i], __b))
-            --__p;
-        return __p;
-    }
-
-    template <typename _It1, typename _It2, class _Up>
-    static _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI _Up
-    __inner_product(_It1 __first1, _It1 __last1, _It2 __first2, _Up __init)
-    {
-        for (; __first1 < __last1; ++__first1, ++__first2)
-            __init = __init + *__first1 * *__first2;
-        return __init;
-    }
-};
-
-}  // namespace __itoa
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI _Tp
-__complement(_Tp __x)
-{
-    static_assert(is_unsigned<_Tp>::value, "cast to unsigned first");
-    return _Tp(~__x + 1);
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_itoa(char* __first, char* __last, _Tp __value, false_type);
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_itoa(char* __first, char* __last, _Tp __value, true_type)
-{
-    auto __x = std::__to_unsigned_like(__value);
-    if (__value < 0 && __first != __last)
-    {
-        *__first++ = '-';
-        __x = std::__complement(__x);
-    }
-
-    return std::__to_chars_itoa(__first, __last, __x, false_type());
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_itoa(char* __first, char* __last, _Tp __value, false_type)
-{
-    using __tx = __itoa::__traits<_Tp>;
-    auto __diff = __last - __first;
-
-    if (__tx::digits <= __diff || __tx::__width(__value) <= __diff)
-        return {__tx::__convert(__first, __value), errc(0)};
-    else
-        return {__last, errc::value_too_large};
-}
-
-#  ifndef _LIBCPP_HAS_NO_INT128
-template <>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_itoa(char* __first, char* __last, __uint128_t __value, false_type)
-{
-    // When the value fits in 64-bits use the 64-bit code path. This reduces
-    // the number of expensive calculations on 128-bit values.
-    //
-    // NOTE the 128-bit code path requires this optimization.
-    if(__value <= numeric_limits<uint64_t>::max())
-        return __to_chars_itoa(__first, __last, static_cast<uint64_t>(__value), false_type());
-
-    using __tx = __itoa::__traits<__uint128_t>;
-    auto __diff = __last - __first;
-
-    if (__tx::digits <= __diff || __tx::__width(__value) <= __diff)
-        return {__tx::__convert(__first, __value), errc(0)};
-    else
-        return {__last, errc::value_too_large};
-}
-#endif
-
-template <class _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_integral(char* __first, char* __last, _Tp __value, int __base, false_type);
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
-                    true_type)
-{
-    auto __x = std::__to_unsigned_like(__value);
-    if (__value < 0 && __first != __last)
-    {
-        *__first++ = '-';
-        __x = std::__complement(__x);
-    }
-
-    return std::__to_chars_integral(__first, __last, __x, __base, false_type());
-}
-
-namespace __itoa {
-
-template <unsigned _Base>
-struct _LIBCPP_HIDDEN __integral;
-
-template <>
-struct _LIBCPP_HIDDEN __integral<2> {
-  template <typename _Tp>
-  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
-    // If value == 0 still need one digit. If the value != this has no
-    // effect since the code scans for the most significant bit set. (Note
-    // that __libcpp_clz doesn't work for 0.)
-    return numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1);
-  }
-
-  template <typename _Tp>
-  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result __to_chars(char* __first, char* __last, _Tp __value) {
-    ptrdiff_t __cap = __last - __first;
-    int __n = __width(__value);
-    if (__n > __cap)
-      return {__last, errc::value_too_large};
-
-    __last = __first + __n;
-    char* __p = __last;
-    const unsigned __divisor = 16;
-    while (__value > __divisor) {
-      unsigned __c = __value % __divisor;
-      __value /= __divisor;
-      __p -= 4;
-      std::copy_n(&__base_2_lut[4 * __c], 4, __p);
-    }
-    do {
-      unsigned __c = __value % 2;
-      __value /= 2;
-      *--__p = "01"[__c];
-    } while (__value != 0);
-    return {__last, errc(0)};
-  }
-};
-
-template <>
-struct _LIBCPP_HIDDEN __integral<8> {
-  template <typename _Tp>
-  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
-    // If value == 0 still need one digit. If the value != this has no
-    // effect since the code scans for the most significat bit set. (Note
-    // that __libcpp_clz doesn't work for 0.)
-    return ((numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1)) + 2) / 3;
-  }
-
-  template <typename _Tp>
-  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result __to_chars(char* __first, char* __last, _Tp __value) {
-    ptrdiff_t __cap = __last - __first;
-    int __n = __width(__value);
-    if (__n > __cap)
-      return {__last, errc::value_too_large};
-
-    __last = __first + __n;
-    char* __p = __last;
-    unsigned __divisor = 64;
-    while (__value > __divisor) {
-      unsigned __c = __value % __divisor;
-      __value /= __divisor;
-      __p -= 2;
-      std::copy_n(&__base_8_lut[2 * __c], 2, __p);
-    }
-    do {
-      unsigned __c = __value % 8;
-      __value /= 8;
-      *--__p = "01234567"[__c];
-    } while (__value != 0);
-    return {__last, errc(0)};
-  }
-
-};
-
-template <>
-struct _LIBCPP_HIDDEN __integral<16> {
-  template <typename _Tp>
-  _LIBCPP_HIDE_FROM_ABI static constexpr int __width(_Tp __value) noexcept {
-    // If value == 0 still need one digit. If the value != this has no
-    // effect since the code scans for the most significat bit set. (Note
-    // that __libcpp_clz doesn't work for 0.)
-    return (numeric_limits<_Tp>::digits - std::__libcpp_clz(__value | 1) + 3) / 4;
-  }
-
-  template <typename _Tp>
-  _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI static to_chars_result __to_chars(char* __first, char* __last, _Tp __value) {
-    ptrdiff_t __cap = __last - __first;
-    int __n = __width(__value);
-    if (__n > __cap)
-      return {__last, errc::value_too_large};
-
-    __last = __first + __n;
-    char* __p = __last;
-    unsigned __divisor = 256;
-    while (__value > __divisor) {
-      unsigned __c = __value % __divisor;
-      __value /= __divisor;
-      __p -= 2;
-      std::copy_n(&__base_16_lut[2 * __c], 2, __p);
-    }
-    if (__first != __last)
-      do {
-        unsigned __c = __value % 16;
-        __value /= 16;
-        *--__p = "0123456789abcdef"[__c];
-      } while (__value != 0);
-    return {__last, errc(0)};
-  }
-};
-
-} // namespace __itoa
-
-template <unsigned _Base, typename _Tp,
-          typename enable_if<(sizeof(_Tp) >= sizeof(unsigned)), int>::type = 0>
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int
-__to_chars_integral_width(_Tp __value) {
-  return __itoa::__integral<_Base>::__width(__value);
-}
-
-template <unsigned _Base, typename _Tp,
-          typename enable_if<(sizeof(_Tp) < sizeof(unsigned)), int>::type = 0>
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int
-__to_chars_integral_width(_Tp __value) {
-  return std::__to_chars_integral_width<_Base>(static_cast<unsigned>(__value));
-}
-
-template <unsigned _Base, typename _Tp,
-          typename enable_if<(sizeof(_Tp) >= sizeof(unsigned)), int>::type = 0>
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_integral(char* __first, char* __last, _Tp __value) {
-  return __itoa::__integral<_Base>::__to_chars(__first, __last, __value);
-}
-
-template <unsigned _Base, typename _Tp,
-          typename enable_if<(sizeof(_Tp) < sizeof(unsigned)), int>::type = 0>
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_integral(char* __first, char* __last, _Tp __value) {
-  return std::__to_chars_integral<_Base>(__first, __last, static_cast<unsigned>(__value));
-}
-
-template <typename _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI int
-__to_chars_integral_width(_Tp __value, unsigned __base) {
-  _LIBCPP_ASSERT(__value >= 0, "The function requires a non-negative value.");
-
-  unsigned __base_2 = __base * __base;
-  unsigned __base_3 = __base_2 * __base;
-  unsigned __base_4 = __base_2 * __base_2;
-
-  int __r = 0;
-  while (true) {
-    if (__value < __base)
-      return __r + 1;
-    if (__value < __base_2)
-      return __r + 2;
-    if (__value < __base_3)
-      return __r + 3;
-    if (__value < __base_4)
-      return __r + 4;
-
-    __value /= __base_4;
-    __r += 4;
-  }
-
-  __libcpp_unreachable();
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-__to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
-                    false_type)
-{
-  if (__base == 10) [[likely]]
-    return std::__to_chars_itoa(__first, __last, __value, false_type());
-
-  switch (__base) {
-  case 2:
-    return std::__to_chars_integral<2>(__first, __last, __value);
-  case 8:
-    return std::__to_chars_integral<8>(__first, __last, __value);
-  case 16:
-    return std::__to_chars_integral<16>(__first, __last, __value);
-  }
-
-  ptrdiff_t __cap = __last - __first;
-  int __n = std::__to_chars_integral_width(__value, __base);
-  if (__n > __cap)
-    return {__last, errc::value_too_large};
-
-  __last = __first + __n;
-  char* __p = __last;
-  do {
-    unsigned __c = __value % __base;
-    __value /= __base;
-    *--__p = "0123456789abcdefghijklmnopqrstuvwxyz"[__c];
-  } while (__value != 0);
-  return {__last, errc(0)};
-}
-
-template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-to_chars(char* __first, char* __last, _Tp __value)
-{
-  using _Type = __make_32_64_or_128_bit_t<_Tp>;
-  static_assert(!is_same<_Type, void>::value, "unsupported integral type used in to_chars");
-  return std::__to_chars_itoa(__first, __last, static_cast<_Type>(__value), is_signed<_Tp>());
-}
-
-template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI to_chars_result
-to_chars(char* __first, char* __last, _Tp __value, int __base)
-{
-  _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]");
-
-  using _Type = __make_32_64_or_128_bit_t<_Tp>;
-  return std::__to_chars_integral(__first, __last, static_cast<_Type>(__value), __base, is_signed<_Tp>());
-}
-
-template <typename _It, typename _Tp, typename _Fn, typename... _Ts>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__sign_combinator(_It __first, _It __last, _Tp& __value, _Fn __f, _Ts... __args)
-{
-    using __tl = numeric_limits<_Tp>;
-    decltype(std::__to_unsigned_like(__value)) __x;
-
-    bool __neg = (__first != __last && *__first == '-');
-    auto __r = __f(__neg ? __first + 1 : __first, __last, __x, __args...);
-    switch (__r.ec)
-    {
-    case errc::invalid_argument:
-        return {__first, __r.ec};
-    case errc::result_out_of_range:
-        return __r;
-    default:
-        break;
-    }
-
-    if (__neg)
-    {
-        if (__x <= std::__complement(std::__to_unsigned_like(__tl::min())))
-        {
-            __x = std::__complement(__x);
-            std::copy_n(std::addressof(__x), 1, std::addressof(__value));
-            return __r;
-        }
-    }
-    else
-    {
-        if (__x <= std::__to_unsigned_like(__tl::max()))
-        {
-            __value = __x;
-            return __r;
-        }
-    }
-
-    return {__r.ptr, errc::result_out_of_range};
-}
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI bool
-__in_pattern(_Tp __c)
-{
-    return '0' <= __c && __c <= '9';
-}
-
-struct _LIBCPP_HIDDEN __in_pattern_result
-{
-    bool __ok;
-    int __val;
-
-    explicit _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI operator bool() const { return __ok; }
-};
-
-template <typename _Tp>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI __in_pattern_result
-__in_pattern(_Tp __c, int __base)
-{
-    if (__base <= 10)
-        return {'0' <= __c && __c < '0' + __base, __c - '0'};
-    else if (std::__in_pattern(__c))
-        return {true, __c - '0'};
-    else if ('a' <= __c && __c < 'a' + __base - 10)
-        return {true, __c - 'a' + 10};
-    else
-        return {'A' <= __c && __c < 'A' + __base - 10, __c - 'A' + 10};
-}
-
-template <typename _It, typename _Tp, typename _Fn, typename... _Ts>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__subject_seq_combinator(_It __first, _It __last, _Tp& __value, _Fn __f,
-                         _Ts... __args)
-{
-    auto __find_non_zero = [](_It __firstit, _It __lastit) {
-        for (; __firstit != __lastit; ++__firstit)
-            if (*__firstit != '0')
-                break;
-        return __firstit;
-    };
-
-    auto __p = __find_non_zero(__first, __last);
-    if (__p == __last || !std::__in_pattern(*__p, __args...))
-    {
-        if (__p == __first)
-            return {__first, errc::invalid_argument};
-        else
-        {
-            __value = 0;
-            return {__p, {}};
-        }
-    }
-
-    auto __r = __f(__p, __last, __value, __args...);
-    if (__r.ec == errc::result_out_of_range)
-    {
-        for (; __r.ptr != __last; ++__r.ptr)
-        {
-            if (!std::__in_pattern(*__r.ptr, __args...))
-                break;
-        }
-    }
-
-    return __r;
-}
-
-template <typename _Tp, typename enable_if<is_unsigned<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__from_chars_atoi(const char* __first, const char* __last, _Tp& __value)
-{
-    using __tx = __itoa::__traits<_Tp>;
-    using __output_type = typename __tx::type;
-
-    return std::__subject_seq_combinator(
-        __first, __last, __value,
-        [](const char* __f, const char* __l,
-           _Tp& __val) -> from_chars_result {
-            __output_type __a, __b;
-            auto __p = __tx::__read(__f, __l, __a, __b);
-            if (__p == __l || !std::__in_pattern(*__p))
-            {
-                __output_type __m = numeric_limits<_Tp>::max();
-                if (__m >= __a && __m - __a >= __b)
-                {
-                    __val = __a + __b;
-                    return {__p, {}};
-                }
-            }
-            return {__p, errc::result_out_of_range};
-        });
-}
-
-template <typename _Tp, typename enable_if<is_signed<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__from_chars_atoi(const char* __first, const char* __last, _Tp& __value)
-{
-    using __t = decltype(std::__to_unsigned_like(__value));
-    return std::__sign_combinator(__first, __last, __value, __from_chars_atoi<__t>);
-}
-
-
-/*
-// Code used to generate __from_chars_log2f_lut.
-#include <cmath>
-#include <iostream>
-#include <format>
-
-int main() {
-  for (int i = 2; i <= 36; ++i)
-    std::cout << std::format("{},\n", log2f(i));
-}
-*/
-/// log2f table for bases [2, 36].
-inline constexpr float __from_chars_log2f_lut[35] = {
-    1,         1.5849625, 2,         2.321928, 2.5849626, 2.807355, 3,        3.169925,  3.321928,
-    3.4594316, 3.5849626, 3.7004397, 3.807355, 3.9068906, 4,        4.087463, 4.169925,  4.2479277,
-    4.321928,  4.3923173, 4.4594316, 4.523562, 4.5849624, 4.643856, 4.70044,  4.7548876, 4.807355,
-    4.857981,  4.9068904, 4.9541965, 5,        5.044394,  5.087463, 5.129283, 5.169925};
-
-template <typename _Tp, typename enable_if<is_unsigned<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__from_chars_integral(const char* __first, const char* __last, _Tp& __value,
-                      int __base)
-{
-    if (__base == 10)
-        return std::__from_chars_atoi(__first, __last, __value);
-
-    return std::__subject_seq_combinator(
-        __first, __last, __value,
-        [](const char* __p, const char* __lastp, _Tp& __val,
-           int __b) -> from_chars_result {
-            using __tl = numeric_limits<_Tp>;
-            // __base is always between 2 and 36 inclusive.
-            auto __digits = __tl::digits / __from_chars_log2f_lut[__b - 2];
-            _Tp __x = __in_pattern(*__p++, __b).__val, __y = 0;
-
-            for (int __i = 1; __p != __lastp; ++__i, ++__p)
-            {
-                if (auto __c = __in_pattern(*__p, __b))
-                {
-                    if (__i < __digits - 1)
-                        __x = __x * __b + __c.__val;
-                    else
-                    {
-                        if (!__itoa::__mul_overflowed(__x, __b, __x))
-                            ++__p;
-                        __y = __c.__val;
-                        break;
-                    }
-                }
-                else
-                    break;
-            }
-
-            if (__p == __lastp || !__in_pattern(*__p, __b))
-            {
-                if (__tl::max() - __x >= __y)
-                {
-                    __val = __x + __y;
-                    return {__p, {}};
-                }
-            }
-            return {__p, errc::result_out_of_range};
-        },
-        __base);
-}
-
-template <typename _Tp, typename enable_if<is_signed<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-__from_chars_integral(const char* __first, const char* __last, _Tp& __value,
-                      int __base)
-{
-    using __t = decltype(std::__to_unsigned_like(__value));
-    return std::__sign_combinator(__first, __last, __value,
-                                  __from_chars_integral<__t>, __base);
-}
-
-template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-from_chars(const char* __first, const char* __last, _Tp& __value)
-{
-    return std::__from_chars_atoi(__first, __last, __value);
-}
-
-template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX23 _LIBCPP_HIDE_FROM_ABI from_chars_result
-from_chars(const char* __first, const char* __last, _Tp& __value, int __base)
-{
-    _LIBCPP_ASSERT(2 <= __base && __base <= 36, "base not in [2, 36]");
-    return std::__from_chars_integral(__first, __last, __value, __base);
-}
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt, int __precision);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt, int __precision);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt, int __precision);
-
-#endif // _LIBCPP_STD_VER > 14
-
 _LIBCPP_END_NAMESPACE_STD
 
-_LIBCPP_POP_MACROS
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
+#  include <cstring>
 #  include <iosfwd>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_CHARCONV
diff --git a/third_party/llvm-project/libcxx/include/chrono b/third_party/llvm-project/libcxx/include/chrono
index 44073b5..b5d3b03 100644
--- a/third_party/llvm-project/libcxx/include/chrono
+++ b/third_party/llvm-project/libcxx/include/chrono
@@ -182,7 +182,7 @@
    bool operator==(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
 template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr
-   bool operator!=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
+   bool operator!=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs); // removed in C++20
 template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr
    bool operator< (const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
@@ -195,6 +195,10 @@
 template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr
    bool operator>=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
+template<class Rep1, class Period1, class Rep2, class Period2>
+  requires three_way_comparable<typename CT::rep>
+  constexpr auto operator<=>(const duration<Rep1, Period1>& lhs,
+                             const duration<Rep2, Period2>& rhs);                           // since C++20
 
 // duration_cast
 template <class ToDuration, class Rep, class Period>
@@ -231,7 +235,7 @@
 template <class Clock, class Duration1, class Duration2>
    bool operator==(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
 template <class Clock, class Duration1, class Duration2>
-   bool operator!=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
+   bool operator!=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs); // removed in C++20
 template <class Clock, class Duration1, class Duration2>
    bool operator< (const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
 template <class Clock, class Duration1, class Duration2>
@@ -240,6 +244,10 @@
    bool operator> (const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
 template <class Clock, class Duration1, class Duration2>
    bool operator>=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
+template<class Clock, class Duration1,
+         three_way_comparable_with<Duration1> Duration2>
+  constexpr auto operator<=>(const time_point<Clock, Duration1>& lhs,
+                             const time_point<Clock, Duration2>& rhs);                                // since C++20
 
 // time_point_cast (constexpr in C++14)
 
@@ -282,6 +290,10 @@
 using sys_seconds = sys_time<seconds>;                  // C++20
 using sys_days    = sys_time<days>;                     // C++20
 
+template<class charT, class traits, class Duration>     // C++20
+  basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>& os, const sys_time<Duration>& tp);
+
 class file_clock                                        // C++20
 {
 public:
@@ -656,6 +668,10 @@
     constexpr          precision to_duration() const noexcept;
 };
 
+template<class charT, class traits, class Duration>
+  basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>& os, const hh_mm_ss<Duration>& hms); // C++20
+
 // 26.10, 12/24 hour functions
 constexpr bool is_am(hours const& h) noexcept;
 constexpr bool is_pm(hours const& h) noexcept;
@@ -674,6 +690,8 @@
 }  // chrono
 
 namespace std {
+  template<class Duration, class charT>
+    struct formatter<chrono::sys_time<Duration>, charT>;                          // C++20
   template<class Rep, class Period, class charT>
     struct formatter<chrono::duration<Rep, Period>, charT>;                       // C++20
   template<class charT> struct formatter<chrono::day, charT>;                     // C++20
@@ -691,6 +709,8 @@
   template<class charT> struct formatter<chrono::year_month_day_last, charT>;     // C++20
   template<class charT> struct formatter<chrono::year_month_weekday, charT>;      // C++20
   template<class charT> struct formatter<chrono::year_month_weekday_last, charT>; // C++20
+  template<class Rep, class Period, class charT>
+    struct formatter<chrono::hh_mm_ss<duration<Rep, Period>>, charT>;             // C++20
 } // namespace std
 
 namespace chrono {
@@ -769,7 +789,7 @@
 // [time.syn]
 #include <compare>
 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT) && _LIBCPP_STD_VER > 17
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT) && _LIBCPP_STD_VER >= 20
 #  include <__chrono/formatter.h>
 #  include <__chrono/ostream.h>
 #  include <__chrono/parser_std_format_spec.h>
@@ -782,7 +802,13 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <bit>
 #  include <concepts>
+#  include <cstring>
+#endif
+
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER == 20
+#  include <charconv>
 #endif
 
 #endif // _LIBCPP_CHRONO
diff --git a/third_party/llvm-project/libcxx/include/cmath b/third_party/llvm-project/libcxx/include/cmath
index a27d0eb..e815b3a 100644
--- a/third_party/llvm-project/libcxx/include/cmath
+++ b/third_party/llvm-project/libcxx/include/cmath
@@ -311,6 +311,7 @@
 #include <__type_traits/is_constant_evaluated.h>
 #include <__type_traits/is_floating_point.h>
 #include <__type_traits/is_same.h>
+#include <__type_traits/promote.h>
 #include <__type_traits/remove_cv.h>
 #include <version>
 
@@ -543,7 +544,7 @@
 using ::tgammal _LIBCPP_USING_IF_EXISTS;
 using ::truncl _LIBCPP_USING_IF_EXISTS;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 inline _LIBCPP_INLINE_VISIBILITY float       hypot(       float __x,       float __y,       float __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
 inline _LIBCPP_INLINE_VISIBILITY double      hypot(      double __x,      double __y,      double __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
 inline _LIBCPP_INLINE_VISIBILITY long double hypot( long double __x, long double __y, long double __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
@@ -782,7 +783,7 @@
   return __builtin_scalbn(__x, __exp);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <typename _Fp>
 _LIBCPP_HIDE_FROM_ABI constexpr
 _Fp __lerp(_Fp __a, _Fp __b, _Fp __t) noexcept {
@@ -823,7 +824,7 @@
                     _IsSame<_A3, __result_type>::value));
     return std::__lerp((__result_type)__a, (__result_type)__b, (__result_type)__t);
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/compare b/third_party/llvm-project/libcxx/include/compare
index 9272dbf..626c743 100644
--- a/third_party/llvm-project/libcxx/include/compare
+++ b/third_party/llvm-project/libcxx/include/compare
@@ -151,6 +151,7 @@
 #include <__compare/ordering.h>
 #include <__compare/partial_order.h>
 #include <__compare/strong_order.h>
+#include <__compare/synth_three_way.h>
 #include <__compare/three_way_comparable.h>
 #include <__compare/weak_order.h>
 #include <__config>
diff --git a/third_party/llvm-project/libcxx/include/complex b/third_party/llvm-project/libcxx/include/complex
index 760fbaa..26f189d 100644
--- a/third_party/llvm-project/libcxx/include/complex
+++ b/third_party/llvm-project/libcxx/include/complex
@@ -236,7 +236,6 @@
 #include <cmath>
 #include <iosfwd>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
@@ -1522,7 +1521,7 @@
 }
 #endif // !_LIBCPP_HAS_NO_LOCALIZATION
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 // Literal suffix for complex number literals [complex.literals]
 inline namespace literals
 {
@@ -1565,4 +1564,8 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_COMPLEX
diff --git a/third_party/llvm-project/libcxx/include/condition_variable b/third_party/llvm-project/libcxx/include/condition_variable
index f13df1c..4135a20 100644
--- a/third_party/llvm-project/libcxx/include/condition_variable
+++ b/third_party/llvm-project/libcxx/include/condition_variable
@@ -107,10 +107,18 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__chrono/duration.h>
+#include <__chrono/steady_clock.h>
+#include <__chrono/time_point.h>
+#include <__condition_variable/condition_variable.h>
 #include <__config>
 #include <__memory/shared_ptr.h>
 #include <__memory/unique_ptr.h>
-#include <__mutex_base>
+#include <__mutex/lock_guard.h>
+#include <__mutex/mutex.h>
+#include <__mutex/tag_types.h>
+#include <__mutex/unique_lock.h>
+#include <__utility/move.h>
 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -202,7 +210,7 @@
     unique_lock<mutex> __lk(*__mut);
     __lock.unlock();
     unique_ptr<_Lock, __lock_external> __lxx(&__lock);
-    lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock);
+    lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock_t());
     __cv_.wait(__lk);
 }  // __mut_.unlock(), __lock.lock()
 
@@ -224,7 +232,7 @@
     unique_lock<mutex> __lk(*__mut);
     __lock.unlock();
     unique_ptr<_Lock, __lock_external> __lxx(&__lock);
-    lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock);
+    lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock_t());
     return __cv_.wait_until(__lk, __t);
 }  // __mut_.unlock(), __lock.lock()
 
@@ -269,8 +277,17 @@
 #endif // !_LIBCPP_HAS_NO_THREADS
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
+#  include <cstdint>
+#  include <cstdlib>
+#  include <cstring>
+#  include <initializer_list>
+#  include <new>
+#  include <stdexcept>
+#  include <system_error>
 #  include <type_traits>
+#  include <typeinfo>
 #endif
 
 #endif // _LIBCPP_CONDITION_VARIABLE
diff --git a/third_party/llvm-project/libcxx/include/cstddef b/third_party/llvm-project/libcxx/include/cstddef
index e3c0669..a364e6e 100644
--- a/third_party/llvm-project/libcxx/include/cstddef
+++ b/third_party/llvm-project/libcxx/include/cstddef
@@ -66,7 +66,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 namespace std  // purposefully not versioned
 {
 enum class byte : unsigned char {};
diff --git a/third_party/llvm-project/libcxx/include/cstdlib b/third_party/llvm-project/libcxx/include/cstdlib
index 25c9de5..ab2c159 100644
--- a/third_party/llvm-project/libcxx/include/cstdlib
+++ b/third_party/llvm-project/libcxx/include/cstdlib
@@ -144,7 +144,7 @@
 using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
 using ::quick_exit _LIBCPP_USING_IF_EXISTS;
 #endif
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 using ::aligned_alloc _LIBCPP_USING_IF_EXISTS;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/cstring b/third_party/llvm-project/libcxx/include/cstring
index c88d977..a9bdf4f 100644
--- a/third_party/llvm-project/libcxx/include/cstring
+++ b/third_party/llvm-project/libcxx/include/cstring
@@ -100,53 +100,6 @@
 using ::strerror _LIBCPP_USING_IF_EXISTS;
 using ::strlen _LIBCPP_USING_IF_EXISTS;
 
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_strlen(const char* __str) {
-  // GCC currently doesn't support __builtin_strlen for heap-allocated memory during constant evaluation.
-  // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70816
-#ifdef _LIBCPP_COMPILER_GCC
-  if (__libcpp_is_constant_evaluated()) {
-    size_t __i = 0;
-    for (; __str[__i] != '\0'; ++__i)
-      ;
-    return __i;
-  }
-#endif
-  return __builtin_strlen(__str);
-}
-
-template <class _Tp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
-__constexpr_memcmp(const _Tp* __lhs, const _Tp* __rhs, size_t __count) {
-#ifdef _LIBCPP_COMPILER_GCC
-  if (__libcpp_is_constant_evaluated()) {
-    for (; __count; --__count, ++__lhs, ++__rhs) {
-      if (*__lhs < *__rhs)
-        return -1;
-      if (*__rhs < *__lhs)
-        return 1;
-    }
-    return 0;
-  }
-#endif
-  return __builtin_memcmp(__lhs, __rhs, __count);
-}
-
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const char*
-__constexpr_char_memchr(const char* __str, int __char, size_t __count) {
-#if __has_builtin(__builtin_char_memchr)
-  return __builtin_char_memchr(__str, __char, __count);
-#else
-  if (!__libcpp_is_constant_evaluated())
-    return static_cast<const char*>(std::memchr(__str, __char, __count));
-  for (; __count; --__count) {
-    if (*__str == __char)
-      return __str;
-    ++__str;
-  }
-  return nullptr;
-#endif
-}
-
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP_CSTRING
diff --git a/third_party/llvm-project/libcxx/include/ctime b/third_party/llvm-project/libcxx/include/ctime
index 2293675..b61e19d 100644
--- a/third_party/llvm-project/libcxx/include/ctime
+++ b/third_party/llvm-project/libcxx/include/ctime
@@ -66,7 +66,7 @@
 using ::size_t _LIBCPP_USING_IF_EXISTS;
 using ::time_t _LIBCPP_USING_IF_EXISTS;
 using ::tm _LIBCPP_USING_IF_EXISTS;
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 using ::timespec _LIBCPP_USING_IF_EXISTS;
 #endif
 using ::clock _LIBCPP_USING_IF_EXISTS;
@@ -78,7 +78,7 @@
 using ::gmtime _LIBCPP_USING_IF_EXISTS;
 using ::localtime _LIBCPP_USING_IF_EXISTS;
 using ::strftime _LIBCPP_USING_IF_EXISTS;
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 using ::timespec_get _LIBCPP_USING_IF_EXISTS;
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/deque b/third_party/llvm-project/libcxx/include/deque
index f2b8076..515c960 100644
--- a/third_party/llvm-project/libcxx/include/deque
+++ b/third_party/llvm-project/libcxx/include/deque
@@ -134,15 +134,18 @@
 template <class T, class Allocator>
     bool operator==(const deque<T,Allocator>& x, const deque<T,Allocator>& y);
 template <class T, class Allocator>
-    bool operator< (const deque<T,Allocator>& x, const deque<T,Allocator>& y);
+    bool operator< (const deque<T,Allocator>& x, const deque<T,Allocator>& y); // removed in C++20
 template <class T, class Allocator>
-    bool operator!=(const deque<T,Allocator>& x, const deque<T,Allocator>& y);
+    bool operator!=(const deque<T,Allocator>& x, const deque<T,Allocator>& y); // removed in C++20
 template <class T, class Allocator>
-    bool operator> (const deque<T,Allocator>& x, const deque<T,Allocator>& y);
+    bool operator> (const deque<T,Allocator>& x, const deque<T,Allocator>& y); // removed in C++20
 template <class T, class Allocator>
-    bool operator>=(const deque<T,Allocator>& x, const deque<T,Allocator>& y);
+    bool operator>=(const deque<T,Allocator>& x, const deque<T,Allocator>& y); // removed in C++20
 template <class T, class Allocator>
-    bool operator<=(const deque<T,Allocator>& x, const deque<T,Allocator>& y);
+    bool operator<=(const deque<T,Allocator>& x, const deque<T,Allocator>& y); // removed in C++20
+template<class T, class Allocator>
+    synth-three-way-result<T> operator<=>(const deque<T, Allocator>& x,
+                                          const deque<T, Allocator>& y);       // since C++20
 
 // specialized algorithms:
 template <class T, class Allocator>
@@ -165,6 +168,7 @@
 #include <__algorithm/equal.h>
 #include <__algorithm/fill_n.h>
 #include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/lexicographical_compare_three_way.h>
 #include <__algorithm/min.h>
 #include <__algorithm/remove.h>
 #include <__algorithm/remove_if.h>
@@ -177,6 +181,7 @@
 #include <__iterator/prev.h>
 #include <__iterator/reverse_iterator.h>
 #include <__iterator/segmented_iterator.h>
+#include <__memory/addressof.h>
 #include <__memory/allocator_destructor.h>
 #include <__memory/pointer_traits.h>
 #include <__memory/temp_value.h>
@@ -184,12 +189,14 @@
 #include <__memory_resource/polymorphic_allocator.h>
 #include <__split_buffer>
 #include <__type_traits/is_allocator.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <limits>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -249,7 +256,7 @@
     typedef _Reference                  reference;
 
     _LIBCPP_HIDE_FROM_ABI __deque_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
      : __m_iter_(nullptr), __ptr_(nullptr)
 #endif
      {}
@@ -564,7 +571,7 @@
         : __map_(__pointer_allocator(__a)), __start_(0), __size_(0, __a) {}
 
     explicit _LIBCPP_HIDE_FROM_ABI deque(size_type __n);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     explicit _LIBCPP_HIDE_FROM_ABI deque(size_type __n, const _Allocator& __a);
 #endif
     _LIBCPP_HIDE_FROM_ABI deque(size_type __n, const value_type& __v);
@@ -713,7 +720,7 @@
     _LIBCPP_HIDE_FROM_ABI void push_front(const value_type& __v);
     _LIBCPP_HIDE_FROM_ABI void push_back(const value_type& __v);
 #ifndef _LIBCPP_CXX03_LANG
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     template <class... _Args> _LIBCPP_HIDE_FROM_ABI reference emplace_front(_Args&&... __args);
     template <class... _Args> _LIBCPP_HIDE_FROM_ABI reference emplace_back (_Args&&... __args);
 #else
@@ -952,7 +959,7 @@
         __append(__n);
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp, class _Allocator>
 deque<_Tp, _Allocator>::deque(size_type __n, const _Allocator& __a)
     : __map_(__pointer_allocator(__a)), __start_(0), __size_(0, __a)
@@ -1314,7 +1321,7 @@
 
 template <class _Tp, class _Allocator>
 template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename deque<_Tp, _Allocator>::reference
 #else
 void
@@ -1328,7 +1335,7 @@
     __alloc_traits::construct(__a, _VSTD::addressof(*end()),
                               _VSTD::forward<_Args>(__args)...);
     ++__size();
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return *--end();
 #endif
 }
@@ -1349,7 +1356,7 @@
 
 template <class _Tp, class _Allocator>
 template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename deque<_Tp, _Allocator>::reference
 #else
 void
@@ -1363,7 +1370,7 @@
     __alloc_traits::construct(__a, _VSTD::addressof(*--begin()), _VSTD::forward<_Args>(__args)...);
     --__start_;
     ++__size();
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return *begin();
 #endif
 }
@@ -1879,13 +1886,13 @@
             __buf(std::max<size_type>(2* __map_.capacity(),
                                       __nb + __map_.size()),
                   0, __map_.__alloc());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (; __nb > 0; --__nb)
                 __buf.push_back(__alloc_traits::allocate(__a, __block_size));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1894,7 +1901,7 @@
                 __alloc_traits::deallocate(__a, *__i, __block_size);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         for (; __back_capacity > 0; --__back_capacity)
         {
             __buf.push_back(__map_.back());
@@ -2021,13 +2028,13 @@
                                       __nb + __map_.size()),
                   __map_.size() - __front_capacity,
                   __map_.__alloc());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (; __nb > 0; --__nb)
                 __buf.push_back(__alloc_traits::allocate(__a, __block_size));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -2036,7 +2043,7 @@
                 __alloc_traits::deallocate(__a, *__i, __block_size);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         for (; __front_capacity > 0; --__front_capacity)
         {
             __buf.push_back(__map_.front());
@@ -2342,6 +2349,8 @@
     return __sz == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Allocator>
 inline _LIBCPP_HIDE_FROM_ABI
 bool
@@ -2382,6 +2391,19 @@
     return !(__y < __x);
 }
 
+#else // _LIBCPP_STD_VER <= 17
+
+template<class _Tp, class _Allocator>
+inline _LIBCPP_HIDE_FROM_ABI
+__synth_three_way_result<_Tp>
+operator<=>(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
+{
+    return std::lexicographical_compare_three_way(
+        __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way<_Tp, _Tp>);
+}
+
+#endif // _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Allocator>
 inline _LIBCPP_HIDE_FROM_ABI
 void
@@ -2391,7 +2413,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, class _Allocator, class _Up>
 inline _LIBCPP_HIDE_FROM_ABI typename deque<_Tp, _Allocator>::size_type
 erase(deque<_Tp, _Allocator>& __c, const _Up& __v) {
@@ -2415,11 +2437,11 @@
 inline constexpr bool __format::__enable_insertable<std::deque<wchar_t>> = true;
 #endif
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _ValueT>
@@ -2434,9 +2456,11 @@
 #  include <algorithm>
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iosfwd>
 #  include <iterator>
+#  include <type_traits>
 #  include <typeinfo>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/exception b/third_party/llvm-project/libcxx/include/exception
index e0f4268..97fee97 100644
--- a/third_party/llvm-project/libcxx/include/exception
+++ b/third_party/llvm-project/libcxx/include/exception
@@ -77,307 +77,20 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
-#include <__availability>
 #include <__config>
-#include <__memory/addressof.h>
-#include <__type_traits/decay.h>
-#include <__type_traits/is_base_of.h>
-#include <__type_traits/is_class.h>
-#include <__type_traits/is_convertible.h>
-#include <__type_traits/is_copy_constructible.h>
-#include <__type_traits/is_final.h>
-#include <__type_traits/is_polymorphic.h>
-#include <cstddef>
-#include <cstdlib>
+#include <__exception/exception.h>
+#include <__exception/exception_ptr.h>
+#include <__exception/nested_exception.h>
+#include <__exception/operations.h>
+#include <__exception/terminate.h>
 #include <version>
 
-// <vcruntime_exception.h> defines its own std::exception and std::bad_exception types,
-// which we use in order to be ABI-compatible with other STLs on Windows.
-#if defined(_LIBCPP_ABI_VCRUNTIME)
-#  include <vcruntime_exception.h>
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-namespace std  // purposefully not using versioning namespace
-{
-
-#if defined(_LIBCPP_ABI_VCRUNTIME) && (!defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS != 0)
-// The std::exception class was already included above, but we're explicit about this condition here for clarity.
-
-#elif defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0
-// However, <vcruntime_exception.h> does not define std::exception and std::bad_exception
-// when _HAS_EXCEPTIONS == 0.
-//
-// Since libc++ still wants to provide the std::exception hierarchy even when _HAS_EXCEPTIONS == 0
-// (after all those are simply types like any other), we define an ABI-compatible version
-// of the VCRuntime std::exception and std::bad_exception types in that mode.
-
-struct __std_exception_data {
-  char const* _What;
-  bool _DoFree;
-};
-
-class exception { // base of all library exceptions
-public:
-  exception() _NOEXCEPT : __data_() {}
-
-  explicit exception(char const* __message) _NOEXCEPT : __data_() {
-    __data_._What = __message;
-    __data_._DoFree = true;
-  }
-
-  exception(exception const&) _NOEXCEPT {}
-
-  exception& operator=(exception const&) _NOEXCEPT { return *this; }
-
-  virtual ~exception() _NOEXCEPT {}
-
-  virtual char const* what() const _NOEXCEPT { return __data_._What ? __data_._What : "Unknown exception"; }
-
-private:
-  __std_exception_data __data_;
-};
-
-class bad_exception : public exception {
-public:
-  bad_exception() _NOEXCEPT : exception("bad exception") {}
-};
-
-#else // !defined(_LIBCPP_ABI_VCRUNTIME)
-// On all other platforms, we define our own std::exception and std::bad_exception types
-// regardless of whether exceptions are turned on as a language feature.
-
-class _LIBCPP_EXCEPTION_ABI exception {
-public:
-  _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
-  _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;
-
-  virtual ~exception() _NOEXCEPT;
-  virtual const char* what() const _NOEXCEPT;
-};
-
-class _LIBCPP_EXCEPTION_ABI bad_exception : public exception {
-public:
-  _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
-  ~bad_exception() _NOEXCEPT override;
-  const char* what() const _NOEXCEPT override;
-};
-#endif // !_LIBCPP_ABI_VCRUNTIME
-
-#if _LIBCPP_STD_VER <= 14 \
-    || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \
-    || defined(_LIBCPP_BUILDING_LIBRARY)
-typedef void (*unexpected_handler)();
-_LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
-_LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
-#endif
-
-typedef void (*terminate_handler)();
-_LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
-_LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;
-
-_LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
-_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;
-
-class _LIBCPP_TYPE_VIS exception_ptr;
-
-_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
-
-#ifndef _LIBCPP_ABI_MICROSOFT
-
-class _LIBCPP_TYPE_VIS exception_ptr
-{
-    void* __ptr_;
-public:
-    _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
-    _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
-
-    exception_ptr(const exception_ptr&) _NOEXCEPT;
-    exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
-    ~exception_ptr() _NOEXCEPT;
-
-    _LIBCPP_INLINE_VISIBILITY explicit operator bool() const _NOEXCEPT
-    {return __ptr_ != nullptr;}
-
-    friend _LIBCPP_INLINE_VISIBILITY
-    bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
-        {return __x.__ptr_ == __y.__ptr_;}
-
-    friend _LIBCPP_INLINE_VISIBILITY
-    bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
-        {return !(__x == __y);}
-
-    friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
-    friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
-};
-
-template<class _Ep>
-_LIBCPP_INLINE_VISIBILITY exception_ptr
-make_exception_ptr(_Ep __e) _NOEXCEPT
-{
-#ifndef _LIBCPP_NO_EXCEPTIONS
-    try
-    {
-        throw __e;
-    }
-    catch (...)
-    {
-        return current_exception();
-    }
-#else
-    ((void)__e);
-    _VSTD::abort();
-#endif
-}
-
-#else // _LIBCPP_ABI_MICROSOFT
-
-class _LIBCPP_TYPE_VIS exception_ptr
-{
-_LIBCPP_DIAGNOSTIC_PUSH
-_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")
-    void* __ptr1_;
-    void* __ptr2_;
-_LIBCPP_DIAGNOSTIC_POP
-public:
-    exception_ptr() _NOEXCEPT;
-    exception_ptr(nullptr_t) _NOEXCEPT;
-    exception_ptr(const exception_ptr& __other) _NOEXCEPT;
-    exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
-    exception_ptr& operator=(nullptr_t) _NOEXCEPT;
-    ~exception_ptr() _NOEXCEPT;
-    explicit operator bool() const _NOEXCEPT;
-};
-
-_LIBCPP_FUNC_VIS
-bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
-    {return !(__x == __y);}
-
-_LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
-
-_LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr);
-_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
-
-// This is a built-in template function which automagically extracts the required
-// information.
-template <class _E> void *__GetExceptionInfo(_E);
-
-template<class _Ep>
-_LIBCPP_INLINE_VISIBILITY exception_ptr
-make_exception_ptr(_Ep __e) _NOEXCEPT
-{
-  return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));
-}
-
-#endif // _LIBCPP_ABI_MICROSOFT
-// nested_exception
-
-class _LIBCPP_EXCEPTION_ABI nested_exception
-{
-    exception_ptr __ptr_;
-public:
-    nested_exception() _NOEXCEPT;
-//     nested_exception(const nested_exception&) noexcept = default;
-//     nested_exception& operator=(const nested_exception&) noexcept = default;
-    virtual ~nested_exception() _NOEXCEPT;
-
-    // access functions
-    _LIBCPP_NORETURN void rethrow_nested() const;
-    _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}
-};
-
-template <class _Tp>
-struct __nested
-    : public _Tp,
-      public nested_exception
-{
-    _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
-};
-
-#ifndef _LIBCPP_NO_EXCEPTIONS
-template <class _Tp, class _Up, bool>
-struct __throw_with_nested;
-
-template <class _Tp, class _Up>
-struct __throw_with_nested<_Tp, _Up, true> {
-    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
-    __do_throw(_Tp&& __t)
-    {
-        throw __nested<_Up>(static_cast<_Tp&&>(__t));
-    }
-};
-
-template <class _Tp, class _Up>
-struct __throw_with_nested<_Tp, _Up, false> {
-    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
-#ifndef _LIBCPP_CXX03_LANG
-    __do_throw(_Tp&& __t)
-#else
-    __do_throw (_Tp& __t)
-#endif // _LIBCPP_CXX03_LANG
-    {
-        throw static_cast<_Tp&&>(__t);
-    }
-};
-#endif
-
-template <class _Tp>
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI
-void
-throw_with_nested(_Tp&& __t)
-{
-#ifndef _LIBCPP_NO_EXCEPTIONS
-    typedef typename decay<_Tp>::type _Up;
-    static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
-    __throw_with_nested<_Tp, _Up,
-        is_class<_Up>::value &&
-        !is_base_of<nested_exception, _Up>::value &&
-        !__libcpp_is_final<_Up>::value>::
-            __do_throw(static_cast<_Tp&&>(__t));
-#else
-    ((void)__t);
-    // FIXME: Make this abort
-#endif
-}
-
-template <class _From, class _To>
-struct __can_dynamic_cast : _BoolConstant<
-              is_polymorphic<_From>::value &&
-                 (!is_base_of<_To, _From>::value ||
-                   is_convertible<const _From*, const _To*>::value)> {};
-
-template <class _Ep>
-inline _LIBCPP_INLINE_VISIBILITY
-void
-rethrow_if_nested(const _Ep& __e,
-                  __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value>* = 0)
-{
-    const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e));
-    if (__nep)
-        __nep->rethrow_nested();
-}
-
-template <class _Ep>
-inline _LIBCPP_INLINE_VISIBILITY
-void
-rethrow_if_nested(const _Ep&,
-                  __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value>* = 0)
-{
-}
-
-} // namespace std
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
 #  include <type_traits>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/experimental/__config b/third_party/llvm-project/libcxx/include/experimental/__config
index a71b348c..839b80a 100644
--- a/third_party/llvm-project/libcxx/include/experimental/__config
+++ b/third_party/llvm-project/libcxx/include/experimental/__config
@@ -32,18 +32,6 @@
 #define _LIBCPP_END_NAMESPACE_LFTS_PMR _LIBCPP_END_NAMESPACE_LFTS }
 #define _VSTD_LFTS_PMR _VSTD_LFTS::pmr
 
-#if !defined(__cpp_coroutines) || __cpp_coroutines < 201703L
-#define _LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES
-#endif
-
-#define _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_COROUTINES \
-  _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL inline namespace coroutines_v1 {
-
-#define _LIBCPP_END_NAMESPACE_EXPERIMENTAL_COROUTINES \
-  } _LIBCPP_END_NAMESPACE_EXPERIMENTAL
-
-#define _VSTD_CORO _VSTD_EXPERIMENTAL::coroutines_v1
-
 #define _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_SIMD \
     _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL inline namespace parallelism_v2 {
 
diff --git a/third_party/llvm-project/libcxx/include/experimental/__memory b/third_party/llvm-project/libcxx/include/experimental/__memory
index b36f31e..b113696 100644
--- a/third_party/llvm-project/libcxx/include/experimental/__memory
+++ b/third_party/llvm-project/libcxx/include/experimental/__memory
@@ -12,9 +12,12 @@
 
 #include <__memory/allocator_arg_t.h>
 #include <__memory/uses_allocator.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_same.h>
 #include <experimental/__config>
 #include <experimental/utility> // for erased_type
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -90,7 +93,7 @@
 inline _LIBCPP_INLINE_VISIBILITY
 void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
 {
-    new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...);
+    new (__storage) _Tp (allocator_arg_t(), __a, _VSTD::forward<_Args>(__args)...);
 }
 
 // FIXME: This should have a version which takes a non-const alloc.
diff --git a/third_party/llvm-project/libcxx/include/experimental/algorithm b/third_party/llvm-project/libcxx/include/experimental/algorithm
deleted file mode 100644
index e0ca3c7..0000000
--- a/third_party/llvm-project/libcxx/include/experimental/algorithm
+++ /dev/null
@@ -1,53 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_EXPERIMENTAL_ALGORITHM
-#define _LIBCPP_EXPERIMENTAL_ALGORITHM
-
-/*
-   experimental/algorithm synopsis
-
-#include <algorithm>
-
-namespace std {
-namespace experimental {
-inline namespace fundamentals_v1 {
-
-template <class ForwardIterator, class Searcher>
-ForwardIterator search(ForwardIterator first, ForwardIterator last,
-                       const Searcher &searcher);
-
-// sample removed because it's now part of C++17
-
-} // namespace fundamentals_v1
-} // namespace experimental
-} // namespace std
-
-*/
-
-#include <__assert> // all public C++ headers provide the assertion handler
-#include <__debug>
-#include <algorithm>
-#include <experimental/__config>
-#include <type_traits>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_LFTS
-
-template <class _ForwardIterator, class _Searcher>
-_LIBCPP_INLINE_VISIBILITY
-_ForwardIterator search(_ForwardIterator __f, _ForwardIterator __l, const _Searcher &__s)
-{ return __s(__f, __l).first; }
-
-_LIBCPP_END_NAMESPACE_LFTS
-
-#endif /* _LIBCPP_EXPERIMENTAL_ALGORITHM */
diff --git a/third_party/llvm-project/libcxx/include/experimental/coroutine b/third_party/llvm-project/libcxx/include/experimental/coroutine
deleted file mode 100644
index d9f3685..0000000
--- a/third_party/llvm-project/libcxx/include/experimental/coroutine
+++ /dev/null
@@ -1,344 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_EXPERIMENTAL_COROUTINE
-#define _LIBCPP_EXPERIMENTAL_COROUTINE
-
-/**
-    experimental/coroutine synopsis
-
-// C++next
-
-namespace std {
-namespace experimental {
-inline namespace coroutines_v1 {
-
-  // 18.11.1 coroutine traits
-template <typename R, typename... ArgTypes>
-class coroutine_traits;
-// 18.11.2 coroutine handle
-template <typename Promise = void>
-class coroutine_handle;
-// 18.11.2.7 comparison operators:
-bool operator==(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-bool operator!=(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-bool operator<(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-bool operator<=(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-bool operator>=(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-bool operator>(coroutine_handle<> x, coroutine_handle<> y) _NOEXCEPT;
-// 18.11.3 trivial awaitables
-struct suspend_never;
-struct suspend_always;
-// 18.11.2.8 hash support:
-template <class T> struct hash;
-template <class P> struct hash<coroutine_handle<P>>;
-
-} // namespace coroutines_v1
-} // namespace experimental
-} // namespace std
-
- */
-
-#include <__assert> // all public C++ headers provide the assertion handler
-#include <__functional/hash.h>
-#include <__functional/operations.h>
-#include <cstddef>
-#include <experimental/__config>
-#include <new>
-#include <type_traits>
-
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <atomic>
-#  include <climits>
-#  include <cmath>
-#  include <compare>
-#  include <concepts>
-#  include <ctime>
-#  include <initializer_list>
-#  include <iosfwd>
-#  include <iterator>
-#  include <memory>
-#  include <ratio>
-#  include <stdexcept>
-#  include <tuple>
-#  include <typeinfo>
-#  include <utility>
-#  include <variant>
-#endif
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-#ifndef _LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES
-
-_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_COROUTINES
-
-template <class _Tp, class = void>
-struct __coroutine_traits_sfinae {};
-
-template <class _Tp>
-struct __coroutine_traits_sfinae<_Tp, __void_t<typename _Tp::promise_type> >
-{
-  using promise_type = typename _Tp::promise_type;
-};
-
-template <typename _Ret, typename... _Args>
-struct coroutine_traits
-    : public __coroutine_traits_sfinae<_Ret>
-{
-};
-
-template <typename _Promise = void>
-class _LIBCPP_TEMPLATE_VIS coroutine_handle;
-
-template <>
-class _LIBCPP_TEMPLATE_VIS coroutine_handle<void> {
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR coroutine_handle() _NOEXCEPT : __handle_(nullptr) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR coroutine_handle(nullptr_t) _NOEXCEPT : __handle_(nullptr) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    coroutine_handle& operator=(nullptr_t) _NOEXCEPT {
-        __handle_ = nullptr;
-        return *this;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR void* address() const _NOEXCEPT { return __handle_; }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR explicit operator bool() const _NOEXCEPT { return __handle_; }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void operator()() { resume(); }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void resume() {
-      _LIBCPP_ASSERT(__is_suspended(),
-                     "resume() can only be called on suspended coroutines");
-      _LIBCPP_ASSERT(!done(),
-                "resume() has undefined behavior when the coroutine is done");
-      __builtin_coro_resume(__handle_);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void destroy() {
-      _LIBCPP_ASSERT(__is_suspended(),
-                     "destroy() can only be called on suspended coroutines");
-      __builtin_coro_destroy(__handle_);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool done() const {
-      _LIBCPP_ASSERT(__is_suspended(),
-                     "done() can only be called on suspended coroutines");
-      return __builtin_coro_done(__handle_);
-    }
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    static coroutine_handle from_address(void* __addr) _NOEXCEPT {
-        coroutine_handle __tmp;
-        __tmp.__handle_ = __addr;
-        return __tmp;
-    }
-
-    // FIXME: Should from_address(nullptr) be allowed?
-    _LIBCPP_INLINE_VISIBILITY
-    static coroutine_handle from_address(nullptr_t) _NOEXCEPT {
-      return coroutine_handle(nullptr);
-    }
-
-    template <class _Tp, bool _CallIsValid = false>
-    static coroutine_handle from_address(_Tp*) {
-      static_assert(_CallIsValid,
-       "coroutine_handle<void>::from_address cannot be called with "
-        "non-void pointers");
-    }
-
-private:
-  bool __is_suspended() const _NOEXCEPT  {
-    // FIXME actually implement a check for if the coro is suspended.
-    return __handle_;
-  }
-
-  template <class _PromiseT> friend class coroutine_handle;
-  void* __handle_;
-};
-
-// 18.11.2.7 comparison operators:
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator==(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return __x.address() == __y.address();
-}
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator!=(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return !(__x == __y);
-}
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator<(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return less<void*>()(__x.address(), __y.address());
-}
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator>(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return __y < __x;
-}
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator<=(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return !(__x > __y);
-}
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator>=(coroutine_handle<> __x, coroutine_handle<> __y) _NOEXCEPT {
-    return !(__x < __y);
-}
-
-template <typename _Promise>
-class _LIBCPP_TEMPLATE_VIS coroutine_handle : public coroutine_handle<> {
-    using _Base = coroutine_handle<>;
-public:
-#ifndef _LIBCPP_CXX03_LANG
-    // 18.11.2.1 construct/reset
-    using coroutine_handle<>::coroutine_handle;
-#else
-    _LIBCPP_INLINE_VISIBILITY coroutine_handle() _NOEXCEPT : _Base() {}
-    _LIBCPP_INLINE_VISIBILITY coroutine_handle(nullptr_t) _NOEXCEPT : _Base(nullptr) {}
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    coroutine_handle& operator=(nullptr_t) _NOEXCEPT {
-        _Base::operator=(nullptr);
-        return *this;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    _Promise& promise() const {
-        return *static_cast<_Promise*>(
-            __builtin_coro_promise(this->__handle_, _LIBCPP_ALIGNOF(_Promise), false));
-    }
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    static coroutine_handle from_address(void* __addr) _NOEXCEPT {
-        coroutine_handle __tmp;
-        __tmp.__handle_ = __addr;
-        return __tmp;
-    }
-
-    // NOTE: this overload isn't required by the standard but is needed so
-    // the deleted _Promise* overload doesn't make from_address(nullptr)
-    // ambiguous.
-    // FIXME: should from_address work with nullptr?
-    _LIBCPP_INLINE_VISIBILITY
-    static coroutine_handle from_address(nullptr_t) _NOEXCEPT {
-      return coroutine_handle(nullptr);
-    }
-
-    template <class _Tp, bool _CallIsValid = false>
-    static coroutine_handle from_address(_Tp*) {
-      static_assert(_CallIsValid,
-       "coroutine_handle<promise_type>::from_address cannot be called with "
-        "non-void pointers");
-    }
-
-    template <bool _CallIsValid = false>
-    static coroutine_handle from_address(_Promise*) {
-      static_assert(_CallIsValid,
-       "coroutine_handle<promise_type>::from_address cannot be used with "
-        "pointers to the coroutine's promise type; use 'from_promise' instead");
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    static coroutine_handle from_promise(_Promise& __promise) _NOEXCEPT {
-        typedef __remove_cv_t<_Promise> _RawPromise;
-        coroutine_handle __tmp;
-        __tmp.__handle_ = __builtin_coro_promise(
-            _VSTD::addressof(const_cast<_RawPromise&>(__promise)),
-             _LIBCPP_ALIGNOF(_Promise), true);
-        return __tmp;
-    }
-};
-
-#if __has_builtin(__builtin_coro_noop)
-struct noop_coroutine_promise {};
-
-template <>
-class _LIBCPP_TEMPLATE_VIS coroutine_handle<noop_coroutine_promise>
-    : public coroutine_handle<> {
-  using _Base = coroutine_handle<>;
-  using _Promise = noop_coroutine_promise;
-public:
-
-  _LIBCPP_INLINE_VISIBILITY
-  _Promise& promise() const {
-    return *static_cast<_Promise*>(
-      __builtin_coro_promise(this->__handle_, _LIBCPP_ALIGNOF(_Promise), false));
-  }
-
-  _LIBCPP_CONSTEXPR explicit operator bool() const _NOEXCEPT { return true; }
-  _LIBCPP_CONSTEXPR bool done() const _NOEXCEPT { return false; }
-
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 void operator()() const _NOEXCEPT {}
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 void resume() const _NOEXCEPT {}
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 void destroy() const _NOEXCEPT {}
-
-private:
-  _LIBCPP_INLINE_VISIBILITY
-  friend coroutine_handle<noop_coroutine_promise> noop_coroutine() _NOEXCEPT;
-
-  _LIBCPP_INLINE_VISIBILITY coroutine_handle() _NOEXCEPT {
-    this->__handle_ = __builtin_coro_noop();
-  }
-};
-
-using noop_coroutine_handle = coroutine_handle<noop_coroutine_promise>;
-
-inline _LIBCPP_INLINE_VISIBILITY
-noop_coroutine_handle noop_coroutine() _NOEXCEPT {
-  return noop_coroutine_handle();
-}
-#endif // __has_builtin(__builtin_coro_noop)
-
-struct suspend_never {
-  _LIBCPP_INLINE_VISIBILITY
-  bool await_ready() const _NOEXCEPT { return true; }
-  _LIBCPP_INLINE_VISIBILITY
-  void await_suspend(coroutine_handle<>) const _NOEXCEPT {}
-  _LIBCPP_INLINE_VISIBILITY
-  void await_resume() const _NOEXCEPT {}
-};
-
-struct suspend_always {
-  _LIBCPP_INLINE_VISIBILITY
-  bool await_ready() const _NOEXCEPT { return false; }
-  _LIBCPP_INLINE_VISIBILITY
-  void await_suspend(coroutine_handle<>) const _NOEXCEPT {}
-  _LIBCPP_INLINE_VISIBILITY
-  void await_resume() const _NOEXCEPT {}
-};
-
-_LIBCPP_END_NAMESPACE_EXPERIMENTAL_COROUTINES
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-template <class _Tp>
-struct hash<_VSTD_CORO::coroutine_handle<_Tp> > {
-    using __arg_type = _VSTD_CORO::coroutine_handle<_Tp>;
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(__arg_type const& __v) const _NOEXCEPT
-    {return hash<void*>()(__v.address());}
-};
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-
-#endif /* _LIBCPP_EXPERIMENTAL_COROUTINE */
diff --git a/third_party/llvm-project/libcxx/include/experimental/functional b/third_party/llvm-project/libcxx/include/experimental/functional
deleted file mode 100644
index cb9a5ef..0000000
--- a/third_party/llvm-project/libcxx/include/experimental/functional
+++ /dev/null
@@ -1,436 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_EXPERIMENTAL_FUNCTIONAL
-#define _LIBCPP_EXPERIMENTAL_FUNCTIONAL
-
-/*
-   experimental/functional synopsis
-
-#include <algorithm>
-
-namespace std {
-namespace experimental {
-inline namespace fundamentals_v1 {
-    // 4.3, Searchers
-    template<class ForwardIterator, class BinaryPredicate = equal_to<>>
-      class default_searcher;
-
-    template<class RandomAccessIterator,
-             class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
-             class BinaryPredicate = equal_to<>>
-      class boyer_moore_searcher;
-
-    template<class RandomAccessIterator,
-             class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
-             class BinaryPredicate = equal_to<>>
-      class boyer_moore_horspool_searcher;
-
-    template<class ForwardIterator, class BinaryPredicate = equal_to<>>
-    default_searcher<ForwardIterator, BinaryPredicate>
-    make_default_searcher(ForwardIterator pat_first, ForwardIterator pat_last,
-                          BinaryPredicate pred = BinaryPredicate());
-
-    template<class RandomAccessIterator,
-             class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
-             class BinaryPredicate = equal_to<>>
-    boyer_moore_searcher<RandomAccessIterator, Hash, BinaryPredicate>
-    make_boyer_moore_searcher(
-        RandomAccessIterator pat_first, RandomAccessIterator pat_last,
-        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-
-    template<class RandomAccessIterator,
-             class Hash = hash<typename iterator_traits<RandomAccessIterator>::value_type>,
-             class BinaryPredicate = equal_to<>>
-    boyer_moore_horspool_searcher<RandomAccessIterator, Hash, BinaryPredicate>
-    make_boyer_moore_horspool_searcher(
-        RandomAccessIterator pat_first, RandomAccessIterator pat_last,
-        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-
-  } // namespace fundamentals_v1
-  } // namespace experimental
-
-} // namespace std
-
-*/
-
-#include <__assert> // all public C++ headers provide the assertion handler
-#include <__debug>
-#include <__functional/identity.h>
-#include <__memory/uses_allocator.h>
-#include <array>
-#include <experimental/__config>
-#include <functional>
-#include <type_traits>
-#include <unordered_map>
-#include <vector>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_PUSH_MACROS
-#include <__undef_macros>
-
-_LIBCPP_BEGIN_NAMESPACE_LFTS
-
-#ifdef _LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-#  define _LIBCPP_DEPRECATED_DEFAULT_SEARCHER
-#  define _LIBCPP_DEPRECATED_BOYER_MOORE_SEARCHER
-#  define _LIBCPP_DEPRECATED_BOYER_MOORE_HORSPOOL_SEARCHER
-#else
-#  define _LIBCPP_DEPRECATED_DEFAULT_SEARCHER _LIBCPP_DEPRECATED_("std::experimental::default_searcher will be removed in LLVM 17. Use std::default_searcher instead")
-#  define _LIBCPP_DEPRECATED_BOYER_MOORE_SEARCHER _LIBCPP_DEPRECATED_("std::experimental::boyer_moore_searcher will be removed in LLVM 17. Use std::boyer_moore_searcher instead")
-#  define _LIBCPP_DEPRECATED_BOYER_MOORE_HORSPOOL_SEARCHER _LIBCPP_DEPRECATED_("std::experimental::boyer_moore_horspool_searcher will be removed in LLVM 17. Use std::boyer_moore_horspool_searcher instead")
-#endif
-
-#if _LIBCPP_STD_VER > 11
-// default searcher
-template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
-class _LIBCPP_DEPRECATED_DEFAULT_SEARCHER _LIBCPP_TEMPLATE_VIS default_searcher {
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    default_searcher(_ForwardIterator __f, _ForwardIterator __l,
-                       _BinaryPredicate __p = _BinaryPredicate())
-        : __first_(__f), __last_(__l), __pred_(__p) {}
-
-    template <typename _ForwardIterator2>
-    _LIBCPP_INLINE_VISIBILITY
-    pair<_ForwardIterator2, _ForwardIterator2>
-    operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const
-    {
-        auto __proj = __identity();
-        return std::__search_impl(__f, __l, __first_, __last_, __pred_, __proj, __proj);
-    }
-
-private:
-    _ForwardIterator __first_;
-    _ForwardIterator __last_;
-    _BinaryPredicate __pred_;
-    };
-
-template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
-_LIBCPP_DEPRECATED_DEFAULT_SEARCHER _LIBCPP_INLINE_VISIBILITY
-default_searcher<_ForwardIterator, _BinaryPredicate>
-make_default_searcher( _ForwardIterator __f, _ForwardIterator __l, _BinaryPredicate __p = _BinaryPredicate ())
-{
-    return default_searcher<_ForwardIterator, _BinaryPredicate>(__f, __l, __p);
-}
-
-template<class _Key, class _Value, class _Hash, class _BinaryPredicate, bool /*useArray*/> class _BMSkipTable;
-
-//  General case for BM data searching; use a map
-template<class _Key, typename _Value, class _Hash, class _BinaryPredicate>
-class _BMSkipTable<_Key, _Value, _Hash, _BinaryPredicate, false> {
-    typedef _Value value_type;
-    typedef _Key   key_type;
-
-    const _Value __default_value_;
-    std::unordered_map<_Key, _Value, _Hash, _BinaryPredicate> __table_;
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    _BMSkipTable(size_t __sz, _Value __default, _Hash __hf, _BinaryPredicate __pred)
-        : __default_value_(__default), __table_(__sz, __hf, __pred) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    void insert(const key_type &__key, value_type __val)
-    {
-        __table_ [__key] = __val;    // Would skip_.insert (val) be better here?
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type operator [](const key_type & __key) const
-    {
-        auto __it = __table_.find (__key);
-        return __it == __table_.end() ? __default_value_ : __it->second;
-    }
-};
-
-
-//  Special case small numeric values; use an array
-template<class _Key, typename _Value, class _Hash, class _BinaryPredicate>
-class _BMSkipTable<_Key, _Value, _Hash, _BinaryPredicate, true> {
-private:
-    typedef _Value value_type;
-    typedef _Key   key_type;
-
-    typedef __make_unsigned_t<key_type> unsigned_key_type;
-    typedef std::array<value_type, 256> skip_map;
-    skip_map __table_;
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    _BMSkipTable(size_t /*__sz*/, _Value __default, _Hash /*__hf*/, _BinaryPredicate /*__pred*/)
-    {
-        std::fill_n(__table_.begin(), __table_.size(), __default);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void insert(key_type __key, value_type __val)
-    {
-        __table_[static_cast<unsigned_key_type>(__key)] = __val;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type operator [](key_type __key) const
-    {
-        return __table_[static_cast<unsigned_key_type>(__key)];
-    }
-};
-
-
-template <class _RandomAccessIterator1,
-          class _Hash = hash<typename iterator_traits<_RandomAccessIterator1>::value_type>,
-          class _BinaryPredicate = equal_to<>>
-class _LIBCPP_DEPRECATED_BOYER_MOORE_SEARCHER _LIBCPP_TEMPLATE_VIS boyer_moore_searcher {
-private:
-    typedef typename std::iterator_traits<_RandomAccessIterator1>::difference_type difference_type;
-    typedef typename std::iterator_traits<_RandomAccessIterator1>::value_type      value_type;
-    typedef _BMSkipTable<value_type, difference_type, _Hash, _BinaryPredicate,
-                    is_integral<value_type>::value && // what about enums?
-                    sizeof(value_type) == 1 &&
-                    is_same<_Hash, hash<value_type>>::value &&
-                    is_same<_BinaryPredicate, equal_to<>>::value
-            > skip_table_type;
-
-public:
-    boyer_moore_searcher(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
-                _Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate())
-            : __first_(__f), __last_(__l), __pred_(__pred),
-              __pattern_length_(_VSTD::distance(__first_, __last_)),
-              __skip_{std::make_shared<skip_table_type>(__pattern_length_, -1, __hf, __pred_)},
-              __suffix_{std::make_shared<vector<difference_type>>(__pattern_length_ + 1)}
-        {
-    //  build the skip table
-        for ( difference_type __i = 0; __f != __l; ++__f, (void) ++__i )
-            __skip_->insert(*__f, __i);
-
-        this->__build_suffix_table ( __first_, __last_, __pred_ );
-        }
-
-    template <typename _RandomAccessIterator2>
-    pair<_RandomAccessIterator2, _RandomAccessIterator2>
-    operator ()(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
-    {
-        static_assert(__is_same_uncvref<typename iterator_traits<_RandomAccessIterator1>::value_type,
-                                        typename iterator_traits<_RandomAccessIterator2>::value_type>::value,
-                      "Corpus and Pattern iterators must point to the same type");
-
-        if (__f      == __l )    return std::make_pair(__l, __l); // empty corpus
-        if (__first_ == __last_) return std::make_pair(__f, __f); // empty pattern
-
-    //  If the pattern is larger than the corpus, we can't find it!
-        if ( __pattern_length_ > _VSTD::distance(__f, __l))
-            return std::make_pair(__l, __l);
-
-    //  Do the search
-        return this->__search(__f, __l);
-    }
-
-private:
-    _RandomAccessIterator1               __first_;
-    _RandomAccessIterator1               __last_;
-    _BinaryPredicate                     __pred_;
-    difference_type                      __pattern_length_;
-    shared_ptr<skip_table_type>          __skip_;
-    shared_ptr<vector<difference_type>>  __suffix_;
-
-    template <typename _RandomAccessIterator2>
-    pair<_RandomAccessIterator2, _RandomAccessIterator2>
-    __search(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
-    {
-        _RandomAccessIterator2 __cur = __f;
-        const _RandomAccessIterator2 __last = __l - __pattern_length_;
-        const skip_table_type &         __skip   = *__skip_.get();
-        const vector<difference_type> & __suffix = *__suffix_.get();
-
-        while (__cur <= __last)
-        {
-
-        //  Do we match right where we are?
-            difference_type __j = __pattern_length_;
-            while (__pred_(__first_ [__j-1], __cur [__j-1])) {
-                __j--;
-            //  We matched - we're done!
-                if ( __j == 0 )
-                    return std::make_pair(__cur, __cur + __pattern_length_);
-                }
-
-        //  Since we didn't match, figure out how far to skip forward
-            difference_type __k = __skip[__cur [ __j - 1 ]];
-            difference_type __m = __j - __k - 1;
-            if (__k < __j && __m > __suffix[ __j ])
-                __cur += __m;
-            else
-                __cur += __suffix[ __j ];
-        }
-
-        return std::make_pair(__l, __l);     // We didn't find anything
-    }
-
-
-    template<typename _Iterator, typename _Container>
-    void __compute_bm_prefix ( _Iterator __f, _Iterator __l, _BinaryPredicate __pred, _Container &__prefix )
-    {
-        const size_t __count = _VSTD::distance(__f, __l);
-
-        __prefix[0] = 0;
-        size_t __k = 0;
-        for ( size_t __i = 1; __i < __count; ++__i )
-        {
-            while ( __k > 0 && !__pred ( __f[__k], __f[__i] ))
-                __k = __prefix [ __k - 1 ];
-
-            if ( __pred ( __f[__k], __f[__i] ))
-                __k++;
-            __prefix [ __i ] = __k;
-        }
-    }
-
-    void __build_suffix_table(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
-                                                    _BinaryPredicate __pred)
-    {
-        const size_t __count = _VSTD::distance(__f, __l);
-        vector<difference_type> & __suffix = *__suffix_.get();
-        if (__count > 0)
-        {
-            vector<difference_type> __scratch(__count);
-
-            __compute_bm_prefix(__f, __l, __pred, __scratch);
-            for ( size_t __i = 0; __i <= __count; __i++ )
-                __suffix[__i] = __count - __scratch[__count-1];
-
-            typedef reverse_iterator<_RandomAccessIterator1> _RevIter;
-            __compute_bm_prefix(_RevIter(__l), _RevIter(__f), __pred, __scratch);
-
-            for ( size_t __i = 0; __i < __count; __i++ )
-            {
-                const size_t     __j = __count - __scratch[__i];
-                const difference_type __k = __i     - __scratch[__i] + 1;
-
-                if (__suffix[__j] > __k)
-                    __suffix[__j] = __k;
-            }
-        }
-    }
-
-};
-
-template<class _RandomAccessIterator,
-         class _Hash = hash<typename iterator_traits<_RandomAccessIterator>::value_type>,
-         class _BinaryPredicate = equal_to<>>
-_LIBCPP_DEPRECATED_BOYER_MOORE_SEARCHER _LIBCPP_INLINE_VISIBILITY
-boyer_moore_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>
-make_boyer_moore_searcher( _RandomAccessIterator __f, _RandomAccessIterator __l,
-                    _Hash __hf = _Hash(), _BinaryPredicate __p = _BinaryPredicate ())
-{
-    return boyer_moore_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>(__f, __l, __hf, __p);
-}
-
-// boyer-moore-horspool
-template <class _RandomAccessIterator1,
-          class _Hash = hash<typename iterator_traits<_RandomAccessIterator1>::value_type>,
-          class _BinaryPredicate = equal_to<>>
-class _LIBCPP_DEPRECATED_BOYER_MOORE_HORSPOOL_SEARCHER _LIBCPP_TEMPLATE_VIS boyer_moore_horspool_searcher {
-private:
-    typedef typename std::iterator_traits<_RandomAccessIterator1>::difference_type difference_type;
-    typedef typename std::iterator_traits<_RandomAccessIterator1>::value_type      value_type;
-    typedef _BMSkipTable<value_type, difference_type, _Hash, _BinaryPredicate,
-                    is_integral<value_type>::value && // what about enums?
-                    sizeof(value_type) == 1 &&
-                    is_same<_Hash, hash<value_type>>::value &&
-                    is_same<_BinaryPredicate, equal_to<>>::value
-            > skip_table_type;
-
-public:
-    boyer_moore_horspool_searcher(_RandomAccessIterator1 __f, _RandomAccessIterator1 __l,
-                _Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate())
-            : __first_(__f), __last_(__l), __pred_(__pred),
-              __pattern_length_(_VSTD::distance(__first_, __last_)),
-              __skip_{_VSTD::make_shared<skip_table_type>(__pattern_length_, __pattern_length_, __hf, __pred_)}
-        {
-    //  build the skip table
-            if ( __f != __l )
-            {
-                __l = __l - 1;
-                for ( difference_type __i = 0; __f != __l; ++__f, (void) ++__i )
-                    __skip_->insert(*__f, __pattern_length_ - 1 - __i);
-            }
-        }
-
-    template <typename _RandomAccessIterator2>
-    pair<_RandomAccessIterator2, _RandomAccessIterator2>
-    operator ()(_RandomAccessIterator2 __f, _RandomAccessIterator2 __l) const
-    {
-        static_assert(__is_same_uncvref<typename std::iterator_traits<_RandomAccessIterator1>::value_type,
-                                        typename std::iterator_traits<_RandomAccessIterator2>::value_type>::value,
-                      "Corpus and Pattern iterators must point to the same type");
-
-        if (__f      == __l )    return std::make_pair(__l, __l); // empty corpus
-        if (__first_ == __last_) return std::make_pair(__f, __f); // empty pattern
-
-    //  If the pattern is larger than the corpus, we can't find it!
-        if ( __pattern_length_ > _VSTD::distance(__f, __l))
-            return std::make_pair(__l, __l);
-
-    //  Do the search
-        return this->__search(__f, __l);
-    }
-
-private:
-    _RandomAccessIterator1      __first_;
-    _RandomAccessIterator1      __last_;
-    _BinaryPredicate            __pred_;
-    difference_type             __pattern_length_;
-    shared_ptr<skip_table_type> __skip_;
-
-    template <typename _RandomAccessIterator2>
-    pair<_RandomAccessIterator2, _RandomAccessIterator2>
-    __search ( _RandomAccessIterator2 __f, _RandomAccessIterator2 __l ) const {
-        _RandomAccessIterator2 __cur = __f;
-        const _RandomAccessIterator2 __last = __l - __pattern_length_;
-        const skip_table_type & __skip = *__skip_.get();
-
-        while (__cur <= __last)
-        {
-        //  Do we match right where we are?
-            difference_type __j = __pattern_length_;
-            while (__pred_(__first_[__j-1], __cur[__j-1]))
-            {
-                __j--;
-            //  We matched - we're done!
-                if ( __j == 0 )
-                    return std::make_pair(__cur, __cur + __pattern_length_);
-            }
-            __cur += __skip[__cur[__pattern_length_-1]];
-        }
-
-        return std::make_pair(__l, __l);
-    }
-};
-
-template<class _RandomAccessIterator,
-         class _Hash = hash<typename iterator_traits<_RandomAccessIterator>::value_type>,
-         class _BinaryPredicate = equal_to<>>
-_LIBCPP_DEPRECATED_BOYER_MOORE_HORSPOOL_SEARCHER _LIBCPP_INLINE_VISIBILITY
-boyer_moore_horspool_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>
-make_boyer_moore_horspool_searcher( _RandomAccessIterator __f, _RandomAccessIterator __l,
-                    _Hash __hf = _Hash(), _BinaryPredicate __p = _BinaryPredicate ())
-{
-    return boyer_moore_horspool_searcher<_RandomAccessIterator, _Hash, _BinaryPredicate>(__f, __l, __hf, __p);
-}
-
-#endif // _LIBCPP_STD_VER > 11
-
-_LIBCPP_END_NAMESPACE_LFTS
-
-_LIBCPP_POP_MACROS
-
-#endif /* _LIBCPP_EXPERIMENTAL_FUNCTIONAL */
diff --git a/third_party/llvm-project/libcxx/include/experimental/iterator b/third_party/llvm-project/libcxx/include/experimental/iterator
index cf73b74..e47314a 100644
--- a/third_party/llvm-project/libcxx/include/experimental/iterator
+++ b/third_party/llvm-project/libcxx/include/experimental/iterator
@@ -65,7 +65,7 @@
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 _LIBCPP_BEGIN_NAMESPACE_LFTS
 
@@ -111,13 +111,13 @@
 
 
 template <class _CharT, class _Traits, class _Delim>
-_LIBCPP_HIDE_FROM_ABI ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits>
+_LIBCPP_HIDE_FROM_ABI ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>
 make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, _Delim && __d)
-{ return ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits>(__os, _VSTD::forward<_Delim>(__d)); }
+{ return ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>(__os, _VSTD::forward<_Delim>(__d)); }
 
 _LIBCPP_END_NAMESPACE_LFTS
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <type_traits>
diff --git a/third_party/llvm-project/libcxx/include/experimental/memory_resource b/third_party/llvm-project/libcxx/include/experimental/memory_resource
index f107f10..dcb61e3 100644
--- a/third_party/llvm-project/libcxx/include/experimental/memory_resource
+++ b/third_party/llvm-project/libcxx/include/experimental/memory_resource
@@ -66,16 +66,15 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__memory/allocator_traits.h>
+#include <__type_traits/aligned_storage.h>
 #include <__utility/move.h>
 #include <cstddef>
-#include <cstdlib>
 #include <experimental/__config>
 #include <experimental/__memory>
 #include <limits>
 #include <new>
 #include <stdexcept>
 #include <tuple>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -432,11 +431,13 @@
 #  include <atomic>
 #  include <climits>
 #  include <concepts>
+#  include <cstdlib>
 #  include <cstring>
 #  include <ctime>
 #  include <iterator>
 #  include <memory>
 #  include <ratio>
+#  include <type_traits>
 #  include <variant>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/experimental/propagate_const b/third_party/llvm-project/libcxx/include/experimental/propagate_const
index 34e917d..3efec5d 100644
--- a/third_party/llvm-project/libcxx/include/experimental/propagate_const
+++ b/third_party/llvm-project/libcxx/include/experimental/propagate_const
@@ -110,17 +110,32 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__functional/operations.h>
 #include <__fwd/hash.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_swappable.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_pointer.h>
+#include <__type_traits/remove_reference.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
+#include <cstddef>
 #include <experimental/__config>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 _LIBCPP_BEGIN_NAMESPACE_LFTS_V2
 
@@ -577,5 +592,10 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
+
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_EXPERIMENTAL_PROPAGATE_CONST
diff --git a/third_party/llvm-project/libcxx/include/experimental/type_traits b/third_party/llvm-project/libcxx/include/experimental/type_traits
index dd4c539..d1cc2e5 100644
--- a/third_party/llvm-project/libcxx/include/experimental/type_traits
+++ b/third_party/llvm-project/libcxx/include/experimental/type_traits
@@ -71,7 +71,7 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <experimental/__config>
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 #include <initializer_list>
 #include <type_traits>
@@ -150,6 +150,6 @@
 
 _LIBCPP_END_NAMESPACE_LFTS
 
-#endif /* _LIBCPP_STD_VER > 11 */
+#endif /* _LIBCPP_STD_VER >= 14 */
 
 #endif /* _LIBCPP_EXPERIMENTAL_TYPE_TRAITS */
diff --git a/third_party/llvm-project/libcxx/include/ext/hash_map b/third_party/llvm-project/libcxx/include/ext/hash_map
index 3ad4b16..f7f53bc 100644
--- a/third_party/llvm-project/libcxx/include/ext/hash_map
+++ b/third_party/llvm-project/libcxx/include/ext/hash_map
@@ -208,7 +208,6 @@
 #include <ext/__hash>
 #include <functional>
 #include <stdexcept>
-#include <type_traits>
 
 #if defined(__DEPRECATED) && __DEPRECATED
 #if defined(_LIBCPP_WARNING)
@@ -985,6 +984,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_HASH_MAP
diff --git a/third_party/llvm-project/libcxx/include/ext/hash_set b/third_party/llvm-project/libcxx/include/ext/hash_set
index dc8b786..9c67862 100644
--- a/third_party/llvm-project/libcxx/include/ext/hash_set
+++ b/third_party/llvm-project/libcxx/include/ext/hash_set
@@ -665,6 +665,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_HASH_SET
diff --git a/third_party/llvm-project/libcxx/include/filesystem b/third_party/llvm-project/libcxx/include/filesystem
index 7efa4ed..b10555d 100644
--- a/third_party/llvm-project/libcxx/include/filesystem
+++ b/third_party/llvm-project/libcxx/include/filesystem
@@ -159,6 +159,9 @@
     void swap(path& lhs, path& rhs) noexcept;
     size_t hash_value(const path& p) noexcept;
 
+    // [fs.path.hash], hash support
+    template<> struct hash<filesystem::path>;
+
     template <class Source>
       path u8path(const Source& source);
     template <class InputIterator>
@@ -464,6 +467,8 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
+#  include <system_error>
 #endif
 
 #endif // _LIBCPP_FILESYSTEM
diff --git a/third_party/llvm-project/libcxx/include/forward_list b/third_party/llvm-project/libcxx/include/forward_list
index 61dde81..ad616d1 100644
--- a/third_party/llvm-project/libcxx/include/forward_list
+++ b/third_party/llvm-project/libcxx/include/forward_list
@@ -146,23 +146,27 @@
 
 template <class T, class Allocator>
     bool operator< (const forward_list<T, Allocator>& x,
-                    const forward_list<T, Allocator>& y);
+                    const forward_list<T, Allocator>& y); // removed in C++20
 
 template <class T, class Allocator>
     bool operator!=(const forward_list<T, Allocator>& x,
-                    const forward_list<T, Allocator>& y);
+                    const forward_list<T, Allocator>& y); // removed in C++20
 
 template <class T, class Allocator>
     bool operator> (const forward_list<T, Allocator>& x,
-                    const forward_list<T, Allocator>& y);
+                    const forward_list<T, Allocator>& y); // removed in C++20
 
 template <class T, class Allocator>
     bool operator>=(const forward_list<T, Allocator>& x,
-                    const forward_list<T, Allocator>& y);
+                    const forward_list<T, Allocator>& y); // removed in C++20
 
 template <class T, class Allocator>
     bool operator<=(const forward_list<T, Allocator>& x,
-                    const forward_list<T, Allocator>& y);
+                    const forward_list<T, Allocator>& y); // removed in C++20
+
+template<class T, class Allocator>
+    synth-three-way-result<T> operator<=>(const forward_list<T, Allocator>& x,
+                                          const forward_list<T, Allocator>& y); // since C++20
 
 template <class T, class Allocator>
     void swap(forward_list<T, Allocator>& x, forward_list<T, Allocator>& y)
@@ -181,6 +185,7 @@
 
 #include <__algorithm/comp.h>
 #include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/lexicographical_compare_three_way.h>
 #include <__algorithm/min.h>
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
@@ -197,11 +202,18 @@
 #include <__memory/swap_allocator.h>
 #include <__memory/unique_ptr.h>
 #include <__memory_resource/polymorphic_allocator.h>
+#include <__type_traits/conditional.h>
 #include <__type_traits/is_allocator.h>
+#include <__type_traits/is_const.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_nothrow_move_assignable.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <limits>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -482,14 +494,6 @@
     typedef typename allocator_traits<__begin_node_allocator>::pointer
                                                       __begin_node_pointer;
 
-    static_assert((!is_same<allocator_type, __node_allocator>::value),
-                  "internal allocator type must differ from user-specified "
-                  "type; otherwise overload resolution breaks");
-
-    static_assert(is_same<allocator_type, __rebind_alloc<__node_traits, value_type> >::value,
-                  "[allocator.requirements] states that rebinding an allocator to the same type should result in the "
-                  "original allocator");
-
     __compressed_pair<__begin_node, __node_allocator> __before_begin_;
 
     _LIBCPP_INLINE_VISIBILITY
@@ -659,9 +663,17 @@
     typedef _Tp    value_type;
     typedef _Alloc allocator_type;
 
-    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
+    static_assert(is_same<value_type, typename allocator_type::value_type>::value,
                   "Allocator::value_type must be same type as value_type");
 
+    static_assert(is_same<allocator_type, __rebind_alloc<allocator_traits<allocator_type>, value_type> >::value,
+                  "[allocator.requirements] states that rebinding an allocator to the same type should result in the "
+                  "original allocator");
+
+    static_assert((!is_same<allocator_type, __node_allocator>::value),
+                  "internal allocator type must differ from user-specified "
+                  "type; otherwise overload resolution breaks");
+
     typedef value_type&                                                 reference;
     typedef const value_type&                                           const_reference;
     typedef typename allocator_traits<allocator_type>::pointer          pointer;
@@ -671,7 +683,7 @@
 
     typedef typename base::iterator       iterator;
     typedef typename base::const_iterator const_iterator;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef size_type                                __remove_return_type;
 #else
     typedef void                                     __remove_return_type;
@@ -684,7 +696,7 @@
     _LIBCPP_INLINE_VISIBILITY
     explicit forward_list(const allocator_type& __a);
     explicit forward_list(size_type __n);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     explicit forward_list(size_type __n, const allocator_type& __a);
 #endif
     forward_list(size_type __n, const value_type& __v);
@@ -787,7 +799,7 @@
     const_reference front() const {return base::__before_begin()->__next_->__value_;}
 
 #ifndef _LIBCPP_CXX03_LANG
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     template <class... _Args> reference emplace_front(_Args&&... __args);
 #else
     template <class... _Args> void      emplace_front(_Args&&... __args);
@@ -927,7 +939,7 @@
     }
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp, class _Alloc>
 forward_list<_Tp, _Alloc>::forward_list(size_type __n,
                                         const allocator_type& __base_alloc)
@@ -1119,7 +1131,7 @@
 
 template <class _Tp, class _Alloc>
 template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename forward_list<_Tp, _Alloc>::reference
 #else
 void
@@ -1133,7 +1145,7 @@
                                   _VSTD::forward<_Args>(__args)...);
     __h->__next_ = base::__before_begin()->__next_;
     base::__before_begin()->__next_ = __h.release();
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return base::__before_begin()->__next_->__value_;
 #endif
 }
@@ -1237,17 +1249,17 @@
         __node_traits::construct(__a, _VSTD::addressof(__h->__value_), __v);
         __node_pointer __first = __h.release();
         __node_pointer __last = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (--__n; __n != 0; --__n, __last = __last->__next_)
             {
                 __h.reset(__node_traits::allocate(__a, 1));
                 __node_traits::construct(__a, _VSTD::addressof(__h->__value_), __v);
                 __last->__next_ = __h.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1260,7 +1272,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __last->__next_ = __r->__next_;
         __r->__next_ = __first;
         __r = static_cast<__begin_node_pointer>(__last);
@@ -1283,17 +1295,17 @@
         __node_traits::construct(__a, _VSTD::addressof(__h->__value_), *__f);
         __node_pointer __first = __h.release();
         __node_pointer __last = __first;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (++__f; __f != __l; ++__f, ((void)(__last = __last->__next_)))
             {
                 __h.reset(__node_traits::allocate(__a, 1));
                 __node_traits::construct(__a, _VSTD::addressof(__h->__value_), *__f);
                 __last->__next_ = __h.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1306,7 +1318,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __last->__next_ = __r->__next_;
         __r->__next_ = __first;
         __r = static_cast<__begin_node_pointer>(__last);
@@ -1711,6 +1723,8 @@
     return (__ix == __ex) == (__iy == __ey);
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const forward_list<_Tp, _Alloc>& __x,
@@ -1752,6 +1766,20 @@
     return !(__y < __x);
 }
 
+#else // #if _LIBCPP_STD_VER <= 17
+
+template<class _Tp, class _Allocator>
+inline _LIBCPP_HIDE_FROM_ABI
+__synth_three_way_result<_Tp>
+operator<=>(const forward_list<_Tp, _Allocator>& __x,
+            const forward_list<_Tp, _Allocator>& __y)
+{
+    return std::lexicographical_compare_three_way(
+        __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way<_Tp, _Tp>);
+}
+
+#endif // #if _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 void
@@ -1761,7 +1789,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
     typename forward_list<_Tp, _Allocator>::size_type
@@ -1779,7 +1807,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _ValueT>
@@ -1794,9 +1822,11 @@
 #  include <algorithm>
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iosfwd>
 #  include <iterator>
+#  include <type_traits>
 #  include <typeinfo>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/fstream b/third_party/llvm-project/libcxx/include/fstream
index 41e95bf..09deccf 100644
--- a/third_party/llvm-project/libcxx/include/fstream
+++ b/third_party/llvm-project/libcxx/include/fstream
@@ -188,8 +188,6 @@
 #include <__utility/swap.h>
 #include <__utility/unreachable.h>
 #include <cstdio>
-#include <cstdlib>
-#include <cstring>
 #include <istream>
 #include <ostream>
 #include <typeinfo>
@@ -398,17 +396,17 @@
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>::~basic_filebuf()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         close();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     if (__owns_eb_)
         delete [] __extbuf_;
     if (__owns_ib_)
@@ -1753,6 +1751,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iosfwd>
 #  include <limits>
 #  include <new>
diff --git a/third_party/llvm-project/libcxx/include/functional b/third_party/llvm-project/libcxx/include/functional
index 8589d3a..05d42fc 100644
--- a/third_party/llvm-project/libcxx/include/functional
+++ b/third_party/llvm-project/libcxx/include/functional
@@ -43,20 +43,22 @@
 
     // construct/copy/destroy
     template<class U>
-      reference_wrapper(U&&);
-    reference_wrapper(const reference_wrapper<T>& x) noexcept;
+      constexpr reference_wrapper(U&&);                                   // constexpr since C++20
+    constexpr reference_wrapper(const reference_wrapper<T>& x) noexcept;  // constexpr since C++20
 
     // assignment
-    reference_wrapper& operator=(const reference_wrapper<T>& x) noexcept;
+    constexpr reference_wrapper&
+    operator=(const reference_wrapper<T>& x) noexcept;                    // constexpr since C++20
 
     // access
-    operator T& () const noexcept;
-    T& get() const noexcept;
+    constexpr operator T& () const noexcept;                              // constexpr since C++20
+    constexpr T& get() const noexcept;                                    // constexpr since C++20
 
     // invoke
     template <class... ArgTypes>
-      typename result_of<T&(ArgTypes&&...)>::type
-          operator() (ArgTypes&&...) const;
+      constexpr typename result_of<T&(ArgTypes&&...)>::type               // constexpr since C++20
+          operator() (ArgTypes&&...) const
+              noexcept(is_nothrow_invocable_v<T&, ArgTypes...>);          // noexcept since C++17
 };
 
 template <class T>
@@ -220,11 +222,16 @@
 template<class R, class Fn, class... BoundArgs>
   constexpr unspecified bind(Fn&&, BoundArgs&&...);  // constexpr in C++20
 
+// [func.invoke]
 template<class F, class... Args>
  constexpr // constexpr in C++20
  invoke_result_t<F, Args...> invoke(F&& f, Args&&... args) // C++17
     noexcept(is_nothrow_invocable_v<F, Args...>);
 
+template<class R, class F, class... Args>
+  constexpr R invoke_r(F&& f, Args&&... args)              // C++23
+    noexcept(is_nothrow_invocable_r_v<R, F, Args...>);
+
 namespace placeholders {
   // M is the implementation-defined number of placeholders
   extern unspecified _1;
@@ -250,10 +257,10 @@
 };
 
 template <class Operation, class T>
-binder1st<Operation> bind1st(const Operation& op, const T& x);  // deprecated in C++11, removed in C++17
+binder1st<Operation> bind1st(const Operation& op, const T& x);                  // deprecated in C++11, removed in C++17
 
 template <class Operation>
-class binder2nd     // deprecated in C++11, removed in C++17
+class binder2nd                                                                 // deprecated in C++11, removed in C++17
     : public unary_function<typename Operation::first_argument_type,
                             typename Operation::result_type>
 {
@@ -267,9 +274,9 @@
 };
 
 template <class Operation, class T>
-binder2nd<Operation> bind2nd(const Operation& op, const T& x);  // deprecated in C++11, removed in C++17
+binder2nd<Operation> bind2nd(const Operation& op, const T& x);                  // deprecated in C++11, removed in C++17
 
-template <class Arg, class Result>      // deprecated in C++11, removed in C++17
+template <class Arg, class Result>                                              // deprecated in C++11, removed in C++17
 class pointer_to_unary_function : public unary_function<Arg, Result>
 {
 public:
@@ -278,9 +285,9 @@
 };
 
 template <class Arg, class Result>
-pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg));      // deprecated in C++11, removed in C++17
+pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg));                // deprecated in C++11, removed in C++17
 
-template <class Arg1, class Arg2, class Result>      // deprecated in C++11, removed in C++17
+template <class Arg1, class Arg2, class Result>                                 // deprecated in C++11, removed in C++17
 class pointer_to_binary_function : public binary_function<Arg1, Arg2, Result>
 {
 public:
@@ -289,9 +296,9 @@
 };
 
 template <class Arg1, class Arg2, class Result>
-pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1,Arg2));      // deprecated in C++11, removed in C++17
+pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1,Arg2));   // deprecated in C++11, removed in C++17
 
-template<class S, class T>      // deprecated in C++11, removed in C++17
+template<class S, class T>                                                      // deprecated in C++11, removed in C++17
 class mem_fun_t : public unary_function<T*, S>
 {
 public:
@@ -300,18 +307,18 @@
 };
 
 template<class S, class T, class A>
-class mem_fun1_t : public binary_function<T*, A, S>      // deprecated in C++11, removed in C++17
+class mem_fun1_t : public binary_function<T*, A, S>                             // deprecated in C++11, removed in C++17
 {
 public:
     explicit mem_fun1_t(S (T::*p)(A));
     S operator()(T* p, A x) const;
 };
 
-template<class S, class T>          mem_fun_t<S,T>    mem_fun(S (T::*f)());      // deprecated in C++11, removed in C++17
-template<class S, class T, class A> mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A));     // deprecated in C++11, removed in C++17
+template<class S, class T>          mem_fun_t<S,T>    mem_fun(S (T::*f)());     // deprecated in C++11, removed in C++17
+template<class S, class T, class A> mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A));    // deprecated in C++11, removed in C++17
 
 template<class S, class T>
-class mem_fun_ref_t : public unary_function<T, S>      // deprecated in C++11, removed in C++17
+class mem_fun_ref_t : public unary_function<T, S>                               // deprecated in C++11, removed in C++17
 {
 public:
     explicit mem_fun_ref_t(S (T::*p)());
@@ -319,18 +326,20 @@
 };
 
 template<class S, class T, class A>
-class mem_fun1_ref_t : public binary_function<T, A, S>      // deprecated in C++11, removed in C++17
+class mem_fun1_ref_t : public binary_function<T, A, S>                          // deprecated in C++11, removed in C++17
 {
 public:
     explicit mem_fun1_ref_t(S (T::*p)(A));
     S operator()(T& p, A x) const;
 };
 
-template<class S, class T>          mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)());      // deprecated in C++11, removed in C++17
-template<class S, class T, class A> mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A));     // deprecated in C++11, removed in C++17
+template<class S, class T>
+mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)());                                 // deprecated in C++11, removed in C++17
+template<class S, class T, class A>
+mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A));                                // deprecated in C++11, removed in C++17
 
 template <class S, class T>
-class const_mem_fun_t : public unary_function<const T*, S>      // deprecated in C++11, removed in C++17
+class const_mem_fun_t : public unary_function<const T*, S>                      // deprecated in C++11, removed in C++17
 {
 public:
     explicit const_mem_fun_t(S (T::*p)() const);
@@ -338,18 +347,20 @@
 };
 
 template <class S, class T, class A>
-class const_mem_fun1_t : public binary_function<const T*, A, S>      // deprecated in C++11, removed in C++17
+class const_mem_fun1_t : public binary_function<const T*, A, S>                 // deprecated in C++11, removed in C++17
 {
 public:
     explicit const_mem_fun1_t(S (T::*p)(A) const);
     S operator()(const T* p, A x) const;
 };
 
-template <class S, class T>          const_mem_fun_t<S,T>    mem_fun(S (T::*f)() const);      // deprecated in C++11, removed in C++17
-template <class S, class T, class A> const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const);     // deprecated in C++11, removed in C++17
+template <class S, class T>
+const_mem_fun_t<S,T>    mem_fun(S (T::*f)() const);                             // deprecated in C++11, removed in C++17
+template <class S, class T, class A>
+const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const);                            // deprecated in C++11, removed in C++17
 
 template <class S, class T>
-class const_mem_fun_ref_t : public unary_function<T, S>      // deprecated in C++11, removed in C++17
+class const_mem_fun_ref_t : public unary_function<T, S>                         // deprecated in C++11, removed in C++17
 {
 public:
     explicit const_mem_fun_ref_t(S (T::*p)() const);
@@ -357,18 +368,19 @@
 };
 
 template <class S, class T, class A>
-class const_mem_fun1_ref_t : public binary_function<T, A, S>      // deprecated in C++11, removed in C++17
+class const_mem_fun1_ref_t : public binary_function<T, A, S>                    // deprecated in C++11, removed in C++17
 {
 public:
     explicit const_mem_fun1_ref_t(S (T::*p)(A) const);
     S operator()(const T& p, A x) const;
 };
 
-template <class S, class T>          const_mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)() const);   // deprecated in C++11, removed in C++17
-template <class S, class T, class A> const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const);  // deprecated in C++11, removed in C++17
+template <class S, class T>
+const_mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)() const);                     // deprecated in C++11, removed in C++17
+template <class S, class T, class A>
+const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const);                    // deprecated in C++11, removed in C++17
 
-template<class R, class T>
-constexpr unspecified mem_fn(R T::*); // constexpr in C++20
+template<class R, class T> constexpr unspecified mem_fn(R T::*);                // constexpr in C++20
 
 class bad_function_call
     : public exception
@@ -505,7 +517,7 @@
 #include <__compare/compare_three_way.h>
 #include <__config>
 #include <__debug>
-#include <__functional/binary_function.h> // TODO: deprecate
+#include <__functional/binary_function.h>
 #include <__functional/binary_negate.h>
 #include <__functional/bind.h>
 #include <__functional/bind_back.h>
@@ -527,13 +539,11 @@
 #include <__functional/pointer_to_unary_function.h>
 #include <__functional/ranges_operations.h>
 #include <__functional/reference_wrapper.h>
-#include <__functional/unary_function.h> // TODO: deprecate
+#include <__functional/unary_function.h>
 #include <__functional/unary_negate.h>
 #include <__functional/unwrap_ref.h>
 #include <__utility/forward.h>
-#include <exception>
 #include <memory> // TODO: find out why removing this breaks the modules build
-#include <type_traits>
 #include <typeinfo>
 #include <version>
 
@@ -542,8 +552,12 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
+#  include <exception>
 #  include <tuple>
+#  include <type_traits>
 #  include <utility>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/future b/third_party/llvm-project/libcxx/include/future
index 2f14a47..22fc585 100644
--- a/third_party/llvm-project/libcxx/include/future
+++ b/third_party/llvm-project/libcxx/include/future
@@ -366,17 +366,28 @@
 #include <__chrono/duration.h>
 #include <__chrono/time_point.h>
 #include <__config>
+#include <__exception/exception_ptr.h>
+#include <__memory/allocator.h>
 #include <__memory/allocator_arg_t.h>
 #include <__memory/allocator_destructor.h>
+#include <__memory/allocator_traits.h>
+#include <__memory/compressed_pair.h>
+#include <__memory/pointer_traits.h>
+#include <__memory/shared_ptr.h>
+#include <__memory/unique_ptr.h>
 #include <__memory/uses_allocator.h>
+#include <__system_error/error_category.h>
+#include <__system_error/error_code.h>
+#include <__system_error/error_condition.h>
+#include <__type_traits/aligned_storage.h>
+#include <__type_traits/alignment_of.h>
 #include <__type_traits/strip_signature.h>
 #include <__utility/auto_cast.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <exception>
 #include <mutex>
 #include <new>
-#include <system_error>
+#include <stdexcept>
 #include <thread>
 #include <version>
 
@@ -520,16 +531,16 @@
 };
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
 _LIBCPP_AVAILABILITY_FUTURE_ERROR
 #endif
 void __throw_future_error(future_errc __ev)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw future_error(make_error_code(__ev));
 #else
-    ((void)__ev);
-    _VSTD::abort();
+    (void)__ev;
+    _LIBCPP_VERBOSE_ABORT("future_error was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -869,18 +880,18 @@
 void
 __deferred_assoc_state<_Rp, _Fp>::__execute()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->set_value(__func_());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Fp>
@@ -910,19 +921,19 @@
 void
 __deferred_assoc_state<void, _Fp>::__execute()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __func_();
         this->set_value();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Rp, class _Fp>
@@ -952,18 +963,18 @@
 void
 __async_assoc_state<_Rp, _Fp>::__execute()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->set_value(__func_());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Rp, class _Fp>
@@ -1001,19 +1012,19 @@
 void
 __async_assoc_state<void, _Fp>::__execute()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __func_();
         this->set_value();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Fp>
@@ -1120,7 +1131,7 @@
 _Rp
 future<_Rp>::get()
 {
-    unique_ptr<__shared_count, __release_shared_count> __(__state_);
+    unique_ptr<__shared_count, __release_shared_count> __guard(__state_);
     __assoc_state<_Rp>* __s = __state_;
     __state_ = nullptr;
     return __s->move();
@@ -1202,7 +1213,7 @@
 _Rp&
 future<_Rp&>::get()
 {
-    unique_ptr<__shared_count, __release_shared_count> __(__state_);
+    unique_ptr<__shared_count, __release_shared_count> __guard(__state_);
     __assoc_state<_Rp&>* __s = __state_;
     __state_ = nullptr;
     return __s->copy();
@@ -1756,7 +1767,7 @@
 __packaged_task_function<_Rp(_ArgTypes...)>::__packaged_task_function(_Fp&& __f)
     : __f_(nullptr)
 {
-    typedef __libcpp_remove_reference_t<typename decay<_Fp>::type> _FR;
+    typedef __libcpp_remove_reference_t<__decay_t<_Fp> > _FR;
     typedef __packaged_task_func<_FR, allocator<_FR>, _Rp(_ArgTypes...)> _FF;
     if (sizeof(_FF) <= sizeof(__buf_))
     {
@@ -1780,7 +1791,7 @@
                                   allocator_arg_t, const _Alloc& __a0, _Fp&& __f)
     : __f_(nullptr)
 {
-    typedef __libcpp_remove_reference_t<typename decay<_Fp>::type> _FR;
+    typedef __libcpp_remove_reference_t<__decay_t<_Fp> > _FR;
     typedef __packaged_task_func<_FR, _Alloc, _Rp(_ArgTypes...)> _FF;
     if (sizeof(_FF) <= sizeof(__buf_))
     {
@@ -1902,8 +1913,8 @@
               class = __enable_if_t<!is_same<__remove_cvref_t<_Fp>, packaged_task>::value> >
         _LIBCPP_INLINE_VISIBILITY
         packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
-             : __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
-               __p_(allocator_arg, __a) {}
+             : __f_(allocator_arg_t(), __a, _VSTD::forward<_Fp>(__f)),
+               __p_(allocator_arg_t(), __a) {}
     // ~packaged_task() = default;
 
     // no copy
@@ -1950,18 +1961,18 @@
         __throw_future_error(future_errc::no_state);
     if (__p_.__state_->__has_value())
         __throw_future_error(future_errc::promise_already_satisfied);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __p_.set_value(__f_(_VSTD::forward<_ArgTypes>(__args)...));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __p_.set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template<class _Rp, class ..._ArgTypes>
@@ -1972,18 +1983,18 @@
         __throw_future_error(future_errc::no_state);
     if (__p_.__state_->__has_value())
         __throw_future_error(future_errc::promise_already_satisfied);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __p_.set_value_at_thread_exit(__f_(_VSTD::forward<_ArgTypes>(__args)...));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __p_.set_exception_at_thread_exit(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template<class _Rp, class ..._ArgTypes>
@@ -2017,8 +2028,8 @@
               class = __enable_if_t<!is_same<__remove_cvref_t<_Fp>, packaged_task>::value> >
         _LIBCPP_INLINE_VISIBILITY
         packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
-             : __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
-               __p_(allocator_arg, __a) {}
+             : __f_(allocator_arg_t(), __a, _VSTD::forward<_Fp>(__f)),
+               __p_(allocator_arg_t(), __a) {}
     // ~packaged_task() = default;
 
     // no copy
@@ -2075,19 +2086,19 @@
         __throw_future_error(future_errc::no_state);
     if (__p_.__state_->__has_value())
         __throw_future_error(future_errc::promise_already_satisfied);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __f_(_VSTD::forward<_ArgTypes>(__args)...);
         __p_.set_value();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __p_.set_exception(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template<class ..._ArgTypes>
@@ -2098,19 +2109,19 @@
         __throw_future_error(future_errc::no_state);
     if (__p_.__state_->__has_value())
         __throw_future_error(future_errc::promise_already_satisfied);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __f_(_VSTD::forward<_ArgTypes>(__args)...);
         __p_.set_value_at_thread_exit();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __p_.set_exception_at_thread_exit(current_exception());
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template<class ..._ArgTypes>
@@ -2189,20 +2200,20 @@
 
 template <class _Fp, class... _Args>
 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI
-future<typename __invoke_of<typename decay<_Fp>::type, typename decay<_Args>::type...>::type>
+future<typename __invoke_of<__decay_t<_Fp>, __decay_t<_Args>...>::type>
 async(launch __policy, _Fp&& __f, _Args&&... __args)
 {
-    typedef __async_func<typename decay<_Fp>::type, typename decay<_Args>::type...> _BF;
+    typedef __async_func<__decay_t<_Fp>, __decay_t<_Args>...> _BF;
     typedef typename _BF::_Rp _Rp;
 
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
 #endif
         if (__does_policy_contain(__policy, launch::async))
         return _VSTD::__make_async_assoc_state<_Rp>(_BF(_LIBCPP_AUTO_CAST(_VSTD::forward<_Fp>(__f)),
                                                         _LIBCPP_AUTO_CAST(_VSTD::forward<_Args>(__args))...));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch ( ... ) { if (__policy == launch::async) throw ; }
 #endif
@@ -2215,7 +2226,7 @@
 
 template <class _Fp, class... _Args>
 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY
-future<typename __invoke_of<typename decay<_Fp>::type, typename decay<_Args>::type...>::type>
+future<typename __invoke_of<__decay_t<_Fp>, __decay_t<_Args>...>::type>
 async(_Fp&& __f, _Args&&... __args)
 {
     return _VSTD::async(launch::any, _VSTD::forward<_Fp>(__f),
@@ -2454,4 +2465,11 @@
 #  include <chrono>
 #endif
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
+#  include <cstdlib>
+#  include <exception>
+#  include <system_error>
+#endif
+
 #endif // _LIBCPP_FUTURE
diff --git a/third_party/llvm-project/libcxx/include/iomanip b/third_party/llvm-project/libcxx/include/iomanip
index 38c5c9b..53445c7 100644
--- a/third_party/llvm-project/libcxx/include/iomanip
+++ b/third_party/llvm-project/libcxx/include/iomanip
@@ -301,10 +301,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
 operator>>(basic_istream<_CharT, _Traits>& __is, const __iom_t7<_MoneyT>& __x)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_istream<_CharT, _Traits>::sentry __s(__is);
         if (__s)
         {
@@ -315,13 +315,13 @@
             __mf.get(_Ip(__is), _Ip(), __x.__intl_, __is, __err, __x.__mon_);
             __is.setstate(__err);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __is.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __is;
 }
 
@@ -361,10 +361,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const __iom_t8<_MoneyT>& __x)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_ostream<_CharT, _Traits>::sentry __s(__os);
         if (__s)
         {
@@ -374,13 +374,13 @@
             if (__mf.put(_Op(__os), __x.__intl_, __os, __os.fill(), __x.__mon_).failed())
                 __os.setstate(ios_base::badbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __os.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __os;
 }
 
@@ -420,10 +420,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
 operator>>(basic_istream<_CharT, _Traits>& __is, const __iom_t9<_CharT>& __x)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_istream<_CharT, _Traits>::sentry __s(__is);
         if (__s)
         {
@@ -435,13 +435,13 @@
                      __x.__fmt_, __x.__fmt_ + _Traits::length(__x.__fmt_));
             __is.setstate(__err);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __is.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __is;
 }
 
@@ -481,10 +481,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const __iom_t10<_CharT>& __x)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_ostream<_CharT, _Traits>::sentry __s(__os);
         if (__s)
         {
@@ -495,13 +495,13 @@
                          __x.__fmt_, __x.__fmt_ + _Traits::length(__x.__fmt_)).failed())
                 __os.setstate(ios_base::badbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __os.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __os;
 }
 
@@ -513,8 +513,6 @@
     return __iom_t10<_CharT>(__tm, __fmt);
 }
 
-#if _LIBCPP_STD_VER >= 11
-
 template <class _CharT, class _Traits>
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 __quoted_output(basic_ostream<_CharT, _Traits>& __os,
@@ -622,9 +620,7 @@
     return __quoted_proxy<_CharT, _Traits, _Allocator>(__s, __delim, __escape);
 }
 
-#endif // _LIBCPP_STD_VER >= 11
-
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 template <class _CharT>
 _LIBCPP_HIDE_FROM_ABI
@@ -656,7 +652,7 @@
     return __quoted_output_proxy<_CharT, _Traits>(__sv.data(), __sv.data() + __sv.size(), __delim, __escape);
 }
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/ios b/third_party/llvm-project/libcxx/include/ios
index 9eecf4d..d972a22 100644
--- a/third_party/llvm-project/libcxx/include/ios
+++ b/third_party/llvm-project/libcxx/include/ios
@@ -219,8 +219,12 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__ios/fpos.h>
 #include <__locale>
+#include <__system_error/error_category.h>
+#include <__system_error/error_code.h>
+#include <__system_error/error_condition.h>
+#include <__system_error/system_error.h>
 #include <__utility/swap.h>
-#include <system_error>
+#include <__verbose_abort>
 #include <version>
 
 // standard-mandated includes
@@ -229,7 +233,7 @@
 #include <iosfwd>
 
 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
-#include <atomic>     // for __xindex_
+#  include <__atomic/atomic.h> // for __xindex_
 #endif
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -448,11 +452,10 @@
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_failure(char const* __msg) {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw ios_base::failure(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("ios_base::failure was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
@@ -1039,6 +1042,7 @@
 _LIBCPP_END_NAMESPACE_STD
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
 #  include <cstddef>
 #  include <cstdlib>
@@ -1047,6 +1051,7 @@
 #  include <limits>
 #  include <new>
 #  include <stdexcept>
+#  include <system_error>
 #  include <type_traits>
 #  include <typeinfo>
 #endif
diff --git a/third_party/llvm-project/libcxx/include/istream b/third_party/llvm-project/libcxx/include/istream
index 6e67d61..7350e11 100644
--- a/third_party/llvm-project/libcxx/include/istream
+++ b/third_party/llvm-project/libcxx/include/istream
@@ -161,6 +161,10 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__iterator/istreambuf_iterator.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_base_of.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <ostream>
 #include <version>
@@ -360,14 +364,14 @@
     typename basic_istream<_CharT, _Traits>::sentry __s(__is);
     if (__s)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef istreambuf_iterator<_CharT, _Traits> _Ip;
             typedef num_get<_CharT, _Ip> _Fp;
             std::use_facet<_Fp>(__is.getloc()).get(_Ip(__is), _Ip(), __is, __state, __n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -469,10 +473,10 @@
     typename basic_istream<_CharT, _Traits>::sentry __s(__is);
     if (__s)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef istreambuf_iterator<_CharT, _Traits> _Ip;
             typedef num_get<_CharT, _Ip> _Fp;
             long __temp;
@@ -491,7 +495,7 @@
             {
                 __n = static_cast<_Tp>(__temp);
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -502,7 +506,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __is.setstate(__state);
     }
     return __is;
@@ -531,7 +535,7 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -555,7 +559,7 @@
             __is.width(0);
             if (__s == __p)
                __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -572,7 +576,7 @@
     return __is;
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template<class _CharT, class _Traits, size_t _Np>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -630,7 +634,7 @@
     return __is >> (char*)__s;
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template<class _CharT, class _Traits>
 _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
@@ -640,7 +644,7 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -649,7 +653,7 @@
                 __state |= ios_base::eofbit | ios_base::failbit;
             else
                 __c = _Traits::to_char_type(__i);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -693,10 +697,10 @@
     {
         if (__sb)
         {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             try
             {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
                 while (true)
                 {
                     typename traits_type::int_type __i = this->rdbuf()->sgetc();
@@ -714,7 +718,7 @@
                 }
                 if (__gc_ == 0)
                    __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             }
             catch (...)
             {
@@ -728,7 +732,7 @@
                     throw;
                 }
             }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         }
         else
         {
@@ -749,7 +753,7 @@
     sentry __s(*this, true);
     if (__s)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -758,7 +762,7 @@
                __state |= ios_base::failbit | ios_base::eofbit;
             else
                 __gc_ = 1;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -785,7 +789,7 @@
     {
         if (__n > 0)
         {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             try
             {
 #endif
@@ -806,7 +810,7 @@
                 }
                 if (__gc_ == 0)
                    __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             }
             catch (...)
             {
@@ -845,10 +849,10 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             while (true)
             {
                 typename traits_type::int_type __i = this->rdbuf()->sgetc();
@@ -865,14 +869,14 @@
                 ++__gc_;
                 this->rdbuf()->sbumpc();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __state |= ios_base::badbit;
             // according to the spec, exceptions here are caught but not rethrown
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         if (__gc_ == 0)
            __state |= ios_base::failbit;
         this->setstate(__state);
@@ -889,10 +893,10 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             while (true)
             {
                 typename traits_type::int_type __i = this->rdbuf()->sgetc();
@@ -917,7 +921,7 @@
                 this->rdbuf()->sbumpc();
                 ++__gc_;
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -932,7 +936,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     if (__n > 0)
         *__s = char_type();
@@ -951,10 +955,10 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (__n == numeric_limits<streamsize>::max())
             {
                 while (true)
@@ -985,7 +989,7 @@
                         break;
                 }
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -996,7 +1000,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return *this;
@@ -1012,14 +1016,14 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __r = this->rdbuf()->sgetc();
             if (traits_type::eq_int_type(__r, traits_type::eof()))
                 __state |= ios_base::eofbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1030,7 +1034,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return __r;
@@ -1045,14 +1049,14 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __gc_ = this->rdbuf()->sgetn(__s, __n);
             if (__gc_ != __n)
                 __state |= ios_base::failbit | ios_base::eofbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1063,7 +1067,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     else
     {
@@ -1082,10 +1086,10 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             streamsize __c = this->rdbuf()->in_avail();
             switch (__c)
             {
@@ -1101,7 +1105,7 @@
                     __state |= ios_base::failbit | ios_base::eofbit;
                 break;
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1112,7 +1116,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     else
     {
@@ -1132,13 +1136,13 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (this->rdbuf() == nullptr || this->rdbuf()->sputbackc(__c) == traits_type::eof())
                 __state |= ios_base::badbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1149,7 +1153,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     else
     {
@@ -1169,13 +1173,13 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (this->rdbuf() == nullptr || this->rdbuf()->sungetc() == traits_type::eof())
                 __state |= ios_base::badbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1186,7 +1190,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     else
     {
@@ -1205,10 +1209,10 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (this->rdbuf() == nullptr)
                 return -1;
             if (this->rdbuf()->pubsync() == -1)
@@ -1216,7 +1220,7 @@
                 __state |= ios_base::badbit;
                 return -1;
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1227,7 +1231,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return __r;
@@ -1242,12 +1246,12 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __r = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1258,7 +1262,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return __r;
@@ -1273,13 +1277,13 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (this->rdbuf()->pubseekpos(__pos, ios_base::in) == pos_type(-1))
                 __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1290,7 +1294,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return *this;
@@ -1305,13 +1309,13 @@
     sentry __sen(*this, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (this->rdbuf()->pubseekoff(__off, __dir, ios_base::in) == pos_type(-1))
                 __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1322,7 +1326,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         this->setstate(__state);
     }
     return *this;
@@ -1336,10 +1340,10 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
             while (true)
             {
@@ -1353,7 +1357,7 @@
                     break;
                 __is.rdbuf()->sbumpc();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1364,7 +1368,7 @@
                 throw;
             }
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __is.setstate(__state);
     }
     return __is;
@@ -1450,7 +1454,7 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -1480,7 +1484,7 @@
             __is.width(0);
             if (__c == 0)
                __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1506,7 +1510,7 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -1533,7 +1537,7 @@
             }
             if (__extr == 0)
                __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1585,7 +1589,7 @@
     typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
     if (__sen)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
 #endif
@@ -1612,7 +1616,7 @@
             __x = bitset<_Size>(__str);
             if (_Size > 0 && __c == 0)
                __state |= ios_base::failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
diff --git a/third_party/llvm-project/libcxx/include/iterator b/third_party/llvm-project/libcxx/include/iterator
index 35eca67..c4bec91 100644
--- a/third_party/llvm-project/libcxx/include/iterator
+++ b/third_party/llvm-project/libcxx/include/iterator
@@ -387,7 +387,7 @@
 class move_iterator {
 public:
     using iterator_type     = Iterator;
-    using iterator_concept  = input_iterator_tag; // From C++20
+    using iterator_concept  = see below; // From C++20
     using iterator_category = see below; // not always present starting from C++20
     using value_type        = iter_value_t<Iterator>; // Until C++20, iterator_traits<Iterator>::value_type
     using difference_type   = iter_difference_t<Iterator>; // Until C++20, iterator_traits<Iterator>::difference_type;
@@ -732,6 +732,7 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
 #  include <exception>
 #  include <new>
 #  include <type_traits>
diff --git a/third_party/llvm-project/libcxx/include/latch b/third_party/llvm-project/libcxx/include/latch
index ff17f84..d72cb4f 100644
--- a/third_party/llvm-project/libcxx/include/latch
+++ b/third_party/llvm-project/libcxx/include/latch
@@ -41,9 +41,12 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__atomic/atomic_base.h>
+#include <__atomic/atomic_sync.h>
+#include <__atomic/memory_order.h>
 #include <__availability>
 #include <__config>
-#include <atomic>
+#include <cstddef>
 #include <limits>
 #include <version>
 
@@ -111,4 +114,8 @@
 
 _LIBCPP_POP_MACROS
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
+#endif
+
 #endif //_LIBCPP_LATCH
diff --git a/third_party/llvm-project/libcxx/include/libcxx.imp b/third_party/llvm-project/libcxx/include/libcxx.imp
index 575ce0f..daa9188 100644
--- a/third_party/llvm-project/libcxx/include/libcxx.imp
+++ b/third_party/llvm-project/libcxx/include/libcxx.imp
@@ -8,7 +8,6 @@
   { include: [ "<__node_handle>", "private", "<unordered_set>", "public" ] },
   { include: [ "<__split_buffer>", "private", "<deque>", "public" ] },
   { include: [ "<__split_buffer>", "private", "<vector>", "public" ] },
-  { include: [ "<__std_stream>", "private", "<iostream>", "public" ] },
   { include: [ "<__threading_support>", "private", "<atomic>", "public" ] },
   { include: [ "<__threading_support>", "private", "<mutex>", "public" ] },
   { include: [ "<__threading_support>", "private", "<semaphore>", "public" ] },
@@ -16,13 +15,16 @@
   { include: [ "<__tree>", "private", "<map>", "public" ] },
   { include: [ "<__tree>", "private", "<set>", "public" ] },
   { include: [ "@<__algorithm/.*>", "private", "<algorithm>", "public" ] },
+  { include: [ "@<__atomic/.*>", "private", "<atomic>", "public" ] },
   { include: [ "@<__bit/.*>", "private", "<bit>", "public" ] },
   { include: [ "@<__charconv/.*>", "private", "<charconv>", "public" ] },
   { include: [ "@<__chrono/.*>", "private", "<chrono>", "public" ] },
   { include: [ "@<__compare/.*>", "private", "<compare>", "public" ] },
   { include: [ "@<__concepts/.*>", "private", "<concepts>", "public" ] },
+  { include: [ "@<__condition_variable/.*>", "private", "<condition_variable>", "public" ] },
   { include: [ "@<__coroutine/.*>", "private", "<coroutine>", "public" ] },
   { include: [ "@<__debug_utils/.*>", "private", "<debug_utils>", "public" ] },
+  { include: [ "@<__exception/.*>", "private", "<exception>", "public" ] },
   { include: [ "@<__expected/.*>", "private", "<expected>", "public" ] },
   { include: [ "@<__filesystem/.*>", "private", "<filesystem>", "public" ] },
   { include: [ "@<__format/.*>", "private", "<format>", "public" ] },
@@ -32,13 +34,15 @@
   { include: [ "@<__iterator/.*>", "private", "<iterator>", "public" ] },
   { include: [ "@<__memory/.*>", "private", "<memory>", "public" ] },
   { include: [ "@<__memory_resource/.*>", "private", "<memory_resource>", "public" ] },
+  { include: [ "@<__mutex/.*>", "private", "<mutex>", "public" ] },
   { include: [ "@<__numeric/.*>", "private", "<numeric>", "public" ] },
   { include: [ "@<__random/.*>", "private", "<random>", "public" ] },
   { include: [ "@<__ranges/.*>", "private", "<ranges>", "public" ] },
   { include: [ "@<__string/.*>", "private", "<string>", "public" ] },
   { include: [ "@<__support/.*>", "private", "<support>", "public" ] },
+  { include: [ "@<__system_error/.*>", "private", "<system_error>", "public" ] },
   { include: [ "@<__thread/.*>", "private", "<thread>", "public" ] },
-  { include: [ "@<__tuple_dir/.*>", "private", "<tuple>", "public" ] },
+  { include: [ "@<__tuple/.*>", "private", "<tuple>", "public" ] },
   { include: [ "@<__type_traits/.*>", "private", "<type_traits>", "public" ] },
   { include: [ "@<__utility/.*>", "private", "<utility>", "public" ] },
   { include: [ "@<__variant/.*>", "private", "<variant>", "public" ] },
diff --git a/third_party/llvm-project/libcxx/include/list b/third_party/llvm-project/libcxx/include/list
index a0c7327..6969d3c 100644
--- a/third_party/llvm-project/libcxx/include/list
+++ b/third_party/llvm-project/libcxx/include/list
@@ -155,15 +155,18 @@
 template <class T, class Alloc>
     bool operator==(const list<T,Alloc>& x, const list<T,Alloc>& y);
 template <class T, class Alloc>
-    bool operator< (const list<T,Alloc>& x, const list<T,Alloc>& y);
+    bool operator< (const list<T,Alloc>& x, const list<T,Alloc>& y);     // removed in C++20
 template <class T, class Alloc>
-    bool operator!=(const list<T,Alloc>& x, const list<T,Alloc>& y);
+    bool operator!=(const list<T,Alloc>& x, const list<T,Alloc>& y);     // removed in C++20
 template <class T, class Alloc>
-    bool operator> (const list<T,Alloc>& x, const list<T,Alloc>& y);
+    bool operator> (const list<T,Alloc>& x, const list<T,Alloc>& y);     // removed in C++20
 template <class T, class Alloc>
-    bool operator>=(const list<T,Alloc>& x, const list<T,Alloc>& y);
+    bool operator>=(const list<T,Alloc>& x, const list<T,Alloc>& y);     // removed in C++20
 template <class T, class Alloc>
-    bool operator<=(const list<T,Alloc>& x, const list<T,Alloc>& y);
+    bool operator<=(const list<T,Alloc>& x, const list<T,Alloc>& y);     // removed in C++20
+template<class T, class Allocator>
+  synth-three-way-result<T> operator<=>(const list<T, Allocator>& x,
+                                        const list<T, Allocator>& y);    // since C++20
 
 template <class T, class Alloc>
     void swap(list<T,Alloc>& x, list<T,Alloc>& y)
@@ -171,10 +174,10 @@
 
 template <class T, class Allocator, class U>
     typename list<T, Allocator>::size_type
-    erase(list<T, Allocator>& c, const U& value);       // C++20
+    erase(list<T, Allocator>& c, const U& value);       // since C++20
 template <class T, class Allocator, class Predicate>
     typename list<T, Allocator>::size_type
-    erase_if(list<T, Allocator>& c, Predicate pred);    // C++20
+    erase_if(list<T, Allocator>& c, Predicate pred);    // since C++20
 
 }  // std
 
@@ -183,6 +186,7 @@
 #include <__algorithm/comp.h>
 #include <__algorithm/equal.h>
 #include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/lexicographical_compare_three_way.h>
 #include <__algorithm/min.h>
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
@@ -203,13 +207,19 @@
 #include <__memory/swap_allocator.h>
 #include <__memory/unique_ptr.h>
 #include <__memory_resource/polymorphic_allocator.h>
+#include <__type_traits/conditional.h>
 #include <__type_traits/is_allocator.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_nothrow_move_assignable.h>
+#include <__type_traits/is_nothrow_move_constructible.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <cstring>
 #include <limits>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -824,7 +834,7 @@
     typedef _Tp                                            value_type;
     typedef _Alloc                                         allocator_type;
     static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");
+                  "Allocator::value_type must be same type as value_type");
     typedef value_type&                                    reference;
     typedef const value_type&                              const_reference;
     typedef typename base::pointer                         pointer;
@@ -835,7 +845,7 @@
     typedef typename base::const_iterator                  const_iterator;
     typedef _VSTD::reverse_iterator<iterator>              reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator>        const_reverse_iterator;
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     typedef size_type                                      __remove_return_type;
 #else
     typedef void                                           __remove_return_type;
@@ -857,7 +867,7 @@
         _VSTD::__debug_db_insert_c(this);
     }
     explicit list(size_type __n);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     explicit list(size_type __n, const allocator_type& __a);
 #endif
     list(size_type __n, const value_type& __x);
@@ -986,13 +996,13 @@
     void push_back(value_type&& __x);
 
     template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
        reference emplace_front(_Args&&... __args);
 #else
        void      emplace_front(_Args&&... __args);
 #endif
     template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         reference emplace_back(_Args&&... __args);
 #else
        void       emplace_back(_Args&&... __args);
@@ -1200,7 +1210,7 @@
 #endif
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp, class _Alloc>
 list<_Tp, _Alloc>::list(size_type __n, const allocator_type& __a) : base(__a)
 {
@@ -1423,10 +1433,10 @@
         __r = iterator(__hold->__as_link(), this);
         __hold.release();
         iterator __e = __r;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (--__n; __n != 0; --__n, (void) ++__e, ++__ds)
             {
                 __hold.reset(__node_alloc_traits::allocate(__na, 1));
@@ -1435,7 +1445,7 @@
                 __hold->__prev_ = __e.__ptr_;
                 __hold.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1450,7 +1460,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
         base::__sz() += __ds;
     }
@@ -1476,10 +1486,10 @@
         __r = iterator(__hold.get()->__as_link(), this);
         __hold.release();
         iterator __e = __r;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (++__f; __f != __l; ++__f, (void) ++__e, ++__ds)
             {
                 __hold.reset(__node_alloc_traits::allocate(__na, 1));
@@ -1488,7 +1498,7 @@
                 __hold->__prev_ = __e.__ptr_;
                 __hold.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1503,7 +1513,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
         base::__sz() += __ds;
     }
@@ -1563,7 +1573,7 @@
 
 template <class _Tp, class _Alloc>
 template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename list<_Tp, _Alloc>::reference
 #else
 void
@@ -1575,7 +1585,7 @@
     __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
     __link_nodes_at_front(__hold.get()->__as_link(), __hold.get()->__as_link());
     ++base::__sz();
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return __hold.release()->__value_;
 #else
     __hold.release();
@@ -1584,7 +1594,7 @@
 
 template <class _Tp, class _Alloc>
 template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename list<_Tp, _Alloc>::reference
 #else
 void
@@ -1597,7 +1607,7 @@
     __link_pointer __nl = __hold->__as_link();
     __link_nodes_at_back(__nl, __nl);
     ++base::__sz();
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return __hold.release()->__value_;
 #else
     __hold.release();
@@ -1787,10 +1797,10 @@
         ++__ds;
         iterator __r = iterator(__hold.release()->__as_link(), this);
         iterator __e = __r;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (--__n; __n != 0; --__n, (void) ++__e, ++__ds)
             {
                 __hold.reset(__node_alloc_traits::allocate(__na, 1));
@@ -1799,7 +1809,7 @@
                 __hold->__prev_ = __e.__ptr_;
                 __hold.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1814,7 +1824,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __link_nodes_at_back(__r.__ptr_, __e.__ptr_);
         base::__sz() += __ds;
     }
@@ -1837,10 +1847,10 @@
         __link_pointer __nl = __hold.release()->__as_link();
         iterator __r = iterator(__nl, this);
         iterator __e = __r;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (--__n; __n != 0; --__n, (void) ++__e, ++__ds)
             {
                 __hold.reset(__node_alloc_traits::allocate(__na, 1));
@@ -1849,7 +1859,7 @@
                 __hold->__prev_ = __e.__ptr_;
                 __hold.release();
             }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -1864,7 +1874,7 @@
             }
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __link_nodes(base::__end_as_link(), __r.__ptr_, __e.__ptr_);
         base::__sz() += __ds;
     }
@@ -2289,6 +2299,8 @@
     return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -2329,6 +2341,19 @@
     return !(__y < __x);
 }
 
+#else // _LIBCPP_STD_VER <= 17
+
+template<class _Tp, class _Allocator>
+inline _LIBCPP_HIDE_FROM_ABI
+__synth_three_way_result<_Tp>
+operator<=>(const list<_Tp, _Allocator>& __x, const list<_Tp, _Allocator>& __y)
+{
+    return std::lexicographical_compare_three_way(
+        __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way<_Tp, _Tp>);
+}
+
+#endif // _LIBCPP_STD_VER <= 17
+
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 void
@@ -2338,7 +2363,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY typename list<_Tp, _Allocator>::size_type
 erase_if(list<_Tp, _Allocator>& __c, _Predicate __pred) {
@@ -2358,11 +2383,11 @@
 inline constexpr bool __format::__enable_insertable<std::list<wchar_t>> = true;
 #endif
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _ValueT>
@@ -2377,9 +2402,11 @@
 #  include <algorithm>
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iosfwd>
 #  include <iterator>
+#  include <type_traits>
 #  include <typeinfo>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/locale b/third_party/llvm-project/libcxx/include/locale
index 5e925e8..251689f 100644
--- a/third_party/llvm-project/libcxx/include/locale
+++ b/third_party/llvm-project/libcxx/include/locale
@@ -202,6 +202,8 @@
 #include <__iterator/ostreambuf_iterator.h>
 #include <__locale>
 #include <__memory/unique_ptr.h>
+#include <__type_traits/make_unsigned.h>
+#include <cerrno>
 #include <cstdio>
 #include <cstdlib>
 #include <ctime>
@@ -3628,13 +3630,13 @@
     explicit wstring_convert(_Codecvt* __pcvt);
 #else
     _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_EXPLICIT_AFTER_CXX11
+    _LIBCPP_EXPLICIT_SINCE_CXX14
     wstring_convert(_Codecvt* __pcvt = new _Codecvt);
 #endif
 
     _LIBCPP_INLINE_VISIBILITY
     wstring_convert(_Codecvt* __pcvt, state_type __state);
-    _LIBCPP_EXPLICIT_AFTER_CXX11 wstring_convert(const byte_string& __byte_err,
+    _LIBCPP_EXPLICIT_SINCE_CXX14 wstring_convert(const byte_string& __byte_err,
                     const wide_string& __wide_err = wide_string());
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
@@ -3910,7 +3912,7 @@
                              _Codecvt* __pcvt = new _Codecvt,
                              state_type __state = state_type());
 #else
-    _LIBCPP_EXPLICIT_AFTER_CXX11
+    _LIBCPP_EXPLICIT_SINCE_CXX14
     wbuffer_convert(streambuf* __bytebuf = nullptr,
                     _Codecvt* __pcvt = new _Codecvt,
                     state_type __state = state_type());
diff --git a/third_party/llvm-project/libcxx/include/map b/third_party/llvm-project/libcxx/include/map
index 9cf47b2..75de40b 100644
--- a/third_party/llvm-project/libcxx/include/map
+++ b/third_party/llvm-project/libcxx/include/map
@@ -250,27 +250,32 @@
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator< (const map<Key, T, Compare, Allocator>& x,
-           const map<Key, T, Compare, Allocator>& y);
+           const map<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator!=(const map<Key, T, Compare, Allocator>& x,
-           const map<Key, T, Compare, Allocator>& y);
+           const map<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator> (const map<Key, T, Compare, Allocator>& x,
-           const map<Key, T, Compare, Allocator>& y);
+           const map<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator>=(const map<Key, T, Compare, Allocator>& x,
-           const map<Key, T, Compare, Allocator>& y);
+           const map<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator<=(const map<Key, T, Compare, Allocator>& x,
-           const map<Key, T, Compare, Allocator>& y);
+           const map<Key, T, Compare, Allocator>& y);      // removed in C++20
+
+template<class Key, class T, class Compare, class Allocator>
+  synth-three-way-result<pair<const Key, T>>
+    operator<=>(const map<Key, T, Compare, Allocator>& x,
+                const map<Key, T, Compare, Allocator>& y); // since C++20
 
 // specialized algorithms:
 template <class Key, class T, class Compare, class Allocator>
@@ -491,27 +496,32 @@
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator< (const multimap<Key, T, Compare, Allocator>& x,
-           const multimap<Key, T, Compare, Allocator>& y);
+           const multimap<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator!=(const multimap<Key, T, Compare, Allocator>& x,
-           const multimap<Key, T, Compare, Allocator>& y);
+           const multimap<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator> (const multimap<Key, T, Compare, Allocator>& x,
-           const multimap<Key, T, Compare, Allocator>& y);
+           const multimap<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator>=(const multimap<Key, T, Compare, Allocator>& x,
-           const multimap<Key, T, Compare, Allocator>& y);
+           const multimap<Key, T, Compare, Allocator>& y);      // removed in C++20
 
 template <class Key, class T, class Compare, class Allocator>
 bool
 operator<=(const multimap<Key, T, Compare, Allocator>& x,
-           const multimap<Key, T, Compare, Allocator>& y);
+           const multimap<Key, T, Compare, Allocator>& y);      // removed in C++20
+
+template<class Key, class T, class Compare, class Allocator>
+  synth-three-way-result<pair<const Key, T>>
+    operator<=>(const multimap<Key, T, Compare, Allocator>& x,
+                const multimap<Key, T, Compare, Allocator>& y); // since c++20
 
 // specialized algorithms:
 template <class Key, class T, class Compare, class Allocator>
@@ -530,6 +540,7 @@
 
 #include <__algorithm/equal.h>
 #include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/lexicographical_compare_three_way.h>
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__functional/binary_function.h>
@@ -538,6 +549,7 @@
 #include <__iterator/erase_if_container.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
+#include <__memory/addressof.h>
 #include <__memory/allocator.h>
 #include <__memory_resource/polymorphic_allocator.h>
 #include <__node_handle>
@@ -547,7 +559,6 @@
 #include <__utility/piecewise_construct.h>
 #include <__utility/swap.h>
 #include <tuple>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -601,7 +612,7 @@
       swap(static_cast<_Compare&>(*this), static_cast<_Compare&>(__y));
     }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _K2& __x, const _CP& __y) const
@@ -647,7 +658,7 @@
         swap(__comp_, __y.__comp_);
     }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _K2& __x, const _CP& __y) const
@@ -742,7 +753,7 @@
     _LIBCPP_INLINE_VISIBILITY
     value_type& __get_value()
     {
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         return *_VSTD::launder(_VSTD::addressof(__cc_));
 #else
         return __cc_;
@@ -752,7 +763,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const value_type& __get_value() const
     {
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         return *_VSTD::launder(_VSTD::addressof(__cc_));
 #else
         return __cc_;
@@ -1020,7 +1031,7 @@
     typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
     typedef __insert_return_type<iterator, node_type> insert_return_type;
 #endif
@@ -1067,7 +1078,7 @@
             insert(__f, __l);
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class _InputIterator>
     _LIBCPP_INLINE_VISIBILITY
     map(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
@@ -1130,7 +1141,7 @@
             insert(__il.begin(), __il.end());
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     map(initializer_list<value_type> __il, const allocator_type& __a)
         : map(__il, key_compare(), __a) {}
@@ -1273,7 +1284,7 @@
                 insert(__e.__i_, *__f);
         }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
     template <class... _Args>
         _LIBCPP_INLINE_VISIBILITY
@@ -1367,7 +1378,7 @@
       return __r;
     }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
     _LIBCPP_INLINE_VISIBILITY
     iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
@@ -1382,7 +1393,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {__tree_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     insert_return_type insert(node_type&& __nh)
     {
@@ -1452,7 +1463,7 @@
     iterator find(const key_type& __k)             {return __tree_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -1466,21 +1477,21 @@
     _LIBCPP_INLINE_VISIBILITY
     size_type      count(const key_type& __k) const
         {return __tree_.__count_unique(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, size_type>
     count(const _K2& __k) const {return __tree_.__count_multi(__k);}
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, bool>
     contains(const _K2& __k) const { return find(__k) != end(); }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     iterator lower_bound(const key_type& __k)
@@ -1488,7 +1499,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator lower_bound(const key_type& __k) const
         {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -1506,7 +1517,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator upper_bound(const key_type& __k) const
         {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -1523,7 +1534,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
         {return __tree_.__equal_range_unique(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<iterator,iterator>>
@@ -1677,6 +1688,8 @@
     return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -1722,6 +1735,24 @@
     return !(__y < __x);
 }
 
+#else // #if _LIBCPP_STD_VER <= 17
+
+template<class _Key, class _Tp, class _Compare, class _Allocator>
+inline _LIBCPP_HIDE_FROM_ABI
+__synth_three_way_result<pair<const _Key, _Tp>>
+operator<=>(const map<_Key, _Tp, _Compare, _Allocator>& __x,
+            const map<_Key, _Tp, _Compare, _Allocator>& __y)
+{
+    return std::lexicographical_compare_three_way(
+        __x.begin(),
+        __x.end(),
+        __y.begin(),
+        __y.end(),
+        std::__synth_three_way<pair<const _Key, _Tp>, pair<const _Key, _Tp>>);
+}
+
+#endif // #if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 void
@@ -1732,7 +1763,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Tp, class _Compare, class _Allocator,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1800,7 +1831,7 @@
     typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
 #endif
 
@@ -1846,7 +1877,7 @@
             insert(__f, __l);
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class _InputIterator>
     _LIBCPP_INLINE_VISIBILITY
     multimap(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
@@ -1910,7 +1941,7 @@
             insert(__il.begin(), __il.end());
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     multimap(initializer_list<value_type> __il, const allocator_type& __a)
         : multimap(__il, key_compare(), __a) {}
@@ -2053,7 +2084,7 @@
     iterator  erase(const_iterator __f, const_iterator __l)
         {return __tree_.erase(__f.__i_, __l.__i_);}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     iterator insert(node_type&& __nh)
     {
@@ -2127,7 +2158,7 @@
     iterator find(const key_type& __k)             {return __tree_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -2141,21 +2172,21 @@
     _LIBCPP_INLINE_VISIBILITY
     size_type      count(const key_type& __k) const
         {return __tree_.__count_multi(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, size_type>
     count(const _K2& __k) const {return __tree_.__count_multi(__k);}
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, bool>
     contains(const _K2& __k) const { return find(__k) != end(); }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     iterator lower_bound(const key_type& __k)
@@ -2163,7 +2194,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator lower_bound(const key_type& __k) const
             {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -2181,7 +2212,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator upper_bound(const key_type& __k) const
             {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
@@ -2198,7 +2229,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
             {return __tree_.__equal_range_multi(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<iterator,iterator>>
@@ -2271,6 +2302,8 @@
     return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -2316,6 +2349,24 @@
     return !(__y < __x);
 }
 
+#else // #if _LIBCPP_STD_VER <= 17
+
+template<class _Key, class _Tp, class _Compare, class _Allocator>
+inline _LIBCPP_HIDE_FROM_ABI
+__synth_three_way_result<pair<const _Key, _Tp>>
+operator<=>(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
+            const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
+{
+    return std::lexicographical_compare_three_way(
+        __x.begin(),
+        __x.end(),
+        __y.begin(),
+        __y.end(),
+        std::__synth_three_way<pair<const _Key, _Tp>, pair<const _Key, _Tp>>);
+}
+
+#endif // #if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 void
@@ -2326,7 +2377,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Tp, class _Compare, class _Allocator,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -2339,7 +2390,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _KeyT, class _ValueT, class _CompareT = std::less<_KeyT>>
@@ -2353,8 +2404,10 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iterator>
+#  include <type_traits>
 #  include <utility>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/memory b/third_party/llvm-project/libcxx/include/memory
index 0a7787a..24344d8 100644
--- a/third_party/llvm-project/libcxx/include/memory
+++ b/third_party/llvm-project/libcxx/include/memory
@@ -917,9 +917,11 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
 #  include <cstddef>
 #  include <cstdint>
+#  include <cstdlib>
 #  include <cstring>
 #  include <iosfwd>
 #  include <iterator>
diff --git a/third_party/llvm-project/libcxx/include/module.modulemap.in b/third_party/llvm-project/libcxx/include/module.modulemap.in
index 1f1d67d..7a7edbf 100644
--- a/third_party/llvm-project/libcxx/include/module.modulemap.in
+++ b/third_party/llvm-project/libcxx/include/module.modulemap.in
@@ -2,12 +2,11 @@
 // since __config may be included from C headers which may create an
 // include cycle.
 module std_config [system] [extern_c] {
-  header "__config"
+  textual header "__config"
   export *
 }
 
 module std [system] {
-  export std_config
   // FIXME: The standard does not require that each of these submodules
   // re-exports its imported modules. We should provide an alternative form of
   // export that issues a warning if a name from the submodule is used, and
@@ -62,23 +61,25 @@
     module stdbool_h {
       // <stdbool.h>'s __bool_true_false_are_defined macro requires textual inclusion.
       textual header "stdbool.h"
+      export *
     }
     module stddef_h {
       // <stddef.h>'s __need_* macros require textual inclusion.
       textual header "stddef.h"
+      export *
     }
     module stdint_h {
       header "stdint.h"
       export *
       // FIXME: This module only exists on OS X and for some reason the
-      // wildcard above doesn't export it.
+      // wildcard above doesn't export it. Removing this breaks the tests
+      // for C compatibility headers in C++17 mode with modules enabled.
       export Darwin.C.stdint
     }
     module stdio_h {
       // <stdio.h>'s __need_* macros require textual inclusion.
       textual header "stdio.h"
       export *
-      export Darwin.C.stdio
     }
     module stdlib_h {
       // <stdlib.h>'s __need_* macros require textual inclusion.
@@ -289,6 +290,9 @@
         export *
       }
       module lexicographical_compare         { private header "__algorithm/lexicographical_compare.h" }
+      module lexicographical_compare_three_way {
+        private header "__algorithm/lexicographical_compare_three_way.h"
+      }
       module lower_bound                     { private header "__algorithm/lower_bound.h" }
       module make_heap                       { private header "__algorithm/make_heap.h" }
       module make_projected                  { private header "__algorithm/make_projected.h" }
@@ -298,7 +302,10 @@
       module min                             { private header "__algorithm/min.h" }
       module min_element                     { private header "__algorithm/min_element.h" }
       module min_max_result                  { private header "__algorithm/min_max_result.h" }
-      module minmax                          { private header "__algorithm/minmax.h" }
+      module minmax                          {
+        private header "__algorithm/minmax.h"
+        export *
+      }
       module minmax_element                  { private header "__algorithm/minmax_element.h" }
       module mismatch                        { private header "__algorithm/mismatch.h" }
       module move                            { private header "__algorithm/move.h" }
@@ -596,11 +603,15 @@
       module stable_partition                { private header "__algorithm/stable_partition.h" }
       module stable_sort                     { private header "__algorithm/stable_sort.h" }
       module swap_ranges                     { private header "__algorithm/swap_ranges.h" }
+      module three_way_comp_ref_type         { private header "__algorithm/three_way_comp_ref_type.h" }
       module transform                       { private header "__algorithm/transform.h" }
       module unique                          { private header "__algorithm/unique.h" }
       module unique_copy                     { private header "__algorithm/unique_copy.h" }
       module unwrap_iter                     { private header "__algorithm/unwrap_iter.h" }
-      module unwrap_range                    { private header "__algorithm/unwrap_range.h" }
+      module unwrap_range {
+        private header "__algorithm/unwrap_range.h"
+        export utility.__utility.pair
+      }
       module upper_bound                     { private header "__algorithm/upper_bound.h" }
     }
   }
@@ -618,6 +629,26 @@
   module atomic {
     header "atomic"
     export *
+
+    module __atomic {
+      module aliases             {
+        private header "__atomic/aliases.h"
+        export atomic
+      }
+      module atomic              { private header "__atomic/atomic.h" }
+      module atomic_base         { private header "__atomic/atomic_base.h" }
+      module atomic_flag         { private header "__atomic/atomic_flag.h" }
+      module atomic_init         { private header "__atomic/atomic_init.h" }
+      module atomic_lock_free    { private header "__atomic/atomic_lock_free.h" }
+      module atomic_sync         { private header "__atomic/atomic_sync.h" }
+      module check_memory_order  { private header "__atomic/check_memory_order.h" }
+      module contention_t        { private header "__atomic/contention_t.h" }
+      module cxx_atomic_impl     { private header "__atomic/cxx_atomic_impl.h" }
+      module fence               { private header "__atomic/fence.h" }
+      module is_always_lock_free { private header "__atomic/is_always_lock_free.h" }
+      module kill_dependency     { private header "__atomic/kill_dependency.h" }
+      module memory_order        { private header "__atomic/memory_order.h" }
+    }
   }
   module barrier {
     @requires_LIBCXX_ENABLE_THREADS@
@@ -656,11 +687,16 @@
     export *
 
     module __charconv {
-      module chars_format      { private header "__charconv/chars_format.h" }
-      module from_chars_result { private header "__charconv/from_chars_result.h" }
-      module tables            { private header "__charconv/tables.h" }
-      module to_chars_base_10  { private header "__charconv/to_chars_base_10.h" }
-      module to_chars_result   { private header "__charconv/to_chars_result.h" }
+      module chars_format            { private header "__charconv/chars_format.h" }
+      module from_chars_integral     { private header "__charconv/from_chars_integral.h" }
+      module from_chars_result       { private header "__charconv/from_chars_result.h" }
+      module tables                  { private header "__charconv/tables.h" }
+      module to_chars                { private header "__charconv/to_chars.h" }
+      module to_chars_base_10        { private header "__charconv/to_chars_base_10.h" }
+      module to_chars_floating_point { private header "__charconv/to_chars_floating_point.h" }
+      module to_chars_integral       { private header "__charconv/to_chars_integral.h" }
+      module to_chars_result         { private header "__charconv/to_chars_result.h" }
+      module traits                  { private header "__charconv/traits.h" }
     }
 
   }
@@ -670,6 +706,7 @@
 
     module __chrono {
       module calendar               { private header "__chrono/calendar.h" }
+      module concepts               { private header "__chrono/concepts.h" }
       module convert_to_timespec    { private header "__chrono/convert_to_timespec.h" }
       module convert_to_tm          { private header "__chrono/convert_to_tm.h" }
       module day                    { private header "__chrono/day.h" }
@@ -755,13 +792,19 @@
       module derived_from               { private header "__concepts/derived_from.h" }
       module destructible               { private header "__concepts/destructible.h" }
       module different_from             { private header "__concepts/different_from.h" }
-      module equality_comparable        { private header "__concepts/equality_comparable.h" }
+      module equality_comparable {
+        private header "__concepts/equality_comparable.h"
+        export type_traits.common_reference
+      }
       module invocable                  { private header "__concepts/invocable.h" }
       module movable                    { private header "__concepts/movable.h" }
       module predicate                  { private header "__concepts/predicate.h" }
       module regular                    { private header "__concepts/regular.h" }
       module relation                   { private header "__concepts/relation.h" }
-      module same_as                    { private header "__concepts/same_as.h" }
+      module same_as {
+        private header "__concepts/same_as.h"
+        export type_traits.is_same
+      }
       module semiregular                { private header "__concepts/semiregular.h" }
       module swappable                  { private header "__concepts/swappable.h" }
       module totally_ordered            { private header "__concepts/totally_ordered.h" }
@@ -770,9 +813,12 @@
   module condition_variable {
     header "condition_variable"
     export *
+
+    module __condition_variable {
+      module condition_variable { private header "__condition_variable/condition_variable.h" }
+    }
   }
   module coroutine {
-    requires coroutines
     header "coroutine"
     export compare
     export *
@@ -792,6 +838,14 @@
   module exception {
     header "exception"
     export *
+
+    module __exception {
+      module exception        { private header "__exception/exception.h" }
+      module exception_ptr    { private header "__exception/exception_ptr.h" }
+      module nested_exception { private header "__exception/nested_exception.h" }
+      module operations       { private header "__exception/operations.h" }
+      module terminate        { private header "__exception/terminate.h" }
+    }
   }
   module execution {
     header "execution"
@@ -850,9 +904,13 @@
         private header "__format/format_context.h"
         export optional
         export locale
+        export __locale
       }
       module format_error                    { private header "__format/format_error.h" }
-      module format_functions                { private header "__format/format_functions.h" }
+      module format_functions                {
+        private header "__format/format_functions.h"
+        export string
+      }
       module format_fwd                      { private header "__format/format_fwd.h" }
       module format_parse_context            { private header "__format/format_parse_context.h" }
       module format_string                   { private header "__format/format_string.h" }
@@ -979,7 +1037,11 @@
       module back_insert_iterator  { private header "__iterator/back_insert_iterator.h" }
       module bounded_iter          { private header "__iterator/bounded_iter.h" }
       module common_iterator       { private header "__iterator/common_iterator.h" }
-      module concepts              { private header "__iterator/concepts.h" }
+      module concepts {
+        private header "__iterator/concepts.h"
+        export concepts.equality_comparable
+        export type_traits.common_reference
+      }
       module counted_iterator      { private header "__iterator/counted_iterator.h" }
       module data                  { private header "__iterator/data.h" }
       module default_sentinel      { private header "__iterator/default_sentinel.h" }
@@ -1012,7 +1074,10 @@
       module permutable            { private header "__iterator/permutable.h" }
       module prev                  { private header "__iterator/prev.h" }
       module projected             { private header "__iterator/projected.h" }
-      module readable_traits       { private header "__iterator/readable_traits.h" }
+      module readable_traits       {
+        private header "__iterator/readable_traits.h"
+        export __iterator.iterator_traits
+      }
       module reverse_access        { private header "__iterator/reverse_access.h" }
       module reverse_iterator      { private header "__iterator/reverse_iterator.h" }
       module segmented_iterator    { private header "__iterator/segmented_iterator.h" }
@@ -1061,6 +1126,7 @@
     module __memory {
       module addressof                       { private header "__memory/addressof.h" }
       module align                           { private header "__memory/align.h" }
+      module aligned_alloc                   { private header "__memory/aligned_alloc.h" }
       module allocate_at_least               { private header "__memory/allocate_at_least.h" }
       module allocation_guard                { private header "__memory/allocation_guard.h" }
       module allocator                       { private header "__memory/allocator.h" }
@@ -1071,7 +1137,10 @@
       module auto_ptr                        { private header "__memory/auto_ptr.h" }
       module builtin_new_allocator           { private header "__memory/builtin_new_allocator.h" }
       module compressed_pair                 { private header "__memory/compressed_pair.h" }
-      module concepts                        { private header "__memory/concepts.h" }
+      module concepts                        {
+        private header "__memory/concepts.h"
+        export type_traits.remove_reference
+      }
       module construct_at                    { private header "__memory/construct_at.h" }
       module destruct_n                      { private header "__memory/destruct_n.h" }
       module pointer_traits                  { private header "__memory/pointer_traits.h" }
@@ -1110,6 +1179,13 @@
     @requires_LIBCXX_ENABLE_THREADS@
     header "mutex"
     export *
+
+    module __mutex {
+      module lock_guard  { private header "__mutex/lock_guard.h" }
+      module mutex       { private header "__mutex/mutex.h" }
+      module tag_types   { private header "__mutex/tag_types.h" }
+      module unique_lock { private header "__mutex/unique_lock.h" }
+    }
   }
   module new {
     header "new"
@@ -1339,6 +1415,7 @@
     export string_view
     module __string {
       module char_traits           { private header "__string/char_traits.h" }
+      module constexpr_c_functions { private header "__string/constexpr_c_functions.h" }
       module extern_template_lists { private header "__string/extern_template_lists.h" }
       module string_fwd            { private header "__fwd/string.h" }
     }
@@ -1357,7 +1434,24 @@
   }
   module system_error {
     header "system_error"
+    export __errc
     export *
+    module __system_error {
+      module errc           { private header "__system_error/errc.h" }
+      module error_category { private header "__system_error/error_category.h" }
+      module error_code {
+        private header "__system_error/error_code.h"
+        export functional.__functional.hash
+        export functional.__functional.unary_function
+      }
+      module error_condition {
+        private header "__system_error/error_condition.h"
+        export functional.__functional.hash
+        export functional.__functional.unary_function
+      }
+      module system_error { private header "__system_error/system_error.h" }
+
+    }
   }
   module thread {
     @requires_LIBCXX_ENABLE_THREADS@
@@ -1373,18 +1467,18 @@
     header "tuple"
     export *
 
-    module apply_cv         { private header "__tuple_dir/apply_cv.h" }
+    module apply_cv         { private header "__tuple/apply_cv.h" }
     module get_fwd          { private header "__fwd/get.h" }
-    module make_tuple_types { private header "__tuple_dir/make_tuple_types.h" }
-    module pair_like        { private header "__tuple_dir/pair_like.h" }
-    module sfinae_helpers   { private header "__tuple_dir/sfinae_helpers.h" }
-    module tuple_element    { private header "__tuple_dir/tuple_element.h" }
+    module make_tuple_types { private header "__tuple/make_tuple_types.h" }
+    module pair_like        { private header "__tuple/pair_like.h" }
+    module sfinae_helpers   { private header "__tuple/sfinae_helpers.h" }
+    module tuple_element    { private header "__tuple/tuple_element.h" }
     module tuple_fwd        { private header "__fwd/tuple.h" }
-    module tuple_indices    { private header "__tuple_dir/tuple_indices.h" }
-    module tuple_like       { private header "__tuple_dir/tuple_like.h" }
-    module tuple_like_ext   { private header "__tuple_dir/tuple_like_ext.h" }
-    module tuple_size       { private header "__tuple_dir/tuple_size.h" }
-    module tuple_types      { private header "__tuple_dir/tuple_types.h" }
+    module tuple_indices    { private header "__tuple/tuple_indices.h" }
+    module tuple_like       { private header "__tuple/tuple_like.h" }
+    module tuple_like_ext   { private header "__tuple/tuple_like_ext.h" }
+    module tuple_size       { private header "__tuple/tuple_size.h" }
+    module tuple_types      { private header "__tuple/tuple_types.h" }
   }
   module type_traits {
     header "type_traits"
@@ -1449,6 +1543,10 @@
     module is_destructible                     { private header "__type_traits/is_destructible.h" }
     module is_empty                            { private header "__type_traits/is_empty.h" }
     module is_enum                             { private header "__type_traits/is_enum.h" }
+    module is_equality_comparable                       {
+      private header "__type_traits/is_equality_comparable.h"
+      export integral_constant
+    }
     module is_final                            { private header "__type_traits/is_final.h" }
     module is_floating_point                   { private header "__type_traits/is_floating_point.h" }
     module is_function                         { private header "__type_traits/is_function.h" }
@@ -1519,6 +1617,7 @@
     module nat                                 { private header "__type_traits/nat.h" }
     module negation                            { private header "__type_traits/negation.h" }
     module noexcept_move_assign_container      { private header "__type_traits/noexcept_move_assign_container.h" }
+    module predicate_traits                    { private header "__type_traits/predicate_traits.h" }
     module promote                             { private header "__type_traits/promote.h" }
     module rank                                { private header "__type_traits/rank.h" }
     module remove_all_extents                  { private header "__type_traits/remove_all_extents.h" }
@@ -1534,7 +1633,11 @@
     module strip_signature                     { private header "__type_traits/strip_signature.h" }
     module type_identity                       { private header "__type_traits/type_identity.h" }
     module type_list                           { private header "__type_traits/type_list.h" }
-    module underlying_type                     { private header "__type_traits/underlying_type.h" }
+    module underlying_type                     {
+      private header "__type_traits/underlying_type.h"
+
+      export type_traits
+    }
     module void_t                              { private header "__type_traits/void_t.h" }
   }
   module typeindex {
@@ -1562,7 +1665,10 @@
 
     module __utility {
       module as_const            { private header "__utility/as_const.h" }
-      module auto_cast           { private header "__utility/auto_cast.h" }
+      module auto_cast           {
+        private header "__utility/auto_cast.h"
+        export type_traits.decay
+      }
       module cmp                 { private header "__utility/cmp.h" }
       module convert_to_integral { private header "__utility/convert_to_integral.h" }
       module declval             { private header "__utility/declval.h" }
@@ -1611,20 +1717,14 @@
   module __availability      { private header "__availability"      export * }
   module __bit_reference     { private header "__bit_reference"     export * }
   module __debug             {         header "__debug"             export * }
-  module __errc              { private header "__errc"              export * }
   module __hash_table        {         header "__hash_table"        export * }
   module __locale            {
     @requires_LIBCXX_ENABLE_LOCALIZATION@
     private header "__locale" export *
   }
   module __mbstate_t         { private header "__mbstate_t.h"       export * }
-  module __mutex_base        { private header "__mutex_base"        export * }
   module __node_handle       { private header "__node_handle"       export * }
   module __split_buffer      { private header "__split_buffer"      export * }
-  module __std_stream        {
-    @requires_LIBCXX_ENABLE_LOCALIZATION@
-    private header "__std_stream" export *
-  }
   module __threading_support {         header "__threading_support" export * }
   module __tree              {         header "__tree"              export * }
   module __undef_macros      {         header "__undef_macros"      export * }
@@ -1633,15 +1733,6 @@
   module experimental {
     requires cplusplus11
 
-    module algorithm {
-      header "experimental/algorithm"
-      export *
-    }
-    module coroutine {
-      requires coroutines
-      header "experimental/coroutine"
-      export *
-    }
     module deque {
       header "experimental/deque"
       export *
@@ -1650,10 +1741,6 @@
       header "experimental/forward_list"
       export *
     }
-    module functional {
-      header "experimental/functional"
-      export *
-    }
     module iterator {
       header "experimental/iterator"
       export *
diff --git a/third_party/llvm-project/libcxx/include/mutex b/third_party/llvm-project/libcxx/include/mutex
index d93fba8..ed9b43d 100644
--- a/third_party/llvm-project/libcxx/include/mutex
+++ b/third_party/llvm-project/libcxx/include/mutex
@@ -187,9 +187,15 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__chrono/steady_clock.h>
+#include <__chrono/time_point.h>
+#include <__condition_variable/condition_variable.h>
 #include <__config>
 #include <__memory/shared_ptr.h>
-#include <__mutex_base>
+#include <__mutex/lock_guard.h>
+#include <__mutex/mutex.h>
+#include <__mutex/tag_types.h>
+#include <__mutex/unique_lock.h>
 #include <__threading_support>
 #include <__utility/forward.h>
 #include <cstdint>
@@ -262,9 +268,9 @@
 {
     using namespace chrono;
     unique_lock<mutex> __lk(__m_);
-    bool no_timeout = _Clock::now() < __t;
-    while (no_timeout && __locked_)
-        no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
+    bool __no_timeout = _Clock::now() < __t;
+    while (__no_timeout && __locked_)
+        __no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
     if (!__locked_)
     {
         __locked_ = true;
@@ -304,7 +310,7 @@
 {
     using namespace chrono;
     __thread_id __id = this_thread::get_id();
-    unique_lock<mutex> lk(__m_);
+    unique_lock<mutex> __lk(__m_);
     if (__id == __id_)
     {
         if (__count_ == numeric_limits<size_t>::max())
@@ -312,9 +318,9 @@
         ++__count_;
         return true;
     }
-    bool no_timeout = _Clock::now() < __t;
-    while (no_timeout && __count_ != 0)
-        no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout;
+    bool __no_timeout = _Clock::now() < __t;
+    while (__no_timeout && __count_ != 0)
+        __no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
     if (__count_ == 0)
     {
         __count_ = 1;
@@ -328,7 +334,7 @@
 _LIBCPP_HIDE_FROM_ABI int
 try_lock(_L0& __l0, _L1& __l1)
 {
-    unique_lock<_L0> __u0(__l0, try_to_lock);
+    unique_lock<_L0> __u0(__l0, try_to_lock_t());
     if (__u0.owns_lock())
     {
         if (__l1.try_lock())
@@ -467,7 +473,7 @@
 
 #endif // _LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class ..._Mutexes>
 class _LIBCPP_TEMPLATE_VIS scoped_lock;
 
@@ -544,7 +550,7 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(scoped_lock);
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 #endif // !_LIBCPP_HAS_NO_THREADS
 
 struct _LIBCPP_TEMPLATE_VIS once_flag;
@@ -704,9 +710,18 @@
 _LIBCPP_POP_MACROS
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
+#  include <cstring>
+#  include <ctime>
 #  include <functional>
+#  include <initializer_list>
+#  include <new>
+#  include <stdexcept>
+#  include <system_error>
 #  include <type_traits>
+#  include <typeinfo>
 #endif
 
 #endif // _LIBCPP_MUTEX
diff --git a/third_party/llvm-project/libcxx/include/new b/third_party/llvm-project/libcxx/include/new
index 0c826f4..af396cd 100644
--- a/third_party/llvm-project/libcxx/include/new
+++ b/third_party/llvm-project/libcxx/include/new
@@ -89,12 +89,14 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__availability>
 #include <__config>
+#include <__exception/exception.h>
+#include <__type_traits/alignment_of.h>
 #include <__type_traits/is_function.h>
 #include <__type_traits/is_same.h>
 #include <__type_traits/remove_cv.h>
+#include <__verbose_abort>
 #include <cstddef>
 #include <cstdlib>
-#include <exception>
 #include <version>
 
 #if defined(_LIBCPP_ABI_VCRUNTIME)
@@ -173,10 +175,10 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_array_new_length()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_array_new_length();
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_array_new_length was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -189,14 +191,14 @@
 #endif
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 // Enable the declaration even if the compiler doesn't support the language
 // feature.
 struct destroying_delete_t {
   explicit destroying_delete_t() = default;
 };
 inline constexpr destroying_delete_t destroying_delete{};
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 } // namespace std
 
@@ -332,46 +334,6 @@
 #endif
 }
 
-#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
-// Low-level helpers to call the aligned allocation and deallocation functions
-// on the target platform. This is used to implement libc++'s own memory
-// allocation routines -- if you need to allocate memory inside the library,
-// chances are that you want to use `__libcpp_allocate` instead.
-//
-// Returns the allocated memory, or `nullptr` on failure.
-inline _LIBCPP_INLINE_VISIBILITY void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) {
-#  if defined(_LIBCPP_MSVCRT_LIKE)
-    return ::_aligned_malloc(__size, __alignment);
-#  elif _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_C11_ALIGNED_ALLOC)
-    // aligned_alloc() requires that __size is a multiple of __alignment,
-    // but for C++ [new.delete.general], only states "if the value of an
-    // alignment argument passed to any of these functions is not a valid
-    // alignment value, the behavior is undefined".
-    // To handle calls such as ::operator new(1, std::align_val_t(128)), we
-    // round __size up to the next multiple of __alignment.
-    size_t __rounded_size = (__size + __alignment - 1) & ~(__alignment - 1);
-    // Rounding up could have wrapped around to zero, so we have to add another
-    // max() ternary to the actual call site to avoid succeeded in that case.
-    return ::aligned_alloc(__alignment, __size > __rounded_size ? __size : __rounded_size);
-#  else
-    void* __result = nullptr;
-    (void)::posix_memalign(&__result, __alignment, __size);
-    // If posix_memalign fails, __result is unmodified so we still return `nullptr`.
-    return __result;
-#  endif
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-void __libcpp_aligned_free(void* __ptr) {
-#if defined(_LIBCPP_MSVCRT_LIKE)
-  ::_aligned_free(__ptr);
-#else
-  ::free(__ptr);
-#endif
-}
-#endif // !_LIBCPP_HAS_NO_ALIGNED_ALLOCATION
-
-
 template <class _Tp>
 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI
 _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT
@@ -381,7 +343,7 @@
     return __builtin_launder(__p);
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI
 constexpr _Tp* launder(_Tp* __p) noexcept
@@ -390,7 +352,7 @@
 }
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 #if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
 
@@ -399,11 +361,12 @@
 
 #endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <exception>
 #  include <type_traits>
 #endif
 
diff --git a/third_party/llvm-project/libcxx/include/numbers b/third_party/llvm-project/libcxx/include/numbers
index 72034a6..ec9eea5 100644
--- a/third_party/llvm-project/libcxx/include/numbers
+++ b/third_party/llvm-project/libcxx/include/numbers
@@ -63,7 +63,7 @@
 #include <__config>
 #include <version>
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -128,7 +128,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
diff --git a/third_party/llvm-project/libcxx/include/optional b/third_party/llvm-project/libcxx/include/optional
index 6a7e2d2..ddb3f19 100644
--- a/third_party/llvm-project/libcxx/include/optional
+++ b/third_party/llvm-project/libcxx/include/optional
@@ -165,16 +165,26 @@
 #include <__functional/hash.h>
 #include <__functional/invoke.h>
 #include <__functional/unary_function.h>
+#include <__memory/addressof.h>
 #include <__memory/construct_at.h>
-#include <__tuple_dir/sfinae_helpers.h>
+#include <__tuple/sfinae_helpers.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/disjunction.h>
+#include <__type_traits/is_trivially_copy_assignable.h>
+#include <__type_traits/is_trivially_copy_constructible.h>
+#include <__type_traits/is_trivially_destructible.h>
+#include <__type_traits/is_trivially_move_assignable.h>
+#include <__type_traits/is_trivially_move_constructible.h>
+#include <__type_traits/negation.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
+#include <__verbose_abort>
 #include <initializer_list>
 #include <new>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -200,7 +210,7 @@
 
 } // namespace std
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -208,10 +218,10 @@
 inline _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
 void __throw_bad_optional_access() {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         throw bad_optional_access();
 #else
-        _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_optional_access was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -259,7 +269,7 @@
         :  __val_(_VSTD::forward<_Args>(__args)...),
            __engaged_(true) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   template <class _Fp, class... _Args>
   _LIBCPP_HIDE_FROM_ABI
   constexpr __optional_destruct_base(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
@@ -301,7 +311,7 @@
         :  __val_(_VSTD::forward<_Args>(__args)...),
            __engaged_(true) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   template <class _Fp, class... _Args>
   _LIBCPP_HIDE_FROM_ABI
   constexpr __optional_destruct_base(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
@@ -357,7 +367,7 @@
     _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct(_Args&&... __args)
     {
         _LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         _VSTD::construct_at(_VSTD::addressof(this->__val_), _VSTD::forward<_Args>(__args)...);
 #else
         ::new ((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
@@ -805,7 +815,7 @@
         this->__construct_from(_VSTD::move(__v));
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   template<class _Fp, class... _Args>
   _LIBCPP_HIDE_FROM_ABI
   constexpr explicit optional(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
@@ -1047,7 +1057,7 @@
                                   static_cast<value_type>(_VSTD::forward<_Up>(__v));
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   template<class _Func>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
   constexpr auto and_then(_Func&& __f) & {
@@ -1171,7 +1181,7 @@
       return _VSTD::move(*this);
     return _VSTD::forward<_Func>(__f)();
   }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     using __base::reset;
 };
@@ -1572,7 +1582,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
@@ -1583,6 +1593,7 @@
 #  include <memory>
 #  include <ratio>
 #  include <tuple>
+#  include <type_traits>
 #  include <typeinfo>
 #  include <utility>
 #  include <variant>
diff --git a/third_party/llvm-project/libcxx/include/ostream b/third_party/llvm-project/libcxx/include/ostream
index 4780c76..610a283 100644
--- a/third_party/llvm-project/libcxx/include/ostream
+++ b/third_party/llvm-project/libcxx/include/ostream
@@ -165,8 +165,15 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
+#include <__exception/operations.h>
 #include <__memory/shared_ptr.h>
 #include <__memory/unique_ptr.h>
+#include <__system_error/error_code.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_base_of.h>
+#include <__type_traits/void_t.h>
+#include <__utility/declval.h>
 #include <bitset>
 #include <ios>
 #include <locale>
@@ -244,7 +251,7 @@
     basic_ostream& operator<<(long double __f);
     basic_ostream& operator<<(const void* __p);
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI
     basic_ostream& operator<<(const volatile void* __p) {
         return operator<<(const_cast<const void*>(__p));
@@ -253,7 +260,7 @@
 
     basic_ostream& operator<<(basic_streambuf<char_type, traits_type>* __sb);
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 // LWG 2221 - nullptr. This is not backported to older standards modes.
 // See https://reviews.llvm.org/D127033 for more info on the rationale.
     _LIBCPP_INLINE_VISIBILITY
@@ -314,18 +321,18 @@
     if (__os_.rdbuf() && __os_.good() && (__os_.flags() & ios_base::unitbuf)
                       && !uncaught_exception())
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             if (__os_.rdbuf()->pubsync() == -1)
                 __os_.setstate(ios_base::badbit);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -352,19 +359,19 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(basic_streambuf<char_type, traits_type>* __sb)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
             if (__sb)
             {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
                 try
                 {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
                     typedef istreambuf_iterator<_CharT, _Traits> _Ip;
                     typedef ostreambuf_iterator<_CharT, _Traits> _Op;
                     _Ip __i(__sb);
@@ -379,24 +386,24 @@
                     }
                     if (__c == 0)
                         this->setstate(ios_base::failbit);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
                 }
                 catch (...)
                 {
                     this->__set_failbit_and_consider_rethrow();
                 }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             }
             else
                 this->setstate(ios_base::badbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -404,10 +411,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(bool __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -416,13 +423,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -430,10 +437,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(short __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -446,13 +453,13 @@
                         static_cast<long>(__n)).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -460,10 +467,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(unsigned short __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -472,13 +479,13 @@
             if (__f.put(*this, *this, this->fill(), static_cast<unsigned long>(__n)).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -486,10 +493,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(int __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -502,13 +509,13 @@
                         static_cast<long>(__n)).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -516,10 +523,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(unsigned int __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -528,13 +535,13 @@
             if (__f.put(*this, *this, this->fill(), static_cast<unsigned long>(__n)).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -542,10 +549,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(long __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -554,13 +561,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -568,10 +575,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(unsigned long __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -580,13 +587,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -594,10 +601,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(long long __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -606,13 +613,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -620,10 +627,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(unsigned long long __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -632,13 +639,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -646,10 +653,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(float __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -658,13 +665,13 @@
             if (__f.put(*this, *this, this->fill(), static_cast<double>(__n)).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -672,10 +679,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(double __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -684,13 +691,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -698,10 +705,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(long double __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -710,13 +717,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -724,10 +731,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::operator<<(const void* __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -736,13 +743,13 @@
             if (__f.put(*this, *this, this->fill(), __n).failed())
                 this->setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -751,10 +758,10 @@
 __put_character_sequence(basic_ostream<_CharT, _Traits>& __os,
                           const _CharT* __str, size_t __len)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_ostream<_CharT, _Traits>::sentry __s(__os);
         if (__s)
         {
@@ -769,13 +776,13 @@
                                       __os.fill()).failed())
                 __os.setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __os.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __os;
 }
 
@@ -791,10 +798,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, char __cn)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_ostream<_CharT, _Traits>::sentry __s(__os);
         if (__s)
         {
@@ -810,13 +817,13 @@
                                       __os.fill()).failed())
                 __os.setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __os.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __os;
 }
 
@@ -852,10 +859,10 @@
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const char* __strn)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         typename basic_ostream<_CharT, _Traits>::sentry __s(__os);
         if (__s)
         {
@@ -884,13 +891,13 @@
                                       __os.fill()).failed())
                 __os.setstate(ios_base::badbit | ios_base::failbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         __os.__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return __os;
 }
 
@@ -921,10 +928,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::put(char_type __c)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __s(*this);
         if (__s)
         {
@@ -934,13 +941,13 @@
             if (__o.failed())
                 this->setstate(ios_base::badbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -948,23 +955,23 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::write(const char_type* __s, streamsize __n)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         sentry __sen(*this);
         if (__sen && __n)
         {
             if (this->rdbuf()->sputn(__s, __n) != __n)
                 this->setstate(ios_base::badbit);
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -972,10 +979,10 @@
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::flush()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         if (this->rdbuf())
         {
             sentry __s(*this);
@@ -985,13 +992,13 @@
                     this->setstate(ios_base::badbit);
             }
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
         this->__set_badbit_and_consider_rethrow();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return *this;
 }
 
@@ -1130,7 +1137,7 @@
                          std::use_facet<ctype<_CharT> >(__os.getloc()).widen('1'));
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class _Traits>
@@ -1179,7 +1186,7 @@
 template <class _Traits>
 basic_ostream<char, _Traits>& operator<<(basic_ostream<char, _Traits>&, const char32_t*) = delete;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<char>;
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -1189,7 +1196,9 @@
 _LIBCPP_END_NAMESPACE_STD
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iterator>
 #  include <type_traits>
 #endif
diff --git a/third_party/llvm-project/libcxx/include/queue b/third_party/llvm-project/libcxx/include/queue
index 6c1b892..9690aaf 100644
--- a/third_party/llvm-project/libcxx/include/queue
+++ b/third_party/llvm-project/libcxx/include/queue
@@ -227,7 +227,6 @@
 #include <__memory/uses_allocator.h>
 #include <__utility/forward.h>
 #include <deque>
-#include <type_traits>
 #include <vector>
 #include <version>
 
@@ -278,7 +277,7 @@
     _LIBCPP_INLINE_VISIBILITY
     queue(const queue& __q) : c(__q.c) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class _InputIterator,
               class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value>>
     _LIBCPP_HIDE_FROM_ABI
@@ -363,7 +362,7 @@
     void push(value_type&& __v)      {c.push_back(_VSTD::move(__v));}
     template <class... _Args>
         _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         decltype(auto) emplace(_Args&&... __args)
             { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
 #else
@@ -397,7 +396,7 @@
     operator< (const queue<_T1, _C1>& __x,const queue<_T1, _C1>& __y);
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Container,
          class = enable_if_t<!__is_allocator<_Container>::value>
 >
@@ -413,7 +412,7 @@
     -> queue<typename _Container::value_type, _Container>;
 #endif
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _InputIterator,
           class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value>>
 queue(_InputIterator, _InputIterator)
@@ -964,7 +963,9 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_QUEUE
diff --git a/third_party/llvm-project/libcxx/include/random b/third_party/llvm-project/libcxx/include/random
index 5fe4906..02d71ad 100644
--- a/third_party/llvm-project/libcxx/include/random
+++ b/third_party/llvm-project/libcxx/include/random
@@ -1734,6 +1734,7 @@
 #  include <concepts>
 #  include <cstddef>
 #  include <cstdint>
+#  include <cstdlib>
 #  include <iosfwd>
 #  include <limits>
 #  include <numeric>
diff --git a/third_party/llvm-project/libcxx/include/ranges b/third_party/llvm-project/libcxx/include/ranges
index f999fa0..8f3b4b2 100644
--- a/third_party/llvm-project/libcxx/include/ranges
+++ b/third_party/llvm-project/libcxx/include/ranges
@@ -49,6 +49,8 @@
     using range_reference_t = iter_reference_t<iterator_t<R>>;
   template<range R>
     using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<R>>;
+  template <range R>
+    using range_common_reference_t = iter_common_reference_t<iterator_t<R>>;
 
   // [range.sized], sized ranges
   template<class>
@@ -375,7 +377,6 @@
 #include <__ranges/view_interface.h>
 #include <__ranges/views.h>
 #include <__ranges/zip_view.h>
-#include <type_traits>
 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
@@ -390,11 +391,16 @@
 #include <iterator>
 
 // [tuple.helper]
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_RANGES
diff --git a/third_party/llvm-project/libcxx/include/ratio b/third_party/llvm-project/libcxx/include/ratio
index 3969a39..327e08c 100644
--- a/third_party/llvm-project/libcxx/include/ratio
+++ b/third_party/llvm-project/libcxx/include/ratio
@@ -501,7 +501,7 @@
                   __static_lcm<_R1::den, _R2::den>::value> type;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _R1, class _R2>
 inline constexpr bool ratio_equal_v = ratio_equal<_R1, _R2>::value;
 
diff --git a/third_party/llvm-project/libcxx/include/regex b/third_party/llvm-project/libcxx/include/regex
index 06c017f..f89b828 100644
--- a/third_party/llvm-project/libcxx/include/regex
+++ b/third_party/llvm-project/libcxx/include/regex
@@ -225,6 +225,8 @@
     int compare(const sub_match& s) const;
     int compare(const string_type& s) const;
     int compare(const value_type* s) const;
+
+    void swap(sub_match& s) noexcept(see below);
 };
 
 typedef sub_match<const char*>             csub_match;
@@ -770,10 +772,11 @@
 #include <__iterator/wrap_iter.h>
 #include <__locale>
 #include <__memory_resource/polymorphic_allocator.h>
+#include <__type_traits/is_swappable.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <__utility/swap.h>
-#include <cstring>
+#include <__verbose_abort>
 #include <deque>
 #include <stdexcept>
 #include <string>
@@ -1012,10 +1015,10 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_regex_error()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw regex_error(_Ev);
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("regex_error was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -4131,9 +4134,9 @@
 {
     // Found [=
     //   This means =] must exist
-    value_type _Equal_close[2] = {'=', ']'};
-    _ForwardIterator __temp = _VSTD::search(__first, __last, _Equal_close,
-                                                            _Equal_close+2);
+    value_type __equal_close[2] = {'=', ']'};
+    _ForwardIterator __temp = _VSTD::search(__first, __last, __equal_close,
+                                                            __equal_close+2);
     if (__temp == __last)
         __throw_regex_error<regex_constants::error_brack>();
     // [__first, __temp) contains all text in [= ... =]
@@ -4173,9 +4176,9 @@
 {
     // Found [:
     //   This means :] must exist
-    value_type _Colon_close[2] = {':', ']'};
-    _ForwardIterator __temp = _VSTD::search(__first, __last, _Colon_close,
-                                                            _Colon_close+2);
+    value_type __colon_close[2] = {':', ']'};
+    _ForwardIterator __temp = _VSTD::search(__first, __last, __colon_close,
+                                                            __colon_close+2);
     if (__temp == __last)
         __throw_regex_error<regex_constants::error_brack>();
     // [__first, __temp) contains all text in [: ... :]
@@ -4198,9 +4201,9 @@
 {
     // Found [.
     //   This means .] must exist
-    value_type _Dot_close[2] = {'.', ']'};
-    _ForwardIterator __temp = _VSTD::search(__first, __last, _Dot_close,
-                                                            _Dot_close+2);
+    value_type __dot_close[2] = {'.', ']'};
+    _ForwardIterator __temp = _VSTD::search(__first, __last, __dot_close,
+                                                            __dot_close+2);
     if (__temp == __last)
         __throw_regex_error<regex_constants::error_brack>();
     // [__first, __temp) contains all text in [. ... .]
@@ -5009,6 +5012,16 @@
     _LIBCPP_INLINE_VISIBILITY
     int compare(const value_type* __s) const
         {return str().compare(__s);}
+
+    _LIBCPP_HIDE_FROM_ABI
+    void swap(sub_match& __s)
+#ifndef _LIBCPP_CXX03_LANG
+    _NOEXCEPT(__is_nothrow_swappable<_BidirectionalIterator>::value)
+#endif // _LIBCPP_CXX03_LANG
+    {
+        this->pair<_BidirectionalIterator, _BidirectionalIterator>::swap(__s);
+        std::swap(matched, __s.matched);
+    }
 };
 
 template <class _BiIter>
@@ -5861,7 +5874,7 @@
 {
     deque<__state> __states;
     ptrdiff_t __highest_j = 0;
-    ptrdiff_t _Np = _VSTD::distance(__first, __last);
+    ptrdiff_t __np = _VSTD::distance(__first, __last);
     __node* __st = __start_.get();
     if (__st)
     {
@@ -5904,7 +5917,7 @@
                 if (!__matched || __highest_j < __s.__current_ - __s.__first_)
                     __highest_j = __s.__current_ - __s.__first_;
                 __matched = true;
-                if (__highest_j == _Np)
+                if (__highest_j == __np)
                     __states.clear();
                 else
                     __states.pop_back();
@@ -5956,7 +5969,7 @@
     vector<__state> __states;
     __state __best_state;
     ptrdiff_t __highest_j = 0;
-    ptrdiff_t _Np = _VSTD::distance(__first, __last);
+    ptrdiff_t __np = _VSTD::distance(__first, __last);
     __node* __st = __start_.get();
     if (__st)
     {
@@ -6008,7 +6021,7 @@
                     __best_state = __s;
                 }
                 __matched = true;
-                if (__highest_j == _Np)
+                if (__highest_j == __np)
                     __states.clear();
                 else
                     __states.pop_back();
@@ -6214,7 +6227,7 @@
     return __r;
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _ST, class _SA, class _Ap, class _Cp, class _Tp>
 bool
 regex_search(const basic_string<_Cp, _ST, _SA>&& __s,
@@ -6277,7 +6290,7 @@
     return _VSTD::regex_match(__s.begin(), __s.end(), __m, __e, __flags);
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _ST, class _SA, class _Allocator, class _CharT, class _Traits>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -6350,7 +6363,7 @@
                    const regex_type& __re,
                    regex_constants::match_flag_type __m
                                               = regex_constants::match_default);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
                    const regex_type&& __re,
                    regex_constants::match_flag_type __m
@@ -6482,7 +6495,7 @@
                          const regex_type& __re, int __submatch = 0,
                          regex_constants::match_flag_type __m =
                                                 regex_constants::match_default);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
                          const regex_type&& __re, int __submatch = 0,
                          regex_constants::match_flag_type __m =
@@ -6493,7 +6506,7 @@
                          const regex_type& __re, const vector<int>& __submatches,
                          regex_constants::match_flag_type __m =
                                                 regex_constants::match_default);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
                          const regex_type&& __re, const vector<int>& __submatches,
                          regex_constants::match_flag_type __m =
@@ -6507,7 +6520,7 @@
                          regex_constants::match_flag_type __m =
                                                 regex_constants::match_default);
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
                          const regex_type&& __re,
                          initializer_list<int> __submatches,
@@ -6522,7 +6535,7 @@
                              const int (&__submatches)[_Np],
                              regex_constants::match_flag_type __m =
                                                 regex_constants::match_default);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <size_t _Np>
         regex_token_iterator(_BidirectionalIterator __a,
                              _BidirectionalIterator __b,
@@ -6844,7 +6857,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _BidirT>
@@ -6866,9 +6879,11 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iosfwd>
 #  include <iterator>
 #  include <new>
+#  include <type_traits>
 #  include <typeinfo>
 #  include <utility>
 #endif
diff --git a/third_party/llvm-project/libcxx/include/scoped_allocator b/third_party/llvm-project/libcxx/include/scoped_allocator
index 461c67e..f6160b5 100644
--- a/third_party/llvm-project/libcxx/include/scoped_allocator
+++ b/third_party/llvm-project/libcxx/include/scoped_allocator
@@ -678,7 +678,7 @@
     template <class...> friend class __scoped_allocator_storage;
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _OuterAlloc, class... _InnerAllocs>
     scoped_allocator_adaptor(_OuterAlloc, _InnerAllocs...)
         -> scoped_allocator_adaptor<_OuterAlloc, _InnerAllocs...>;
diff --git a/third_party/llvm-project/libcxx/include/semaphore b/third_party/llvm-project/libcxx/include/semaphore
index ddccb28..cfbc247 100644
--- a/third_party/llvm-project/libcxx/include/semaphore
+++ b/third_party/llvm-project/libcxx/include/semaphore
@@ -46,12 +46,15 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__atomic/atomic_base.h>
+#include <__atomic/atomic_sync.h>
+#include <__atomic/memory_order.h>
 #include <__availability>
 #include <__chrono/time_point.h>
 #include <__config>
 #include <__thread/timed_backoff_policy.h>
 #include <__threading_support>
-#include <atomic>
+#include <cstddef>
 #include <limits>
 #include <version>
 
@@ -172,11 +175,11 @@
     _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
     bool try_acquire_until(chrono::time_point<Clock, Duration> const& __abs_time)
     {
-        auto const current = Clock::now();
-        if (current >= __abs_time)
+        auto const __current = Clock::now();
+        if (__current >= __abs_time)
             return try_acquire();
         else
-            return try_acquire_for(__abs_time - current);
+            return try_acquire_for(__abs_time - __current);
     }
 };
 
@@ -188,4 +191,8 @@
 
 _LIBCPP_POP_MACROS
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <atomic>
+#endif
+
 #endif //_LIBCPP_SEMAPHORE
diff --git a/third_party/llvm-project/libcxx/include/set b/third_party/llvm-project/libcxx/include/set
index 1154c4e..05bffe6 100644
--- a/third_party/llvm-project/libcxx/include/set
+++ b/third_party/llvm-project/libcxx/include/set
@@ -547,7 +547,7 @@
     typedef _VSTD::reverse_iterator<iterator>       reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __set_node_handle<typename __base::__node, allocator_type> node_type;
     typedef __insert_return_type<iterator, node_type> insert_return_type;
 #endif
@@ -593,7 +593,7 @@
             insert(__f, __l);
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
         template <class _InputIterator>
         _LIBCPP_INLINE_VISIBILITY
         set(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
@@ -650,7 +650,7 @@
             insert(__il.begin(), __il.end());
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     set(initializer_list<value_type> __il, const allocator_type& __a)
         : set(__il, key_compare(), __a) {}
@@ -767,7 +767,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {__tree_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     insert_return_type insert(node_type&& __nh)
     {
@@ -844,7 +844,7 @@
     iterator find(const key_type& __k)             {return __tree_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -858,21 +858,21 @@
     _LIBCPP_INLINE_VISIBILITY
     size_type      count(const key_type& __k) const
         {return __tree_.__count_unique(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
     count(const _K2& __k) const                    {return __tree_.__count_multi(__k);}
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
     contains(const _K2& __k) const { return find(__k) != end(); }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     iterator lower_bound(const key_type& __k)
@@ -880,7 +880,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator lower_bound(const key_type& __k) const
         {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -898,7 +898,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator upper_bound(const key_type& __k) const
         {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -915,7 +915,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
         {return __tree_.__equal_range_unique(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
@@ -1038,7 +1038,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Compare, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
     typename set<_Key, _Compare, _Allocator>::size_type
@@ -1084,7 +1084,7 @@
     typedef _VSTD::reverse_iterator<iterator>       reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __set_node_handle<typename __base::__node, allocator_type> node_type;
 #endif
 
@@ -1121,7 +1121,7 @@
             insert(__f, __l);
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
         template <class _InputIterator>
         _LIBCPP_INLINE_VISIBILITY
         multiset(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
@@ -1186,7 +1186,7 @@
             insert(__il.begin(), __il.end());
         }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     multiset(initializer_list<value_type> __il, const allocator_type& __a)
         : multiset(__il, key_compare(), __a) {}
@@ -1302,7 +1302,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {__tree_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     iterator insert(node_type&& __nh)
     {
@@ -1380,7 +1380,7 @@
     iterator find(const key_type& __k)             {return __tree_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -1394,21 +1394,21 @@
     _LIBCPP_INLINE_VISIBILITY
     size_type      count(const key_type& __k) const
         {return __tree_.__count_multi(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
     count(const _K2& __k) const            {return __tree_.__count_multi(__k);}
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
     contains(const _K2& __k) const { return find(__k) != end(); }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     iterator lower_bound(const key_type& __k)
@@ -1416,7 +1416,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator lower_bound(const key_type& __k) const
             {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -1434,7 +1434,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const_iterator upper_bound(const key_type& __k) const
             {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
@@ -1451,7 +1451,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
             {return __tree_.__equal_range_multi(__k);}
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
@@ -1573,7 +1573,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Compare, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
     typename multiset<_Key, _Compare, _Allocator>::size_type
@@ -1584,7 +1584,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _KeyT, class _CompareT = std::less<_KeyT>>
@@ -1598,8 +1598,10 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_SET
diff --git a/third_party/llvm-project/libcxx/include/shared_mutex b/third_party/llvm-project/libcxx/include/shared_mutex
index 6919898..db35514 100644
--- a/third_party/llvm-project/libcxx/include/shared_mutex
+++ b/third_party/llvm-project/libcxx/include/shared_mutex
@@ -124,16 +124,25 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__availability>
+#include <__chrono/duration.h>
+#include <__chrono/steady_clock.h>
+#include <__chrono/time_point.h>
+#include <__condition_variable/condition_variable.h>
 #include <__config>
+#include <__memory/addressof.h>
+#include <__mutex/mutex.h>
+#include <__mutex/tag_types.h>
+#include <__mutex/unique_lock.h>
+#include <__system_error/system_error.h>
+#include <__utility/swap.h>
+#include <cerrno>
 #include <version>
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
 
-#if _LIBCPP_STD_VER > 11 || defined(_LIBCPP_BUILDING_LIBRARY)
-
-#include <__mutex_base>
+#if _LIBCPP_STD_VER >= 14 || defined(_LIBCPP_BUILDING_LIBRARY)
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -177,7 +186,7 @@
 };
 
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 class _LIBCPP_TYPE_VIS _LIBCPP_AVAILABILITY_SHARED_MUTEX shared_mutex
 {
     __shared_mutex_base __base_;
@@ -293,11 +302,11 @@
     {
         while (true)
         {
-            cv_status status = __base_.__gate1_.wait_until(__lk, __abs_time);
+            cv_status __status = __base_.__gate1_.wait_until(__lk, __abs_time);
             if ((__base_.__state_ & __base_.__write_entered_) == 0 &&
                                        (__base_.__state_ & __base_.__n_readers_) < __base_.__n_readers_)
                 break;
-            if (status == cv_status::timeout)
+            if (__status == cv_status::timeout)
                 return false;
         }
     }
@@ -502,8 +511,12 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP_STD_VER > 11
+#endif // _LIBCPP_STD_VER >= 14
 
 _LIBCPP_POP_MACROS
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <system_error>
+#endif
+
 #endif // _LIBCPP_SHARED_MUTEX
diff --git a/third_party/llvm-project/libcxx/include/source_location b/third_party/llvm-project/libcxx/include/source_location
index 4c4a096..e9e852a 100644
--- a/third_party/llvm-project/libcxx/include/source_location
+++ b/third_party/llvm-project/libcxx/include/source_location
@@ -35,7 +35,8 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location)
+#if _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) &&                                               \
+    !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)
 
 class source_location {
   // The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column
@@ -78,7 +79,8 @@
   }
 };
 
-#endif // _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location)
+#endif // _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) &&
+       // _LIBCPP_APPLE_CLANG_VER <= 1403)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/include/span b/third_party/llvm-project/libcxx/include/span
index 23af04f..2ef1ea6 100644
--- a/third_party/llvm-project/libcxx/include/span
+++ b/third_party/llvm-project/libcxx/include/span
@@ -141,11 +141,14 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/enable_view.h>
 #include <__ranges/size.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <array>        // for array
 #include <cstddef>      // for byte
 #include <limits>
-#include <type_traits>  // for remove_cv, etc
 #include <version>
 
 // standard-mandated includes
@@ -166,7 +169,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _Tp>
 struct __is_std_array : false_type {};
@@ -238,10 +241,12 @@
     template <__span_compatible_iterator<element_type> _It, __span_compatible_sentinel_for<_It> _End>
     _LIBCPP_INLINE_VISIBILITY
     constexpr explicit span(_It __first, _End __last) : __data_{_VSTD::to_address(__first)} {
-      (void)__last;
-      _LIBCPP_ASSERT((__last - __first >= 0), "invalid range in span's constructor (iterator, sentinel)");
-      _LIBCPP_ASSERT(__last - __first == _Extent,
-                     "invalid range in span's constructor (iterator, sentinel): last - first != extent");
+      // [span.cons]/10
+      // Throws: When and what last - first throws.
+      [[maybe_unused]] auto __dist = __last - __first;
+      _LIBCPP_ASSERT(__dist >= 0, "invalid range in span's constructor (iterator, sentinel)");
+      _LIBCPP_ASSERT(
+          __dist == _Extent, "invalid range in span's constructor (iterator, sentinel): last - first != extent");
     }
 
     _LIBCPP_INLINE_VISIBILITY constexpr span(type_identity_t<element_type> (&__arr)[_Extent]) noexcept : __data_{__arr} {}
@@ -566,10 +571,10 @@
 auto as_writable_bytes(span<_Tp, _Extent> __s) noexcept
 { return __s.__as_writable_bytes(); }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template<contiguous_iterator _It, class _EndOrSize>
     span(_It, _EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 template<class _Tp, size_t _Sz>
     span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>;
@@ -583,7 +588,7 @@
 template<ranges::contiguous_range _Range>
     span(_Range&&) -> span<remove_reference_t<ranges::range_reference_t<_Range>>>;
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
@@ -593,6 +598,7 @@
 #  include <concepts>
 #  include <functional>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_SPAN
diff --git a/third_party/llvm-project/libcxx/include/sstream b/third_party/llvm-project/libcxx/include/sstream
index 78cc28a..389bbf6 100644
--- a/third_party/llvm-project/libcxx/include/sstream
+++ b/third_party/llvm-project/libcxx/include/sstream
@@ -541,10 +541,10 @@
         {
             if (!(__mode_ & ios_base::out))
                 return traits_type::eof();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             try
             {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
                 ptrdiff_t __nout = this->pptr()  - this->pbase();
                 ptrdiff_t __hm = __hm_ - this->pbase();
                 __str_.push_back(char_type());
@@ -553,13 +553,13 @@
                 this->setp(__p, __p + __str_.size());
                 this->__pbump(__nout);
                 __hm_ = this->pbase() + __hm;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             }
             catch (...)
             {
                 return traits_type::eof();
             }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         }
         __hm_ = _VSTD::max(this->pptr() + 1, __hm_);
         if (__mode_ & ios_base::in)
diff --git a/third_party/llvm-project/libcxx/include/stack b/third_party/llvm-project/libcxx/include/stack
index d653d1b..318c9c7 100644
--- a/third_party/llvm-project/libcxx/include/stack
+++ b/third_party/llvm-project/libcxx/include/stack
@@ -102,9 +102,9 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__memory/uses_allocator.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
 #include <deque>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -204,7 +204,7 @@
             : c(_VSTD::move(__s.c), __a) {}
 #endif // _LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class _InputIterator,
               class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value>>
     _LIBCPP_HIDE_FROM_ABI
@@ -235,7 +235,7 @@
 
     template <class... _Args>
         _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         decltype(auto) emplace(_Args&&... __args)
         { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
 #else
@@ -268,7 +268,7 @@
     operator< (const stack<T1, _C1>& __x, const stack<T1, _C1>& __y);
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Container,
          class = enable_if_t<!__is_allocator<_Container>::value>
 >
@@ -284,7 +284,7 @@
     -> stack<typename _Container::value_type, _Container>;
 #endif
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template<class _InputIterator,
          class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value>>
 stack(_InputIterator, _InputIterator)
@@ -366,6 +366,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <functional>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_STACK
diff --git a/third_party/llvm-project/libcxx/include/stdatomic.h b/third_party/llvm-project/libcxx/include/stdatomic.h
index ff2a568..9c002e5 100644
--- a/third_party/llvm-project/libcxx/include/stdatomic.h
+++ b/third_party/llvm-project/libcxx/include/stdatomic.h
@@ -121,7 +121,7 @@
 #  pragma GCC system_header
 #endif
 
-#if defined(__cplusplus) && _LIBCPP_STD_VER > 20
+#if defined(__cplusplus) && _LIBCPP_STD_VER >= 23
 
 #include <atomic>
 #include <version>
@@ -230,6 +230,6 @@
 #   include_next <stdatomic.h>
 # endif
 
-#endif // defined(__cplusplus) && _LIBCPP_STD_VER > 20
+#endif // defined(__cplusplus) && _LIBCPP_STD_VER >= 23
 
 #endif // _LIBCPP_STDATOMIC_H
diff --git a/third_party/llvm-project/libcxx/include/stdexcept b/third_party/llvm-project/libcxx/include/stdexcept
index 68de6ce..8e2f985 100644
--- a/third_party/llvm-project/libcxx/include/stdexcept
+++ b/third_party/llvm-project/libcxx/include/stdexcept
@@ -43,8 +43,8 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
-#include <cstdlib>
-#include <exception>
+#include <__exception/exception.h>
+#include <__verbose_abort>
 #include <iosfwd>  // for string forward decl
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -220,91 +220,88 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_logic_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw logic_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("logic_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_domain_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw domain_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("domain_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_invalid_argument(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw invalid_argument(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("invalid_argument was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_length_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw length_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("length_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_out_of_range(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw out_of_range(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("out_of_range was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_range_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw range_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("range_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_overflow_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw overflow_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("overflow_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_underflow_error(const char*__msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw underflow_error(__msg);
 #else
-    ((void)__msg);
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("underflow_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
 _LIBCPP_END_NAMESPACE_STD
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
+#  include <exception>
+#endif
+
 #endif // _LIBCPP_STDEXCEPT
diff --git a/third_party/llvm-project/libcxx/include/string b/third_party/llvm-project/libcxx/include/string
index 9f5838d..1de3fb7 100644
--- a/third_party/llvm-project/libcxx/include/string
+++ b/third_party/llvm-project/libcxx/include/string
@@ -550,6 +550,7 @@
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
 #include <__iterator/wrap_iter.h>
+#include <__memory/addressof.h>
 #include <__memory/allocate_at_least.h>
 #include <__memory/allocator.h>
 #include <__memory/allocator_traits.h>
@@ -561,7 +562,15 @@
 #include <__string/char_traits.h>
 #include <__string/extern_template_lists.h>
 #include <__type_traits/is_allocator.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_nothrow_default_constructible.h>
+#include <__type_traits/is_nothrow_move_assignable.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_standard_layout.h>
+#include <__type_traits/is_trivial.h>
 #include <__type_traits/noexcept_move_assign_container.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/auto_cast.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
@@ -569,12 +578,10 @@
 #include <climits>
 #include <cstdint>
 #include <cstdio>  // EOF
-#include <cstdlib>
 #include <cstring>
 #include <limits>
 #include <stdexcept>
 #include <string_view>
-#include <type_traits>
 #include <version>
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -842,8 +849,23 @@
     __default_init();
   }
 
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const basic_string& __str);
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const basic_string& __str, const allocator_type& __a);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const basic_string& __str)
+      : __r_(__default_init_tag(), __alloc_traits::select_on_container_copy_construction(__str.__alloc())) {
+    if (!__str.__is_long())
+      __r_.first() = __str.__r_.first();
+    else
+      __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
+    std::__debug_db_insert_c(this);
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const basic_string& __str, const allocator_type& __a)
+      : __r_(__default_init_tag(), __a) {
+    if (!__str.__is_long())
+      __r_.first() = __str.__r_.first();
+    else
+      __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
+    std::__debug_db_insert_c(this);
+  }
 
 #ifndef _LIBCPP_CXX03_LANG
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(basic_string&& __str)
@@ -875,7 +897,7 @@
   }
 #endif // _LIBCPP_CXX03_LANG
 
-  template <class = __enable_if_t<__is_allocator<_Allocator>::value, nullptr_t> >
+  template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s)
       : __r_(__default_init_tag(), __default_init_tag()) {
     _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*) detected nullptr");
@@ -883,10 +905,15 @@
     std::__debug_db_insert_c(this);
   }
 
-  template <class = __enable_if_t<__is_allocator<_Allocator>::value, nullptr_t> >
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, const _Allocator& __a);
+  template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, const _Allocator& __a)
+      : __r_(__default_init_tag(), __a) {
+    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*, allocator) detected nullptr");
+    __init(__s, traits_type::length(__s));
+    std::__debug_db_insert_c(this);
+  }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   basic_string(nullptr_t) = delete;
 #endif
 
@@ -911,7 +938,7 @@
     std::__debug_db_insert_c(this);
   }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
   _LIBCPP_HIDE_FROM_ABI constexpr
   basic_string(basic_string&& __str, size_type __pos, const _Allocator& __alloc = _Allocator())
       : basic_string(std::move(__str), __pos, npos, __alloc) {}
@@ -941,11 +968,22 @@
   }
 #endif
 
-  template <class = __enable_if_t<__is_allocator<_Allocator>::value, nullptr_t> >
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c, const _Allocator& __a);
+  template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c, const _Allocator& __a)
+      : __r_(__default_init_tag(), __a) {
+    __init(__n, __c);
+    std::__debug_db_insert_c(this);
+  }
 
   _LIBCPP_CONSTEXPR_SINCE_CXX20
-  basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Allocator& __a = _Allocator());
+  basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Allocator& __a = _Allocator())
+      : __r_(__default_init_tag(), __a) {
+    size_type __str_sz = __str.size();
+    if (__pos > __str_sz)
+      __throw_out_of_range();
+    __init(__str.data() + __pos, std::min(__n, __str_sz - __pos));
+    std::__debug_db_insert_c(this);
+  }
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
   basic_string(const basic_string& __str, size_type __pos, const _Allocator& __a = _Allocator())
@@ -958,31 +996,49 @@
   }
 
   template <class _Tp,
-            class = __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
-                                  !__is_same_uncvref<_Tp, basic_string>::value> >
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
   _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-  basic_string(const _Tp& __t, size_type __pos, size_type __n, const allocator_type& __a = allocator_type());
+  basic_string(const _Tp& __t, size_type __pos, size_type __n, const allocator_type& __a = allocator_type())
+      : __r_(__default_init_tag(), __a) {
+    __self_view __sv0 = __t;
+    __self_view __sv  = __sv0.substr(__pos, __n);
+    __init(__sv.data(), __sv.size());
+    std::__debug_db_insert_c(this);
+  }
 
   template <class _Tp,
-            class = __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
-                                  !__is_same_uncvref<_Tp, basic_string>::value> >
-  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(
-      const _Tp& __t);
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const _Tp& __t)
+      : __r_(__default_init_tag(), __default_init_tag()) {
+    __self_view __sv = __t;
+    __init(__sv.data(), __sv.size());
+    std::__debug_db_insert_c(this);
+  }
 
   template <class _Tp,
-            class = __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
-                                  !__is_same_uncvref<_Tp, basic_string>::value> >
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
   _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(
-      const _Tp& __t, const allocator_type& __a);
+      const _Tp& __t, const allocator_type& __a)
+      : __r_(__default_init_tag(), __a) {
+    __self_view __sv = __t;
+    __init(__sv.data(), __sv.size());
+    std::__debug_db_insert_c(this);
+  }
 
-  template <class _InputIterator, class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value> >
+  template <class _InputIterator, __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, int> = 0>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(_InputIterator __first, _InputIterator __last)
       : __r_(__default_init_tag(), __default_init_tag()) {
     __init(__first, __last);
     std::__debug_db_insert_c(this);
   }
 
-  template <class _InputIterator, class = __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value> >
+  template <class _InputIterator, __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, int> = 0>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
   basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a)
       : __r_(__default_init_tag(), __a) {
@@ -1004,15 +1060,19 @@
   }
 #endif // _LIBCPP_CXX03_LANG
 
-    inline _LIBCPP_CONSTEXPR_SINCE_CXX20 ~basic_string();
+  inline _LIBCPP_CONSTEXPR_SINCE_CXX20 ~basic_string() {
+    std::__debug_db_erase_c(this);
+    if (__is_long())
+      __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
+  }
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     operator __self_view() const _NOEXCEPT { return __self_view(data(), size()); }
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(const basic_string& __str);
 
-    template <class _Tp, class = __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
-                                               !__is_same_uncvref<_Tp, basic_string>::value> >
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                           !__is_same_uncvref<_Tp, basic_string>::value, int> = 0>
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(const _Tp& __t) {
       __self_view __sv = __t;
       return assign(__sv);
@@ -1030,7 +1090,7 @@
 #endif
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     basic_string& operator=(const value_type* __s) {return assign(__s);}
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     basic_string& operator=(nullptr_t) = delete;
 #endif
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(value_type __c);
@@ -1097,7 +1157,7 @@
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20 void reserve(size_type __requested_capacity);
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class _Op>
     _LIBCPP_HIDE_FROM_ABI constexpr
     void resize_and_overwrite(size_type __n, _Op __op) {
@@ -1132,14 +1192,11 @@
         return append(__str);
     }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-            && !__is_same_uncvref<_Tp, basic_string >::value,
-            basic_string&
-        >
+    template <class _Tp,
+              __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                !__is_same_uncvref<_Tp, basic_string >::value,
+                            int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
     operator+=(const _Tp& __t) {
         __self_view __sv = __t; return append(__sv);
     }
@@ -1162,25 +1219,27 @@
         return append(__str.data(), __str.size());
   }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t<
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-            && !__is_same_uncvref<_Tp, basic_string>::value,
-            basic_string&
-        >
-                  append(const _Tp& __t) { __self_view __sv = __t; return append(__sv.data(), __sv.size()); }
+  template <class _Tp,
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  append(const _Tp& __t) {
+        __self_view __sv = __t;
+        return append(__sv.data(), __sv.size());
+  }
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const basic_string& __str, size_type __pos, size_type __n=npos);
 
-    template <class _Tp>
+    template <class _Tp,
+              __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                !__is_same_uncvref<_Tp, basic_string>::value,
+                            int> = 0>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-            && !__is_same_uncvref<_Tp, basic_string>::value,
-            basic_string&
-        >
-                  append(const _Tp& __t, size_type __pos, size_type __n=npos);
+
+        basic_string&
+        append(const _Tp& __t, size_type __pos, size_type __n = npos);
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* __s, size_type __n);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* __s);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(size_type __n, value_type __c);
@@ -1188,27 +1247,16 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     void __append_default_init(size_type __n);
 
-    template<class _InputIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    __enable_if_t
-        <
-            __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-            basic_string&
-        >
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+    template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
     append(_InputIterator __first, _InputIterator __last) {
-      const basic_string __temp(__first, __last, __alloc());
-      append(__temp.data(), __temp.size());
-      return *this;
+        const basic_string __temp(__first, __last, __alloc());
+        append(__temp.data(), __temp.size());
+        return *this;
     }
-    template<class _ForwardIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    __enable_if_t
-        <
-            __is_cpp17_forward_iterator<_ForwardIterator>::value,
-            basic_string&
-        >
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+
+    template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
     append(_ForwardIterator __first, _ForwardIterator __last);
 
 #ifndef _LIBCPP_CXX03_LANG
@@ -1239,14 +1287,13 @@
     return *(data() + size() - 1);
   }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            basic_string&
-        >
-                 assign(const _Tp & __t) { __self_view __sv = __t; return assign(__sv.data(), __sv.size()); }
+  template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  assign(const _Tp& __t) {
+    __self_view __sv = __t;
+    return assign(__sv.data(), __sv.size());
+  }
+
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     basic_string& assign(const basic_string& __str) { return *this = __str; }
 #ifndef _LIBCPP_CXX03_LANG
@@ -1256,34 +1303,25 @@
         {*this = std::move(__str); return *this;}
 #endif
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const basic_string& __str, size_type __pos, size_type __n=npos);
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-            && !__is_same_uncvref<_Tp, basic_string>::value,
-            basic_string&
-        >
-                  assign(const _Tp & __t, size_type __pos, size_type __n=npos);
+
+    template <class _Tp,
+              __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                !__is_same_uncvref<_Tp, basic_string>::value,
+                            int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+    assign(const _Tp& __t, size_type __pos, size_type __n = npos);
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* __s, size_type __n);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* __s);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(size_type __n, value_type __c);
-    template<class _InputIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-            basic_string&
-        >
-        assign(_InputIterator __first, _InputIterator __last);
-    template<class _ForwardIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __is_cpp17_forward_iterator<_ForwardIterator>::value,
-            basic_string&
-        >
-        assign(_ForwardIterator __first, _ForwardIterator __last);
+    template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+    assign(_InputIterator __first, _InputIterator __last);
+
+    template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+    assign(_ForwardIterator __first, _ForwardIterator __last);
+
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     basic_string& assign(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
@@ -1294,30 +1332,26 @@
     return insert(__pos1, __str.data(), __str.size());
   }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            basic_string&
-        >
-                 insert(size_type __pos1, const _Tp& __t)
-    { __self_view __sv = __t; return insert(__pos1, __sv.data(), __sv.size()); }
+  template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  insert(size_type __pos1, const _Tp& __t) {
+    __self_view __sv = __t;
+    return insert(__pos1, __sv.data(), __sv.size());
+  }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string>::value,
-            basic_string&
-        >
-                  insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n=npos);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20
-    basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n=npos);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, size_type __n, value_type __c);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator      insert(const_iterator __pos, value_type __c);
+  template <class _Tp,
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n = npos);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n = npos);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, size_type __n, value_type __c);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator insert(const_iterator __pos, value_type __c);
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
   insert(const_iterator __pos, size_type __n, value_type __c) {
@@ -1328,22 +1362,14 @@
     return begin() + __p;
   }
 
-    template<class _InputIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-            iterator
-        >
-        insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
-    template<class _ForwardIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __is_cpp17_forward_iterator<_ForwardIterator>::value,
-            iterator
-        >
-        insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
+  template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
+  insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
+
+  template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
+  insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
+
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     iterator insert(const_iterator __pos, initializer_list<value_type> __il)
@@ -1361,28 +1387,27 @@
     return replace(__pos1, __n1, __str.data(), __str.size());
   }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            basic_string&
-        >
-                  replace(size_type __pos1, size_type __n1, const _Tp& __t) { __self_view __sv = __t; return replace(__pos1, __n1, __sv.data(), __sv.size()); }
-    _LIBCPP_CONSTEXPR_SINCE_CXX20
-    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2=npos);
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string>::value,
-            basic_string&
-        >
-                  replace(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2=npos);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20
-    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
+  template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(size_type __pos1, size_type __n1, const _Tp& __t) {
+    __self_view __sv = __t;
+    return replace(__pos1, __n1, __sv.data(), __sv.size());
+  }
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos);
+
+  template <class _Tp,
+            __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                              !__is_same_uncvref<_Tp, basic_string>::value,
+                          int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
   replace(const_iterator __i1, const_iterator __i2, const basic_string& __str) {
@@ -1390,14 +1415,12 @@
         static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __str.data(), __str.size());
   }
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            basic_string&
-        >
-                  replace(const_iterator __i1, const_iterator __i2, const _Tp& __t) { __self_view __sv = __t; return replace(__i1 - begin(), __i2 - __i1, __sv); }
+  template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(const_iterator __i1, const_iterator __i2, const _Tp& __t) {
+    __self_view __sv = __t;
+    return replace(__i1 - begin(), __i2 - __i1, __sv);
+  }
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
   replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n) {
@@ -1414,14 +1437,10 @@
     return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c);
   }
 
-    template<class _InputIterator>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __is_cpp17_input_iterator<_InputIterator>::value,
-            basic_string&
-        >
-        replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
+  template <class _InputIterator, __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, int> = 0>
+  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
+  replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
+
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     basic_string& replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il)
@@ -1460,7 +1479,7 @@
     const value_type* c_str() const _NOEXCEPT {return data();}
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     const value_type* data() const _NOEXCEPT  {return std::__to_address(__get_pointer());}
-#if _LIBCPP_STD_VER > 14 || defined(_LIBCPP_BUILDING_LIBRARY)
+#if _LIBCPP_STD_VER >= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     value_type* data()             _NOEXCEPT  {return std::__to_address(__get_pointer());}
 #endif
@@ -1471,16 +1490,11 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              find(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
-    _LIBCPP_CONSTEXPR_SINCE_CXX20
-    size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    find(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
+
+    _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
     _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT;
@@ -1488,14 +1502,10 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              rfind(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    rfind(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1505,14 +1515,10 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              find_first_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    find_first_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1523,14 +1529,10 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              find_last_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    find_last_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1541,14 +1543,10 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              find_first_not_of(const _Tp &__t, size_type __pos = 0) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    find_first_not_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1559,14 +1557,10 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            size_type
-        >
-              find_last_not_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
+    find_last_not_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     size_type find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1577,23 +1571,13 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     int compare(const basic_string& __str) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            int
-        >
-        compare(const _Tp &__t) const _NOEXCEPT;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 int
+    compare(const _Tp& __t) const _NOEXCEPT;
 
-    template <class _Tp>
-    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-            int
-        >
-         compare(size_type __pos1, size_type __n1, const _Tp& __t) const;
+    template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
+    _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 int
+    compare(size_type __pos1, size_type __n1, const _Tp& __t) const;
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     int compare(size_type __pos1, size_type __n1, const basic_string& __str) const;
@@ -1601,20 +1585,19 @@
     int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2,
                 size_type __n2 = npos) const;
 
-    template <class _Tp>
-    inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
-        __enable_if_t
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string>::value,
-            int
-        >
-        compare(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2=npos) const;
+    template <class _Tp,
+              __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                !__is_same_uncvref<_Tp, basic_string>::value,
+                            int> = 0>
+    inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int
+    compare(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos) const;
+
     _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(const value_type* __s) const _NOEXCEPT;
     _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     int compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const;
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     constexpr _LIBCPP_HIDE_FROM_ABI
     bool starts_with(__self_view __sv) const noexcept
     { return __self_view(data(), size()).starts_with(__sv); }
@@ -1640,7 +1623,7 @@
     { return ends_with(__self_view(__s)); }
 #endif
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     constexpr _LIBCPP_HIDE_FROM_ABI
     bool contains(__self_view __sv) const noexcept
     { return __self_view(data(), size()).contains(__sv); }
@@ -1683,7 +1666,7 @@
     }
 
     static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __begin_lifetime(pointer __begin, size_type __n) {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
         if (__libcpp_is_constant_evaluated()) {
             for (size_type __i = 0; __i != __n; ++__i)
                 std::construct_at(std::addressof(__begin[__i]));
@@ -1691,7 +1674,7 @@
 #else
         (void)__begin;
         (void)__n;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
     }
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __default_init() {
@@ -1839,21 +1822,11 @@
     // to only inline the fast path code directly in the ctor.
     _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init_copy_ctor_external(const value_type* __s, size_type __sz);
 
-    template <class _InputIterator>
-    inline _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-    <
-        __is_exactly_cpp17_input_iterator<_InputIterator>::value
-    >
-    __init(_InputIterator __first, _InputIterator __last);
+    template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> = 0>
+    inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_InputIterator __first, _InputIterator __last);
 
-    template <class _ForwardIterator>
-    inline _LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-    <
-        __is_cpp17_forward_iterator<_ForwardIterator>::value
-    >
-    __init(_ForwardIterator __first, _ForwardIterator __last);
+    template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> = 0>
+    inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_ForwardIterator __first, _ForwardIterator __last);
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20
     void __grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
@@ -1918,7 +1891,7 @@
         _NOEXCEPT_(__alloc_traits::is_always_equal::value);
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     void __move_assign(basic_string& __str, true_type)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         _NOEXCEPT;
 #else
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
@@ -2129,44 +2102,6 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(const _CharT* __s, const _Allocator& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*, allocator) detected nullptr");
-    __init(__s, traits_type::length(__s));
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str)
-    : __r_(__default_init_tag(), __alloc_traits::select_on_container_copy_construction(__str.__alloc()))
-{
-    if (!__str.__is_long())
-        __r_.first() = __str.__r_.first();
-    else
-        __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()),
-                                  __str.__get_long_size());
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(
-    const basic_string& __str, const allocator_type& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    if (!__str.__is_long())
-        __r_.first() = __str.__r_.first();
-    else
-        __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()),
-                                  __str.__get_long_size());
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 void basic_string<_CharT, _Traits, _Allocator>::__init_copy_ctor_external(
     const value_type* __s, size_type __sz) {
@@ -2220,81 +2155,18 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class>
+template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> >
 _LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, _CharT __c, const _Allocator& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    __init(__n, __c);
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str,
-                                                        size_type __pos, size_type __n,
-                                                        const _Allocator& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    size_type __str_sz = __str.size();
-    if (__pos > __str_sz)
-        __throw_out_of_range();
-    __init(__str.data() + __pos, std::min(__n, __str_sz - __pos));
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp, class>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(
-             const _Tp& __t, size_type __pos, size_type __n, const allocator_type& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    __self_view __sv0 = __t;
-    __self_view __sv = __sv0.substr(__pos, __n);
-    __init(__sv.data(), __sv.size());
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp, class>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(const _Tp & __t)
-     : __r_(__default_init_tag(), __default_init_tag())
-{
-    __self_view __sv = __t;
-    __init(__sv.data(), __sv.size());
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp, class>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::basic_string(const _Tp & __t, const _Allocator& __a)
-    : __r_(__default_init_tag(), __a)
-{
-    __self_view __sv = __t;
-    __init(__sv.data(), __sv.size());
-    std::__debug_db_insert_c(this);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-template <class _InputIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_exactly_cpp17_input_iterator<_InputIterator>::value
->
-basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
+void basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
 {
     __default_init();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     for (; __first != __last; ++__first)
         push_back(*__first);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -2302,16 +2174,12 @@
             __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _ForwardIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_cpp17_forward_iterator<_ForwardIterator>::value
->
+template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 void
 basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last)
 {
     if (__libcpp_is_constant_evaluated())
@@ -2335,14 +2203,14 @@
         __set_long_size(__sz);
     }
 
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif  // _LIBCPP_NO_EXCEPTIONS
+#endif  // _LIBCPP_HAS_NO_EXCEPTIONS
     for (; __first != __last; ++__first, (void) ++__p)
         traits_type::assign(*__p, *__first);
     traits_type::assign(*__p, value_type());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -2350,16 +2218,7 @@
             __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
         throw;
     }
-#endif  // _LIBCPP_NO_EXCEPTIONS
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-basic_string<_CharT, _Traits, _Allocator>::~basic_string()
-{
-    std::__debug_db_erase_c(this);
-    if (__is_long())
-        __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
+#endif  // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _CharT, class _Traits, class _Allocator>
@@ -2522,7 +2381,7 @@
 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str)
 {
-  if (this != &__str) {
+  if (this != std::addressof(__str)) {
     __copy_assign_alloc(__str);
     if (!__is_long()) {
       if (!__str.__is_long()) {
@@ -2555,7 +2414,7 @@
 inline _LIBCPP_CONSTEXPR_SINCE_CXX20
 void
 basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _NOEXCEPT
 #else
     _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
@@ -2584,13 +2443,8 @@
 #endif
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _InputIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-     __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
+template<class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
 {
     const basic_string __temp(__first, __last, __alloc());
@@ -2599,13 +2453,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _ForwardIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_cpp17_forward_iterator<_ForwardIterator>::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
+template<class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
 {
     size_type __cap = capacity();
@@ -2647,16 +2496,12 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-    && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
-basic_string<_CharT, _Traits, _Allocator>::assign(const _Tp & __t, size_type __pos, size_type __n)
-{
+template <class _Tp,
+          __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                            !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
+                        int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::assign(const _Tp& __t, size_type __pos, size_type __n) {
     __self_view __sv = __t;
     size_type __sz = __sv.size();
     if (__pos > __sz)
@@ -2664,7 +2509,6 @@
     return assign(__sv.data() + __pos, std::min(__n, __sz - __pos));
 }
 
-
 template <class _CharT, class _Traits, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 basic_string<_CharT, _Traits, _Allocator>&
@@ -2786,13 +2630,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _ForwardIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_cpp17_forward_iterator<_ForwardIterator>::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
+template<class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::append(
     _ForwardIterator __first, _ForwardIterator __last)
 {
@@ -2833,15 +2672,12 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-    __enable_if_t
-    <
-        __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
-        basic_string<_CharT, _Traits, _Allocator>&
-    >
-basic_string<_CharT, _Traits, _Allocator>::append(const _Tp & __t, size_type __pos, size_type __n)
-{
+template <class _Tp,
+          __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                            !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
+                        int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::append(const _Tp& __t, size_type __pos, size_type __n) {
     __self_view __sv = __t;
     size_type __sz = __sv.size();
     if (__pos > __sz)
@@ -2933,13 +2769,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _InputIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-   __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-   typename basic_string<_CharT, _Traits, _Allocator>::iterator
->
+template<class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<_InputIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last)
 {
   _LIBCPP_DEBUG_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
@@ -2950,13 +2781,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _ForwardIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_cpp17_forward_iterator<_ForwardIterator>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::iterator
->
+template<class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_ForwardIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last)
 {
     _LIBCPP_DEBUG_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
@@ -2991,16 +2817,12 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
-basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const _Tp& __t,
-                                                  size_type __pos2, size_type __n)
-{
+template <class _Tp,
+          __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                            !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
+                        int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n) {
     __self_view __sv = __t;
     size_type __str_sz = __sv.size();
     if (__pos2 > __str_sz)
@@ -3135,13 +2957,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template<class _InputIterator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __is_cpp17_input_iterator<_InputIterator>::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
+template<class _InputIterator, __enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2,
                                                    _InputIterator __j1, _InputIterator __j2)
 {
@@ -3162,16 +2979,13 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
-    basic_string<_CharT, _Traits, _Allocator>&
->
-basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const _Tp& __t,
-                                                   size_type __pos2, size_type __n2)
-{
+template <class _Tp,
+          __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                            !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
+                        int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::replace(
+    size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2) {
     __self_view __sv = __t;
     size_type __str_sz = __sv.size();
     if (__pos2 > __str_sz)
@@ -3365,23 +3179,23 @@
         }
         else
         {
-        #ifndef _LIBCPP_NO_EXCEPTIONS
+        #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             try
             {
-        #endif // _LIBCPP_NO_EXCEPTIONS
+        #endif // _LIBCPP_HAS_NO_EXCEPTIONS
                 auto __allocation = std::__allocate_at_least(__alloc(), __target_capacity + 1);
                 __new_data = __allocation.ptr;
                 __target_capacity = __allocation.count - 1;
-        #ifndef _LIBCPP_NO_EXCEPTIONS
+        #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             }
             catch (...)
             {
                 return;
             }
-        #else  // _LIBCPP_NO_EXCEPTIONS
+        #else  // _LIBCPP_HAS_NO_EXCEPTIONS
             if (__new_data == nullptr)
                 return;
-        #endif // _LIBCPP_NO_EXCEPTIONS
+        #endif // _LIBCPP_HAS_NO_EXCEPTIONS
         }
         __begin_lifetime(__new_data, __target_capacity + 1);
         __now_long = true;
@@ -3495,13 +3309,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::find(const _Tp &__t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3556,13 +3365,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::rfind(const _Tp& __t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3617,13 +3421,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::find_first_of(const _Tp& __t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3677,13 +3476,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::find_last_of(const _Tp& __t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3737,13 +3531,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const _Tp& __t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3798,13 +3587,8 @@
 }
 
 template<class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    typename basic_string<_CharT, _Traits, _Allocator>::size_type
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const _Tp& __t,
                                                 size_type __pos) const _NOEXCEPT
 {
@@ -3837,13 +3621,8 @@
 // compare
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    int
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 int
 basic_string<_CharT, _Traits, _Allocator>::compare(const _Tp& __t) const _NOEXCEPT
 {
     __self_view __sv = __t;
@@ -3893,13 +3672,8 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
-    int
->
+template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 int
 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                    size_type __n1,
                                                    const _Tp& __t) const
@@ -3919,20 +3693,12 @@
 }
 
 template <class _CharT, class _Traits, class _Allocator>
-template <class _Tp>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t
-<
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
-    && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
-    int
->
-basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
-                                                   size_type __n1,
-                                                   const _Tp& __t,
-                                                   size_type __pos2,
-                                                   size_type __n2) const
-{
+template <class _Tp,
+          __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                            !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
+                        int> >
+_LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare(
+    size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2) const {
     __self_view __sv = __t;
     return __self_view(*this).substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2));
 }
@@ -3982,7 +3748,7 @@
         return false;
     if (data() == nullptr)
         return false;
-    if (data()[size()] != value_type())
+    if (!_Traits::eq(data()[size()], value_type()))
         return false;
     return true;
 }
@@ -4010,7 +3776,7 @@
 operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
            const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
 {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     return basic_string_view<_CharT, _Traits>(__lhs) == basic_string_view<_CharT, _Traits>(__rhs);
 #else
     size_t __lhs_sz = __lhs.size();
@@ -4060,7 +3826,7 @@
 operator==(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
            const _CharT* __rhs) _NOEXCEPT
 {
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     return basic_string_view<_CharT, _Traits>(__lhs) == basic_string_view<_CharT, _Traits>(__rhs);
 #else
     typedef basic_string<_CharT, _Traits, _Allocator> _String;
@@ -4071,7 +3837,7 @@
 #endif
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _CharT, class _Traits, class _Allocator>
 _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(
@@ -4086,7 +3852,7 @@
     return basic_string_view<_CharT, _Traits>(__lhs) <=> basic_string_view<_CharT, _Traits>(__rhs);
 }
 
-#else // _LIBCPP_STD_VER > 17
+#else // _LIBCPP_STD_VER >= 20
 
 template<class _CharT, class _Traits, class _Allocator>
 inline _LIBCPP_HIDE_FROM_ABI
@@ -4230,7 +3996,7 @@
 {
     return !(__lhs < __rhs);
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 // operator +
 
@@ -4445,11 +4211,11 @@
                basic_string<_CharT, _Traits, _Allocator>::npos;
 
 template <class _CharT, class _Allocator>
-struct __string_hash : public __unary_function<basic_string<_CharT, char_traits<_CharT>, _Allocator>, size_t>
-{
-    size_t
-    operator()(const basic_string<_CharT, char_traits<_CharT>, _Allocator>& __val) const _NOEXCEPT
-    { return std::__do_string_hash(__val.data(), __val.data() + __val.size()); }
+struct __string_hash : public __unary_function<basic_string<_CharT, char_traits<_CharT>, _Allocator>, size_t> {
+    _LIBCPP_HIDE_FROM_ABI size_t
+    operator()(const basic_string<_CharT, char_traits<_CharT>, _Allocator>& __val) const _NOEXCEPT {
+        return std::__do_string_hash(__val.data(), __val.data() + __val.size());
+    }
 };
 
 template <class _Allocator>
@@ -4504,7 +4270,7 @@
 getline(basic_istream<_CharT, _Traits>&& __is,
         basic_string<_CharT, _Traits, _Allocator>& __str);
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _CharT, class _Traits, class _Allocator, class _Up>
 inline _LIBCPP_HIDE_FROM_ABI
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
@@ -4562,7 +4328,7 @@
 
 #endif // _LIBCPP_ENABLE_DEBUG_MODE
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 // Literal suffixes for basic_string [basic.string.literals]
 inline namespace literals
 {
@@ -4604,7 +4370,7 @@
   } // namespace string_literals
 } // namespace literals
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <>
 inline constexpr bool __format::__enable_insertable<std::basic_string<char>> = true;
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
@@ -4622,9 +4388,11 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <algorithm>
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iterator>
 #  include <new>
+#  include <type_traits>
 #  include <typeinfo>
 #  include <utility>
 #  include <vector>
diff --git a/third_party/llvm-project/libcxx/include/string_view b/third_party/llvm-project/libcxx/include/string_view
index ea98e38..f8cecfb 100644
--- a/third_party/llvm-project/libcxx/include/string_view
+++ b/third_party/llvm-project/libcxx/include/string_view
@@ -208,6 +208,7 @@
 #include <__functional/hash.h>
 #include <__functional/unary_function.h>
 #include <__fwd/string_view.h>
+#include <__iterator/bounded_iter.h>
 #include <__iterator/concepts.h>
 #include <__iterator/readable_traits.h>
 #include <__iterator/reverse_iterator.h>
@@ -218,10 +219,17 @@
 #include <__ranges/enable_view.h>
 #include <__ranges/size.h>
 #include <__string/char_traits.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_standard_layout.h>
+#include <__type_traits/is_trivial.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
+#include <__type_traits/type_identity.h>
 #include <iosfwd>
 #include <limits>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -265,7 +273,11 @@
     using const_pointer          = const _CharT*;
     using reference              = _CharT&;
     using const_reference        = const _CharT&;
+#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
+    using const_iterator         = __bounded_iter<const_pointer>;
+#else
     using const_iterator         = const_pointer; // See [string.view.iterators]
+#endif
     using iterator               = const_iterator;
     using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
     using reverse_iterator       = const_reverse_iterator;
@@ -293,12 +305,13 @@
     basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
         : __data_(__s), __size_(__len)
     {
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
+    _LIBCPP_ASSERT(__len <= static_cast<size_type>(numeric_limits<difference_type>::max()), "string_view::string_view(_CharT *, size_t): length does not fit in difference_type");
     _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr");
 #endif
     }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <contiguous_iterator _It, sized_sentinel_for<_It> _End>
       requires (is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>)
     constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end)
@@ -306,9 +319,9 @@
     {
       _LIBCPP_ASSERT((__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range");
     }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class _Range>
       requires (
         !is_same_v<remove_cvref_t<_Range>, basic_string_view> &&
@@ -318,20 +331,17 @@
         !is_convertible_v<_Range, const _CharT*> &&
         (!requires(remove_cvref_t<_Range>& __d) {
           __d.operator _VSTD::basic_string_view<_CharT, _Traits>();
-        }) &&
-        (!requires {
-         typename remove_reference_t<_Range>::traits_type;
-        } || is_same_v<typename remove_reference_t<_Range>::traits_type, _Traits>)
+        })
       )
     constexpr explicit _LIBCPP_HIDE_FROM_ABI
     basic_string_view(_Range&& __r) : __data_(ranges::data(__r)), __size_(ranges::size(__r)) {}
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
     basic_string_view(const _CharT* __s)
         : __data_(__s), __size_(_VSTD::__char_traits_length_checked<_Traits>(__s)) {}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     basic_string_view(nullptr_t) = delete;
 #endif
 
@@ -343,10 +353,22 @@
     const_iterator end()    const _NOEXCEPT { return cend(); }
 
     _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
-    const_iterator cbegin() const _NOEXCEPT { return __data_; }
+    const_iterator cbegin() const _NOEXCEPT {
+#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
+        return std::__make_bounded_iter(data(), data(), data() + size());
+#else
+        return __data_;
+#endif
+    }
 
     _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
-    const_iterator cend()   const _NOEXCEPT { return __data_ + __size_; }
+    const_iterator cend()   const _NOEXCEPT {
+#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
+        return std::__make_bounded_iter(data() + size(), data(), data() + size());
+#else
+        return __data_ + __size_;
+#endif
+    }
 
     _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_INLINE_VISIBILITY
     const_reverse_iterator rbegin()   const _NOEXCEPT { return const_reverse_iterator(cend()); }
@@ -674,7 +696,7 @@
             (data(), size(), __s, __pos, traits_type::length(__s));
     }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     constexpr _LIBCPP_INLINE_VISIBILITY
     bool starts_with(basic_string_view __s) const noexcept
     { return size() >= __s.size() && compare(0, __s.size(), __s) == 0; }
@@ -700,7 +722,7 @@
     { return ends_with(basic_string_view(__s)); }
 #endif
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     constexpr _LIBCPP_INLINE_VISIBILITY
     bool contains(basic_string_view __sv) const noexcept
     { return find(__sv) != npos; }
@@ -720,23 +742,23 @@
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view);
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _CharT, class _Traits>
 inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true;
 
 template <class _CharT, class _Traits>
 inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 // [string.view.deduct]
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <contiguous_iterator _It, sized_sentinel_for<_It> _End>
   basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <ranges::contiguous_range _Range>
   basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>;
 #endif
@@ -773,11 +795,11 @@
     if (__lhs.size() != __rhs.size()) return false;
     return __lhs.compare(__rhs) == 0;
 }
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 // operator <=>
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 template <class _CharT, class _Traits>
 _LIBCPP_HIDE_FROM_ABI constexpr auto
@@ -807,7 +829,7 @@
     }
 }
 
-#else //  _LIBCPP_STD_VER > 17
+#else //  _LIBCPP_STD_VER >= 20
 
 // operator !=
 template<class _CharT, class _Traits>
@@ -940,7 +962,7 @@
     return __lhs.compare(__rhs) >= 0;
 }
 
-#endif //  _LIBCPP_STD_VER > 17
+#endif //  _LIBCPP_STD_VER >= 20
 
 template<class _CharT, class _Traits>
 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
@@ -976,7 +998,7 @@
 struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {};
 #endif
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 inline namespace literals
 {
   inline namespace string_view_literals
@@ -1024,8 +1046,10 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <algorithm>
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_STRING_VIEW
diff --git a/third_party/llvm-project/libcxx/include/system_error b/third_party/llvm-project/libcxx/include/system_error
index 9891992..a60c984 100644
--- a/third_party/llvm-project/libcxx/include/system_error
+++ b/third_party/llvm-project/libcxx/include/system_error
@@ -146,13 +146,11 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
-#include <__errc>
-#include <__functional/hash.h>
-#include <__functional/unary_function.h>
-#include <__memory/addressof.h>
-#include <stdexcept>
-#include <string>
-#include <type_traits>
+#include <__system_error/errc.h>
+#include <__system_error/error_category.h>
+#include <__system_error/error_code.h>
+#include <__system_error/error_condition.h>
+#include <__system_error/system_error.h>
 #include <version>
 
 // standard-mandated includes
@@ -164,385 +162,11 @@
 #  pragma GCC system_header
 #endif
 
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-// is_error_code_enum
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS is_error_code_enum
-    : public false_type {};
-
-#if _LIBCPP_STD_VER > 14
-template <class _Tp>
-inline constexpr bool is_error_code_enum_v = is_error_code_enum<_Tp>::value;
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdint>
+#  include <cstring>
+#  include <limits>
+#  include <type_traits>
 #endif
 
-// is_error_condition_enum
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum
-    : public false_type {};
-
-#if _LIBCPP_STD_VER > 14
-template <class _Tp>
-inline constexpr bool is_error_condition_enum_v = is_error_condition_enum<_Tp>::value;
-#endif
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc>
-    : true_type { };
-
-#ifdef _LIBCPP_CXX03_LANG
-template <>
-struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx>
-    : true_type { };
-#endif
-
-class _LIBCPP_TYPE_VIS error_condition;
-class _LIBCPP_TYPE_VIS error_code;
-
-// class error_category
-
-class _LIBCPP_HIDDEN __do_message;
-
-class _LIBCPP_TYPE_VIS error_category
-{
-public:
-    virtual ~error_category() _NOEXCEPT;
-
-#if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS)
-    error_category() noexcept;
-#else
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR_SINCE_CXX14 error_category() _NOEXCEPT = default;
-#endif
-    error_category(const error_category&) = delete;
-    error_category& operator=(const error_category&) = delete;
-
-    virtual const char* name() const _NOEXCEPT = 0;
-    virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
-    virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
-    virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
-    virtual string message(int __ev) const = 0;
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool operator==(const error_category& __rhs) const _NOEXCEPT {return this == &__rhs;}
-
-#if _LIBCPP_STD_VER > 17
-
-    _LIBCPP_HIDE_FROM_ABI
-    strong_ordering operator<=>(const error_category& __rhs) const noexcept {return compare_three_way()(this, std::addressof(__rhs));}
-
-#else // _LIBCPP_STD_VER > 17
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool operator!=(const error_category& __rhs) const _NOEXCEPT {return !(*this == __rhs);}
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool operator< (const error_category& __rhs) const _NOEXCEPT {return this < &__rhs;}
-
-#endif // _LIBCPP_STD_VER > 17
-
-    friend class _LIBCPP_HIDDEN __do_message;
-};
-
-class _LIBCPP_HIDDEN __do_message
-    : public error_category
-{
-public:
-    string message(int __ev) const override;
-};
-
-_LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
-_LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;
-
-namespace __adl_only {
-    // Those cause ADL to trigger but they are not viable candidates,
-    // so they are never actually selected.
-    void make_error_condition() = delete;
-    void make_error_code() = delete;
-} // namespace __adl_only
-
-class _LIBCPP_TYPE_VIS error_condition
-{
-    int __val_;
-    const error_category* __cat_;
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    error_condition(int __val, const error_category& __cat) _NOEXCEPT
-        : __val_(__val), __cat_(&__cat) {}
-
-    template <class _Ep>
-        _LIBCPP_INLINE_VISIBILITY
-        error_condition(_Ep __e,
-              typename enable_if<is_error_condition_enum<_Ep>::value>::type* = nullptr
-                                                                     ) _NOEXCEPT
-            {
-                using __adl_only::make_error_condition;
-                *this = make_error_condition(__e);
-            }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void assign(int __val, const error_category& __cat) _NOEXCEPT
-    {
-        __val_ = __val;
-        __cat_ = &__cat;
-    }
-
-    template <class _Ep>
-        _LIBCPP_INLINE_VISIBILITY
-        typename enable_if
-        <
-            is_error_condition_enum<_Ep>::value,
-            error_condition&
-        >::type
-        operator=(_Ep __e) _NOEXCEPT
-            {
-                using __adl_only::make_error_condition;
-                *this = make_error_condition(__e);
-                return *this;
-            }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void clear() _NOEXCEPT
-    {
-        __val_ = 0;
-        __cat_ = &generic_category();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    int value() const _NOEXCEPT {return __val_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    const error_category& category() const _NOEXCEPT {return *__cat_;}
-    string message() const;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit operator bool() const _NOEXCEPT {return __val_ != 0;}
-};
-
-inline _LIBCPP_INLINE_VISIBILITY
-error_condition
-make_error_condition(errc __e) _NOEXCEPT
-{
-    return error_condition(static_cast<int>(__e), generic_category());
-}
-
-// error_code
-
-class _LIBCPP_TYPE_VIS error_code
-{
-    int __val_;
-    const error_category* __cat_;
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    error_code(int __val, const error_category& __cat) _NOEXCEPT
-        : __val_(__val), __cat_(&__cat) {}
-
-    template <class _Ep>
-        _LIBCPP_INLINE_VISIBILITY
-        error_code(_Ep __e,
-                   typename enable_if<is_error_code_enum<_Ep>::value>::type* = nullptr
-                                                                     ) _NOEXCEPT
-            {
-                using __adl_only::make_error_code;
-                *this = make_error_code(__e);
-            }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void assign(int __val, const error_category& __cat) _NOEXCEPT
-    {
-        __val_ = __val;
-        __cat_ = &__cat;
-    }
-
-    template <class _Ep>
-        _LIBCPP_INLINE_VISIBILITY
-        typename enable_if
-        <
-            is_error_code_enum<_Ep>::value,
-            error_code&
-        >::type
-        operator=(_Ep __e) _NOEXCEPT
-            {
-                using __adl_only::make_error_code;
-                *this = make_error_code(__e);
-                return *this;
-            }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void clear() _NOEXCEPT
-    {
-        __val_ = 0;
-        __cat_ = &system_category();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    int value() const _NOEXCEPT {return __val_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    const error_category& category() const _NOEXCEPT {return *__cat_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    error_condition default_error_condition() const _NOEXCEPT
-        {return __cat_->default_error_condition(__val_);}
-
-    string message() const;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit operator bool() const _NOEXCEPT {return __val_ != 0;}
-};
-
-inline _LIBCPP_INLINE_VISIBILITY
-error_code
-make_error_code(errc __e) _NOEXCEPT
-{
-    return error_code(static_cast<int>(__e), generic_category());
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const error_code& __x, const error_code& __y) _NOEXCEPT
-{
-    return __x.category() == __y.category() && __x.value() == __y.value();
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT
-{
-    return __x.category().equivalent(__x.value(), __y)
-        || __y.category().equivalent(__x, __y.value());
-}
-
-#if _LIBCPP_STD_VER <= 17
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT
-{
-    return __y == __x;
-}
-#endif
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT
-{
-    return __x.category() == __y.category() && __x.value() == __y.value();
-}
-
-#if _LIBCPP_STD_VER <= 17
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
-{return !(__x == __y);}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT
-{return !(__x == __y);}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT
-{return !(__x == __y);}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
-{return !(__x == __y);}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT
-{
-    return __x.category() < __y.category()
-        || (__x.category() == __y.category() && __x.value() < __y.value());
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator<(const error_code& __x, const error_code& __y) _NOEXCEPT
-{
-    return __x.category() < __y.category()
-        || (__x.category() == __y.category() && __x.value() < __y.value());
-}
-
-#else // _LIBCPP_STD_VER <= 17
-
-inline _LIBCPP_HIDE_FROM_ABI strong_ordering
-operator<=>(const error_code& __x, const error_code& __y) noexcept
-{
-    if (auto __c = __x.category() <=> __y.category(); __c != 0)
-        return __c;
-    return __x.value() <=> __y.value();
-}
-
-inline _LIBCPP_HIDE_FROM_ABI strong_ordering
-operator<=>(const error_condition& __x, const error_condition& __y) noexcept
-{
-    if (auto __c = __x.category() <=> __y.category(); __c != 0)
-       return __c;
-    return __x.value() <=> __y.value();
-}
-
-#endif // _LIBCPP_STD_VER <= 17
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<error_code>
-    : public __unary_function<error_code, size_t>
-{
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(const error_code& __ec) const _NOEXCEPT
-    {
-        return static_cast<size_t>(__ec.value());
-    }
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<error_condition>
-    : public __unary_function<error_condition, size_t>
-{
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(const error_condition& __ec) const _NOEXCEPT
-    {
-        return static_cast<size_t>(__ec.value());
-    }
-};
-
-// system_error
-
-class _LIBCPP_TYPE_VIS system_error
-    : public runtime_error
-{
-    error_code __ec_;
-public:
-    system_error(error_code __ec, const string& __what_arg);
-    system_error(error_code __ec, const char* __what_arg);
-    system_error(error_code __ec);
-    system_error(int __ev, const error_category& __ecat, const string& __what_arg);
-    system_error(int __ev, const error_category& __ecat, const char* __what_arg);
-    system_error(int __ev, const error_category& __ecat);
-    system_error(const system_error&) _NOEXCEPT = default;
-    ~system_error() _NOEXCEPT override;
-
-    _LIBCPP_INLINE_VISIBILITY
-    const error_code& code() const _NOEXCEPT {return __ec_;}
-
-private:
-    static string __init(const error_code&, string);
-};
-
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS
-void __throw_system_error(int __ev, const char* __what_arg);
-
-_LIBCPP_END_NAMESPACE_STD
-
 #endif // _LIBCPP_SYSTEM_ERROR
diff --git a/third_party/llvm-project/libcxx/include/thread b/third_party/llvm-project/libcxx/include/thread
index 7a1117f..e071476 100644
--- a/third_party/llvm-project/libcxx/include/thread
+++ b/third_party/llvm-project/libcxx/include/thread
@@ -64,6 +64,9 @@
 basic_ostream<charT, traits>&
 operator<<(basic_ostream<charT, traits>& out, thread::id id);
 
+template<class charT>
+struct formatter<thread::id, charT>;
+
 namespace this_thread
 {
 
@@ -84,19 +87,33 @@
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__availability>
+#include <__chrono/steady_clock.h>
+#include <__chrono/time_point.h>
+#include <__concepts/arithmetic.h>
+#include <__condition_variable/condition_variable.h>
 #include <__config>
+#include <__exception/terminate.h>
+#include <__format/concepts.h>
+#include <__format/format_parse_context.h>
+#include <__format/formatter.h>
+#include <__format/formatter_integral.h>
+#include <__format/parser_std_format_spec.h>
 #include <__functional/hash.h>
+#include <__functional/unary_function.h>
+#include <__memory/addressof.h>
 #include <__memory/unique_ptr.h>
-#include <__mutex_base>
+#include <__mutex/mutex.h>
+#include <__mutex/unique_lock.h>
+#include <__system_error/system_error.h>
 #include <__thread/poll_with_backoff.h>
 #include <__thread/timed_backoff_policy.h>
 #include <__threading_support>
 #include <__utility/forward.h>
 #include <cstddef>
+#include <cstdint>
 #include <iosfwd>
-#include <system_error>
 #include <tuple>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -219,6 +236,45 @@
 operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id)
 {return __os << __id.__id_;}
 
+#if _LIBCPP_STD_VER >= 23
+template <__fmt_char_type _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<__thread_id, _CharT> {
+  public:
+    _LIBCPP_HIDE_FROM_ABI constexpr auto parse(basic_format_parse_context<_CharT>& __parse_ctx)
+        -> decltype(__parse_ctx.begin()) {
+        return __parser_.__parse(__parse_ctx, __format_spec::__fields_fill_align_width);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI auto format(__thread_id __id, auto& __ctx) const -> decltype(__ctx.out()) {
+        // In __threading_support __libcpp_thread_id is either a
+        // unsigned long long or a pthread_t.
+        //
+        // The type of pthread_t is left unspecified in POSIX so it can be any
+        // type. The most logical types are an integral or pointer.
+        // On Linux systems pthread_t is an unsigned long long.
+        // On Apple systems pthread_t is a pointer type.
+        //
+        // Note the output should match what the stream operator does. Since
+        // the ostream operator has been shipped years before this formatter
+        // was added to the Standard, this formatter does what the stream
+        // operator does. This may require platform specific changes.
+
+        using _Tp = decltype(__get_underlying_id(__id));
+        using _Cp = conditional_t<integral<_Tp>, _Tp, conditional_t<is_pointer_v<_Tp>, uintptr_t, void>>;
+        static_assert(!is_same_v<_Cp, void>, "unsupported thread::id type, please file a bug report");
+
+        __format_spec::__parsed_specifications<_CharT> __specs = __parser_.__get_parsed_std_specifications(__ctx);
+        if constexpr (is_pointer_v<_Tp>) {
+          __specs.__std_.__alternate_form_ = true;
+          __specs.__std_.__type_           = __format_spec::__type::__hexadecimal_lower_case;
+        }
+        return __formatter::__format_integer(reinterpret_cast<_Cp>(__get_underlying_id(__id)), __ctx, __specs);
+    }
+
+    __format_spec::__parser<_CharT> __parser_{.__alignment_ = __format_spec::__alignment::__right};
+};
+#endif // _LIBCPP_STD_VER >= 23
+
 class _LIBCPP_TYPE_VIS thread
 {
     __libcpp_thread_t __t_;
@@ -301,7 +357,7 @@
 {
     typedef unique_ptr<__thread_struct> _TSPtr;
     _TSPtr __tsp(new __thread_struct);
-    typedef tuple<_TSPtr, typename decay<_Fp>::type, typename decay<_Args>::type...> _Gp;
+    typedef tuple<_TSPtr, __decay_t<_Fp>, __decay_t<_Args>...> _Gp;
     unique_ptr<_Gp> __p(
             new _Gp(_VSTD::move(__tsp),
                     _VSTD::forward<_Fp>(__f),
@@ -367,10 +423,10 @@
         // The standard guarantees a 64bit signed integer resolution for nanoseconds,
         // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits>
         // and issues with long double folding on PowerPC with GCC.
-        _LIBCPP_CONSTEXPR chrono::duration<long double> _Max =
+        _LIBCPP_CONSTEXPR chrono::duration<long double> __max =
             chrono::duration<long double>(9223372036.0L);
         chrono::nanoseconds __ns;
-        if (__d < _Max)
+        if (__d < __max)
         {
             __ns = chrono::duration_cast<chrono::nanoseconds>(__d);
             if (__ns < __d)
@@ -415,7 +471,10 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstring>
 #  include <functional>
+#  include <new>
+#  include <system_error>
 #endif
 
 #endif // _LIBCPP_THREAD
diff --git a/third_party/llvm-project/libcxx/include/tuple b/third_party/llvm-project/libcxx/include/tuple
index b0616bd..abfd441 100644
--- a/third_party/llvm-project/libcxx/include/tuple
+++ b/third_party/llvm-project/libcxx/include/tuple
@@ -865,7 +865,7 @@
         : __base_(allocator_arg_t(), __a, __t)
     { }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     // tuple(tuple<U...>&) constructors (including allocator_arg_t variants)
 
     template <class... _Up, enable_if_t<
@@ -879,7 +879,7 @@
     _LIBCPP_HIDE_FROM_ABI constexpr
         explicit(!(is_convertible_v<_Up&, _Tp> && ...))
     tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) : __base_(allocator_arg_t(), __alloc, __t) {}
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants)
 
@@ -929,7 +929,7 @@
         : __base_(allocator_arg_t(), __a, _VSTD::move(__t))
     { }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants)
 
     template <class... _Up, enable_if_t<
@@ -944,7 +944,7 @@
         explicit(!(is_convertible_v<const _Up&&, _Tp> && ...))
     tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t)
         : __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants)
 
@@ -1018,7 +1018,7 @@
         : __base_(allocator_arg_t(), __a, __p)
     { }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants)
 
     template <class _U1, class _U2, enable_if_t<
@@ -1082,7 +1082,7 @@
         : __base_(allocator_arg_t(), __a, _VSTD::move(__p))
     { }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants)
 
     template <class _U1, class _U2, enable_if_t<
@@ -1097,7 +1097,7 @@
         explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
     tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p)
         : __base_(allocator_arg_t(), __alloc, std::move(__p)) {}
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     // [tuple.assign]
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
@@ -1109,7 +1109,7 @@
         return *this;
     }
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr
     const tuple& operator=(tuple const& __tuple) const
       requires (_And<is_copy_assignable<const _Tp>...>::value) {
@@ -1126,7 +1126,7 @@
                                          typename __make_tuple_indices<sizeof...(_Tp)>::type());
         return *this;
     }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
     tuple& operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple)
@@ -1170,7 +1170,7 @@
     }
 
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class... _UTypes, enable_if_t<
         _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
              is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr>
@@ -1193,7 +1193,7 @@
                                          typename __make_tuple_indices<sizeof...(_Tp)>::type());
         return *this;
     }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     template <template<class...> class Pred, bool _Const,
               class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple>
@@ -1212,7 +1212,7 @@
     template <bool _Const, class _Pair>
     struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {};
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     template <class _U1, class _U2, enable_if_t<
         _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr>
     _LIBCPP_HIDE_FROM_ABI constexpr
@@ -1232,7 +1232,7 @@
         std::get<1>(*this) = std::move(__pair.second);
         return *this;
     }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
     template<class _Up1, class _Up2, __enable_if_t<
         _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value
@@ -1296,12 +1296,12 @@
     void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
         {__base_.swap(__t.__base_);}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr
     void swap(const tuple& __t) const noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) {
         __base_.swap(__t.__base_);
     }
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 };
 
 template <>
@@ -1324,12 +1324,12 @@
         tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
     void swap(tuple&) _NOEXCEPT {}
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
     _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {}
 #endif
 };
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class... _TTypes, class... _UTypes, template<class> class _TQual, template<class> class _UQual>
     requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; }
 struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> {
@@ -1341,9 +1341,9 @@
 struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> {
     using type = tuple<common_type_t<_TTypes, _UTypes>...>;
 };
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class ..._Tp>
 tuple(_Tp...) -> tuple<_Tp...>;
 template <class _Tp1, class _Tp2>
@@ -1363,7 +1363,7 @@
                  _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
     {__t.swap(__u);}
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class... _Tp>
 _LIBCPP_HIDE_FROM_ABI constexpr
 enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void>
@@ -1413,7 +1413,7 @@
              static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get());
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 
 namespace __find_detail {
 
@@ -1552,7 +1552,7 @@
     return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 // operator<=>
 
@@ -1574,7 +1574,7 @@
     return _VSTD::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{});
 }
 
-#else // _LIBCPP_STD_VER > 17
+#else // _LIBCPP_STD_VER >= 20
 
 template <class ..._Tp, class ..._Up>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
@@ -1644,7 +1644,7 @@
     return !(__y < __x);
 }
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
 // tuple_cat
 
@@ -1803,7 +1803,7 @@
 {
 }
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template <class _Tp>
 inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
 
@@ -1845,7 +1845,7 @@
 
 #undef _LIBCPP_NOEXCEPT_RETURN
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 #endif // !defined(_LIBCPP_CXX03_LANG)
 
diff --git a/third_party/llvm-project/libcxx/include/typeindex b/third_party/llvm-project/libcxx/include/typeindex
index e3132c8..251aa43 100644
--- a/third_party/llvm-project/libcxx/include/typeindex
+++ b/third_party/llvm-project/libcxx/include/typeindex
@@ -87,7 +87,7 @@
     _LIBCPP_INLINE_VISIBILITY
     bool operator>=(const type_index& __y) const _NOEXCEPT
         {return !__t_->before(*__y.__t_);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_HIDE_FROM_ABI
     strong_ordering operator<=>(const type_index& __y) const noexcept {
       if (*__t_ == *__y.__t_)
diff --git a/third_party/llvm-project/libcxx/include/typeinfo b/third_party/llvm-project/libcxx/include/typeinfo
index 4431039..4691765 100644
--- a/third_party/llvm-project/libcxx/include/typeinfo
+++ b/third_party/llvm-project/libcxx/include/typeinfo
@@ -21,7 +21,7 @@
 public:
     virtual ~type_info();
 
-    bool operator==(const type_info& rhs) const noexcept;
+    bool operator==(const type_info& rhs) const noexcept; // constexpr since C++23
     bool operator!=(const type_info& rhs) const noexcept; // removed in C++20
 
     bool before(const type_info& rhs) const noexcept;
@@ -59,11 +59,11 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__availability>
 #include <__config>
+#include <__exception/exception.h>
+#include <__type_traits/is_constant_evaluated.h>
+#include <__verbose_abort>
 #include <cstddef>
 #include <cstdint>
-#include <cstdlib>
-#include <exception>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -104,8 +104,13 @@
 
     size_t hash_code() const _NOEXCEPT;
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX23
     bool operator==(const type_info& __arg) const _NOEXCEPT {
+      // When evaluated in a constant expression, both type infos simply can't come
+      // from different translation units, so it is sufficient to compare their addresses.
+      if (__libcpp_is_constant_evaluated()) {
+        return this == &__arg;
+      }
       return __compare(__arg) == 0;
     }
 
@@ -330,9 +335,14 @@
       return __impl::__hash(__type_name);
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX23
     bool operator==(const type_info& __arg) const _NOEXCEPT
     {
+      // When evaluated in a constant expression, both type infos simply can't come
+      // from different translation units, so it is sufficient to compare their addresses.
+      if (__libcpp_is_constant_evaluated()) {
+        return this == &__arg;
+      }
       return __impl::__eq(__type_name, __arg.__type_name);
     }
 
@@ -395,12 +405,18 @@
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_cast()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_cast();
 #else
-    _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_cast was thrown in -fno-exceptions mode");
 #endif
 }
 _LIBCPP_END_NAMESPACE_STD
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <cstdlib>
+#  include <exception>
+#  include <type_traits>
+#endif
+
 #endif // __LIBCPP_TYPEINFO
diff --git a/third_party/llvm-project/libcxx/include/unordered_map b/third_party/llvm-project/libcxx/include/unordered_map
index 14f93ba..238aa44 100644
--- a/third_party/llvm-project/libcxx/include/unordered_map
+++ b/third_party/llvm-project/libcxx/include/unordered_map
@@ -575,7 +575,7 @@
     _LIBCPP_INLINE_VISIBILITY
     size_t operator()(const _Key& __x) const
         {return static_cast<const _Hash&>(*this)(__x);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     size_t operator()(const _K2& __x) const
@@ -611,7 +611,7 @@
     _LIBCPP_INLINE_VISIBILITY
     size_t operator()(const _Key& __x) const
         {return __hash_(__x);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     size_t operator()(const _K2& __x) const
@@ -661,7 +661,7 @@
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _Key& __x, const _Cp& __y) const
         {return static_cast<const _Pred&>(*this)(__x, __y.__get_value().first);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _Cp& __x, const _K2& __y) const
@@ -712,7 +712,7 @@
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _Key& __x, const _Cp& __y) const
         {return __pred_(__x, __y.__get_value().first);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <typename _K2>
     _LIBCPP_INLINE_VISIBILITY
     bool operator()(const _Cp& __x, const _K2& __y) const
@@ -825,7 +825,7 @@
     _LIBCPP_INLINE_VISIBILITY
     value_type& __get_value()
     {
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         return *_VSTD::launder(_VSTD::addressof(__cc_));
 #else
         return __cc_;
@@ -835,7 +835,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const value_type& __get_value() const
     {
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         return *_VSTD::launder(_VSTD::addressof(__cc_));
 #else
         return __cc_;
@@ -1035,7 +1035,7 @@
     typedef value_type&                                    reference;
     typedef const value_type&                              const_reference;
     static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");
+                  "Allocator::value_type must be same type as value_type");
 
 private:
     typedef __hash_value_type<key_type, mapped_type>                          __value_type;
@@ -1075,7 +1075,7 @@
     typedef __hash_map_iterator<typename __table::local_iterator> local_iterator;
     typedef __hash_map_const_iterator<typename __table::const_local_iterator> const_local_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __map_node_handle<__node, allocator_type> node_type;
     typedef __insert_return_type<iterator, node_type> insert_return_type;
 #endif
@@ -1123,7 +1123,7 @@
                   const hasher& __hf, const key_equal& __eql,
                   const allocator_type& __a);
 #endif // _LIBCPP_CXX03_LANG
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     unordered_map(size_type __n, const allocator_type& __a)
       : unordered_map(__n, hasher(), key_equal(), __a) {}
@@ -1270,7 +1270,7 @@
 
 #endif // _LIBCPP_CXX03_LANG
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     template <class... _Args>
         _LIBCPP_INLINE_VISIBILITY
         pair<iterator, bool> try_emplace(const key_type& __k, _Args&&... __args)
@@ -1350,7 +1350,7 @@
         // FIXME: Add debug mode checking for the iterator input
         return insert_or_assign(_VSTD::move(__k), _VSTD::forward<_Vp>(__v)).first;
      }
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
     _LIBCPP_INLINE_VISIBILITY
     iterator erase(const_iterator __p) {return __table_.erase(__p.__i_);}
@@ -1364,7 +1364,7 @@
     _LIBCPP_INLINE_VISIBILITY
         void clear() _NOEXCEPT {__table_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     insert_return_type insert(node_type&& __nh)
     {
@@ -1443,31 +1443,31 @@
     iterator       find(const key_type& __k)       {return __table_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __table_.find(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     iterator       find(const _K2& __k)            {return __table_.find(__k);}
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const _K2& __k) const      {return __table_.find(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const key_type& __k) const {return __table_.__count_unique(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const _K2& __k) const      {return __table_.__count_unique(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
 
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const _K2& __k) const      {return find(__k) != end();}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const key_type& __k)
@@ -1475,7 +1475,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
         {return __table_.__equal_range_unique(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const _K2& __k)
@@ -1484,7 +1484,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const _K2& __k) const
         {return __table_.__equal_range_unique(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     mapped_type& operator[](const key_type& __k);
 #ifndef _LIBCPP_CXX03_LANG
@@ -1874,7 +1874,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1928,7 +1928,7 @@
     typedef value_type&                                    reference;
     typedef const value_type&                              const_reference;
     static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");
+                  "Allocator::value_type must be same type as value_type");
 
 private:
     typedef __hash_value_type<key_type, mapped_type>                          __value_type;
@@ -1967,7 +1967,7 @@
     typedef __hash_map_iterator<typename __table::local_iterator> local_iterator;
     typedef __hash_map_const_iterator<typename __table::const_local_iterator> const_local_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __map_node_handle<__node, allocator_type> node_type;
 #endif
 
@@ -2015,7 +2015,7 @@
                        const hasher& __hf, const key_equal& __eql,
                        const allocator_type& __a);
 #endif // _LIBCPP_CXX03_LANG
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_INLINE_VISIBILITY
     unordered_multimap(size_type __n, const allocator_type& __a)
       : unordered_multimap(__n, hasher(), key_equal(), __a) {}
@@ -2151,7 +2151,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {__table_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     iterator insert(node_type&& __nh)
     {
@@ -2230,31 +2230,31 @@
     iterator       find(const key_type& __k)       {return __table_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __table_.find(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     iterator       find(const _K2& __k)            {return __table_.find(__k);}
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const _K2& __k) const      {return __table_.find(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const key_type& __k) const {return __table_.__count_multi(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const _K2& __k) const      {return __table_.__count_multi(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
 
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const _K2& __k) const      {return find(__k) != end();}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const key_type& __k)
@@ -2262,7 +2262,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
         {return __table_.__equal_range_multi(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const _K2& __k)
@@ -2271,7 +2271,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const _K2& __k) const
         {return __table_.__equal_range_multi(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type bucket_count() const _NOEXCEPT {return __table_.bucket_count();}
@@ -2584,7 +2584,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -2629,7 +2629,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _KeyT, class _ValueT, class _HashT = std::hash<_KeyT>, class _PredT = std::equal_to<_KeyT>>
@@ -2647,7 +2647,9 @@
 #  include <algorithm>
 #  include <bit>
 #  include <concepts>
+#  include <cstdlib>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_UNORDERED_MAP
diff --git a/third_party/llvm-project/libcxx/include/unordered_set b/third_party/llvm-project/libcxx/include/unordered_set
index b4203c0..a6afb74 100644
--- a/third_party/llvm-project/libcxx/include/unordered_set
+++ b/third_party/llvm-project/libcxx/include/unordered_set
@@ -513,7 +513,7 @@
     typedef value_type&                                                reference;
     typedef const value_type&                                          const_reference;
     static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");
+                  "Allocator::value_type must be same type as value_type");
 
     static_assert(is_same<allocator_type, __rebind_alloc<allocator_traits<allocator_type>, value_type> >::value,
                   "[allocator.requirements] states that rebinding an allocator to the same type should result in the "
@@ -535,7 +535,7 @@
     typedef typename __table::const_local_iterator local_iterator;
     typedef typename __table::const_local_iterator const_local_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __set_node_handle<typename __table::__node, allocator_type> node_type;
     typedef __insert_return_type<iterator, node_type> insert_return_type;
 #endif
@@ -553,7 +553,7 @@
     }
     explicit unordered_set(size_type __n, const hasher& __hf = hasher(),
                            const key_equal& __eql = key_equal());
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     inline _LIBCPP_INLINE_VISIBILITY
     unordered_set(size_type __n, const allocator_type& __a)
         : unordered_set(__n, hasher(), key_equal(), __a) {}
@@ -573,7 +573,7 @@
         unordered_set(_InputIterator __first, _InputIterator __last,
                       size_type __n, const hasher& __hf, const key_equal& __eql,
                       const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class _InputIterator>
     inline _LIBCPP_INLINE_VISIBILITY
         unordered_set(_InputIterator __first, _InputIterator __last,
@@ -600,7 +600,7 @@
     unordered_set(initializer_list<value_type> __il, size_type __n,
                   const hasher& __hf, const key_equal& __eql,
                   const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     inline _LIBCPP_INLINE_VISIBILITY
     unordered_set(initializer_list<value_type> __il, size_type __n,
                                                       const allocator_type& __a)
@@ -711,7 +711,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {__table_.clear();}
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     insert_return_type insert(node_type&& __nh)
     {
@@ -787,31 +787,31 @@
     iterator       find(const key_type& __k)       {return __table_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __table_.find(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     iterator       find(const _K2& __k)            {return __table_.find(__k);}
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const _K2& __k) const      {return __table_.find(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const key_type& __k) const {return __table_.__count_unique(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const _K2& __k) const      {return __table_.__count_unique(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
 
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const _K2& __k) const      {return find(__k) != end();}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const key_type& __k)
@@ -819,7 +819,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
         {return __table_.__equal_range_unique(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template <class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const _K2& __k)
@@ -828,7 +828,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const _K2& __k) const
         {return __table_.__equal_range_unique(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type bucket_count() const _NOEXCEPT {return __table_.bucket_count();}
@@ -1120,7 +1120,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Value, class _Hash, class _Pred, class _Alloc,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1173,7 +1173,7 @@
     typedef value_type&                                                reference;
     typedef const value_type&                                          const_reference;
     static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");
+                  "Allocator::value_type must be same type as value_type");
 
 private:
     typedef __hash_table<value_type, hasher, key_equal, allocator_type> __table;
@@ -1191,7 +1191,7 @@
     typedef typename __table::const_local_iterator local_iterator;
     typedef typename __table::const_local_iterator const_local_iterator;
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     typedef __set_node_handle<typename __table::__node, allocator_type> node_type;
 #endif
 
@@ -1210,7 +1210,7 @@
                                 const key_equal& __eql = key_equal());
     unordered_multiset(size_type __n, const hasher& __hf,
                        const key_equal& __eql, const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     inline _LIBCPP_INLINE_VISIBILITY
     unordered_multiset(size_type __n, const allocator_type& __a)
         : unordered_multiset(__n, hasher(), key_equal(), __a) {}
@@ -1228,7 +1228,7 @@
         unordered_multiset(_InputIterator __first, _InputIterator __last,
                       size_type __n , const hasher& __hf,
                       const key_equal& __eql, const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class _InputIterator>
     inline _LIBCPP_INLINE_VISIBILITY
     unordered_multiset(_InputIterator __first, _InputIterator __last,
@@ -1256,7 +1256,7 @@
     unordered_multiset(initializer_list<value_type> __il, size_type __n,
                        const hasher& __hf, const key_equal& __eql,
                        const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     inline _LIBCPP_INLINE_VISIBILITY
     unordered_multiset(initializer_list<value_type> __il, size_type __n, const allocator_type& __a)
       : unordered_multiset(__il, __n, hasher(), key_equal(), __a) {}
@@ -1338,7 +1338,7 @@
         _LIBCPP_INLINE_VISIBILITY
         void insert(_InputIterator __first, _InputIterator __last);
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_INLINE_VISIBILITY
     iterator insert(node_type&& __nh)
     {
@@ -1425,31 +1425,31 @@
     iterator       find(const key_type& __k)       {return __table_.find(__k);}
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const key_type& __k) const {return __table_.find(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template<class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     iterator       find(const _K2& __k)            {return __table_.find(__k);}
     template<class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     const_iterator find(const _K2& __k) const      {return __table_.find(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const key_type& __k) const {return __table_.__count_multi(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template<class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     size_type count(const _K2& __k) const      {return __table_.__count_multi(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const key_type& __k) const {return find(__k) != end();}
 
     template<class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     bool contains(const _K2& __k) const      {return find(__k) != end();}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const key_type& __k)
@@ -1457,7 +1457,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
         {return __table_.__equal_range_multi(__k);}
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
     template<class _K2, enable_if_t<__is_transparent<hasher, _K2>::value && __is_transparent<key_equal, _K2>::value>* = nullptr>
     _LIBCPP_INLINE_VISIBILITY
     pair<iterator, iterator>             equal_range(const _K2& __k)
@@ -1466,7 +1466,7 @@
     _LIBCPP_INLINE_VISIBILITY
     pair<const_iterator, const_iterator> equal_range(const _K2& __k) const
         {return __table_.__equal_range_multi(__k);}
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
     _LIBCPP_INLINE_VISIBILITY
     size_type bucket_count() const _NOEXCEPT {return __table_.bucket_count();}
@@ -1758,7 +1758,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Value, class _Hash, class _Pred, class _Alloc,
           class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -1803,7 +1803,7 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _KeyT, class _HashT = std::hash<_KeyT>, class _PredT = std::equal_to<_KeyT>>
@@ -1817,8 +1817,10 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <cstdlib>
 #  include <functional>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_UNORDERED_SET
diff --git a/third_party/llvm-project/libcxx/include/utility b/third_party/llvm-project/libcxx/include/utility
index a4d8cf8..1dc16b1 100644
--- a/third_party/llvm-project/libcxx/include/utility
+++ b/third_party/llvm-project/libcxx/include/utility
@@ -117,24 +117,30 @@
 
 template<class T1, class T2> pair(T1, T2) -> pair<T1, T2>;
 
-template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14, removed in C++20
-template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14, removed in C++20
-template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14, removed in C++20
-template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14, removed in C++20
-template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14, removed in C++20
-template <class T1, class T2>
-  constexpr common_comparison_type_t<synth-three-way-result<T1>,
-                                     synth-three-way-result<T2>>
-    operator<=>(const pair<T1,T2>&, const pair<T1,T2>&);                               // C++20
+template <class T1, class T2, class U1, class U2>
+bool operator==(const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14
+template <class T1, class T2, class U1, class U2>
+bool operator!=(const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14, removed in C++20
+template <class T1, class T2, class U1, class U2>
+bool operator< (const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14, removed in C++20
+template <class T1, class T2, class U1, class U2>
+bool operator> (const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14, removed in C++20
+template <class T1, class T2, class U1, class U2>
+bool operator>=(const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14, removed in C++20
+template <class T1, class T2, class U1, class U2>
+bool operator<=(const pair<T1,T2>&, const pair<U1,U2>&);                         // constexpr in C++14, removed in C++20
+template <class T1, class T2, class U1, class U2>
+  constexpr common_comparison_type_t<synth-three-way-result<T1,U1>,
+                                     synth-three-way-result<T2,U2>>
+    operator<=>(const pair<T1,T2>&, const pair<U1,U2>&);                         // C++20
 
 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);                // constexpr in C++14
 template <class T1, class T2>
 void
 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));            // constexpr in C++20
 
-template<class T1, class T2>
-constexpr void swap(const pair<T1, T2>& x, const pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));    // since C++23
+template<class T1, class T2>                                                     // since C++23
+constexpr void swap(const pair<T1, T2>& x, const pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
 
 struct piecewise_construct_t { explicit piecewise_construct_t() = default; };
 inline constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
@@ -208,8 +214,8 @@
   using index_sequence_for = make_index_sequence<sizeof...(T)>;
 
 template<class T, class U=T>
-    constexpr T exchange(T& obj, U&& new_value)
-      noexcept(is_nothrow_move_constructible<T>::value && is_nothrow_assignable<T&, U>::value); // constexpr in C++17, noexcept in C++23
+    constexpr T exchange(T& obj, U&& new_value)                                 // constexpr in C++17, noexcept in C++23
+      noexcept(is_nothrow_move_constructible<T>::value && is_nothrow_assignable<T&, U>::value);
 
 // 20.2.7, in-place construction // C++17
 struct in_place_t {
@@ -266,8 +272,8 @@
 #include <initializer_list>
 
 // [tuple.helper]
-#include <__tuple_dir/tuple_element.h>
-#include <__tuple_dir/tuple_size.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/third_party/llvm-project/libcxx/include/valarray b/third_party/llvm-project/libcxx/include/valarray
index 92521ed..c5ed152 100644
--- a/third_party/llvm-project/libcxx/include/valarray
+++ b/third_party/llvm-project/libcxx/include/valarray
@@ -351,8 +351,10 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__functional/operations.h>
+#include <__memory/addressof.h>
 #include <__memory/allocator.h>
 #include <__memory/uninitialized_algorithms.h>
+#include <__type_traits/decay.h>
 #include <__type_traits/remove_reference.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
@@ -432,7 +434,7 @@
 struct _UnaryOp
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     _A0 __a0_;
@@ -451,7 +453,7 @@
 struct _BinaryOp
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     _A0 __a0_;
@@ -1104,7 +1106,7 @@
     valarray& __assign_range(const value_type* __f, const value_type* __l);
 };
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 template<class _Tp, size_t _Size>
 valarray(const _Tp(&)[_Size], size_t) -> valarray<_Tp>;
 #endif
@@ -1115,7 +1117,7 @@
 struct _UnaryOp<_Op, valarray<_Tp> >
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     const valarray<_Tp>& __a0_;
@@ -1134,7 +1136,7 @@
 struct _BinaryOp<_Op, valarray<_Tp>, _A1>
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     const valarray<_Tp>& __a0_;
@@ -1155,7 +1157,7 @@
 struct _BinaryOp<_Op, _A0, valarray<_Tp> >
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     _A0 __a0_;
@@ -1176,7 +1178,7 @@
 struct _BinaryOp<_Op, valarray<_Tp>, valarray<_Tp> >
 {
     typedef typename _Op::__result_type __result_type;
-    typedef typename decay<__result_type>::type value_type;
+    using value_type = __decay_t<__result_type>;
 
     _Op __op_;
     const valarray<_Tp>& __a0_;
@@ -2818,20 +2820,20 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (size_t __n_left = __n; __n_left; --__n_left, ++__end_)
                 ::new ((void*)__end_) value_type();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2852,20 +2854,20 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (size_t __n_left = __n; __n_left; ++__end_, ++__p, --__n_left)
                 ::new ((void*)__end_) value_type(*__p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2877,20 +2879,20 @@
     if (__v.size())
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__v.size());
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (value_type* __p = __v.__begin_; __p != __v.__end_; ++__end_, ++__p)
                 ::new ((void*)__end_) value_type(*__p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__v.size());
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2914,21 +2916,21 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             size_t __n_left = __n;
             for (const value_type* __p = __il.begin(); __n_left; ++__end_, ++__p, --__n_left)
                 ::new ((void*)__end_) value_type(*__p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2943,21 +2945,21 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             size_t __n_left = __n;
             for (const value_type* __p = __sa.__vp_; __n_left; ++__end_, __p += __sa.__stride_, --__n_left)
                 ::new ((void*)__end_) value_type(*__p);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2970,23 +2972,23 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef const size_t* _Ip;
             const value_type* __s = __ga.__vp_;
             for (_Ip __i = __ga.__1d_.__begin_, __e = __ga.__1d_.__end_;
                     __i != __e; ++__i, ++__end_)
                 ::new ((void*)__end_) value_type(__s[*__i]);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -2999,23 +3001,23 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef const size_t* _Ip;
             const value_type* __s = __ma.__vp_;
             for (_Ip __i = __ma.__1d_.__begin_, __e = __ma.__1d_.__end_;
                     __i != __e; ++__i, ++__end_)
                 ::new ((void*)__end_) value_type(__s[*__i]);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -3028,23 +3030,23 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             typedef const size_t* _Ip;
             const value_type* __s = __ia.__vp_;
             for (_Ip __i = __ia.__1d_.__begin_, __e = __ia.__1d_.__end_;
                     __i != __e; ++__i, ++__end_)
                 ::new ((void*)__end_) value_type(__s[*__i]);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -3753,20 +3755,20 @@
     if (__n)
     {
         __begin_ = __end_ = allocator<value_type>().allocate(__n);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             for (size_t __n_left = __n; __n_left; --__n_left, ++__end_)
                 ::new ((void*)__end_) value_type(__x);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             __clear(__n);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -4933,8 +4935,10 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <algorithm>
 #  include <concepts>
+#  include <cstdlib>
 #  include <cstring>
 #  include <functional>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_VALARRAY
diff --git a/third_party/llvm-project/libcxx/include/variant b/third_party/llvm-project/libcxx/include/variant
index 13c8982..425fead 100644
--- a/third_party/llvm-project/libcxx/include/variant
+++ b/third_party/llvm-project/libcxx/include/variant
@@ -210,10 +210,12 @@
 #include <__compare/compare_three_way_result.h>
 #include <__compare/three_way_comparable.h>
 #include <__config>
+#include <__exception/exception.h>
 #include <__functional/hash.h>
 #include <__functional/invoke.h>
 #include <__functional/operations.h>
 #include <__functional/unary_function.h>
+#include <__memory/addressof.h>
 #include <__type_traits/add_const.h>
 #include <__type_traits/add_cv.h>
 #include <__type_traits/add_pointer.h>
@@ -231,12 +233,13 @@
 #include <__type_traits/remove_const.h>
 #include <__type_traits/type_identity.h>
 #include <__type_traits/void_t.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <__variant/monostate.h>
-#include <exception>
+#include <__verbose_abort>
 #include <initializer_list>
 #include <limits>
 #include <new>
@@ -266,7 +269,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 
 // Light N-dimensional array of function pointers. Used in place of std::array to avoid
 // adding a dependency.
@@ -285,10 +288,10 @@
 inline _LIBCPP_HIDE_FROM_ABI
 _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
 void __throw_bad_variant_access() {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         throw bad_variant_access();
 #else
-        _VSTD::abort();
+    _LIBCPP_VERBOSE_ABORT("bad_variant_access was thrown in -fno-exceptions mode");
 #endif
 }
 
@@ -594,9 +597,9 @@
   template <class _Fp, class _Vp, class... _Vs>
   _LIBCPP_HIDE_FROM_ABI
   static constexpr auto __make_fdiagonal() {
-    constexpr size_t _Np = __remove_cvref_t<_Vp>::__size();
-    static_assert(__all<(_Np == __remove_cvref_t<_Vs>::__size())...>::value);
-    return __make_fdiagonal_impl<_Fp, _Vp, _Vs...>(make_index_sequence<_Np>{});
+    constexpr size_t __np = __remove_cvref_t<_Vp>::__size();
+    static_assert(__all<(__np == __remove_cvref_t<_Vs>::__size())...>::value);
+    return __make_fdiagonal_impl<_Fp, _Vp, _Vs...>(make_index_sequence<__np>{});
   }
 
   template <class _Fp, class... _Vs, size_t... _Is>
@@ -660,7 +663,7 @@
         _VSTD::forward<_Vs>(__vs)...);
   }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   template <class _Rp, class _Visitor, class... _Vs>
   _LIBCPP_HIDE_FROM_ABI
   static constexpr _Rp __visit_value(_Visitor&& __visitor,
@@ -692,7 +695,7 @@
     _Visitor&& __visitor;
   };
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   template <class _Rp, class _Visitor>
   struct __value_visitor_return_type {
     template <class... _Alts>
@@ -721,7 +724,7 @@
     return __value_visitor<_Visitor>{_VSTD::forward<_Visitor>(__visitor)};
   }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
   template <class _Rp, class _Visitor>
   _LIBCPP_HIDE_FROM_ABI
   static constexpr auto __make_value_visitor(_Visitor&& __visitor) {
@@ -1187,7 +1190,7 @@
         _VSTD::swap(__lhs, __rhs);
       }
       __impl __tmp(_VSTD::move(*__rhs));
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
       if constexpr (__all<is_nothrow_move_constructible_v<_Types>...>::value) {
         this->__generic_construct(*__rhs, _VSTD::move(*__lhs));
       } else {
@@ -1652,7 +1655,7 @@
   return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<equal_to<>>{}, __lhs, __rhs);
 }
 
-#  if _LIBCPP_STD_VER > 17
+#  if _LIBCPP_STD_VER >= 20
 
 template <class... _Types> requires (three_way_comparable<_Types> && ...)
 _LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<compare_three_way_result_t<_Types>...>
@@ -1671,7 +1674,7 @@
   return __variant::__visit_value_at(__lhs.index(), __three_way, __lhs, __rhs);
 }
 
-#  endif // _LIBCPP_STD_VER > 17
+#  endif // _LIBCPP_STD_VER >= 20
 
 template <class... _Types>
 _LIBCPP_HIDE_FROM_ABI
@@ -1757,7 +1760,7 @@
                                   _VSTD::forward<_Vs>(__vs)...);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <
     class _Rp, class _Visitor, class... _Vs,
     typename = void_t<decltype(_VSTD::__as_variant(std::declval<_Vs>()))...> >
@@ -1824,13 +1827,14 @@
   return std::__unchecked_get<__find_exactly_one_t<_Tp, _Types...>::value>(__v);
 }
 
-#endif // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER >= 17
 
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <exception>
 #  include <type_traits>
 #  include <typeinfo>
 #  include <utility>
diff --git a/third_party/llvm-project/libcxx/include/vector b/third_party/llvm-project/libcxx/include/vector
index 4b7ae13..40f73b8 100644
--- a/third_party/llvm-project/libcxx/include/vector
+++ b/third_party/llvm-project/libcxx/include/vector
@@ -299,6 +299,7 @@
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
 #include <__iterator/wrap_iter.h>
+#include <__memory/addressof.h>
 #include <__memory/allocate_at_least.h>
 #include <__memory/pointer_traits.h>
 #include <__memory/swap_allocator.h>
@@ -307,18 +308,19 @@
 #include <__memory_resource/polymorphic_allocator.h>
 #include <__split_buffer>
 #include <__type_traits/is_allocator.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_nothrow_move_assignable.h>
 #include <__type_traits/noexcept_move_assign_container.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/exception_guard.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <climits>
-#include <cstdlib>
 #include <cstring>
 #include <iosfwd> // for forward declaration of vector
 #include <limits>
 #include <stdexcept>
-#include <type_traits>
 #include <version>
 
 // standard-mandated includes
@@ -389,7 +391,7 @@
         std::__debug_db_insert_c(this);
     }
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n, const allocator_type& __a);
 #endif
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(size_type __n, const value_type& __x);
@@ -474,7 +476,7 @@
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
     vector(vector&& __x)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         noexcept;
 #else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
@@ -594,7 +596,7 @@
 
     template <class... _Args>
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         reference emplace_back(_Args&&... __args);
 #else
         void      emplace_back(_Args&&... __args);
@@ -1083,7 +1085,7 @@
     __guard.__complete();
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Tp, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
@@ -1216,7 +1218,7 @@
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 inline _LIBCPP_HIDE_FROM_ABI
 vector<_Tp, _Allocator>::vector(vector&& __x)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         noexcept
 #else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
@@ -1512,19 +1514,19 @@
 {
     if (capacity() > size())
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             allocator_type& __a = this->__alloc();
             __split_buffer<value_type, allocator_type&> __v(size(), size(), __a);
             __swap_out_circular_buffer(__v);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -1588,7 +1590,7 @@
 template <class... _Args>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 inline
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 typename vector<_Tp, _Allocator>::reference
 #else
 void
@@ -1601,7 +1603,7 @@
     }
     else
         __emplace_back_slow_path(std::forward<_Args>(__args)...);
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     return this->back();
 #endif
 }
@@ -1831,24 +1833,24 @@
     __split_buffer<value_type, allocator_type&> __v(__a);
     if (__first != __last)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __v.__construct_at_end(__first, __last);
             difference_type __old_size = __old_last - this->__begin_;
             difference_type __old_p = __p - this->__begin_;
             reserve(__recommend(size() + __v.size()));
             __p = this->__begin_ + __old_p;
             __old_last = this->__begin_ + __old_size;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             erase(__make_iter(__old_last), end());
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     __p = std::rotate(__p, __old_last, this->__end_);
     insert(__make_iter(__p), std::make_move_iterator(__v.begin()),
@@ -2123,7 +2125,7 @@
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~vector() { __destroy_vector(*this)(); }
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit vector(size_type __n);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit vector(size_type __n, const allocator_type& __a);
 #endif
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 vector(size_type __n, const value_type& __v);
@@ -2157,7 +2159,7 @@
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     vector(vector&& __v)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         noexcept;
 #else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
@@ -2254,16 +2256,16 @@
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference back()  const {return __make_ref(__size_ - 1);}
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void push_back(const value_type& __x);
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class... _Args>
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference emplace_back(_Args&&... __args)
 #else
     _LIBCPP_HIDE_FROM_ABI void      emplace_back(_Args&&... __args)
 #endif
     {
         push_back ( value_type ( std::forward<_Args>(__args)... ));
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
         return this->back();
 #endif
     }
@@ -2271,7 +2273,7 @@
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void pop_back() {--__size_;}
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
     template <class... _Args>
    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator emplace(const_iterator __position, _Args&&... __args)
         { return insert ( __position, value_type ( std::forward<_Args>(__args)... )); }
@@ -2550,7 +2552,7 @@
     }
 }
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 template <class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<bool, _Allocator>::vector(size_type __n, const allocator_type& __a)
@@ -2603,13 +2605,13 @@
       __size_(0),
       __cap_alloc_(0, __default_init_tag())
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         for (; __first != __last; ++__first)
             push_back(*__first);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -2618,7 +2620,7 @@
         std::__debug_db_invalidate_all(this);
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Allocator>
@@ -2630,13 +2632,13 @@
       __size_(0),
       __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         for (; __first != __last; ++__first)
             push_back(*__first);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -2645,7 +2647,7 @@
         std::__debug_db_invalidate_all(this);
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template <class _Allocator>
@@ -2772,7 +2774,7 @@
 
 template <class _Allocator>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 vector<bool, _Allocator>::vector(vector&& __v)
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
     _NOEXCEPT
 #else
     _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
@@ -2923,17 +2925,17 @@
 {
     if (__external_cap_to_internal(size()) > __cap())
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             vector(*this, allocator_type(__alloc())).swap(*this);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 }
 
@@ -3034,24 +3036,24 @@
     vector __v(get_allocator());
     if (__first != __last)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __v.assign(__first, __last);
             difference_type __old_size = static_cast<difference_type>(__old_end - begin());
             difference_type __old_p = __p - begin();
             reserve(__recommend(size() + __v.size()));
             __p = begin() + __old_p;
             __old_end = begin() + __old_size;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             erase(__old_end, end());
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     __p = std::rotate(__p, __old_end, end());
     insert(__p, __v.begin(), __v.end());
@@ -3293,7 +3295,7 @@
     __x.swap(__y);
 }
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 template <class _Tp, class _Allocator, class _Up>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 inline _LIBCPP_HIDE_FROM_ABI typename vector<_Tp, _Allocator>::size_type
@@ -3319,13 +3321,13 @@
 inline constexpr bool __format::__enable_insertable<vector<wchar_t>> = true;
 #endif
 
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 template <class _Tp, class CharT>
 // Since is-vector-bool-reference is only used once it's inlined here.
   requires same_as<typename _Tp::__container, vector<bool, typename _Tp::__container::allocator_type>>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_Tp, CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<_Tp, CharT> {
 private:
   formatter<bool, CharT> __underlying_;
 
@@ -3340,11 +3342,11 @@
         return __underlying_.format(__ref, __ctx);
   }
 };
-#endif // _LIBCPP_STD_VER > 20
+#endif // _LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 _LIBCPP_BEGIN_NAMESPACE_STD
 namespace pmr {
 template <class _ValueT>
@@ -3359,6 +3361,8 @@
 #  include <algorithm>
 #  include <atomic>
 #  include <concepts>
+#  include <cstdlib>
+#  include <type_traits>
 #  include <typeinfo>
 #  include <utility>
 #endif
diff --git a/third_party/llvm-project/libcxx/include/version b/third_party/llvm-project/libcxx/include/version
index 9705229..f58b51e 100644
--- a/third_party/llvm-project/libcxx/include/version
+++ b/third_party/llvm-project/libcxx/include/version
@@ -85,6 +85,8 @@
 __cpp_lib_expected                                      202202L <expected>
 __cpp_lib_filesystem                                    201703L <filesystem>
 __cpp_lib_format                                        202106L <format>
+__cpp_lib_format_ranges                                 202207L <format>
+__cpp_lib_formatters                                    202302L <stacktrace> <thread>
 __cpp_lib_forward_like                                  202207L <utility>
 __cpp_lib_gcd_lcm                                       201606L <numeric>
 __cpp_lib_generic_associative_lookup                    201304L <map> <set>
@@ -122,6 +124,7 @@
 __cpp_lib_math_constants                                201907L <numbers>
 __cpp_lib_math_special_functions                        201603L <cmath>
 __cpp_lib_memory_resource                               201603L <memory_resource>
+__cpp_lib_move_iterator_concept                         202207L <iterator>
 __cpp_lib_move_only_function                            202110L <functional>
 __cpp_lib_node_extract                                  201606L <map> <set> <unordered_map>
                                                                 <unordered_set>
@@ -139,6 +142,7 @@
 __cpp_lib_quoted_string_io                              201304L <iomanip>
 __cpp_lib_ranges                                        202106L <algorithm> <functional> <iterator>
                                                                 <memory> <ranges>
+__cpp_lib_ranges_as_rvalue                              202207L <ranges>
 __cpp_lib_ranges_chunk                                  202202L <ranges>
 __cpp_lib_ranges_chunk_by                               202202L <ranges>
 __cpp_lib_ranges_iota                                   202202L <numeric>
@@ -208,7 +212,7 @@
 
 // clang-format off
 
-#if _LIBCPP_STD_VER > 11
+#if _LIBCPP_STD_VER >= 14
 # define __cpp_lib_chrono_udls                          201304L
 # define __cpp_lib_complex_udls                         201309L
 # define __cpp_lib_exchange_function                    201304L
@@ -223,7 +227,7 @@
 # define __cpp_lib_quoted_string_io                     201304L
 # define __cpp_lib_result_of_sfinae                     201210L
 # define __cpp_lib_robust_nonmodifying_seq_ops          201304L
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   define __cpp_lib_shared_timed_mutex                 201402L
 # endif
 # define __cpp_lib_string_udls                          201304L
@@ -233,7 +237,7 @@
 # define __cpp_lib_tuples_by_type                       201304L
 #endif
 
-#if _LIBCPP_STD_VER > 14
+#if _LIBCPP_STD_VER >= 17
 # define __cpp_lib_addressof_constexpr                  201603L
 # define __cpp_lib_allocator_traits_is_always_equal     201411L
 # define __cpp_lib_any                                  201606L
@@ -248,7 +252,7 @@
 # define __cpp_lib_clamp                                201603L
 # define __cpp_lib_enable_shared_from_this              201603L
 // # define __cpp_lib_execution                            201603L
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   define __cpp_lib_filesystem                         201703L
 # endif
 # define __cpp_lib_gcd_lcm                              201606L
@@ -276,7 +280,7 @@
 # define __cpp_lib_raw_memory_algorithms                201606L
 # define __cpp_lib_sample                               201603L
 # define __cpp_lib_scoped_lock                          201703L
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   define __cpp_lib_shared_mutex                       201505L
 # endif
 # define __cpp_lib_shared_ptr_arrays                    201611L
@@ -292,7 +296,7 @@
 # define __cpp_lib_void_t                               201411L
 #endif
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 # undef  __cpp_lib_array_constexpr
 # define __cpp_lib_array_constexpr                      201811L
 # define __cpp_lib_assume_aligned                       201811L
@@ -302,10 +306,10 @@
 // # define __cpp_lib_atomic_ref                           201806L
 // # define __cpp_lib_atomic_shared_ptr                    201711L
 # define __cpp_lib_atomic_value_initialization          201911L
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   define __cpp_lib_atomic_wait                        201907L
 # endif
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   define __cpp_lib_barrier                            201907L
 # endif
 # define __cpp_lib_bind_front                           201907L
@@ -329,14 +333,14 @@
 # define __cpp_lib_constexpr_utility                    201811L
 # define __cpp_lib_constexpr_vector                     201907L
 # define __cpp_lib_coroutine                            201902L
-# if _LIBCPP_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
+# if _LIBCPP_STD_VER >= 20 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
 #   define __cpp_lib_destroying_delete                  201806L
 # endif
 # define __cpp_lib_endian                               201907L
 # define __cpp_lib_erase_if                             202002L
 # undef  __cpp_lib_execution
 // # define __cpp_lib_execution                            201902L
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 // #   define __cpp_lib_format                             202106L
 # endif
 # define __cpp_lib_generic_unordered_lookup             201811L
@@ -350,22 +354,23 @@
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 // #   define __cpp_lib_jthread                            201911L
 # endif
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   define __cpp_lib_latch                              201907L
 # endif
 # define __cpp_lib_list_remove_return_type              201806L
 # define __cpp_lib_math_constants                       201907L
+# define __cpp_lib_move_iterator_concept                202207L
 # define __cpp_lib_polymorphic_allocator                201902L
 # define __cpp_lib_ranges                               202106L
 # define __cpp_lib_remove_cvref                         201711L
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   define __cpp_lib_semaphore                          201907L
 # endif
 # undef  __cpp_lib_shared_ptr_arrays
 # define __cpp_lib_shared_ptr_arrays                    201707L
 # define __cpp_lib_shift                                201806L
 // # define __cpp_lib_smart_ptr_for_overwrite              202002L
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)
 #   define __cpp_lib_source_location                    201907L
 # endif
 # define __cpp_lib_span                                 202002L
@@ -381,7 +386,7 @@
 # define __cpp_lib_unwrap_ref                           201811L
 #endif
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 # define __cpp_lib_adaptor_iterator_pair_constructor    202106L
 # define __cpp_lib_allocate_at_least                    202106L
 // # define __cpp_lib_associative_heterogeneous_erasure    202110L
@@ -392,15 +397,22 @@
 // # define __cpp_lib_constexpr_cmath                      202202L
 # undef  __cpp_lib_constexpr_memory
 # define __cpp_lib_constexpr_memory                     202202L
-// # define __cpp_lib_constexpr_typeinfo                   202106L
+# define __cpp_lib_constexpr_typeinfo                   202106L
 # define __cpp_lib_expected                             202202L
+# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#   define __cpp_lib_format_ranges                      202207L
+# endif
+# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+// #   define __cpp_lib_formatters                         202302L
+# endif
 # define __cpp_lib_forward_like                         202207L
-// # define __cpp_lib_invoke_r                             202106L
+# define __cpp_lib_invoke_r                             202106L
 # define __cpp_lib_is_scoped_enum                       202011L
 // # define __cpp_lib_move_only_function                   202110L
 # undef  __cpp_lib_optional
 # define __cpp_lib_optional                             202110L
 // # define __cpp_lib_out_ptr                              202106L
+# define __cpp_lib_ranges_as_rvalue                     202207L
 // # define __cpp_lib_ranges_chunk                         202202L
 // # define __cpp_lib_ranges_chunk_by                      202202L
 // # define __cpp_lib_ranges_iota                          202202L
diff --git a/third_party/llvm-project/libcxx/lib/abi/CHANGELOG.TXT b/third_party/llvm-project/libcxx/lib/abi/CHANGELOG.TXT
index 6f17e85..8661ab4 100644
--- a/third_party/llvm-project/libcxx/lib/abi/CHANGELOG.TXT
+++ b/third_party/llvm-project/libcxx/lib/abi/CHANGELOG.TXT
@@ -13,6 +13,34 @@
 New entries should be added directly below the "Version" header.
 
 ------------
+Version 17.0
+------------
+
+* [libc++] Remove explicit instantiations of __insertion_sort_incomplete and __sort5 from the dylib
+
+  These instantiations were never visible, because they are only used in `__sort`, which is also explicitly
+  instantiated in the dylib.
+
+  All platforms
+  -------------
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_
+  Symbol removed: _ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_
+  Symbol removed: _ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_
+
+------------
 Version 16.0
 ------------
 
@@ -159,7 +187,7 @@
   In fact, any program that would have attempted to refer to that symbol would
   have previously failed to link.
 
-  x86_64-apple-apple-darwin
+  <arch>-apple-darwin
   -------------------------
   Symbol added: _ZNSt3__15ctypeIcE10table_sizeE
 
@@ -338,7 +366,7 @@
   Those were previously defined in both libc++ and libc++abi, which was an
   ODR violation.
 
-  <arch>-apple-apple-darwin
+  <arch>-apple-darwin
   -------------------------
   The following symbols are now re-exported from libc++abi instead of exported
   by libc++ directly (this should not be an ABI break):
@@ -396,8 +424,8 @@
   We re-export some symbols that were exported from libc++abi but not from
   libc++. Exporting new symbols is not an ABI break.
 
-  x86_64-apple-apple-darwin
-  -------------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol added: ___cxa_allocate_dependent_exception
   Symbol added: ___cxa_free_dependent_exception
 
@@ -411,12 +439,8 @@
   adds a few symbols to the dylib. This is backwards-compatible since we're
   just adding new symbols.
 
-  x86_64-unknown-linux-gnu
-  ------------------------
-  TODO
-
-  <arch>-apple-apple-darwin
-  -------------------------
+  All platforms
+  -------------
   Symbol added: __ZNSt3__120__libcpp_atomic_waitEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEEx
   Symbol added: __ZNSt3__120__libcpp_atomic_waitEPVKvx
   Symbol added: __ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE
@@ -441,12 +465,8 @@
   against an older version of libc++abi that doesn't provide those symbols,
   however doing so is not supported anyway.
 
-  x86_64-unknown-linux-gnu
-  ------------------------
-  TODO
-
-  x86_64-apple-apple-darwin
-  -------------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol added: ___cxa_throw_bad_array_new_length
   Symbol added: ___cxa_uncaught_exceptions
 
@@ -566,11 +586,10 @@
   Symbol removed: _ZTSNSt3__124__libcpp_debug_exceptionE
   Symbol removed: _ZTVNSt3__124__libcpp_debug_exceptionE
 
-
-    x86_64-apple-apple-darwin
-    -------------------------
-    Symbol added: __ZNSt3__111__libcpp_db10__insert_cEPvPFPNS_8__c_nodeES1_S1_S3_E
-    Symbol removed: __ZNSt3__111__libcpp_db10__insert_cEPv
+  <arch>-apple-darwin
+  -------------------
+  Symbol added: __ZNSt3__111__libcpp_db10__insert_cEPvPFPNS_8__c_nodeES1_S1_S3_E
+  Symbol removed: __ZNSt3__111__libcpp_db10__insert_cEPv
 
 * r355367 - Fix -fsanitize=vptr badness in <__debug>
 
@@ -598,8 +617,8 @@
   users couldn't be relying on the functionality because it is marked as being
   unavailable using Clang's availability attribute.
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol removed: __ZNKSt16bad_array_length4whatEv
   Symbol removed: __ZNKSt16bad_array_length4whatEv
   Symbol removed: __ZNSt16bad_array_lengthC1Ev
@@ -678,8 +697,8 @@
   Symbol removed: _ZNSt3__121__thread_specific_ptrINS_15__thread_structEE16__at_thread_exitEPv
   Symbol removed: _ZNSt3__119__start_std_streamsE
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol removed: __ZNSt3__221__thread_specific_ptrINS_15__thread_structEE16__at_thread_exitEPv
   Symbol removed: __ZNSt3__119__start_std_streamsE
 
@@ -696,8 +715,8 @@
   Symbol added: _ZNSt3__16__itoa8__u64toaEmPc
   Symbol added: _ZNSt3__16__itoa8__u32toaEjPc
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol added: __ZNSt3__16__itoa8__u64toaEyPc
   Symbol added: __ZNSt3__16__itoa8__u32toaEjPc
 
@@ -725,8 +744,8 @@
   ----------------
   No changes
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   Symbol added: ___cxa_deleted_virtual
 
 * r296729 - Remove std::num_get template methods which should be inline
@@ -757,8 +776,8 @@
   Symbol removed: _ZNKSt3__17num_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEE23__do_get_floating_pointIeEES4_S4_S4_RNS_8ios_baseERjRT_
   Symbol removed: _ZNKSt3__17num_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEE23__do_get_floating_pointIfEES4_S4_S4_RNS_8ios_baseERjRT_
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   No changes
 
 -----------
@@ -808,8 +827,8 @@
   Symbol removed: _ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6appendIPcEENS_9enable_ifIXaasr21__is_forward_iteratorIT_EE5valuesr38__libcpp_string_gets_noexcept_iteratorIS9_EE5valueERS5_E4typeES9_S9_
   Symbol removed: _ZNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE6appendIPwEENS_9enable_ifIXaasr21__is_forward_iteratorIT_EE5valuesr38__libcpp_string_gets_noexcept_iteratorIS9_EE5valueERS5_E4typeES9_S9_
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   No changes
 
 * r285101 - Add -fvisibility-inlines-hidden when building libc++.
@@ -841,8 +860,8 @@
   Symbol removed: _ZNSt3__120__codecvt_utf8_utf16IDsED0Ev
   Symbol removed: _ZNSt3__120__codecvt_utf8_utf16IwED0Ev
 
-  x86_64-apple-darwin16.0
-  -----------------------
+  <arch>-apple-darwin
+  -------------------
   No Changes - inline symbols are already hidden
 
 * r284206 - Implement C++17 aligned allocation in <new>
@@ -881,8 +900,7 @@
   Symbol added: _ZTSSt12bad_any_cast
   Symbol added: _ZTVSt12bad_any_cast
 
-* r295398 - Remove basic_string::insert and basic_string::replace template methods
-    which should be inline.
+* r295398 - Remove basic_string::insert and basic_string::replace template methods which should be inline.
 
   These functions should never have had visible definitions in the dylib but
   since they were previously not specified with 'inline' they accidentally
diff --git a/third_party/llvm-project/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
index 774bf39..3db8b28 100644
--- a/third_party/llvm-project/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1540,21 +1540,6 @@
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__134__construct_barrier_algorithm_baseERl', 'type': 'FUNC'}
@@ -1739,7 +1724,6 @@
 {'is_defined': True, 'name': '__ZNSt3__16thread6detachEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__16threadD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__16threadD2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tED1Ev', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
index 3323fd5..7c90dd2 100644
--- a/third_party/llvm-project/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1714,21 +1714,6 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__14__fs10filesystem16_FilesystemClock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__14__fs10filesystem4path19preferred_separatorE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16__sortIRNS_6__lessIaaEEPaEEvT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
@@ -1748,7 +1733,6 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16__sortIRNS_6__lessIyyEEPyEEvT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16chrono12steady_clock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16chrono12system_clock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcE2idE', 'storage_mapping_class': 'RW', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcED0Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcED1Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
index 318b85b..f0eb2a6 100644
--- a/third_party/llvm-project/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1714,21 +1714,6 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__14__fs10filesystem16_FilesystemClock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__14__fs10filesystem4path19preferred_separatorE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16__sortIRNS_6__lessIaaEEPaEEvT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
@@ -1748,7 +1733,6 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16__sortIRNS_6__lessIyyEEPyEEvT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16chrono12steady_clock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__16chrono12system_clock9is_steadyE', 'storage_mapping_class': 'RO', 'type': 'OBJECT'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcE2idE', 'storage_mapping_class': 'RW', 'type': 'OBJECT'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcED0Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__17collateIcED1Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
index 70161ed..8eb7039 100644
--- a/third_party/llvm-project/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1540,21 +1540,6 @@
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__134__construct_barrier_algorithm_baseERl', 'type': 'FUNC'}
@@ -1739,7 +1724,6 @@
 {'is_defined': True, 'name': '__ZNSt3__16thread6detachEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__16threadD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__16threadD2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__17codecvtIDiDu11__mbstate_tED1Ev', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
index 01a3ea9..3f8ff0f 100644
--- a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1235,21 +1235,6 @@
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIlNS_22__cxx_atomic_base_implIlEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__134__construct_barrier_algorithm_baseERl', 'type': 'FUNC'}
@@ -1434,7 +1419,6 @@
 {'is_defined': True, 'name': '_ZNSt3__16thread6detachEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tE2idE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED1Ev', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
index d56172f..dfa36dc 100644
--- a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1233,21 +1233,6 @@
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__134__construct_barrier_algorithm_baseERl', 'type': 'FUNC'}
@@ -1435,7 +1420,6 @@
 {'is_defined': True, 'name': '_ZNSt3__16thread6detachEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tE2idE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED1Ev', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist
index 06a3b25..d9ba05c 100644
--- a/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist
+++ b/third_party/llvm-project/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist
@@ -1205,21 +1205,6 @@
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__134__construct_barrier_algorithm_baseERl', 'type': 'FUNC'}
@@ -1407,7 +1392,6 @@
 {'is_defined': True, 'name': '_ZNSt3__16thread6detachEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__16threadD2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__17__sort5IRNS_6__lessIeeEEPeEEjT0_S5_S5_S5_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tE2idE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__17codecvtIDiDu11__mbstate_tED1Ev', 'type': 'FUNC'}
diff --git a/third_party/llvm-project/libcxx/src/algorithm.cpp b/third_party/llvm-project/libcxx/src/algorithm.cpp
index bd47e08..5a47558 100644
--- a/third_party/llvm-project/libcxx/src/algorithm.cpp
+++ b/third_party/llvm-project/libcxx/src/algorithm.cpp
@@ -7,11 +7,24 @@
 //===----------------------------------------------------------------------===//
 
 #include <algorithm>
+#include <bit>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-// TODO(varconst): this currently doesn't benefit `ranges::sort` because it uses `ranges::less` instead of `__less`.
+template <class Comp, class RandomAccessIterator>
+void __sort(RandomAccessIterator first, RandomAccessIterator last, Comp comp) {
+  auto depth_limit = 2 * std::__bit_log2(static_cast<size_t>(last - first));
 
+  // Only use bitset partitioning for arithmetic types.  We should also check
+  // that the default comparator is in use so that we are sure that there are no
+  // branches in the comparator.
+  std::__introsort<_ClassicAlgPolicy,
+                   Comp&,
+                   RandomAccessIterator,
+                   __use_branchless_sort<Comp, RandomAccessIterator>::value>(first, last, comp, depth_limit);
+}
+
+// clang-format off
 template void __sort<__less<char>&, char*>(char*, char*, __less<char>&);
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template void __sort<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
@@ -29,25 +42,6 @@
 template void __sort<__less<float>&, float*>(float*, float*, __less<float>&);
 template void __sort<__less<double>&, double*>(double*, double*, __less<double>&);
 template void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
-
-template bool __insertion_sort_incomplete<__less<char>&, char*>(char*, char*, __less<char>&);
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-template bool __insertion_sort_incomplete<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
-#endif
-template bool __insertion_sort_incomplete<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&);
-template bool __insertion_sort_incomplete<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&);
-template bool __insertion_sort_incomplete<__less<short>&, short*>(short*, short*, __less<short>&);
-template bool __insertion_sort_incomplete<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&);
-template bool __insertion_sort_incomplete<__less<int>&, int*>(int*, int*, __less<int>&);
-template bool __insertion_sort_incomplete<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&);
-template bool __insertion_sort_incomplete<__less<long>&, long*>(long*, long*, __less<long>&);
-template bool __insertion_sort_incomplete<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&);
-template bool __insertion_sort_incomplete<__less<long long>&, long long*>(long long*, long long*, __less<long long>&);
-template bool __insertion_sort_incomplete<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&);
-template bool __insertion_sort_incomplete<__less<float>&, float*>(float*, float*, __less<float>&);
-template bool __insertion_sort_incomplete<__less<double>&, double*>(double*, double*, __less<double>&);
-template bool __insertion_sort_incomplete<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
-
-template unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&);
+// clang-format on
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/third_party/llvm-project/libcxx/src/atomic.cpp b/third_party/llvm-project/libcxx/src/atomic.cpp
index 7777e88..9a34210 100644
--- a/third_party/llvm-project/libcxx/src/atomic.cpp
+++ b/third_party/llvm-project/libcxx/src/atomic.cpp
@@ -77,20 +77,25 @@
                  const_cast<__cxx_atomic_contention_t*>(__ptr), 0);
 }
 
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) && __SIZEOF_LONG__ == 8
+/*
+ * Since __cxx_contention_t is int64_t even on 32bit FreeBSD
+ * platforms, we have to use umtx ops that work on the long type, and
+ * limit its use to architectures where long and int64_t are synonyms.
+ */
 
 static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
                                               __cxx_contention_t __val)
 {
     _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
-             UMTX_OP_WAIT_UINT_PRIVATE, __val, NULL, NULL);
+             UMTX_OP_WAIT, __val, NULL, NULL);
 }
 
 static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
                                               bool __notify_one)
 {
     _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
-             UMTX_OP_WAKE_PRIVATE, __notify_one ? 1 : INT_MAX, NULL, NULL);
+             UMTX_OP_WAKE, __notify_one ? 1 : INT_MAX, NULL, NULL);
 }
 
 #else // <- Add other operating systems here
diff --git a/third_party/llvm-project/libcxx/src/chrono.cpp b/third_party/llvm-project/libcxx/src/chrono.cpp
index 0af89d6..213f888 100644
--- a/third_party/llvm-project/libcxx/src/chrono.cpp
+++ b/third_party/llvm-project/libcxx/src/chrono.cpp
@@ -12,9 +12,9 @@
 #define _LARGE_TIME_API
 #endif
 
-#include <cerrno>        // errno
+#include <__system_error/system_error.h>
+#include <cerrno> // errno
 #include <chrono>
-#include <system_error>  // __throw_system_error
 
 #if defined(__MVS__)
 #include <__support/ibm/gettod_zos.h> // gettimeofdayMonotonic
@@ -167,59 +167,6 @@
 
 #if defined(__APPLE__)
 
-// TODO(ldionne):
-// This old implementation of steady_clock is retained until Chrome drops supports
-// for macOS < 10.12. The issue is that they link libc++ statically into their
-// application, which means that libc++ must support being built for such deployment
-// targets. See https://llvm.org/D74489 for details.
-#if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) || \
-    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \
-    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) || \
-    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
-# define _LIBCPP_USE_OLD_MACH_ABSOLUTE_TIME
-#endif
-
-#if defined(_LIBCPP_USE_OLD_MACH_ABSOLUTE_TIME)
-
-//   mach_absolute_time() * MachInfo.numer / MachInfo.denom is the number of
-//   nanoseconds since the computer booted up.  MachInfo.numer and MachInfo.denom
-//   are run time constants supplied by the OS.  This clock has no relationship
-//   to the Gregorian calendar.  It's main use is as a high resolution timer.
-
-// MachInfo.numer / MachInfo.denom is often 1 on the latest equipment.  Specialize
-//   for that case as an optimization.
-
-static steady_clock::rep steady_simplified() {
-    return static_cast<steady_clock::rep>(mach_absolute_time());
-}
-static double compute_steady_factor() {
-    mach_timebase_info_data_t MachInfo;
-    mach_timebase_info(&MachInfo);
-    return static_cast<double>(MachInfo.numer) / MachInfo.denom;
-}
-
-static steady_clock::rep steady_full() {
-    static const double factor = compute_steady_factor();
-    return static_cast<steady_clock::rep>(mach_absolute_time() * factor);
-}
-
-typedef steady_clock::rep (*FP)();
-
-static FP init_steady_clock() {
-    mach_timebase_info_data_t MachInfo;
-    mach_timebase_info(&MachInfo);
-    if (MachInfo.numer == MachInfo.denom)
-        return &steady_simplified;
-    return &steady_full;
-}
-
-static steady_clock::time_point __libcpp_steady_clock_now() {
-    static FP fp = init_steady_clock();
-    return steady_clock::time_point(steady_clock::duration(fp()));
-}
-
-#else // vvvvv default behavior for Apple platforms  vvvvv
-
 // On Apple platforms, only CLOCK_UPTIME_RAW, CLOCK_MONOTONIC_RAW or
 // mach_absolute_time are able to time functions in the nanosecond range.
 // Furthermore, only CLOCK_MONOTONIC_RAW is truly monotonic, because it
@@ -232,8 +179,6 @@
     return steady_clock::time_point(seconds(tp.tv_sec) + nanoseconds(tp.tv_nsec));
 }
 
-#endif
-
 #elif defined(_LIBCPP_WIN32API)
 
 // https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx says:
diff --git a/third_party/llvm-project/libcxx/src/condition_variable.cpp b/third_party/llvm-project/libcxx/src/condition_variable.cpp
index b17c4cf..85f334e 100644
--- a/third_party/llvm-project/libcxx/src/condition_variable.cpp
+++ b/third_party/llvm-project/libcxx/src/condition_variable.cpp
@@ -12,7 +12,6 @@
 
 #include <condition_variable>
 #include <thread>
-#include <system_error>
 
 #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
 #  pragma comment(lib, "pthread")
diff --git a/third_party/llvm-project/libcxx/src/filesystem/filesystem_common.h b/third_party/llvm-project/libcxx/src/filesystem/filesystem_common.h
index 0e71569..a1756cf 100644
--- a/third_party/llvm-project/libcxx/src/filesystem/filesystem_common.h
+++ b/third_party/llvm-project/libcxx/src/filesystem/filesystem_common.h
@@ -12,14 +12,15 @@
 #include <__assert>
 #include <__config>
 #include <array>
+#include <cerrno>
 #include <chrono>
 #include <climits>
 #include <cstdarg>
 #include <ctime>
 #include <filesystem>
 #include <ratio>
-#include <system_error>
 #include <utility>
+#include <system_error>
 
 #if defined(_LIBCPP_WIN32API)
 # define WIN32_LEAN_AND_MEAN
@@ -34,19 +35,16 @@
 # include <unistd.h>
 #endif // defined(_LIBCPP_WIN32API)
 
-#include "../include/apple_availability.h"
-
-#if !defined(__APPLE__)
-// We can use the presence of UTIME_OMIT to detect platforms that provide
-// utimensat.
+// We can use the presence of UTIME_OMIT to detect platforms that provide utimensat.
 #if defined(UTIME_OMIT)
-#define _LIBCPP_USE_UTIMENSAT
-#endif
+# define _LIBCPP_USE_UTIMENSAT
 #endif
 
+// TODO: Check whether these functions actually need internal linkage, or if they can be made normal header functions
 _LIBCPP_DIAGNOSTIC_PUSH
 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wunused-function")
 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-function")
+_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-template")
 
 #if defined(_LIBCPP_WIN32API)
 #  define PATHSTR(x) (L##x)
@@ -96,16 +94,16 @@
   string ret;
   va_list ap;
   va_start(ap, msg);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     ret = format_string_impl(msg, ap);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
     va_end(ap);
     throw;
   }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
   va_end(ap);
   return ret;
 }
@@ -202,16 +200,16 @@
   T report(const error_code& ec, const char* msg, ...) const {
     va_list ap;
     va_start(ap, msg);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
       report_impl(ec, msg, ap);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
       va_end(ap);
       throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     va_end(ap);
     return error_value<T>();
   }
@@ -224,16 +222,16 @@
   T report(errc const& err, const char* msg, ...) const {
     va_list ap;
     va_start(ap, msg);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
       report_impl(make_error_code(err), msg, ap);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     } catch (...) {
       va_end(ap);
       throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     va_end(ap);
     return error_value<T>();
   }
diff --git a/third_party/llvm-project/libcxx/src/future.cpp b/third_party/llvm-project/libcxx/src/future.cpp
index cdaa938..f8f466b 100644
--- a/third_party/llvm-project/libcxx/src/future.cpp
+++ b/third_party/llvm-project/libcxx/src/future.cpp
@@ -197,12 +197,12 @@
 {
     if (__state_)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         if (!__state_->__has_value() && __state_->use_count() > 1)
             __state_->set_exception(make_exception_ptr(
                       future_error(make_error_code(future_errc::broken_promise))
                                                       ));
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __state_->__release_shared();
     }
 }
diff --git a/third_party/llvm-project/libcxx/src/include/apple_availability.h b/third_party/llvm-project/libcxx/src/include/apple_availability.h
index 75bf796..c8d158e 100644
--- a/third_party/llvm-project/libcxx/src/include/apple_availability.h
+++ b/third_party/llvm-project/libcxx/src/include/apple_availability.h
@@ -12,24 +12,6 @@
 #if defined(__APPLE__)
 
 #if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101300
-#define _LIBCPP_USE_UTIMENSAT
-#endif
-#elif defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ >= 110000
-#define _LIBCPP_USE_UTIMENSAT
-#endif
-#elif defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ >= 110000
-#define _LIBCPP_USE_UTIMENSAT
-#endif
-#elif defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 40000
-#define _LIBCPP_USE_UTIMENSAT
-#endif
-#endif // __ENVIRONMENT_.*_VERSION_MIN_REQUIRED__
-
-#if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
 #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101500
 #define _LIBCPP_USE_ULOCK
 #endif
diff --git a/third_party/llvm-project/libcxx/src/include/ryu/common.h b/third_party/llvm-project/libcxx/src/include/ryu/common.h
index c24115c..4503e6d 100644
--- a/third_party/llvm-project/libcxx/src/include/ryu/common.h
+++ b/third_party/llvm-project/libcxx/src/include/ryu/common.h
@@ -43,7 +43,8 @@
 // clang-format off
 
 #include <__assert>
-#include "__config"
+#include <__config>
+#include <cstring>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -91,13 +92,13 @@
 
 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint32_t __float_to_bits(const float __f) {
   uint32_t __bits = 0;
-  _VSTD::memcpy(&__bits, &__f, sizeof(float));
+  std::memcpy(&__bits, &__f, sizeof(float));
   return __bits;
 }
 
 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint64_t __double_to_bits(const double __d) {
   uint64_t __bits = 0;
-  _VSTD::memcpy(&__bits, &__d, sizeof(double));
+  std::memcpy(&__bits, &__d, sizeof(double));
   return __bits;
 }
 
diff --git a/third_party/llvm-project/libcxx/src/include/ryu/ryu.h b/third_party/llvm-project/libcxx/src/include/ryu/ryu.h
index cb44bd3..8bd34cd 100644
--- a/third_party/llvm-project/libcxx/src/include/ryu/ryu.h
+++ b/third_party/llvm-project/libcxx/src/include/ryu/ryu.h
@@ -48,7 +48,7 @@
 #include <__charconv/to_chars_result.h>
 #include <__config>
 #include <__debug>
-#include <__errc>
+#include <__system_error/errc.h>
 #include <cstdint>
 #include <cstring>
 #include <type_traits>
diff --git a/third_party/llvm-project/libcxx/src/ios.cpp b/third_party/llvm-project/libcxx/src/ios.cpp
index 870406b..bb62eb9 100644
--- a/third_party/llvm-project/libcxx/src/ios.cpp
+++ b/third_party/llvm-project/libcxx/src/ios.cpp
@@ -413,20 +413,20 @@
 ios_base::__set_badbit_and_consider_rethrow()
 {
     __rdstate_ |= badbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     if (__exceptions_ & badbit)
         throw;
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 void
 ios_base::__set_failbit_and_consider_rethrow()
 {
     __rdstate_ |= failbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     if (__exceptions_ & failbit)
         throw;
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 bool
diff --git a/third_party/llvm-project/libcxx/src/iostream.cpp b/third_party/llvm-project/libcxx/src/iostream.cpp
index a8948ac..36c6894 100644
--- a/third_party/llvm-project/libcxx/src/iostream.cpp
+++ b/third_party/llvm-project/libcxx/src/iostream.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include <__locale>
-#include <__std_stream>
+#include "std_stream.h"
 #include <new>
 #include <string>
 
diff --git a/third_party/llvm-project/libcxx/src/locale.cpp b/third_party/llvm-project/libcxx/src/locale.cpp
index 678c487..1e60c02 100644
--- a/third_party/llvm-project/libcxx/src/locale.cpp
+++ b/third_party/llvm-project/libcxx/src/locale.cpp
@@ -118,7 +118,7 @@
 
 _LIBCPP_NORETURN static void __throw_runtime_error(const string &msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw runtime_error(msg);
 #else
     (void)msg;
@@ -236,10 +236,10 @@
       facets_(N),
       name_(name)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         facets_ = locale::classic().__locale_->facets_;
         for (unsigned i = 0; i < facets_.size(); ++i)
             if (facets_[i])
@@ -286,7 +286,7 @@
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
         install(new messages_byname<wchar_t>(name_));
 #endif
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -295,7 +295,7 @@
                 facets_[i]->__release_shared();
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 locale::__imp::__imp(const __imp& other)
@@ -316,10 +316,10 @@
     for (unsigned i = 0; i < facets_.size(); ++i)
         if (facets_[i])
             facets_[i]->__add_shared();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         if (c & locale::collate)
         {
             install(new collate_byname<char>(name));
@@ -380,7 +380,7 @@
             install(new messages_byname<wchar_t>(name));
 #endif
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -389,7 +389,7 @@
                 facets_[i]->__release_shared();
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 template<class F>
@@ -409,10 +409,10 @@
     for (unsigned i = 0; i < facets_.size(); ++i)
         if (facets_[i])
             facets_[i]->__add_shared();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         if (c & locale::collate)
         {
             install_from<_VSTD::collate<char> >(one);
@@ -489,7 +489,7 @@
             install_from<_VSTD::messages<wchar_t> >(one);
 #endif
         }
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -498,7 +498,7 @@
                 facets_[i]->__release_shared();
         throw;
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 locale::__imp::__imp(const __imp& other, facet* f, long id)
@@ -6529,7 +6529,7 @@
 
 void __throw_runtime_error(const char* msg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw runtime_error(msg);
 #else
     (void)msg;
diff --git a/third_party/llvm-project/libcxx/src/memory_resource.cpp b/third_party/llvm-project/libcxx/src/memory_resource.cpp
index e00611d..ca1d640 100644
--- a/third_party/llvm-project/libcxx/src/memory_resource.cpp
+++ b/third_party/llvm-project/libcxx/src/memory_resource.cpp
@@ -107,7 +107,7 @@
     new_res = new_res ? new_res : new_delete_resource();
     lock_guard<mutex> guard(res_lock);
     memory_resource* old_res = res;
-    res = new_res;
+    res                      = new_res;
     return old_res;
   } else {
     lock_guard<mutex> guard(res_lock);
diff --git a/third_party/llvm-project/libcxx/src/mutex.cpp b/third_party/llvm-project/libcxx/src/mutex.cpp
index e73df81..c25010f 100644
--- a/third_party/llvm-project/libcxx/src/mutex.cpp
+++ b/third_party/llvm-project/libcxx/src/mutex.cpp
@@ -9,7 +9,6 @@
 #include <__assert>
 #include <limits>
 #include <mutex>
-#include <system_error>
 
 #include "include/atomic_support.h"
 
@@ -211,21 +210,21 @@
 #if defined(_LIBCPP_HAS_NO_THREADS)
     if (flag == 0)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             flag = 1;
             func(arg);
             flag = ~once_flag::_State_type(0);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
             flag = 0;
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
 #else // !_LIBCPP_HAS_NO_THREADS
     __libcpp_mutex_lock(&mut);
@@ -233,10 +232,10 @@
         __libcpp_condvar_wait(&cv, &mut);
     if (flag == 0)
     {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         try
         {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
             __libcpp_relaxed_store(&flag, once_flag::_State_type(1));
             __libcpp_mutex_unlock(&mut);
             func(arg);
@@ -245,7 +244,7 @@
                                   _AO_Release);
             __libcpp_mutex_unlock(&mut);
             __libcpp_condvar_broadcast(&cv);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         }
         catch (...)
         {
@@ -255,7 +254,7 @@
             __libcpp_condvar_broadcast(&cv);
             throw;
         }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     }
     else
         __libcpp_mutex_unlock(&mut);
diff --git a/third_party/llvm-project/libcxx/src/new.cpp b/third_party/llvm-project/libcxx/src/new.cpp
index 48d6f99..3c3d1dc 100644
--- a/third_party/llvm-project/libcxx/src/new.cpp
+++ b/third_party/llvm-project/libcxx/src/new.cpp
@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <__memory/aligned_alloc.h>
 #include <new>
 #include <stdlib.h>
 
@@ -38,7 +39,7 @@
 void
 __throw_bad_alloc()
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw bad_alloc();
 #else
     _VSTD::abort();
@@ -72,7 +73,7 @@
         if (nh)
             nh();
         else
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             throw std::bad_alloc();
 #else
             break;
@@ -86,17 +87,17 @@
 operator new(size_t size, const std::nothrow_t&) noexcept
 {
     void* p = nullptr;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         p = ::operator new(size);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return p;
 }
 
@@ -112,17 +113,17 @@
 operator new[](size_t size, const std::nothrow_t&) noexcept
 {
     void* p = nullptr;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         p = ::operator new[](size);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return p;
 }
 
@@ -192,7 +193,7 @@
         if (nh)
             nh();
         else {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
             throw std::bad_alloc();
 #else
             break;
@@ -207,17 +208,17 @@
 operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept
 {
     void* p = nullptr;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         p = ::operator new(size, alignment);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return p;
 }
 
@@ -233,17 +234,17 @@
 operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept
 {
     void* p = nullptr;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         p = ::operator new[](size, alignment);
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
     return p;
 }
 
diff --git a/third_party/llvm-project/libcxx/src/random.cpp b/third_party/llvm-project/libcxx/src/random.cpp
index 3873246..c120d6a 100644
--- a/third_party/llvm-project/libcxx/src/random.cpp
+++ b/third_party/llvm-project/libcxx/src/random.cpp
@@ -13,9 +13,9 @@
 #   define _CRT_RAND_S
 #endif // defined(_LIBCPP_USING_WIN32_RANDOM)
 
+#include <__system_error/system_error.h>
 #include <limits>
 #include <random>
-#include <system_error>
 
 #if defined(__sun__)
 #   define rename solaris_headers_are_broken
diff --git a/third_party/llvm-project/libcxx/src/ryu/d2fixed.cpp b/third_party/llvm-project/libcxx/src/ryu/d2fixed.cpp
index c1a1f6c..e03f1a7 100644
--- a/third_party/llvm-project/libcxx/src/ryu/d2fixed.cpp
+++ b/third_party/llvm-project/libcxx/src/ryu/d2fixed.cpp
@@ -43,7 +43,6 @@
 #include <__config>
 #include <charconv>
 #include <cstring>
-#include <system_error>
 
 #include "include/ryu/common.h"
 #include "include/ryu/d2fixed.h"
@@ -135,19 +134,19 @@
     __digits /= 10000;
     const uint32_t __c0 = (__c % 100) << 1;
     const uint32_t __c1 = (__c / 100) << 1;
-    _VSTD::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + __olength - __i - 4, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + __olength - __i - 4, __DIGIT_TABLE + __c1, 2);
     __i += 4;
   }
   if (__digits >= 100) {
     const uint32_t __c = (__digits % 100) << 1;
     __digits /= 100;
-    _VSTD::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c, 2);
     __i += 2;
   }
   if (__digits >= 10) {
     const uint32_t __c = __digits << 1;
-    _VSTD::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __olength - __i - 2, __DIGIT_TABLE + __c, 2);
   } else {
     __result[0] = static_cast<char>('0' + __digits);
   }
@@ -164,14 +163,14 @@
     __digits /= 10000;
     const uint32_t __c0 = (__c % 100) << 1;
     const uint32_t __c1 = (__c / 100) << 1;
-    _VSTD::memcpy(__result + __olength + 1 - __i - 2, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + __olength + 1 - __i - 4, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + __olength + 1 - __i - 2, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + __olength + 1 - __i - 4, __DIGIT_TABLE + __c1, 2);
     __i += 4;
   }
   if (__digits >= 100) {
     const uint32_t __c = (__digits % 100) << 1;
     __digits /= 100;
-    _VSTD::memcpy(__result + __olength + 1 - __i - 2, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __olength + 1 - __i - 2, __DIGIT_TABLE + __c, 2);
     __i += 2;
   }
   if (__digits >= 10) {
@@ -190,7 +189,7 @@
   for (; __i < __count - 1; __i += 2) {
     const uint32_t __c = (__digits % 100) << 1;
     __digits /= 100;
-    _VSTD::memcpy(__result + __count - __i - 2, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __count - __i - 2, __DIGIT_TABLE + __c, 2);
   }
   if (__i < __count) {
     const char __c = static_cast<char>('0' + (__digits % 10));
@@ -200,7 +199,7 @@
 
 void __append_nine_digits(uint32_t __digits, char* const __result) {
   if (__digits == 0) {
-    _VSTD::memset(__result, '0', 9);
+    std::memset(__result, '0', 9);
     return;
   }
 
@@ -213,8 +212,8 @@
     __digits /= 10000;
     const uint32_t __c0 = (__c % 100) << 1;
     const uint32_t __c1 = (__c / 100) << 1;
-    _VSTD::memcpy(__result + 7 - __i, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + 5 - __i, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + 7 - __i, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + 5 - __i, __DIGIT_TABLE + __c1, 2);
   }
   __result[0] = static_cast<char>('0' + __digits);
 }
@@ -251,7 +250,7 @@
     *_First++ = '0';
     if (__precision > 0) {
       *_First++ = '.';
-      _VSTD::memset(_First, '0', __precision);
+      std::memset(_First, '0', __precision);
       _First += __precision;
     }
     return { _First, errc{} };
@@ -322,14 +321,14 @@
       if (_Last - _First < static_cast<ptrdiff_t>(__precision)) {
         return { _Last, errc::value_too_large };
       }
-      _VSTD::memset(_First, '0', __precision);
+      std::memset(_First, '0', __precision);
       _First += __precision;
     } else if (__i < __MIN_BLOCK_2[__idx]) {
       __i = __MIN_BLOCK_2[__idx];
       if (_Last - _First < static_cast<ptrdiff_t>(9 * __i)) {
         return { _Last, errc::value_too_large };
       }
-      _VSTD::memset(_First, '0', 9 * __i);
+      std::memset(_First, '0', 9 * __i);
       _First += 9 * __i;
     }
     for (; __i < __blocks; ++__i) {
@@ -342,7 +341,7 @@
         if (_Last - _First < static_cast<ptrdiff_t>(__fill)) {
           return { _Last, errc::value_too_large };
         }
-        _VSTD::memset(_First, '0', __fill);
+        std::memset(_First, '0', __fill);
         _First += __fill;
         break;
       }
@@ -416,7 +415,7 @@
     if (_Last - _First < static_cast<ptrdiff_t>(__precision)) {
       return { _Last, errc::value_too_large };
     }
-    _VSTD::memset(_First, '0', __precision);
+    std::memset(_First, '0', __precision);
     _First += __precision;
   }
   return { _First, errc{} };
@@ -440,10 +439,10 @@
     *_First++ = '0';
     if (__precision > 0) {
       *_First++ = '.';
-      _VSTD::memset(_First, '0', __precision);
+      std::memset(_First, '0', __precision);
       _First += __precision;
     }
-    _VSTD::memcpy(_First, "e+00", 4);
+    std::memcpy(_First, "e+00", 4);
     _First += 4;
     return { _First, errc{} };
   }
@@ -589,7 +588,7 @@
       return { _Last, errc::value_too_large };
     }
     if (__digits == 0) {
-      _VSTD::memset(_First, '0', __maximum);
+      std::memset(_First, '0', __maximum);
     } else {
       __append_c_digits(__maximum, __digits, _First);
     }
@@ -654,11 +653,11 @@
 
   if (__exp >= 100) {
     const int32_t __c = __exp % 10;
-    _VSTD::memcpy(_First, __DIGIT_TABLE + 2 * (__exp / 10), 2);
+    std::memcpy(_First, __DIGIT_TABLE + 2 * (__exp / 10), 2);
     _First[2] = static_cast<char>('0' + __c);
     _First += 3;
   } else {
-    _VSTD::memcpy(_First, __DIGIT_TABLE + 2 * __exp, 2);
+    std::memcpy(_First, __DIGIT_TABLE + 2 * __exp, 2);
     _First += 2;
   }
 
diff --git a/third_party/llvm-project/libcxx/src/ryu/d2s.cpp b/third_party/llvm-project/libcxx/src/ryu/d2s.cpp
index 245c2eb..ede2607 100644
--- a/third_party/llvm-project/libcxx/src/ryu/d2s.cpp
+++ b/third_party/llvm-project/libcxx/src/ryu/d2s.cpp
@@ -527,10 +527,10 @@
       const uint32_t __d0 = (__d % 100) << 1;
       const uint32_t __d1 = (__d / 100) << 1;
 
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __d0, 2);
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __d1, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __d0, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __d1, 2);
     }
     uint32_t __output2 = static_cast<uint32_t>(_Output);
     while (__output2 >= 10000) {
@@ -542,35 +542,35 @@
       __output2 /= 10000;
       const uint32_t __c0 = (__c % 100) << 1;
       const uint32_t __c1 = (__c / 100) << 1;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
     }
     if (__output2 >= 100) {
       const uint32_t __c = (__output2 % 100) << 1;
       __output2 /= 100;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
     }
     if (__output2 >= 10) {
       const uint32_t __c = __output2 << 1;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
     } else {
       *--_Mid = static_cast<char>('0' + __output2);
     }
 
     if (_Ryu_exponent > 0) { // case "172900" with _Can_use_ryu
       // Performance note: it might be more efficient to do this immediately after setting _Mid.
-      _VSTD::memset(_First + __olength, '0', static_cast<size_t>(_Ryu_exponent));
+      std::memset(_First + __olength, '0', static_cast<size_t>(_Ryu_exponent));
     } else if (_Ryu_exponent == 0) { // case "1729"
       // Done!
     } else if (_Whole_digits > 0) { // case "17.29"
       // Performance note: moving digits might not be optimal.
-      _VSTD::memmove(_First, _First + 1, static_cast<size_t>(_Whole_digits));
+      std::memmove(_First, _First + 1, static_cast<size_t>(_Whole_digits));
       _First[_Whole_digits] = '.';
     } else { // case "0.001729"
       // Performance note: a larger memset() followed by overwriting '.' might be more efficient.
       _First[0] = '0';
       _First[1] = '.';
-      _VSTD::memset(_First + 2, '0', static_cast<size_t>(-_Whole_digits));
+      std::memset(_First + 2, '0', static_cast<size_t>(-_Whole_digits));
     }
 
     return { _First + _Total_fixed_length, errc{} };
@@ -602,10 +602,10 @@
     const uint32_t __c1 = (__c / 100) << 1;
     const uint32_t __d0 = (__d % 100) << 1;
     const uint32_t __d1 = (__d / 100) << 1;
-    _VSTD::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
-    _VSTD::memcpy(__result + __olength - __i - 5, __DIGIT_TABLE + __d0, 2);
-    _VSTD::memcpy(__result + __olength - __i - 7, __DIGIT_TABLE + __d1, 2);
+    std::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + __olength - __i - 5, __DIGIT_TABLE + __d0, 2);
+    std::memcpy(__result + __olength - __i - 7, __DIGIT_TABLE + __d1, 2);
     __i += 8;
   }
   uint32_t __output2 = static_cast<uint32_t>(_Output);
@@ -618,14 +618,14 @@
     __output2 /= 10000;
     const uint32_t __c0 = (__c % 100) << 1;
     const uint32_t __c1 = (__c / 100) << 1;
-    _VSTD::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
     __i += 4;
   }
   if (__output2 >= 100) {
     const uint32_t __c = (__output2 % 100) << 1;
     __output2 /= 100;
-    _VSTD::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c, 2);
     __i += 2;
   }
   if (__output2 >= 10) {
@@ -657,11 +657,11 @@
 
   if (_Scientific_exponent >= 100) {
     const int32_t __c = _Scientific_exponent % 10;
-    _VSTD::memcpy(__result + __index, __DIGIT_TABLE + 2 * (_Scientific_exponent / 10), 2);
+    std::memcpy(__result + __index, __DIGIT_TABLE + 2 * (_Scientific_exponent / 10), 2);
     __result[__index + 2] = static_cast<char>('0' + __c);
     __index += 3;
   } else {
-    _VSTD::memcpy(__result + __index, __DIGIT_TABLE + 2 * _Scientific_exponent, 2);
+    std::memcpy(__result + __index, __DIGIT_TABLE + 2 * _Scientific_exponent, 2);
     __index += 2;
   }
 
@@ -713,7 +713,7 @@
         return { _Last, errc::value_too_large };
       }
 
-      _VSTD::memcpy(_First, "0e+00", 5);
+      std::memcpy(_First, "0e+00", 5);
 
       return { _First + 5, errc{} };
     }
diff --git a/third_party/llvm-project/libcxx/src/ryu/f2s.cpp b/third_party/llvm-project/libcxx/src/ryu/f2s.cpp
index 3bcfe46..db93a48 100644
--- a/third_party/llvm-project/libcxx/src/ryu/f2s.cpp
+++ b/third_party/llvm-project/libcxx/src/ryu/f2s.cpp
@@ -565,35 +565,35 @@
       _Output /= 10000;
       const uint32_t __c0 = (__c % 100) << 1;
       const uint32_t __c1 = (__c / 100) << 1;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c0, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c1, 2);
     }
     if (_Output >= 100) {
       const uint32_t __c = (_Output % 100) << 1;
       _Output /= 100;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
     }
     if (_Output >= 10) {
       const uint32_t __c = _Output << 1;
-      _VSTD::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
+      std::memcpy(_Mid -= 2, __DIGIT_TABLE + __c, 2);
     } else {
       *--_Mid = static_cast<char>('0' + _Output);
     }
 
     if (_Ryu_exponent > 0) { // case "172900" with _Can_use_ryu
       // Performance note: it might be more efficient to do this immediately after setting _Mid.
-      _VSTD::memset(_First + __olength, '0', static_cast<size_t>(_Ryu_exponent));
+      std::memset(_First + __olength, '0', static_cast<size_t>(_Ryu_exponent));
     } else if (_Ryu_exponent == 0) { // case "1729"
       // Done!
     } else if (_Whole_digits > 0) { // case "17.29"
       // Performance note: moving digits might not be optimal.
-      _VSTD::memmove(_First, _First + 1, static_cast<size_t>(_Whole_digits));
+      std::memmove(_First, _First + 1, static_cast<size_t>(_Whole_digits));
       _First[_Whole_digits] = '.';
     } else { // case "0.001729"
       // Performance note: a larger memset() followed by overwriting '.' might be more efficient.
       _First[0] = '0';
       _First[1] = '.';
-      _VSTD::memset(_First + 2, '0', static_cast<size_t>(-_Whole_digits));
+      std::memset(_First + 2, '0', static_cast<size_t>(-_Whole_digits));
     }
 
     return { _First + _Total_fixed_length, errc{} };
@@ -617,14 +617,14 @@
     _Output /= 10000;
     const uint32_t __c0 = (__c % 100) << 1;
     const uint32_t __c1 = (__c / 100) << 1;
-    _VSTD::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
-    _VSTD::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
+    std::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c0, 2);
+    std::memcpy(__result + __olength - __i - 3, __DIGIT_TABLE + __c1, 2);
     __i += 4;
   }
   if (_Output >= 100) {
     const uint32_t __c = (_Output % 100) << 1;
     _Output /= 100;
-    _VSTD::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c, 2);
+    std::memcpy(__result + __olength - __i - 1, __DIGIT_TABLE + __c, 2);
     __i += 2;
   }
   if (_Output >= 10) {
@@ -654,7 +654,7 @@
     __result[__index++] = '+';
   }
 
-  _VSTD::memcpy(__result + __index, __DIGIT_TABLE + 2 * _Scientific_exponent, 2);
+  std::memcpy(__result + __index, __DIGIT_TABLE + 2 * _Scientific_exponent, 2);
   __index += 2;
 
   return { _First + _Total_scientific_length, errc{} };
@@ -673,7 +673,7 @@
         return { _Last, errc::value_too_large };
       }
 
-      _VSTD::memcpy(_First, "0e+00", 5);
+      std::memcpy(_First, "0e+00", 5);
 
       return { _First + 5, errc{} };
     }
diff --git a/third_party/llvm-project/libcxx/src/shared_mutex.cpp b/third_party/llvm-project/libcxx/src/shared_mutex.cpp
index 73d4dc1..b1976c1 100644
--- a/third_party/llvm-project/libcxx/src/shared_mutex.cpp
+++ b/third_party/llvm-project/libcxx/src/shared_mutex.cpp
@@ -10,6 +10,7 @@
 
 #ifndef _LIBCPP_HAS_NO_THREADS
 
+#include <mutex>
 #include <shared_mutex>
 #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
 #  pragma comment(lib, "pthread")
diff --git a/third_party/llvm-project/libcxx/include/__std_stream b/third_party/llvm-project/libcxx/src/std_stream.h
similarity index 98%
rename from third_party/llvm-project/libcxx/include/__std_stream
rename to third_party/llvm-project/libcxx/src/std_stream.h
index e419e8c..9c15d7d 100644
--- a/third_party/llvm-project/libcxx/include/__std_stream
+++ b/third_party/llvm-project/libcxx/src/std_stream.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _LIBCPP___STD_STREAM
-#define _LIBCPP___STD_STREAM
+#ifndef _LIBCPP_STD_STREAM_H
+#define _LIBCPP_STD_STREAM_H
 
 #include <__config>
 #include <__locale>
@@ -358,4 +358,4 @@
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP___STD_STREAM
+#endif // _LIBCPP_STD_STREAM_H
diff --git a/third_party/llvm-project/libcxx/src/stdexcept.cpp b/third_party/llvm-project/libcxx/src/stdexcept.cpp
index d08b674..d5c9173 100644
--- a/third_party/llvm-project/libcxx/src/stdexcept.cpp
+++ b/third_party/llvm-project/libcxx/src/stdexcept.cpp
@@ -9,7 +9,6 @@
 #include <new>
 #include <stdexcept>
 #include <string>
-#include <system_error>
 
 #ifdef _LIBCPP_ABI_VCRUNTIME
 #include "support/runtime/stdexcept_vcruntime.ipp"
diff --git a/third_party/llvm-project/libcxx/src/string.cpp b/third_party/llvm-project/libcxx/src/string.cpp
index db211b2..b18dcce 100644
--- a/third_party/llvm-project/libcxx/src/string.cpp
+++ b/third_party/llvm-project/libcxx/src/string.cpp
@@ -63,7 +63,7 @@
 
 template<typename T>
 inline void throw_helper(const string& msg) {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw T(msg);
 #else
     fprintf(stderr, "%s\n", msg.c_str());
diff --git a/third_party/llvm-project/libcxx/src/support/runtime/exception_fallback.ipp b/third_party/llvm-project/libcxx/src/support/runtime/exception_fallback.ipp
index ade9335..3b2716d 100644
--- a/third_party/llvm-project/libcxx/src/support/runtime/exception_fallback.ipp
+++ b/third_party/llvm-project/libcxx/src/support/runtime/exception_fallback.ipp
@@ -51,15 +51,15 @@
 void
 terminate() noexcept
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         (*get_terminate())();
         // handler should not return
         fprintf(stderr, "terminate_handler unexpectedly returned\n");
         ::abort();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -67,7 +67,7 @@
         fprintf(stderr, "terminate_handler unexpectedly threw an exception\n");
         ::abort();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 bool uncaught_exception() noexcept { return uncaught_exceptions() > 0; }
diff --git a/third_party/llvm-project/libcxx/src/support/runtime/exception_msvc.ipp b/third_party/llvm-project/libcxx/src/support/runtime/exception_msvc.ipp
index 7e36c70..0114d5a 100644
--- a/third_party/llvm-project/libcxx/src/support/runtime/exception_msvc.ipp
+++ b/third_party/llvm-project/libcxx/src/support/runtime/exception_msvc.ipp
@@ -57,15 +57,15 @@
 _LIBCPP_NORETURN
 void terminate() noexcept
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     try
     {
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
         (*get_terminate())();
         // handler should not return
         fprintf(stderr, "terminate_handler unexpectedly returned\n");
         ::abort();
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     }
     catch (...)
     {
@@ -73,7 +73,7 @@
         fprintf(stderr, "terminate_handler unexpectedly threw an exception\n");
         ::abort();
     }
-#endif // _LIBCPP_NO_EXCEPTIONS
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
 }
 
 bool uncaught_exception() noexcept { return uncaught_exceptions() > 0; }
diff --git a/third_party/llvm-project/libcxx/src/support/solaris/README b/third_party/llvm-project/libcxx/src/support/solaris/README.txt
similarity index 100%
rename from third_party/llvm-project/libcxx/src/support/solaris/README
rename to third_party/llvm-project/libcxx/src/support/solaris/README.txt
diff --git a/third_party/llvm-project/libcxx/src/system_error.cpp b/third_party/llvm-project/libcxx/src/system_error.cpp
index ba5fa8f..190abfd 100644
--- a/third_party/llvm-project/libcxx/src/system_error.cpp
+++ b/third_party/llvm-project/libcxx/src/system_error.cpp
@@ -286,7 +286,7 @@
 void
 __throw_system_error(int ev, const char* what_arg)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
     throw system_error(error_code(ev, system_category()), what_arg);
 #else
     (void)ev;
diff --git a/third_party/llvm-project/libcxx/test/.clang-format b/third_party/llvm-project/libcxx/test/.clang-format
new file mode 100644
index 0000000..b446ff7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/.clang-format
@@ -0,0 +1,5 @@
+BasedOnStyle: InheritParentConfig
+
+# Disable formatting options which may break tests.
+SortIncludes: false
+ReflowComments: false
diff --git a/third_party/llvm-project/libcxx/test/configs/apple-libc++-backdeployment.cfg.in b/third_party/llvm-project/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
index 6c2e70f..b471c02 100644
--- a/third_party/llvm-project/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
@@ -7,7 +7,7 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig, libcxx.test.dsl
+import libcxx.test.params, libcxx.test.config, libcxx.test.dsl
 
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
 
@@ -54,7 +54,9 @@
     '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}:%{unwind-runtime-root}" -- '
 ))
 
-libcxx.test.newconfig.configure(
+config.stdlib = 'apple-libc++'
+
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS + BACKDEPLOYMENT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/apple-libc++-shared.cfg.in b/third_party/llvm-project/libcxx/test/configs/apple-libc++-shared.cfg.in
index 71c4a9e..af1926e 100644
--- a/third_party/llvm-project/libcxx/test/configs/apple-libc++-shared.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/apple-libc++-shared.cfg.in
@@ -22,10 +22,12 @@
     '%{executor} --execdir %T --env DYLD_LIBRARY_PATH=%{lib} -- '
 ))
 
+config.stdlib = 'apple-libc++'
+
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/ibm-libc++-shared.cfg.in b/third_party/llvm-project/libcxx/test/configs/ibm-libc++-shared.cfg.in
index fb65bf6..a93b308 100644
--- a/third_party/llvm-project/libcxx/test/configs/ibm-libc++-shared.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/ibm-libc++-shared.cfg.in
@@ -24,8 +24,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-mingw.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-mingw.cfg.in
index 0cb6793..449b030 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-mingw.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-mingw.cfg.in
@@ -16,8 +16,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-clangcl.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-clangcl.cfg.in
index e8f1fc3..3814bd4 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-clangcl.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-clangcl.cfg.in
@@ -16,8 +16,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
index f071bf7..eeeafcf 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-gcc.cfg.in
@@ -17,8 +17,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-no-vcruntime-clangcl.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-no-vcruntime-clangcl.cfg.in
index c6ddfb7..bdaa834 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-no-vcruntime-clangcl.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared-no-vcruntime-clangcl.cfg.in
@@ -17,8 +17,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared.cfg.in
index 7228c7e..eb86b88 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-shared.cfg.in
@@ -18,8 +18,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static-clangcl.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static-clangcl.cfg.in
index 460f7d6..6093ad5 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static-clangcl.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static-clangcl.cfg.in
@@ -16,8 +16,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static.cfg.in b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static.cfg.in
index bdbcb0b..8b66a12 100644
--- a/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static.cfg.in
+++ b/third_party/llvm-project/libcxx/test/configs/llvm-libc++-static.cfg.in
@@ -18,8 +18,8 @@
 
 import os, site
 site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
-import libcxx.test.params, libcxx.test.newconfig
-libcxx.test.newconfig.configure(
+import libcxx.test.params, libcxx.test.config
+libcxx.test.config.configure(
     libcxx.test.params.DEFAULT_PARAMETERS,
     libcxx.test.features.DEFAULT_FEATURES,
     config,
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
index fc58955..057f126 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
@@ -35,12 +35,9 @@
 };
 
 
-int main(int, char**)
-{
+void f() {
     int v[1] = {1};
     std::random_shuffle(&v[0], &v[1]); // expected-warning {{'random_shuffle<int *>' is deprecated}}
     gen r;
     std::random_shuffle(&v[0], &v[1], r); // expected-warning {{'random_shuffle<int *, gen &>' is deprecated}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_nontrivial.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_nontrivial.pass.cpp
index c26f755..3cbe04f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_nontrivial.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_nontrivial.pass.cpp
@@ -26,7 +26,7 @@
 // This template is a better match than the actual `builtin_memmove` (it can match the pointer type exactly, without an
 // implicit conversion to `void*`), so it should hijack the call inside `std::copy` and similar algorithms if it's made.
 template <class Dst, class Src>
-constexpr void* __builtin_memmove(Dst*, Src*, size_t) {
+constexpr void* __builtin_memmove(Dst*, Src*, std::size_t) {
   assert(false);
   return nullptr;
 }
@@ -172,7 +172,7 @@
   using To = typename std::iterator_traits<OutIter>::value_type;
 
   {
-    const size_t N = 5;
+    const std::size_t N = 5;
 
     From input[N] = {make<From>(0), make<From>(1), make<From>(2), make<From>(3), make<From>(4)};
     To output[N];
@@ -192,7 +192,7 @@
   }
 
   {
-    const size_t N = 0;
+    const std::size_t N = 0;
 
     From input[1]  = {make<From>(1)};
     To output[1] = {make<To>(2)};
@@ -211,25 +211,25 @@
 constexpr void test_copy() {
   // Classic.
   if constexpr (std::same_as<InIter, SentWrapper<InIter>>) {
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
       std::copy(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
       std::copy_backward(first, last, out + n);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, std::size_t n) {
       std::copy_n(first, n, out);
     });
   }
 
   // Ranges.
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::copy(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::copy_backward(first, last, out + n);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, std::size_t n) {
     std::ranges::copy_n(first, n, out);
   });
 }
@@ -237,19 +237,19 @@
 template <class InIter, template <class> class SentWrapper, class OutIter>
 constexpr void test_move() {
   if constexpr (std::same_as<InIter, SentWrapper<InIter>>) {
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
       std::move(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
       std::move_backward(first, last, out + n);
     });
   }
 
   // Ranges.
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::move(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::move_backward(first, last, out + n);
   });
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_trivial.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_trivial.pass.cpp
index 7505e57..7c2d388 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_trivial.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_trivial.pass.cpp
@@ -36,7 +36,7 @@
 // This template is a better match than the actual `builtin_memmove` (it can match the pointer type exactly, without an
 // implicit conversion to `void*`), so it should hijack the call inside `std::copy` and similar algorithms if it's made.
 template <class Dst, class Src>
-constexpr void* __builtin_memmove(Dst* dst, Src* src, size_t count) {
+constexpr void* __builtin_memmove(Dst* dst, Src* src, std::size_t count) {
   memmove_called = true;
   return __builtin_memmove(static_cast<void*>(dst), static_cast<const void*>(src), count);
 }
@@ -135,7 +135,7 @@
 
   // Normal case.
   {
-    const size_t N = 4;
+    const std::size_t N = 4;
 
     From input[N] = {make<From>(1), make<From>(2), make<From>(3), make<From>(4)};
     To output[N];
@@ -162,7 +162,7 @@
 
   // Empty input sequence.
   {
-    const size_t N = 0;
+    const std::size_t N = 0;
 
     From input[1]  = {make<From>(1)};
     To output[1] = {make<To>(2)};
@@ -185,37 +185,37 @@
 void test_copy_and_move() {
   // Classic.
   if constexpr (std::same_as<InIter, SentWrapper<InIter>>) {
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
       std::copy(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
       std::copy_backward(first, last, out + n);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, std::size_t n) {
       std::copy_n(first, n, out);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
       std::move(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
       std::move_backward(first, last, out + n);
     });
   }
 
   // Ranges.
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::copy(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::copy_backward(first, last, out + n);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto, auto out, std::size_t n) {
     std::ranges::copy_n(first, n, out);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::move(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::move_backward(first, last, out + n);
   });
 }
@@ -281,36 +281,36 @@
     }
   };
 
-  check([](auto first, auto last, auto out, size_t) {
+  check([](auto first, auto last, auto out, std::size_t) {
     std::copy(first, last, out);
   });
-  check([](auto first, auto last, auto out, size_t n) {
+  check([](auto first, auto last, auto out, std::size_t n) {
     std::copy_backward(first, last, out + n);
   });
-  check([](auto first, auto, auto out, size_t n) {
+  check([](auto first, auto, auto out, std::size_t n) {
     std::copy_n(first, n, out);
   });
-  check([](auto first, auto last, auto out, size_t) {
+  check([](auto first, auto last, auto out, std::size_t) {
     std::move(first, last, out);
   });
-  check([](auto first, auto last, auto out, size_t n) {
+  check([](auto first, auto last, auto out, std::size_t n) {
     std::move_backward(first, last, out + n);
   });
 
   // Ranges.
-  check([](auto first, auto last, auto out, size_t) {
+  check([](auto first, auto last, auto out, std::size_t) {
     std::ranges::copy(first, last, out);
   });
-  check([](auto first, auto last, auto out, size_t n) {
+  check([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::copy_backward(first, last, out + n);
   });
-  check([](auto first, auto, auto out, size_t n) {
+  check([](auto first, auto, auto out, std::size_t n) {
     std::ranges::copy_n(first, n, out);
   });
-  check([](auto first, auto last, auto out, size_t) {
+  check([](auto first, auto last, auto out, std::size_t) {
     std::ranges::move(first, last, out);
   });
-  check([](auto first, auto last, auto out, size_t n) {
+  check([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::move_backward(first, last, out + n);
   });
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_unwrap_reverse.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_unwrap_reverse.pass.cpp
index bb01cc4..f295b80 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_unwrap_reverse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.modifying.operations/copy_move_unwrap_reverse.pass.cpp
@@ -22,13 +22,13 @@
 
 #include "test_iterators.h"
 
-template <size_t N, class Iter>
+template <std::size_t N, class Iter>
 requires (N == 0)
 constexpr auto wrap_n_times(Iter i) {
   return i;
 }
 
-template <size_t N, class Iter>
+template <std::size_t N, class Iter>
 requires (N != 0)
 constexpr auto wrap_n_times(Iter i) {
   return std::make_reverse_iterator(wrap_n_times<N - 1>(i));
@@ -37,12 +37,12 @@
 static_assert(std::is_same_v<decltype(wrap_n_times<2>(std::declval<int*>())),
                              std::reverse_iterator<std::reverse_iterator<int*>>>);
 
-template <class InIter, template <class> class SentWrapper, class OutIter, size_t W1, size_t W2, class Func>
+template <class InIter, template <class> class SentWrapper, class OutIter, std::size_t W1, size_t W2, class Func>
 constexpr void test_one(Func func) {
   using From = std::iter_value_t<InIter>;
   using To = std::iter_value_t<OutIter>;
 
-  const size_t N = 4;
+  const std::size_t N = 4;
 
   From input[N] = {{1}, {2}, {3}, {4}};
   To output[N];
@@ -60,46 +60,46 @@
     }));
 }
 
-template <class InIter, template <class> class SentWrapper, class OutIter, size_t W1, size_t W2>
+template <class InIter, template <class> class SentWrapper, class OutIter, std::size_t W1, size_t W2>
 constexpr void test_copy_and_move() {
   // Classic.
   if constexpr (std::same_as<InIter, SentWrapper<InIter>>) {
-    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t) {
       std::copy(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t n) {
       std::copy_backward(first, last, out + n);
     });
-    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto, auto out, std::size_t n) {
       std::copy_n(first, n, out);
     });
-    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t) {
+    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t) {
       std::move(first, last, out);
     });
-    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t n) {
+    test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t n) {
       std::move_backward(first, last, out + n);
     });
   }
 
   // Ranges.
-  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::copy(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::copy_backward(first, last, out + n);
   });
-  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto, auto out, std::size_t n) {
     std::ranges::copy_n(first, n, out);
   });
-  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t) {
+  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t) {
     std::ranges::move(first, last, out);
   });
-  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, size_t n) {
+  test_one<InIter, SentWrapper, OutIter, W1, W2>([](auto first, auto last, auto out, std::size_t n) {
     std::ranges::move_backward(first, last, out + n);
   });
 }
 
-template <size_t W1, size_t W2, class From, class To, template <class> class SentWrapper>
+template <std::size_t W1, size_t W2, class From, class To, template <class> class SentWrapper>
 constexpr void test_all_permutations_with_counts_from_to_sent() {
   test_copy_and_move<From*, SentWrapper, To*, W1, W2>();
   test_copy_and_move<contiguous_iterator<From*>, SentWrapper, To*, W1, W2>();
@@ -114,7 +114,7 @@
   }
 }
 
-template <size_t W1, size_t W2>
+template <std::size_t W1, size_t W2>
 constexpr void test_all_permutations_with_counts() {
   test_all_permutations_with_counts_from_to_sent<W1, W2, int, int, std::type_identity_t>();
   test_all_permutations_with_counts_from_to_sent<W1, W2, int, int, sized_sentinel>();
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
index 47b3c77..bb8dccc 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
@@ -10,7 +10,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <algorithm>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_less.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_less.pass.cpp
index 89f12e5..6085aa9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_less.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_less.pass.cpp
@@ -206,10 +206,10 @@
 
 struct ValueIterator {
     typedef std::input_iterator_tag iterator_category;
-    typedef size_t value_type;
-    typedef ptrdiff_t difference_type;
-    typedef size_t reference;
-    typedef size_t* pointer;
+    typedef std::size_t value_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef std::size_t reference;
+    typedef std::size_t* pointer;
 
     ValueIterator() { }
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_three_way_comp.inconsistent.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_three_way_comp.inconsistent.pass.cpp
new file mode 100644
index 0000000..eb2a483
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/debug_three_way_comp.inconsistent.pass.cpp
@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// template <class _Comp> struct __debug_three_way_comp
+
+// Make sure __debug_three_way_comp asserts when the comparator is not consistent.
+
+// UNSUPPORTED: !libcpp-has-debug-mode, c++03, c++11, c++14, c++17
+
+#include <algorithm>
+#include <iterator>
+
+#include "check_assertion.h"
+
+struct AlwaysLess {
+  std::strong_ordering operator()(int, int) const { return std::strong_ordering::less; }
+};
+
+struct AlwaysGreater {
+  std::strong_ordering operator()(int, int) const { return std::strong_ordering::greater; }
+};
+
+struct InconsistentEquals {
+  std::strong_ordering operator()(int a, int) const {
+    if (a == 0)
+      return std::strong_ordering::equal;
+    return std::strong_ordering::greater;
+  }
+};
+
+int main(int, char**) {
+  int zero = 0;
+  int one  = 1;
+
+  AlwaysLess alwaysLess;
+  std::__debug_three_way_comp<AlwaysLess> debugAlwaysLess(alwaysLess);
+  TEST_LIBCPP_ASSERT_FAILURE(debugAlwaysLess(zero, one), "Comparator does not induce a strict weak ordering");
+
+  AlwaysGreater alwaysGreater;
+  std::__debug_three_way_comp<AlwaysGreater> debugAlwaysGreater(alwaysGreater);
+  TEST_LIBCPP_ASSERT_FAILURE(debugAlwaysGreater(zero, one), "Comparator does not induce a strict weak ordering");
+
+  InconsistentEquals inconsistentEquals;
+  std::__debug_three_way_comp<InconsistentEquals> debugInconsistentEquals(inconsistentEquals);
+  TEST_LIBCPP_ASSERT_FAILURE(debugInconsistentEquals(zero, one), "Comparator does not induce a strict weak ordering");
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/half_positive.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/half_positive.pass.cpp
index 9976796..82d18cb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/half_positive.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/half_positive.pass.cpp
@@ -35,7 +35,7 @@
         assert(test<int>());
         assert(test<long>());
         assert((test<UserDefinedIntegral<int>, int>()));
-        assert(test<size_t>());
+        assert(test<std::size_t>());
 #if !defined(TEST_HAS_NO_INT128)
         assert(test<__int128_t>());
 #endif // !defined(TEST_HAS_NO_INT128)
@@ -46,7 +46,7 @@
         static_assert(test<char>(), "");
         static_assert(test<int>(), "");
         static_assert(test<long>(), "");
-        static_assert(test<size_t>(), "");
+        static_assert(test<std::size_t>(), "");
 #if !defined(TEST_HAS_NO_INT128)
         static_assert(test<__int128_t>(), "");
 #endif // !defined(TEST_HAS_NO_INT128)
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/lifetimebound.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/lifetimebound.verify.cpp
new file mode 100644
index 0000000..b16ecfb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/lifetimebound.verify.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+// ADDITIONAL_COMPILE_FLAGS: -Wno-pessimizing-move -Wno-unused-variable
+
+#include <algorithm>
+
+#include "test_macros.h"
+
+struct Comp {
+  template <class T, class U>
+  bool operator()(T, U) {
+    return false;
+  }
+};
+
+void func() {
+  int i = 0;
+  {
+    auto&& v1 = std::min(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::min(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::min(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::min(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+  }
+  {
+    auto&& v1 = std::max(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::max(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::max(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::max(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+  }
+  {
+    auto&& v1 = std::minmax(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::minmax(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::minmax(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::minmax(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+    auto v5 = std::minmax(0, i);           // expected-warning {{temporary whose address is used as value of local variable 'v5' will be destroyed at the end of the full-expression}}
+    auto v6 = std::minmax(i, 0);           // expected-warning {{temporary whose address is used as value of local variable 'v6' will be destroyed at the end of the full-expression}}
+    auto v7 = std::minmax(0, i, Comp{});   // expected-warning {{temporary whose address is used as value of local variable 'v7' will be destroyed at the end of the full-expression}}
+    auto v8 = std::minmax(i, 0, Comp{});   // expected-warning {{temporary whose address is used as value of local variable 'v8' will be destroyed at the end of the full-expression}}
+  }
+#if TEST_STD_VER >= 20
+  {
+    auto&& v1 = std::ranges::min(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::ranges::min(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::ranges::min(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::ranges::min(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+  }
+  {
+    auto&& v1 = std::ranges::max(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::ranges::max(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::ranges::max(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::ranges::max(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+  }
+  {
+    auto&& v1 = std::ranges::minmax(0, i);         // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+    auto&& v2 = std::ranges::minmax(i, 0);         // expected-warning {{temporary bound to local reference 'v2' will be destroyed at the end of the full-expression}}
+    auto&& v3 = std::ranges::minmax(0, i, Comp{}); // expected-warning {{temporary bound to local reference 'v3' will be destroyed at the end of the full-expression}}
+    auto&& v4 = std::ranges::minmax(i, 0, Comp{}); // expected-warning {{temporary bound to local reference 'v4' will be destroyed at the end of the full-expression}}
+    auto v5 = std::ranges::minmax(0, i);           // expected-warning {{temporary whose address is used as value of local variable 'v5' will be destroyed at the end of the full-expression}}
+    auto v6 = std::ranges::minmax(i, 0);           // expected-warning {{temporary whose address is used as value of local variable 'v6' will be destroyed at the end of the full-expression}}
+    auto v7 = std::ranges::minmax(0, i, Comp{});   // expected-warning {{temporary whose address is used as value of local variable 'v7' will be destroyed at the end of the full-expression}}
+    auto v8 = std::ranges::minmax(i, 0, Comp{});   // expected-warning {{temporary whose address is used as value of local variable 'v8' will be destroyed at the end of the full-expression}}
+  }
+#endif // TEST_STD_VER >= 20
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_copying_comparators.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_copying_comparators.pass.cpp
index 0f50d1c..307610d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_copying_comparators.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_copying_comparators.pass.cpp
@@ -79,12 +79,13 @@
 };
 
 #if TEST_STD_VER > 17
+template <class T>
 struct ThreeWay {
     int *copies_;
     constexpr explicit ThreeWay(int *copies) : copies_(copies) {}
     constexpr ThreeWay(const ThreeWay& rhs) : copies_(rhs.copies_) { *copies_ += 1; }
     constexpr ThreeWay& operator=(const ThreeWay&) = default;
-    constexpr std::strong_ordering operator()(void*, void*) const { return std::strong_ordering::equal; }
+    constexpr std::strong_ordering operator()(T, T) const { return std::strong_ordering::equal; }
 };
 #endif
 
@@ -142,7 +143,7 @@
     if (!TEST_IS_CONSTANT_EVALUATED) { (void)std::inplace_merge(first, mid, last, Less<T>(&copies)); assert(copies == 0); }
     (void)std::lexicographical_compare(first, last, first2, last2, Less<T>(&copies)); assert(copies == 0);
 #if TEST_STD_VER > 17
-    //(void)std::lexicographical_compare_three_way(first, last, first2, last2, ThreeWay(&copies)); assert(copies == 0);
+    (void)std::lexicographical_compare_three_way(first, last, first2, last2, ThreeWay<T>(&copies)); assert(copies == 0);
 #endif
     (void)std::lower_bound(first, last, value, Less<T>(&copies)); assert(copies == 0);
     (void)std::make_heap(first, last, Less<T>(&copies)); assert(copies == 0);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_cpp20_hostile_iterators.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_cpp20_hostile_iterators.compile.pass.cpp
index a7ddf22..78a5863 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_cpp20_hostile_iterators.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/robust_against_cpp20_hostile_iterators.compile.pass.cpp
@@ -138,6 +138,10 @@
   (void) std::is_sorted(it, it, pred);
   (void) std::lexicographical_compare(it, it, it, it);
   (void) std::lexicographical_compare(it, it, it, it, pred);
+#if TEST_STD_VER > 17
+  (void)std::lexicographical_compare_three_way(it, it, it, it);
+  (void)std::lexicographical_compare_three_way(it, it, it, it, std::compare_three_way());
+#endif
   (void) std::lower_bound(it, it, 0);
   (void) std::lower_bound(it, it, 0, pred);
   (void) std::make_heap(it, it);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/sort_stability.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/algorithms/sort_stability.pass.cpp
index 664ea70..712f12c2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/sort_stability.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/algorithms/sort_stability.pass.cpp
@@ -34,7 +34,8 @@
   for (int i = 0; i < kSize; ++i) {
     v[i].value = kSize / 2 - i * (i % 2 ? -1 : 1);
   }
-  std::__sort(v.begin(), v.end(), std::less<EqualType>());
+  std::less<EqualType> comp;
+  std::__sort_dispatch<std::_ClassicAlgPolicy>(v.begin(), v.end(), comp);
   return v;
 }
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
index c0422dc..233e974 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
@@ -12,7 +12,7 @@
 
 // We flag uses of the verbose termination function in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 
 #include <cstdlib>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/assertions/deprecated-link-time-custom-handler.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/assertions/deprecated-link-time-custom-handler.pass.cpp
index b699a3d..9365bd2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/assertions/deprecated-link-time-custom-handler.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/assertions/deprecated-link-time-custom-handler.pass.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: availability-verbose_abort-missing
+
 // Make sure that we still support _LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED for folks
 // who customize the verbose termination function at link-time in back-deployment environments.
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/assertions/headers_declare_verbose_abort.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/assertions/headers_declare_verbose_abort.sh.cpp
index 80f3f25..7eb8acb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/assertions/headers_declare_verbose_abort.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/assertions/headers_declare_verbose_abort.sh.cpp
@@ -10,8 +10,7 @@
 // is required for users to be able to include any public header and then override
 // the function using a strong definition.
 
-// The system-provided <uchar.h> seems to be broken on AIX, which trips up this test.
-// XFAIL: LIBCXX-AIX-FIXME
+// XFAIL: availability-verbose_abort-missing
 
 /*
 BEGIN-SCRIPT
@@ -658,126 +657,108 @@
 
 // RUN: %{build} -DTEST_122
 #if defined(TEST_122) && __cplusplus >= 201103L
-#   include <experimental/algorithm>
+#   include <experimental/deque>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_123
-#if defined(TEST_123) && __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
+#if defined(TEST_123) && __cplusplus >= 201103L
+#   include <experimental/forward_list>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_124
 #if defined(TEST_124) && __cplusplus >= 201103L
-#   include <experimental/deque>
+#   include <experimental/iterator>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_125
 #if defined(TEST_125) && __cplusplus >= 201103L
-#   include <experimental/forward_list>
+#   include <experimental/list>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_126
 #if defined(TEST_126) && __cplusplus >= 201103L
-#   include <experimental/functional>
+#   include <experimental/map>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_127
 #if defined(TEST_127) && __cplusplus >= 201103L
-#   include <experimental/iterator>
+#   include <experimental/memory_resource>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_128
 #if defined(TEST_128) && __cplusplus >= 201103L
-#   include <experimental/list>
+#   include <experimental/propagate_const>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_129
-#if defined(TEST_129) && __cplusplus >= 201103L
-#   include <experimental/map>
+#if defined(TEST_129) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && __cplusplus >= 201103L
+#   include <experimental/regex>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_130
 #if defined(TEST_130) && __cplusplus >= 201103L
-#   include <experimental/memory_resource>
+#   include <experimental/set>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_131
 #if defined(TEST_131) && __cplusplus >= 201103L
-#   include <experimental/propagate_const>
+#   include <experimental/simd>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_132
-#if defined(TEST_132) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && __cplusplus >= 201103L
-#   include <experimental/regex>
+#if defined(TEST_132) && __cplusplus >= 201103L
+#   include <experimental/string>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_133
 #if defined(TEST_133) && __cplusplus >= 201103L
-#   include <experimental/set>
+#   include <experimental/type_traits>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_134
 #if defined(TEST_134) && __cplusplus >= 201103L
-#   include <experimental/simd>
+#   include <experimental/unordered_map>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_135
 #if defined(TEST_135) && __cplusplus >= 201103L
-#   include <experimental/string>
+#   include <experimental/unordered_set>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_136
 #if defined(TEST_136) && __cplusplus >= 201103L
-#   include <experimental/type_traits>
+#   include <experimental/utility>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_137
 #if defined(TEST_137) && __cplusplus >= 201103L
-#   include <experimental/unordered_map>
-    using HandlerType = decltype(std::__libcpp_verbose_abort);
-#endif
-
-// RUN: %{build} -DTEST_138
-#if defined(TEST_138) && __cplusplus >= 201103L
-#   include <experimental/unordered_set>
-    using HandlerType = decltype(std::__libcpp_verbose_abort);
-#endif
-
-// RUN: %{build} -DTEST_139
-#if defined(TEST_139) && __cplusplus >= 201103L
-#   include <experimental/utility>
-    using HandlerType = decltype(std::__libcpp_verbose_abort);
-#endif
-
-// RUN: %{build} -DTEST_140
-#if defined(TEST_140) && __cplusplus >= 201103L
 #   include <experimental/vector>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
-// RUN: %{build} -DTEST_141
-#if defined(TEST_141)
+// RUN: %{build} -DTEST_138
+#if defined(TEST_138)
 #   include <ext/hash_map>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
-// RUN: %{build} -DTEST_142
-#if defined(TEST_142)
+// RUN: %{build} -DTEST_139
+#if defined(TEST_139)
 #   include <ext/hash_set>
     using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp
index e99af02..495d02f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp
@@ -37,6 +37,7 @@
 
 #include <atomic>
 #include <cassert>
+#include <cstddef>
 
 template <typename T>
 struct atomic_test : public std::__atomic_base<T> {
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.verify.cpp
index ca6f006..9ba2fc9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.verify.cpp
@@ -18,12 +18,12 @@
 void void_pointer() {
   {
     volatile std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_add(&obj, 0);
   }
   {
     std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_add(&obj, 0);
   }
 }
@@ -33,12 +33,12 @@
 void pointer_to_incomplete_type() {
   {
     volatile std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_add(&obj, 0);
   }
   {
     std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_add(&obj, 0);
   }
 }
@@ -46,12 +46,12 @@
 void function_pointer() {
   {
     volatile std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_add(&fun, 0);
   }
   {
     std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_add(&fun, 0);
   }
 }
@@ -63,12 +63,12 @@
 void member_function_pointer() {
   {
     volatile std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_add' in}}
+    // expected-error@*:* {{no member named 'fetch_add' in}}
     std::atomic_fetch_add(&fun, 0);
   }
   {
     std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_add' in}}
+    // expected-error@*:* {{no member named 'fetch_add' in}}
     std::atomic_fetch_add(&fun, 0);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.verify.cpp
index 773dbc7..afcd995 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.verify.cpp
@@ -21,12 +21,12 @@
 void void_pointer() {
   {
     volatile std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_add_explicit(&obj, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_add_explicit(&obj, 0, std::memory_order_relaxed);
   }
 }
@@ -36,12 +36,12 @@
 void pointer_to_incomplete_type() {
   {
     volatile std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_add_explicit(&obj, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_add_explicit(&obj, 0, std::memory_order_relaxed);
   }
 }
@@ -49,12 +49,12 @@
 void function_pointer() {
   {
     volatile std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_add_explicit(&fun, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_add_explicit(&fun, 0, std::memory_order_relaxed);
   }
 }
@@ -66,12 +66,12 @@
 void member_function_pointer() {
   {
     volatile std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_add' in}}
+    // expected-error@*:* {{no member named 'fetch_add' in}}
     std::atomic_fetch_add_explicit(&fun, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_add' in}}
+    // expected-error@*:* {{no member named 'fetch_add' in}}
     std::atomic_fetch_add_explicit(&fun, 0, std::memory_order_relaxed);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.verify.cpp
index c2cf156..f179bd0 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.verify.cpp
@@ -18,12 +18,12 @@
 void void_pointer() {
   {
     volatile std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_sub(&obj, 0);
   }
   {
     std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_sub(&obj, 0);
   }
 }
@@ -33,12 +33,12 @@
 void pointer_to_incomplete_type() {
   {
     volatile std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_sub(&obj, 0);
   }
   {
     std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_sub(&obj, 0);
   }
 }
@@ -46,12 +46,12 @@
 void function_pointer() {
   {
     volatile std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_sub(&fun, 0);
   }
   {
     std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_sub(&fun, 0);
   }
 }
@@ -63,12 +63,12 @@
 void member_function_pointer() {
   {
     volatile std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_sub' in}}
+    // expected-error@*:* {{no member named 'fetch_sub' in}}
     std::atomic_fetch_sub(&fun, 0);
   }
   {
     std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_sub' in}}
+    // expected-error@*:* {{no member named 'fetch_sub' in}}
     std::atomic_fetch_sub(&fun, 0);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.verify.cpp
index 73c2b96..bbab767 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.verify.cpp
@@ -21,12 +21,12 @@
 void void_pointer() {
   {
     volatile std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_sub_explicit(&obj, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void*> obj;
-    // expected-error@atomic:* {{incomplete type 'void' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'void' where a complete type is required}}
     std::atomic_fetch_sub_explicit(&obj, 0, std::memory_order_relaxed);
   }
 }
@@ -36,12 +36,12 @@
 void pointer_to_incomplete_type() {
   {
     volatile std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_sub_explicit(&obj, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<Incomplete*> obj;
-    // expected-error@atomic:* {{incomplete type 'Incomplete' where a complete type is required}}
+    // expected-error@*:* {{incomplete type 'Incomplete' where a complete type is required}}
     std::atomic_fetch_sub_explicit(&obj, 0, std::memory_order_relaxed);
   }
 }
@@ -49,12 +49,12 @@
 void function_pointer() {
   {
     volatile std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_sub_explicit(&fun, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void (*)(int)> fun;
-    // expected-error-re@atomic:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
+    // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}}
     std::atomic_fetch_sub_explicit(&fun, 0, std::memory_order_relaxed);
   }
 }
@@ -66,12 +66,12 @@
 void member_function_pointer() {
   {
     volatile std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_sub' in}}
+    // expected-error@*:* {{no member named 'fetch_sub' in}}
     std::atomic_fetch_sub_explicit(&fun, 0, std::memory_order_relaxed);
   }
   {
     std::atomic<void (S::*)(int)> fun;
-    // expected-error@atomic:* {{no member named 'fetch_sub' in}}
+    // expected-error@*:* {{no member named 'fetch_sub' in}}
     std::atomic_fetch_sub_explicit(&fun, 0, std::memory_order_relaxed);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/bit-int.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/bit-int.verify.cpp
index fc6a529..209ec71 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/bit-int.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/bit-int.verify.cpp
@@ -18,10 +18,7 @@
 
 #include <atomic>
 
-int main(int, char**)
-{
-  // expected-error@atomic:*1 {{_Atomic cannot be applied to integer type '_BitInt(32)'}}
+void f() {
+  // expected-error@*:*1 {{_Atomic cannot be applied to integer type '_BitInt(32)'}}
   std::atomic<_BitInt(32)> x(42);
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/atomics/diagnose_invalid_memory_order.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/atomics/diagnose_invalid_memory_order.verify.cpp
index 3eb4cab..a6c1160 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/atomics/diagnose_invalid_memory_order.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/atomics/diagnose_invalid_memory_order.verify.cpp
@@ -18,7 +18,7 @@
 
 #include <atomic>
 
-int main(int, char**) {
+void f() {
     std::atomic<int> x(42);
     volatile std::atomic<int>& vx = x;
     int val1 = 1; ((void)val1);
@@ -123,6 +123,4 @@
         std::atomic_compare_exchange_strong_explicit(&x, &val1, val2, std::memory_order_seq_cst, std::memory_order_acquire);
         std::atomic_compare_exchange_strong_explicit(&x, &val1, val2, std::memory_order_seq_cst, std::memory_order_seq_cst);
     }
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/clang_tidy.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/clang_tidy.sh.cpp
index 57cabf3..74df7af 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/clang_tidy.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/clang_tidy.sh.cpp
@@ -215,21 +215,12 @@
 #   include <wctype.h>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/algorithm>
-#endif
-#if __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/deque>
 #endif
 #if __cplusplus >= 201103L
 #   include <experimental/forward_list>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/functional>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/iterator>
 #endif
 #if __cplusplus >= 201103L
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.incomplete.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.incomplete.verify.cpp
index eb4d4cf..3f7086f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.incomplete.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.incomplete.verify.cpp
@@ -17,9 +17,6 @@
 #include <map>
 #include <functional>
 
-#include "test_macros.h"
-
-
 template <template <typename ...> class Container>
 void test_set() {
   struct KeyBase { };
@@ -48,12 +45,10 @@
   C c;
 }
 
-int main(int, char**) {
+void f() {
   // expected-no-diagnostics
   test_set<std::set>();
   test_set<std::multiset>();
   test_map<std::map>();
   test_map<std::multimap>();
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
index 61cdc2f..3bb59f1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
@@ -23,7 +23,7 @@
   }
 };
 
-int main(int, char**) {
+void f() {
   static_assert(!std::__invokable<BadCompare const&, int const&, int const&>::value, "");
   static_assert(std::__invokable<BadCompare&, int const&, int const&>::value, "");
 
@@ -45,6 +45,4 @@
     using C = std::multimap<long, int, BadCompare>;
     C s;
   }
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
index 5fd6204..467f6cd 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::back() triggers an assertion
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
index 4952713..a0045e1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::back() triggers an assertion
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
index 1bd7582..a114fb7 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::operator[] triggers an assertion
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
index 9cbe7c5..7537053 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <deque>
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/segmented_iterator.compile.pass.cpp
similarity index 71%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/segmented_iterator.compile.pass.cpp
index 92dc58c..27100f9 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/segmented_iterator.compile.pass.cpp
@@ -6,16 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
+#include <deque>
 
-#include <complex.h>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
-
-  return 0;
-}
+using DequeIterator = typename std::deque<int>::iterator;
+static_assert(std::__is_segmented_iterator<DequeIterator>::value, "");
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/spare_block_handling.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/spare_block_handling.pass.cpp
index 3b90464..e9e0034 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/spare_block_handling.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/deque/spare_block_handling.pass.cpp
@@ -15,13 +15,15 @@
 // resizes or shrinks at the correct time.
 
 #include <deque>
+#include <cassert>
 #include <cstdio>
 #include <memory>
 #include <queue>
 #include <stack>
+#include <string>
 
 #include "min_allocator.h"
-#include "rapid-cxx-test.h"
+#include "assert_macros.h"
 
 template <class Adaptor>
 struct ContainerAdaptor : public Adaptor {
@@ -56,22 +58,15 @@
 template <class Deque>
 struct PrintOnFailure {
    explicit PrintOnFailure(Deque const& deque) : deque_(&deque) {}
-
-  ~PrintOnFailure() {
-    if (::rapid_cxx_test::get_reporter().current_failure().type
-        != ::rapid_cxx_test::failure_type::none) {
-      print(*deque_);
-    }
-  }
+   void operator()() const { print(*deque_); }
 private:
   const Deque* deque_;
 
   PrintOnFailure(PrintOnFailure const&) = delete;
 };
 
-TEST_SUITE(deque_spare_tests)
 
-TEST_CASE(push_back) {
+static void push_back() {
   const auto BS = BlockSize<LargeT>::value;
   std::unique_ptr<Deque<LargeT>> dp(new Deque<LargeT>);
   auto& d = *dp;
@@ -79,126 +74,126 @@
 
   // Test nothing is allocated after default construction.
   {
-    TEST_REQUIRE(d.size() == 0);
-    TEST_REQUIRE(d.__capacity() == 0);
-    TEST_REQUIRE(d.__block_count() == 0);
+    TEST_REQUIRE(d.size() == 0, on_fail);
+    TEST_REQUIRE(d.__capacity() == 0, on_fail);
+    TEST_REQUIRE(d.__block_count() == 0, on_fail);
   }
   // First push back allocates one block.
   d.push_back({});
   {
-    TEST_REQUIRE(d.size() == 1);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 14);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
-    TEST_REQUIRE(d.__capacity() == BS - 1);
-    TEST_REQUIRE(d.__block_count() == 1);
+    TEST_REQUIRE(d.size() == 1, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 14, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__capacity() == BS - 1, on_fail);
+    TEST_REQUIRE(d.__block_count() == 1, on_fail);
   }
 
   d.push_back({});
   {
-    TEST_REQUIRE(d.size() == 2);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 13);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
+    TEST_REQUIRE(d.size() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 13, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
   }
   // Push back until we need a new block.
   for (int RemainingCap = d.__capacity() - d.size(); RemainingCap >= 0; --RemainingCap)
     d.push_back({});
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare() == 15);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 15, on_fail);
   }
 
   // Remove the only element in the new block. Test that we keep the empty
   // block as a spare.
   d.pop_back();
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare_blocks() == 1);
-    TEST_REQUIRE(d.__back_spare() == 16);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 1, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 16, on_fail);
   }
 
   // Pop back again, keep the spare.
   d.pop_back();
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 17);
-    TEST_REQUIRE(d.__back_spare_blocks() == 1);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 17, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 1, on_fail);
   }
 
   dp.reset();
-  TEST_REQUIRE(AllocBytes == 0);
+  TEST_REQUIRE(AllocBytes == 0, on_fail);
 }
 
-TEST_CASE(push_front) {
+static void push_front() {
   std::unique_ptr<Deque<LargeT>> dp(new Deque<LargeT>);
   auto& d = *dp;
   PrintOnFailure<Deque<LargeT>> on_fail(d);
 
   // Test nothing is allocated after default construction.
   {
-    TEST_REQUIRE(d.size() == 0);
-    TEST_REQUIRE(d.__capacity() == 0);
-    TEST_REQUIRE(d.__block_count() == 0);
+    TEST_REQUIRE(d.size() == 0, on_fail);
+    TEST_REQUIRE(d.__capacity() == 0, on_fail);
+    TEST_REQUIRE(d.__block_count() == 0, on_fail);
   }
   // First push front allocates one block, and we start the sequence in the
   // middle.
   d.push_front({});
   {
-    TEST_REQUIRE(d.size() == 1);
-    TEST_REQUIRE(d.__front_spare() == 7);
-    TEST_REQUIRE(d.__back_spare() == 7);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
-    TEST_REQUIRE(d.__block_count() == 1);
+    TEST_REQUIRE(d.size() == 1, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 7, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 7, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__block_count() == 1, on_fail);
   }
 
   d.push_front({});
   {
-    TEST_REQUIRE(d.size() == 2);
-    TEST_REQUIRE(d.__front_spare() == 6);
-    TEST_REQUIRE(d.__back_spare() == 7);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
+    TEST_REQUIRE(d.size() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 6, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 7, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
   }
   // Push front until we need a new block.
   for (int RemainingCap = d.__front_spare(); RemainingCap >= 0; --RemainingCap)
     d.push_front({});
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare() == 15);
-    TEST_REQUIRE(d.__back_spare() == 7);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 15, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 7, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
   }
 
   // Remove the only element in the new block. Test that we keep the empty
   // block as a spare.
   d.pop_front();
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare_blocks() == 1);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
-    TEST_REQUIRE(d.__back_spare() == 7);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 1, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 7, on_fail);
   }
 
   // Pop back again, keep the spare.
   d.pop_front();
   {
-    TEST_REQUIRE(d.__block_count() == 2);
-    TEST_REQUIRE(d.__front_spare_blocks() == 1);
-    TEST_REQUIRE(d.__back_spare() == 7);
+    TEST_REQUIRE(d.__block_count() == 2, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 1, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 7, on_fail);
   }
 
   dp.reset();
-  TEST_REQUIRE(AllocBytes == 0);
+  TEST_REQUIRE(AllocBytes == 0, on_fail);
 }
 
-TEST_CASE(std_queue) {
+static void std_queue() {
   using D = Deque<LargeT>;
   using Queue = std::queue<LargeT, D>;
   ContainerAdaptor<Queue> CA;
@@ -209,24 +204,24 @@
   while (d.__block_count() < 4)
     q.push({});
   {
-    TEST_REQUIRE(d.__block_count() == 4);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 15);
-    TEST_REQUIRE(d.__back_spare_blocks() == 0);
+    TEST_REQUIRE(d.__block_count() == 4, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 15, on_fail);
+    TEST_REQUIRE(d.__back_spare_blocks() == 0, on_fail);
   }
   while (d.__back_spare()) {
     q.push({});
   }
   {
-    TEST_REQUIRE(d.__block_count() == 4);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 0);
+    TEST_REQUIRE(d.__block_count() == 4, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 0, on_fail);
   }
   q.pop();
   {
-    TEST_REQUIRE(d.__block_count() == 4);
-    TEST_REQUIRE(d.__front_spare() == 1);
-    TEST_REQUIRE(d.__back_spare() == 0);
+    TEST_REQUIRE(d.__block_count() == 4, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 1, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 0, on_fail);
   }
 
   // Pop until we create a spare block at the front.
@@ -234,35 +229,35 @@
     q.pop();
 
   {
-    TEST_REQUIRE(d.__block_count() == 4);
-    TEST_REQUIRE(d.__front_spare_blocks() == 1);
-    TEST_REQUIRE(d.__front_spare() == 16);
-    TEST_REQUIRE(d.__back_spare() == 0);
+    TEST_REQUIRE(d.__block_count() == 4, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 1, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 16, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 0, on_fail);
   }
 
   // Push at the end -- should re-use new spare block at front
   q.push({});
 
   {
-    TEST_REQUIRE(d.__block_count() == 4);
-    TEST_REQUIRE(d.__front_spare_blocks() == 0);
-    TEST_REQUIRE(d.__front_spare() == 0);
-    TEST_REQUIRE(d.__back_spare() == 15);
+    TEST_REQUIRE(d.__block_count() == 4, on_fail);
+    TEST_REQUIRE(d.__front_spare_blocks() == 0, on_fail);
+    TEST_REQUIRE(d.__front_spare() == 0, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 15, on_fail);
   }
   while (!q.empty()) {
     q.pop();
-    TEST_REQUIRE(d.__front_spare_blocks() + d.__back_spare_blocks() <= 2);
+    TEST_REQUIRE(d.__front_spare_blocks() + d.__back_spare_blocks() <= 2, on_fail);
   }
 
   // The empty state has two blocks
   {
-    TEST_REQUIRE(d.__front_spare() == 16);
-    TEST_REQUIRE(d.__back_spare() == 15);
-    TEST_REQUIRE(d.__capacity() == 31);
+    TEST_REQUIRE(d.__front_spare() == 16, on_fail);
+    TEST_REQUIRE(d.__back_spare() == 15, on_fail);
+    TEST_REQUIRE(d.__capacity() == 31, on_fail);
   }
 }
 
-TEST_CASE(pop_front_push_back) {
+static void pop_front_push_back() {
   Deque<char> d(32 * 1024, 'a');
   bool take_from_front = true;
   while (d.size() > 0) {
@@ -279,4 +274,11 @@
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  push_back();
+  push_front();
+  std_queue();
+  pop_front_push_back();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
index 4d02547..22847b1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <list>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
index 1a823b2..4519725 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <list>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector.bool/trivial_for_purposes_of_call.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector.bool/trivial_for_purposes_of_call.pass.cpp
index d9d698f..d29b0f1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector.bool/trivial_for_purposes_of_call.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector.bool/trivial_for_purposes_of_call.pass.cpp
@@ -26,10 +26,9 @@
 
 // UNSUPPORTED: c++03
 
-#include <vector>
 #include <cassert>
-
-#include "test_macros.h"
+#include <type_traits>
+#include <vector>
 
 template <class T>
 using IsTrivialForCall = std::integral_constant<bool,
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
index b2956a6..42fd9bc 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
index 14c3800..7d8f6e3 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
index ee7e36e..5dc4867 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
index cba6479..b25c766 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
index 95a8160..0b3b380 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
index 3192768..12ad7a2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
index 8d4099f..5a7a90e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/exception_safety_exceptions_disabled.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/exception_safety_exceptions_disabled.pass.cpp
index dc77111..df56247 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/exception_safety_exceptions_disabled.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/sequences/vector/exception_safety_exceptions_disabled.pass.cpp
@@ -41,8 +41,8 @@
   // Create a vector containing some number of elements that will
   // have to be moved when it is resized.
   v.reserve(10);
-  size_t old_cap = v.capacity();
-  for (size_t i = 0; i < v.capacity(); ++i) {
+  std::size_t old_cap = v.capacity();
+  for (std::size_t i = 0; i < v.capacity(); ++i) {
     v.emplace_back(42);
   }
   assert(v.capacity() == old_cap);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_pow2.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_pow2.pass.cpp
index 5a29248..4aa87d3 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_pow2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_pow2.pass.cpp
@@ -31,7 +31,7 @@
     return __builtin_popcount(n) == 1;
 }
 
-void test_next_pow2_val(size_t n)
+void test_next_pow2_val(std::size_t n)
 {
         std::size_t npow2 = std::__next_hash_pow2(n);
         assert(is_power_of_two(npow2) && npow2 > n);
@@ -68,7 +68,7 @@
                            unsigned num_reserve1,
                            unsigned num_reserve2)
 {
-    std::unordered_map<uint64_t, unsigned long> m;
+    std::unordered_map<std::uint64_t, unsigned long> m;
     m.reserve(num_reserve1);
     for (unsigned I = 0; I < num_inserts; ++I) m[I] = 0;
     m.reserve(num_reserve2);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_prime.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_prime.pass.cpp
index 642e5fa..d19ab1e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_prime.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/next_prime.pass.cpp
@@ -22,7 +22,7 @@
 #include "test_macros.h"
 
 bool
-is_prime(size_t n)
+is_prime(std::size_t n)
 {
     switch (n)
     {
@@ -30,7 +30,7 @@
     case 1:
         return false;
     }
-    for (size_t i = 2; i*i <= n; ++i)
+    for (std::size_t i = 2; i*i <= n; ++i)
     {
         if (n % i == 0)
             return false;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.incomplete.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.incomplete.verify.cpp
index 603b4fc..9fd4f69 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.incomplete.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.incomplete.verify.cpp
@@ -48,12 +48,10 @@
   C c;
 }
 
-int main(int, char**) {
+void f() {
   // expected-no-diagnostics
   test_set<std::unordered_set>();
   test_set<std::unordered_multiset>();
   test_map<std::unordered_map>();
   test_map<std::unordered_multimap>();
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.verify.cpp
index 2a389c0..a5d529d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/non_const_comparator.verify.cpp
@@ -17,7 +17,7 @@
 
 struct BadHash {
   template <class T>
-  size_t operator()(T const& t) {
+  std::size_t operator()(T const& t) {
     return std::hash<T>{}(t);
   }
 };
@@ -29,7 +29,7 @@
   }
 };
 
-int main(int, char**) {
+void f() {
   static_assert(!std::__invokable<BadEqual const&, int const&, int const&>::value, "");
   static_assert(std::__invokable<BadEqual&, int const&, int const&>::value, "");
 
@@ -54,6 +54,4 @@
     using C = std::unordered_multimap<long, int, BadHash, BadEqual>;
     C s;
   }
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
index 4406fa8..e581b08 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
index 858ed1c..4a94b87 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
index b4505f9..22b7a6e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
index 0c2f12a..f1b3151 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
index 9c27d58..a1edf04 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
index 42bd462..0d72153 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
index 37d43fb..4d2d9eb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
index c8e7523..da9902e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
index 1b5aaa4..191a514 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
index 5634ffd..69d473a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
index dd3ad22..4a1788e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
index 385e627..e1afe26 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
index 45be37d..f492b76 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
@@ -28,7 +28,7 @@
   BadHashNoCopy(BadHashNoCopy const&) = delete;
 
   template <class T>
-  size_t operator()(T const&) const { return 0; }
+  std::size_t operator()(T const&) const { return 0; }
 };
 
 struct BadHashNoCall {
@@ -39,7 +39,7 @@
 struct GoodHashNoDefault {
   explicit GoodHashNoDefault(void*) {}
   template <class T>
-  size_t operator()(T const&) const { return 0; }
+  std::size_t operator()(T const&) const { return 0; }
 };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
index cd373e7..3ca2470 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
@@ -19,7 +19,7 @@
 // Check that we ensure that `[it, sent)` is a valid range.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
index 1888b4b..f48c186 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
@@ -16,7 +16,7 @@
 // dynamic_extent version.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
index 9e92e83..ab9c12f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
@@ -14,7 +14,7 @@
 // Check that we ensure `other.size() == Extent`.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
index bf1233f..2236de6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
@@ -14,7 +14,7 @@
 // Check that we ensure `size(r) == Extent`.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <span>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
index e6fb20d..95cc558 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
index 8234ef8..df750a7 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
index 2e643b3..12a8b23 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
index d17948f..733f9fd 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
index e49f37f..6ec90ad 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
index 487140f..a66ca54 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
@@ -9,16 +9,20 @@
 
 // <span>
 //
+// template<size_t Offset, size_t Count = dynamic_extent>
+// constexpr span<element_type, see-below> subspan() const;
+//
+// Requires: Offset <= size() && (Count == dynamic_extent || Count <= size() - Offset)
+//
 // constexpr span<element_type, dynamic_extent> subspan(
 //   size_type offset, size_type count = dynamic_extent) const;
 //
-//  Requires: (0 <= Offset && Offset <= size())
-//      && (Count == dynamic_extent || Count >= 0 && Offset + Count <= size())
+// Requires: offset <= size() && (count == dynamic_extent || count <= size() - offset)
 
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
@@ -44,13 +48,13 @@
         std::array<int, 3> array{0, 1, 2};
         std::span<int, 3> const s(array.data(), array.size());
         TEST_LIBCPP_ASSERT_FAILURE(s.subspan(4), "span<T, N>::subspan(offset, count): offset out of range");
-        // s.subspan<4>() caught at compile-time (tested elsewhere)
+        // s.subspan<4>() caught at compile-time (tested in libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp)
 
         TEST_LIBCPP_ASSERT_FAILURE(s.subspan(0, 4), "span<T, N>::subspan(offset, count): count out of range");
-        // s.subspan<0, 4>() caught at compile-time (tested elsewhere)
+        // s.subspan<0, 4>() caught at compile-time (tested in libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp)
 
         TEST_LIBCPP_ASSERT_FAILURE(s.subspan(1, 3), "span<T, N>::subspan(offset, count): offset + count out of range");
-        // s.subspan<1, 3>() caught at compile-time (tested elsewhere)
+        // s.subspan<1, 3>() caught at compile-time (tested in libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp)
     }
 
     return 0;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/debug/containers.multithread.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/debug/containers.multithread.pass.cpp
index a389c31..eb2373e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/debug/containers.multithread.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/debug/containers.multithread.pass.cpp
@@ -32,14 +32,14 @@
 
 template <typename Container>
 void ThreadUseIter() {
-  const size_t maxRounds = 7;
+  const std::size_t maxRounds = 7;
   struct TestRunner{
     void operator()() {
-      for (size_t count = 0; count < maxRounds; count++) {
-        const size_t containerCount = 11;
+      for (std::size_t count = 0; count < maxRounds; count++) {
+        const std::size_t containerCount = 11;
         std::vector<Container> containers;
         std::vector<typename Container::iterator> iterators;
-        for (size_t containerIndex = 0; containerIndex < containerCount; containerIndex++) {
+        for (std::size_t containerIndex = 0; containerIndex < containerCount; containerIndex++) {
           containers.push_back(makeContainer<Container>(3));
           Container& c = containers.back();
           iterators.push_back(c.begin());
@@ -50,12 +50,12 @@
   };
 
   TestRunner r;
-  const size_t threadCount = 4;
+  const std::size_t threadCount = 4;
   std::vector<std::thread> threads;
-  for (size_t count = 0; count < threadCount; count++)
+  for (std::size_t count = 0; count < threadCount; count++)
     threads.emplace_back(r);
   r();
-  for (size_t count = 0; count < threadCount; count++)
+  for (std::size_t count = 0; count < threadCount; count++)
     threads[count].join();
 }
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
index 9fc8306..3fe7ced 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
@@ -25,11 +25,6 @@
 #include <memory>
 #include "test_macros.h"
 
-int main(int, char**)
-{
-    typedef std::auto_ptr<int> AP; // expected-warning {{'auto_ptr<int>' is deprecated}}
-    typedef std::auto_ptr<void> APV; // expected-warning {{'auto_ptr<void>' is deprecated}}
-    typedef std::auto_ptr_ref<int> APR; // expected-warning {{'auto_ptr_ref<int>' is deprecated}}
-
-  return 0;
-}
+typedef std::auto_ptr<int> AP; // expected-warning {{'auto_ptr<int>' is deprecated}}
+typedef std::auto_ptr<void> APV; // expected-warning {{'auto_ptr<void>' is deprecated}}
+typedef std::auto_ptr_ref<int> APR; // expected-warning {{'auto_ptr_ref<int>' is deprecated}}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
index a4a05e6..b887df6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
@@ -6,6 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// When building with modules, including headers inside extern "C" is an anti-pattern
+// that we don't want to support and can't support with LSV enabled.
+// UNSUPPORTED: modules-build
+
 // Sometimes C++'s <foo.h> headers get included within extern "C" contexts. This
 // is ill-formed (no diagnostic required), per [using.headers]p3, but we permit
 // it as an extension.
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/stdint_h.xopen_source.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/stdint_h.xopen_source.compile.pass.cpp
index 688bab4..4f8ae78 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/stdint_h.xopen_source.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.c.headers/stdint_h.xopen_source.compile.pass.cpp
@@ -6,6 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+// This test breaks when enabling LSV.
+// UNSUPPORTED: modules-build
+
 // Test that limits macros are available when <stdint.h> is included
 // with or without macro _XOPEN_SOURCE=700.
 //
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/address.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/address.depr_in_cxx17.verify.cpp
index 4ccc3c0..5b21cc6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/address.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/address.depr_in_cxx17.verify.cpp
@@ -19,15 +19,10 @@
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS
 
 #include <memory>
-#include "test_macros.h"
 
-int main(int, char**)
-{
+void f() {
   int x = 0;
   std::allocator<int> a;
 
-  int* p = a.address(x); // expected-warning {{'address' is deprecated}}
-  (void)p;
-
-  return 0;
+  (void)a.address(x); // expected-warning {{'address' is deprecated}}
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.pass.cpp
index cca8510..da35465 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.pass.cpp
@@ -29,15 +29,15 @@
 #endif
 
 #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
-static const size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
+static const std::size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
 #else
-static const size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
+static const std::size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
 #endif
 
-static const size_t OverAligned = MaxAligned * 2;
+static const std::size_t OverAligned = MaxAligned * 2;
 
 
-template <size_t Align>
+template <std::size_t Align>
 struct TEST_ALIGNAS(Align) AlignedType {
   char data;
   static int constructed;
@@ -45,11 +45,11 @@
   AlignedType(AlignedType const&) { ++constructed; }
   ~AlignedType() { --constructed; }
 };
-template <size_t Align>
+template <std::size_t Align>
 int AlignedType<Align>::constructed = 0;
 
 
-template <size_t Align>
+template <std::size_t Align>
 void test_aligned() {
   typedef AlignedType<Align> T;
   T::constructed = 0;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.verify.cpp
index c122be5..2289cd6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.cxx2a.verify.cpp
@@ -21,14 +21,8 @@
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
 #include <memory>
-#include <cassert>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::allocator<int> a;
     a.allocate(3, nullptr); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.depr_in_cxx17.verify.cpp
index efb57b6..79fd61d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.default.allocator/allocator.members/allocate.depr_in_cxx17.verify.cpp
@@ -18,12 +18,10 @@
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS
 
 #include <memory>
+
 #include "test_macros.h"
 
-int main(int, char**)
-{
+void f() {
     std::allocator<int> a;
     TEST_IGNORE_NODISCARD a.allocate(3, nullptr); // expected-warning {{'allocate' is deprecated}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
index 2b3a05e..87d81d0 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
@@ -14,7 +14,6 @@
 
 #include <functional>
 #include <cassert>
-#include "test_macros.h"
 
 int identity(int v) { return v; }
 int sum(int a, int b) { return a + b; }
@@ -26,8 +25,7 @@
     int identity(int v) { return v; }
 };
 
-int main(int, char**)
-{
+void f() {
     typedef std::pointer_to_unary_function<int, int> PUF; // expected-warning {{'pointer_to_unary_function<int, int>' is deprecated}}
     typedef std::pointer_to_binary_function<int, int, int> PBF; // expected-warning {{'pointer_to_binary_function<int, int, int>' is deprecated}}
     std::ptr_fun<int, int>(identity); // expected-warning {{'ptr_fun<int, int>' is deprecated}}
@@ -50,6 +48,4 @@
     std::mem_fun_ref<int, Foo, int>(&Foo::identity); // expected-warning {{'mem_fun_ref<int, Foo, int>' is deprecated}}
     std::mem_fun_ref<int, Foo>(&Foo::const_zero); // expected-warning {{'mem_fun_ref<int, Foo>' is deprecated}}
     std::mem_fun_ref<int, Foo, int>(&Foo::const_identity); // expected-warning {{'mem_fun_ref<int, Foo, int>' is deprecated}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.compile.pass.cpp
similarity index 95%
rename from third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp
rename to third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.compile.pass.cpp
index 3ae848f..a734d8a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/depr/enable_removed_cpp17_features.compile.pass.cpp
@@ -22,8 +22,3 @@
 #ifndef _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
 #error _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR must be defined
 #endif
-
-int main(int, char**) {
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/math_nodiscard_extensions.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/math_nodiscard_extensions.verify.cpp
index a3db61b..dabeda7 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/math_nodiscard_extensions.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/math_nodiscard_extensions.verify.cpp
@@ -11,146 +11,155 @@
 // We don't control the implementation of the math.h functions on windows
 // UNSUPPORTED: windows
 
-// check that const cmath functions are declared [[nodiscard]]
+// Check that functions from `<cmath>` that Clang marks with the `[[gnu::const]]` attribute are declared
+// `[[nodiscard]]`.
 
 #include <cmath>
+#include "test_macros.h"
 
 void test() {
-  std::signbit(0.f);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::signbit(0.);              // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::signbit(0.l);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::signbit(0);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::signbit(0U);              // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::fpclassify(0.f);          // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fpclassify(0.);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fpclassify(0.l);          // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fpclassify(0);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fpclassify(0U);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isfinite(0.f);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isfinite(0.);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isfinite(0.l);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isfinite(0);              // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isfinite(0U);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isinf(0.f);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isinf(0.);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isinf(0.l);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isinf(0);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isinf(0U);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isnan(0.f);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnan(0.);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnan(0.l);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnan(0);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnan(0U);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isnormal(0.f);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnormal(0.);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnormal(0.l);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnormal(0);              // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isnormal(0U);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isgreater(0.f, 0.f);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreater(0., 0.);        // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreater(0.l, 0.l);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreater(0, 0);          // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreater(0U, 0U);        // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isgreaterequal(0.f, 0.f); // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreaterequal(0., 0.);   // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreaterequal(0.l, 0.l); // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreaterequal(0, 0);     // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isgreaterequal(0U, 0U);   // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isless(0.f, 0.f);         // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isless(0., 0.);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isless(0.l, 0.l);         // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isless(0, 0);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isless(0U, 0U);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::islessequal(0.f, 0.f);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessequal(0., 0.);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessequal(0.l, 0.l);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessequal(0, 0);        // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessequal(0U, 0U);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::islessgreater(0.f, 0.f);  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessgreater(0., 0.);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessgreater(0.l, 0.l);  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessgreater(0, 0);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::islessgreater(0U, 0U);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::isunordered(0.f, 0.f);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isunordered(0., 0.);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isunordered(0.l, 0.l);    // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isunordered(0, 0);        // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::isunordered(0U, 0U);      // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::ceil(0.f);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
+  // These tests rely on Clang's behaviour of adding `[[gnu::const]]` to the double overload of most of the functions
+  // below.
+  // Without that attribute being added implicitly, this test can't be checked consistently because its result depends
+  // on whether we're getting libc++'s own `std::foo(double)` or the underlying C library's `foo(double)`.
+#ifdef TEST_COMPILER_CLANG
   std::ceil(0.);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::ceil(0.l);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::ceil(0);                  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::ceil(0U);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::fabs(0.f);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::fabs(0.);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fabs(0.l);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fabs(0);                  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fabs(0U);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::floor(0.f);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::floor(0.);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::floor(0.l);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::floor(0);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::floor(0U);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::cbrt(0.f);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::cbrt(0.);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::cbrt(0.l);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::cbrt(0);                  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::cbrt(0U);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::copysign(0.f, 0.f);       // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::copysign(0., 0.);         // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::copysign(0.l, 0.l);       // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::copysign(0, 0);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::copysign(0U, 0U);         // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::fmax(0.f, 0.f);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::fmax(0., 0.);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmax(0.l, 0.l);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmax(0, 0);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmax(0U, 0U);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::fmin(0.f, 0.f);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::fmin(0., 0.);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmin(0.l, 0.l);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmin(0, 0);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::fmin(0U, 0U);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::nearbyint(0.f);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::nearbyint(0.);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::nearbyint(0.l);           // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::nearbyint(0);             // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::nearbyint(0U);            // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::rint(0.f);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::rint(0.);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::rint(0.l);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::rint(0);                  // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::rint(0U);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::round(0.f);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::round(0.);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::round(0.l);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::round(0);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::round(0U);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-
-  std::trunc(0.f);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
   std::trunc(0.);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::trunc(0.l);               // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::trunc(0);                 // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
-  std::trunc(0U);                // expected-warning-re {{ignoring return value of function declared with {{.*}} attribute}}
+#endif
+
+  std::signbit(0.f);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::signbit(0.);              // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::signbit(0.l);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::signbit(0);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::signbit(0U);              // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::fpclassify(0.f);          // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fpclassify(0.);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fpclassify(0.l);          // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fpclassify(0);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fpclassify(0U);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isfinite(0.f);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isfinite(0.);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isfinite(0.l);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isfinite(0);              // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isfinite(0U);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isinf(0.f);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isinf(0.);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isinf(0.l);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isinf(0);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isinf(0U);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isnan(0.f);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnan(0.);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnan(0.l);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnan(0);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnan(0U);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isnormal(0.f);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnormal(0.);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnormal(0.l);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnormal(0);              // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isnormal(0U);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isgreater(0.f, 0.f);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreater(0., 0.);        // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreater(0.l, 0.l);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreater(0, 0);          // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreater(0U, 0U);        // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isgreaterequal(0.f, 0.f); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreaterequal(0., 0.);   // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreaterequal(0.l, 0.l); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreaterequal(0, 0);     // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isgreaterequal(0U, 0U);   // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isless(0.f, 0.f);         // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isless(0., 0.);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isless(0.l, 0.l);         // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isless(0, 0);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isless(0U, 0U);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::islessequal(0.f, 0.f);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessequal(0., 0.);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessequal(0.l, 0.l);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessequal(0, 0);        // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessequal(0U, 0U);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::islessgreater(0.f, 0.f);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessgreater(0., 0.);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessgreater(0.l, 0.l);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessgreater(0, 0);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::islessgreater(0U, 0U);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::isunordered(0.f, 0.f);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isunordered(0., 0.);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isunordered(0.l, 0.l);    // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isunordered(0, 0);        // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::isunordered(0U, 0U);      // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::ceil(0.f);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::ceil(0.l);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::ceil(0);                  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::ceil(0U);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::fabs(0.f);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fabs(0.l);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fabs(0);                  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fabs(0U);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::floor(0.f);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::floor(0.l);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::floor(0);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::floor(0U);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::cbrt(0.f);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::cbrt(0.l);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::cbrt(0);                  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::cbrt(0U);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::copysign(0.f, 0.f);       // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::copysign(0.l, 0.l);       // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::copysign(0, 0);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::copysign(0U, 0U);         // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::fmax(0.f, 0.f);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmax(0.l, 0.l);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmax(0, 0);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmax(0U, 0U);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::fmin(0.f, 0.f);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmin(0.l, 0.l);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmin(0, 0);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::fmin(0U, 0U);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::nearbyint(0.f);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::nearbyint(0.l);           // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::nearbyint(0);             // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::nearbyint(0U);            // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::rint(0.f);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::rint(0.l);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::rint(0);                  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::rint(0U);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::round(0.f);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::round(0.l);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::round(0);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::round(0U);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  std::trunc(0.f);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::trunc(0.l);               // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::trunc(0);                 // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::trunc(0U);                // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_aftercxx17.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_aftercxx17.verify.cpp
index 9e3796c..242d935 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_aftercxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_aftercxx17.verify.cpp
@@ -16,9 +16,6 @@
 
 _LIBCPP_NODISCARD_AFTER_CXX17 int foo() { return 6; }
 
-int main(int, char**)
-{
+void f() {
     foo(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.compile.pass.cpp
index e0d457b..0cc86e2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.compile.pass.cpp
@@ -183,12 +183,10 @@
 #endif
 }
 
-int main(int, char**) {
+void tests() {
   test_algorithms();
 
   int i = 42;
   test_template_cast_wrappers(i, std::move(i));
   test_nontemplate_cast_wrappers();
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
index e816624..3d0dd2a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
@@ -174,6 +174,14 @@
   std::lexicographical_compare(std::begin(arr), std::end(arr), std::begin(arr),
                                std::end(arr), std::greater<int>());
 
+#if TEST_STD_VER >= 20
+  // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::lexicographical_compare_three_way(std::begin(arr), std::end(arr), std::begin(arr), std::end(arr));
+
+  // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}}
+  std::lexicographical_compare_three_way(std::begin(arr), std::end(arr), std::begin(arr), std::end(arr), std::compare_three_way());
+#endif
+
   // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}}
   std::lower_bound(std::begin(arr), std::end(arr), 1);
 
@@ -341,12 +349,10 @@
 #endif
 }
 
-int main(int, char**) {
+void f() {
   test_algorithms();
 
   int i = 42;
   test_template_cast_wrappers(i, std::move(i));
   test_nontemplate_cast_wrappers();
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/double_include.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/double_include.sh.cpp
index ea9fc7b..b6bbf4e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/double_include.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/double_include.sh.cpp
@@ -13,9 +13,6 @@
 // RUN: %{cxx} -o %t.exe %t.first.o %t.second.o %{flags} %{link_flags}
 // RUN: %{run}
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // Prevent <ext/hash_map> from generating deprecated warnings for this test.
 #if defined(__DEPRECATED)
 #    undef __DEPRECATED
@@ -216,21 +213,12 @@
 #   include <wctype.h>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/algorithm>
-#endif
-#if __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/deque>
 #endif
 #if __cplusplus >= 201103L
 #   include <experimental/forward_list>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/functional>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/iterator>
 #endif
 #if __cplusplus >= 201103L
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp
deleted file mode 100644
index ba207e9..0000000
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <experimental/algorithm>
-
-#include <experimental/algorithm>
-
-#include "test_macros.h"
-
-#ifndef _LIBCPP_ALGORITHM
-#  error "<experimental/algorithm> must include <algorithm>"
-#endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/version.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/version.pass.cpp
deleted file mode 100644
index 0a96474..0000000
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/algorithms/version.pass.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <experimental/algorithm>
-
-#include <experimental/algorithm>
-
-#include "test_macros.h"
-
-#ifndef _LIBCPP_VERSION
-#  error _LIBCPP_VERSION not defined
-#endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/dialect_support.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/dialect_support.pass.cpp
deleted file mode 100644
index c237ca0..0000000
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/dialect_support.pass.cpp
+++ /dev/null
@@ -1,59 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// REQUIRES: fcoroutines-ts
-// ADDITIONAL_COMPILE_FLAGS: -fcoroutines-ts -Wno-coroutine
-
-// A simple "breathing" test that checks that <experimental/coroutine>
-// can be parsed and used in all dialects, including C++03 in order to match
-// Clang's behavior.
-
-#include <experimental/coroutine>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental::coroutines_v1;
-
-coro::suspend_always sa;
-coro::suspend_never sn;
-
-struct MyFuture {
-  struct promise_type {
-    typedef coro::coroutine_handle<promise_type> HandleT;
-    coro::suspend_never initial_suspend() { return sn; }
-    coro::suspend_always final_suspend() TEST_NOEXCEPT { return sa; }
-    coro::suspend_never yield_value(int) { return sn; }
-    MyFuture get_return_object() {
-      MyFuture f(HandleT::from_promise(*this));
-      return f;
-    }
-    void return_void() {}
-    void unhandled_exception() {}
-  };
-  typedef promise_type::HandleT HandleT;
-  MyFuture() : p() {}
-  MyFuture(HandleT h) : p(h) {}
-
-  coro::coroutine_handle<promise_type> p;
-};
-
-MyFuture test_coro() {
-  co_await sn;
-  co_yield 42;
-  co_return;
-}
-
-int main(int, char**)
-{
-  MyFuture f = test_coro();
-  while (!f.p.done())
-    f.p.resume();
-  f.p.destroy();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/version.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/version.pass.cpp
deleted file mode 100644
index 46cf345..0000000
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/language.support/support.coroutines/version.pass.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// REQUIRES: fcoroutines-ts
-// ADDITIONAL_COMPILE_FLAGS: -fcoroutines-ts
-
-#include <experimental/coroutine>
-
-#ifndef _LIBCPP_VERSION
-#error _LIBCPP_VERSION must be defined
-#endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
index 5c717f8..c68e6a3 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
@@ -14,7 +14,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
index 5305042..a2dc95a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
@@ -14,7 +14,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
index b6945bb..fc12e65 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
index c59ac64..5e2e02f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/fuzzing/nth_element.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/fuzzing/nth_element.pass.cpp
index 5e491e7..45f4aed 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/fuzzing/nth_element.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/fuzzing/nth_element.pass.cpp
@@ -18,7 +18,7 @@
 // Use the first element as a position into the data
 extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t *data, std::size_t size) {
     if (size <= 1) return 0;
-    const size_t partition_point = data[0] % size;
+    const std::size_t partition_point = data[0] % size;
     std::vector<std::uint8_t> working(data + 1, data + size);
     const auto partition_iter = working.begin() + partition_point;
     std::nth_element(working.begin(), partition_iter, working.end());
diff --git a/third_party/llvm-project/libcxx/test/libcxx/fuzzing/random.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/fuzzing/random.pass.cpp
index e7545ff..79ab7ac 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/fuzzing/random.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/fuzzing/random.pass.cpp
@@ -38,7 +38,7 @@
   using ResultT = typename Dist::result_type;
   static_assert(std::is_same<ResultT, typename ParamT::distribution_type::result_type>::value, "");
 
-  static ParamT Create(const uint8_t* data, std::size_t size, bool &OK) {
+  static ParamT Create(const std::uint8_t* data, std::size_t size, bool &OK) {
     constexpr bool select_vector_result = std::is_constructible<ParamT, ResultT*, ResultT*, ResultT*>::value;
     constexpr bool select_vector_double = std::is_constructible<ParamT, double*, double*>::value;
     constexpr int selector = select_vector_result ? 0 : (select_vector_double ? 1 : 2);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp
index 48b3f10..c8529f9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp
@@ -12,7 +12,7 @@
 // UNSUPPORTED: c++03
 
 // TODO: Investigate these failures which break the CI.
-// UNSUPPORTED: clang-14, clang-15, clang-16
+// UNSUPPORTED: clang-14, clang-15, clang-16, clang-17
 
 // TODO: Investigate this failure on GCC 12 (in Ubuntu Jammy)
 // UNSUPPORTED: gcc-12
diff --git a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
index 9a19c46..4c6ac40 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
@@ -26,17 +26,15 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 #include "filesystem_common.h"
 
 using namespace fs::detail;
 
-TEST_SUITE(directory_entry_mods_suite)
-
-TEST_CASE(last_write_time_not_representable_error) {
+static void last_write_time_not_representable_error() {
   using namespace fs;
   using namespace std::chrono;
   scoped_test_env env;
@@ -55,13 +53,13 @@
   file_time_type start_time = file_time_type::clock::now() - hours(1);
   last_write_time(file, start_time);
 
-  TEST_CHECK(ent.last_write_time() == old_time);
+  assert(ent.last_write_time() == old_time);
 
   bool IsRepresentable = true;
   file_time_type rep_value;
   {
     std::error_code ec;
-    TEST_REQUIRE(!set_file_times(file, TS, ec));
+    assert(!set_file_times(file, TS, ec));
     ec.clear();
     rep_value = last_write_time(file, ec);
     IsRepresentable = !bool(ec);
@@ -70,30 +68,34 @@
   if (!IsRepresentable) {
     std::error_code rec = GetTestEC();
     ent.refresh(rec);
-    TEST_CHECK(!rec);
+    assert(!rec);
 
     const std::errc expected_err = std::errc::value_too_large;
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, expected_err));
+    assert(ent.last_write_time(ec) == file_time_type::min());
+    assert(ErrorIs(ec, expected_err));
 
     ec = GetTestEC();
-    TEST_CHECK(last_write_time(file, ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, expected_err));
+    assert(last_write_time(file, ec) == file_time_type::min());
+    assert(ErrorIs(ec, expected_err));
 
     ExceptionChecker CheckExcept(file, expected_err,
                                  "directory_entry::last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, CheckExcept,
+    TEST_VALIDATE_EXCEPTION(filesystem_error, CheckExcept,
                             ent.last_write_time());
 
   } else {
     ent.refresh();
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == rep_value);
-    TEST_CHECK(!ec);
+    assert(ent.last_write_time(ec) == rep_value);
+    assert(!ec);
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  last_write_time_not_representable_error();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
index 9dc863d..c397f23 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <filesystem>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/convert_file_time.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/convert_file_time.pass.cpp
index 88054f3..b86282c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/convert_file_time.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/input.output/filesystems/convert_file_time.pass.cpp
@@ -280,12 +280,12 @@
 int main(int, char**) {
   { assert((test_case<file_time_type, time_t, struct timespec>::test())); }
   {
-    assert((test_case<TestFileTimeT<int64_t>, int64_t,
-                      TestTimeSpec<int64_t, long> >::test()));
+    assert((test_case<TestFileTimeT<std::int64_t>, std::int64_t,
+                      TestTimeSpec<std::int64_t, long> >::test()));
   }
   {
-    assert((test_case<TestFileTimeT<long long>, int32_t,
-                      TestTimeSpec<int32_t, int32_t> >::test()));
+    assert((test_case<TestFileTimeT<long long>, std::int32_t,
+                      TestTimeSpec<std::int32_t, std::int32_t> >::test()));
   }
   {
     // Test that insane platforms like ppc64 linux, which use long double as time_t,
@@ -295,12 +295,12 @@
   }
 #ifndef TEST_HAS_NO_INT128_T
   {
-    assert((test_case<TestFileTimeT<__int128_t, std::nano>, int64_t,
-                      TestTimeSpec<int64_t, long> >::test()));
+    assert((test_case<TestFileTimeT<__int128_t, std::nano>, std::int64_t,
+                      TestTimeSpec<std::int64_t, long> >::test()));
   }
   {
-    assert((test_case<TestFileTimeT<__int128_t, std::nano>, int32_t,
-                      TestTimeSpec<int32_t, int32_t> >::test()));
+    assert((test_case<TestFileTimeT<__int128_t, std::nano>, std::int32_t,
+                      TestTimeSpec<std::int32_t, std::int32_t> >::test()));
   }
 #endif
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.advance.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
index 715aebe..b455767 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.next.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.next.pass.cpp
index 6a5328e..992a406 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.next.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.next.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.prev.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
index 5e5723c..f1903cb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
index d426148..04761fa 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
@@ -13,7 +13,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <iterator>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
index 7ba8c75..dff0185 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_bidirectional_iterator;
@@ -72,7 +72,7 @@
 static_assert(!std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::back_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::front_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::insert_iterator<std::vector<int>>>);
-static_assert(!std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::move_iterator<int*>>);
+static_assert(std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::move_iterator<int*>>);
 
 // <list>
 static_assert(std::__iterator_traits_detail::__cpp17_bidirectional_iterator<std::list<int>::iterator>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
index 7a2000a..2371cbd 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_forward_iterator;
@@ -72,7 +72,7 @@
 static_assert(!std::__iterator_traits_detail::__cpp17_forward_iterator<std::back_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_forward_iterator<std::front_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_forward_iterator<std::insert_iterator<std::vector<int>>>);
-static_assert(!std::__iterator_traits_detail::__cpp17_forward_iterator<std::move_iterator<int*>>);
+static_assert(std::__iterator_traits_detail::__cpp17_forward_iterator<std::move_iterator<int*>>);
 
 // <list>
 static_assert(std::__iterator_traits_detail::__cpp17_forward_iterator<std::list<int>::iterator>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
index 49f42dd..e6c48b5 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_input_iterator;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
index 3ce86df..2dc3320 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_iterator;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
index ddbf60f..01fef35 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_random_access_iterator;
@@ -72,7 +72,7 @@
 static_assert(!std::__iterator_traits_detail::__cpp17_random_access_iterator<std::back_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_random_access_iterator<std::front_insert_iterator<std::vector<int>>>);
 static_assert(!std::__iterator_traits_detail::__cpp17_random_access_iterator<std::insert_iterator<std::vector<int>>>);
-static_assert(!std::__iterator_traits_detail::__cpp17_random_access_iterator<std::move_iterator<int*>>);
+static_assert(std::__iterator_traits_detail::__cpp17_random_access_iterator<std::move_iterator<int*>>);
 
 // <list>
 static_assert(!std::__iterator_traits_detail::__cpp17_random_access_iterator<std::list<int>::iterator>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator_with_data.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator_with_data.pass.cpp
index a4c2b08..b2e3ffe 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator_with_data.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/iterator_with_data.pass.cpp
@@ -36,4 +36,6 @@
 int main(int, char**) {
   test();
   static_assert(test());
+
+  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/__unconstrained_reverse_iterator/reverse.iter.cons/ctor.iter.explicit.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/__unconstrained_reverse_iterator/reverse.iter.cons/ctor.iter.explicit.verify.cpp
index 95626be..6440e28 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/__unconstrained_reverse_iterator/reverse.iter.cons/ctor.iter.explicit.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/__unconstrained_reverse_iterator/reverse.iter.cons/ctor.iter.explicit.verify.cpp
@@ -16,8 +16,7 @@
 
 #include <iterator>
 
-int main(int, char**) {
+void f() {
     char const* it = "";
     std::__unconstrained_reverse_iterator<char const*> r = it; // expected-error{{no viable conversion from 'const char *' to 'std::__unconstrained_reverse_iterator<const char *>'}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/reverse.iterators/bad_template_argument.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/reverse.iterators/bad_template_argument.verify.cpp
index 4ccf85e..1ad9ca9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/reverse.iterators/bad_template_argument.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/iterators/predef.iterators/reverse.iterators/bad_template_argument.verify.cpp
@@ -16,9 +16,7 @@
 
 #include "test_iterators.h"
 
-int main(int, char**) {
+void f() {
   using BadIter = std::reverse_iterator<forward_iterator<int*>>;
   BadIter i; //expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}reverse_iterator<It> requires It to be a bidirectional iterator.}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
index 2f63ee3..723cd9f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
@@ -11,7 +11,7 @@
 // Test exporting the symbol: "__cxa_deleted_virtual" in macosx
 // But don't expect the symbol to be exported in previous versions.
 //
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 struct S { virtual void f() = delete; virtual ~S() {} };
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.c.headers/support.c.headers.other/math.lerp.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.c.headers/support.c.headers.other/math.lerp.verify.cpp
new file mode 100644
index 0000000..658d60c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.c.headers/support.c.headers.other/math.lerp.verify.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// When built with modules, this test gives diagnostics like
+//  declaration of 'lerp' must be imported from module 'std.compat.cmath'
+//  before it is required
+// therefore disable the test in this configuration.
+// UNSUPPORTED: modules-build
+
+// <math.h>
+
+// [support.c.headers.other]/1
+//   ... except for the functions described in [sf.cmath], the
+//   std::lerp function overloads ([c.math.lerp]) ...
+
+#include <math.h>
+
+void f() {
+  {
+    float f;
+    ::lerp(f, f, f);    // expected-error {{no member named 'lerp' in the global namespace}}
+    std::lerp(f, f, f); // expected-error {{no member named 'lerp' in namespace 'std'}}
+  }
+  {
+    double d;
+    ::lerp(d, d, d);    // expected-error {{no member named 'lerp' in the global namespace}}
+    std::lerp(d, d, d); // expected-error {{no member named 'lerp' in namespace 'std'}}
+  }
+  {
+    long double l;
+    ::lerp(l, l, l);    // expected-error {{no member named 'lerp' in the global namespace}}
+    std::lerp(l, l, l); // expected-error {{no member named 'lerp' in namespace 'std'}}
+  }
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
index 6296bbd..159ab9b 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
@@ -10,9 +10,7 @@
 // allocation/deallocation on deployment targets that don't support it (before macosx10.13).
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Aligned allocation was not provided before macosx10.13.
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// REQUIRES: availability-aligned_allocation-missing
 
 #include <new>
 #include <cstddef>
@@ -23,8 +21,7 @@
 
 struct alignas(OverAligned) A { };
 
-int main(int, char**)
-{
+void f() {
     // Normal versions
     {
         A *a1 = new A; // expected-error-re {{aligned allocation function of type {{.+}} is only available on}}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
index 545032b..9acaa4a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
@@ -9,10 +9,9 @@
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// The dylibs shipped before macosx10.13 do not contain the aligned allocation
-// functions, so trying to force using those with -faligned-allocation results
-// in a link error.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// Some dylibs do not contain the aligned allocation functions, so trying to force
+// using those with -faligned-allocation results in a link error.
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
@@ -42,6 +41,11 @@
 
 #include "test_macros.h"
 
+TEST_DIAGNOSTIC_PUSH
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wprivate-header")
+#include <__memory/aligned_alloc.h>
+TEST_DIAGNOSTIC_POP
+
 struct alloc_stats {
   alloc_stats() { reset(); }
 
@@ -102,7 +106,7 @@
 }
 
 #ifndef NO_SIZE
-void operator delete(void* p, size_t n)TEST_NOEXCEPT {
+void operator delete(void* p, std::size_t n)TEST_NOEXCEPT {
   ::free(p);
   stats.sized_called++;
   stats.last_size = n;
@@ -118,7 +122,7 @@
   stats.last_size = -1;
 }
 
-void operator delete(void* p, size_t n, std::align_val_t a)TEST_NOEXCEPT {
+void operator delete(void* p, std::size_t n, std::align_val_t a)TEST_NOEXCEPT {
   std::__libcpp_aligned_free(p);
   stats.aligned_sized_called++;
   stats.last_align = static_cast<int>(a);
@@ -129,12 +133,12 @@
 void test_libcpp_dealloc() {
   void* p = nullptr;
 #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
-  size_t over_align_val = __STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2;
+  std::size_t over_align_val = __STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2;
 #else
-  size_t over_align_val = TEST_ALIGNOF(std::max_align_t) * 2;
+  std::size_t over_align_val = TEST_ALIGNOF(std::max_align_t) * 2;
 #endif
-  size_t under_align_val = TEST_ALIGNOF(int);
-  size_t with_size_val = 2;
+  std::size_t under_align_val = TEST_ALIGNOF(int);
+  std::size_t with_size_val = 2;
 
   {
     std::__libcpp_deallocate_unsized(p, under_align_val);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
index 8820e12..8d766ac 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
@@ -9,10 +9,9 @@
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// The dylibs shipped before macosx10.13 do not contain the aligned allocation
-// functions, so trying to force using those with -faligned-allocation results
-// in a link error.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// Some dylibs do not contain the aligned allocation functions, so trying to force
+// using those with -faligned-allocation results in a link error.
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
@@ -21,14 +20,15 @@
 // REQUIRES: -faligned-allocation
 // ADDITIONAL_COMPILE_FLAGS: -faligned-allocation
 
-#include <new>
-#include <typeinfo>
-#include <string>
 #include <cassert>
+#include <new>
+#include <string>
+#include <type_traits>
+#include <typeinfo>
 
 #include "test_macros.h"
 
-static void test_allocations(size_t size, size_t alignment) {
+static void test_allocations(std::size_t size, size_t alignment) {
   {
     void* ptr = ::operator new(size, std::align_val_t(alignment));
     assert(ptr);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/language.support/timespec_get.xopen.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/language.support/timespec_get.xopen.compile.pass.cpp
index cf4c595..430ddac 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/language.support/timespec_get.xopen.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/language.support/timespec_get.xopen.compile.pass.cpp
@@ -6,6 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+// This test breaks when enabling LSV.
+// UNSUPPORTED: modules-build
+
 // UNSUPPORTED: c++03, c++11, c++14
 
 // Make sure that <ctime> can be included even when _XOPEN_SOURCE is defined.
diff --git a/third_party/llvm-project/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
index 5c28ff9..d263397 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 #include <new>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/min_max_macros.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/min_max_macros.compile.pass.cpp
index 0d9170b..9dd4345 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/min_max_macros.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/min_max_macros.compile.pass.cpp
@@ -9,9 +9,6 @@
 // Test that headers are not tripped up by the surrounding code defining the
 // min() and max() macros.
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // Prevent <ext/hash_map> from generating deprecated warnings for this test.
 #if defined(__DEPRECATED)
 #    undef __DEPRECATED
@@ -338,14 +335,6 @@
 TEST_MACROS();
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/algorithm>
-TEST_MACROS();
-#endif
-#if __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
-TEST_MACROS();
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/deque>
 TEST_MACROS();
 #endif
@@ -354,10 +343,6 @@
 TEST_MACROS();
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/functional>
-TEST_MACROS();
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/iterator>
 TEST_MACROS();
 #endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/modules_include.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/modules_include.sh.cpp
index a45d3d4..1ef40a1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/modules_include.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/modules_include.sh.cpp
@@ -10,16 +10,12 @@
 // This is important notably because the LLDB data formatters use
 // libc++ headers with modules enabled.
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
-// XFAIL: LIBCXX-FREEBSD-FIXME
-
 // GCC doesn't support -fcxx-modules
 // UNSUPPORTED: gcc
 
 // The Windows headers don't appear to be compatible with modules
 // UNSUPPORTED: windows
+// UNSUPPORTED: buildhost=windows
 
 // The Android headers don't appear to be compatible with modules yet
 // XFAIL: LIBCXX-ANDROID-FIXME
@@ -35,7 +31,10 @@
 BEGIN-SCRIPT
 
 for i, header in enumerate(public_headers):
-  print("// {}: %{{cxx}} %s %{{flags}} %{{compile_flags}} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_{}".format('RUN', i))
+  print("// {}: echo '%{{cxx}} %s %{{flags}} %{{compile_flags}} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_{} &' >> %t.sh".format('RUN', i))
+  print("// {}: echo 'TEST_{}=$!' >> %t.sh".format('RUN', i))
+  if i >= 16:
+    print("// {}: echo \"wait $TEST_{}\" >> %t.sh".format('RUN', i - 16))
   if header in header_restrictions:
     print("#if defined(TEST_{}) && {}".format(i, header_restrictions[header]))
   else:
@@ -43,584 +42,859 @@
   print("#include <{}>".format(header))
   print("#endif")
 
+for i in range(len(public_headers))[-16:]:
+  print("// {}: echo \"wait $TEST_{}\" >> %t.sh".format('RUN', i))
+
+print("// {}: bash %t.sh".format('RUN'))
+
 END-SCRIPT
 */
 
+// RUN: echo "" > %t.sh
 // RUN: rm -rf %t
 // RUN: mkdir %t
 
 // DO NOT MANUALLY EDIT ANYTHING BETWEEN THE MARKERS BELOW
 // GENERATED-MARKER
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_0
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_0 &' >> %t.sh
+// RUN: echo 'TEST_0=$!' >> %t.sh
 #if defined(TEST_0)
 #include <algorithm>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_1
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_1 &' >> %t.sh
+// RUN: echo 'TEST_1=$!' >> %t.sh
 #if defined(TEST_1)
 #include <any>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_2
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_2 &' >> %t.sh
+// RUN: echo 'TEST_2=$!' >> %t.sh
 #if defined(TEST_2)
 #include <array>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_3
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_3 &' >> %t.sh
+// RUN: echo 'TEST_3=$!' >> %t.sh
 #if defined(TEST_3)
 #include <atomic>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_4
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_4 &' >> %t.sh
+// RUN: echo 'TEST_4=$!' >> %t.sh
 #if defined(TEST_4) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <barrier>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_5
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_5 &' >> %t.sh
+// RUN: echo 'TEST_5=$!' >> %t.sh
 #if defined(TEST_5)
 #include <bit>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_6
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_6 &' >> %t.sh
+// RUN: echo 'TEST_6=$!' >> %t.sh
 #if defined(TEST_6)
 #include <bitset>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_7
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_7 &' >> %t.sh
+// RUN: echo 'TEST_7=$!' >> %t.sh
 #if defined(TEST_7)
 #include <cassert>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_8
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_8 &' >> %t.sh
+// RUN: echo 'TEST_8=$!' >> %t.sh
 #if defined(TEST_8)
 #include <ccomplex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_9
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_9 &' >> %t.sh
+// RUN: echo 'TEST_9=$!' >> %t.sh
 #if defined(TEST_9)
 #include <cctype>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_10
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_10 &' >> %t.sh
+// RUN: echo 'TEST_10=$!' >> %t.sh
 #if defined(TEST_10)
 #include <cerrno>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_11
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_11 &' >> %t.sh
+// RUN: echo 'TEST_11=$!' >> %t.sh
 #if defined(TEST_11)
 #include <cfenv>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_12
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_12 &' >> %t.sh
+// RUN: echo 'TEST_12=$!' >> %t.sh
 #if defined(TEST_12)
 #include <cfloat>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_13
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_13 &' >> %t.sh
+// RUN: echo 'TEST_13=$!' >> %t.sh
 #if defined(TEST_13)
 #include <charconv>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_14
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_14 &' >> %t.sh
+// RUN: echo 'TEST_14=$!' >> %t.sh
 #if defined(TEST_14)
 #include <chrono>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_15
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_15 &' >> %t.sh
+// RUN: echo 'TEST_15=$!' >> %t.sh
 #if defined(TEST_15)
 #include <cinttypes>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_16
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_16 &' >> %t.sh
+// RUN: echo 'TEST_16=$!' >> %t.sh
+// RUN: echo "wait $TEST_0" >> %t.sh
 #if defined(TEST_16)
 #include <ciso646>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_17
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_17 &' >> %t.sh
+// RUN: echo 'TEST_17=$!' >> %t.sh
+// RUN: echo "wait $TEST_1" >> %t.sh
 #if defined(TEST_17)
 #include <climits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_18
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_18 &' >> %t.sh
+// RUN: echo 'TEST_18=$!' >> %t.sh
+// RUN: echo "wait $TEST_2" >> %t.sh
 #if defined(TEST_18) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <clocale>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_19
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_19 &' >> %t.sh
+// RUN: echo 'TEST_19=$!' >> %t.sh
+// RUN: echo "wait $TEST_3" >> %t.sh
 #if defined(TEST_19)
 #include <cmath>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_20
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_20 &' >> %t.sh
+// RUN: echo 'TEST_20=$!' >> %t.sh
+// RUN: echo "wait $TEST_4" >> %t.sh
 #if defined(TEST_20) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <codecvt>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_21
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_21 &' >> %t.sh
+// RUN: echo 'TEST_21=$!' >> %t.sh
+// RUN: echo "wait $TEST_5" >> %t.sh
 #if defined(TEST_21)
 #include <compare>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_22
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_22 &' >> %t.sh
+// RUN: echo 'TEST_22=$!' >> %t.sh
+// RUN: echo "wait $TEST_6" >> %t.sh
 #if defined(TEST_22)
 #include <complex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_23
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_23 &' >> %t.sh
+// RUN: echo 'TEST_23=$!' >> %t.sh
+// RUN: echo "wait $TEST_7" >> %t.sh
 #if defined(TEST_23)
 #include <complex.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_24
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_24 &' >> %t.sh
+// RUN: echo 'TEST_24=$!' >> %t.sh
+// RUN: echo "wait $TEST_8" >> %t.sh
 #if defined(TEST_24)
 #include <concepts>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_25
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_25 &' >> %t.sh
+// RUN: echo 'TEST_25=$!' >> %t.sh
+// RUN: echo "wait $TEST_9" >> %t.sh
 #if defined(TEST_25)
 #include <condition_variable>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_26
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_26 &' >> %t.sh
+// RUN: echo 'TEST_26=$!' >> %t.sh
+// RUN: echo "wait $TEST_10" >> %t.sh
 #if defined(TEST_26) && (defined(__cpp_impl_coroutine) && __cpp_impl_coroutine >= 201902L) || (defined(__cpp_coroutines) && __cpp_coroutines >= 201703L)
 #include <coroutine>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_27
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_27 &' >> %t.sh
+// RUN: echo 'TEST_27=$!' >> %t.sh
+// RUN: echo "wait $TEST_11" >> %t.sh
 #if defined(TEST_27)
 #include <csetjmp>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_28
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_28 &' >> %t.sh
+// RUN: echo 'TEST_28=$!' >> %t.sh
+// RUN: echo "wait $TEST_12" >> %t.sh
 #if defined(TEST_28)
 #include <csignal>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_29
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_29 &' >> %t.sh
+// RUN: echo 'TEST_29=$!' >> %t.sh
+// RUN: echo "wait $TEST_13" >> %t.sh
 #if defined(TEST_29)
 #include <cstdarg>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_30
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_30 &' >> %t.sh
+// RUN: echo 'TEST_30=$!' >> %t.sh
+// RUN: echo "wait $TEST_14" >> %t.sh
 #if defined(TEST_30)
 #include <cstdbool>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_31
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_31 &' >> %t.sh
+// RUN: echo 'TEST_31=$!' >> %t.sh
+// RUN: echo "wait $TEST_15" >> %t.sh
 #if defined(TEST_31)
 #include <cstddef>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_32
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_32 &' >> %t.sh
+// RUN: echo 'TEST_32=$!' >> %t.sh
+// RUN: echo "wait $TEST_16" >> %t.sh
 #if defined(TEST_32)
 #include <cstdint>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_33
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_33 &' >> %t.sh
+// RUN: echo 'TEST_33=$!' >> %t.sh
+// RUN: echo "wait $TEST_17" >> %t.sh
 #if defined(TEST_33)
 #include <cstdio>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_34
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_34 &' >> %t.sh
+// RUN: echo 'TEST_34=$!' >> %t.sh
+// RUN: echo "wait $TEST_18" >> %t.sh
 #if defined(TEST_34)
 #include <cstdlib>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_35
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_35 &' >> %t.sh
+// RUN: echo 'TEST_35=$!' >> %t.sh
+// RUN: echo "wait $TEST_19" >> %t.sh
 #if defined(TEST_35)
 #include <cstring>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_36
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_36 &' >> %t.sh
+// RUN: echo 'TEST_36=$!' >> %t.sh
+// RUN: echo "wait $TEST_20" >> %t.sh
 #if defined(TEST_36)
 #include <ctgmath>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_37
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_37 &' >> %t.sh
+// RUN: echo 'TEST_37=$!' >> %t.sh
+// RUN: echo "wait $TEST_21" >> %t.sh
 #if defined(TEST_37)
 #include <ctime>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_38
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_38 &' >> %t.sh
+// RUN: echo 'TEST_38=$!' >> %t.sh
+// RUN: echo "wait $TEST_22" >> %t.sh
 #if defined(TEST_38)
 #include <ctype.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_39
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_39 &' >> %t.sh
+// RUN: echo 'TEST_39=$!' >> %t.sh
+// RUN: echo "wait $TEST_23" >> %t.sh
 #if defined(TEST_39)
 #include <cuchar>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_40
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_40 &' >> %t.sh
+// RUN: echo 'TEST_40=$!' >> %t.sh
+// RUN: echo "wait $TEST_24" >> %t.sh
 #if defined(TEST_40) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #include <cwchar>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_41
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_41 &' >> %t.sh
+// RUN: echo 'TEST_41=$!' >> %t.sh
+// RUN: echo "wait $TEST_25" >> %t.sh
 #if defined(TEST_41) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #include <cwctype>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_42
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_42 &' >> %t.sh
+// RUN: echo 'TEST_42=$!' >> %t.sh
+// RUN: echo "wait $TEST_26" >> %t.sh
 #if defined(TEST_42)
 #include <deque>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_43
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_43 &' >> %t.sh
+// RUN: echo 'TEST_43=$!' >> %t.sh
+// RUN: echo "wait $TEST_27" >> %t.sh
 #if defined(TEST_43)
 #include <errno.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_44
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_44 &' >> %t.sh
+// RUN: echo 'TEST_44=$!' >> %t.sh
+// RUN: echo "wait $TEST_28" >> %t.sh
 #if defined(TEST_44)
 #include <exception>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_45
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_45 &' >> %t.sh
+// RUN: echo 'TEST_45=$!' >> %t.sh
+// RUN: echo "wait $TEST_29" >> %t.sh
 #if defined(TEST_45)
 #include <execution>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_46
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_46 &' >> %t.sh
+// RUN: echo 'TEST_46=$!' >> %t.sh
+// RUN: echo "wait $TEST_30" >> %t.sh
 #if defined(TEST_46)
 #include <expected>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_47
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_47 &' >> %t.sh
+// RUN: echo 'TEST_47=$!' >> %t.sh
+// RUN: echo "wait $TEST_31" >> %t.sh
 #if defined(TEST_47)
 #include <fenv.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_48
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_48 &' >> %t.sh
+// RUN: echo 'TEST_48=$!' >> %t.sh
+// RUN: echo "wait $TEST_32" >> %t.sh
 #if defined(TEST_48) && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
 #include <filesystem>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_49
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_49 &' >> %t.sh
+// RUN: echo 'TEST_49=$!' >> %t.sh
+// RUN: echo "wait $TEST_33" >> %t.sh
 #if defined(TEST_49)
 #include <float.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_50
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_50 &' >> %t.sh
+// RUN: echo 'TEST_50=$!' >> %t.sh
+// RUN: echo "wait $TEST_34" >> %t.sh
 #if defined(TEST_50)
 #include <format>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_51
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_51 &' >> %t.sh
+// RUN: echo 'TEST_51=$!' >> %t.sh
+// RUN: echo "wait $TEST_35" >> %t.sh
 #if defined(TEST_51)
 #include <forward_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_52
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_52 &' >> %t.sh
+// RUN: echo 'TEST_52=$!' >> %t.sh
+// RUN: echo "wait $TEST_36" >> %t.sh
 #if defined(TEST_52) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && !defined(_LIBCPP_HAS_NO_FSTREAM)
 #include <fstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_53
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_53 &' >> %t.sh
+// RUN: echo 'TEST_53=$!' >> %t.sh
+// RUN: echo "wait $TEST_37" >> %t.sh
 #if defined(TEST_53)
 #include <functional>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_54
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_54 &' >> %t.sh
+// RUN: echo 'TEST_54=$!' >> %t.sh
+// RUN: echo "wait $TEST_38" >> %t.sh
 #if defined(TEST_54) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <future>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_55
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_55 &' >> %t.sh
+// RUN: echo 'TEST_55=$!' >> %t.sh
+// RUN: echo "wait $TEST_39" >> %t.sh
 #if defined(TEST_55)
 #include <initializer_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_56
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_56 &' >> %t.sh
+// RUN: echo 'TEST_56=$!' >> %t.sh
+// RUN: echo "wait $TEST_40" >> %t.sh
 #if defined(TEST_56)
 #include <inttypes.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_57
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_57 &' >> %t.sh
+// RUN: echo 'TEST_57=$!' >> %t.sh
+// RUN: echo "wait $TEST_41" >> %t.sh
 #if defined(TEST_57) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <iomanip>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_58
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_58 &' >> %t.sh
+// RUN: echo 'TEST_58=$!' >> %t.sh
+// RUN: echo "wait $TEST_42" >> %t.sh
 #if defined(TEST_58) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <ios>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_59
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_59 &' >> %t.sh
+// RUN: echo 'TEST_59=$!' >> %t.sh
+// RUN: echo "wait $TEST_43" >> %t.sh
 #if defined(TEST_59)
 #include <iosfwd>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_60
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_60 &' >> %t.sh
+// RUN: echo 'TEST_60=$!' >> %t.sh
+// RUN: echo "wait $TEST_44" >> %t.sh
 #if defined(TEST_60) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <iostream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_61
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_61 &' >> %t.sh
+// RUN: echo 'TEST_61=$!' >> %t.sh
+// RUN: echo "wait $TEST_45" >> %t.sh
 #if defined(TEST_61) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <istream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_62
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_62 &' >> %t.sh
+// RUN: echo 'TEST_62=$!' >> %t.sh
+// RUN: echo "wait $TEST_46" >> %t.sh
 #if defined(TEST_62)
 #include <iterator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_63
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_63 &' >> %t.sh
+// RUN: echo 'TEST_63=$!' >> %t.sh
+// RUN: echo "wait $TEST_47" >> %t.sh
 #if defined(TEST_63) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <latch>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_64
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_64 &' >> %t.sh
+// RUN: echo 'TEST_64=$!' >> %t.sh
+// RUN: echo "wait $TEST_48" >> %t.sh
 #if defined(TEST_64)
 #include <limits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_65
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_65 &' >> %t.sh
+// RUN: echo 'TEST_65=$!' >> %t.sh
+// RUN: echo "wait $TEST_49" >> %t.sh
 #if defined(TEST_65)
 #include <limits.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_66
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_66 &' >> %t.sh
+// RUN: echo 'TEST_66=$!' >> %t.sh
+// RUN: echo "wait $TEST_50" >> %t.sh
 #if defined(TEST_66)
 #include <list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_67
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_67 &' >> %t.sh
+// RUN: echo 'TEST_67=$!' >> %t.sh
+// RUN: echo "wait $TEST_51" >> %t.sh
 #if defined(TEST_67) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <locale>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_68
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_68 &' >> %t.sh
+// RUN: echo 'TEST_68=$!' >> %t.sh
+// RUN: echo "wait $TEST_52" >> %t.sh
 #if defined(TEST_68) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <locale.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_69
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_69 &' >> %t.sh
+// RUN: echo 'TEST_69=$!' >> %t.sh
+// RUN: echo "wait $TEST_53" >> %t.sh
 #if defined(TEST_69)
 #include <map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_70
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_70 &' >> %t.sh
+// RUN: echo 'TEST_70=$!' >> %t.sh
+// RUN: echo "wait $TEST_54" >> %t.sh
 #if defined(TEST_70)
 #include <math.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_71
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_71 &' >> %t.sh
+// RUN: echo 'TEST_71=$!' >> %t.sh
+// RUN: echo "wait $TEST_55" >> %t.sh
 #if defined(TEST_71)
 #include <memory>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_72
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_72 &' >> %t.sh
+// RUN: echo 'TEST_72=$!' >> %t.sh
+// RUN: echo "wait $TEST_56" >> %t.sh
 #if defined(TEST_72)
 #include <memory_resource>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_73
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_73 &' >> %t.sh
+// RUN: echo 'TEST_73=$!' >> %t.sh
+// RUN: echo "wait $TEST_57" >> %t.sh
 #if defined(TEST_73) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <mutex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_74
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_74 &' >> %t.sh
+// RUN: echo 'TEST_74=$!' >> %t.sh
+// RUN: echo "wait $TEST_58" >> %t.sh
 #if defined(TEST_74)
 #include <new>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_75
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_75 &' >> %t.sh
+// RUN: echo 'TEST_75=$!' >> %t.sh
+// RUN: echo "wait $TEST_59" >> %t.sh
 #if defined(TEST_75)
 #include <numbers>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_76
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_76 &' >> %t.sh
+// RUN: echo 'TEST_76=$!' >> %t.sh
+// RUN: echo "wait $TEST_60" >> %t.sh
 #if defined(TEST_76)
 #include <numeric>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_77
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_77 &' >> %t.sh
+// RUN: echo 'TEST_77=$!' >> %t.sh
+// RUN: echo "wait $TEST_61" >> %t.sh
 #if defined(TEST_77)
 #include <optional>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_78
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_78 &' >> %t.sh
+// RUN: echo 'TEST_78=$!' >> %t.sh
+// RUN: echo "wait $TEST_62" >> %t.sh
 #if defined(TEST_78) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <ostream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_79
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_79 &' >> %t.sh
+// RUN: echo 'TEST_79=$!' >> %t.sh
+// RUN: echo "wait $TEST_63" >> %t.sh
 #if defined(TEST_79)
 #include <queue>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_80
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_80 &' >> %t.sh
+// RUN: echo 'TEST_80=$!' >> %t.sh
+// RUN: echo "wait $TEST_64" >> %t.sh
 #if defined(TEST_80)
 #include <random>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_81
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_81 &' >> %t.sh
+// RUN: echo 'TEST_81=$!' >> %t.sh
+// RUN: echo "wait $TEST_65" >> %t.sh
 #if defined(TEST_81)
 #include <ranges>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_82
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_82 &' >> %t.sh
+// RUN: echo 'TEST_82=$!' >> %t.sh
+// RUN: echo "wait $TEST_66" >> %t.sh
 #if defined(TEST_82)
 #include <ratio>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_83
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_83 &' >> %t.sh
+// RUN: echo 'TEST_83=$!' >> %t.sh
+// RUN: echo "wait $TEST_67" >> %t.sh
 #if defined(TEST_83) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <regex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_84
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_84 &' >> %t.sh
+// RUN: echo 'TEST_84=$!' >> %t.sh
+// RUN: echo "wait $TEST_68" >> %t.sh
 #if defined(TEST_84)
 #include <scoped_allocator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_85
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_85 &' >> %t.sh
+// RUN: echo 'TEST_85=$!' >> %t.sh
+// RUN: echo "wait $TEST_69" >> %t.sh
 #if defined(TEST_85) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <semaphore>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_86
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_86 &' >> %t.sh
+// RUN: echo 'TEST_86=$!' >> %t.sh
+// RUN: echo "wait $TEST_70" >> %t.sh
 #if defined(TEST_86)
 #include <set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_87
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_87 &' >> %t.sh
+// RUN: echo 'TEST_87=$!' >> %t.sh
+// RUN: echo "wait $TEST_71" >> %t.sh
 #if defined(TEST_87)
 #include <setjmp.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_88
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_88 &' >> %t.sh
+// RUN: echo 'TEST_88=$!' >> %t.sh
+// RUN: echo "wait $TEST_72" >> %t.sh
 #if defined(TEST_88) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <shared_mutex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_89
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_89 &' >> %t.sh
+// RUN: echo 'TEST_89=$!' >> %t.sh
+// RUN: echo "wait $TEST_73" >> %t.sh
 #if defined(TEST_89)
 #include <source_location>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_90
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_90 &' >> %t.sh
+// RUN: echo 'TEST_90=$!' >> %t.sh
+// RUN: echo "wait $TEST_74" >> %t.sh
 #if defined(TEST_90)
 #include <span>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_91
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_91 &' >> %t.sh
+// RUN: echo 'TEST_91=$!' >> %t.sh
+// RUN: echo "wait $TEST_75" >> %t.sh
 #if defined(TEST_91) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <sstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_92
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_92 &' >> %t.sh
+// RUN: echo 'TEST_92=$!' >> %t.sh
+// RUN: echo "wait $TEST_76" >> %t.sh
 #if defined(TEST_92)
 #include <stack>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_93
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_93 &' >> %t.sh
+// RUN: echo 'TEST_93=$!' >> %t.sh
+// RUN: echo "wait $TEST_77" >> %t.sh
 #if defined(TEST_93) && __cplusplus > 202002L && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <stdatomic.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_94
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_94 &' >> %t.sh
+// RUN: echo 'TEST_94=$!' >> %t.sh
+// RUN: echo "wait $TEST_78" >> %t.sh
 #if defined(TEST_94)
 #include <stdbool.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_95
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_95 &' >> %t.sh
+// RUN: echo 'TEST_95=$!' >> %t.sh
+// RUN: echo "wait $TEST_79" >> %t.sh
 #if defined(TEST_95)
 #include <stddef.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_96
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_96 &' >> %t.sh
+// RUN: echo 'TEST_96=$!' >> %t.sh
+// RUN: echo "wait $TEST_80" >> %t.sh
 #if defined(TEST_96)
 #include <stdexcept>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_97
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_97 &' >> %t.sh
+// RUN: echo 'TEST_97=$!' >> %t.sh
+// RUN: echo "wait $TEST_81" >> %t.sh
 #if defined(TEST_97)
 #include <stdint.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_98
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_98 &' >> %t.sh
+// RUN: echo 'TEST_98=$!' >> %t.sh
+// RUN: echo "wait $TEST_82" >> %t.sh
 #if defined(TEST_98)
 #include <stdio.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_99
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_99 &' >> %t.sh
+// RUN: echo 'TEST_99=$!' >> %t.sh
+// RUN: echo "wait $TEST_83" >> %t.sh
 #if defined(TEST_99)
 #include <stdlib.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_100
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_100 &' >> %t.sh
+// RUN: echo 'TEST_100=$!' >> %t.sh
+// RUN: echo "wait $TEST_84" >> %t.sh
 #if defined(TEST_100) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <streambuf>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_101
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_101 &' >> %t.sh
+// RUN: echo 'TEST_101=$!' >> %t.sh
+// RUN: echo "wait $TEST_85" >> %t.sh
 #if defined(TEST_101)
 #include <string>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_102
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_102 &' >> %t.sh
+// RUN: echo 'TEST_102=$!' >> %t.sh
+// RUN: echo "wait $TEST_86" >> %t.sh
 #if defined(TEST_102)
 #include <string.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_103
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_103 &' >> %t.sh
+// RUN: echo 'TEST_103=$!' >> %t.sh
+// RUN: echo "wait $TEST_87" >> %t.sh
 #if defined(TEST_103)
 #include <string_view>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_104
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_104 &' >> %t.sh
+// RUN: echo 'TEST_104=$!' >> %t.sh
+// RUN: echo "wait $TEST_88" >> %t.sh
 #if defined(TEST_104) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #include <strstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_105
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_105 &' >> %t.sh
+// RUN: echo 'TEST_105=$!' >> %t.sh
+// RUN: echo "wait $TEST_89" >> %t.sh
 #if defined(TEST_105)
 #include <system_error>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_106
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_106 &' >> %t.sh
+// RUN: echo 'TEST_106=$!' >> %t.sh
+// RUN: echo "wait $TEST_90" >> %t.sh
 #if defined(TEST_106)
 #include <tgmath.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_107
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_107 &' >> %t.sh
+// RUN: echo 'TEST_107=$!' >> %t.sh
+// RUN: echo "wait $TEST_91" >> %t.sh
 #if defined(TEST_107) && !defined(_LIBCPP_HAS_NO_THREADS)
 #include <thread>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_108
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_108 &' >> %t.sh
+// RUN: echo 'TEST_108=$!' >> %t.sh
+// RUN: echo "wait $TEST_92" >> %t.sh
 #if defined(TEST_108)
 #include <tuple>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_109
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_109 &' >> %t.sh
+// RUN: echo 'TEST_109=$!' >> %t.sh
+// RUN: echo "wait $TEST_93" >> %t.sh
 #if defined(TEST_109)
 #include <type_traits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_110
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_110 &' >> %t.sh
+// RUN: echo 'TEST_110=$!' >> %t.sh
+// RUN: echo "wait $TEST_94" >> %t.sh
 #if defined(TEST_110)
 #include <typeindex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_111
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_111 &' >> %t.sh
+// RUN: echo 'TEST_111=$!' >> %t.sh
+// RUN: echo "wait $TEST_95" >> %t.sh
 #if defined(TEST_111)
 #include <typeinfo>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_112
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_112 &' >> %t.sh
+// RUN: echo 'TEST_112=$!' >> %t.sh
+// RUN: echo "wait $TEST_96" >> %t.sh
 #if defined(TEST_112)
 #include <uchar.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_113
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_113 &' >> %t.sh
+// RUN: echo 'TEST_113=$!' >> %t.sh
+// RUN: echo "wait $TEST_97" >> %t.sh
 #if defined(TEST_113)
 #include <unordered_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_114
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_114 &' >> %t.sh
+// RUN: echo 'TEST_114=$!' >> %t.sh
+// RUN: echo "wait $TEST_98" >> %t.sh
 #if defined(TEST_114)
 #include <unordered_set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_115
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_115 &' >> %t.sh
+// RUN: echo 'TEST_115=$!' >> %t.sh
+// RUN: echo "wait $TEST_99" >> %t.sh
 #if defined(TEST_115)
 #include <utility>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_116
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_116 &' >> %t.sh
+// RUN: echo 'TEST_116=$!' >> %t.sh
+// RUN: echo "wait $TEST_100" >> %t.sh
 #if defined(TEST_116)
 #include <valarray>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_117
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_117 &' >> %t.sh
+// RUN: echo 'TEST_117=$!' >> %t.sh
+// RUN: echo "wait $TEST_101" >> %t.sh
 #if defined(TEST_117)
 #include <variant>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_118
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_118 &' >> %t.sh
+// RUN: echo 'TEST_118=$!' >> %t.sh
+// RUN: echo "wait $TEST_102" >> %t.sh
 #if defined(TEST_118)
 #include <vector>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_119
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_119 &' >> %t.sh
+// RUN: echo 'TEST_119=$!' >> %t.sh
+// RUN: echo "wait $TEST_103" >> %t.sh
 #if defined(TEST_119)
 #include <version>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_120
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_120 &' >> %t.sh
+// RUN: echo 'TEST_120=$!' >> %t.sh
+// RUN: echo "wait $TEST_104" >> %t.sh
 #if defined(TEST_120) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #include <wchar.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_121
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_121 &' >> %t.sh
+// RUN: echo 'TEST_121=$!' >> %t.sh
+// RUN: echo "wait $TEST_105" >> %t.sh
 #if defined(TEST_121) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #include <wctype.h>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_122
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_122 &' >> %t.sh
+// RUN: echo 'TEST_122=$!' >> %t.sh
+// RUN: echo "wait $TEST_106" >> %t.sh
 #if defined(TEST_122) && __cplusplus >= 201103L
-#include <experimental/algorithm>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_123
-#if defined(TEST_123) && __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#include <experimental/coroutine>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_124
-#if defined(TEST_124) && __cplusplus >= 201103L
 #include <experimental/deque>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_125
-#if defined(TEST_125) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_123 &' >> %t.sh
+// RUN: echo 'TEST_123=$!' >> %t.sh
+// RUN: echo "wait $TEST_107" >> %t.sh
+#if defined(TEST_123) && __cplusplus >= 201103L
 #include <experimental/forward_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_126
-#if defined(TEST_126) && __cplusplus >= 201103L
-#include <experimental/functional>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_127
-#if defined(TEST_127) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_124 &' >> %t.sh
+// RUN: echo 'TEST_124=$!' >> %t.sh
+// RUN: echo "wait $TEST_108" >> %t.sh
+#if defined(TEST_124) && __cplusplus >= 201103L
 #include <experimental/iterator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_128
-#if defined(TEST_128) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_125 &' >> %t.sh
+// RUN: echo 'TEST_125=$!' >> %t.sh
+// RUN: echo "wait $TEST_109" >> %t.sh
+#if defined(TEST_125) && __cplusplus >= 201103L
 #include <experimental/list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_129
-#if defined(TEST_129) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_126 &' >> %t.sh
+// RUN: echo 'TEST_126=$!' >> %t.sh
+// RUN: echo "wait $TEST_110" >> %t.sh
+#if defined(TEST_126) && __cplusplus >= 201103L
 #include <experimental/map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_130
-#if defined(TEST_130) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_127 &' >> %t.sh
+// RUN: echo 'TEST_127=$!' >> %t.sh
+// RUN: echo "wait $TEST_111" >> %t.sh
+#if defined(TEST_127) && __cplusplus >= 201103L
 #include <experimental/memory_resource>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_131
-#if defined(TEST_131) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_128 &' >> %t.sh
+// RUN: echo 'TEST_128=$!' >> %t.sh
+// RUN: echo "wait $TEST_112" >> %t.sh
+#if defined(TEST_128) && __cplusplus >= 201103L
 #include <experimental/propagate_const>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_132
-#if defined(TEST_132) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_129 &' >> %t.sh
+// RUN: echo 'TEST_129=$!' >> %t.sh
+// RUN: echo "wait $TEST_113" >> %t.sh
+#if defined(TEST_129) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && __cplusplus >= 201103L
 #include <experimental/regex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_133
-#if defined(TEST_133) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_130 &' >> %t.sh
+// RUN: echo 'TEST_130=$!' >> %t.sh
+// RUN: echo "wait $TEST_114" >> %t.sh
+#if defined(TEST_130) && __cplusplus >= 201103L
 #include <experimental/set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_134
-#if defined(TEST_134) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_131 &' >> %t.sh
+// RUN: echo 'TEST_131=$!' >> %t.sh
+// RUN: echo "wait $TEST_115" >> %t.sh
+#if defined(TEST_131) && __cplusplus >= 201103L
 #include <experimental/simd>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_135
-#if defined(TEST_135) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_132 &' >> %t.sh
+// RUN: echo 'TEST_132=$!' >> %t.sh
+// RUN: echo "wait $TEST_116" >> %t.sh
+#if defined(TEST_132) && __cplusplus >= 201103L
 #include <experimental/string>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_136
-#if defined(TEST_136) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_133 &' >> %t.sh
+// RUN: echo 'TEST_133=$!' >> %t.sh
+// RUN: echo "wait $TEST_117" >> %t.sh
+#if defined(TEST_133) && __cplusplus >= 201103L
 #include <experimental/type_traits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_137
-#if defined(TEST_137) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_134 &' >> %t.sh
+// RUN: echo 'TEST_134=$!' >> %t.sh
+// RUN: echo "wait $TEST_118" >> %t.sh
+#if defined(TEST_134) && __cplusplus >= 201103L
 #include <experimental/unordered_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_138
-#if defined(TEST_138) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_135 &' >> %t.sh
+// RUN: echo 'TEST_135=$!' >> %t.sh
+// RUN: echo "wait $TEST_119" >> %t.sh
+#if defined(TEST_135) && __cplusplus >= 201103L
 #include <experimental/unordered_set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_139
-#if defined(TEST_139) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_136 &' >> %t.sh
+// RUN: echo 'TEST_136=$!' >> %t.sh
+// RUN: echo "wait $TEST_120" >> %t.sh
+#if defined(TEST_136) && __cplusplus >= 201103L
 #include <experimental/utility>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_140
-#if defined(TEST_140) && __cplusplus >= 201103L
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_137 &' >> %t.sh
+// RUN: echo 'TEST_137=$!' >> %t.sh
+// RUN: echo "wait $TEST_121" >> %t.sh
+#if defined(TEST_137) && __cplusplus >= 201103L
 #include <experimental/vector>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_141
-#if defined(TEST_141)
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_138 &' >> %t.sh
+// RUN: echo 'TEST_138=$!' >> %t.sh
+// RUN: echo "wait $TEST_122" >> %t.sh
+#if defined(TEST_138)
 #include <ext/hash_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_142
-#if defined(TEST_142)
+// RUN: echo '%{cxx} %s %{flags} %{compile_flags} -fmodules -fcxx-modules -fmodules-cache-path=%t -fsyntax-only -DTEST_139 &' >> %t.sh
+// RUN: echo 'TEST_139=$!' >> %t.sh
+// RUN: echo "wait $TEST_123" >> %t.sh
+#if defined(TEST_139)
 #include <ext/hash_set>
 #endif
+// RUN: echo "wait $TEST_124" >> %t.sh
+// RUN: echo "wait $TEST_125" >> %t.sh
+// RUN: echo "wait $TEST_126" >> %t.sh
+// RUN: echo "wait $TEST_127" >> %t.sh
+// RUN: echo "wait $TEST_128" >> %t.sh
+// RUN: echo "wait $TEST_129" >> %t.sh
+// RUN: echo "wait $TEST_130" >> %t.sh
+// RUN: echo "wait $TEST_131" >> %t.sh
+// RUN: echo "wait $TEST_132" >> %t.sh
+// RUN: echo "wait $TEST_133" >> %t.sh
+// RUN: echo "wait $TEST_134" >> %t.sh
+// RUN: echo "wait $TEST_135" >> %t.sh
+// RUN: echo "wait $TEST_136" >> %t.sh
+// RUN: echo "wait $TEST_137" >> %t.sh
+// RUN: echo "wait $TEST_138" >> %t.sh
+// RUN: echo "wait $TEST_139" >> %t.sh
+// RUN: bash %t.sh
 // GENERATED-MARKER
diff --git a/third_party/llvm-project/libcxx/test/libcxx/nasty_macros.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/nasty_macros.compile.pass.cpp
index 7896b5e..3e3e134 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/nasty_macros.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/nasty_macros.compile.pass.cpp
@@ -9,9 +9,6 @@
 // Test that headers are not tripped up by the surrounding code defining various
 // alphabetic macros.
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // Prevent <ext/hash_map> from generating deprecated warnings for this test.
 #if defined(__DEPRECATED)
 #    undef __DEPRECATED
@@ -340,21 +337,12 @@
 #   include <wctype.h>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/algorithm>
-#endif
-#if __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/deque>
 #endif
 #if __cplusplus >= 201103L
 #   include <experimental/forward_list>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/functional>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/iterator>
 #endif
 #if __cplusplus >= 201103L
diff --git a/third_party/llvm-project/libcxx/test/libcxx/no_assert_include.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/no_assert_include.compile.pass.cpp
index ce94592..f92b787 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/no_assert_include.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/no_assert_include.compile.pass.cpp
@@ -9,9 +9,6 @@
 // Ensure that none of the standard C++ headers implicitly include cassert or
 // assert.h (because assert() is implemented as a macro).
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // Prevent <ext/hash_map> from generating deprecated warnings for this test.
 #if defined(__DEPRECATED)
 #    undef __DEPRECATED
@@ -213,21 +210,12 @@
 #   include <wctype.h>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/algorithm>
-#endif
-#if __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
-#   include <experimental/coroutine>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/deque>
 #endif
 #if __cplusplus >= 201103L
 #   include <experimental/forward_list>
 #endif
 #if __cplusplus >= 201103L
-#   include <experimental/functional>
-#endif
-#if __cplusplus >= 201103L
 #   include <experimental/iterator>
 #endif
 #if __cplusplus >= 201103L
diff --git a/third_party/llvm-project/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
index 054a682..3029487 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
@@ -40,10 +40,10 @@
     test<long>();
     test<long long>();
 
-    test<int8_t>();
-    test<int16_t>();
-    test<int32_t>();
-    test<int64_t>();
+    test<std::int8_t>();
+    test<std::int16_t>();
+    test<std::int32_t>();
+    test<std::int64_t>();
 
     test<unsigned char>();
     test<unsigned short>();
@@ -51,10 +51,10 @@
     test<unsigned long>();
     test<unsigned long long>();
 
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
 
 #ifndef TEST_HAS_NO_INT128
     test<__int128_t>();
@@ -62,8 +62,8 @@
 #endif
 
     test<char>();
-    test<ptrdiff_t>();
-    test<size_t>();
+    test<std::ptrdiff_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/numerics/rand/rand.device/has-no-random-device.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/numerics/rand/rand.device/has-no-random-device.verify.cpp
index 7559c88..03d5927 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/numerics/rand/rand.device/has-no-random-device.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/numerics/rand/rand.device/has-no-random-device.verify.cpp
@@ -13,7 +13,6 @@
 
 #include <random>
 
-int main(int, char**) {
+void f() {
   std::random_device d; // expected-error {{no type named 'random_device' in namespace 'std'}}
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/private_headers.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/private_headers.verify.cpp
index ebbd50b..e201605 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/private_headers.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/private_headers.verify.cpp
@@ -81,6 +81,7 @@
 #include <__algorithm/iter_swap.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/iter_swap.h'}}
 #include <__algorithm/iterator_operations.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/iterator_operations.h'}}
 #include <__algorithm/lexicographical_compare.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/lexicographical_compare.h'}}
+#include <__algorithm/lexicographical_compare_three_way.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/lexicographical_compare_three_way.h'}}
 #include <__algorithm/lower_bound.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/lower_bound.h'}}
 #include <__algorithm/make_heap.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/make_heap.h'}}
 #include <__algorithm/make_projected.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/make_projected.h'}}
@@ -220,6 +221,7 @@
 #include <__algorithm/stable_partition.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/stable_partition.h'}}
 #include <__algorithm/stable_sort.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/stable_sort.h'}}
 #include <__algorithm/swap_ranges.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/swap_ranges.h'}}
+#include <__algorithm/three_way_comp_ref_type.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/three_way_comp_ref_type.h'}}
 #include <__algorithm/transform.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/transform.h'}}
 #include <__algorithm/uniform_random_bit_generator_adaptor.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/uniform_random_bit_generator_adaptor.h'}}
 #include <__algorithm/unique.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unique.h'}}
@@ -227,6 +229,20 @@
 #include <__algorithm/unwrap_iter.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unwrap_iter.h'}}
 #include <__algorithm/unwrap_range.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unwrap_range.h'}}
 #include <__algorithm/upper_bound.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/upper_bound.h'}}
+#include <__atomic/aliases.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/aliases.h'}}
+#include <__atomic/atomic.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic.h'}}
+#include <__atomic/atomic_base.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic_base.h'}}
+#include <__atomic/atomic_flag.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic_flag.h'}}
+#include <__atomic/atomic_init.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic_init.h'}}
+#include <__atomic/atomic_lock_free.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic_lock_free.h'}}
+#include <__atomic/atomic_sync.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/atomic_sync.h'}}
+#include <__atomic/check_memory_order.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/check_memory_order.h'}}
+#include <__atomic/contention_t.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/contention_t.h'}}
+#include <__atomic/cxx_atomic_impl.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/cxx_atomic_impl.h'}}
+#include <__atomic/fence.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/fence.h'}}
+#include <__atomic/is_always_lock_free.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/is_always_lock_free.h'}}
+#include <__atomic/kill_dependency.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/kill_dependency.h'}}
+#include <__atomic/memory_order.h> // expected-error@*:* {{use of private header from outside its module: '__atomic/memory_order.h'}}
 #include <__availability> // expected-error@*:* {{use of private header from outside its module: '__availability'}}
 #include <__bit/bit_cast.h> // expected-error@*:* {{use of private header from outside its module: '__bit/bit_cast.h'}}
 #include <__bit/bit_ceil.h> // expected-error@*:* {{use of private header from outside its module: '__bit/bit_ceil.h'}}
@@ -243,11 +259,17 @@
 #include <__bit/rotate.h> // expected-error@*:* {{use of private header from outside its module: '__bit/rotate.h'}}
 #include <__bit_reference> // expected-error@*:* {{use of private header from outside its module: '__bit_reference'}}
 #include <__charconv/chars_format.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/chars_format.h'}}
+#include <__charconv/from_chars_integral.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/from_chars_integral.h'}}
 #include <__charconv/from_chars_result.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/from_chars_result.h'}}
 #include <__charconv/tables.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/tables.h'}}
+#include <__charconv/to_chars.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/to_chars.h'}}
 #include <__charconv/to_chars_base_10.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/to_chars_base_10.h'}}
+#include <__charconv/to_chars_floating_point.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/to_chars_floating_point.h'}}
+#include <__charconv/to_chars_integral.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/to_chars_integral.h'}}
 #include <__charconv/to_chars_result.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/to_chars_result.h'}}
+#include <__charconv/traits.h> // expected-error@*:* {{use of private header from outside its module: '__charconv/traits.h'}}
 #include <__chrono/calendar.h> // expected-error@*:* {{use of private header from outside its module: '__chrono/calendar.h'}}
+#include <__chrono/concepts.h> // expected-error@*:* {{use of private header from outside its module: '__chrono/concepts.h'}}
 #include <__chrono/convert_to_timespec.h> // expected-error@*:* {{use of private header from outside its module: '__chrono/convert_to_timespec.h'}}
 #include <__chrono/convert_to_tm.h> // expected-error@*:* {{use of private header from outside its module: '__chrono/convert_to_tm.h'}}
 #include <__chrono/day.h> // expected-error@*:* {{use of private header from outside its module: '__chrono/day.h'}}
@@ -306,12 +328,17 @@
 #include <__concepts/semiregular.h> // expected-error@*:* {{use of private header from outside its module: '__concepts/semiregular.h'}}
 #include <__concepts/swappable.h> // expected-error@*:* {{use of private header from outside its module: '__concepts/swappable.h'}}
 #include <__concepts/totally_ordered.h> // expected-error@*:* {{use of private header from outside its module: '__concepts/totally_ordered.h'}}
+#include <__condition_variable/condition_variable.h> // expected-error@*:* {{use of private header from outside its module: '__condition_variable/condition_variable.h'}}
 #include <__coroutine/coroutine_handle.h> // expected-error@*:* {{use of private header from outside its module: '__coroutine/coroutine_handle.h'}}
 #include <__coroutine/coroutine_traits.h> // expected-error@*:* {{use of private header from outside its module: '__coroutine/coroutine_traits.h'}}
 #include <__coroutine/noop_coroutine_handle.h> // expected-error@*:* {{use of private header from outside its module: '__coroutine/noop_coroutine_handle.h'}}
 #include <__coroutine/trivial_awaitables.h> // expected-error@*:* {{use of private header from outside its module: '__coroutine/trivial_awaitables.h'}}
 #include <__debug_utils/randomize_range.h> // expected-error@*:* {{use of private header from outside its module: '__debug_utils/randomize_range.h'}}
-#include <__errc> // expected-error@*:* {{use of private header from outside its module: '__errc'}}
+#include <__exception/exception.h> // expected-error@*:* {{use of private header from outside its module: '__exception/exception.h'}}
+#include <__exception/exception_ptr.h> // expected-error@*:* {{use of private header from outside its module: '__exception/exception_ptr.h'}}
+#include <__exception/nested_exception.h> // expected-error@*:* {{use of private header from outside its module: '__exception/nested_exception.h'}}
+#include <__exception/operations.h> // expected-error@*:* {{use of private header from outside its module: '__exception/operations.h'}}
+#include <__exception/terminate.h> // expected-error@*:* {{use of private header from outside its module: '__exception/terminate.h'}}
 #include <__expected/bad_expected_access.h> // expected-error@*:* {{use of private header from outside its module: '__expected/bad_expected_access.h'}}
 #include <__expected/expected.h> // expected-error@*:* {{use of private header from outside its module: '__expected/expected.h'}}
 #include <__expected/unexpect.h> // expected-error@*:* {{use of private header from outside its module: '__expected/unexpect.h'}}
@@ -445,6 +472,7 @@
 #include <__mbstate_t.h> // expected-error@*:* {{use of private header from outside its module: '__mbstate_t.h'}}
 #include <__memory/addressof.h> // expected-error@*:* {{use of private header from outside its module: '__memory/addressof.h'}}
 #include <__memory/align.h> // expected-error@*:* {{use of private header from outside its module: '__memory/align.h'}}
+#include <__memory/aligned_alloc.h> // expected-error@*:* {{use of private header from outside its module: '__memory/aligned_alloc.h'}}
 #include <__memory/allocate_at_least.h> // expected-error@*:* {{use of private header from outside its module: '__memory/allocate_at_least.h'}}
 #include <__memory/allocation_guard.h> // expected-error@*:* {{use of private header from outside its module: '__memory/allocation_guard.h'}}
 #include <__memory/allocator.h> // expected-error@*:* {{use of private header from outside its module: '__memory/allocator.h'}}
@@ -477,7 +505,10 @@
 #include <__memory_resource/pool_options.h> // expected-error@*:* {{use of private header from outside its module: '__memory_resource/pool_options.h'}}
 #include <__memory_resource/synchronized_pool_resource.h> // expected-error@*:* {{use of private header from outside its module: '__memory_resource/synchronized_pool_resource.h'}}
 #include <__memory_resource/unsynchronized_pool_resource.h> // expected-error@*:* {{use of private header from outside its module: '__memory_resource/unsynchronized_pool_resource.h'}}
-#include <__mutex_base> // expected-error@*:* {{use of private header from outside its module: '__mutex_base'}}
+#include <__mutex/lock_guard.h> // expected-error@*:* {{use of private header from outside its module: '__mutex/lock_guard.h'}}
+#include <__mutex/mutex.h> // expected-error@*:* {{use of private header from outside its module: '__mutex/mutex.h'}}
+#include <__mutex/tag_types.h> // expected-error@*:* {{use of private header from outside its module: '__mutex/tag_types.h'}}
+#include <__mutex/unique_lock.h> // expected-error@*:* {{use of private header from outside its module: '__mutex/unique_lock.h'}}
 #include <__node_handle> // expected-error@*:* {{use of private header from outside its module: '__node_handle'}}
 #include <__numeric/accumulate.h> // expected-error@*:* {{use of private header from outside its module: '__numeric/accumulate.h'}}
 #include <__numeric/adjacent_difference.h> // expected-error@*:* {{use of private header from outside its module: '__numeric/adjacent_difference.h'}}
@@ -568,21 +599,26 @@
 #include <__ranges/views.h> // expected-error@*:* {{use of private header from outside its module: '__ranges/views.h'}}
 #include <__ranges/zip_view.h> // expected-error@*:* {{use of private header from outside its module: '__ranges/zip_view.h'}}
 #include <__split_buffer> // expected-error@*:* {{use of private header from outside its module: '__split_buffer'}}
-#include <__std_stream> // expected-error@*:* {{use of private header from outside its module: '__std_stream'}}
 #include <__string/char_traits.h> // expected-error@*:* {{use of private header from outside its module: '__string/char_traits.h'}}
+#include <__string/constexpr_c_functions.h> // expected-error@*:* {{use of private header from outside its module: '__string/constexpr_c_functions.h'}}
 #include <__string/extern_template_lists.h> // expected-error@*:* {{use of private header from outside its module: '__string/extern_template_lists.h'}}
+#include <__system_error/errc.h> // expected-error@*:* {{use of private header from outside its module: '__system_error/errc.h'}}
+#include <__system_error/error_category.h> // expected-error@*:* {{use of private header from outside its module: '__system_error/error_category.h'}}
+#include <__system_error/error_code.h> // expected-error@*:* {{use of private header from outside its module: '__system_error/error_code.h'}}
+#include <__system_error/error_condition.h> // expected-error@*:* {{use of private header from outside its module: '__system_error/error_condition.h'}}
+#include <__system_error/system_error.h> // expected-error@*:* {{use of private header from outside its module: '__system_error/system_error.h'}}
 #include <__thread/poll_with_backoff.h> // expected-error@*:* {{use of private header from outside its module: '__thread/poll_with_backoff.h'}}
 #include <__thread/timed_backoff_policy.h> // expected-error@*:* {{use of private header from outside its module: '__thread/timed_backoff_policy.h'}}
-#include <__tuple_dir/apply_cv.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/apply_cv.h'}}
-#include <__tuple_dir/make_tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/make_tuple_types.h'}}
-#include <__tuple_dir/pair_like.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/pair_like.h'}}
-#include <__tuple_dir/sfinae_helpers.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/sfinae_helpers.h'}}
-#include <__tuple_dir/tuple_element.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_element.h'}}
-#include <__tuple_dir/tuple_indices.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_indices.h'}}
-#include <__tuple_dir/tuple_like.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_like.h'}}
-#include <__tuple_dir/tuple_like_ext.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_like_ext.h'}}
-#include <__tuple_dir/tuple_size.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_size.h'}}
-#include <__tuple_dir/tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple_dir/tuple_types.h'}}
+#include <__tuple/apply_cv.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/apply_cv.h'}}
+#include <__tuple/make_tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/make_tuple_types.h'}}
+#include <__tuple/pair_like.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/pair_like.h'}}
+#include <__tuple/sfinae_helpers.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/sfinae_helpers.h'}}
+#include <__tuple/tuple_element.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_element.h'}}
+#include <__tuple/tuple_indices.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_indices.h'}}
+#include <__tuple/tuple_like.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_like.h'}}
+#include <__tuple/tuple_like_ext.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_like_ext.h'}}
+#include <__tuple/tuple_size.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_size.h'}}
+#include <__tuple/tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_types.h'}}
 #include <__type_traits/add_const.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_const.h'}}
 #include <__type_traits/add_cv.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_cv.h'}}
 #include <__type_traits/add_lvalue_reference.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_lvalue_reference.h'}}
@@ -632,6 +668,7 @@
 #include <__type_traits/is_destructible.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_destructible.h'}}
 #include <__type_traits/is_empty.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_empty.h'}}
 #include <__type_traits/is_enum.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_enum.h'}}
+#include <__type_traits/is_equality_comparable.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_equality_comparable.h'}}
 #include <__type_traits/is_final.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_final.h'}}
 #include <__type_traits/is_floating_point.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_floating_point.h'}}
 #include <__type_traits/is_function.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/is_function.h'}}
@@ -696,6 +733,7 @@
 #include <__type_traits/nat.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/nat.h'}}
 #include <__type_traits/negation.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/negation.h'}}
 #include <__type_traits/noexcept_move_assign_container.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/noexcept_move_assign_container.h'}}
+#include <__type_traits/predicate_traits.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/predicate_traits.h'}}
 #include <__type_traits/promote.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/promote.h'}}
 #include <__type_traits/rank.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/rank.h'}}
 #include <__type_traits/remove_all_extents.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/remove_all_extents.h'}}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.adaptor.tuple/tuple-for-each.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.adaptor.tuple/tuple-for-each.pass.cpp
new file mode 100644
index 0000000..11176c7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.adaptor.tuple/tuple-for-each.pass.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// <ranges>
+
+// template<class F, class Tuple>
+// constexpr void tuple-for-each(F&& f, Tuple&& t) { // exposition only
+
+// LWG3755 tuple-for-each can call user-defined operator,
+
+#include <ranges>
+#include <tuple>
+#include <cstdlib>
+
+struct Evil {
+  void operator,(Evil) { std::abort(); }
+};
+
+int main(int, char**) {
+  std::tuple<int, int> t;
+  std::ranges::__tuple_for_each([](int) { return Evil{}; }, t);
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
index e9cd574..10d96a6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
@@ -13,7 +13,7 @@
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-exceptions
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <ranges>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.join/segmented_iterator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.join/segmented_iterator.compile.pass.cpp
new file mode 100644
index 0000000..82e8cab
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.join/segmented_iterator.compile.pass.cpp
@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
+
+#include <ranges>
+#include <utility>
+#include <vector>
+
+using JoinView = decltype(std::views::join(std::declval<std::vector<std::vector<int>>&>()));
+using JoinIter = std::ranges::iterator_t<JoinView>;
+static_assert(std::__is_segmented_iterator<JoinIter>::value);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/no_unique_address.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/no_unique_address.compile.pass.cpp
index 37cd715..2918d4f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/no_unique_address.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/no_unique_address.compile.pass.cpp
@@ -54,7 +54,7 @@
     int x;
     int* begin() const;
     int* end() const;
-    constexpr static size_t size() { return 1; }
+    constexpr static std::size_t size() { return 1; }
   };
   static_assert( std::ranges::forward_range<TinyView>);
   static_assert( std::ranges::__tiny_range<TinyView>);
@@ -107,7 +107,7 @@
   struct EmptyTinyView : std::ranges::view_base {
     int* begin() const;
     int* end() const;
-    constexpr static size_t size() { return 1; }
+    constexpr static std::size_t size() { return 1; }
   };
   static_assert( std::ranges::forward_range<EmptyTinyView>);
   static_assert( std::ranges::__tiny_range<EmptyTinyView>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/types.h b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/types.h
index a66b378..12b0de9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/types.h
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/range.adaptors/range.lazy.split/types.h
@@ -10,6 +10,7 @@
 #define TEST_LIBCXX_RANGES_RANGE_ADAPTORS_RANGE_LAZY_SPLIT_TYPES_H
 
 #include <concepts>
+#include <cstddef>
 #include <ranges>
 #include <string_view>
 #include "test_iterators.h"
@@ -53,7 +54,7 @@
   constexpr ForwardTinyView() = default;
   constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(nullptr); }
   constexpr forward_iterator<const char*> end() const { return forward_iterator<const char*>(nullptr); }
-  constexpr static size_t size() { return 1; }
+  constexpr static std::size_t size() { return 1; }
 };
 static_assert(std::ranges::forward_range<ForwardTinyView>);
 static_assert(std::ranges::view<ForwardTinyView>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/ranges/version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/ranges/version.compile.pass.cpp
index de955a9..4b3aa3f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/ranges/version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/ranges/version.compile.pass.cpp
@@ -16,6 +16,3 @@
 #ifndef _LIBCPP_VERSION
 #error _LIBCPP_VERSION not defined
 #endif
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-error.compile.pass.mm
similarity index 67%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-error.compile.pass.mm
index 92dc58c..04bb4cc 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-error.compile.pass.mm
@@ -6,16 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
+// REQUIRES: objective-c++
 
-#include <complex.h>
+// XFAIL: *
 
-#include "test_macros.h"
+// Make sure the test DOES NOT pass if it fails at compile-time
 
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
+struct Foo { };
+typedef Foo::x x;
 
-  return 0;
-}
+int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-success.compile.pass.mm
similarity index 72%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-success.compile.pass.mm
index b619499..9effc02 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/compile-success.compile.pass.mm
@@ -6,14 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <ciso646>
+// REQUIRES: objective-c++
 
-#include <ciso646>
+// Make sure the test passes if it succeeds to compile
 
-#include "test_macros.h"
+@interface I;
+@end
 
-int main(int, char**)
-{
-
-  return 0;
-}
+int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/link-error.compile.pass.mm
similarity index 63%
copy from third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/link-error.compile.pass.mm
index 1efeba1..77f6a63 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/link-error.compile.pass.mm
@@ -6,10 +6,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03
+// REQUIRES: objective-c++
 
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
+// Make sure the test passes even if there's a link error, i.e. it isn't linked.
+
+@interface I;
+@end
+
+extern void this_is_an_undefined_symbol();
+
 int main(int, char**) {
-  return 0;
+    this_is_an_undefined_symbol();
+    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/run-error.compile.pass.mm
similarity index 71%
rename from third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
rename to third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/run-error.compile.pass.mm
index 1efeba1..cdd3ef4 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/compile.pass.mm/run-error.compile.pass.mm
@@ -6,10 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03
+// REQUIRES: objective-c++
 
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
+// Make sure the test passes even if there's a runtime error, i.e. it isn't run.
+
+@interface I;
+@end
+
 int main(int, char**) {
-  return 0;
+    return 1;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/compile-error.link.pass.mm
similarity index 67%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/compile-error.link.pass.mm
index 92dc58c..6227641 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/compile-error.link.pass.mm
@@ -6,16 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
+// REQUIRES: objective-c++
 
-#include <complex.h>
+// XFAIL: *
 
-#include "test_macros.h"
+// Make sure the test DOES NOT pass if it fails at compile-time.
 
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
+struct Foo { };
+typedef Foo::x x;
 
-  return 0;
-}
+int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-error.link.pass.mm
similarity index 67%
copy from third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-error.link.pass.mm
index 1efeba1..e955942 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-error.link.pass.mm
@@ -6,10 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03
+// REQUIRES: objective-c++
 
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
+// XFAIL: *
+
+// Make sure the test DOES NOT pass if it fails to link.
+
+extern void this_is_an_undefined_symbol();
+
 int main(int, char**) {
-  return 0;
+    this_is_an_undefined_symbol();
+    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-success.link.pass.mm
similarity index 72%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-success.link.pass.mm
index b619499..a831d7f 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/link-success.link.pass.mm
@@ -6,14 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <ciso646>
+// REQUIRES: objective-c++
 
-#include <ciso646>
+// Make sure the test passes if it succeeds to link.
 
-#include "test_macros.h"
+@interface I;
+@end
 
-int main(int, char**)
-{
-
-  return 0;
-}
+int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/run-error.link.pass.mm
similarity index 70%
copy from third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
copy to third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/run-error.link.pass.mm
index 1efeba1..778fab3 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/link.pass.mm/run-error.link.pass.mm
@@ -6,10 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03
+// REQUIRES: objective-c++
 
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
+// Make sure the test passes if it succeeds to link, even though it would have
+// failed at runtime.
+
+@interface I;
+@end
+
 int main(int, char**) {
-  return 0;
+    return 1;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/selftest/verify.cpp/no-werror.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/selftest/verify.cpp/no-werror.verify.cpp
index b1234ae..e96d6be 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/selftest/verify.cpp/no-werror.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/selftest/verify.cpp/no-werror.verify.cpp
@@ -10,7 +10,6 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -Wunused-variable
 
-int main(int, char**) {
+void f() {
     int foo; // expected-warning {{unused variable}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
index d679e7a..504b8c8 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
@@ -18,7 +18,7 @@
 
 template <class T>
 class small_pointer {
-  uint16_t offset;
+  std::uint16_t offset;
 };
 
 template <class T>
@@ -26,8 +26,8 @@
 public:
   using value_type = T;
   using pointer = small_pointer<T>;
-  using size_type = int16_t;
-  using difference_type = int16_t;
+  using size_type = std::int16_t;
+  using difference_type = std::int16_t;
 
   small_iter_allocator() TEST_NOEXCEPT {}
 
@@ -132,5 +132,5 @@
 #  endif
 
 #else
-#  error "size_t has an unexpected size"
+#  error "std::size_t has an unexpected size"
 #endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
index 9024d11..4d3eeb1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
@@ -16,7 +16,7 @@
 
 template <class T>
 class small_pointer {
-  uint16_t offset;
+  std::uint16_t offset;
 };
 
 template <class T>
@@ -24,8 +24,8 @@
 public:
   using value_type = T;
   using pointer = small_pointer<T>;
-  using size_type = int16_t;
-  using difference_type = int16_t;
+  using size_type = std::int16_t;
+  using difference_type = std::int16_t;
 
   small_iter_allocator() TEST_NOEXCEPT {}
 
@@ -131,5 +131,5 @@
 #  endif
 
 #else
-#  error "size_t has an unexpected size"
+#  error "std::size_t has an unexpected size"
 #endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
index f2d961e..522f606 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
index b2f0475..94a4351 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
index 3de1b84..5dd987b 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
index 74d0e4f..9f583fc 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
index d2d9134..c7c8c8d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
index 218ab0e..9a3e6b2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
index 5592959..feb9499 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
@@ -22,8 +22,7 @@
 // Reported as https://llvm.org/PR53170.
 
 // reserve(n) used to shrink the string until https://llvm.org/D117332 was shipped.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 #include <string>
 #include <stdexcept>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/max_size.pass.cpp
index 69b45f8..4bc622f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.capacity/max_size.pass.cpp
@@ -18,48 +18,48 @@
 #include "test_macros.h"
 
 // alignment of the string heap buffer is hardcoded to 16
-static const size_t alignment = 16;
+static const std::size_t alignment = 16;
 
 template <class = int>
 TEST_CONSTEXPR_CXX20 void full_size() {
   std::string str;
-  assert(str.max_size() == std::numeric_limits<size_t>::max() - alignment);
+  assert(str.max_size() == std::numeric_limits<std::size_t>::max() - alignment);
 
 #ifndef TEST_HAS_NO_CHAR8_T
   std::u8string u8str;
-  assert(u8str.max_size() == std::numeric_limits<size_t>::max() - alignment);
+  assert(u8str.max_size() == std::numeric_limits<std::size_t>::max() - alignment);
 #endif
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   std::wstring wstr;
-  assert(wstr.max_size() == std::numeric_limits<size_t>::max() / sizeof(wchar_t) - alignment);
+  assert(wstr.max_size() == std::numeric_limits<std::size_t>::max() / sizeof(wchar_t) - alignment);
 #endif
 
   std::u16string u16str;
   std::u32string u32str;
-  assert(u16str.max_size() == std::numeric_limits<size_t>::max() / 2 - alignment);
-  assert(u32str.max_size() == std::numeric_limits<size_t>::max() / 4 - alignment);
+  assert(u16str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment);
+  assert(u32str.max_size() == std::numeric_limits<std::size_t>::max() / 4 - alignment);
 }
 
 template <class = int>
 TEST_CONSTEXPR_CXX20 void half_size() {
   std::string str;
-  assert(str.max_size() == std::numeric_limits<size_t>::max() / 2 - alignment);
+  assert(str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment);
 
 #ifndef TEST_HAS_NO_CHAR8_T
   std::u8string u8str;
-  assert(u8str.max_size() == std::numeric_limits<size_t>::max() / 2 - alignment);
+  assert(u8str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment);
 #endif
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   std::wstring wstr;
-  assert(wstr.max_size() == std::numeric_limits<size_t>::max() / std::max<size_t>(2ul, sizeof(wchar_t)) - alignment);
+  assert(wstr.max_size() == std::numeric_limits<std::size_t>::max() / std::max<size_t>(2ul, sizeof(wchar_t)) - alignment);
 #endif
 
   std::u16string u16str;
   std::u32string u32str;
-  assert(u16str.max_size() == std::numeric_limits<size_t>::max() / 2 - alignment);
-  assert(u32str.max_size() == std::numeric_limits<size_t>::max() / 4 - alignment);
+  assert(u16str.max_size() == std::numeric_limits<std::size_t>::max() / 2 - alignment);
+  assert(u32str.max_size() == std::numeric_limits<std::size_t>::max() / 4 - alignment);
 }
 
 TEST_CONSTEXPR_CXX20 bool test() {
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
index 13a2301..2a120fb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 int main(int, char**) {
-  using T = decltype(uint8_t() - uint8_t());
+  using T = decltype(std::uint8_t() - std::uint8_t());
   {
     typedef std::string C;
     C c(1, '\0');
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
index f22caff..582986c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
index 286e348..8fb734c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/constexpr.cstring.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/constexpr.cstring.compile.pass.cpp
index ad078c0..f440810 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/constexpr.cstring.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/constexpr.cstring.compile.pass.cpp
@@ -8,9 +8,11 @@
 
 // UNSUPPORTED: c++03, c++11
 
+// ADDITIONAL_COMPILE_FLAGS: -Wno-private-header
+
 // Check that __constexpr_* cstring functions are actually constexpr
 
-#include <cstring>
+#include <__string/constexpr_c_functions.h>
 
 static_assert(std::__constexpr_strlen("Banane") == 6, "");
 static_assert(std::__constexpr_memcmp("Banane", "Banand", 6) == 1, "");
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/version_cuchar.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
index 2c62af8..1eeaec1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
@@ -8,9 +8,6 @@
 
 // UNSUPPORTED: c++03
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // <cuchar>
 
 #include <cuchar>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.length.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.length.pass.cpp
new file mode 100644
index 0000000..7d7ea07
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.length.pass.cpp
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: has-unix-headers
+
+// UNSUPPORTED: c++03, c++11
+// XFAIL: availability-verbose_abort-missing
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
+
+// Construct a string_view from an invalid length
+// constexpr basic_string_view( const _CharT* s, size_type len )
+
+#include <string_view>
+
+#include "check_assertion.h"
+
+int main(int, char**) {
+  char c = 0;
+  TEST_LIBCPP_ASSERT_FAILURE(
+      std::string_view(&c, -1), "string_view::string_view(_CharT *, size_t): length does not fit in difference_type");
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
index f674cfa..16acfd6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
@@ -10,7 +10,7 @@
 // UNSUPPORTED: c++11, c++14
 
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // Construct a string_view from a null pointer
diff --git a/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/string.view.iterators/debug.iterator-indexing.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/string.view.iterators/debug.iterator-indexing.pass.cpp
new file mode 100644
index 0000000..f6b16eb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/strings/string.view/string.view.iterators/debug.iterator-indexing.pass.cpp
@@ -0,0 +1,88 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Make sure that std::string_view's iterators check for OOB accesses when the debug mode is enabled.
+
+// REQUIRES: has-unix-headers
+// UNSUPPORTED: !libcpp-has-debug-mode
+
+#include <string_view>
+
+#include "check_assertion.h"
+
+int main(int, char**) {
+    // string_view::iterator
+    {
+        std::string_view const str("hello world");
+        {
+            auto it = str.end();
+            TEST_LIBCPP_ASSERT_FAILURE(*it, "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.end();
+            TEST_LIBCPP_ASSERT_FAILURE(it.operator->(), "__bounded_iter::operator->: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.begin();
+            TEST_LIBCPP_ASSERT_FAILURE(it[99], "__bounded_iter::operator[]: Attempt to index an iterator out-of-range");
+        }
+    }
+
+    // string_view::const_iterator
+    {
+        std::string_view const str("hello world");
+        {
+            auto it = str.cend();
+            TEST_LIBCPP_ASSERT_FAILURE(*it, "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.cend();
+            TEST_LIBCPP_ASSERT_FAILURE(it.operator->(), "__bounded_iter::operator->: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.cbegin();
+            TEST_LIBCPP_ASSERT_FAILURE(it[99], "__bounded_iter::operator[]: Attempt to index an iterator out-of-range");
+        }
+    }
+
+    // string_view::reverse_iterator
+    {
+        std::string_view const str("hello world");
+        {
+            auto it = str.rend();
+            TEST_LIBCPP_ASSERT_FAILURE(*it, "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.rend();
+            TEST_LIBCPP_ASSERT_FAILURE(it.operator->(), "__bounded_iter::operator->: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.rbegin();
+            TEST_LIBCPP_ASSERT_FAILURE(it[99], "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+    }
+
+    // string_view::const_reverse_iterator
+    {
+        std::string_view const str("hello world");
+        {
+            auto it = str.crend();
+            TEST_LIBCPP_ASSERT_FAILURE(*it, "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.crend();
+            TEST_LIBCPP_ASSERT_FAILURE(it.operator->(), "__bounded_iter::operator->: Attempt to dereference an out-of-range iterator");
+        }
+        {
+            auto it = str.crbegin();
+            TEST_LIBCPP_ASSERT_FAILURE(it[99], "__bounded_iter::operator*: Attempt to dereference an out-of-range iterator");
+        }
+    }
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/atomic.availability.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
index e96d461..419be93 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
@@ -7,17 +7,14 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on the C++20 Synchronization Library
 // additions to <atomic>.
 
 #include <atomic>
 
-
-int main(int, char**)
-{
+void f() {
     {
         std::atomic<int> i(3);
         std::memory_order m = std::memory_order_relaxed;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/barrier.availability.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
index 8da39fe..c9baa8b 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::barrier.
 
@@ -19,8 +18,7 @@
     void operator()() { }
 };
 
-int main(int, char**)
-{
+void f() {
     // Availability markup on std::barrier<>
     {
         std::barrier<> b(10); // expected-error {{is unavailable}}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
index c4090ed..f9a97d5 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, no-threads
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <future>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
index a4c21ec..de39734 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, no-threads
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <future>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/latch.availability.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/latch.availability.verify.cpp
index 8555e0e..3aa50ea 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/latch.availability.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/latch.availability.verify.cpp
@@ -7,16 +7,13 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::latch.
 
 #include <latch>
 
-
-int main(int, char**)
-{
+void f() {
     std::latch latch(10);
     latch.count_down(); // expected-error {{is unavailable}}
     latch.count_down(3); // expected-error {{is unavailable}}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
index a6d5c36..29a6a60 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
@@ -7,17 +7,14 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::counting_semaphore and std::binary_semaphore.
 
 #include <chrono>
 #include <semaphore>
 
-
-int main(int, char**)
-{
+void f() {
     {
         // Tests for std::counting_semaphore with non-default template argument
         std::counting_semaphore<20> sem(10);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.barrier/version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.barrier/version.compile.pass.cpp
index 7890787..fb80bb0 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.barrier/version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.barrier/version.compile.pass.cpp
@@ -18,8 +18,3 @@
 #ifndef _LIBCPP_VERSION
 #error _LIBCPP_VERSION not defined
 #endif
-
-int main(int, char**)
-{
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
index 0d682cd..fd863fb 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
@@ -14,7 +14,7 @@
 // UNSUPPORTED: c++03
 
 // PR30202 was fixed starting in macosx10.13.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // <condition_variable>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
index 374aa2f..13d1bfc 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
@@ -17,8 +17,10 @@
 // typedef pthread_cond_t* native_handle_type;
 // native_handle_type native_handle();
 
-#include <condition_variable>
 #include <cassert>
+#include <condition_variable>
+#include <pthread.h>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.latch/version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.latch/version.compile.pass.cpp
index 365ee92..559c827 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.latch/version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.latch/version.compile.pass.cpp
@@ -18,8 +18,3 @@
 #ifndef _LIBCPP_VERSION
 #error _LIBCPP_VERSION not defined
 #endif
-
-int main(int, char**)
-{
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
index c0cad32..5fe68c8 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
@@ -23,9 +23,8 @@
 
 #include <mutex>
 
-int main(int, char**) {
+void f() {
     std::mutex m;
     std::lock_guard<std::mutex>{m}; // expected-warning {{ignoring temporary created by a constructor declared with 'nodiscard' attribute}}
     std::lock_guard<std::mutex>{m, std::adopt_lock}; // expected-warning {{ignoring temporary created by a constructor declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
index 02072f5..5d40fa7 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.semaphore/version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.semaphore/version.compile.pass.cpp
index 3f59448..9eaf1ad 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.semaphore/version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.semaphore/version.compile.pass.cpp
@@ -18,8 +18,3 @@
 #ifndef _LIBCPP_VERSION
 #error _LIBCPP_VERSION not defined
 #endif
-
-int main(int, char**)
-{
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
index 59bcec4..9031359 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
@@ -11,7 +11,7 @@
 // Until 58a0a70fb2f1, this_thread::sleep_for could sometimes get interrupted
 // by signals and this test would fail spuriously. Disable the test on the
 // corresponding system libraries.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // ALLOW_RETRIES: 3
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.signals.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.signals.pass.cpp
index 5e5005c..ad62e0c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.signals.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.signals.pass.cpp
@@ -14,7 +14,7 @@
 // Until 58a0a70fb2f1, this_thread::sleep_for misbehaves when interrupted by
 // a signal, as tested here. Disable the test on the corresponding system
 // libraries.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // ALLOW_RETRIES: 3
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/time/convert_to_tm.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/time/convert_to_tm.pass.cpp
new file mode 100644
index 0000000..9e52b5b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/time/convert_to_tm.pass.cpp
@@ -0,0 +1,62 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// <chrono>
+
+// template <class _Tm, class _ChronoT>
+// _LIBCPP_HIDE_FROM_ABI _Tm __convert_to_tm(const _ChronoT& __value)
+
+// Most of the code is tested indirectly in the chrono formatters. This only
+// tests the hour overflow.
+
+#include <chrono>
+#include <cassert>
+#include <format>
+#include <string_view>
+
+#include "test_macros.h"
+
+// libc++ uses a long as representation in std::chrono::hours.
+// std::tm uses an int for its integral members. The overflow in the hour
+// conversion can only occur on platforms where sizeof(long) > sizeof(int).
+// Instead emulate this error by using a "tm" with shorts.
+// (The function is already templated to this is quite easy to do,)
+struct minimal_short_tm {
+  short tm_sec;
+  short tm_min;
+  short tm_hour;
+  const char* tm_zone;
+};
+
+int main(int, char**) {
+  { // Test with the maximum number of hours that fit in a short.
+    std::chrono::hh_mm_ss time{std::chrono::hours{32767}};
+    minimal_short_tm result = std::__convert_to_tm<minimal_short_tm>(time);
+    assert(result.tm_sec == 0);
+    assert(result.tm_min == 0);
+    assert(result.tm_hour == 32767);
+  }
+
+#ifndef TEST_HAS_NO_EXCEPTIONS
+  { // Test above the maximum number of hours that fit in a short.
+    std::chrono::hh_mm_ss time{std::chrono::hours{32768}};
+    try {
+      TEST_IGNORE_NODISCARD std::__convert_to_tm<minimal_short_tm>(time);
+      assert(false);
+    } catch ([[maybe_unused]] const std::format_error& e) {
+      LIBCPP_ASSERT(e.what() == std::string_view("Formatting hh_mm_ss, encountered an hour overflow"));
+      return 0;
+    }
+    assert(false);
+  }
+#endif // TEST_HAS_NO_EXCEPTIONS
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes.sh.cpp
index 5eaca97..28a1ed5 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes.sh.cpp
@@ -27,9 +27,6 @@
 // This test uses --trace-includes, which is not supported by GCC.
 // UNSUPPORTED: gcc
 
-// This test doesn't work on AIX, but it should. Needs investigation.
-// XFAIL: buildhost=aix
-
 // This test is not supported when we remove the transitive includes provided for backwards
 // compatibility. When we bulk-remove them, we'll adjust the includes that are expected by
 // this test instead.
@@ -60,7 +57,7 @@
     continue
 
   normalized_header = re.sub('/', '_', header)
-  print(f"// {RUN}: %{{cxx}} %s %{{flags}} %{{compile_flags}} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_{i} 2> %t/header.{normalized_header}")
+  print(f"// {RUN}: %{{cxx}} %s %{{flags}} %{{compile_flags}} --trace-includes -fshow-skipped-includes --preprocess -DTEST_{i} 2> %t/header.{normalized_header}")
   print(f"#if defined(TEST_{i})")
   print(f"#include <{header}>")
   print("#endif")
@@ -77,492 +74,480 @@
 // DO NOT MANUALLY EDIT ANYTHING BETWEEN THE MARKERS BELOW
 // GENERATED-MARKER
 // RUN: mkdir %t
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_0 2> %t/header.algorithm
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_0 2> %t/header.algorithm
 #if defined(TEST_0)
 #include <algorithm>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_1 2> %t/header.any
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_1 2> %t/header.any
 #if defined(TEST_1)
 #include <any>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_2 2> %t/header.array
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_2 2> %t/header.array
 #if defined(TEST_2)
 #include <array>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_3 2> %t/header.atomic
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_3 2> %t/header.atomic
 #if defined(TEST_3)
 #include <atomic>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_4 2> %t/header.barrier
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_4 2> %t/header.barrier
 #if defined(TEST_4)
 #include <barrier>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_5 2> %t/header.bit
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_5 2> %t/header.bit
 #if defined(TEST_5)
 #include <bit>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_6 2> %t/header.bitset
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_6 2> %t/header.bitset
 #if defined(TEST_6)
 #include <bitset>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_7 2> %t/header.cassert
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_7 2> %t/header.cassert
 #if defined(TEST_7)
 #include <cassert>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_8 2> %t/header.ccomplex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_8 2> %t/header.ccomplex
 #if defined(TEST_8)
 #include <ccomplex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_9 2> %t/header.cctype
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_9 2> %t/header.cctype
 #if defined(TEST_9)
 #include <cctype>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_10 2> %t/header.cerrno
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_10 2> %t/header.cerrno
 #if defined(TEST_10)
 #include <cerrno>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_11 2> %t/header.cfenv
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_11 2> %t/header.cfenv
 #if defined(TEST_11)
 #include <cfenv>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_12 2> %t/header.cfloat
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_12 2> %t/header.cfloat
 #if defined(TEST_12)
 #include <cfloat>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_13 2> %t/header.charconv
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_13 2> %t/header.charconv
 #if defined(TEST_13)
 #include <charconv>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_14 2> %t/header.chrono
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_14 2> %t/header.chrono
 #if defined(TEST_14)
 #include <chrono>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_15 2> %t/header.cinttypes
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_15 2> %t/header.cinttypes
 #if defined(TEST_15)
 #include <cinttypes>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_16 2> %t/header.ciso646
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_16 2> %t/header.ciso646
 #if defined(TEST_16)
 #include <ciso646>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_17 2> %t/header.climits
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_17 2> %t/header.climits
 #if defined(TEST_17)
 #include <climits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_18 2> %t/header.clocale
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_18 2> %t/header.clocale
 #if defined(TEST_18)
 #include <clocale>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_19 2> %t/header.cmath
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_19 2> %t/header.cmath
 #if defined(TEST_19)
 #include <cmath>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_20 2> %t/header.codecvt
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_20 2> %t/header.codecvt
 #if defined(TEST_20)
 #include <codecvt>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_21 2> %t/header.compare
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_21 2> %t/header.compare
 #if defined(TEST_21)
 #include <compare>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_22 2> %t/header.complex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_22 2> %t/header.complex
 #if defined(TEST_22)
 #include <complex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_24 2> %t/header.concepts
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_24 2> %t/header.concepts
 #if defined(TEST_24)
 #include <concepts>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_25 2> %t/header.condition_variable
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_25 2> %t/header.condition_variable
 #if defined(TEST_25)
 #include <condition_variable>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_26 2> %t/header.coroutine
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_26 2> %t/header.coroutine
 #if defined(TEST_26)
 #include <coroutine>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_27 2> %t/header.csetjmp
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_27 2> %t/header.csetjmp
 #if defined(TEST_27)
 #include <csetjmp>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_28 2> %t/header.csignal
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_28 2> %t/header.csignal
 #if defined(TEST_28)
 #include <csignal>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_29 2> %t/header.cstdarg
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_29 2> %t/header.cstdarg
 #if defined(TEST_29)
 #include <cstdarg>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_30 2> %t/header.cstdbool
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_30 2> %t/header.cstdbool
 #if defined(TEST_30)
 #include <cstdbool>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_31 2> %t/header.cstddef
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_31 2> %t/header.cstddef
 #if defined(TEST_31)
 #include <cstddef>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_32 2> %t/header.cstdint
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_32 2> %t/header.cstdint
 #if defined(TEST_32)
 #include <cstdint>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_33 2> %t/header.cstdio
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_33 2> %t/header.cstdio
 #if defined(TEST_33)
 #include <cstdio>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_34 2> %t/header.cstdlib
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_34 2> %t/header.cstdlib
 #if defined(TEST_34)
 #include <cstdlib>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_35 2> %t/header.cstring
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_35 2> %t/header.cstring
 #if defined(TEST_35)
 #include <cstring>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_36 2> %t/header.ctgmath
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_36 2> %t/header.ctgmath
 #if defined(TEST_36)
 #include <ctgmath>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_37 2> %t/header.ctime
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_37 2> %t/header.ctime
 #if defined(TEST_37)
 #include <ctime>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_39 2> %t/header.cuchar
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_39 2> %t/header.cuchar
 #if defined(TEST_39)
 #include <cuchar>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_40 2> %t/header.cwchar
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_40 2> %t/header.cwchar
 #if defined(TEST_40)
 #include <cwchar>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_41 2> %t/header.cwctype
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_41 2> %t/header.cwctype
 #if defined(TEST_41)
 #include <cwctype>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_42 2> %t/header.deque
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_42 2> %t/header.deque
 #if defined(TEST_42)
 #include <deque>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_44 2> %t/header.exception
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_44 2> %t/header.exception
 #if defined(TEST_44)
 #include <exception>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_45 2> %t/header.execution
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_45 2> %t/header.execution
 #if defined(TEST_45)
 #include <execution>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_46 2> %t/header.expected
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_46 2> %t/header.expected
 #if defined(TEST_46)
 #include <expected>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_48 2> %t/header.filesystem
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_48 2> %t/header.filesystem
 #if defined(TEST_48)
 #include <filesystem>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_50 2> %t/header.format
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_50 2> %t/header.format
 #if defined(TEST_50)
 #include <format>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_51 2> %t/header.forward_list
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_51 2> %t/header.forward_list
 #if defined(TEST_51)
 #include <forward_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_52 2> %t/header.fstream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_52 2> %t/header.fstream
 #if defined(TEST_52)
 #include <fstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_53 2> %t/header.functional
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_53 2> %t/header.functional
 #if defined(TEST_53)
 #include <functional>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_54 2> %t/header.future
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_54 2> %t/header.future
 #if defined(TEST_54)
 #include <future>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_55 2> %t/header.initializer_list
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_55 2> %t/header.initializer_list
 #if defined(TEST_55)
 #include <initializer_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_57 2> %t/header.iomanip
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_57 2> %t/header.iomanip
 #if defined(TEST_57)
 #include <iomanip>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_58 2> %t/header.ios
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_58 2> %t/header.ios
 #if defined(TEST_58)
 #include <ios>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_59 2> %t/header.iosfwd
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_59 2> %t/header.iosfwd
 #if defined(TEST_59)
 #include <iosfwd>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_60 2> %t/header.iostream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_60 2> %t/header.iostream
 #if defined(TEST_60)
 #include <iostream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_61 2> %t/header.istream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_61 2> %t/header.istream
 #if defined(TEST_61)
 #include <istream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_62 2> %t/header.iterator
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_62 2> %t/header.iterator
 #if defined(TEST_62)
 #include <iterator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_63 2> %t/header.latch
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_63 2> %t/header.latch
 #if defined(TEST_63)
 #include <latch>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_64 2> %t/header.limits
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_64 2> %t/header.limits
 #if defined(TEST_64)
 #include <limits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_66 2> %t/header.list
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_66 2> %t/header.list
 #if defined(TEST_66)
 #include <list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_67 2> %t/header.locale
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_67 2> %t/header.locale
 #if defined(TEST_67)
 #include <locale>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_69 2> %t/header.map
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_69 2> %t/header.map
 #if defined(TEST_69)
 #include <map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_71 2> %t/header.memory
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_71 2> %t/header.memory
 #if defined(TEST_71)
 #include <memory>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_72 2> %t/header.memory_resource
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_72 2> %t/header.memory_resource
 #if defined(TEST_72)
 #include <memory_resource>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_73 2> %t/header.mutex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_73 2> %t/header.mutex
 #if defined(TEST_73)
 #include <mutex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_74 2> %t/header.new
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_74 2> %t/header.new
 #if defined(TEST_74)
 #include <new>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_75 2> %t/header.numbers
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_75 2> %t/header.numbers
 #if defined(TEST_75)
 #include <numbers>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_76 2> %t/header.numeric
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_76 2> %t/header.numeric
 #if defined(TEST_76)
 #include <numeric>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_77 2> %t/header.optional
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_77 2> %t/header.optional
 #if defined(TEST_77)
 #include <optional>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_78 2> %t/header.ostream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_78 2> %t/header.ostream
 #if defined(TEST_78)
 #include <ostream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_79 2> %t/header.queue
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_79 2> %t/header.queue
 #if defined(TEST_79)
 #include <queue>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_80 2> %t/header.random
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_80 2> %t/header.random
 #if defined(TEST_80)
 #include <random>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_81 2> %t/header.ranges
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_81 2> %t/header.ranges
 #if defined(TEST_81)
 #include <ranges>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_82 2> %t/header.ratio
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_82 2> %t/header.ratio
 #if defined(TEST_82)
 #include <ratio>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_83 2> %t/header.regex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_83 2> %t/header.regex
 #if defined(TEST_83)
 #include <regex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_84 2> %t/header.scoped_allocator
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_84 2> %t/header.scoped_allocator
 #if defined(TEST_84)
 #include <scoped_allocator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_85 2> %t/header.semaphore
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_85 2> %t/header.semaphore
 #if defined(TEST_85)
 #include <semaphore>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_86 2> %t/header.set
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_86 2> %t/header.set
 #if defined(TEST_86)
 #include <set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_88 2> %t/header.shared_mutex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_88 2> %t/header.shared_mutex
 #if defined(TEST_88)
 #include <shared_mutex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_89 2> %t/header.source_location
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_89 2> %t/header.source_location
 #if defined(TEST_89)
 #include <source_location>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_90 2> %t/header.span
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_90 2> %t/header.span
 #if defined(TEST_90)
 #include <span>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_91 2> %t/header.sstream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_91 2> %t/header.sstream
 #if defined(TEST_91)
 #include <sstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_92 2> %t/header.stack
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_92 2> %t/header.stack
 #if defined(TEST_92)
 #include <stack>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_96 2> %t/header.stdexcept
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_96 2> %t/header.stdexcept
 #if defined(TEST_96)
 #include <stdexcept>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_100 2> %t/header.streambuf
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_100 2> %t/header.streambuf
 #if defined(TEST_100)
 #include <streambuf>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_101 2> %t/header.string
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_101 2> %t/header.string
 #if defined(TEST_101)
 #include <string>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_103 2> %t/header.string_view
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_103 2> %t/header.string_view
 #if defined(TEST_103)
 #include <string_view>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_104 2> %t/header.strstream
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_104 2> %t/header.strstream
 #if defined(TEST_104)
 #include <strstream>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_105 2> %t/header.system_error
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_105 2> %t/header.system_error
 #if defined(TEST_105)
 #include <system_error>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_107 2> %t/header.thread
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_107 2> %t/header.thread
 #if defined(TEST_107)
 #include <thread>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_108 2> %t/header.tuple
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_108 2> %t/header.tuple
 #if defined(TEST_108)
 #include <tuple>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_109 2> %t/header.type_traits
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_109 2> %t/header.type_traits
 #if defined(TEST_109)
 #include <type_traits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_110 2> %t/header.typeindex
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_110 2> %t/header.typeindex
 #if defined(TEST_110)
 #include <typeindex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_111 2> %t/header.typeinfo
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_111 2> %t/header.typeinfo
 #if defined(TEST_111)
 #include <typeinfo>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_113 2> %t/header.unordered_map
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_113 2> %t/header.unordered_map
 #if defined(TEST_113)
 #include <unordered_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_114 2> %t/header.unordered_set
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_114 2> %t/header.unordered_set
 #if defined(TEST_114)
 #include <unordered_set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_115 2> %t/header.utility
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_115 2> %t/header.utility
 #if defined(TEST_115)
 #include <utility>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_116 2> %t/header.valarray
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_116 2> %t/header.valarray
 #if defined(TEST_116)
 #include <valarray>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_117 2> %t/header.variant
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_117 2> %t/header.variant
 #if defined(TEST_117)
 #include <variant>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_118 2> %t/header.vector
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_118 2> %t/header.vector
 #if defined(TEST_118)
 #include <vector>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_119 2> %t/header.version
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_119 2> %t/header.version
 #if defined(TEST_119)
 #include <version>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_122 2> %t/header.experimental_algorithm
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_122 2> %t/header.experimental_deque
 #if defined(TEST_122)
-#include <experimental/algorithm>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_123 2> %t/header.experimental_coroutine
-#if defined(TEST_123)
-#include <experimental/coroutine>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_124 2> %t/header.experimental_deque
-#if defined(TEST_124)
 #include <experimental/deque>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_125 2> %t/header.experimental_forward_list
-#if defined(TEST_125)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_123 2> %t/header.experimental_forward_list
+#if defined(TEST_123)
 #include <experimental/forward_list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_126 2> %t/header.experimental_functional
-#if defined(TEST_126)
-#include <experimental/functional>
-#endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_127 2> %t/header.experimental_iterator
-#if defined(TEST_127)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_124 2> %t/header.experimental_iterator
+#if defined(TEST_124)
 #include <experimental/iterator>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_128 2> %t/header.experimental_list
-#if defined(TEST_128)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_125 2> %t/header.experimental_list
+#if defined(TEST_125)
 #include <experimental/list>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_129 2> %t/header.experimental_map
-#if defined(TEST_129)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_126 2> %t/header.experimental_map
+#if defined(TEST_126)
 #include <experimental/map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_130 2> %t/header.experimental_memory_resource
-#if defined(TEST_130)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_127 2> %t/header.experimental_memory_resource
+#if defined(TEST_127)
 #include <experimental/memory_resource>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_131 2> %t/header.experimental_propagate_const
-#if defined(TEST_131)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_128 2> %t/header.experimental_propagate_const
+#if defined(TEST_128)
 #include <experimental/propagate_const>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_132 2> %t/header.experimental_regex
-#if defined(TEST_132)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_129 2> %t/header.experimental_regex
+#if defined(TEST_129)
 #include <experimental/regex>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_133 2> %t/header.experimental_set
-#if defined(TEST_133)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_130 2> %t/header.experimental_set
+#if defined(TEST_130)
 #include <experimental/set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_134 2> %t/header.experimental_simd
-#if defined(TEST_134)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_131 2> %t/header.experimental_simd
+#if defined(TEST_131)
 #include <experimental/simd>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_135 2> %t/header.experimental_string
-#if defined(TEST_135)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_132 2> %t/header.experimental_string
+#if defined(TEST_132)
 #include <experimental/string>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_136 2> %t/header.experimental_type_traits
-#if defined(TEST_136)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_133 2> %t/header.experimental_type_traits
+#if defined(TEST_133)
 #include <experimental/type_traits>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_137 2> %t/header.experimental_unordered_map
-#if defined(TEST_137)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_134 2> %t/header.experimental_unordered_map
+#if defined(TEST_134)
 #include <experimental/unordered_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_138 2> %t/header.experimental_unordered_set
-#if defined(TEST_138)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_135 2> %t/header.experimental_unordered_set
+#if defined(TEST_135)
 #include <experimental/unordered_set>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_139 2> %t/header.experimental_utility
-#if defined(TEST_139)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_136 2> %t/header.experimental_utility
+#if defined(TEST_136)
 #include <experimental/utility>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_140 2> %t/header.experimental_vector
-#if defined(TEST_140)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_137 2> %t/header.experimental_vector
+#if defined(TEST_137)
 #include <experimental/vector>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_141 2> %t/header.ext_hash_map
-#if defined(TEST_141)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_138 2> %t/header.ext_hash_map
+#if defined(TEST_138)
 #include <ext/hash_map>
 #endif
-// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes -fsyntax-only -DTEST_142 2> %t/header.ext_hash_set
-#if defined(TEST_142)
+// RUN: %{cxx} %s %{flags} %{compile_flags} --trace-includes -fshow-skipped-includes --preprocess -DTEST_139 2> %t/header.ext_hash_set
+#if defined(TEST_139)
 #include <ext/hash_set>
 #endif
 // RUN: %{python} %S/transitive_includes_to_csv.py %t > %t/transitive_includes.csv
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx03.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx03.csv
index 58fe49c..782e3f8 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx03.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx03.csv
@@ -51,6 +51,7 @@
 atomic compare
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
@@ -73,6 +74,7 @@
 barrier stdexcept
 barrier type_traits
 barrier variant
+barrier version
 bit cstdint
 bit cstdlib
 bit iosfwd
@@ -105,11 +107,13 @@
 charconv iosfwd
 charconv limits
 charconv type_traits
+chrono bit
 chrono compare
 chrono concepts
 chrono cstddef
 chrono cstdint
 chrono cstdlib
+chrono cstring
 chrono ctime
 chrono limits
 chrono ratio
@@ -154,17 +158,20 @@
 concepts type_traits
 concepts version
 condition_variable atomic
+condition_variable cerrno
 condition_variable concepts
 condition_variable cstddef
 condition_variable cstdint
 condition_variable cstdlib
 condition_variable cstring
+condition_variable ctime
 condition_variable initializer_list
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
+condition_variable string
 condition_variable system_error
 condition_variable type_traits
 condition_variable typeinfo
@@ -207,46 +214,13 @@
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine atomic
-experimental/coroutine climits
-experimental/coroutine cmath
-experimental/coroutine compare
-experimental/coroutine concepts
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine ctime
-experimental/coroutine initializer_list
-experimental/coroutine iosfwd
-experimental/coroutine iterator
-experimental/coroutine limits
-experimental/coroutine memory
-experimental/coroutine new
-experimental/coroutine ratio
-experimental/coroutine stdexcept
-experimental/coroutine tuple
-experimental/coroutine type_traits
-experimental/coroutine typeinfo
-experimental/coroutine utility
-experimental/coroutine variant
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -325,7 +299,6 @@
 ext/hash_set new
 ext/hash_set string
 ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem concepts
 filesystem cstddef
@@ -344,12 +317,10 @@
 filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -360,7 +331,6 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list algorithm
@@ -424,16 +394,26 @@
 functional utility
 functional vector
 functional version
+future atomic
+future cerrno
 future chrono
 future cstddef
+future cstdint
+future cstdlib
+future cstring
 future exception
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
+future stdexcept
+future string
 future system_error
 future thread
 future type_traits
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
@@ -483,7 +463,14 @@
 iterator variant
 iterator version
 latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
+latch type_traits
 latch version
 limits type_traits
 limits version
@@ -508,6 +495,7 @@
 list version
 locale atomic
 locale cctype
+locale cerrno
 locale concepts
 locale cstdarg
 locale cstddef
@@ -571,11 +559,13 @@
 memory_resource tuple
 memory_resource version
 mutex atomic
+mutex cerrno
 mutex concepts
 mutex cstddef
 mutex cstdint
 mutex cstdlib
 mutex cstring
+mutex ctime
 mutex functional
 mutex initializer_list
 mutex iosfwd
@@ -583,6 +573,7 @@
 mutex new
 mutex ratio
 mutex stdexcept
+mutex string
 mutex system_error
 mutex type_traits
 mutex typeinfo
@@ -626,6 +617,7 @@
 optional version
 ostream atomic
 ostream bitset
+ostream cerrno
 ostream concepts
 ostream cstddef
 ostream cstdint
@@ -640,6 +632,7 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream type_traits
 ostream typeinfo
 ostream version
@@ -726,6 +719,8 @@
 scoped_allocator version
 semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -746,6 +741,16 @@
 set tuple
 set type_traits
 set version
+shared_mutex cerrno
+shared_mutex cstddef
+shared_mutex ctime
+shared_mutex iosfwd
+shared_mutex limits
+shared_mutex ratio
+shared_mutex stdexcept
+shared_mutex string
+shared_mutex system_error
+shared_mutex type_traits
 shared_mutex version
 source_location cstdint
 source_location version
@@ -833,6 +838,8 @@
 system_error string
 system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread chrono
 thread compare
 thread cstddef
@@ -842,11 +849,16 @@
 thread functional
 thread iosfwd
 thread limits
+thread locale
 thread new
 thread ratio
+thread stdexcept
+thread string
+thread string_view
 thread system_error
 thread tuple
 thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx11.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx11.csv
index 2f9ef7d..e54fe47 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx11.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx11.csv
@@ -51,6 +51,7 @@
 atomic compare
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
@@ -73,6 +74,7 @@
 barrier stdexcept
 barrier type_traits
 barrier variant
+barrier version
 bit cstdint
 bit cstdlib
 bit iosfwd
@@ -105,11 +107,13 @@
 charconv iosfwd
 charconv limits
 charconv type_traits
+chrono bit
 chrono compare
 chrono concepts
 chrono cstddef
 chrono cstdint
 chrono cstdlib
+chrono cstring
 chrono ctime
 chrono limits
 chrono ratio
@@ -154,17 +158,20 @@
 concepts type_traits
 concepts version
 condition_variable atomic
+condition_variable cerrno
 condition_variable concepts
 condition_variable cstddef
 condition_variable cstdint
 condition_variable cstdlib
 condition_variable cstring
+condition_variable ctime
 condition_variable initializer_list
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
+condition_variable string
 condition_variable system_error
 condition_variable type_traits
 condition_variable typeinfo
@@ -207,46 +214,13 @@
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine atomic
-experimental/coroutine climits
-experimental/coroutine cmath
-experimental/coroutine compare
-experimental/coroutine concepts
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine ctime
-experimental/coroutine initializer_list
-experimental/coroutine iosfwd
-experimental/coroutine iterator
-experimental/coroutine limits
-experimental/coroutine memory
-experimental/coroutine new
-experimental/coroutine ratio
-experimental/coroutine stdexcept
-experimental/coroutine tuple
-experimental/coroutine type_traits
-experimental/coroutine typeinfo
-experimental/coroutine utility
-experimental/coroutine variant
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -325,7 +299,6 @@
 ext/hash_set new
 ext/hash_set string
 ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem concepts
 filesystem cstddef
@@ -344,12 +317,10 @@
 filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -360,7 +331,6 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list algorithm
@@ -424,16 +394,26 @@
 functional utility
 functional vector
 functional version
+future atomic
+future cerrno
 future chrono
 future cstddef
+future cstdint
+future cstdlib
+future cstring
 future exception
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
+future stdexcept
+future string
 future system_error
 future thread
 future type_traits
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
@@ -483,7 +463,14 @@
 iterator variant
 iterator version
 latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
+latch type_traits
 latch version
 limits type_traits
 limits version
@@ -508,6 +495,7 @@
 list version
 locale atomic
 locale cctype
+locale cerrno
 locale concepts
 locale cstdarg
 locale cstddef
@@ -571,11 +559,13 @@
 memory_resource tuple
 memory_resource version
 mutex atomic
+mutex cerrno
 mutex concepts
 mutex cstddef
 mutex cstdint
 mutex cstdlib
 mutex cstring
+mutex ctime
 mutex functional
 mutex initializer_list
 mutex iosfwd
@@ -583,6 +573,7 @@
 mutex new
 mutex ratio
 mutex stdexcept
+mutex string
 mutex system_error
 mutex tuple
 mutex type_traits
@@ -627,6 +618,7 @@
 optional version
 ostream atomic
 ostream bitset
+ostream cerrno
 ostream concepts
 ostream cstddef
 ostream cstdint
@@ -641,6 +633,7 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream type_traits
 ostream typeinfo
 ostream version
@@ -727,6 +720,8 @@
 scoped_allocator version
 semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -747,6 +742,16 @@
 set tuple
 set type_traits
 set version
+shared_mutex cerrno
+shared_mutex cstddef
+shared_mutex ctime
+shared_mutex iosfwd
+shared_mutex limits
+shared_mutex ratio
+shared_mutex stdexcept
+shared_mutex string
+shared_mutex system_error
+shared_mutex type_traits
 shared_mutex version
 source_location cstdint
 source_location version
@@ -834,6 +839,8 @@
 system_error string
 system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread chrono
 thread compare
 thread cstddef
@@ -843,11 +850,16 @@
 thread functional
 thread iosfwd
 thread limits
+thread locale
 thread new
 thread ratio
+thread stdexcept
+thread string
+thread string_view
 thread system_error
 thread tuple
 thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx14.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx14.csv
index 0d10e23..3de4afa 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx14.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx14.csv
@@ -51,6 +51,7 @@
 atomic compare
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
@@ -73,6 +74,7 @@
 barrier stdexcept
 barrier type_traits
 barrier variant
+barrier version
 bit cstdint
 bit cstdlib
 bit iosfwd
@@ -105,11 +107,13 @@
 charconv iosfwd
 charconv limits
 charconv type_traits
+chrono bit
 chrono compare
 chrono concepts
 chrono cstddef
 chrono cstdint
 chrono cstdlib
+chrono cstring
 chrono ctime
 chrono limits
 chrono ratio
@@ -154,17 +158,20 @@
 concepts type_traits
 concepts version
 condition_variable atomic
+condition_variable cerrno
 condition_variable concepts
 condition_variable cstddef
 condition_variable cstdint
 condition_variable cstdlib
 condition_variable cstring
+condition_variable ctime
 condition_variable initializer_list
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
+condition_variable string
 condition_variable system_error
 condition_variable type_traits
 condition_variable typeinfo
@@ -207,46 +214,13 @@
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine atomic
-experimental/coroutine climits
-experimental/coroutine cmath
-experimental/coroutine compare
-experimental/coroutine concepts
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine ctime
-experimental/coroutine initializer_list
-experimental/coroutine iosfwd
-experimental/coroutine iterator
-experimental/coroutine limits
-experimental/coroutine memory
-experimental/coroutine new
-experimental/coroutine ratio
-experimental/coroutine stdexcept
-experimental/coroutine tuple
-experimental/coroutine type_traits
-experimental/coroutine typeinfo
-experimental/coroutine utility
-experimental/coroutine variant
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -327,7 +301,6 @@
 ext/hash_set new
 ext/hash_set string
 ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem concepts
 filesystem cstddef
@@ -346,12 +319,10 @@
 filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -362,7 +333,6 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list algorithm
@@ -426,16 +396,26 @@
 functional utility
 functional vector
 functional version
+future atomic
+future cerrno
 future chrono
 future cstddef
+future cstdint
+future cstdlib
+future cstring
 future exception
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
+future stdexcept
+future string
 future system_error
 future thread
 future type_traits
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
@@ -485,7 +465,14 @@
 iterator variant
 iterator version
 latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
+latch type_traits
 latch version
 limits type_traits
 limits version
@@ -510,6 +497,7 @@
 list version
 locale atomic
 locale cctype
+locale cerrno
 locale concepts
 locale cstdarg
 locale cstddef
@@ -573,11 +561,13 @@
 memory_resource tuple
 memory_resource version
 mutex atomic
+mutex cerrno
 mutex concepts
 mutex cstddef
 mutex cstdint
 mutex cstdlib
 mutex cstring
+mutex ctime
 mutex functional
 mutex initializer_list
 mutex iosfwd
@@ -585,6 +575,7 @@
 mutex new
 mutex ratio
 mutex stdexcept
+mutex string
 mutex system_error
 mutex tuple
 mutex type_traits
@@ -629,6 +620,7 @@
 optional version
 ostream atomic
 ostream bitset
+ostream cerrno
 ostream concepts
 ostream cstddef
 ostream cstdint
@@ -643,6 +635,7 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream type_traits
 ostream typeinfo
 ostream version
@@ -729,6 +722,8 @@
 scoped_allocator version
 semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -749,11 +744,14 @@
 set tuple
 set type_traits
 set version
+shared_mutex cerrno
 shared_mutex cstddef
 shared_mutex ctime
 shared_mutex iosfwd
 shared_mutex limits
 shared_mutex ratio
+shared_mutex stdexcept
+shared_mutex string
 shared_mutex system_error
 shared_mutex type_traits
 shared_mutex version
@@ -843,6 +841,8 @@
 system_error string
 system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread chrono
 thread compare
 thread cstddef
@@ -852,11 +852,16 @@
 thread functional
 thread iosfwd
 thread limits
+thread locale
 thread new
 thread ratio
+thread stdexcept
+thread string
+thread string_view
 thread system_error
 thread tuple
 thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx17.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx17.csv
index 0d10e23..3de4afa 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx17.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx17.csv
@@ -51,6 +51,7 @@
 atomic compare
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
@@ -73,6 +74,7 @@
 barrier stdexcept
 barrier type_traits
 barrier variant
+barrier version
 bit cstdint
 bit cstdlib
 bit iosfwd
@@ -105,11 +107,13 @@
 charconv iosfwd
 charconv limits
 charconv type_traits
+chrono bit
 chrono compare
 chrono concepts
 chrono cstddef
 chrono cstdint
 chrono cstdlib
+chrono cstring
 chrono ctime
 chrono limits
 chrono ratio
@@ -154,17 +158,20 @@
 concepts type_traits
 concepts version
 condition_variable atomic
+condition_variable cerrno
 condition_variable concepts
 condition_variable cstddef
 condition_variable cstdint
 condition_variable cstdlib
 condition_variable cstring
+condition_variable ctime
 condition_variable initializer_list
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
+condition_variable string
 condition_variable system_error
 condition_variable type_traits
 condition_variable typeinfo
@@ -207,46 +214,13 @@
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine atomic
-experimental/coroutine climits
-experimental/coroutine cmath
-experimental/coroutine compare
-experimental/coroutine concepts
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine ctime
-experimental/coroutine initializer_list
-experimental/coroutine iosfwd
-experimental/coroutine iterator
-experimental/coroutine limits
-experimental/coroutine memory
-experimental/coroutine new
-experimental/coroutine ratio
-experimental/coroutine stdexcept
-experimental/coroutine tuple
-experimental/coroutine type_traits
-experimental/coroutine typeinfo
-experimental/coroutine utility
-experimental/coroutine variant
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -327,7 +301,6 @@
 ext/hash_set new
 ext/hash_set string
 ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem concepts
 filesystem cstddef
@@ -346,12 +319,10 @@
 filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -362,7 +333,6 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list algorithm
@@ -426,16 +396,26 @@
 functional utility
 functional vector
 functional version
+future atomic
+future cerrno
 future chrono
 future cstddef
+future cstdint
+future cstdlib
+future cstring
 future exception
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
+future stdexcept
+future string
 future system_error
 future thread
 future type_traits
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
@@ -485,7 +465,14 @@
 iterator variant
 iterator version
 latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
+latch type_traits
 latch version
 limits type_traits
 limits version
@@ -510,6 +497,7 @@
 list version
 locale atomic
 locale cctype
+locale cerrno
 locale concepts
 locale cstdarg
 locale cstddef
@@ -573,11 +561,13 @@
 memory_resource tuple
 memory_resource version
 mutex atomic
+mutex cerrno
 mutex concepts
 mutex cstddef
 mutex cstdint
 mutex cstdlib
 mutex cstring
+mutex ctime
 mutex functional
 mutex initializer_list
 mutex iosfwd
@@ -585,6 +575,7 @@
 mutex new
 mutex ratio
 mutex stdexcept
+mutex string
 mutex system_error
 mutex tuple
 mutex type_traits
@@ -629,6 +620,7 @@
 optional version
 ostream atomic
 ostream bitset
+ostream cerrno
 ostream concepts
 ostream cstddef
 ostream cstdint
@@ -643,6 +635,7 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream type_traits
 ostream typeinfo
 ostream version
@@ -729,6 +722,8 @@
 scoped_allocator version
 semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -749,11 +744,14 @@
 set tuple
 set type_traits
 set version
+shared_mutex cerrno
 shared_mutex cstddef
 shared_mutex ctime
 shared_mutex iosfwd
 shared_mutex limits
 shared_mutex ratio
+shared_mutex stdexcept
+shared_mutex string
 shared_mutex system_error
 shared_mutex type_traits
 shared_mutex version
@@ -843,6 +841,8 @@
 system_error string
 system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread chrono
 thread compare
 thread cstddef
@@ -852,11 +852,16 @@
 thread functional
 thread iosfwd
 thread limits
+thread locale
 thread new
 thread ratio
+thread stdexcept
+thread string
+thread string_view
 thread system_error
 thread tuple
 thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx20.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx20.csv
index 8f47b61..81a3b0c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx20.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx20.csv
@@ -49,6 +49,7 @@
 atomic compare
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
@@ -71,6 +72,7 @@
 barrier stdexcept
 barrier type_traits
 barrier variant
+barrier version
 bit cstdint
 bit cstdlib
 bit iosfwd
@@ -163,17 +165,20 @@
 concepts type_traits
 concepts version
 condition_variable atomic
+condition_variable cerrno
 condition_variable concepts
 condition_variable cstddef
 condition_variable cstdint
 condition_variable cstdlib
 condition_variable cstring
+condition_variable ctime
 condition_variable initializer_list
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
+condition_variable string
 condition_variable system_error
 condition_variable type_traits
 condition_variable typeinfo
@@ -216,46 +221,13 @@
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine atomic
-experimental/coroutine climits
-experimental/coroutine cmath
-experimental/coroutine compare
-experimental/coroutine concepts
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine ctime
-experimental/coroutine initializer_list
-experimental/coroutine iosfwd
-experimental/coroutine iterator
-experimental/coroutine limits
-experimental/coroutine memory
-experimental/coroutine new
-experimental/coroutine ratio
-experimental/coroutine stdexcept
-experimental/coroutine tuple
-experimental/coroutine type_traits
-experimental/coroutine typeinfo
-experimental/coroutine utility
-experimental/coroutine variant
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -336,7 +308,6 @@
 ext/hash_set new
 ext/hash_set string
 ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem concepts
 filesystem cstddef
@@ -355,12 +326,10 @@
 filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -371,7 +340,6 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list algorithm
@@ -435,15 +403,25 @@
 functional utility
 functional vector
 functional version
+future atomic
+future cerrno
 future cstddef
+future cstdint
+future cstdlib
+future cstring
 future exception
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
+future stdexcept
+future string
 future system_error
 future thread
 future type_traits
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
@@ -493,7 +471,14 @@
 iterator variant
 iterator version
 latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
+latch type_traits
 latch version
 limits type_traits
 limits version
@@ -518,6 +503,7 @@
 list version
 locale atomic
 locale cctype
+locale cerrno
 locale concepts
 locale cstdarg
 locale cstddef
@@ -581,11 +567,13 @@
 memory_resource tuple
 memory_resource version
 mutex atomic
+mutex cerrno
 mutex concepts
 mutex cstddef
 mutex cstdint
 mutex cstdlib
 mutex cstring
+mutex ctime
 mutex functional
 mutex initializer_list
 mutex iosfwd
@@ -593,6 +581,7 @@
 mutex new
 mutex ratio
 mutex stdexcept
+mutex string
 mutex system_error
 mutex tuple
 mutex type_traits
@@ -637,6 +626,7 @@
 optional version
 ostream atomic
 ostream bitset
+ostream cerrno
 ostream concepts
 ostream cstddef
 ostream cstdint
@@ -651,6 +641,7 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream type_traits
 ostream typeinfo
 ostream version
@@ -737,6 +728,8 @@
 scoped_allocator version
 semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -757,11 +750,14 @@
 set tuple
 set type_traits
 set version
+shared_mutex cerrno
 shared_mutex cstddef
 shared_mutex ctime
 shared_mutex iosfwd
 shared_mutex limits
 shared_mutex ratio
+shared_mutex stdexcept
+shared_mutex string
 shared_mutex system_error
 shared_mutex type_traits
 shared_mutex version
@@ -851,19 +847,27 @@
 system_error string
 system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread compare
 thread cstddef
 thread cstdint
+thread cstdlib
 thread cstring
 thread ctime
 thread functional
 thread iosfwd
 thread limits
+thread locale
 thread new
 thread ratio
+thread stdexcept
+thread string
+thread string_view
 thread system_error
 thread tuple
 thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
diff --git a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx2b.csv b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx2b.csv
index 23cc6d7..c444ff9 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx2b.csv
+++ b/third_party/llvm-project/libcxx/test/libcxx/transitive_includes/cxx2b.csv
@@ -1,43 +1,36 @@
-algorithm bit
 algorithm climits
 algorithm cstddef
 algorithm cstdint
-algorithm cstdlib
 algorithm cstring
 algorithm initializer_list
 algorithm iosfwd
 algorithm limits
 algorithm new
-algorithm type_traits
 algorithm version
 any cstddef
 any cstdint
-any cstdlib
 any cstring
 any initializer_list
 any limits
 any new
 any stdexcept
-any type_traits
 any typeinfo
 any version
 array compare
 array cstddef
-array cstdlib
 array initializer_list
 array limits
 array stdexcept
-array type_traits
 array version
 atomic cstddef
 atomic cstdint
+atomic cstdlib
 atomic cstring
 atomic ctime
 atomic iosfwd
 atomic limits
 atomic ratio
 atomic version
-barrier atomic
 barrier cstddef
 barrier cstdint
 barrier cstring
@@ -46,14 +39,13 @@
 barrier limits
 barrier new
 barrier ratio
+barrier version
 bit cstdint
-bit cstdlib
 bit limits
 bit version
 bitset climits
 bitset cstddef
 bitset cstdint
-bitset cstdlib
 bitset cstring
 bitset initializer_list
 bitset iosfwd
@@ -61,27 +53,20 @@
 bitset new
 bitset stdexcept
 bitset string
-bitset type_traits
 bitset version
 ccomplex complex
 charconv cerrno
 charconv cmath
 charconv cstddef
 charconv cstdint
-charconv cstdlib
-charconv cstring
 charconv initializer_list
 charconv limits
-charconv type_traits
 chrono array
-chrono bit
-chrono charconv
 chrono cmath
 chrono compare
 chrono cstddef
 chrono cstdint
 chrono cstdlib
-chrono cstring
 chrono ctime
 chrono initializer_list
 chrono limits
@@ -94,7 +79,6 @@
 chrono string
 chrono string_view
 chrono tuple
-chrono type_traits
 chrono vector
 chrono version
 cinttypes cstdint
@@ -102,6 +86,7 @@
 codecvt cctype
 codecvt cstddef
 codecvt cstdint
+codecvt cstdlib
 codecvt cstring
 codecvt mutex
 codecvt string
@@ -115,22 +100,18 @@
 complex iosfwd
 complex sstream
 complex stdexcept
-complex type_traits
 complex version
 concepts cstddef
 concepts version
-condition_variable atomic
+condition_variable cerrno
 condition_variable cstddef
-condition_variable cstdint
-condition_variable cstdlib
-condition_variable cstring
-condition_variable initializer_list
+condition_variable ctime
 condition_variable iosfwd
 condition_variable limits
 condition_variable new
 condition_variable ratio
 condition_variable stdexcept
-condition_variable system_error
+condition_variable string
 condition_variable typeinfo
 condition_variable version
 coroutine compare
@@ -147,44 +128,25 @@
 deque compare
 deque cstddef
 deque cstdint
-deque cstdlib
 deque cstring
 deque initializer_list
 deque limits
 deque new
 deque stdexcept
 deque tuple
-deque type_traits
 deque version
 exception cstddef
 exception cstdlib
 exception version
 execution version
 expected cstddef
-expected cstdlib
-expected exception
 expected initializer_list
 expected new
 expected version
-experimental/algorithm algorithm
-experimental/algorithm cstddef
-experimental/algorithm type_traits
-experimental/coroutine cstddef
-experimental/coroutine cstdint
-experimental/coroutine cstring
-experimental/coroutine limits
-experimental/coroutine new
-experimental/coroutine type_traits
 experimental/deque deque
 experimental/deque experimental/memory_resource
 experimental/forward_list experimental/memory_resource
 experimental/forward_list forward_list
-experimental/functional array
-experimental/functional cstddef
-experimental/functional functional
-experimental/functional type_traits
-experimental/functional unordered_map
-experimental/functional vector
 experimental/iterator cstddef
 experimental/iterator iosfwd
 experimental/iterator iterator
@@ -193,15 +155,12 @@
 experimental/map experimental/memory_resource
 experimental/map map
 experimental/memory_resource cstddef
-experimental/memory_resource cstdlib
 experimental/memory_resource experimental/utility
 experimental/memory_resource limits
 experimental/memory_resource new
 experimental/memory_resource stdexcept
 experimental/memory_resource tuple
-experimental/memory_resource type_traits
 experimental/propagate_const cstddef
-experimental/propagate_const type_traits
 experimental/regex experimental/memory_resource
 experimental/regex experimental/string
 experimental/regex regex
@@ -232,7 +191,6 @@
 ext/hash_map new
 ext/hash_map stdexcept
 ext/hash_map string
-ext/hash_map type_traits
 ext/hash_set algorithm
 ext/hash_set cmath
 ext/hash_set cstddef
@@ -243,12 +201,9 @@
 ext/hash_set limits
 ext/hash_set new
 ext/hash_set string
-ext/hash_set type_traits
-filesystem cerrno
 filesystem compare
 filesystem cstddef
 filesystem cstdint
-filesystem cstdlib
 filesystem ctime
 filesystem iomanip
 filesystem iosfwd
@@ -258,16 +213,12 @@
 filesystem ratio
 filesystem string
 filesystem string_view
-filesystem system_error
-filesystem type_traits
 filesystem version
 format array
-format bit
-format charconv
+format cmath
 format cstddef
 format cstdint
 format cstdlib
-format cstring
 format initializer_list
 format limits
 format locale
@@ -278,20 +229,17 @@
 format string
 format string_view
 format tuple
-format type_traits
 format vector
 format version
 forward_list compare
 forward_list cstddef
 forward_list cstdint
-forward_list cstdlib
 forward_list cstring
 forward_list initializer_list
 forward_list limits
 forward_list new
 forward_list stdexcept
 forward_list tuple
-forward_list type_traits
 forward_list version
 fstream cctype
 fstream cstddef
@@ -308,12 +256,9 @@
 fstream typeinfo
 fstream version
 functional array
-functional atomic
 functional cstddef
 functional cstdint
-functional cstdlib
 functional cstring
-functional exception
 functional initializer_list
 functional iosfwd
 functional limits
@@ -321,32 +266,37 @@
 functional new
 functional stdexcept
 functional tuple
-functional type_traits
 functional typeinfo
 functional unordered_map
 functional vector
 functional version
+future cerrno
 future cstddef
-future exception
+future cstdint
+future cstdlib
+future cstring
+future initializer_list
+future iosfwd
 future limits
 future mutex
 future new
 future ratio
-future system_error
+future stdexcept
+future string
 future thread
+future typeinfo
 future version
 initializer_list cstddef
 iomanip istream
 iomanip version
-ios atomic
 ios cctype
 ios cstddef
 ios cstdint
+ios cstdlib
 ios cstring
 ios iosfwd
 ios mutex
 ios string
-ios system_error
 ios version
 iosfwd version
 iostream ios
@@ -361,29 +311,32 @@
 iterator compare
 iterator concepts
 iterator cstddef
-iterator cstdlib
 iterator initializer_list
 iterator iosfwd
 iterator limits
 iterator variant
 iterator version
-latch atomic
+latch cstddef
+latch cstdint
+latch cstring
+latch ctime
+latch iosfwd
 latch limits
+latch ratio
 latch version
 limits version
 list compare
 list cstddef
 list cstdint
-list cstdlib
 list cstring
 list initializer_list
 list limits
 list new
 list stdexcept
 list tuple
-list type_traits
 list version
 locale cctype
+locale cerrno
 locale cstddef
 locale cstdint
 locale cstdio
@@ -401,20 +354,16 @@
 locale version
 map compare
 map cstddef
-map cstdlib
 map initializer_list
 map limits
 map new
 map optional
 map stdexcept
 map tuple
-map type_traits
 map version
-memory atomic
 memory compare
 memory cstddef
 memory cstdint
-memory cstdlib
 memory cstring
 memory initializer_list
 memory iosfwd
@@ -432,24 +381,21 @@
 memory_resource stdexcept
 memory_resource tuple
 memory_resource version
-mutex atomic
+mutex cerrno
 mutex cstddef
 mutex cstdint
-mutex cstdlib
-mutex cstring
-mutex initializer_list
+mutex ctime
 mutex iosfwd
 mutex limits
 mutex new
 mutex ratio
 mutex stdexcept
-mutex system_error
+mutex string
 mutex tuple
 mutex typeinfo
 mutex version
 new cstddef
 new cstdlib
-new exception
 new version
 numbers version
 numeric cmath
@@ -464,13 +410,11 @@
 optional limits
 optional new
 optional stdexcept
-optional type_traits
 optional version
-ostream atomic
 ostream bitset
+ostream cerrno
 ostream cstddef
 ostream cstdint
-ostream cstdlib
 ostream cstring
 ostream initializer_list
 ostream ios
@@ -480,33 +424,28 @@
 ostream new
 ostream stdexcept
 ostream streambuf
+ostream string
 ostream typeinfo
 ostream version
 queue compare
 queue cstddef
-queue cstdlib
 queue deque
 queue initializer_list
 queue limits
-queue type_traits
 queue vector
 queue version
-random bit
 random cmath
 random cstddef
 random cstdint
-random cstdlib
 random initializer_list
 random iosfwd
 random limits
 random numeric
 random string
-random type_traits
 random vector
 random version
 ranges compare
 ranges cstddef
-ranges cstdlib
 ranges initializer_list
 ranges iosfwd
 ranges iterator
@@ -515,7 +454,6 @@
 ranges optional
 ranges span
 ranges tuple
-ranges type_traits
 ranges variant
 ranges version
 ratio climits
@@ -533,7 +471,6 @@
 regex mutex
 regex stdexcept
 regex string
-regex type_traits
 regex vector
 regex version
 scoped_allocator cstddef
@@ -541,8 +478,9 @@
 scoped_allocator new
 scoped_allocator tuple
 scoped_allocator version
-semaphore atomic
 semaphore cstddef
+semaphore cstdint
+semaphore cstring
 semaphore ctime
 semaphore iosfwd
 semaphore limits
@@ -550,21 +488,21 @@
 semaphore version
 set compare
 set cstddef
-set cstdlib
 set initializer_list
 set limits
 set new
 set optional
 set stdexcept
 set tuple
-set type_traits
 set version
+shared_mutex cerrno
 shared_mutex cstddef
 shared_mutex ctime
 shared_mutex iosfwd
 shared_mutex limits
 shared_mutex ratio
-shared_mutex system_error
+shared_mutex stdexcept
+shared_mutex string
 shared_mutex version
 source_location cstdint
 source_location version
@@ -572,7 +510,6 @@
 span cstddef
 span initializer_list
 span limits
-span type_traits
 span version
 sstream cstddef
 sstream istream
@@ -583,10 +520,7 @@
 stack cstddef
 stack deque
 stack initializer_list
-stack type_traits
 stack version
-stdexcept cstdlib
-stdexcept exception
 stdexcept iosfwd
 streambuf cstdint
 streambuf ios
@@ -597,7 +531,6 @@
 string cstddef
 string cstdint
 string cstdio
-string cstdlib
 string cstring
 string cwchar
 string initializer_list
@@ -607,20 +540,17 @@
 string stdexcept
 string string_view
 string tuple
-string type_traits
 string version
 string_view compare
 string_view cstddef
 string_view cstdint
 string_view cstdio
-string_view cstdlib
 string_view cstring
 string_view cwchar
 string_view initializer_list
 string_view iosfwd
 string_view limits
 string_view stdexcept
-string_view type_traits
 string_view version
 strstream istream
 strstream ostream
@@ -628,25 +558,25 @@
 system_error cerrno
 system_error compare
 system_error cstddef
-system_error cstdint
-system_error cstring
-system_error limits
 system_error stdexcept
 system_error string
-system_error type_traits
 system_error version
+thread array
+thread cerrno
 thread compare
 thread cstddef
 thread cstdint
-thread cstring
+thread cstdlib
 thread ctime
 thread iosfwd
 thread limits
-thread new
+thread locale
 thread ratio
-thread system_error
+thread stdexcept
+thread string
+thread string_view
 thread tuple
-thread type_traits
+thread vector
 thread version
 tuple compare
 tuple cstddef
@@ -659,14 +589,10 @@
 typeindex version
 typeinfo cstddef
 typeinfo cstdint
-typeinfo cstdlib
-typeinfo exception
-typeinfo type_traits
 unordered_map cmath
 unordered_map compare
 unordered_map cstddef
 unordered_map cstdint
-unordered_map cstdlib
 unordered_map cstring
 unordered_map initializer_list
 unordered_map limits
@@ -674,13 +600,11 @@
 unordered_map optional
 unordered_map stdexcept
 unordered_map tuple
-unordered_map type_traits
 unordered_map version
 unordered_set cmath
 unordered_set compare
 unordered_set cstddef
 unordered_set cstdint
-unordered_set cstdlib
 unordered_set cstring
 unordered_set initializer_list
 unordered_set limits
@@ -688,7 +612,6 @@
 unordered_set optional
 unordered_set stdexcept
 unordered_set tuple
-unordered_set type_traits
 unordered_set version
 utility compare
 utility cstddef
@@ -697,18 +620,16 @@
 utility version
 valarray cmath
 valarray cstddef
-valarray cstdlib
+valarray cstdint
 valarray initializer_list
 valarray limits
 valarray new
 valarray stdexcept
-valarray type_traits
 valarray version
 variant compare
 variant cstddef
 variant cstdint
 variant cstring
-variant exception
 variant initializer_list
 variant limits
 variant new
@@ -718,7 +639,6 @@
 vector compare
 vector cstddef
 vector cstdint
-vector cstdlib
 vector cstring
 vector initializer_list
 vector iosfwd
@@ -726,5 +646,4 @@
 vector new
 vector stdexcept
 vector tuple
-vector type_traits
 vector version
diff --git a/third_party/llvm-project/libcxx/test/libcxx/type_traits/convert_to_integral.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/type_traits/convert_to_integral.pass.cpp
index 2972191..f1036b3 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/type_traits/convert_to_integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/type_traits/convert_to_integral.pass.cpp
@@ -94,12 +94,12 @@
 #endif
   check_integral_types<char16_t, int>();
   // On some platforms, unsigned int and long are the same size.  These
-  // platforms have a choice of making uint32_t an int or a long.  However
+  // platforms have a choice of making std::uint32_t an int or a long.  However
   // char32_t must promote to an unsigned int on these platforms [conv.prom].
   // Use the following logic to make the test work on such platforms.
-  // (sizeof(uint32_t) == sizeof(unsigned int)) ? unsigned int : uint32_t;
-  typedef std::conditional<sizeof(uint32_t) == sizeof(unsigned int),
-                           unsigned int, uint32_t>::type char_integral;
+  // (sizeof(std::uint32_t) == sizeof(unsigned int)) ? unsigned int : std::uint32_t;
+  typedef std::conditional<sizeof(std::uint32_t) == sizeof(unsigned int),
+                           unsigned int, std::uint32_t>::type char_integral;
   check_integral_types<char32_t, char_integral>();
   check_integral_types<short, int>();
   check_integral_types<unsigned short, int>();
diff --git a/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_always_bitcastable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_always_bitcastable.compile.pass.cpp
index 4e78fa1..9bbb85f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_always_bitcastable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_always_bitcastable.compile.pass.cpp
@@ -52,8 +52,8 @@
 
 template <bool Expected, class Types1, class Types2 = Types1>
 constexpr void check() {
-  meta::for_each(Types1{}, []<class T>() {
-    meta::for_each(Types2{}, []<class U>() {
+  types::for_each(Types1{}, []<class T>() {
+    types::for_each(Types2{}, []<class U>() {
       check_with_cv<Expected, T, U>();
     });
   });
@@ -71,91 +71,91 @@
     // Bit-castable arithmetic types.
 
     // 8-bit types.
-    using integral_8 = meta::type_list<char8_t, int8_t, uint8_t>;
-    using chars = meta::type_list<char, unsigned char, signed char>;
+    using integral_8 = types::type_list<char8_t, std::int8_t, std::uint8_t>;
+    using chars = types::type_list<char, unsigned char, signed char>;
 #if CHAR_BIT == 8
-    check<true, meta::concatenate_t<integral_8, chars>>();
+    check<true, types::concatenate_t<integral_8, chars>>();
 #else
     check<true, integral_8>();
     check<true, chars>();
 #endif
 
     // 16-bit types.
-    using integral_16 = meta::type_list<char16_t, int16_t, uint16_t>;
+    using integral_16 = types::type_list<char16_t, std::int16_t, std::uint16_t>;
 #if !defined(TEST_HAS_NO_WIDE_CHARACTERS) && __WCHAR_WIDTH__ == 16
-    check<true, meta::concatenate_t<integral_16, meta::type_list<wchar_t>>>();
+    check<true, types::concatenate_t<integral_16, types::type_list<wchar_t>>>();
 #else
     check<true, integral_16>();
 #endif
 
     // 32-bit types.
-    using integral_32 = meta::type_list<char32_t, int32_t, uint32_t>;
+    using integral_32 = types::type_list<char32_t, std::int32_t, std::uint32_t>;
 #if !defined(TEST_HAS_NO_WIDE_CHARACTERS) && __WCHAR_WIDTH__ == 32
-    check<true, meta::concatenate_t<integral_32, meta::type_list<wchar_t>>>();
+    check<true, types::concatenate_t<integral_32, types::type_list<wchar_t>>>();
 #else
     check<true, integral_32>();
 #endif
 
     // 64-bit types.
-    using integral_64 = meta::type_list<int64_t, uint64_t>;
+    using integral_64 = types::type_list<std::int64_t, std::uint64_t>;
     check<true, integral_64>();
 
     // 128-bit types.
 #ifndef TEST_HAS_NO_INT128
-    check<true, meta::type_list<__int128_t, __uint128_t>>();
+    check<true, types::type_list<__int128_t, __uint128_t>>();
 #endif
 
     // Bool.
-    check<true, meta::type_list<bool>, meta::concatenate_t<meta::type_list<bool>, integral_8>>();
+    check<true, types::type_list<bool>, types::concatenate_t<types::type_list<bool>, integral_8>>();
 
     // Non-bit-castable arithmetic types.
 
     // Floating-point.
-    check_both_ways<false, meta::floating_point_types, meta::integral_types>();
-    check_both_ways<false, meta::type_list<float>, meta::type_list<double, long double>>();
-    check_both_ways<false, meta::type_list<double>, meta::type_list<float, long double>>();
-    check_both_ways<false, meta::type_list<long double>, meta::type_list<float, double>>();
+    check_both_ways<false, types::floating_point_types, types::integral_types>();
+    check_both_ways<false, types::type_list<float>, types::type_list<double, long double>>();
+    check_both_ways<false, types::type_list<double>, types::type_list<float, long double>>();
+    check_both_ways<false, types::type_list<long double>, types::type_list<float, double>>();
 
     // Different sizes.
-    check_both_ways<false, integral_8, meta::concatenate_t<integral_16, integral_32, integral_64>>();
-    check_both_ways<false, integral_16, meta::concatenate_t<integral_8, integral_32, integral_64>>();
-    check_both_ways<false, integral_32, meta::concatenate_t<integral_8, integral_16, integral_64>>();
-    check_both_ways<false, integral_64, meta::concatenate_t<integral_8, integral_16, integral_32>>();
+    check_both_ways<false, integral_8, types::concatenate_t<integral_16, integral_32, integral_64>>();
+    check_both_ways<false, integral_16, types::concatenate_t<integral_8, integral_32, integral_64>>();
+    check_both_ways<false, integral_32, types::concatenate_t<integral_8, integral_16, integral_64>>();
+    check_both_ways<false, integral_64, types::concatenate_t<integral_8, integral_16, integral_32>>();
 
     // Different representations -- can convert from bool to other integral types, but not vice versa.
-    check<true, meta::type_list<bool>, integral_8>();
-    using larger_than_bool = meta::concatenate_t<
+    check<true, types::type_list<bool>, integral_8>();
+    using larger_than_bool = types::concatenate_t<
       integral_16,
       integral_32,
       integral_64,
-      meta::floating_point_types>;
-    check<false, meta::type_list<bool>, larger_than_bool>();
-    check<false, meta::concatenate_t<integral_8, larger_than_bool>, meta::type_list<bool>>();
+      types::floating_point_types>;
+    check<false, types::type_list<bool>, larger_than_bool>();
+    check<false, types::concatenate_t<integral_8, larger_than_bool>, types::type_list<bool>>();
 
     // Different representations -- floating point vs. integral.
-    check_both_ways<false, meta::floating_point_types, meta::integral_types>();
+    check_both_ways<false, types::floating_point_types, types::integral_types>();
   }
 
   // Enumerations.
   {
     enum E1 { Value1 };
     enum E2 { Value2 };
-    check<true, meta::type_list<E1>>();
-    check_both_ways<false, meta::type_list<E1>, meta::type_list<E2>>();
+    check<true, types::type_list<E1>>();
+    check_both_ways<false, types::type_list<E1>, types::type_list<E2>>();
 
     enum class ScopedE1 { Value1 };
     enum class ScopedE2 { Value1 };
-    check<true, meta::type_list<ScopedE1>>();
-    check_both_ways<false, meta::type_list<ScopedE1>, meta::type_list<ScopedE2>>();
+    check<true, types::type_list<ScopedE1>>();
+    check_both_ways<false, types::type_list<ScopedE1>, types::type_list<ScopedE2>>();
   }
 
   // Pointers.
   {
-    check<true, meta::type_list<int*>>();
-    check_both_ways<false, meta::type_list<int*>, meta::type_list<const int*, long*, void*>>();
+    check<true, types::type_list<int*>>();
+    check_both_ways<false, types::type_list<int*>, types::type_list<const int*, long*, void*>>();
 
-    check<true, meta::type_list<FuncPtr1>>();
-    check_both_ways<false, meta::type_list<FuncPtr1>, meta::type_list<FuncPtr2>>();
+    check<true, types::type_list<FuncPtr1>>();
+    check_both_ways<false, types::type_list<FuncPtr1>, types::type_list<FuncPtr2>>();
   }
 
   // Pointers to members.
@@ -171,49 +171,49 @@
     using MemFuncPtr1 = decltype(&S::MemFunc1);
     using MemFuncPtr2 = decltype(&S::MemFunc2);
 
-    check<true, meta::type_list<MemObjPtr1>>();
-    check<true, meta::type_list<MemFuncPtr1>>();
-    check_both_ways<false, meta::type_list<MemObjPtr1>, meta::type_list<MemObjPtr2>>();
-    check_both_ways<false, meta::type_list<MemFuncPtr1>, meta::type_list<MemFuncPtr2>>();
+    check<true, types::type_list<MemObjPtr1>>();
+    check<true, types::type_list<MemFuncPtr1>>();
+    check_both_ways<false, types::type_list<MemObjPtr1>, types::type_list<MemObjPtr2>>();
+    check_both_ways<false, types::type_list<MemFuncPtr1>, types::type_list<MemFuncPtr2>>();
   }
 
   // Trivial classes.
   {
     struct S1 {};
-    check<true, meta::type_list<S1>>();
+    check<true, types::type_list<S1>>();
 
     struct S2 {};
-    check_both_ways<false, meta::type_list<S1>, meta::type_list<S2>>();
+    check_both_ways<false, types::type_list<S1>, types::type_list<S2>>();
 
     // Having a `volatile` member doesn't prevent a class type from being considered trivially copyable. This is
     // unfortunate behavior but it is consistent with the Standard.
     struct VolatileMembersS {
       volatile int x;
     };
-    check<true, meta::type_list<VolatileMembersS>>();
+    check<true, types::type_list<VolatileMembersS>>();
   }
 
   // Trivial unions.
   {
     union U1 {};
-    check<true, meta::type_list<U1>>();
+    check<true, types::type_list<U1>>();
 
     union U2 {};
-    check_both_ways<false, meta::type_list<U1>, meta::type_list<U2>>();
+    check_both_ways<false, types::type_list<U1>, types::type_list<U2>>();
 
     union VolatileMembersU {
       volatile int x;
     };
-    check<true, meta::type_list<VolatileMembersU>>();
+    check<true, types::type_list<VolatileMembersU>>();
   }
 
   // References are not objects, and thus are not bit-castable.
   {
-    check_both_ways<false, meta::type_list<int&>, meta::type_list<int&>>();
+    check_both_ways<false, types::type_list<int&>, types::type_list<int&>>();
   }
 
   // Arrays.
   {
-    check<true, meta::type_list<int[8]>>();
+    check<true, types::type_list<int[8]>>();
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_specialization.verify.cpp b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_specialization.verify.cpp
index 0dbdbf5..2fd1176 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_specialization.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_specialization.verify.cpp
@@ -19,4 +19,4 @@
 #include <utility>
 
 // expected-error@+1 {{template template argument has different template parameters than its corresponding template template parameter}}
-static_assert(!std::__is_specialization_v<std::pair<int, size_t>, std::array>);
+static_assert(!std::__is_specialization_v<std::pair<int, std::size_t>, std::array>);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_trivially_comparable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_trivially_comparable.compile.pass.cpp
new file mode 100644
index 0000000..6473c003
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/type_traits/is_trivially_comparable.compile.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -Wno-private-header
+
+#include <__type_traits/is_equality_comparable.h>
+
+enum Enum : int {};
+enum class EnumClass : int {};
+
+static_assert(std::__libcpp_is_trivially_equality_comparable<int, int>::value, "");
+static_assert(std::__libcpp_is_trivially_equality_comparable<const int, int>::value, "");
+static_assert(std::__libcpp_is_trivially_equality_comparable<int, const int>::value, "");
+
+static_assert(std::__libcpp_is_trivially_equality_comparable<unsigned int, unsigned int>::value, "");
+static_assert(std::__libcpp_is_trivially_equality_comparable<const unsigned int, unsigned int>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<unsigned int, int>::value, "");
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<long, int>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<int, long>::value, "");
+
+static_assert(std::__libcpp_is_trivially_equality_comparable<int*, int*>::value, "");
+static_assert(std::__libcpp_is_trivially_equality_comparable<int*, void*>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<int*, long*>::value, "");
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<Enum, int>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<EnumClass, int>::value, "");
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<float, int>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<double, long long>::value, "");
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<float, int>::value, "");
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<float, float>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<double, double>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<long double, long double>::value, "");
+
+struct S {
+  char c;
+};
+
+struct S2 {
+  char c;
+};
+
+struct VirtualBase : virtual S {};
+struct NonVirtualBase : S, S2 {};
+
+static_assert(!std::__libcpp_is_trivially_equality_comparable<S*, VirtualBase*>::value, "");
+static_assert(!std::__libcpp_is_trivially_equality_comparable<S2*, VirtualBase*>::value, "");
+
+// This is trivially_equality_comparable, but we can't detect it currently
+static_assert(!std::__libcpp_is_trivially_equality_comparable<S*, NonVirtualBase*>::value, "");
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
index 5c9cc38..c8dad0a 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -fno-exceptions -D_LIBCPP_ENABLE_ASSERTIONS
 
 // ADDITIONAL_COMPILE_FLAGS: -Wno-private-header
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.no_exceptions.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.no_exceptions.pass.cpp
index 0b6233e..d844f3c 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.no_exceptions.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.no_exceptions.pass.cpp
@@ -16,4 +16,6 @@
   auto guard = std::__make_exception_guard([] {});
   auto guard2 = std::move(guard);
   guard2.__complete();
+
+  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.odr.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.odr.sh.cpp
new file mode 100644
index 0000000..cfdda9a
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/exception_guard.odr.sh.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// This test relies on `typeid` and thus requires `-frtti`.
+// UNSUPPORTED: no-rtti
+
+// Make sure that we don't get ODR violations with __exception_guard when
+// linking together TUs compiled with different values of -f[no-]exceptions.
+
+// RUN: %{cxx} %s %{flags} %{compile_flags} -c -o %t.except.o   -O1 -Wno-private-header -fexceptions
+// RUN: %{cxx} %s %{flags} %{compile_flags} -c -o %t.noexcept.o -O1 -Wno-private-header -fno-exceptions
+// RUN: %{cxx} %{flags} %{link_flags} -o %t.exe %t.except.o %t.noexcept.o
+// RUN: %{run}
+
+#include <__utility/exception_guard.h>
+#include <cassert>
+#include <cstring>
+#include <typeinfo>
+
+struct Rollback {
+  void operator()() {}
+};
+
+#if defined(__cpp_exceptions) && __cpp_exceptions >= 199711L
+
+const char* func();
+
+int main(int, char**) {
+  assert(std::strcmp(typeid(std::__exception_guard<Rollback>).name(), func()) != 0);
+
+  return 0;
+}
+
+#else
+
+const char* func() { return typeid(std::__exception_guard<Rollback>).name(); }
+
+#endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
index 82fb35a..3dd1ed6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const T* operator->() const noexcept;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
index d1ab321..04f1a7d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const T& operator*() const & noexcept;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
index 814b47d..274e207 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const E& error() const & noexcept;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
index d75f15d..90757f3 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr void operator*() const noexcept;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
index 1e20cc5..211635d 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const E& error() const & noexcept;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
index 7f21f13..2775539 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
@@ -18,21 +18,21 @@
 
 #include "test_macros.h"
 
-static_assert(std::is_same_v<std::underlying_type_t<std::__format::__arg_t>, uint8_t>);
+static_assert(std::is_same_v<std::underlying_type_t<std::__format::__arg_t>, std::uint8_t>);
 
-static_assert(uint8_t(std::__format::__arg_t::__none) == 0);
-static_assert(uint8_t(std::__format::__arg_t::__boolean) == 1);
-static_assert(uint8_t(std::__format::__arg_t::__char_type) == 2);
-static_assert(uint8_t(std::__format::__arg_t::__int) == 3);
-static_assert(uint8_t(std::__format::__arg_t::__long_long) == 4);
-static_assert(uint8_t(std::__format::__arg_t::__i128) == 5);
-static_assert(uint8_t(std::__format::__arg_t::__unsigned) == 6);
-static_assert(uint8_t(std::__format::__arg_t::__unsigned_long_long) == 7);
-static_assert(uint8_t(std::__format::__arg_t::__u128) == 8);
-static_assert(uint8_t(std::__format::__arg_t::__float) == 9);
-static_assert(uint8_t(std::__format::__arg_t::__double) == 10);
-static_assert(uint8_t(std::__format::__arg_t::__long_double) == 11);
-static_assert(uint8_t(std::__format::__arg_t::__const_char_type_ptr) == 12);
-static_assert(uint8_t(std::__format::__arg_t::__string_view) == 13);
-static_assert(uint8_t(std::__format::__arg_t::__ptr) == 14);
-static_assert(uint8_t(std::__format::__arg_t::__handle) == 15);
+static_assert(std::uint8_t(std::__format::__arg_t::__none) == 0);
+static_assert(std::uint8_t(std::__format::__arg_t::__boolean) == 1);
+static_assert(std::uint8_t(std::__format::__arg_t::__char_type) == 2);
+static_assert(std::uint8_t(std::__format::__arg_t::__int) == 3);
+static_assert(std::uint8_t(std::__format::__arg_t::__long_long) == 4);
+static_assert(std::uint8_t(std::__format::__arg_t::__i128) == 5);
+static_assert(std::uint8_t(std::__format::__arg_t::__unsigned) == 6);
+static_assert(std::uint8_t(std::__format::__arg_t::__unsigned_long_long) == 7);
+static_assert(std::uint8_t(std::__format::__arg_t::__u128) == 8);
+static_assert(std::uint8_t(std::__format::__arg_t::__float) == 9);
+static_assert(std::uint8_t(std::__format::__arg_t::__double) == 10);
+static_assert(std::uint8_t(std::__format::__arg_t::__long_double) == 11);
+static_assert(std::uint8_t(std::__format::__arg_t::__const_char_type_ptr) == 12);
+static_assert(std::uint8_t(std::__format::__arg_t::__string_view) == 13);
+static_assert(std::uint8_t(std::__format::__arg_t::__ptr) == 14);
+static_assert(std::uint8_t(std::__format::__arg_t::__handle) == 15);
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.formatter/format.context/types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.formatter/format.context/types.compile.pass.cpp
index 159ad5b..63c25b6 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.formatter/format.context/types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.formatter/format.context/types.compile.pass.cpp
@@ -24,6 +24,7 @@
 // using wformat_context = basic_format_context<unspecified, wchar_t>;
 
 #include <format>
+#include <iterator>
 #include <string_view>
 #include <type_traits>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.h b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.h
index f281222..204dcac 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.h
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.h
@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 // WARNING, this entire header is generated by
-// utiles/generate_extended_grapheme_cluster_test.py
+// utils/generate_extended_grapheme_cluster_test.py
 // DO NOT MODIFY!
 
 // UNICODE, INC. LICENSE AGREEMENT - DATA FILES AND SOFTWARE
@@ -78,7 +78,7 @@
   /// The offset of the last code units of the extended grapheme clusters in the input.
   ///
   /// The vector has the same number of entries as \ref code_points.
-  std::vector<size_t> breaks;
+  std::vector<std::size_t> breaks;
 };
 
 /// The data for UTF-8.
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.pass.cpp
index 0592c08..512d278 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/format.string/format.string.std/extended_grapheme_cluster.pass.cpp
@@ -62,11 +62,11 @@
   for (const auto& d : data) {
     assert(d.code_points.size() == d.breaks.size());
 
-    std::__unicode::__extended_grapheme_cluster_view view{d.input.data(), d.input.data() + d.input.size()};
-    for (size_t i = 0; i < d.breaks.size(); ++i) {
+    std::__unicode::__extended_grapheme_cluster_view view{d.input.begin(), d.input.end()};
+    for (std::size_t i = 0; i < d.breaks.size(); ++i) {
       auto r = view.__consume();
       assert(r.__code_point_ == d.code_points[i]);
-      assert(r.__last_ == d.input.data() + d.breaks[i]);
+      assert(r.__last_ == d.input.begin() + d.breaks[i]);
     }
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/version.compile.pass.cpp
index 4c1be77..f4fa839 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/format/version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/format/version.compile.pass.cpp
@@ -17,6 +17,3 @@
 #ifndef _LIBCPP_VERSION
 #  error _LIBCPP_VERSION not defined
 #endif
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/abi_bug_cxx03_cxx11_example.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/abi_bug_cxx03_cxx11_example.sh.cpp
deleted file mode 100644
index 11384d8..0000000
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/abi_bug_cxx03_cxx11_example.sh.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// REQUIRES: clang || apple-clang
-// XFAIL: *
-
-// This tests is meant to demonstrate an existing ABI bug between the
-// C++03 and C++11 implementations of std::function. It is not a real test.
-
-// RUN: %{cxx} -c %s -o %t.first.o %{flags} %{compile_flags} -std=c++03 -g
-// RUN: %{cxx} -c %s -o %t.second.o -DWITH_MAIN %{flags} %{compile_flags} -g -std=c++11
-// RUN: %{cxx} -o %t.exe %t.first.o %t.second.o %{flags} %{link_flags} -g
-// RUN: %{run}
-
-#include <functional>
-#include <cassert>
-
-typedef std::function<void(int)> Func;
-
-Func CreateFunc();
-
-#ifndef WITH_MAIN
-// In C++03, the functions call operator, which is a part of the vtable,
-// is defined as 'void operator()(int)', but in C++11 it's
-// void operator()(int&&)'. So when the C++03 version is passed to C++11 code
-// the value of the integer is interpreted as its address.
-void test(int x) {
-  assert(x == 42);
-}
-Func CreateFunc() {
-  Func f(&test);
-  return f;
-}
-#else
-int main(int, char**) {
-  Func f = CreateFunc();
-  f(42);
-  return 0;
-}
-#endif
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
index 1f29528..11f0724 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
@@ -17,8 +17,8 @@
 
 #include "test_macros.h"
 
-typedef std::__murmur2_or_cityhash<uint32_t> Hash32;
-typedef std::__murmur2_or_cityhash<uint64_t> Hash64;
+typedef std::__murmur2_or_cityhash<std::uint32_t> Hash32;
+typedef std::__murmur2_or_cityhash<std::uint64_t> Hash64;
 
 void test(const void* key, int len) {
   for (int i=1; i <= len; ++i) {
@@ -35,8 +35,8 @@
       "00000000000000000000000000000000000000000000000000000000000000000000000",
       "1237546895+54+4554985416849484213464984765465464654564565645645646546456546546"
   };
-  const size_t NumCases = sizeof(TestCases)/sizeof(TestCases[0]);
-  for (size_t i=0; i < NumCases; ++i)
+  const std::size_t NumCases = sizeof(TestCases)/sizeof(TestCases[0]);
+  for (std::size_t i=0; i < NumCases; ++i)
     test(TestCases[i].data(), TestCases[i].length());
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/intseq/for_each_index_sequence.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/intseq/for_each_index_sequence.pass.cpp
index 77d7ddc..9934527 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/intseq/for_each_index_sequence.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/intseq/for_each_index_sequence.pass.cpp
@@ -19,7 +19,7 @@
 
 constexpr bool test() {
   int count = 0;
-  std::__for_each_index_sequence(std::make_index_sequence<8>(), [&]<size_t _Index> { count += _Index; });
+  std::__for_each_index_sequence(std::make_index_sequence<8>(), [&]<std::size_t _Index> { count += _Index; });
   assert(count == 28);
 
   return true;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/meta/stress_tests/stress_test_variant_overloads_impl.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/meta/stress_tests/stress_test_variant_overloads_impl.sh.cpp
index 6fdd023..58b9db4 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/meta/stress_tests/stress_test_variant_overloads_impl.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/meta/stress_tests/stress_test_variant_overloads_impl.sh.cpp
@@ -42,7 +42,7 @@
 #include "test_macros.h"
 #include "template_cost_testing.h"
 
-template <size_t Idx>
+template <std::size_t Idx>
 struct TestType {};
 
 template <class T>
@@ -54,7 +54,7 @@
 
 struct OverloadBase { void operator()() const; };
 
-template <class Tp, size_t Idx>
+template <class Tp, std::size_t Idx>
 struct Overload {
   auto operator()(Tp, Tp) const -> ID<Tp>;
 };
@@ -65,7 +65,7 @@
 template <class IdxSeq>
 struct MakeOverloads;
 
-template <size_t ..._Idx>
+template <std::size_t ..._Idx>
 struct MakeOverloads<std::__tuple_indices<_Idx...> > {
   template <class ...Types>
   using Apply = AllOverloads<Overload<Types, _Idx>...>;
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
index 068b2e7..0bca838 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
@@ -15,7 +15,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <optional>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
index dc3eda8..f0c2cf1 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
@@ -13,7 +13,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <optional>
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v1.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v1.pass.cpp
new file mode 100644
index 0000000..cdaaaca
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v1.pass.cpp
@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+
+// Test that the CityHash implementation returns the results we expect.
+//
+// Note that this implementation is technically incorrect, however changing it is
+// an ABI break. This test ensures that we don't unintentionally break the ABI v1
+// by "fixing" the hash implementation.
+// REQUIRES: libcpp-abi-version=1
+
+#include <cassert>
+#include <string>
+#include <utility>
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#  define CHOOSE_BY_ENDIANESS(little, big) (little)
+#else
+#  define CHOOSE_BY_ENDIANESS(little, big) (big)
+#endif
+
+std::string CityHash[] = {
+    {/* "abcdefgh" */ "\x61\x62\x63\x64\x65\x66\x67\x68"},
+    {/* "abcDefgh" */ "\x61\x62\x63\x44\x65\x66\x67\x68"},
+    {/* "CityHash" */ "\x43\x69\x74\x79\x48\x61\x73\x68"},
+    {/* "CitYHash" */ "\x43\x69\x74\x59\x48\x61\x73\x68"},
+};
+
+int main(int, char**) {
+  const std::pair<std::string, std::uint64_t> TestCases[] = {
+      {CityHash[0], CHOOSE_BY_ENDIANESS(0x87c69099911bab7eULL, 0x297621d7fa436a3ULL)},
+      {CityHash[1], CHOOSE_BY_ENDIANESS(0x87c69099911bab7eULL, 0xb17be531dde56e57ULL)},
+      {CityHash[2], CHOOSE_BY_ENDIANESS(0x85322632e188694aULL, 0xe14f578b688e266dULL)},
+      {CityHash[3], CHOOSE_BY_ENDIANESS(0x85322632e188694aULL, 0xca5a764a0450eac6ULL)},
+  };
+
+  std::__murmur2_or_cityhash<std::uint64_t> h64;
+  for (const auto& test_case : TestCases) {
+    assert(h64(test_case.first.data(), test_case.first.size()) == test_case.second);
+  }
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v2.pass.cpp
similarity index 82%
rename from third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.pass.cpp
rename to third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v2.pass.cpp
index e2905a4..25c0b9f 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/__murmur2_or_cityhash.abi-v2.pass.cpp
@@ -6,10 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-// Test the CityHash implementation is correct.
-
 // UNSUPPORTED: c++03
 
+// Test that the CityHash implementation is correct.
+//
+// In ABI v1, our CityHash implementation is incorrect and fixing it would
+// be an ABI break.
+// REQUIRES: libcpp-abi-version=2
+
 #include <cassert>
 #include <string>
 #include <utility>
@@ -28,14 +32,14 @@
 };
 
 int main(int, char**) {
-  const std::pair<std::string, uint64_t> TestCases[] = {
+  const std::pair<std::string, std::uint64_t> TestCases[] = {
       {CityHash[0], CHOOSE_BY_ENDIANESS(0x4382a8d0fe8edb17ULL, 0xca84e809bef16fbcULL)},
       {CityHash[1], CHOOSE_BY_ENDIANESS(0xecefb080a6854061ULL, 0xd7feb824250272dcULL)},
       {CityHash[2], CHOOSE_BY_ENDIANESS(0x169ea3aebf908d6dULL, 0xea8cef3ca6f6e368ULL)},
       {CityHash[3], CHOOSE_BY_ENDIANESS(0xe18298a2760f09faULL, 0xf33a7700bb7a94a8ULL)},
   };
 
-  std::__murmur2_or_cityhash<uint64_t> h64;
+  std::__murmur2_or_cityhash<std::uint64_t> h64;
   for (const auto& test_case : TestCases) {
     assert(h64(test_case.first.data(), test_case.first.size()) == test_case.second);
   }
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
index 28884a9..3d260ba 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
index a997435..ffebab0 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
index 4b9160c..dba79a2 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
index 84f11f1..c1d612e 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
index 4e2d787..a2dc58b 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
@@ -22,13 +22,13 @@
 template <class Sequence>
 struct make_variant_imp;
 
-template <size_t ...Indices>
-struct make_variant_imp<std::integer_sequence<size_t, Indices...>> {
-  template <size_t> using AlwaysChar = char;
+template <std::size_t ...Indices>
+struct make_variant_imp<std::integer_sequence<std::size_t, Indices...>> {
+  template <std::size_t> using AlwaysChar = char;
   using type = std::variant<AlwaysChar<Indices>...>;
 };
 
-template <size_t N>
+template <std::size_t N>
 using make_variant_t = typename make_variant_imp<std::make_index_sequence<N>>::type;
 
 constexpr bool ExpectEqual =
diff --git a/third_party/llvm-project/libcxx/test/libcxx/vendor/apple/system-install-properties.sh.cpp b/third_party/llvm-project/libcxx/test/libcxx/vendor/apple/system-install-properties.sh.cpp
index aaa9ad7..e155013 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/vendor/apple/system-install-properties.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/libcxx/vendor/apple/system-install-properties.sh.cpp
@@ -15,9 +15,10 @@
 //
 // RUN: stat "%{include}/__config"
 
-// Make sure we install libc++.1.dylib in the right location.
+// Make sure we install libc++.1.dylib and libc++experimental.a in the right location.
 //
 // RUN: stat "%{lib}/libc++.1.dylib"
+// RUN: stat "%{lib}/libc++experimental.a"
 
 // Make sure we install a symlink from libc++.dylib to libc++.1.dylib.
 //
diff --git a/third_party/llvm-project/libcxx/test/libcxx/vendor/ibm/bad_function_call.pass.cpp b/third_party/llvm-project/libcxx/test/libcxx/vendor/ibm/bad_function_call.pass.cpp
new file mode 100644
index 0000000..2b68446
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/libcxx/vendor/ibm/bad_function_call.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: target={{powerpc.*-ibm-aix.*}}
+// ADDITIONAL_COMPILE_FLAGS: -fvisibility-inlines-hidden
+
+// When there is a weak hidden symbol in user code and a strong definition
+// in the library, we test that the linker relies on the library version,
+// as the default weak resolution semantics don't favour weak local definitions
+// for XCOFF. This creates a conflict on std::bad_function_call, which is used
+// by the std::function template instantiated in main.
+#include <functional>
+#include "test_macros.h"
+#include "assert.h"
+
+void foo() {}
+
+void test_call() {
+  std::function<void()> r(foo);
+  r();
+}
+
+void test_throw() {
+#ifndef TEST_HAS_NO_EXCEPTIONS
+  std::function<int()> f;
+  try {
+    f();
+    assert(false);
+  } catch (const std::bad_function_call&) {
+    return;
+  }
+  assert(false);
+#endif // TEST_HAS_NO_EXCEPTIONS
+}
+
+int main(int, char**) {
+  test_call();
+  test_throw();
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
index 7a5c0a7..bc9c278 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
@@ -100,13 +100,13 @@
 // clang-format on
 
 constexpr bool test() {
-  meta::for_each(meta::forward_iterator_list<int*>{}, []<class Out>() {
+  types::for_each(types::forward_iterator_list<int*>{}, []<class Out>() {
     test_iterators<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
     test_iterators<ProxyIterator<cpp20_input_iterator<int*>>,
                    ProxyIterator<Out>,
                    sentinel_wrapper<ProxyIterator<cpp20_input_iterator<int*>>>>();
 
-    meta::for_each(meta::forward_iterator_list<int*>{}, []<class In>() {
+    types::for_each(types::forward_iterator_list<int*>{}, []<class In>() {
       test_iterators<In, Out>();
       test_iterators<In, Out, sized_sentinel<In>>();
       test_iterators<In, Out, sentinel_wrapper<In>>();
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
index 5b8d8b8..9291c0a 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.segmented.pass.cpp
@@ -7,6 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
 
 #include <algorithm>
 #include <array>
@@ -98,7 +100,7 @@
     test_containers<std::vector<int>, std::vector<int>>();
   }
 
-  meta::for_each(meta::forward_iterator_list<int*>{}, []<class Iter> {
+  types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
     test_join_view<Iter, Iter>();
     test_join_view<Iter, sentinel_wrapper<Iter>>();
     test_join_view<Iter, sized_sentinel<Iter>>();
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.pass.cpp
index 036dfe5..9cad71d 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_backward.pass.cpp
@@ -9,7 +9,8 @@
 // <algorithm>
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
 
 // template<bidirectional_iterator I1, sentinel_for<I1> S1, bidirectional_iterator I2>
 //   requires indirectly_copyable<I1, I2>
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.pass.cpp
index 4a8963e..237d1ef 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy_n.pass.cpp
@@ -23,7 +23,7 @@
 #include "almost_satisfies_types.h"
 #include "test_iterators.h"
 
-template <class In, class Out = In, class Count = size_t>
+template <class In, class Out = In, class Count = std::size_t>
 concept HasCopyNIt = requires(In in, Count count, Out out) { std::ranges::copy_n(in, count, out); };
 
 static_assert(HasCopyNIt<int*>);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
index 6bb7842..7d6770d 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
@@ -22,7 +22,7 @@
 
 #if TEST_STD_VER > 17
 TEST_CONSTEXPR bool test_constexpr() {
-    const size_t N = 5;
+    const std::size_t N = 5;
     int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger than N
 
     auto it = std::fill_n(std::begin(ib), N, 5);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
index 3eb361a..13fd1cb 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
@@ -31,7 +31,7 @@
 
 #if TEST_STD_VER > 17
 TEST_CONSTEXPR bool test_constexpr() {
-    const size_t N = 5;
+    const std::size_t N = 5;
     int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger than N
 
     auto it = std::generate_n(std::begin(ib), N, gen_test());
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate.pass.cpp
index 7cd53dc..56fbe58 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate.pass.cpp
@@ -99,7 +99,7 @@
 static_assert(!HasGenerateRange<InputRangeNotInputOrOutputIterator>);
 static_assert(!HasGenerateRange<R<int*>, IntPtrGen>);
 
-template <class Iter, class Sent, size_t N, class Gen>
+template <class Iter, class Sent, std::size_t N, class Gen>
 constexpr void test_one(const std::array<int, N> input, Gen gen, std::array<int, N> expected) {
   { // (iterator, sentinel) overload.
     auto in = input;
@@ -174,7 +174,7 @@
     { // (iterator, sentinel) overload.
       int gen_invocations = 0;
       auto gen = [&gen_invocations] { ++gen_invocations; return AssignedOnce(); };
-      constexpr size_t N = 10;
+      constexpr std::size_t N = 10;
       std::array<AssignedOnce, N> in;
 
       std::ranges::generate(in.begin(), in.end(), gen);
@@ -185,7 +185,7 @@
     { // (range) overload.
       int gen_invocations = 0;
       auto gen = [&gen_invocations] { ++gen_invocations; return AssignedOnce(); };
-      constexpr size_t N = 10;
+      constexpr std::size_t N = 10;
       std::array<AssignedOnce, N> in;
 
       std::ranges::generate(in, gen);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate_n.pass.cpp
index 6a67832..e6af011 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/ranges_generate_n.pass.cpp
@@ -66,8 +66,8 @@
 // !indirectly_writable<O, invoke_result_t<F&>>
 static_assert(!HasGenerateNIter<int*, IntPtrGen>);
 
-template <class Iter, size_t N, class Gen>
-constexpr void test_one(std::array<int, N> in, size_t n, Gen gen, std::array<int, N> expected) {
+template <class Iter, std::size_t N, class Gen>
+constexpr void test_one(std::array<int, N> in, std::size_t n, Gen gen, std::array<int, N> expected) {
   assert(n <= N);
 
   auto begin = Iter(in.data());
@@ -120,8 +120,8 @@
 
     int gen_invocations = 0;
     auto gen = [&gen_invocations] { ++gen_invocations; return AssignedOnce(); };
-    constexpr size_t N1 = 10;
-    constexpr size_t N2 = N1 / 2;
+    constexpr std::size_t N1 = 10;
+    constexpr std::size_t N2 = N1 / 2;
     std::array<AssignedOnce, N1> in;
 
     auto result = std::ranges::generate_n(in.begin(), N2, gen);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition.pass.cpp
index 6779f78..6d9be04 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition.pass.cpp
@@ -82,8 +82,8 @@
 static_assert(!HasPartitionRange<R<PermutableNotSwappable>, UnaryPred>);
 
 // `partition` isn't a stable algorithm so this function cannot test the exact output.
-template <class Iter, class Sent, size_t N, class Pred>
-constexpr void test_one(std::array<int, N> input, Pred pred, size_t partition_point) {
+template <class Iter, class Sent, std::size_t N, class Pred>
+constexpr void test_one(std::array<int, N> input, Pred pred, std::size_t partition_point) {
   auto neg_pred = [&](int x) { return !pred(x); };
 
   { // (iterator, sentinel) overload.
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_copy.pass.cpp
index ba8a347..7b5b80d 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_copy.pass.cpp
@@ -118,7 +118,7 @@
 static_assert(std::is_same_v<std::ranges::partition_copy_result<int, int, int>,
     std::ranges::in_out_out_result<int, int, int>>);
 
-template <class Iter, class Sent, class OutIter1, class OutIter2, size_t N1, size_t N2, size_t N3, class Pred>
+template <class Iter, class Sent, class OutIter1, class OutIter2, std::size_t N1, size_t N2, size_t N3, class Pred>
 constexpr void test_one(std::array<int, N1> input, Pred pred, std::array<int, N2> expected_true,
     std::array<int, N3> expected_false) {
   static_assert(N2 + N3 == N1);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_point.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_point.pass.cpp
index f9dadc2..932e833 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_point.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_partition_point.pass.cpp
@@ -76,8 +76,8 @@
 static_assert(!HasPartitionPointRange<R<int*>, IndirectUnaryPredicateNotPredicate>);
 static_assert(!HasPartitionPointRange<R<int*>, IndirectUnaryPredicateNotCopyConstructible>);
 
-template <class Iter, class Sent, size_t N, class Pred>
-constexpr void test_one(std::array<int, N> input, Pred pred, size_t partition_point) {
+template <class Iter, class Sent, std::size_t N, class Pred>
+constexpr void test_one(std::array<int, N> input, Pred pred, std::size_t partition_point) {
   assert(std::ranges::is_partitioned(input, pred));
 
   auto begin = Iter(input.data());
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_stable_partition.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_stable_partition.pass.cpp
index b624abc..5c72105 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_stable_partition.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/ranges_stable_partition.pass.cpp
@@ -84,8 +84,8 @@
 static_assert(!HasStablePartitionRange<R<PermutableNotForwardIterator>, UnaryPred>);
 static_assert(!HasStablePartitionRange<R<PermutableNotSwappable>, UnaryPred>);
 
-template <class Iter, class Sent, size_t N, class Pred>
-void test_one(std::array<int, N> input, Pred pred, size_t partition_point, std::array<int, N> expected) {
+template <class Iter, class Sent, std::size_t N, class Pred>
+void test_one(std::array<int, N> input, Pred pred, std::size_t partition_point, std::array<int, N> expected) {
   auto neg_pred = [&](int x) { return !pred(x); };
 
   { // (iterator, sentinel) overload.
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.sample/ranges_sample.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.sample/ranges_sample.pass.cpp
index 0a5d83e..69db960 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.sample/ranges_sample.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.sample/ranges_sample.pass.cpp
@@ -36,10 +36,10 @@
 
 class RandGen {
 public:
-  constexpr static size_t min() { return 0; }
-  constexpr static size_t max() { return 255; }
+  constexpr static std::size_t min() { return 0; }
+  constexpr static std::size_t max() { return 255; }
 
-  constexpr size_t operator()() {
+  constexpr std::size_t operator()() {
     flip = !flip;
     return flip;
   }
@@ -54,9 +54,9 @@
 LIBCPP_STATIC_ASSERT(!std::__libcpp_random_is_valid_urng<RandGen>::value);
 
 struct BadGen {
-  constexpr static size_t min() { return 255; }
-  constexpr static size_t max() { return 0; }
-  constexpr size_t operator()() const;
+  constexpr static std::size_t min() { return 255; }
+  constexpr static std::size_t max() { return 0; }
+  constexpr std::size_t operator()() const;
 };
 static_assert(!std::uniform_random_bit_generator<BadGen>);
 
@@ -148,9 +148,9 @@
 // !uniform_random_bit_generator<remove_reference_t<Gen>>
 static_assert(!HasSampleRange<R<int*>, int*, BadGen>);
 
-template <class Iter, class Sent, class Out, size_t N, class Gen>
-void test_one(std::array<int, N> in, size_t n, Gen gen) {
-  assert(n <= static_cast<size_t>(N));
+template <class Iter, class Sent, class Out, std::size_t N, class Gen>
+void test_one(std::array<int, N> in, std::size_t n, Gen gen) {
+  assert(n <= static_cast<std::size_t>(N));
 
   auto verify_is_subsequence = [&] (auto output) {
     auto sorted_input = in;
@@ -276,18 +276,18 @@
 // generator class has a const or non-const invocation operator (or both).
 void test_generators() {
   struct GenBase {
-    constexpr static size_t min() { return 0; }
-    constexpr static size_t max() { return 255; }
+    constexpr static std::size_t min() { return 0; }
+    constexpr static std::size_t max() { return 255; }
   };
   struct NonconstGen : GenBase {
-    size_t operator()() { return 1; }
+    std::size_t operator()() { return 1; }
   };
   struct ConstGen : GenBase {
-    size_t operator()() const { return 1; }
+    std::size_t operator()() const { return 1; }
   };
   struct ConstAndNonconstGen : GenBase {
-    size_t operator()() { return 1; }
-    size_t operator()() const { return 1; }
+    std::size_t operator()() { return 1; }
+    std::size_t operator()() const { return 1; }
   };
 
   test_generator<ConstGen>();
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/ranges_shuffle.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/ranges_shuffle.pass.cpp
index 6f6be6d..24237b9 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/ranges_shuffle.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/ranges_shuffle.pass.cpp
@@ -34,10 +34,10 @@
 
 class RandGen {
 public:
-  constexpr static size_t min() { return 0; }
-  constexpr static size_t max() { return 255; }
+  constexpr static std::size_t min() { return 0; }
+  constexpr static std::size_t max() { return 255; }
 
-  constexpr size_t operator()() {
+  constexpr std::size_t operator()() {
     flip = !flip;
     return flip;
   }
@@ -52,9 +52,9 @@
 LIBCPP_STATIC_ASSERT(!std::__libcpp_random_is_valid_urng<RandGen>::value);
 
 struct BadGen {
-  constexpr static size_t min() { return 255; }
-  constexpr static size_t max() { return 0; }
-  constexpr size_t operator()() const;
+  constexpr static std::size_t min() { return 255; }
+  constexpr static std::size_t max() { return 0; }
+  constexpr std::size_t operator()() const;
 };
 static_assert(!std::uniform_random_bit_generator<BadGen>);
 
@@ -109,7 +109,7 @@
 // !uniform_random_bit_generator<remove_reference_t<Gen>>
 static_assert(!HasShuffleRange<R<int*>, BadGen>);
 
-template <class Iter, class Sent, size_t N, class Gen>
+template <class Iter, class Sent, std::size_t N, class Gen>
 void test_one(const std::array<int, N> input, Gen gen) {
   { // (iterator, sentinel) overload.
     auto shuffled = input;
@@ -219,18 +219,18 @@
 // generator class has a const or non-const invocation operator (or both).
 void test_generators() {
   struct GenBase {
-    constexpr static size_t min() { return 0; }
-    constexpr static size_t max() { return 255; }
+    constexpr static std::size_t min() { return 0; }
+    constexpr static std::size_t max() { return 255; }
   };
   struct NonconstGen : GenBase {
-    size_t operator()() { return 1; }
+    std::size_t operator()() { return 1; }
   };
   struct ConstGen : GenBase {
-    size_t operator()() const { return 1; }
+    std::size_t operator()() const { return 1; }
   };
   struct ConstAndNonconstGen : GenBase {
-    size_t operator()() { return 1; }
-    size_t operator()() const { return 1; }
+    std::size_t operator()() { return 1; }
+    std::size_t operator()() const { return 1; }
   };
 
   test_generator<ConstGen>();
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/ranges.reverse.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/ranges.reverse.pass.cpp
index fbeb8a4..c1011f3 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/ranges.reverse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.reverse/ranges.reverse.pass.cpp
@@ -45,7 +45,7 @@
 static_assert(!HasReverseR<PermutableRangeNotForwardIterator>);
 static_assert(!HasReverseR<PermutableRangeNotSwappable>);
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test(std::array<int, N> value, std::array<int, N> expected) {
   {
     auto val = value;
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges.rotate_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges.rotate_copy.pass.cpp
index b41ff4e..1f18d78 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges.rotate_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges.rotate_copy.pass.cpp
@@ -51,7 +51,7 @@
 static_assert(std::is_same_v<std::ranges::rotate_copy_result<int, int>, std::ranges::in_out_result<int, int>>);
 
 template <class Iter, class OutIter, class Sent, int N>
-constexpr void test(std::array<int, N> value, size_t middle, std::array<int, N> expected) {
+constexpr void test(std::array<int, N> value, std::size_t middle, std::array<int, N> expected) {
   {
     std::array<int, N> out;
     std::same_as<std::ranges::in_out_result<Iter, OutIter>> decltype(auto) ret =
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges_rotate.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges_rotate.pass.cpp
index c34dac1..1506ce7 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges_rotate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/ranges_rotate.pass.cpp
@@ -68,8 +68,8 @@
 static_assert(!HasRotateRange<PermutableRangeNotForwardIterator>);
 static_assert(!HasRotateRange<PermutableRangeNotSwappable>);
 
-template <class Iter, class Sent, size_t N>
-constexpr void test_one(const std::array<int, N> input, size_t mid_index, std::array<int, N> expected) {
+template <class Iter, class Sent, std::size_t N>
+constexpr void test_one(const std::array<int, N> input, std::size_t mid_index, std::array<int, N> expected) {
   assert(mid_index <= N);
 
   { // (iterator, sentinel) overload.
@@ -159,7 +159,7 @@
       auto begin = adl::Iterator::TrackSwaps(in.data(), swaps);
       auto end = adl::Iterator::TrackSwaps(in.data() + in.size(), swaps);
 
-      for (size_t mid = 0; mid != input.size(); ++mid) {
+      for (std::size_t mid = 0; mid != input.size(); ++mid) {
         std::ranges::rotate(begin, begin + mid, end);
         assert(swaps <= expected);
       }
@@ -172,7 +172,7 @@
       auto end = adl::Iterator::TrackSwaps(in.data() + in.size(), swaps);
       auto range = std::ranges::subrange(begin, end);
 
-      for (size_t mid = 0; mid != input.size(); ++mid) {
+      for (std::size_t mid = 0; mid != input.size(); ++mid) {
         std::ranges::rotate(range, begin + mid);
         assert(swaps <= expected);
       }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
index cba0d3b..c19f44a 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
@@ -115,7 +115,7 @@
     int const n_ints = sizeof(ints)/sizeof(int);
     int zeros[n_ints] = {0};
 
-    const size_t N = 2;
+    const std::size_t N = 2;
     const auto middle = std::begin(ints) + N;
     auto it = std::rotate_copy(std::begin(ints), middle, std::end(ints), std::begin(zeros));
     assert(std::distance(std::begin(zeros), it) == n_ints);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.iterator.pass.cpp
new file mode 100644
index 0000000..9420902
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.iterator.pass.cpp
@@ -0,0 +1,227 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <algorithm>
+
+// template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2,
+//          weakly_incrementable O, copy_constructible F, class Proj1 = identity,
+//          class Proj2 = identity>
+//   requires indirectly_writable<O, indirect_result_t<F&, projected<I1, Proj1>,
+//                                          projected<I2, Proj2>>>
+//   constexpr ranges::binary_transform_result<I1, I2, O>
+//     ranges::transform(I1 first1, S1 last1, I2 first2, S2 last2, O result,
+//                       F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});
+
+// The range overloads are tested in ranges.tranform.binary.range.pass.cpp.
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <functional>
+#include <ranges>
+
+#include "test_iterators.h"
+#include "almost_satisfies_types.h"
+
+struct BinaryFunc {
+  int operator()(int, int);
+};
+
+template <class It, class Sent = It>
+concept HasTransformIt =
+    requires(It it, Sent sent, int* out) { std::ranges::transform(it, sent, it, sent, out, BinaryFunc{}); };
+static_assert(HasTransformIt<int*>);
+static_assert(!HasTransformIt<InputIteratorNotDerivedFrom>);
+static_assert(!HasTransformIt<InputIteratorNotIndirectlyReadable>);
+static_assert(!HasTransformIt<InputIteratorNotInputOrOutputIterator>);
+static_assert(!HasTransformIt<cpp20_input_iterator<int*>, SentinelForNotSemiregular>);
+static_assert(!HasTransformIt<cpp20_input_iterator<int*>, InputRangeNotSentinelEqualityComparableWith>);
+
+template <class It>
+concept HasTransformOut = requires(int* it, int* sent, It out, std::array<int, 2> range) {
+  std::ranges::transform(it, sent, it, sent, out, BinaryFunc{});
+};
+static_assert(HasTransformOut<int*>);
+static_assert(!HasTransformOut<WeaklyIncrementableNotMovable>);
+
+// check indirectly_readable
+static_assert(HasTransformOut<char*>);
+static_assert(!HasTransformOut<int**>);
+
+struct MoveOnlyFunctor {
+  MoveOnlyFunctor(const MoveOnlyFunctor&) = delete;
+  MoveOnlyFunctor(MoveOnlyFunctor&&)      = default;
+  int operator()(int, int);
+};
+
+template <class Func>
+concept HasTransformFuncBinary = requires(int* it, int* sent, int* out, std::array<int, 2> range, Func func) {
+  std::ranges::transform(it, sent, it, sent, out, func);
+};
+static_assert(HasTransformFuncBinary<BinaryFunc>);
+static_assert(!HasTransformFuncBinary<MoveOnlyFunctor>);
+
+static_assert(std::is_same_v<std::ranges::binary_transform_result<int, long, char>,
+                             std::ranges::in_in_out_result<int, long, char>>);
+
+// clang-format off
+template <class In1, class In2, class Out, class Sent1, class Sent2>
+constexpr bool test_iterators() {
+  { // simple
+    int a[] = {1, 2, 3, 4, 5};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    std::same_as<std::ranges::in_in_out_result<In1, In2, Out>> decltype(auto) ret = std::ranges::transform(
+        In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
+
+    assert((std::to_array(c) == std::array{6, 6, 6, 6, 6}));
+    assert(base(ret.in1) == a + 5);
+    assert(base(ret.in2) == b + 5);
+    assert(base(ret.out) == c + 5);
+  }
+
+  { // first range empty
+    int a[] = {};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    auto ret = std::ranges::transform(
+        In1(a), Sent1(In1(a)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // second range empty
+    int a[] = {5, 4, 3, 2, 1};
+    int b[] = {};
+    int c[5];
+
+    auto ret = std::ranges::transform(
+        In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b)), Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // both ranges empty
+    int a[] = {};
+    int b[] = {};
+    int c[5];
+
+    auto ret = std::ranges::transform(
+        In1(a), Sent1(In1(a)), In2(b), Sent2(In2(b)), Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // first range one element
+    int a[] = {2};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    auto ret = std::ranges::transform(
+        In1(a), Sent1(In1(a + 1)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
+
+    assert(c[0] == 7);
+    assert(base(ret.in1) == a + 1);
+    assert(base(ret.in2) == b + 1);
+    assert(base(ret.out) == c + 1);
+  }
+
+  { // second range contains one element
+    int a[] = {5, 4, 3, 2, 1};
+    int b[] = {4};
+    int c[5];
+
+    auto ret = std::ranges::transform(
+        In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b + 1)), Out(c), [](int i, int j) { return i + j; });
+
+    assert(c[0] == 9);
+    assert(base(ret.in1) == a + 1);
+    assert(base(ret.in2) == b + 1);
+    assert(base(ret.out) == c + 1);
+  }
+
+  { // check that the transform function and projection call counts are correct
+    int predCount = 0;
+    int proj1Count = 0;
+    int proj2Count = 0;
+    auto pred = [&](int, int) { ++predCount; return 1; };
+    auto proj1 = [&](int) { ++proj1Count; return 0; };
+    auto proj2 = [&](int) { ++proj2Count; return 0; };
+    int a[] = {1, 2, 3, 4};
+    int b[] = {1, 2, 3, 4};
+    std::array<int, 4> c;
+    std::ranges::transform(In1(a), Sent1(In1(a + 4)), In2(b), Sent2(In2(b + 4)), Out(c.data()), pred, proj1, proj2);
+    assert(predCount == 4);
+    assert(proj1Count == 4);
+    assert(proj2Count == 4);
+    assert((c == std::array{1, 1, 1, 1}));
+  }
+
+  return true;
+}
+// clang-format on
+
+template <class In2, class Out, class Sent2 = In2>
+constexpr void test_iterator_in1() {
+  test_iterators<cpp17_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp17_input_iterator<int*>>, Sent2>();
+  test_iterators<cpp20_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp20_input_iterator<int*>>, Sent2>();
+  test_iterators<forward_iterator<int*>, In2, Out, forward_iterator<int*>, Sent2>();
+  test_iterators<bidirectional_iterator<int*>, In2, Out, bidirectional_iterator<int*>, Sent2>();
+  test_iterators<random_access_iterator<int*>, In2, Out, random_access_iterator<int*>, Sent2>();
+  test_iterators<contiguous_iterator<int*>, In2, Out, contiguous_iterator<int*>, Sent2>();
+  test_iterators<int*, In2, Out, int*, Sent2>();
+}
+
+template <class Out>
+constexpr void test_iterators_in1_in2() {
+  test_iterator_in1<cpp17_input_iterator<int*>, Out, sentinel_wrapper<cpp17_input_iterator<int*>>>();
+  test_iterator_in1<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+  test_iterator_in1<forward_iterator<int*>, Out>();
+  test_iterator_in1<bidirectional_iterator<int*>, Out>();
+  test_iterator_in1<random_access_iterator<int*>, Out>();
+  test_iterator_in1<contiguous_iterator<int*>, Out>();
+  test_iterator_in1<int*, Out>();
+}
+
+constexpr bool test() {
+  test_iterators_in1_in2<cpp17_output_iterator<int*>>();
+  test_iterators_in1_in2<cpp20_output_iterator<int*>>();
+  test_iterators_in1_in2<forward_iterator<int*>>();
+  test_iterators_in1_in2<bidirectional_iterator<int*>>();
+  test_iterators_in1_in2<random_access_iterator<int*>>();
+  test_iterators_in1_in2<contiguous_iterator<int*>>();
+  test_iterators_in1_in2<int*>();
+
+  { // check that returning another type from the projection works
+    struct S { int i; int other; };
+    S a[] = { S{0, 0}, S{1, 0}, S{3, 0}, S{10, 0} };
+    S b[] = { S{0, 10}, S{1, 20}, S{3, 30}, S{10, 40} };
+    std::array<int, 4> c;
+    std::ranges::transform(a, a + 4, b, b + 4, c.begin(), [](S s1, S s2) { return s1.i + s2.other; });
+    assert((c == std::array{10, 21, 33, 50}));
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.pass.cpp
deleted file mode 100644
index 3031646..0000000
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.pass.cpp
+++ /dev/null
@@ -1,426 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11, c++14, c++17
-
-// <algorithm>
-
-// template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2,
-//          weakly_incrementable O, copy_constructible F, class Proj1 = identity,
-//          class Proj2 = identity>
-//   requires indirectly_writable<O, indirect_result_t<F&, projected<I1, Proj1>,
-//                                          projected<I2, Proj2>>>
-//   constexpr ranges::binary_transform_result<I1, I2, O>
-//     ranges::transform(I1 first1, S1 last1, I2 first2, S2 last2, O result,
-//                       F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});
-// template<input_range R1, input_range R2, weakly_incrementable O,
-//          copy_constructible F, class Proj1 = identity, class Proj2 = identity>
-//   requires indirectly_writable<O, indirect_result_t<F&, projected<iterator_t<R1>, Proj1>,
-//                                          projected<iterator_t<R2>, Proj2>>>
-//   constexpr ranges::binary_transform_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>, O>
-//     ranges::transform(R1&& r1, R2&& r2, O result,
-//                       F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});
-
-#include <algorithm>
-#include <array>
-#include <cassert>
-#include <functional>
-#include <ranges>
-
-#include "test_iterators.h"
-#include "almost_satisfies_types.h"
-
-struct BinaryFunc {
-  int operator()(int, int);
-};
-
-template <class Range>
-concept HasTranformR = requires(Range r, int* out) { std::ranges::transform(r, r, out, BinaryFunc{}); };
-
-static_assert(HasTranformR<std::array<int, 1>>);
-static_assert(!HasTranformR<int>);
-static_assert(!HasTranformR<InputRangeNotDerivedFrom>);
-static_assert(!HasTranformR<InputRangeNotIndirectlyReadable>);
-static_assert(!HasTranformR<InputRangeNotInputOrOutputIterator>);
-static_assert(!HasTranformR<InputRangeNotSentinelSemiregular>);
-static_assert(!HasTranformR<InputRangeNotSentinelEqualityComparableWith>);
-
-template <class It, class Sent = It>
-concept HasTransformIt =
-    requires(It it, Sent sent, int* out) { std::ranges::transform(it, sent, it, sent, out, BinaryFunc{}); };
-static_assert(HasTransformIt<int*>);
-static_assert(!HasTransformIt<InputIteratorNotDerivedFrom>);
-static_assert(!HasTransformIt<InputIteratorNotIndirectlyReadable>);
-static_assert(!HasTransformIt<InputIteratorNotInputOrOutputIterator>);
-static_assert(!HasTransformIt<cpp20_input_iterator<int*>, SentinelForNotSemiregular>);
-static_assert(!HasTransformIt<cpp20_input_iterator<int*>, InputRangeNotSentinelEqualityComparableWith>);
-
-template <class It>
-concept HasTransformOut = requires(int* it, int* sent, It out, std::array<int, 2> range) {
-  std::ranges::transform(it, sent, it, sent, out, BinaryFunc{});
-  std::ranges::transform(range, range, out, BinaryFunc{});
-};
-static_assert(HasTransformOut<int*>);
-static_assert(!HasTransformOut<WeaklyIncrementableNotMovable>);
-
-// check indirectly_readable
-static_assert(HasTransformOut<char*>);
-static_assert(!HasTransformOut<int**>);
-
-struct MoveOnlyFunctor {
-  MoveOnlyFunctor(const MoveOnlyFunctor&) = delete;
-  MoveOnlyFunctor(MoveOnlyFunctor&&)      = default;
-  int operator()(int, int);
-};
-
-template <class Func>
-concept HasTransformFuncBinary = requires(int* it, int* sent, int* out, std::array<int, 2> range, Func func) {
-  std::ranges::transform(it, sent, it, sent, out, func);
-  std::ranges::transform(range, range, out, func);
-};
-static_assert(HasTransformFuncBinary<BinaryFunc>);
-static_assert(!HasTransformFuncBinary<MoveOnlyFunctor>);
-
-static_assert(std::is_same_v<std::ranges::binary_transform_result<int, long, char>,
-                             std::ranges::in_in_out_result<int, long, char>>);
-
-// clang-format off
-template <class In1, class In2, class Out, class Sent1, class Sent2>
-constexpr bool test_iterators() {
-  { // simple
-    {
-      int a[] = {1, 2, 3, 4, 5};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      std::same_as<std::ranges::in_in_out_result<In1, In2, Out>> decltype(auto) ret = std::ranges::transform(
-          In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
-
-      assert((std::to_array(c) == std::array{6, 6, 6, 6, 6}));
-      assert(base(ret.in1) == a + 5);
-      assert(base(ret.in2) == b + 5);
-      assert(base(ret.out) == c + 5);
-    }
-
-    {
-      int a[] = {1, 2, 3, 4, 5};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
-
-      std::same_as<std::ranges::in_in_out_result<In1, In2, Out>> decltype(auto) ret = std::ranges::transform(
-          range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert((std::to_array(c) == std::array{6, 6, 6, 6, 6}));
-      assert(base(ret.in1) == a + 5);
-      assert(base(ret.in2) == b + 5);
-      assert(base(ret.out) == c + 5);
-    }
-  }
-
-  { // first range empty
-    {
-      int a[] = {};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      auto ret = std::ranges::transform(
-          In1(a), Sent1(In1(a)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-
-    {
-      int a[] = {};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
-
-      auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-  }
-
-  { // second range empty
-    {
-      int a[] = {5, 4, 3, 2, 1};
-      int b[] = {};
-      int c[5];
-
-      auto ret = std::ranges::transform(
-          In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b)), Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-
-    {
-      int a[] = {5, 4, 3, 2, 1};
-      int b[] = {};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b)));
-
-      auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-  }
-
-  { // both ranges empty
-    {
-      int a[] = {};
-      int b[] = {};
-      int c[5];
-
-      auto ret = std::ranges::transform(
-          In1(a), Sent1(In1(a)), In2(b), Sent2(In2(b)), Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-
-    {
-      int a[] = {};
-      int b[] = {};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b)));
-
-      auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert(base(ret.in1) == a);
-      assert(base(ret.in2) == b);
-      assert(base(ret.out) == c);
-    }
-  }
-
-  { // first range one element
-    {
-      int a[] = {2};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      auto ret = std::ranges::transform(
-          In1(a), Sent1(In1(a + 1)), In2(b), Sent2(In2(b + 5)), Out(c), [](int i, int j) { return i + j; });
-
-      assert(c[0] == 7);
-      assert(base(ret.in1) == a + 1);
-      assert(base(ret.in2) == b + 1);
-      assert(base(ret.out) == c + 1);
-    }
-
-    {
-      int a[] = {2};
-      int b[] = {5, 4, 3, 2, 1};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 1)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
-
-      auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert(c[0] == 7);
-      assert(base(ret.in1) == a + 1);
-      assert(base(ret.in2) == b + 1);
-      assert(base(ret.out) == c + 1);
-    }
-  }
-
-  { // second range contains one element
-    {
-      int a[] = {5, 4, 3, 2, 1};
-      int b[] = {4};
-      int c[5];
-
-      auto ret = std::ranges::transform(
-          In1(a), Sent1(In1(a + 5)), In2(b), Sent2(In2(b + 1)), Out(c), [](int i, int j) { return i + j; });
-
-      assert(c[0] == 9);
-      assert(base(ret.in1) == a + 1);
-      assert(base(ret.in2) == b + 1);
-      assert(base(ret.out) == c + 1);
-    }
-
-    {
-      int a[] = {5, 4, 3, 2, 1};
-      int b[] = {4};
-      int c[5];
-
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 1)));
-
-      auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
-
-      assert(c[0] == 9);
-      assert(base(ret.in1) == a + 1);
-      assert(base(ret.in2) == b + 1);
-      assert(base(ret.out) == c + 1);
-    }
-  }
-
-  { // check that the transform function and projection call counts are correct
-    {
-      int predCount = 0;
-      int proj1Count = 0;
-      int proj2Count = 0;
-      auto pred = [&](int, int) { ++predCount; return 1; };
-      auto proj1 = [&](int) { ++proj1Count; return 0; };
-      auto proj2 = [&](int) { ++proj2Count; return 0; };
-      int a[] = {1, 2, 3, 4};
-      int b[] = {1, 2, 3, 4};
-      std::array<int, 4> c;
-      std::ranges::transform(In1(a), Sent1(In1(a + 4)), In2(b), Sent2(In2(b + 4)), Out(c.data()), pred, proj1, proj2);
-      assert(predCount == 4);
-      assert(proj1Count == 4);
-      assert(proj2Count == 4);
-      assert((c == std::array{1, 1, 1, 1}));
-    }
-    {
-      int predCount = 0;
-      int proj1Count = 0;
-      int proj2Count = 0;
-      auto pred = [&](int, int) { ++predCount; return 1; };
-      auto proj1 = [&](int) { ++proj1Count; return 0; };
-      auto proj2 = [&](int) { ++proj2Count; return 0; };
-      int a[] = {1, 2, 3, 4};
-      int b[] = {1, 2, 3, 4};
-      std::array<int, 4> c;
-      auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 4)));
-      auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 4)));
-      std::ranges::transform(range1, range2, Out(c.data()), pred, proj1, proj2);
-      assert(predCount == 4);
-      assert(proj1Count == 4);
-      assert(proj2Count == 4);
-      assert((c == std::array{1, 1, 1, 1}));
-    }
-  }
-
-  return true;
-}
-// clang-format on
-
-template <class In2, class Out, class Sent2 = In2>
-constexpr void test_iterator_in1() {
-  test_iterators<cpp17_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp17_input_iterator<int*>>, Sent2>();
-  test_iterators<cpp20_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp20_input_iterator<int*>>, Sent2>();
-  test_iterators<forward_iterator<int*>, In2, Out, forward_iterator<int*>, Sent2>();
-  test_iterators<bidirectional_iterator<int*>, In2, Out, bidirectional_iterator<int*>, Sent2>();
-  test_iterators<random_access_iterator<int*>, In2, Out, random_access_iterator<int*>, Sent2>();
-  test_iterators<contiguous_iterator<int*>, In2, Out, contiguous_iterator<int*>, Sent2>();
-  test_iterators<int*, In2, Out, int*, Sent2>();
-  // static_asserting here to avoid hitting the constant evaluation step limit
-  static_assert(test_iterators<cpp17_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp17_input_iterator<int*>>, Sent2>());
-  static_assert(test_iterators<cpp20_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp20_input_iterator<int*>>, Sent2>());
-  static_assert(test_iterators<forward_iterator<int*>, In2, Out, forward_iterator<int*>, Sent2>());
-  static_assert(test_iterators<bidirectional_iterator<int*>, In2, Out, bidirectional_iterator<int*>, Sent2>());
-  static_assert(test_iterators<random_access_iterator<int*>, In2, Out, random_access_iterator<int*>, Sent2>());
-  static_assert(test_iterators<contiguous_iterator<int*>, In2, Out, contiguous_iterator<int*>, Sent2>());
-  static_assert(test_iterators<int*, In2, Out, int*, Sent2>());
-}
-
-template <class Out>
-void test_iterators_in1_in2() {
-  test_iterator_in1<cpp17_input_iterator<int*>, Out, sentinel_wrapper<cpp17_input_iterator<int*>>>();
-  test_iterator_in1<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
-  test_iterator_in1<forward_iterator<int*>, Out>();
-  test_iterator_in1<bidirectional_iterator<int*>, Out>();
-  test_iterator_in1<random_access_iterator<int*>, Out>();
-  test_iterator_in1<contiguous_iterator<int*>, Out>();
-  test_iterator_in1<int*, Out>();
-}
-
-constexpr bool test() {
-  { // check that std::ranges::dangling is returned properly
-    {
-      int b[] = {2, 5, 4, 3, 1};
-      std::array<int, 5> c;
-      std::same_as<std::ranges::in_in_out_result<std::ranges::dangling, int*, int*>> auto ret =
-          std::ranges::transform(std::array{1, 2, 3, 5, 4}, b, c.data(), [](int i, int j) { return i * j; });
-      assert((c == std::array{2, 10, 12, 15, 4}));
-      assert(ret.in2 == b + 5);
-      assert(ret.out == c.data() + c.size());
-    }
-    {
-      int a[] = {2, 5, 4, 3, 1, 4, 5, 6};
-      std::array<int, 8> c;
-      std::same_as<std::ranges::in_in_out_result<int*, std::ranges::dangling, int*>> auto ret =
-          std::ranges::transform(a, std::array{1, 2, 3, 5, 4, 5, 6, 7}, c.data(), [](int i, int j) { return i * j; });
-      assert((c == std::array{2, 10, 12, 15, 4, 20, 30, 42}));
-      assert(ret.in1 == a + 8);
-      assert(ret.out == c.data() + c.size());
-    }
-    {
-      std::array<int, 3> c;
-      std::same_as<std::ranges::in_in_out_result<std::ranges::dangling, std::ranges::dangling, int*>> auto ret =
-          std::ranges::transform(std::array{4, 4, 4}, std::array{4, 4, 4}, c.data(), [](int i, int j) { return i * j; });
-      assert((c == std::array{16, 16, 16}));
-      assert(ret.out == c.data() + c.size());
-    }
-  }
-
-  { // check that returning another type from the projection works
-    {
-      struct S { int i; int other; };
-      S a[] = { S{0, 0}, S{1, 0}, S{3, 0}, S{10, 0} };
-      S b[] = { S{0, 10}, S{1, 20}, S{3, 30}, S{10, 40} };
-      std::array<int, 4> c;
-      std::ranges::transform(a, a + 4, b, b + 4, c.begin(), [](S s1, S s2) { return s1.i + s2.other; });
-      assert((c == std::array{10, 21, 33, 50}));
-    }
-    {
-      struct S { int i; int other; };
-      S a[] = { S{0, 0}, S{1, 0}, S{3, 0}, S{10, 0} };
-      S b[] = { S{0, 10}, S{1, 20}, S{3, 30}, S{10, 40} };
-      std::array<int, 4> c;
-      std::ranges::transform(a, b, c.begin(), [](S s1, S s2) { return s1.i + s2.other; });
-      assert((c == std::array{10, 21, 33, 50}));
-    }
-  }
-
-  { // check that std::invoke is used
-    struct S { int i; };
-    S a[] = { S{1}, S{3}, S{2} };
-    S b[] = { S{2}, S{5}, S{3} };
-    std::array<int, 3> c;
-    auto ret = std::ranges::transform(a, b, c.data(), [](int i, int j) { return i + j + 2; }, &S::i, &S::i);
-    assert((c == std::array{5, 10, 7}));
-    assert(ret.out == c.data() + 3);
-  }
-
-  return true;
-}
-
-int main(int, char**) {
-  test_iterators_in1_in2<cpp17_output_iterator<int*>>();
-  test_iterators_in1_in2<cpp20_output_iterator<int*>>();
-  test_iterators_in1_in2<forward_iterator<int*>>();
-  test_iterators_in1_in2<bidirectional_iterator<int*>>();
-  test_iterators_in1_in2<random_access_iterator<int*>>();
-  test_iterators_in1_in2<contiguous_iterator<int*>>();
-  test_iterators_in1_in2<int*>();
-  test();
-  static_assert(test());
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.range.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.range.pass.cpp
new file mode 100644
index 0000000..bebe456
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.binary.range.pass.cpp
@@ -0,0 +1,288 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <algorithm>
+
+// template<input_range R1, input_range R2, weakly_incrementable O,
+//          copy_constructible F, class Proj1 = identity, class Proj2 = identity>
+//   requires indirectly_writable<O, indirect_result_t<F&, projected<iterator_t<R1>, Proj1>,
+//                                          projected<iterator_t<R2>, Proj2>>>
+//   constexpr ranges::binary_transform_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>, O>
+//     ranges::transform(R1&& r1, R2&& r2, O result,
+//                       F binary_op, Proj1 proj1 = {}, Proj2 proj2 = {});
+
+// The iterator overloads are tested in ranges.tranform.binary.iterator.pass.cpp.
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <functional>
+#include <ranges>
+
+#include "test_iterators.h"
+#include "almost_satisfies_types.h"
+
+struct BinaryFunc {
+  int operator()(int, int);
+};
+
+template <class Range>
+concept HasTranformR = requires(Range r, int* out) { std::ranges::transform(r, r, out, BinaryFunc{}); };
+
+static_assert(HasTranformR<std::array<int, 1>>);
+static_assert(!HasTranformR<int>);
+static_assert(!HasTranformR<InputRangeNotDerivedFrom>);
+static_assert(!HasTranformR<InputRangeNotIndirectlyReadable>);
+static_assert(!HasTranformR<InputRangeNotInputOrOutputIterator>);
+static_assert(!HasTranformR<InputRangeNotSentinelSemiregular>);
+static_assert(!HasTranformR<InputRangeNotSentinelEqualityComparableWith>);
+
+template <class It>
+concept HasTransformOut = requires(int* it, int* sent, It out, std::array<int, 2> range) {
+  std::ranges::transform(range, range, out, BinaryFunc{});
+};
+static_assert(HasTransformOut<int*>);
+static_assert(!HasTransformOut<WeaklyIncrementableNotMovable>);
+
+// check indirectly_readable
+static_assert(HasTransformOut<char*>);
+static_assert(!HasTransformOut<int**>);
+
+struct MoveOnlyFunctor {
+  MoveOnlyFunctor(const MoveOnlyFunctor&) = delete;
+  MoveOnlyFunctor(MoveOnlyFunctor&&)      = default;
+  int operator()(int, int);
+};
+
+template <class Func>
+concept HasTransformFuncBinary = requires(int* it, int* sent, int* out, std::array<int, 2> range, Func func) {
+  std::ranges::transform(range, range, out, func);
+};
+static_assert(HasTransformFuncBinary<BinaryFunc>);
+static_assert(!HasTransformFuncBinary<MoveOnlyFunctor>);
+
+static_assert(std::is_same_v<std::ranges::binary_transform_result<int, long, char>,
+                             std::ranges::in_in_out_result<int, long, char>>);
+
+// clang-format off
+template <class In1, class In2, class Out, class Sent1, class Sent2>
+constexpr bool test_iterators() {
+  { // simple
+    int a[] = {1, 2, 3, 4, 5};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
+
+    std::same_as<std::ranges::in_in_out_result<In1, In2, Out>> decltype(auto) ret = std::ranges::transform(
+        range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert((std::to_array(c) == std::array{6, 6, 6, 6, 6}));
+    assert(base(ret.in1) == a + 5);
+    assert(base(ret.in2) == b + 5);
+    assert(base(ret.out) == c + 5);
+  }
+
+  { // first range empty
+    int a[] = {};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
+
+    auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // second range empty
+    int a[] = {5, 4, 3, 2, 1};
+    int b[] = {};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b)));
+
+    auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // both ranges empty
+    int a[] = {};
+    int b[] = {};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b)));
+
+    auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert(base(ret.in1) == a);
+    assert(base(ret.in2) == b);
+    assert(base(ret.out) == c);
+  }
+
+  { // first range one element
+    int a[] = {2};
+    int b[] = {5, 4, 3, 2, 1};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 1)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 5)));
+
+    auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert(c[0] == 7);
+    assert(base(ret.in1) == a + 1);
+    assert(base(ret.in2) == b + 1);
+    assert(base(ret.out) == c + 1);
+  }
+
+  { // second range contains one element
+    int a[] = {5, 4, 3, 2, 1};
+    int b[] = {4};
+    int c[5];
+
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 5)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 1)));
+
+    auto ret = std::ranges::transform(range1, range2, Out(c), [](int i, int j) { return i + j; });
+
+    assert(c[0] == 9);
+    assert(base(ret.in1) == a + 1);
+    assert(base(ret.in2) == b + 1);
+    assert(base(ret.out) == c + 1);
+  }
+
+  { // check that the transform function and projection call counts are correct
+    int predCount = 0;
+    int proj1Count = 0;
+    int proj2Count = 0;
+    auto pred = [&](int, int) { ++predCount; return 1; };
+    auto proj1 = [&](int) { ++proj1Count; return 0; };
+    auto proj2 = [&](int) { ++proj2Count; return 0; };
+    int a[] = {1, 2, 3, 4};
+    int b[] = {1, 2, 3, 4};
+    std::array<int, 4> c;
+    auto range1 = std::ranges::subrange(In1(a), Sent1(In1(a + 4)));
+    auto range2 = std::ranges::subrange(In2(b), Sent2(In2(b + 4)));
+    std::ranges::transform(range1, range2, Out(c.data()), pred, proj1, proj2);
+    assert(predCount == 4);
+    assert(proj1Count == 4);
+    assert(proj2Count == 4);
+    assert((c == std::array{1, 1, 1, 1}));
+  }
+
+  return true;
+}
+// clang-format on
+
+template <class In2, class Out, class Sent2 = In2>
+constexpr void test_iterator_in1() {
+  test_iterators<cpp17_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp17_input_iterator<int*>>, Sent2>();
+  test_iterators<cpp20_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp20_input_iterator<int*>>, Sent2>();
+  test_iterators<forward_iterator<int*>, In2, Out, forward_iterator<int*>, Sent2>();
+  test_iterators<bidirectional_iterator<int*>, In2, Out, bidirectional_iterator<int*>, Sent2>();
+  test_iterators<random_access_iterator<int*>, In2, Out, random_access_iterator<int*>, Sent2>();
+  test_iterators<contiguous_iterator<int*>, In2, Out, contiguous_iterator<int*>, Sent2>();
+  test_iterators<int*, In2, Out, int*, Sent2>();
+  // static_asserting here to avoid hitting the constant evaluation step limit
+  static_assert(test_iterators<cpp17_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp17_input_iterator<int*>>, Sent2>());
+  static_assert(test_iterators<cpp20_input_iterator<int*>, In2, Out, sentinel_wrapper<cpp20_input_iterator<int*>>, Sent2>());
+  static_assert(test_iterators<forward_iterator<int*>, In2, Out, forward_iterator<int*>, Sent2>());
+  static_assert(test_iterators<bidirectional_iterator<int*>, In2, Out, bidirectional_iterator<int*>, Sent2>());
+  static_assert(test_iterators<random_access_iterator<int*>, In2, Out, random_access_iterator<int*>, Sent2>());
+  static_assert(test_iterators<contiguous_iterator<int*>, In2, Out, contiguous_iterator<int*>, Sent2>());
+  static_assert(test_iterators<int*, In2, Out, int*, Sent2>());
+}
+
+template <class Out>
+constexpr void test_iterators_in1_in2() {
+  test_iterator_in1<cpp17_input_iterator<int*>, Out, sentinel_wrapper<cpp17_input_iterator<int*>>>();
+  test_iterator_in1<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+  test_iterator_in1<forward_iterator<int*>, Out>();
+  test_iterator_in1<bidirectional_iterator<int*>, Out>();
+  test_iterator_in1<random_access_iterator<int*>, Out>();
+  test_iterator_in1<contiguous_iterator<int*>, Out>();
+  test_iterator_in1<int*, Out>();
+}
+
+constexpr bool test() {
+  test_iterators_in1_in2<cpp17_output_iterator<int*>>();
+  test_iterators_in1_in2<cpp20_output_iterator<int*>>();
+  test_iterators_in1_in2<forward_iterator<int*>>();
+  test_iterators_in1_in2<bidirectional_iterator<int*>>();
+  test_iterators_in1_in2<random_access_iterator<int*>>();
+  test_iterators_in1_in2<contiguous_iterator<int*>>();
+  test_iterators_in1_in2<int*>();
+
+  { // check that std::ranges::dangling is returned properly
+    {
+      int b[] = {2, 5, 4, 3, 1};
+      std::array<int, 5> c;
+      std::same_as<std::ranges::in_in_out_result<std::ranges::dangling, int*, int*>> auto ret =
+          std::ranges::transform(std::array{1, 2, 3, 5, 4}, b, c.data(), [](int i, int j) { return i * j; });
+      assert((c == std::array{2, 10, 12, 15, 4}));
+      assert(ret.in2 == b + 5);
+      assert(ret.out == c.data() + c.size());
+    }
+    {
+      int a[] = {2, 5, 4, 3, 1, 4, 5, 6};
+      std::array<int, 8> c;
+      std::same_as<std::ranges::in_in_out_result<int*, std::ranges::dangling, int*>> auto ret =
+          std::ranges::transform(a, std::array{1, 2, 3, 5, 4, 5, 6, 7}, c.data(), [](int i, int j) { return i * j; });
+      assert((c == std::array{2, 10, 12, 15, 4, 20, 30, 42}));
+      assert(ret.in1 == a + 8);
+      assert(ret.out == c.data() + c.size());
+    }
+    {
+      std::array<int, 3> c;
+      std::same_as<std::ranges::in_in_out_result<std::ranges::dangling, std::ranges::dangling, int*>> auto ret =
+          std::ranges::transform(std::array{4, 4, 4}, std::array{4, 4, 4}, c.data(), [](int i, int j) { return i * j; });
+      assert((c == std::array{16, 16, 16}));
+      assert(ret.out == c.data() + c.size());
+    }
+  }
+
+  { // check that returning another type from the projection works
+    struct S { int i; int other; };
+    S a[] = { S{0, 0}, S{1, 0}, S{3, 0}, S{10, 0} };
+    S b[] = { S{0, 10}, S{1, 20}, S{3, 30}, S{10, 40} };
+    std::array<int, 4> c;
+    std::ranges::transform(a, b, c.begin(), [](S s1, S s2) { return s1.i + s2.other; });
+    assert((c == std::array{10, 21, 33, 50}));
+  }
+
+  { // check that std::invoke is used
+    struct S { int i; };
+    S a[] = { S{1}, S{3}, S{2} };
+    S b[] = { S{2}, S{5}, S{3} };
+    std::array<int, 3> c;
+    auto ret = std::ranges::transform(a, b, c.data(), [](int i, int j) { return i + j + 2; }, &S::i, &S::i);
+    assert((c == std::array{5, 10, 7}));
+    assert(ret.out == c.data() + 3);
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
index 7046d6a..b145d56 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
@@ -25,7 +25,7 @@
 TEST_CONSTEXPR bool test_constexpr() {
           int ia[]       = {0, 1, 1, 3, 4};
     const int expected[] = {0, 1, 3, 4};
-    const size_t N = 4;
+    const std::size_t N = 4;
 
     auto it = std::unique(std::begin(ia), std::end(ia));
     return it == (std::begin(ia) + N)
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
index 9f0c695..91535f0 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
@@ -25,7 +25,7 @@
 TEST_CONSTEXPR bool test_constexpr() {
           int ia[]       = {0, 1, 1, 3, 4};
     const int expected[] = {0, 1, 3, 4};
-    const size_t N = 4;
+    const std::size_t N = 4;
 
     auto it = std::unique(std::begin(ia), std::end(ia), [](int a, int b) {return a == b; });
     return it == (std::begin(ia) + N)
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/ranges.adjacent_find.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/ranges.adjacent_find.pass.cpp
index c040e27..d2e0bb5 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/ranges.adjacent_find.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/ranges.adjacent_find.pass.cpp
@@ -51,13 +51,13 @@
 static_assert(!HasAdjacentFindR<ForwardRangeNotSentinelEqualityComparableWith>);
 static_assert(!HasAdjacentFindR<UncheckedRange<NotComparable>>);
 
-template <size_t N>
+template <std::size_t N>
 struct Data {
   std::array<int, N> input;
   int expected;
 };
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test(Data<N> d) {
   {
     std::same_as<Iter> decltype(auto) ret =
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
index dfa425d..e40f1ed 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
@@ -20,68 +20,119 @@
 
 #include <algorithm>
 #include <cassert>
+#include <functional>
 
-#include "test_macros.h"
 #include "test_iterators.h"
+#include "test_macros.h"
+#include "type_algorithms.h"
 
-template <class Iter1, class Iter2 = Iter1>
-void test_equal() {
-  int a[]          = {0, 1, 2, 3, 4, 5};
-  const unsigned s = sizeof(a) / sizeof(a[0]);
-  int b[s]         = {0, 1, 2, 5, 4, 5};
+template <class UnderlyingType, class Iter1>
+struct Test {
+  template <class Iter2>
+  TEST_CONSTEXPR_CXX20 void operator()() {
+    UnderlyingType a[]  = {0, 1, 2, 3, 4, 5};
+    const unsigned s    = sizeof(a) / sizeof(a[0]);
+    UnderlyingType b[s] = {0, 1, 2, 5, 4, 5};
 
-  assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a)));
-  assert(std::equal(Iter2(a), Iter2(a + s), Iter1(a)));
-  assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b)));
+    assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a)));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b)));
 
 #if TEST_STD_VER >= 14
-  assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s)));
-  assert(std::equal(Iter2(a), Iter2(a + s), Iter1(a), Iter1(a + s)));
-  assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s - 1)));
-  assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), Iter2(b + s)));
+    assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), std::equal_to<>()));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), std::equal_to<>()));
+
+    assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s)));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s - 1)));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), Iter2(b + s)));
+
+    assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s), std::equal_to<>()));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s - 1), std::equal_to<>()));
+    assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), Iter2(b + s), std::equal_to<>()));
 #endif
+  }
+};
+
+struct TestNarrowingEqualTo {
+  template <class UnderlyingType>
+  TEST_CONSTEXPR_CXX20 void operator()() {
+    UnderlyingType a[] = {
+        UnderlyingType(0x1000),
+        UnderlyingType(0x1001),
+        UnderlyingType(0x1002),
+        UnderlyingType(0x1003),
+        UnderlyingType(0x1004)};
+    UnderlyingType b[] = {
+        UnderlyingType(0x1600),
+        UnderlyingType(0x1601),
+        UnderlyingType(0x1602),
+        UnderlyingType(0x1603),
+        UnderlyingType(0x1604)};
+
+    assert(std::equal(a, a + 5, b, std::equal_to<char>()));
+#if TEST_STD_VER >= 14
+    assert(std::equal(a, a + 5, b, b + 5, std::equal_to<char>()));
+#endif
+  }
+};
+
+template <class UnderlyingType, class TypeList>
+struct TestIter2 {
+  template <class Iter1>
+  TEST_CONSTEXPR_CXX20 void operator()() {
+    types::for_each(TypeList(), Test<UnderlyingType, Iter1>());
+  }
+};
+
+struct AddressCompare {
+  int i = 0;
+  TEST_CONSTEXPR_CXX20 AddressCompare(int) {}
+
+  operator char() { return static_cast<char>(i); }
+
+  friend TEST_CONSTEXPR_CXX20 bool operator==(const AddressCompare& lhs, const AddressCompare& rhs) {
+    return &lhs == &rhs;
+  }
+
+  friend TEST_CONSTEXPR_CXX20 bool operator!=(const AddressCompare& lhs, const AddressCompare& rhs) {
+    return &lhs != &rhs;
+  }
+};
+
+TEST_CONSTEXPR_CXX20 bool test() {
+  types::for_each(types::cpp17_input_iterator_list<int*>(), TestIter2<int, types::cpp17_input_iterator_list<int*> >());
+  types::for_each(types::cpp17_input_iterator_list<char*>(), TestIter2<char, types::cpp17_input_iterator_list<char*> >());
+  types::for_each(types::cpp17_input_iterator_list<AddressCompare*>(),
+                 TestIter2<AddressCompare, types::cpp17_input_iterator_list<AddressCompare*> >());
+
+  types::for_each(types::integral_types(), TestNarrowingEqualTo());
+
+  return true;
 }
 
-#if TEST_STD_VER > 17
-TEST_CONSTEXPR bool test_constexpr() {
-    int ia[] = {1, 3, 6, 7};
-    int ib[] = {1, 3};
-    int ic[] = {1, 3, 5, 7};
-    typedef cpp17_input_iterator<int*>         II;
-    typedef bidirectional_iterator<int*> BI;
+struct Base {};
+struct Derived : virtual Base {};
 
-    return !std::equal(std::begin(ia), std::end(ia), std::begin(ic))
-        && !std::equal(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic))
-        &&  std::equal(std::begin(ib), std::end(ib), std::begin(ic))
-        && !std::equal(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic))
-
-        &&  std::equal(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)))
-        && !std::equal(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)))
-        ;
-    }
+int main(int, char**) {
+  test();
+#if TEST_STD_VER >= 20
+  static_assert(test());
 #endif
 
+  types::for_each(types::as_pointers<types::cv_qualified_versions<int> >(),
+                 TestIter2<int, types::as_pointers<types::cv_qualified_versions<int> > >());
+  types::for_each(types::as_pointers<types::cv_qualified_versions<char> >(),
+                 TestIter2<char, types::as_pointers<types::cv_qualified_versions<char> > >());
 
-int main(int, char**)
-{
-  test_equal<cpp17_input_iterator<const int*> >();
-  test_equal<random_access_iterator<const int*> >();
+  {
+    Derived d;
+    Derived* a[] = {&d, nullptr};
+    Base* b[]    = {&d, nullptr};
 
-  // Test all combinations of cv-qualifiers:
-  test_equal<int*>();
-  test_equal<int*, const int*>();
-  test_equal<int*, volatile int*>();
-  test_equal<int*, const volatile int*>();
-  test_equal<const int*>();
-  test_equal<const int*, volatile int*>();
-  test_equal<const int*, const volatile int*>();
-  test_equal<volatile int*>();
-  test_equal<volatile int*, const volatile int*>();
-  test_equal<const volatile int*>();
-
-#if TEST_STD_VER > 17
-    static_assert(test_constexpr());
+    assert(std::equal(a, a + 2, b));
+#if TEST_STD_VER >= 14
+    assert(std::equal(a, a + 2, b, b + 2));
 #endif
+  }
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/ranges.equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/ranges.equal.pass.cpp
index 9e9f82e..828f75e 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/ranges.equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.equal/ranges.equal.pass.cpp
@@ -88,6 +88,21 @@
     }
   }
 
+  { // check that false is returned for non-equal ranges
+    {
+      int a[] = {1, 2, 3, 4};
+      int b[]  = {1, 2, 4, 4};
+      assert(!std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)), Iter2(b), Sent2(Iter2(b + 4))));
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      int b[] = {1, 2, 4, 4};
+      auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
+      auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 4)));
+      assert(!std::ranges::equal(range1, range2));
+    }
+  }
+
   { // check that the predicate is used (return true)
     {
       int a[] = {1, 2, 3, 4};
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.find.first.of/ranges.find_first_of.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.find.first.of/ranges.find_first_of.pass.cpp
index 5673c70..cea3042 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.find.first.of/ranges.find_first_of.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.find.first.of/ranges.find_first_of.pass.cpp
@@ -71,7 +71,7 @@
 struct Data {
   std::array<int, N1> input1;
   std::array<int, N2> input2;
-  ptrdiff_t expected;
+  std::ptrdiff_t expected;
 };
 
 template <class Iter1, class Sent1, class Iter2, class Sent2, int N1, int N2>
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
index 6eb5c24..371f6c9 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
@@ -25,7 +25,7 @@
 TEST_CONSTEXPR bool test_constexpr() {
     int ia[] = {1, 3, 6, 7};
     int expected[] = {3, 5, 8, 9};
-    const size_t N = 4;
+    const std::size_t N = 4;
 
     auto it = std::for_each_n(std::begin(ia), N, [](int &a) { a += 2; });
     return it == (std::begin(ia) + N)
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/ranges.binary_search.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/ranges.binary_search.pass.cpp
index a1abdaf..cbeb7eb 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/ranges.binary_search.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/ranges.binary_search.pass.cpp
@@ -131,6 +131,13 @@
     auto range = std::ranges::subrange(It(a), Sent(It(a + 5)));
     assert(std::ranges::binary_search(range, 1));
   }
+
+  { // check that false is returned when the element doesn't exist, but an element with a greater value is in the range
+    int a[] = {1, 2, 4};
+    assert(!std::ranges::binary_search(It(a), Sent(It(a + 3)), 3));
+    auto range = std::ranges::subrange(It(a), Sent(It(a + 3)));
+    assert(!std::ranges::binary_search(range, 3));
+  }
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/ranges.lower_bound.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/ranges.lower_bound.pass.cpp
index e7af57b..cffce51 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/ranges.lower_bound.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/ranges.lower_bound.pass.cpp
@@ -194,6 +194,22 @@
       assert(base(ret) == a);
     }
   }
+
+  { // check that the middle of a range is returned when there are smaller and larger elements
+    {
+      int a[] = {1, 2, 3, 4, 6, 7, 8};
+      auto ret = std::ranges::lower_bound(It(a), It(a + 7), 5);
+      assert(base(ret) == a + 4);
+      assert(*ret == 6);
+    }
+    {
+      int a[] = {1, 2, 3, 4, 6, 7, 8};
+      auto range = std::ranges::subrange(It(a), It(a + 7));
+      auto ret = std::ranges::lower_bound(range, 5);
+      assert(base(ret) == a + 4);
+      assert(*ret == 6);
+    }
+  }
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/ranges.upper_bound.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/ranges.upper_bound.pass.cpp
index 762fd78..cab7831 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/ranges.upper_bound.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/ranges.upper_bound.pass.cpp
@@ -193,6 +193,22 @@
       assert(base(ret) == a + 1);
     }
   }
+
+  { // check that the middle of a range is returned when there are smaller and larger elements
+    {
+      int a[] = {1, 2, 3, 4, 6, 7, 8};
+      auto ret = std::ranges::upper_bound(It(a), It(a + 7), 5);
+      assert(base(ret) == a + 4);
+      assert(*ret == 6);
+    }
+    {
+      int a[] = {1, 2, 3, 4, 6, 7, 8};
+      auto range = std::ranges::subrange(It(a), It(a + 7));
+      auto ret = std::ranges::upper_bound(range, 5);
+      assert(base(ret) == a + 4);
+      assert(*ret == 6);
+    }
+  }
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
index 1ea5199..9756a6f 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap.pass.cpp
index f294d9d..fc207c9 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap.pass.cpp
@@ -72,7 +72,7 @@
 // !indirect_strict_weak_order<Comp, projected<iterator_t<R>, Proj>>
 static_assert(!HasIsHeapRange<R<NoComparator*>>);
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(std::array<int, N> input, bool expected) {
   auto begin = Iter(input.data());
   auto end = Sent(Iter(input.data() + input.size()));
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap_until.pass.cpp
index e6a74fe..f1dc6ad 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/ranges_is_heap_until.pass.cpp
@@ -72,8 +72,8 @@
 // !indirect_strict_weak_order<Comp, projected<iterator_t<R>, Proj>>
 static_assert(!HasIsHeapUntilRange<R<NoComparator*>>);
 
-template <class Iter, class Sent, size_t N>
-constexpr void test_one(std::array<int, N> input, size_t until_index) {
+template <class Iter, class Sent, std::size_t N>
+constexpr void test_one(std::array<int, N> input, std::size_t until_index) {
   auto begin = Iter(input.data());
   auto end = Sent(Iter(input.data() + input.size()));
 
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/ranges_make_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/ranges_make_heap.pass.cpp
index 59b8283..5d8086d 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/ranges_make_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/ranges_make_heap.pass.cpp
@@ -58,14 +58,14 @@
 static_assert(!HasMakeHeapR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasMakeHeapR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <size_t N, class T, class Iter>
+template <std::size_t N, class T, class Iter>
 constexpr void verify_heap(const std::array<T, N>& heapified, Iter last, std::array<T, N> expected) {
   assert(heapified == expected);
   assert(base(last) == heapified.data() + heapified.size());
   assert(std::is_heap(heapified.begin(), heapified.end()));
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(const std::array<int, N> input, std::array<int, N> expected) {
   { // (iterator, sentinel) overload.
     auto heapified = input;
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
index ba11faa..cc10d05 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
index 336b4ac..3820b67 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/ranges_pop_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/ranges_pop_heap.pass.cpp
index 6ce05db..e190586 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/ranges_pop_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/ranges_pop_heap.pass.cpp
@@ -58,7 +58,7 @@
 static_assert(!HasPopHeapR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasPopHeapR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <size_t N, class T, class Iter>
+template <std::size_t N, class T, class Iter>
 constexpr void verify_heap(const std::array<T, N>& heapified, Iter last, std::array<T, N> expected) {
   assert(heapified == expected);
   assert(base(last) == heapified.data() + heapified.size());
@@ -66,7 +66,7 @@
   assert(*std::max_element(heapified.begin(), heapified.end()) == heapified.back());
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(const std::array<int, N> input, std::array<int, N> expected) {
   assert(!input.empty());
   assert(std::is_heap(input.begin(), input.end()));
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/ranges_push_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/ranges_push_heap.pass.cpp
index e2dc0ac..331f077 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/ranges_push_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/ranges_push_heap.pass.cpp
@@ -58,14 +58,14 @@
 static_assert(!HasPushHeapR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasPushHeapR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <size_t N, class T, class Iter>
+template <std::size_t N, class T, class Iter>
 constexpr void verify_heap(const std::array<T, N>& heapified, Iter last, std::array<T, N> expected) {
   assert(heapified == expected);
   assert(base(last) == heapified.data() + heapified.size());
   assert(std::is_heap(heapified.begin(), heapified.end()));
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(const std::array<int, N> input, std::array<int, N> expected) {
   if (!input.empty()) {
     assert(std::is_heap(input.begin(), input.end() - 1));
diff --git a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp
similarity index 63%
rename from third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp
index 0ed37a2..e3cb233 100644
--- a/third_party/llvm-project/libcxx/test/libcxx/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/complexity.pass.cpp
@@ -21,8 +21,8 @@
 
 struct Stats {
   int compared = 0;
-  int copied = 0;
-  int moved = 0;
+  int copied   = 0;
+  int moved    = 0;
 } stats;
 
 struct MyInt {
@@ -46,30 +46,30 @@
   }
 };
 
-int main(int, char**)
-{
-  const int N = 100'000;
+int main(int, char**) {
+  constexpr int N = (1 << 20);
   std::vector<MyInt> v;
   v.reserve(N);
   std::mt19937 g;
-  for (int i = 0; i < N; ++i)
-    v.emplace_back(g());
-  std::make_heap(v.begin(), v.end());
-
-  // The exact stats of our current implementation are recorded here.
-  // If something changes to make them go a bit up or down, that's probably fine,
-  // and we can just update this test.
-  // But if they suddenly leap upward, that's a bad thing.
-
-  stats = {};
-  std::sort_heap(v.begin(), v.end());
-  assert(stats.copied == 0);
-  assert(stats.moved == 1'764'997);
+  for (int i = 0; i < N; ++i) {
+    v.emplace_back(i);
+  }
+  for (int logn = 10; logn <= 20; ++logn) {
+    const int n = (1 << logn);
+    auto first  = v.begin();
+    auto last   = v.begin() + n;
+    std::shuffle(first, last, g);
+    std::make_heap(first, last);
+    // The exact stats of our current implementation are recorded here.
+    stats = {};
+    std::sort_heap(first, last);
+    LIBCPP_ASSERT(stats.copied == 0);
+    LIBCPP_ASSERT(stats.moved <= 2 * n + n * logn);
 #ifndef _LIBCPP_ENABLE_DEBUG_MODE
-  assert(stats.compared == 1'534'701);
+    LIBCPP_ASSERT(stats.compared <= n * logn);
 #endif
-
-  assert(std::is_sorted(v.begin(), v.end()));
-
+    LIBCPP_ASSERT(std::is_sorted(first, last));
+    LIBCPP_ASSERT(stats.compared <= 2 * n * logn);
+  }
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/ranges_sort_heap.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/ranges_sort_heap.pass.cpp
index faf1e23..128ff80 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/ranges_sort_heap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/ranges_sort_heap.pass.cpp
@@ -25,6 +25,7 @@
 #include <array>
 #include <concepts>
 #include <functional>
+#include <random>
 #include <ranges>
 
 #include "almost_satisfies_types.h"
@@ -58,14 +59,14 @@
 static_assert(!HasSortHeapR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasSortHeapR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <size_t N, class T, class Iter>
+template <std::size_t N, class T, class Iter>
 constexpr void verify_sorted(const std::array<T, N>& sorted, Iter last, std::array<T, N> expected) {
   assert(sorted == expected);
   assert(base(last) == sorted.data() + sorted.size());
   assert(std::is_sorted(sorted.begin(), sorted.end()));
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(const std::array<int, N> input, std::array<int, N> expected) {
   assert(std::is_heap(input.begin(), input.end()));
 
@@ -212,9 +213,63 @@
   return true;
 }
 
+struct Stats {
+  int compared = 0;
+  int copied   = 0;
+  int moved    = 0;
+} stats;
+
+struct MyInt {
+  int value;
+  explicit MyInt(int xval) : value(xval) {}
+  MyInt(const MyInt& other) : value(other.value) { ++stats.copied; }
+  MyInt(MyInt&& other) : value(other.value) { ++stats.moved; }
+  MyInt& operator=(const MyInt& other) {
+    value = other.value;
+    ++stats.copied;
+    return *this;
+  }
+  MyInt& operator=(MyInt&& other) {
+    value = other.value;
+    ++stats.moved;
+    return *this;
+  }
+  static bool Comp(const MyInt& a, const MyInt& b) {
+    ++stats.compared;
+    return a.value < b.value;
+  }
+};
+
+void test_complexity() {
+  constexpr int N = (1 << 20);
+  std::vector<MyInt> v;
+  v.reserve(N);
+  std::mt19937 g;
+  for (int i = 0; i < N; ++i) {
+    v.emplace_back(i);
+  }
+  for (int logn = 10; logn <= 20; ++logn) {
+    const int n = (1 << logn);
+    auto first  = v.begin();
+    auto last   = v.begin() + n;
+    std::shuffle(first, last, g);
+    std::make_heap(first, last, &MyInt::Comp);
+    // The exact stats of our current implementation are recorded here.
+    stats = {};
+    std::ranges::sort_heap(first, last, &MyInt::Comp);
+    LIBCPP_ASSERT(stats.copied == 0);
+    LIBCPP_ASSERT(stats.moved <= 2 * n + n * logn);
+#ifndef _LIBCPP_ENABLE_DEBUG_MODE
+    LIBCPP_ASSERT(stats.compared <= n * logn);
+#endif
+    LIBCPP_ASSERT(std::is_sorted(first, last, &MyInt::Comp));
+    LIBCPP_ASSERT(stats.compared <= 2 * n * logn);
+  }
+}
+
 int main(int, char**) {
   test();
   static_assert(test());
-
+  test_complexity();
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.max.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.max.pass.cpp
index 3e0d82d..e9e5240 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.max.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.max.pass.cpp
@@ -176,19 +176,38 @@
 
 template <class It, class Sent = It>
 constexpr void test_range_types() {
-  int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
+  std::iter_value_t<It> a[] = {7, 6, 9, 3, 5, 1, 2, 4};
   auto range = std::ranges::subrange(It(a), Sent(It(a + 8)));
-  int ret = std::ranges::max(range);
+  auto ret = std::ranges::max(range);
   assert(ret == 9);
 }
 
 constexpr void test_range() {
-  { // check that all range types work
-    test_range_types<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
-    test_range_types<forward_iterator<int*>>();
-    test_range_types<bidirectional_iterator<int*>>();
-    test_range_types<random_access_iterator<int*>>();
-    test_range_types<contiguous_iterator<int*>>();
+  // check that all range types work
+  {
+    struct NonTrivialInt {
+      int val_;
+      constexpr NonTrivialInt(int val) : val_(val) {}
+      constexpr NonTrivialInt(const NonTrivialInt& other) : val_(other.val_) {}
+      constexpr NonTrivialInt& operator=(const NonTrivialInt& other) {
+        val_ = other.val_;
+        return *this;
+      }
+
+      constexpr ~NonTrivialInt() {}
+
+      auto operator<=>(const NonTrivialInt&) const = default;
+    };
+
+    auto call_with_sentinels = []<class Iter> {
+      if constexpr (std::forward_iterator<Iter>)
+        test_range_types<Iter, Iter>();
+      test_range_types<Iter, sentinel_wrapper<Iter>>();
+      test_range_types<Iter, sized_sentinel<Iter>>();
+    };
+
+    types::for_each(types::cpp20_input_iterator_list<int*>{}, call_with_sentinels);
+    types::for_each(types::cpp20_input_iterator_list<NonTrivialInt*>{}, call_with_sentinels);
   }
 
   int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.min.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.min.pass.cpp
index a211fe6..3d92964 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.min.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.min.pass.cpp
@@ -171,19 +171,38 @@
 
 template <class It, class Sent = It>
 constexpr void test_range_types() {
-  int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
+  std::iter_value_t<It> a[] = {7, 6, 9, 3, 5, 1, 2, 4};
   auto range = std::ranges::subrange(It(a), Sent(It(a + 8)));
-  int ret = std::ranges::min(range);
+  auto ret = std::ranges::min(range);
   assert(ret == 1);
 }
 
 constexpr void test_range() {
-  { // check that all range types work
-    test_range_types<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
-    test_range_types<forward_iterator<int*>>();
-    test_range_types<bidirectional_iterator<int*>>();
-    test_range_types<random_access_iterator<int*>>();
-    test_range_types<contiguous_iterator<int*>>();
+  // check that all range types work
+  {
+    struct NonTrivialInt {
+      int val_;
+      constexpr NonTrivialInt(int val) : val_(val) {}
+      constexpr NonTrivialInt(const NonTrivialInt& other) : val_(other.val_) {}
+      constexpr NonTrivialInt& operator=(const NonTrivialInt& other) {
+        val_ = other.val_;
+        return *this;
+      }
+
+      constexpr ~NonTrivialInt() {}
+
+      auto operator<=>(const NonTrivialInt&) const = default;
+    };
+
+    auto call_with_sentinels = []<class Iter> {
+      if constexpr (std::forward_iterator<Iter>)
+        test_range_types<Iter, Iter>();
+      test_range_types<Iter, sentinel_wrapper<Iter>>();
+      test_range_types<Iter, sized_sentinel<Iter>>();
+    };
+
+    types::for_each(types::cpp20_input_iterator_list<int*>{}, call_with_sentinels);
+    types::for_each(types::cpp20_input_iterator_list<NonTrivialInt*>{}, call_with_sentinels);
   }
 
   int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.minmax.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.minmax.pass.cpp
index 828a820..fd0d6df 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.minmax.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.min.max/ranges.minmax.pass.cpp
@@ -30,6 +30,7 @@
 #include <functional>
 #include <memory>
 #include <ranges>
+#include <string>
 
 #include "test_iterators.h"
 
@@ -324,6 +325,26 @@
     assert(ret.min == 1);
     assert(ret.max == 4);
   }
+  {
+    // check that the input iterator isn't moved from multiple times
+    const std::string str{"this long string will be dynamically allocated"};
+    std::string a[] = {str};
+    auto range      = std::ranges::subrange(
+        cpp20_input_iterator(std::move_iterator(a)), sentinel_wrapper(cpp20_input_iterator(std::move_iterator(a + 1))));
+    auto ret = std::ranges::minmax(range);
+    assert(ret.min == str);
+    assert(ret.max == str);
+  }
+  {
+    // check that the forward iterator isn't moved from multiple times
+    const std::string str{"this long string will be dynamically allocated"};
+    std::string a[] = {str};
+    auto range =
+        std::ranges::subrange(forward_iterator(std::move_iterator(a)), forward_iterator(std::move_iterator(a + 1)));
+    auto ret = std::ranges::minmax(range);
+    assert(ret.min == str);
+    assert(ret.max == str);
+  }
 }
 
 constexpr bool test() {
@@ -338,15 +359,5 @@
   test();
   static_assert(test());
 
-  {
-    // check that the iterator isn't moved from multiple times
-    std::shared_ptr<int> a[] = { std::make_shared<int>(42) };
-    auto range = std::ranges::subrange(std::move_iterator(a), std::move_iterator(a + 1));
-    auto [min, max] = std::ranges::minmax(range);
-    assert(a[0] == nullptr);
-    assert(min != nullptr);
-    assert(max == min);
-  }
-
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.nth.element/ranges_nth_element.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.nth.element/ranges_nth_element.pass.cpp
index a648e7d..ad3c8ab 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.nth.element/ranges_nth_element.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.nth.element/ranges_nth_element.pass.cpp
@@ -64,8 +64,8 @@
 static_assert(!HasNthElementR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasNthElementR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <size_t N, class T, class Iter>
-constexpr void verify_nth(const std::array<T, N>& partially_sorted, size_t nth_index, Iter last, T expected_nth) {
+template <std::size_t N, class T, class Iter>
+constexpr void verify_nth(const std::array<T, N>& partially_sorted, std::size_t nth_index, Iter last, T expected_nth) {
   // Note that the exact output of `nth_element` is unspecified and may vary between implementations.
 
   assert(base(last) == partially_sorted.end());
@@ -92,8 +92,8 @@
   }
 }
 
-template <class Iter, class Sent, size_t N>
-constexpr void test_one(std::array<int, N> input, size_t nth_index, std::optional<int> expected_nth = {}) {
+template <class Iter, class Sent, std::size_t N>
+constexpr void test_one(std::array<int, N> input, std::size_t nth_index, std::optional<int> expected_nth = {}) {
   assert(expected_nth || nth_index == N);
 
   { // (iterator, sentinel) overload.
@@ -126,7 +126,7 @@
   }
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_all_cases(std::array<int, N> input) {
   auto sorted = input;
   std::sort(sorted.begin(), sorted.end());
@@ -162,7 +162,7 @@
 
     { // nth element is in the right place.
       std::array input = {6, 5, 3, 1, 4, 2};
-      constexpr size_t N = input.size();
+      constexpr std::size_t N = input.size();
       test_one<Iter, Sent, N>(input, 2, /*expected_nth=*/3);
     }
 
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.next_permutation.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.next_permutation.pass.cpp
index 5e7b839..77a7799 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.next_permutation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.next_permutation.pass.cpp
@@ -50,7 +50,7 @@
 static_assert(!HasNextPermutationR<BidirectionalRangeNotSentinelWeaklyEqualityComparableWith>);
 static_assert(!HasNextPermutationR<UncheckedRange<const int*>>); // not sortable
 
-constexpr size_t factorial(size_t i) {
+constexpr std::size_t factorial(size_t i) {
   std::array memoized = {1, 1, 2, 6, 24, 120, 720, 5040, 40320};
   return memoized[i];
 }
@@ -87,8 +87,8 @@
   // lexicographically greater than the previous. If these two conditions hold (the number of permutations is `N!`, and
   // each permutation is lexicographically greater than the previous one), it follows that the
   // `ranges::next_permutation` algorithm works correctly.
-  for (size_t i = 0; i <= current_permutation.size(); ++i) {
-    size_t count = 0;
+  for (std::size_t i = 0; i <= current_permutation.size(); ++i) {
+    std::size_t count = 0;
     bool next_found = true;
 
     while (next_found) {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.prev_permutation.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.prev_permutation.pass.cpp
index 3ec1af1..a62138e 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.prev_permutation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.permutation.generators/ranges.prev_permutation.pass.cpp
@@ -50,7 +50,7 @@
 static_assert(!HasPrevPermutationR<BidirectionalRangeNotSentinelWeaklyEqualityComparableWith>);
 static_assert(!HasPrevPermutationR<UncheckedRange<const int*>>); // not sortable
 
-constexpr size_t factorial(size_t i) {
+constexpr std::size_t factorial(size_t i) {
   std::array memoized = {1, 1, 2, 6, 24, 120, 720, 5040, 40320};
   return memoized[i];
 }
@@ -87,8 +87,8 @@
   // lexicographically less than the previous. If these two conditions hold (the number of permutations is `N!`, and
   // each permutation is lexicographically less than the previous one), it follows that the `ranges::prev_permutation`
   // algorithm works correctly.
-  for (size_t i = 0; i <= current_permutation.size(); ++i) {
-    size_t count = 0;
+  for (std::size_t i = 0; i <= current_permutation.size(); ++i) {
+    std::size_t count = 0;
     bool next_found = true;
 
     while (next_found) {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/ranges_partial_sort_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/ranges_partial_sort_copy.pass.cpp
index 7a4ebd9..532ee9b 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/ranges_partial_sort_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/ranges_partial_sort_copy.pass.cpp
@@ -119,17 +119,17 @@
 
 static_assert(std::is_same_v<std::ranges::partial_sort_copy_result<int, int>, std::ranges::in_out_result<int, int>>);
 
-template <class Iter, class Sent, class OutIter, class OutSent, size_t N>
+template <class Iter, class Sent, class OutIter, class OutSent, std::size_t N>
 constexpr void test_one(
-    std::array<int, N> input, size_t input_size, size_t output_size, std::array<int, N> sorted) {
+    std::array<int, N> input, std::size_t input_size, size_t output_size, std::array<int, N> sorted) {
   assert(input_size <= N);
   assert(output_size <= N + 1); // To support testing the case where output size exceeds input size.
 
   using ResultT = std::ranges::partial_sort_copy_result<Iter, OutIter>;
   // To support testing the case where output size exceeds input size; also makes sure calling `out.data() + int()` is
   // valid.
-  constexpr size_t OutputSize = N + 1;
-  size_t result_size = std::ranges::min(input_size, output_size);
+  constexpr std::size_t OutputSize = N + 1;
+  std::size_t result_size = std::ranges::min(input_size, output_size);
 
   auto begin = input.data();
   auto end = input.data() + input_size;
@@ -167,13 +167,13 @@
 
 }
 
-template <class Iter, class Sent, class OutIter, class OutSent, size_t N>
+template <class Iter, class Sent, class OutIter, class OutSent, std::size_t N>
 constexpr void test_all_subsequences(const std::array<int, N> input) {
   auto sorted = input;
   std::sort(sorted.begin(), sorted.end());
 
   // Whole input, increasing output size. Also check the case when `output_size` exceeds input size.
-  for (size_t out_size = 0; out_size <= N + 1; ++out_size) {
+  for (std::size_t out_size = 0; out_size <= N + 1; ++out_size) {
     test_one<Iter, Sent, OutIter, OutSent>(input, N, out_size, sorted);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort/ranges_partial_sort.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort/ranges_partial_sort.pass.cpp
index e70828f..af30466 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort/ranges_partial_sort.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/partial.sort/ranges_partial_sort.pass.cpp
@@ -62,8 +62,8 @@
 static_assert(!HasPartialSortR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasPartialSortR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <class Iter, class Sent, size_t N>
-constexpr void test_one(std::array<int, N> input, size_t mid_index, std::array<int, N> sorted) {
+template <class Iter, class Sent, std::size_t N>
+constexpr void test_one(std::array<int, N> input, std::size_t mid_index, std::array<int, N> sorted) {
   { // (iterator, sentinel) overload.
     auto partially_sorted = input;
     auto begin = Iter(partially_sorted.data());
@@ -89,12 +89,12 @@
   }
 }
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_all_subsequences(std::array<int, N> input) {
   auto sorted = input;
   std::sort(sorted.begin(), sorted.end());
 
-  for (size_t n = 0; n <= N; ++n) {
+  for (std::size_t n = 0; n <= N; ++n) {
     test_one<Iter, Sent, N>(input, n, sorted);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/sort/ranges.sort.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/sort/ranges.sort.pass.cpp
index 96f4c1c..2463bf7 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/sort/ranges.sort.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/sort/ranges.sort.pass.cpp
@@ -58,7 +58,7 @@
 static_assert(!HasSortR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasSortR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 constexpr void test_one(std::array<int, N> input, std::array<int, N> expected) {
   { // (iterator, sentinel) overload.
     auto sorted = input;
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/ranges.stable.sort.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/ranges.stable.sort.pass.cpp
index f83d093..ea0a3eb 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/ranges.stable.sort.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/ranges.stable.sort.pass.cpp
@@ -57,7 +57,7 @@
 static_assert(!HasStableSortR<UncheckedRange<int*>, BadComparator>);
 static_assert(!HasStableSortR<UncheckedRange<const int*>>); // Doesn't satisfy `sortable`.
 
-template <class Iter, class Sent, size_t N>
+template <class Iter, class Sent, std::size_t N>
 void test_one(std::array<int, N> input, std::array<int, N> expected) {
   { // (iterator, sentinel) overload.
     auto sorted = input;
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way.pass.cpp
new file mode 100644
index 0000000..4c940eb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way.pass.cpp
@@ -0,0 +1,122 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <algorithm>
+
+// template<class InputIterator1, class InputIterator2, class Cmp>
+//     constexpr auto
+//     lexicographical_compare_three_way(InputIterator1 first1, InputIterator1 last1,
+//                                       InputIterator2 first2, InputIterator2 last2)
+
+#include <array>
+#include <algorithm>
+#include <cassert>
+#include <compare>
+#include <concepts>
+
+#include "test_macros.h"
+#include "test_comparisons.h"
+#include "test_iterators.h"
+
+template <typename Iter1, typename Iter2, typename C1, typename C2, typename Order>
+constexpr void test_lexicographical_compare(C1 a, C2 b, Order expected) {
+  std::same_as<Order> decltype(auto) result =
+      std::lexicographical_compare_three_way(Iter1{a.begin()}, Iter1{a.end()}, Iter2{b.begin()}, Iter2{b.end()});
+  assert(expected == result);
+}
+
+template <typename Iter1, typename Iter2>
+constexpr void test_given_iterator_types() {
+  // Both inputs empty
+  test_lexicographical_compare<Iter1, Iter2>(std::array<int, 0>{}, std::array<int, 0>{}, std::strong_ordering::equal);
+  // Left input empty
+  test_lexicographical_compare<Iter1, Iter2>(std::array<int, 0>{}, std::array{0, 1}, std::strong_ordering::less);
+  // Right input empty
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array<int, 0>{}, std::strong_ordering::greater);
+
+  // Identical arrays
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 1}, std::strong_ordering::equal);
+  // "Less" on 2nd element
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 2}, std::strong_ordering::less);
+  // "Greater" on 2nd element
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 2}, std::array{0, 1}, std::strong_ordering::greater);
+  // "Greater" on 2nd element, but "less" on first entry
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 2}, std::array{1, 1}, std::strong_ordering::less);
+  // Identical elements, but longer
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 1, 2}, std::strong_ordering::less);
+  // Identical elements, but shorter
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1, 2}, std::array{0, 1}, std::strong_ordering::greater);
+}
+
+template <typename Iter1>
+constexpr void test_iterator_types1() {
+  test_given_iterator_types<Iter1, int*>();
+  test_given_iterator_types<Iter1, const int*>();
+  test_given_iterator_types<Iter1, cpp17_input_iterator<const int*>>();
+  test_given_iterator_types<Iter1, forward_iterator<const int*>>();
+  test_given_iterator_types<Iter1, bidirectional_iterator<const int*>>();
+  test_given_iterator_types<Iter1, random_access_iterator<const int*>>();
+  test_given_iterator_types<Iter1, contiguous_iterator<const int*>>();
+}
+
+constexpr void test_iterator_types() {
+  // Exhaustively test all combinations of `int*`, `const int*`, `cpp17_input_iterator`,
+  // `forward_iterator`, `bidirectional_iterator`, `random_access_iterator`,
+  // `contiguous_iterator`.
+  //
+  // `lexicographical_compare_three_way` has a fast path which triggers if both
+  // iterators are random access iterators.
+
+  test_iterator_types1<int*>();
+  test_iterator_types1<const int*>();
+  test_iterator_types1<cpp17_input_iterator<const int*>>();
+  test_iterator_types1<forward_iterator<const int*>>();
+  test_iterator_types1<bidirectional_iterator<const int*>>();
+  test_iterator_types1<random_access_iterator<const int*>>();
+  test_iterator_types1<contiguous_iterator<const int*>>();
+}
+
+// Check for other comparison categories
+constexpr void test_comparison_categories() {
+  // Check all comparison categories for inputs with a difference in the contained elements
+  test_lexicographical_compare<const StrongOrder*, const StrongOrder*>(
+      std::array<StrongOrder, 2>{0, 1}, std::array<StrongOrder, 2>{1, 1}, std::strong_ordering::less);
+  test_lexicographical_compare<const WeakOrder*, const WeakOrder*>(
+      std::array<WeakOrder, 2>{0, 1}, std::array<WeakOrder, 2>{1, 1}, std::weak_ordering::less);
+  test_lexicographical_compare<const PartialOrder*, const PartialOrder*>(
+      std::array<PartialOrder, 2>{0, 1}, std::array<PartialOrder, 2>{1, 1}, std::partial_ordering::less);
+
+  // Check comparison categories with arrays of different sizes
+  test_lexicographical_compare<const StrongOrder*, const StrongOrder*>(
+      std::array<StrongOrder, 2>{0, 1}, std::array<StrongOrder, 3>{0, 1, 2}, std::strong_ordering::less);
+  test_lexicographical_compare<const WeakOrder*, const WeakOrder*>(
+      std::array<WeakOrder, 2>{0, 1}, std::array<WeakOrder, 3>{0, 1, 2}, std::weak_ordering::less);
+  test_lexicographical_compare<const PartialOrder*, const PartialOrder*>(
+      std::array<PartialOrder, 2>{0, 1}, std::array<PartialOrder, 3>{0, 1, 2}, std::partial_ordering::less);
+
+  // Check for a `partial_ordering::unordered` result
+  test_lexicographical_compare<const PartialOrder*, const PartialOrder*>(
+      std::array<PartialOrder, 2>{std::numeric_limits<int>::min(), 1},
+      std::array<PartialOrder, 3>{0, 1, 2},
+      std::partial_ordering::unordered);
+}
+
+constexpr bool test() {
+  test_iterator_types();
+  test_comparison_categories();
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.pass.cpp
new file mode 100644
index 0000000..201ff9e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.pass.cpp
@@ -0,0 +1,174 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <algorithm>
+
+// template<class InputIterator1, class InputIterator2, class Cmp>
+//     constexpr auto
+//     lexicographical_compare_three_way(InputIterator1 first1, InputIterator1 last1,
+//                                       InputIterator2 first2, InputIterator2 last2,
+//                                       Cmp comp)
+//       -> decltype(comp(*b1, *b2));
+
+#include <array>
+#include <algorithm>
+#include <cassert>
+#include <compare>
+#include <concepts>
+#include <limits>
+
+#include "test_macros.h"
+#include "test_iterators.h"
+
+using std::array;
+
+constexpr auto compare_last_digit_strong  = [](int a, int b) -> std::strong_ordering { return (a % 10) <=> (b % 10); };
+constexpr auto compare_last_digit_weak    = [](int a, int b) -> std::weak_ordering { return (a % 10) <=> (b % 10); };
+constexpr auto compare_last_digit_partial = [](int a, int b) -> std::partial_ordering {
+  if (a == std::numeric_limits<int>::min() || b == std::numeric_limits<int>::min())
+    return std::partial_ordering::unordered;
+  return (a % 10) <=> (b % 10);
+};
+constexpr auto compare_int_result = [](int a, int b) -> int { return (a % 10) - (b % 10); };
+
+struct StructWithoutCallOperator {};
+
+template <class T>
+concept has_lexicographical_compare =
+    requires(int* ptr, T comp) { std::lexicographical_compare_three_way(ptr, ptr, ptr, ptr, comp); };
+
+// `std::lexicographical_compare_three_way` accepts valid types
+static_assert(has_lexicographical_compare<decltype(compare_last_digit_strong)>);
+static_assert(has_lexicographical_compare<decltype(compare_last_digit_weak)>);
+static_assert(has_lexicographical_compare<decltype(compare_last_digit_partial)>);
+// `std::lexicographical_compare_three_way` rejects non-invocable comparators
+static_assert(!has_lexicographical_compare<StructWithoutCallOperator>);
+// `std::lexicographical_compare_three_way` accepts invalid comparators returning a wrong type.
+// This will trigger a `static_assert` only when actually invoking `has_lexicographical_compare`.
+static_assert(has_lexicographical_compare<decltype(compare_int_result)>);
+
+template <typename Iter1, typename Iter2, typename C1, typename C2, typename Order, typename Comparator>
+constexpr void test_lexicographical_compare(C1 a, C2 b, Comparator comp, Order expected) {
+  std::same_as<Order> decltype(auto) result =
+      std::lexicographical_compare_three_way(Iter1{a.begin()}, Iter1{a.end()}, Iter2{b.begin()}, Iter2{b.end()}, comp);
+  assert(expected == result);
+}
+
+template <typename Iter1, typename Iter2>
+constexpr void test_given_iterator_types() {
+  auto cmp = compare_last_digit_strong;
+  // Both inputs empty
+  test_lexicographical_compare<Iter1, Iter2>(
+      std::array<int, 0>{}, std::array<int, 0>{}, cmp, std::strong_ordering::equal);
+  // Left input empty
+  test_lexicographical_compare<Iter1, Iter2>(std::array<int, 0>{}, std::array{0, 1}, cmp, std::strong_ordering::less);
+  // Right input empty
+  test_lexicographical_compare<Iter1, Iter2>(
+      std::array{0, 1}, std::array<int, 0>{}, cmp, std::strong_ordering::greater);
+
+  // Identical arrays
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 1}, cmp, std::strong_ordering::equal);
+  // "Less" on 2nd element
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 2}, cmp, std::strong_ordering::less);
+  // "Greater" on 2nd element
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 2}, std::array{0, 1}, cmp, std::strong_ordering::greater);
+  // "Greater" on 2nd element, but "less" on first entry
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 2}, std::array{1, 1}, cmp, std::strong_ordering::less);
+  // Identical elements, but longer
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1}, std::array{0, 1, 2}, cmp, std::strong_ordering::less);
+  // Identical elements, but shorter
+  test_lexicographical_compare<Iter1, Iter2>(std::array{0, 1, 2}, std::array{0, 1}, cmp, std::strong_ordering::greater);
+  // Identical arrays, but only if we take the comparator
+  // into account instead of using the default comparator
+  test_lexicographical_compare<Iter1, Iter2>(std::array{10, 21}, std::array{10, 31}, cmp, std::strong_ordering::equal);
+}
+
+template <typename Iter1>
+constexpr void test_iterator_types1() {
+  test_given_iterator_types<Iter1, int*>();
+  test_given_iterator_types<Iter1, const int*>();
+  test_given_iterator_types<Iter1, cpp17_input_iterator<const int*>>();
+  test_given_iterator_types<Iter1, forward_iterator<const int*>>();
+  test_given_iterator_types<Iter1, bidirectional_iterator<const int*>>();
+  test_given_iterator_types<Iter1, random_access_iterator<const int*>>();
+  test_given_iterator_types<Iter1, contiguous_iterator<const int*>>();
+}
+
+constexpr void test_iterator_types() {
+  // Exhaustively test all combinations of `int*`, `const int*`, `cpp17_input_iterator`,
+  // `forward_iterator`, `bidirectional_iterator`, `random_access_iterator`,
+  // `contiguous_iterator`.
+  //
+  // `lexicographical_compare_three_way` has a fast path which triggers if both
+  // iterators are random access iterators.
+
+  test_iterator_types1<int*>();
+  test_iterator_types1<const int*>();
+  test_iterator_types1<cpp17_input_iterator<const int*>>();
+  test_iterator_types1<forward_iterator<const int*>>();
+  test_iterator_types1<bidirectional_iterator<const int*>>();
+  test_iterator_types1<random_access_iterator<const int*>>();
+  test_iterator_types1<contiguous_iterator<const int*>>();
+}
+
+// Check for other comparison categories
+constexpr void test_comparison_categories() {
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0, 1}, std::array{10, 11}, compare_last_digit_weak, std::weak_ordering::equivalent);
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0, 1}, std::array{20, 11}, compare_last_digit_partial, std::partial_ordering::equivalent);
+
+  // Check for all comparison categories with arrays of different sizes
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0}, std::array{0, 1}, compare_last_digit_strong, std::strong_ordering::less);
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0}, std::array{0, 1}, compare_last_digit_weak, std::weak_ordering::less);
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0}, std::array{0, 1}, compare_last_digit_partial, std::partial_ordering::less);
+
+  // Check for a `partial_ordering::unordered` result
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{std::numeric_limits<int>::min(), 1},
+      std::array{0, 1, 2},
+      compare_last_digit_partial,
+      std::partial_ordering::unordered);
+}
+
+// Test for "Complexity: At most N applications of comp."
+constexpr void test_comparator_invocation_count() {
+  int compare_invocation_count     = 0;
+  auto compare_last_digit_counting = [&](int a, int b) -> std::strong_ordering {
+    ++compare_invocation_count;
+    return (a % 10) <=> (b % 10);
+  };
+  // If one of the ranges is empty, the comparator must not be called at all
+  compare_invocation_count = 0;
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0, 1, 2, 3}, std::array<int, 0>{}, compare_last_digit_counting, std::strong_ordering::greater);
+  assert(compare_invocation_count == 0);
+  // The comparator is invoked only `min(left.size(), right.size())` times
+  test_lexicographical_compare<const int*, const int*>(
+      std::array{0, 1, 2}, std::array{0, 1, 2, 3}, compare_last_digit_counting, std::strong_ordering::less);
+  assert(compare_invocation_count == 3);
+}
+
+constexpr bool test() {
+  test_iterator_types();
+  test_comparison_categories();
+  test_comparator_invocation_count();
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.verify.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.verify.cpp
new file mode 100644
index 0000000..bac3ec5
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/alg.three.way/lexicographical_compare_three_way_comp.verify.cpp
@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <algorithm>
+
+// template<class InputIterator1, class InputIterator2, class Cmp>
+//     constexpr auto
+//     lexicographical_compare_three_way(InputIterator1 first1, InputIterator1 last1,
+//                                       InputIterator2 first2, InputIterator2 last2,
+//                                       Cmp comp)
+//       -> decltype(comp(*b1, *b2));
+
+#include <array>
+#include <algorithm>
+#include <cassert>
+#include <compare>
+
+#include "test_macros.h"
+#include "almost_satisfies_types.h"
+
+constexpr bool incorrect_comparator(int a, int b) { return a < b; }
+
+auto test_incorrect_comparator() {
+  std::array a{90, 81};
+  std::array b{10, 11};
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}The comparator passed to lexicographical_compare_three_way must return a comparison category type}}
+  // expected-error@*:* {{no viable conversion}}
+  return std::lexicographical_compare_three_way(a.begin(), a.end(), b.begin(), b.end(), incorrect_comparator);
+}
+
+auto test_invalid_difference_type_first(
+    RandomAccessIteratorBadDifferenceType a, RandomAccessIteratorBadDifferenceType b, int* c, int* d) {
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Using a non-integral difference_type is undefined behavior}}}}
+  return std::lexicographical_compare_three_way(a, b, c, d, std::compare_three_way());
+}
+
+auto test_invalid_difference_type_second(
+    int* a, int* b, RandomAccessIteratorBadDifferenceType c, RandomAccessIteratorBadDifferenceType d) {
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Using a non-integral difference_type is undefined behavior}}}}
+  return std::lexicographical_compare_three_way(a, b, c, d, std::compare_three_way());
+}
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/sortable_helpers.h b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/sortable_helpers.h
index 31385bd..d8cc781 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/sortable_helpers.h
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/alg.sorting/sortable_helpers.h
@@ -9,6 +9,7 @@
 #ifndef SORTABLE_HELPERS_H
 #define SORTABLE_HELPERS_H
 
+#include <cstddef>
 #include <type_traits>
 
 #include "test_macros.h"
@@ -108,7 +109,7 @@
 template <class Iter>
 struct NonBorrowedRange {
   int* data_;
-  size_t size_;
+  std::size_t size_;
 
   // TODO: some algorithms calls std::__copy
   // std::__copy(contiguous_iterator<int*>, sentinel_wrapper<contiguous_iterator<int*>>, contiguous_iterator<int*>) doesn't seem to work.
@@ -116,7 +117,7 @@
   // sentinel_wrapper<contiguous_iterator<int*>>
   using Sent = std::conditional_t<std::contiguous_iterator<Iter>, Iter, sentinel_wrapper<Iter>>;
 
-  constexpr NonBorrowedRange(int* d, size_t s) : data_{d}, size_{s} {}
+  constexpr NonBorrowedRange(int* d, std::size_t s) : data_{d}, size_{s} {}
 
   constexpr Iter begin() const { return Iter{data_}; };
   constexpr Sent end() const { return Sent{Iter{data_ + size_}}; };
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_dangling.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_dangling.pass.cpp
index b19f42f..c71b57e 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_dangling.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_dangling.pass.cpp
@@ -29,9 +29,9 @@
   using Sent = sentinel_wrapper<Iter>;
 
   int* data_;
-  size_t size_;
+  std::size_t size_;
 
-  template <size_t N>
+  template <std::size_t N>
   constexpr explicit NonBorrowedRange(std::array<int, N>& arr) : data_{arr.data()}, size_{arr.size()} {}
 
   constexpr Iter begin() const { return data_; };
@@ -109,7 +109,7 @@
   auto out2 = output.begin() + 1;
 
   int x = 2;
-  size_t count = 1;
+  std::size_t count = 1;
 
   dangling_1st(std::ranges::find, in, x);
   dangling_1st(std::ranges::find_if, in, unary_pred);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp
index 35b9f92..c5e8502 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp
@@ -69,7 +69,7 @@
   Bar c{Foo{3}};
 
   Foo x{2};
-  size_t count = 1;
+  std::size_t count = 1;
 
   test(std::ranges::any_of, in, &Foo::unary_pred, &Bar::val);
   test(std::ranges::all_of, in, &Foo::unary_pred, &Bar::val);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl.compile.pass.cpp
index d457baf..1411796 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl.compile.pass.cpp
@@ -8,6 +8,11 @@
 
 // <algorithm>
 
+// https://buildkite.com/llvm-project/libcxx-ci/builds/15823#0184fc0b-d56b-4774-9e1d-35fe24e09e37
+// It seems like the CI gcc version is buggy. I can't reproduce the failure on my system or on
+// godbolt (https://godbolt.org/z/rsPv8e8fn).
+// UNSUPPORTED: gcc-12
+
 #include <algorithm>
 #include <cstddef>
 #include <functional>
@@ -108,7 +113,10 @@
     // RELIES ON ADL SWAP (void)std::iter_swap(first, mid);
     (void)std::lexicographical_compare(first, last, first2, last2);
     (void)std::lexicographical_compare(first, last, first2, last2, std::less<void*>());
-    // TODO: lexicographical_compare_three_way
+#if TEST_STD_VER > 17
+    (void)std::lexicographical_compare_three_way(first, last, first2, last2);
+    (void)std::lexicographical_compare_three_way(first, last, first2, last2, std::compare_three_way());
+#endif
     (void)std::lower_bound(first, last, value);
     (void)std::lower_bound(first, last, value, std::less<void*>());
     (void)std::make_heap(first, last);
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl_on_new.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl_on_new.pass.cpp
index 5dcfde3..6bd2abd 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl_on_new.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_adl_on_new.pass.cpp
@@ -19,7 +19,7 @@
     static bool isEven(const A& a) { return a.i % 2 == 0; }
 };
 
-void *operator new(size_t, A*) = delete;
+void *operator new(std::size_t, A*) = delete;
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_proxy_iterators_lifetime_bugs.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_proxy_iterators_lifetime_bugs.pass.cpp
index 166806e..3a15d25 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_proxy_iterators_lifetime_bugs.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/robust_against_proxy_iterators_lifetime_bugs.pass.cpp
@@ -547,15 +547,15 @@
 
 #endif // TEST_STD_VER > 17
 
-template <class T, size_t N = 32>
+template <class T, std::size_t N = 32>
 class Input {
   using Array = std::array<T, N>;
 
-  size_t size_ = 0;
+  std::size_t size_ = 0;
   Array values_ = {};
 
 public:
-  template <size_t N2>
+  template <std::size_t N2>
   TEST_CONSTEXPR_CXX20 Input(std::array<T, N2> from) {
     static_assert(N2 <= N, "");
 
@@ -565,7 +565,7 @@
 
   TEST_CONSTEXPR_CXX20 typename Array::iterator begin() { return values_.begin(); }
   TEST_CONSTEXPR_CXX20 typename Array::iterator end() { return values_.begin() + size_; }
-  TEST_CONSTEXPR_CXX20 size_t size() const { return size_; }
+  TEST_CONSTEXPR_CXX20 std::size_t size() const { return size_; }
 };
 
 // TODO: extend `Value` and `Reference` so that it's possible to pass plain integers to all the algorithms.
@@ -624,14 +624,14 @@
   return result;
 }
 
-template <class Input, size_t N, class Func>
+template <class Input, std::size_t N, class Func>
 TEST_CONSTEXPR_CXX20 void test(std::array<Input, N> inputs, Func func) {
   for (auto&& in : inputs) {
     func(in.begin(), in.end());
   }
 }
 
-template <class Input, size_t N, class Func>
+template <class Input, std::size_t N, class Func>
 TEST_CONSTEXPR_CXX20 void test_n(std::array<Input, N> inputs, Func func) {
   for (auto&& in : inputs) {
     func(in.begin(), in.size());
@@ -698,17 +698,17 @@
   // TODO: is_permutation
   test(simple_in, [&](I b, I e) { (void) std::for_each(b, e, is_neg); });
 #if TEST_STD_VER > 14
-  test_n(simple_in, [&](I b, size_t n) { (void) std::for_each_n(b, n, is_neg); });
+  test_n(simple_in, [&](I b, std::size_t n) { (void) std::for_each_n(b, n, is_neg); });
 #endif
   test(simple_in, [&](I b, I e) { (void) std::copy(b, e, out); });
-  test_n(simple_in, [&](I b, size_t n) { (void) std::copy_n(b, n, out); });
+  test_n(simple_in, [&](I b, std::size_t n) { (void) std::copy_n(b, n, out); });
   test(simple_in, [&](I b, I e) { (void) std::copy_backward(b, e, out + N); });
   test(simple_in, [&](I b, I e) { (void) std::copy_if(b, e, out, is_neg); });
   test(simple_in, [&](I b, I e) { (void) std::move(b, e, out); });
   test(simple_in, [&](I b, I e) { (void) std::move_backward(b, e, out + N); });
   test(simple_in, [&](I b, I e) { (void) std::transform(b, e, out, identity); });
   test(simple_in, [&](I b, I e) { (void) std::generate(b, e, gen); });
-  test_n(simple_in, [&](I b, size_t n) { (void) std::generate_n(b, n, gen); });
+  test_n(simple_in, [&](I b, std::size_t n) { (void) std::generate_n(b, n, gen); });
   test(simple_in, [&](I b, I e) { (void) std::remove_copy(b, e, out, x); });
   test(simple_in, [&](I b, I e) { (void) std::remove_copy_if(b, e, out, is_neg); });
   test(simple_in, [&](I b, I e) { (void) std::replace(b, e, x, y); });
diff --git a/third_party/llvm-project/libcxx/test/std/algorithms/robust_re_difference_type.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/algorithms/robust_re_difference_type.compile.pass.cpp
index c060f46..8016cd7 100644
--- a/third_party/llvm-project/libcxx/test/std/algorithms/robust_re_difference_type.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/algorithms/robust_re_difference_type.compile.pass.cpp
@@ -145,7 +145,12 @@
     (void)std::iter_swap(first, mid);
     (void)std::lexicographical_compare(first, last, first2, last2);
     (void)std::lexicographical_compare(first, last, first2, last2, std::less<void*>());
-    // TODO: lexicographical_compare_three_way
+#if TEST_STD_VER > 17
+    // `lexicographical_compare_three_way` static_asserts that the difference type is an integer, as
+    // required by https://eel.is/c++draft/iterator.iterators#2.2
+    //(void)std::lexicographical_compare_three_way(first, last, first2, last2);
+    //(void)std::lexicographical_compare_three_way(first, last, first2, last2, std::compare_three_way());
+#endif
     (void)std::lower_bound(first, last, value);
     (void)std::lower_bound(first, last, value, std::less<void*>());
     (void)std::make_heap(first, last);
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
index de24bc2..b2d83f0 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <atomic>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp
new file mode 100644
index 0000000..9f2a282
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp
@@ -0,0 +1,99 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+
+// XFAIL: availability-synchronization_library-missing
+
+// <atomic>
+
+// Tests the basic features and makes sure they work with a hijacking operator&.
+
+//  template<class T> struct atomic {
+//    using value_type = T;
+//
+//    static constexpr bool is_always_lock_free = implementation-defined;
+//    bool is_lock_free() const volatile noexcept;
+//    bool is_lock_free() const noexcept;
+//
+//    // [atomics.types.operations], operations on atomic types
+//    constexpr atomic() noexcept(is_nothrow_default_constructible_v<T>);
+//    constexpr atomic(T) noexcept;
+//    atomic(const atomic&) = delete;
+//    atomic& operator=(const atomic&) = delete;
+//    atomic& operator=(const atomic&) volatile = delete;
+//
+//    T load(memory_order = memory_order::seq_cst) const volatile noexcept;
+//    T load(memory_order = memory_order::seq_cst) const noexcept;
+//    operator T() const volatile noexcept;
+//    operator T() const noexcept;
+//    void store(T, memory_order = memory_order::seq_cst) volatile noexcept;
+//    void store(T, memory_order = memory_order::seq_cst) noexcept;
+//    T operator=(T) volatile noexcept;
+//    T operator=(T) noexcept;
+//
+//    T exchange(T, memory_order = memory_order::seq_cst) volatile noexcept;
+//    T exchange(T, memory_order = memory_order::seq_cst) noexcept;
+//    bool compare_exchange_weak(T&, T, memory_order, memory_order) volatile noexcept;
+//    bool compare_exchange_weak(T&, T, memory_order, memory_order) noexcept;
+//    bool compare_exchange_strong(T&, T, memory_order, memory_order) volatile noexcept;
+//    bool compare_exchange_strong(T&, T, memory_order, memory_order) noexcept;
+//    bool compare_exchange_weak(T&, T, memory_order = memory_order::seq_cst) volatile noexcept;
+//    bool compare_exchange_weak(T&, T, memory_order = memory_order::seq_cst) noexcept;
+//    bool compare_exchange_strong(T&, T, memory_order = memory_order::seq_cst) volatile noexcept;
+//    bool compare_exchange_strong(T&, T, memory_order = memory_order::seq_cst) noexcept;
+//
+//    void wait(T, memory_order = memory_order::seq_cst) const volatile noexcept;
+//    void wait(T, memory_order = memory_order::seq_cst) const noexcept;
+//    void notify_one() volatile noexcept;
+//    void notify_one() noexcept;
+//    void notify_all() volatile noexcept;
+//    void notify_all() noexcept;
+//  };
+
+#include <atomic>
+#include <type_traits>
+
+#include "operator_hijacker.h"
+#include "test_macros.h"
+
+template <class T>
+void test() {
+  T a;
+  typename T::value_type v;
+#if TEST_STD_VER >= 20
+  std::memory_order m = std::memory_order::seq_cst;
+#else
+  std::memory_order m = std::memory_order_seq_cst;
+#endif
+
+  TEST_IGNORE_NODISCARD a.is_lock_free();
+
+  TEST_IGNORE_NODISCARD T();
+  TEST_IGNORE_NODISCARD T(v);
+
+  TEST_IGNORE_NODISCARD a.load();
+  TEST_IGNORE_NODISCARD static_cast<typename T::value_type>(a);
+  a.store(v);
+  a = v;
+
+  TEST_IGNORE_NODISCARD a.exchange(v);
+  TEST_IGNORE_NODISCARD a.compare_exchange_weak(v, v, m, m);
+  TEST_IGNORE_NODISCARD a.compare_exchange_strong(v, v, m, m);
+  TEST_IGNORE_NODISCARD a.compare_exchange_weak(v, v);
+  TEST_IGNORE_NODISCARD a.compare_exchange_strong(v, v, m);
+
+  a.wait(v);
+  a.notify_one();
+  a.notify_all();
+}
+
+void test() {
+  test<std::atomic<operator_hijacker>>();
+  test<volatile std::atomic<operator_hijacker>>();
+}
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral.pass.cpp
index 34559f0..058db2d 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral.pass.cpp
@@ -84,8 +84,9 @@
 // };
 
 #include <atomic>
-#include <new>
 #include <cassert>
+#include <cstdint>
+#include <new>
 
 #include <cmpxchg_loop.h>
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
index 92bef95..5e52cde 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
@@ -64,8 +64,8 @@
     static_assert((std::is_same<std::atomic<char32_t>, std::atomic_char32_t>::value), "");
 
 //  Added by LWG 2441
-    static_assert((std::is_same<std::atomic<intptr_t>,  std::atomic_intptr_t>::value), "");
-    static_assert((std::is_same<std::atomic<uintptr_t>, std::atomic_uintptr_t>::value), "");
+    static_assert((std::is_same<std::atomic<std::intptr_t>,  std::atomic_intptr_t>::value), "");
+    static_assert((std::is_same<std::atomic<std::uintptr_t>, std::atomic_uintptr_t>::value), "");
 
     static_assert((std::is_same<std::atomic<int8_t>,    std::atomic_int8_t>::value), "");
     static_assert((std::is_same<std::atomic<uint8_t>,   std::atomic_uint8_t>::value), "");
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp
new file mode 100644
index 0000000..9049bea
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp
@@ -0,0 +1,131 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+
+// XFAIL: availability-synchronization_library-missing
+
+// <atomic>
+
+// Tests the basic features and makes sure they work with a hijacking operator&.
+
+//  template<class T> struct atomic<T*> {
+//    using value_type = T*;
+//    using difference_type = ptrdiff_t;
+//
+//    static constexpr bool is_always_lock_free = implementation-defined;
+//    bool is_lock_free() const volatile noexcept;
+//    bool is_lock_free() const noexcept;
+//
+//    constexpr atomic() noexcept;
+//    constexpr atomic(T*) noexcept;
+//    atomic(const atomic&) = delete;
+//    atomic& operator=(const atomic&) = delete;
+//    atomic& operator=(const atomic&) volatile = delete;
+//
+//    void store(T*, memory_order = memory_order::seq_cst) volatile noexcept;
+//    void store(T*, memory_order = memory_order::seq_cst) noexcept;
+//    T* operator=(T*) volatile noexcept;
+//    T* operator=(T*) noexcept;
+//    T* load(memory_order = memory_order::seq_cst) const volatile noexcept;
+//    T* load(memory_order = memory_order::seq_cst) const noexcept;
+//    operator T*() const volatile noexcept;
+//    operator T*() const noexcept;
+//
+//    T* exchange(T*, memory_order = memory_order::seq_cst) volatile noexcept;
+//    T* exchange(T*, memory_order = memory_order::seq_cst) noexcept;
+//    bool compare_exchange_weak(T*&, T*, memory_order, memory_order) volatile noexcept;
+//    bool compare_exchange_weak(T*&, T*, memory_order, memory_order) noexcept;
+//    bool compare_exchange_strong(T*&, T*, memory_order, memory_order) volatile noexcept;
+//    bool compare_exchange_strong(T*&, T*, memory_order, memory_order) noexcept;
+//    bool compare_exchange_weak(T*&, T*,
+//                               memory_order = memory_order::seq_cst) volatile noexcept;
+//    bool compare_exchange_weak(T*&, T*,
+//                               memory_order = memory_order::seq_cst) noexcept;
+//    bool compare_exchange_strong(T*&, T*,
+//                                 memory_order = memory_order::seq_cst) volatile noexcept;
+//    bool compare_exchange_strong(T*&, T*,
+//                                 memory_order = memory_order::seq_cst) noexcept;
+//
+//    T* fetch_add(ptrdiff_t, memory_order = memory_order::seq_cst) volatile noexcept;
+//    T* fetch_add(ptrdiff_t, memory_order = memory_order::seq_cst) noexcept;
+//    T* fetch_sub(ptrdiff_t, memory_order = memory_order::seq_cst) volatile noexcept;
+//    T* fetch_sub(ptrdiff_t, memory_order = memory_order::seq_cst) noexcept;
+//
+//    T* operator++(int) volatile noexcept;
+//    T* operator++(int) noexcept;
+//    T* operator--(int) volatile noexcept;
+//    T* operator--(int) noexcept;
+//    T* operator++() volatile noexcept;
+//    T* operator++() noexcept;
+//    T* operator--() volatile noexcept;
+//    T* operator--() noexcept;
+//    T* operator+=(ptrdiff_t) volatile noexcept;
+//    T* operator+=(ptrdiff_t) noexcept;
+//    T* operator-=(ptrdiff_t) volatile noexcept;
+//    T* operator-=(ptrdiff_t) noexcept;
+//
+//    void wait(T*, memory_order = memory_order::seq_cst) const volatile noexcept;
+//    void wait(T*, memory_order = memory_order::seq_cst) const noexcept;
+//    void notify_one() volatile noexcept;
+//    void notify_one() noexcept;
+//    void notify_all() volatile noexcept;
+//    void notify_all() noexcept;
+//  };
+
+#include <atomic>
+#include <type_traits>
+
+#include "operator_hijacker.h"
+#include "test_macros.h"
+
+template <class T>
+void test() {
+  T a;
+  typename T::value_type v = nullptr;
+#if TEST_STD_VER >= 20
+  std::memory_order m = std::memory_order::seq_cst;
+#else
+  std::memory_order m = std::memory_order_seq_cst;
+#endif
+
+  TEST_IGNORE_NODISCARD a.is_lock_free();
+
+  a.store(v);
+  a = v;
+  TEST_IGNORE_NODISCARD T();
+  TEST_IGNORE_NODISCARD T(v);
+  TEST_IGNORE_NODISCARD a.load();
+  TEST_IGNORE_NODISCARD static_cast<typename T::value_type>(a);
+  TEST_IGNORE_NODISCARD* a;
+
+  TEST_IGNORE_NODISCARD a.exchange(v);
+  TEST_IGNORE_NODISCARD a.compare_exchange_weak(v, v, m, m);
+  TEST_IGNORE_NODISCARD a.compare_exchange_strong(v, v, m, m);
+  TEST_IGNORE_NODISCARD a.compare_exchange_weak(v, v);
+  TEST_IGNORE_NODISCARD a.compare_exchange_strong(v, v, m);
+
+  TEST_IGNORE_NODISCARD a.fetch_add(0);
+  TEST_IGNORE_NODISCARD a.fetch_sub(0);
+
+  TEST_IGNORE_NODISCARD a++;
+  TEST_IGNORE_NODISCARD a--;
+  TEST_IGNORE_NODISCARD++ a;
+  TEST_IGNORE_NODISCARD-- a;
+  a += 0;
+  a -= 0;
+
+  a.wait(v);
+  a.notify_one();
+  a.notify_all();
+}
+
+void test() {
+  test<std::atomic<operator_hijacker*>>();
+  test<volatile std::atomic<operator_hijacker*>>();
+}
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/standard_layout.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/standard_layout.compile.pass.cpp
index d7987ca..ca17657 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/standard_layout.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/standard_layout.compile.pass.cpp
@@ -25,10 +25,8 @@
   }
 };
 
-int main(int, char**) {
+void tests() {
   TestEachIntegralType<CheckStandardLayout>()();
   TestEachFloatingPointType<CheckStandardLayout>()();
   TestEachPointerType<CheckStandardLayout>()();
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/trivially_copyable.verify.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/trivially_copyable.verify.cpp
index 707333a..0955707 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/trivially_copyable.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.generic/trivially_copyable.verify.cpp
@@ -27,5 +27,5 @@
 
 void f() {
   NotTriviallyCopyable x(42);
-  std::atomic<NotTriviallyCopyable> a(x); // expected-error@atomic:* {{std::atomic<T> requires that 'T' be a trivially copyable type}}
+  std::atomic<NotTriviallyCopyable> a(x); // expected-error@*:* {{std::atomic<T> requires that 'T' be a trivially copyable type}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.ptr.volatile.verify.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.ptr.volatile.verify.cpp
index 2d1acb6..d85f8a8 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.ptr.volatile.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.ptr.volatile.verify.cpp
@@ -14,8 +14,7 @@
 
 #include <atomic>
 
-int main(int, char**)
-{
+void f() {
     volatile std::atomic<int*> obj1;
     std::atomic<int*> obj2;
     obj1 = obj2; // expected-error {{overload resolution selected deleted operator '='}}
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.volatile.verify.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.volatile.verify.cpp
index 07e1181..e72ccf1 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.volatile.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/copy.assign.volatile.verify.cpp
@@ -14,8 +14,7 @@
 
 #include <atomic>
 
-int main(int, char**)
-{
+void f() {
   volatile std::atomic<int> obj1;
   std::atomic<int> obj2;
   obj1 = obj2; // expected-error {{overload resolution selected deleted operator '='}}
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
index 92908bd..d22ea42 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
index 5f8afa8..fbf8952 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
index 2d4890e..f0657a5 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
index 00d1ce0..0aba0a5 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/stdatomic.h.syn/types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/stdatomic.h.syn/types.compile.pass.cpp
index 5d0a285..2bac7cb 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/stdatomic.h.syn/types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/stdatomic.h.syn/types.compile.pass.cpp
@@ -200,12 +200,12 @@
   static_assert(std::is_same_v<std::atomic<int_fast64_t>,   ::atomic_int_fast64_t>);
   static_assert(std::is_same_v<std::atomic<uint_fast64_t>,  ::atomic_uint_fast64_t>);
 
-  static_assert(std::is_same_v<std::atomic<intptr_t>,  ::atomic_intptr_t>);
-  static_assert(std::is_same_v<std::atomic<uintptr_t>, ::atomic_uintptr_t>);
-  static_assert(std::is_same_v<std::atomic<size_t>,    ::atomic_size_t>);
-  static_assert(std::is_same_v<std::atomic<ptrdiff_t>, ::atomic_ptrdiff_t>);
-  static_assert(std::is_same_v<std::atomic<intmax_t>,  ::atomic_intmax_t>);
-  static_assert(std::is_same_v<std::atomic<uintmax_t>, ::atomic_uintmax_t>);
+  static_assert(std::is_same_v<std::atomic<std::intptr_t>,  ::atomic_intptr_t>);
+  static_assert(std::is_same_v<std::atomic<std::uintptr_t>, ::atomic_uintptr_t>);
+  static_assert(std::is_same_v<std::atomic<std::size_t>,    ::atomic_size_t>);
+  static_assert(std::is_same_v<std::atomic<std::ptrdiff_t>, ::atomic_ptrdiff_t>);
+  static_assert(std::is_same_v<std::atomic<std::intmax_t>,  ::atomic_intmax_t>);
+  static_assert(std::is_same_v<std::atomic<std::uintmax_t>, ::atomic_uintmax_t>);
 
   // Just check that the symbols in the global namespace are visible.
   using ::atomic_compare_exchange_strong;
diff --git a/third_party/llvm-project/libcxx/test/std/atomics/types.pass.cpp b/third_party/llvm-project/libcxx/test/std/atomics/types.pass.cpp
index f95f7a4..deaa45d 100644
--- a/third_party/llvm-project/libcxx/test/std/atomics/types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/atomics/types.pass.cpp
@@ -61,7 +61,7 @@
         A a; (void)a;
 #if TEST_STD_VER >= 17
     static_assert((std::is_same_v<typename A::value_type, decltype(a.load())>), "");
-    static_assert((std::is_same_v<typename A::difference_type, ptrdiff_t>), "");
+    static_assert((std::is_same_v<typename A::difference_type, std::ptrdiff_t>), "");
 #endif
     }
 };
@@ -119,42 +119,42 @@
     test<wchar_t>            ();
 #endif
 
-    test<int_least8_t>   ();
-    test<uint_least8_t>  ();
-    test<int_least16_t>  ();
-    test<uint_least16_t> ();
-    test<int_least32_t>  ();
-    test<uint_least32_t> ();
-    test<int_least64_t>  ();
-    test<uint_least64_t> ();
+    test<std::int_least8_t>   ();
+    test<std::uint_least8_t>  ();
+    test<std::int_least16_t>  ();
+    test<std::uint_least16_t> ();
+    test<std::int_least32_t>  ();
+    test<std::uint_least32_t> ();
+    test<std::int_least64_t>  ();
+    test<std::uint_least64_t> ();
 
-    test<int_fast8_t>   ();
-    test<uint_fast8_t>  ();
-    test<int_fast16_t>  ();
-    test<uint_fast16_t> ();
-    test<int_fast32_t>  ();
-    test<uint_fast32_t> ();
-    test<int_fast64_t>  ();
-    test<uint_fast64_t> ();
+    test<std::int_fast8_t>   ();
+    test<std::uint_fast8_t>  ();
+    test<std::int_fast16_t>  ();
+    test<std::uint_fast16_t> ();
+    test<std::int_fast32_t>  ();
+    test<std::uint_fast32_t> ();
+    test<std::int_fast64_t>  ();
+    test<std::uint_fast64_t> ();
 
-    test< int8_t>  ();
-    test<uint8_t>  ();
-    test< int16_t> ();
-    test<uint16_t> ();
-    test< int32_t> ();
-    test<uint32_t> ();
-    test< int64_t> ();
-    test<uint64_t> ();
+    test< std::int8_t>  ();
+    test<std::uint8_t>  ();
+    test< std::int16_t> ();
+    test<std::uint16_t> ();
+    test< std::int32_t> ();
+    test<std::uint32_t> ();
+    test< std::int64_t> ();
+    test<std::uint64_t> ();
 
-    test<intptr_t>  ();
-    test<uintptr_t> ();
-    test<size_t>    ();
-    test<ptrdiff_t> ();
-    test<intmax_t>  ();
-    test<uintmax_t> ();
+    test<std::intptr_t>  ();
+    test<std::uintptr_t> ();
+    test<std::size_t>    ();
+    test<std::ptrdiff_t> ();
+    test<std::intmax_t>  ();
+    test<std::uintmax_t> ();
 
-    test<uintmax_t> ();
-    test<uintmax_t> ();
+    test<std::uintmax_t> ();
+    test<std::uintmax_t> ();
 
     test<TriviallyCopyable>();
     test<PaddedTriviallyCopyable>();
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
index b58dae3..126606e 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
@@ -141,5 +141,3 @@
 static_assert(std::equality_comparable<returns_true_type>);
 static_assert(std::equality_comparable<returns_int_ptr>);
 } // namespace types_fit_for_purpose
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
index ba8138f..e0edd1f 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
@@ -1120,5 +1120,3 @@
 static_assert(
     !check_equality_comparable_with<one_way_ne, explicit_operators>());
 } // namespace types_fit_for_purpose
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.common/common_with.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.common/common_with.compile.pass.cpp
index c14634e..5d80c1c 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.common/common_with.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.common/common_with.compile.pass.cpp
@@ -990,5 +990,3 @@
     : common_type<CommonWithIntButRefLong&, int&> {};
 } // namespace std
 static_assert(CheckCommonWith<CommonWithIntButRefLong, int>());
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.commonref/common_reference.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.commonref/common_reference.compile.pass.cpp
index e7ab520..7c37daf 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.commonref/common_reference.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.commonref/common_reference.compile.pass.cpp
@@ -343,5 +343,3 @@
 } // namespace std
 static_assert(!std::common_reference_with<HasCommonReference, int>);
 static_assert(std::common_reference_with<HasCommonReference, int&>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.constructible/constructible_from.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.constructible/constructible_from.compile.pass.cpp
index 22a70bd..fe0ecec 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.constructible/constructible_from.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.constructible/constructible_from.compile.pass.cpp
@@ -148,5 +148,3 @@
   test<std::array<int, 1>, int>();
   test<std::array<int, 1>, int, int>();
 }
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.copyconstructible/copy_constructible.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.copyconstructible/copy_constructible.compile.pass.cpp
index cc349be..4a14155 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.copyconstructible/copy_constructible.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.copyconstructible/copy_constructible.compile.pass.cpp
@@ -172,5 +172,3 @@
 };
 static_assert(!std::copy_constructible<ExplicitlyCopyable>);
 } // namespace CopyConstructibleTests
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.compile.pass.cpp
index 340c29f..4921a48 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.compile.pass.cpp
@@ -261,8 +261,3 @@
     test_true     <std::weak_ptr<int>>();
 
 }
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) {
-    return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.verify.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.verify.cpp
index ec788ee..88a75d0 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.default.init/default_initializable.verify.cpp
@@ -65,9 +65,3 @@
     LIBCPP_STATIC_ASSERT(!std::__default_initializable<const int[]>);
     static_assert(!std::default_initializable<const int[]>);
 }
-
-int main(int, char**) {
-    test();
-
-    return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.destructible/destructible.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.destructible/destructible.compile.pass.cpp
index aa86f59..10c6133 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.destructible/destructible.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.destructible/destructible.compile.pass.cpp
@@ -73,6 +73,3 @@
   test<int>();
   test<double>();
 }
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.moveconstructible/move_constructible.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.moveconstructible/move_constructible.compile.pass.cpp
index b4003d9..d388248 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.moveconstructible/move_constructible.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.lang/concept.moveconstructible/move_constructible.compile.pass.cpp
@@ -76,5 +76,3 @@
 static_assert(!std::move_constructible<NonMovable>);
 static_assert(!std::move_constructible<DerivedFromNonMovable>);
 static_assert(!std::move_constructible<HasANonMovable>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/copyable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/copyable.compile.pass.cpp
index a92b6c4..accd614 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/copyable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/copyable.compile.pass.cpp
@@ -113,5 +113,3 @@
     !std::assignable_from<deleted_assignment_from_const_rvalue&,
                           deleted_assignment_from_const_rvalue const>);
 static_assert(!std::copyable<deleted_assignment_from_const_rvalue>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/movable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/movable.compile.pass.cpp
index c5879be..07a518d 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/movable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/movable.compile.pass.cpp
@@ -133,5 +133,3 @@
 
 // `move_constructible and assignable_from<T&, T>` implies `swappable<T>`,
 // so there's nothing to test for the case of non-swappable.
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/regular.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/regular.compile.pass.cpp
index b1a1709..ab5472f 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/regular.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/regular.compile.pass.cpp
@@ -163,5 +163,3 @@
   bool operator==(is_equality_comparable const&) const = default;
 };
 static_assert(std::regular<is_equality_comparable>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/semiregular.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/semiregular.compile.pass.cpp
index fed5f03..7151c1c 100644
--- a/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/semiregular.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/concepts/concepts.object/semiregular.compile.pass.cpp
@@ -126,5 +126,3 @@
 static_assert(!std::semiregular<deleted_default_ctor>);
 static_assert(!std::semiregular<derived_from_deleted_default_ctor>);
 static_assert(!std::semiregular<has_deleted_default_ctor>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.compile.fail.cpp
deleted file mode 100644
index faec5aa..0000000
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.compile.fail.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <map>
-//   The container's value type must be the same as the allocator's value type
-
-#include <map>
-
-int main(int, char**)
-{
-    std::map<int, int, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.verify.cpp
similarity index 70%
rename from third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.verify.cpp
index 47dd64e..0a33f25 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <map>
 
-int main(int, char**)
-{
-    std::multimap<int, int, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
+std::map<int, int, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/compare.three_way.pass.cpp
new file mode 100644
index 0000000..0e1c57f
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/compare.three_way.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <map>
+
+// class map
+
+// template<class Key, class T, class Compare, class Allocator>
+//   synth-three-way-result<pair<const Key, T>>
+//     operator<=>(const map<Key, T, Compare, Allocator>& x,
+//                 const map<Key, T, Compare, Allocator>& y);
+
+#include <cassert>
+#include <map>
+
+#include "test_container_comparisons.h"
+
+int main(int, char**) {
+  assert(test_ordered_map_container_spaceship<std::map>());
+  // `std::map` is not constexpr, so no `static_assert` test here.
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/empty.verify.cpp
index 1430591..27ca7c6 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <map>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::map<int, int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/max_size.pass.cpp
index b38cf11..e10f203 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.access/max_size.pass.cpp
@@ -31,7 +31,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<KV, (size_t)-1> A;
+    typedef limited_allocator<KV, (std::size_t)-1> A;
     typedef std::map<int, int, std::less<int>, A> C;
     const C::size_type max_dist =
         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
index 3fd051f..c8201e2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
@@ -42,12 +42,12 @@
     template <class U> bool operator==(const counting_allocatorT<U>& other) const noexcept { return foo == other.foo; }
     template <class U> bool operator!=(const counting_allocatorT<U>& other) const noexcept { return foo != other.foo; }
 
-    T* allocate(size_t n) const {
+    T* allocate(std::size_t n) const {
         ca_allocs.push_back(foo);
         void * const pv = ::malloc(n * sizeof(T));
         return static_cast<T *>(pv);
     }
-    void deallocate(T* p, size_t) const noexcept {
+    void deallocate(T* p, std::size_t) const noexcept {
         ca_deallocs.push_back(foo);
         free(p);
     }
@@ -65,12 +65,12 @@
     template <class U> bool operator==(const counting_allocatorF<U>& other) const noexcept { return foo == other.foo; }
     template <class U> bool operator!=(const counting_allocatorF<U>& other) const noexcept { return foo != other.foo; }
 
-    T* allocate(size_t n) const {
+    T* allocate(std::size_t n) const {
         ca_allocs.push_back(foo);
         void * const pv = ::malloc(n * sizeof(T));
         return static_cast<T *>(pv);
     }
-    void deallocate(T* p, size_t) const noexcept {
+    void deallocate(T* p, std::size_t) const noexcept {
         ca_deallocs.push_back(foo);
         free(p);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
index bcfafe8..6363016 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
@@ -166,7 +166,7 @@
                 V(3, 2),
                 V(3, 3)
             };
-            const size_t num = sizeof(a1)/sizeof(a1[0]);
+            const std::size_t num = sizeof(a1)/sizeof(a1[0]);
             assert(Counter_base::gConstructed == num);
 
             M m1(I(a1), I(a1+num), C(), A());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
index ee55466..6dfbbfe 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
@@ -30,7 +30,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
index b036531..6cdfac7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     auto some_key = c.cbegin()->first;
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
index 80e7e1f..c0ffa34 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
index 1d09443..3ef0054 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
@@ -38,7 +38,7 @@
     {
         typename Container::node_type node = nf(i, i + 1);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.verify.cpp
similarity index 70%
copy from third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.verify.cpp
index 47dd64e..122d656 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <map>
 
-int main(int, char**)
-{
-    std::multimap<int, int, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
+std::multimap<int, int, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/compare.three_way.pass.cpp
new file mode 100644
index 0000000..c7febc3
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/compare.three_way.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <map>
+
+// class multimap
+
+// template<class Key, class T, class Compare, class Allocator>
+//   synth-three-way-result<pair<const Key, T>>
+//     operator<=>(const multimap<Key, T, Compare, Allocator>& x,
+//                 const multimap<Key, T, Compare, Allocator>& y);
+
+#include <cassert>
+#include <map>
+
+#include "test_container_comparisons.h"
+
+int main(int, char**) {
+  assert(test_ordered_map_container_spaceship<std::multimap>());
+  // `std::multimap` is not constexpr, so no `static_assert` test here.
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/empty.verify.cpp
index dcd3b58..8720497 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <map>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::multimap<int, int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/max_size.pass.cpp
index a4537c3..f7b8b5e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/max_size.pass.cpp
@@ -31,7 +31,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<KV, (size_t)-1> A;
+    typedef limited_allocator<KV, (std::size_t)-1> A;
     typedef std::multimap<int, int, std::less<int>, A> C;
     const C::size_type max_dist =
         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
index a4edd47..e246842 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
@@ -165,7 +165,7 @@
                 V(3, 2),
                 V(3, 3)
             };
-            const size_t num = sizeof(a1)/sizeof(a1[0]);
+            const std::size_t num = sizeof(a1)/sizeof(a1[0]);
             assert(Counter_base::gConstructed == num);
 
             M m1(I(a1), I(a1+num), C(), A());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
index f270c4e..89ab932 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
@@ -30,7 +30,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
index c5f5b4d..c4751d8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     auto some_key = c.cbegin()->first;
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
index 891e78c..b558f4e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
index d4ba115..68e6b8b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
@@ -37,7 +37,7 @@
     {
         typename Container::node_type node = nf(i, i + 1);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.compile.fail.cpp
deleted file mode 100644
index 86e1b30..0000000
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.compile.fail.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <set>
-//   The container's value type must be the same as the allocator's value type
-
-#include <set>
-
-int main(int, char**)
-{
-    std::multiset<int, std::less<int>, std::allocator<long> > ms;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.verify.cpp
similarity index 70%
copy from third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.verify.cpp
index 69e4935..8d45268 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <set>
 
-int main(int, char**)
-{
-    std::set<int, std::less<int>, std::allocator<long> > s;
-
-  return 0;
-}
+std::multiset<int, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/empty.verify.cpp
index 87c02e4..0de9305 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <set>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::multiset<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_iterator.pass.cpp
index bce568e..ac8c5e3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     for (auto first = c.cbegin(); first != c.cend();)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_key.pass.cpp
index d92d4ed..bad5d1b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
index 00d0b67..e5c628e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
@@ -36,7 +36,7 @@
     {
         typename Container::node_type node = nf(i);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(prev + 1 == c.size());
         assert(*it == i);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/max_size.pass.cpp
index 5986df2..09faf8f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/max_size.pass.cpp
@@ -30,7 +30,7 @@
       LIBCPP_ASSERT(c.max_size() == 10);
     }
     {
-      typedef limited_allocator<int, (size_t)-1> A;
+      typedef limited_allocator<int, (std::size_t)-1> A;
       typedef std::multiset<int, std::less<int>, A> C;
       const C::size_type max_dist =
           static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
index d279dba..090be76 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
@@ -160,7 +160,7 @@
             V(3),
             V(3)
             };
-            const size_t num = sizeof(a1)/sizeof(a1[0]);
+            const std::size_t num = sizeof(a1)/sizeof(a1[0]);
             assert(Counter_base::gConstructed == num);
 
             M m1(I(a1), I(a1+num), C(), A());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
index f397975..476f4f5 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.verify.cpp
similarity index 71%
rename from third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.verify.cpp
index 69e4935..eac40e0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <set>
 
-int main(int, char**)
-{
-    std::set<int, std::less<int>, std::allocator<long> > s;
-
-  return 0;
-}
+std::set<int, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/empty.verify.cpp
index 0e7b28d..e0405f7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <set>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::set<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_iterator.pass.cpp
index 91b97fc..c6ef113 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     for (auto first = c.cbegin(); first != c.cend();)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_key.pass.cpp
index 90ebbb7..f37665b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
index d58cbe3..6f4cbe9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
@@ -37,7 +37,7 @@
     {
         typename Container::node_type node = nf(i);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/max_size.pass.cpp
index e37bfe7..f921378 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/max_size.pass.cpp
@@ -30,7 +30,7 @@
       LIBCPP_ASSERT(c.max_size() == 10);
     }
     {
-      typedef limited_allocator<int, (size_t)-1> A;
+      typedef limited_allocator<int, (std::size_t)-1> A;
       typedef std::set<int, std::less<int>, A> C;
       const C::size_type max_dist =
           static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/range_concept_conformance.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/range_concept_conformance.compile.pass.cpp
index 597abbd..16f4de9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/range_concept_conformance.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/range_concept_conformance.compile.pass.cpp
@@ -32,7 +32,7 @@
 static_assert(std::ranges::bidirectional_range<range const>);
 static_assert(!std::ranges::random_access_range<range const>);
 static_assert(std::ranges::common_range<range const>);
-static_assert(std::ranges::input_range<range>);
+static_assert(std::ranges::input_range<range const>);
 static_assert(!std::ranges::view<range const>);
 static_assert(std::ranges::sized_range<range const>);
 static_assert(!std::ranges::borrowed_range<range const>);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
index 59d536e..886cad9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
@@ -160,7 +160,7 @@
             V(3),
             V(3)
             };
-            const size_t num = sizeof(a1)/sizeof(a1[0]);
+            const std::size_t num = sizeof(a1)/sizeof(a1[0]);
             assert(Counter_base::gConstructed == num);
 
             M m1(I(a1), I(a1+num), C(), A());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
index 4c90955..2e0f026 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/check_consecutive.h b/third_party/llvm-project/libcxx/test/std/containers/check_consecutive.h
index 5f549c6..0fe46e7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/check_consecutive.h
+++ b/third_party/llvm-project/libcxx/test/std/containers/check_consecutive.h
@@ -18,9 +18,9 @@
 
 // Check consecutive equal values in an unordered_multiset iterator
 template <typename Iter>
-void CheckConsecutiveValues(Iter pos, Iter end, typename Iter::value_type value, size_t count)
+void CheckConsecutiveValues(Iter pos, Iter end, typename Iter::value_type value, std::size_t count)
 {
-    for ( size_t i = 0; i < count; ++i )
+    for ( std::size_t i = 0; i < count; ++i )
     {
         assert(pos != end);
         assert(*pos == value);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
index 7806576..e7f812c 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
@@ -35,13 +33,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.tests.h
index 489de3a..584ac2b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.tests.h
@@ -250,6 +250,14 @@
   test_char_escaped_string<CharT>(
       check, check_exception, std::priority_queue{input.begin(), input.end(), std::greater{}});
   test_char_escaped_string<CharT>(check, check_exception, std::stack{input.begin(), input.end()});
+
+  // LWG3881 fixes formatting container adaptors backed by a std::string.
+  test_char_default<CharT>(check, check_exception, std::queue{std::basic_string<CharT>{input.begin(), input.end()}});
+  test_char_default<CharT>(
+      check,
+      check_exception,
+      std::priority_queue{std::greater{}, std::basic_string<CharT>{input.begin(), input.end()}});
+  test_char_default<CharT>(check, check_exception, std::stack{std::basic_string<CharT>{input.begin(), input.end()}});
 }
 
 //
@@ -399,8 +407,7 @@
 void test_bool(TestFunction check, ExceptionTest check_exception) {
   std::array input{true, true, false};
   test_bool<CharT>(check, check_exception, std::queue{input.begin(), input.end()});
-  // TODO FMT Use std::vector<bool> after it has been implemented.
-  test_bool<CharT>(check, check_exception, std::priority_queue<bool, std::deque<bool>>{input.begin(), input.end()});
+  test_bool<CharT>(check, check_exception, std::priority_queue{input.begin(), input.end()});
   test_bool<CharT>(check, check_exception, std::stack{input.begin(), input.end()});
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
index 27c52fa..408b6f7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
@@ -32,13 +30,14 @@
 #include "format.functions.tests.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -46,20 +45,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch (const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
index 8950ece..9f978eb 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
 // following formatter specialization where adaptor-type is the name of the
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
index b620279..c8ed123 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
 // following formatter specialization where adaptor-type is the name of the
@@ -43,30 +39,30 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class Arg, class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<Arg, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
-  test_parse<std::queue<int>>(fmt);
-  test_parse<std::priority_queue<int>>(fmt);
-  test_parse<std::stack<int>>(fmt);
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
+  test_parse<std::queue<int>>(fmt, offset);
+  test_parse<std::priority_queue<int>>(fmt, offset);
+  test_parse<std::stack<int>>(fmt, offset);
 }
 
 template <class CharT>
 constexpr void test_fmt() {
-  test_parse(SV(""));
-  test_parse(SV(":d"));
+  test_parse(SV(""), 0);
+  test_parse(SV(":d"), 0);
 
-  test_parse(SV("}"));
-  test_parse(SV(":d}"));
+  test_parse(SV("}"), 1);
+  test_parse(SV(":d}"), 1);
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.verify.cpp
index 7976b96..793f47d 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <queue>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::priority_queue<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/queue/queue.defn/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/queue/queue.defn/empty.verify.cpp
index 9a8761a..5f24ef0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/queue/queue.defn/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/queue/queue.defn/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <queue>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::queue<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/stack/stack.defn/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/stack/stack.defn/empty.verify.cpp
index 8264092..e9af144 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/stack/stack.defn/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/container.adaptors/stack/stack.defn/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <stack>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::stack<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
index 89f08e1..9898880 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: no-filesystem
-
-// std::filesystem is unavailable prior to macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: availability-filesystem-missing
 
 // Make sure the various containers' iterators are not broken by the use of `std::rel_ops`.
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/array.special/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/array.special/swap.pass.cpp
index 617641d..9497429 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/array.special/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/array.special/swap.pass.cpp
@@ -12,6 +12,7 @@
 
 #include <array>
 #include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/contiguous.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/contiguous.pass.cpp
index 9589e63..85e6ed7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/contiguous.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/contiguous.pass.cpp
@@ -12,13 +12,14 @@
 
 #include <array>
 #include <cassert>
+#include <memory>
 
 #include "test_macros.h"
 
 template <class Container>
 TEST_CONSTEXPR_CXX14 void assert_contiguous(Container const& c)
 {
-    for (size_t i = 0; i < c.size(); ++i)
+    for (std::size_t i = 0; i < c.size(); ++i)
         assert(*(c.begin() + i) == *(std::addressof(*c.begin()) + i));
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/empty.verify.cpp
index 6fa851f..9cf8f11 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/empty.verify.cpp
@@ -16,15 +16,9 @@
 
 #include <array>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-
+void f() {
     std::array<int, 1> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::array<int, 0> c0;
     c0.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/size_and_alignment.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/size_and_alignment.pass.cpp
index 2422156..6fbc844 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/array/size_and_alignment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/array/size_and_alignment.pass.cpp
@@ -25,12 +25,12 @@
 
 #include "test_macros.h"
 
-template <class T, size_t Size>
+template <class T, std::size_t Size>
 struct MyArray {
   T elems[Size];
 };
 
-template <class T, size_t Size>
+template <class T, std::size_t Size>
 void test() {
   typedef T CArrayT[Size == 0 ? 1 : Size];
   typedef std::array<T, Size> ArrayT;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/abi.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/abi.compile.pass.cpp
index 74cbfe3..37e87d5 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/abi.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/abi.compile.pass.cpp
@@ -14,7 +14,7 @@
 
 template <class T>
 class small_pointer {
-  uint16_t offset;
+  std::uint16_t offset;
 };
 
 template <class T>
@@ -22,8 +22,8 @@
 public:
   using value_type      = T;
   using pointer         = small_pointer<T>;
-  using size_type       = int16_t;
-  using difference_type = int16_t;
+  using size_type       = std::int16_t;
+  using difference_type = std::int16_t;
 
   small_iter_allocator() TEST_NOEXCEPT {}
 
@@ -82,5 +82,5 @@
 static_assert(TEST_ALIGNOF(std::deque<char, small_iter_allocator<char> >) == 2, "");
 
 #else
-#  error size_t has an unexpected size
+#  error std::size_t has an unexpected size
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.verify.cpp
similarity index 72%
rename from third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.verify.cpp
index 287faf7..6e1310d 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <deque>
 
-int main(int, char**)
-{
-    std::deque<int, std::allocator<long> > d;
-
-  return 0;
-}
+std::deque<int, std::allocator<long> > d;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/compare.three_way.pass.cpp
new file mode 100644
index 0000000..3d5646a
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/compare.three_way.pass.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <deque>
+
+// template<class T, class Allocator>
+//   synth-three-way-result<T> operator<=>(const deque<T, Allocator>& x,
+//                                         const deque<T, Allocator>& y);
+
+#include <cassert>
+#include <deque>
+
+#include "test_container_comparisons.h"
+
+int main(int, char**) {
+  assert(test_sequence_container_spaceship<std::deque>());
+  // `std::deque` is not constexpr, so no `static_assert` test here.
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/empty.verify.cpp
index 01822e2..a229508 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <deque>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::deque<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
index 230a465..7e2f72e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
@@ -27,7 +27,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<int, (size_t)-1> A;
+    typedef limited_allocator<int, (std::size_t)-1> A;
     typedef std::deque<int, A> C;
     const C::size_type max_dist =
         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
index 5bb3dc9..88672fa 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
index 8dfcebd..88fce25 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
@@ -25,7 +25,7 @@
     typedef T value_type;
     some_alloc(const some_alloc&);
     ~some_alloc() noexcept(false);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
index a87c8e0..cbefbf6 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
@@ -29,7 +29,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
index d90dd81..add19ec 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
index 4c5a14e..656884a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class S, class U>
-void test0(S s, U val, S expected, size_t expected_erased_count) {
+void test0(S s, U val, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
   assert(expected_erased_count == std::erase(s, val));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
index 7f6e4c5..57657e4 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
index 4c82b51..0ac48aa 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
@@ -21,7 +21,7 @@
 #include "test_macros.h"
 
 template <typename C>
-void del_at_start(C c, size_t num)
+void del_at_start(C c, std::size_t num)
 {
     typename C::iterator first = c.begin();
     typename C::iterator last  = first + num;
@@ -41,7 +41,7 @@
 }
 
 template <typename C>
-void del_at_end(C c, size_t num)
+void del_at_end(C c, std::size_t num)
 {
     typename C::iterator last  = c.end();
     typename C::iterator first = last - num;
@@ -69,7 +69,7 @@
 
     while (queue.size() > 1)
     {
-        for (size_t i = 1; i < queue.size(); ++i)
+        for (std::size_t i = 1; i < queue.size(); ++i)
         {
             del_at_start(queue, i);
             del_at_end  (queue, i);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
index 4ce47f0..d6257b1 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
@@ -34,7 +34,7 @@
 
     some_alloc() {}
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::true_type propagate_on_container_swap;
@@ -47,7 +47,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_swap;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.verify.cpp
similarity index 72%
rename from third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.verify.cpp
index 42fb8da..617c006 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <forward_list>
 
-int main(int, char**)
-{
-    std::forward_list<int, std::allocator<long> > fl;
-
-  return 0;
-}
+std::forward_list<int, std::allocator<long> > fl;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/compare.three_way.pass.cpp
new file mode 100644
index 0000000..52adfc4
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/compare.three_way.pass.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <forward_list>
+
+// template<class T, class Allocator>
+//   synth-three-way-result<T> operator<=>(const forward_list<T, Allocator>& x,
+//                                         const forward_list<T, Allocator>& y);
+
+#include <cassert>
+#include <forward_list>
+
+#include "test_container_comparisons.h"
+
+int main(int, char**) {
+  assert(test_sequence_container_spaceship<std::forward_list>());
+  // `std::forward_list` is not constexpr, so no `static_assert` test here.
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/empty.verify.cpp
index 4092f44..366094b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <forward_list>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::forward_list<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
index 772a985..b131cc9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
index ae6fd62..db8f0d2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
@@ -25,7 +25,7 @@
     typedef T value_type;
     some_alloc(const some_alloc&);
     ~some_alloc() noexcept(false);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
index 63168c4..f361e37 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
@@ -29,7 +29,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
index edd3449..f132f0e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
index ca3931d..3c27a6d 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
@@ -37,8 +37,8 @@
 {
     { // test that the ctor is explicit
       typedef std::forward_list<DefaultOnly> C;
-      static_assert((std::is_constructible<C, size_t>::value), "");
-      static_assert((!std::is_convertible<size_t, C>::value), "");
+      static_assert((std::is_constructible<C, std::size_t>::value), "");
+      static_assert((!std::is_convertible<std::size_t, C>::value), "");
     }
     {
         typedef DefaultOnly T;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
index e6eb6f4..df9aa41 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class S, class U>
-void test0(S s, U val, S expected, size_t expected_erased_count) {
+void test0(S s, U val, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
   assert(expected_erased_count == std::erase(s, val));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
index 21de03a..756febd 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.pass.cpp
index cb30b03..6e73b2f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.pass.cpp
@@ -68,7 +68,7 @@
     c1.merge(c2);
     assert(c2.empty());
 
-    for (size_t i = 0; i < 3; ++i) {
+    for (std::size_t i = 0; i < 3; ++i) {
       assert(to[i] == *io[i]);
 #if TEST_STD_VER >= 11
       assert(to[i] == ro[i].get());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.pass.cpp
index d8df4eb..fddf9f9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.pass.cpp
@@ -68,7 +68,7 @@
     c1.merge(c2, std::greater<T>());
     assert(c2.empty());
 
-    for (size_t i = 0; i < 3; ++i) {
+    for (std::size_t i = 0; i < 3; ++i) {
       assert(to[i] == *io[i]);
 #if TEST_STD_VER >= 11
       assert(to[i] == ro[i].get());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.pass.cpp
index f6db686..3a7a874 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.pass.cpp
@@ -65,7 +65,7 @@
     c1.merge(std::move(c2));
     assert(c2.empty());
 
-    for (size_t i = 0; i < 3; ++i) {
+    for (std::size_t i = 0; i < 3; ++i) {
       assert(to[i] == *io[i]);
       assert(to[i] == ro[i].get());
       assert(to[i] == *po[i]);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.pass.cpp
index 1b45946..f1ddbfb 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.pass.cpp
@@ -65,7 +65,7 @@
     c1.merge(std::move(c2), std::greater<T>());
     assert(c2.empty());
 
-    for (size_t i = 0; i < 3; ++i) {
+    for (std::size_t i = 0; i < 3; ++i) {
       assert(to[i] == *io[i]);
       assert(to[i] == ro[i].get());
       assert(to[i] == *po[i]);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
index 7142c8a..7e26b8b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
@@ -120,7 +120,7 @@
     int a2[] = {   2,    3, 5, 8, 11};
     std::forward_list<PredLWG526> c(a1, a1 + 7);
     do_remove_if(c, std::ref(c.front()), 2);
-    for (size_t i = 0; i < 5; ++i)
+    for (std::size_t i = 0; i < 5; ++i)
     {
         assert(!c.empty());
         assert(c.front() == a2[i]);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
index 527c72c..f2ab6e5 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
@@ -19,21 +19,21 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-typedef ptrdiff_t T;
+typedef std::ptrdiff_t T;
 const T t1[] = {0, 1, 2, 3, 4, 5, 6, 7};
 const T t2[] = {10, 11, 12, 13, 14, 15};
-const ptrdiff_t size_t1 = std::end(t1) - std::begin(t1);
-const ptrdiff_t size_t2 = std::end(t2) - std::begin(t2);
+const std::ptrdiff_t size_t1 = std::end(t1) - std::begin(t1);
+const std::ptrdiff_t size_t2 = std::end(t2) - std::begin(t2);
 
 template <class C>
 void
-testd(const C& c, ptrdiff_t p, ptrdiff_t f, ptrdiff_t l)
+testd(const C& c, std::ptrdiff_t p, ptrdiff_t f, ptrdiff_t l)
 {
     typename C::const_iterator i = c.begin();
-    ptrdiff_t n1 = 0;
+    std::ptrdiff_t n1 = 0;
     for (; n1 < p; ++n1, ++i)
         assert(*i == t1[n1]);
-    for (ptrdiff_t n2 = f; n2 < l-1; ++n2, ++i)
+    for (std::ptrdiff_t n2 = f; n2 < l-1; ++n2, ++i)
         assert(*i == t2[n2]);
     for (; n1 < size_t1; ++n1, ++i)
         assert(*i == t1[n1]);
@@ -42,11 +42,11 @@
 
 template <class C>
 void
-tests(const C& c, ptrdiff_t p, ptrdiff_t f, ptrdiff_t l)
+tests(const C& c, std::ptrdiff_t p, ptrdiff_t f, ptrdiff_t l)
 {
     typename C::const_iterator i = c.begin();
-    ptrdiff_t n = 0;
-    ptrdiff_t d = l > f+1 ? l-1-f : 0;
+    std::ptrdiff_t n = 0;
+    std::ptrdiff_t d = l > f+1 ? l-1-f : 0;
     if (d == 0 || p == f)
     {
         for (n = 0; n < size_t1; ++n, ++i)
@@ -82,11 +82,11 @@
     {
     // splicing different containers
     typedef std::forward_list<T> C;
-    for (ptrdiff_t f = 0; f <= size_t2+1; ++f)
+    for (std::ptrdiff_t f = 0; f <= size_t2+1; ++f)
     {
-        for (ptrdiff_t l = f; l <= size_t2+1; ++l)
+        for (std::ptrdiff_t l = f; l <= size_t2+1; ++l)
         {
-            for (ptrdiff_t p = 0; p <= size_t1; ++p)
+            for (std::ptrdiff_t p = 0; p <= size_t1; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
                 C c2(std::begin(t2), std::end(t2));
@@ -99,11 +99,11 @@
     }
 
     // splicing within same container
-    for (ptrdiff_t f = 0; f <= size_t1+1; ++f)
+    for (std::ptrdiff_t f = 0; f <= size_t1+1; ++f)
     {
-        for (ptrdiff_t l = f; l <= size_t1; ++l)
+        for (std::ptrdiff_t l = f; l <= size_t1; ++l)
         {
-            for (ptrdiff_t p = 0; p <= f; ++p)
+            for (std::ptrdiff_t p = 0; p <= f; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
 
@@ -111,7 +111,7 @@
                       std::next(c1.cbefore_begin(), f), std::next(c1.cbefore_begin(), l));
                 tests(c1, p, f, l);
             }
-            for (ptrdiff_t p = l; p <= size_t1; ++p)
+            for (std::ptrdiff_t p = l; p <= size_t1; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
 
@@ -126,11 +126,11 @@
     {
     // splicing different containers
     typedef std::forward_list<T, min_allocator<T>> C;
-    for (ptrdiff_t f = 0; f <= size_t2+1; ++f)
+    for (std::ptrdiff_t f = 0; f <= size_t2+1; ++f)
     {
-        for (ptrdiff_t l = f; l <= size_t2+1; ++l)
+        for (std::ptrdiff_t l = f; l <= size_t2+1; ++l)
         {
-            for (ptrdiff_t p = 0; p <= size_t1; ++p)
+            for (std::ptrdiff_t p = 0; p <= size_t1; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
                 C c2(std::begin(t2), std::end(t2));
@@ -143,11 +143,11 @@
     }
 
     // splicing within same container
-    for (ptrdiff_t f = 0; f <= size_t1+1; ++f)
+    for (std::ptrdiff_t f = 0; f <= size_t1+1; ++f)
     {
-        for (ptrdiff_t l = f; l <= size_t1; ++l)
+        for (std::ptrdiff_t l = f; l <= size_t1; ++l)
         {
-            for (ptrdiff_t p = 0; p <= f; ++p)
+            for (std::ptrdiff_t p = 0; p <= f; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
 
@@ -155,7 +155,7 @@
                       std::next(c1.cbefore_begin(), f), std::next(c1.cbefore_begin(), l));
                 tests(c1, p, f, l);
             }
-            for (ptrdiff_t p = l; p <= size_t1; ++p)
+            for (std::ptrdiff_t p = l; p <= size_t1; ++p)
             {
                 C c1(std::begin(t1), std::end(t1));
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
index bfadd6f..aed12da 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
@@ -105,7 +105,7 @@
     int a2[] = {1,       2, 3, 5, 2, 11};
     std::forward_list<PredLWG526> c1(a1, a1 + 8);
     do_unique(c1, std::ref(c1.front()), 2);
-    for (size_t i = 0; i < 6; ++i)
+    for (std::size_t i = 0; i < 6; ++i)
     {
         assert(!c1.empty());
         assert(c1.front() == a2[i]);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
index e9450ec..b456883 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
@@ -35,7 +35,7 @@
 
     some_alloc() {}
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::true_type propagate_on_container_swap;
@@ -48,7 +48,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_swap;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/max_size.pass.cpp
index 08d21d6..c5145fd 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/forwardlist/max_size.pass.cpp
@@ -28,7 +28,7 @@
       LIBCPP_ASSERT(c.max_size() == 10);
     }
     {
-      typedef limited_allocator<int, (size_t)-1> A;
+      typedef limited_allocator<int, (std::size_t)-1> A;
       typedef std::forward_list<int, A> C;
       const C::size_type max_dist =
           static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.verify.cpp
similarity index 72%
rename from third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.verify.cpp
index 39dcde4..9a850a7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <list>
 
-int main(int, char**)
-{
-    std::list<int, std::allocator<long> > l;
-
-  return 0;
-}
+std::list<int, std::allocator<long> > l;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/compare.three_way.pass.cpp
new file mode 100644
index 0000000..059fba3
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/compare.three_way.pass.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <list>
+
+// template <class T, class Allocator> constexpr
+//   synth-three-way-result<T>
+//     operator<=>(const list<T, Allocator>& x, const list<T, Allocator>& y);
+
+#include <list>
+#include <cassert>
+
+#include "test_container_comparisons.h"
+
+int main(int, char**) {
+  assert(test_sequence_container_spaceship<std::list>());
+  // `std::list` is not constexpr, so no `static_assert` test here.
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/empty.verify.cpp
index 4edf426..77d4e5a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <list>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::list<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
index 8560a6a..c39fefe 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
@@ -27,7 +27,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<int, (size_t)-1> A;
+    typedef limited_allocator<int, (std::size_t)-1> A;
     typedef std::list<int, A> C;
     const C::size_type max_dist =
         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
index d34efac..f212257 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
index a6c9a83..ae7e264 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
@@ -25,7 +25,7 @@
     typedef T value_type;
     some_alloc(const some_alloc&);
     ~some_alloc() noexcept(false);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
index daa2410..9df8413 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
@@ -29,7 +29,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
index 6c1c89c..5c0b4c2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
index 6b08308..977cf24 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class S, class U>
-void test0(S s, U val, S expected, size_t expected_erased_count) {
+void test0(S s, U val, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
   assert(expected_erased_count == std::erase(s, val));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
index b6670cb..db8fd8b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
index b8503ef..c57d81b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
@@ -77,7 +77,7 @@
     std::list<PredLWG526> c(a1, a1 + 7);
     c.remove_if(std::ref(c.front()));
     assert(c.size() == 5);
-    for (size_t i = 0; i < c.size(); ++i)
+    for (std::size_t i = 0; i < c.size(); ++i)
     {
         assert(c.front() == a2[i]);
         c.pop_front();
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
index a33cad8..e107254 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
@@ -59,7 +59,7 @@
     c.unique(std::ref(c.front()));
 #endif
     assert(c.size() == 6);
-    for (size_t i = 0; i < c.size(); ++i)
+    for (std::size_t i = 0; i < c.size(); ++i)
     {
         assert(c.front() == a2[i]);
         c.pop_front();
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
index 228d3ef..ae76236 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
@@ -34,7 +34,7 @@
 
     some_alloc() {}
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::true_type propagate_on_container_swap;
@@ -47,7 +47,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_swap;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/empty.verify.cpp
index 06c968e..167e095 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <vector>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::vector<bool> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
index d4756cd..d3e1297 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
@@ -57,7 +57,7 @@
     {
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         bool a[] = {1, 0, 0, 1, 1};
         const unsigned N = sizeof(a)/sizeof(a[0]);
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, forward_iterator<const bool*>(a),
@@ -76,7 +76,7 @@
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
         v.pop_back(); v.pop_back(); v.pop_back();
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         bool a[] = {1, 0, 0, 1, 1};
         const unsigned N = sizeof(a)/sizeof(a[0]);
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, forward_iterator<const bool*>(a),
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
index feea188..484c57e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
@@ -36,7 +36,7 @@
     {
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
         assert(v.size() == sz + 5);
         assert(i == v.begin() + 10);
@@ -52,7 +52,7 @@
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
         v.pop_back(); v.pop_back();
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
         assert(v.size() == sz + 5);
         assert(i == v.begin() + 10);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
index b9a926e..bb59de3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
@@ -35,7 +35,7 @@
     {
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, 1);
         assert(v.size() == sz + 1);
         assert(i == v.begin() + 10);
@@ -50,7 +50,7 @@
         std::vector<bool> v(100);
         while(v.size() < v.capacity()) v.push_back(false);
         v.pop_back(); v.pop_back();
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<bool>::iterator i = v.insert(v.cbegin() + 10, 1);
         assert(v.size() == sz + 1);
         assert(i == v.begin() + 10);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
index 61cbfea..c1fe1bb 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <vector>
 
 // template<class T, class charT>
@@ -29,13 +32,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.tests.h
index 32b68b8..4f17a99 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.tests.h
@@ -14,9 +14,7 @@
 #include "test_macros.h"
 
 template <class CharT, class TestFunction, class ExceptionTest>
-void format_tests(TestFunction check, ExceptionTest check_exception) {
-  std::vector input{true, true, false};
-
+void format_test_vector_bool(TestFunction check, ExceptionTest check_exception, auto&& input) {
   check(SV("[true, true, false]"), SV("{}"), input);
 
   // ***** underlying has no format-spec
@@ -113,4 +111,15 @@
   check_exception("Argument index out of bounds", SV("{:^^{}::>{}}"), input, 32);
 }
 
+template <class CharT, class TestFunction, class ExceptionTest>
+void format_tests(TestFunction check, ExceptionTest check_exception) {
+  format_test_vector_bool<CharT>(check, check_exception, std::vector{true, true, false});
+
+  // The const_reference shall be a bool.
+  // However libc++ uses a __bit_const_reference<vector> when
+  // _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL is defined.
+  const std::vector input{true, true, false};
+  format_test_vector_bool<CharT>(check, check_exception, input);
+}
+
 #endif // TEST_STD_CONTAINERS_SEQUENCES_VECTOR_BOOL_VECTOR_BOOL_FMT_FORMAT_FUNCTIONS_TESTS_H
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
index 9e6db80..20a7ddf 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <vector>
 
@@ -30,13 +28,14 @@
 #include "format.functions.tests.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -44,20 +43,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch (const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
index acb517a..e20ea9b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <vector>
 
 // template<class T, class charT>
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
index c099cfe..1851b83 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <vector>
 
 // template<class T, class charT>
@@ -40,23 +36,23 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<std::vector<bool, std::allocator<bool>>::reference, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class CharT>
 constexpr void test_fmt() {
-  test_parse(SV(""));
-  test_parse(SV("b"));
+  test_parse(SV(""), 0);
+  test_parse(SV("b"), 0);
 
-  test_parse(SV("}"));
-  test_parse(SV("b}"));
+  test_parse(SV("}"), 1);
+  test_parse(SV("b}"), 1);
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/access.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/access.pass.cpp
index 5989f1e..026cf92 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/access.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/access.pass.cpp
@@ -116,6 +116,7 @@
     test<std::vector<int> >();
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int> > >();
+    test<std::vector<int, safe_allocator<int> > >();
 #endif
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.verify.cpp
similarity index 72%
rename from third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.verify.cpp
index 0c57f16..d9619f2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <vector>
 
-int main(int, char**)
-{
-    std::vector<int, std::allocator<long> > v;
-
-  return 0;
-}
+std::vector<int, std::allocator<long> > v;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/contiguous.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/contiguous.pass.cpp
index d9f557e..3c992ba 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/contiguous.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/contiguous.pass.cpp
@@ -20,7 +20,7 @@
 template <class C>
 TEST_CONSTEXPR_CXX20 void test_contiguous(const C &c)
 {
-    for ( size_t i = 0; i < c.size(); ++i )
+    for ( std::size_t i = 0; i < c.size(); ++i )
         assert ( *(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
 }
 
@@ -48,6 +48,13 @@
     test_contiguous(C(A{}));
     test_contiguous(C(9, 11.0, A{}));
     }
+    {
+      typedef double T;
+      typedef safe_allocator<T> A;
+      typedef std::vector<T, A> C;
+      test_contiguous(C(A{}));
+      test_contiguous(C(9, 11.0, A{}));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
index cc5f3bc..ad4d7b3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
@@ -40,6 +40,16 @@
     c.clear();
     assert(c.empty());
     }
+    {
+      typedef std::vector<int, safe_allocator<int>> C;
+      C c;
+      ASSERT_NOEXCEPT(c.empty());
+      assert(c.empty());
+      c.push_back(C::value_type(1));
+      assert(!c.empty());
+      c.clear();
+      assert(c.empty());
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.verify.cpp
index df3b496..4cea844 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <vector>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::vector<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
index 3f8d62e..33abaa0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
@@ -28,7 +28,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<int, (size_t)-1> A;
+    typedef limited_allocator<int, (std::size_t)-1> A;
     typedef std::vector<int, A> C;
     const C::size_type max_dist =
         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
index 99c4896..b8548ad 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
@@ -51,7 +51,7 @@
 #ifndef TEST_HAS_NO_EXCEPTIONS
     if (!TEST_IS_CONSTANT_EVALUATED) {
         std::vector<int> v;
-        size_t sz = v.max_size() + 1;
+        std::size_t sz = v.max_size() + 1;
 
         try {
             v.reserve(sz);
@@ -64,8 +64,8 @@
     if (!TEST_IS_CONSTANT_EVALUATED) {
         std::vector<int> v(10, 42);
         int* previous_data = v.data();
-        size_t previous_capacity = v.capacity();
-        size_t sz = v.max_size() + 1;
+        std::size_t previous_capacity = v.capacity();
+        std::size_t sz = v.max_size() + 1;
 
         try {
             v.reserve(sz);
@@ -99,6 +99,23 @@
         assert(v.capacity() == 150);
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      std::vector<int, safe_allocator<int>> v;
+      v.reserve(10);
+      assert(v.capacity() >= 10);
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      assert(v.capacity() == 100);
+      v.reserve(50);
+      assert(v.size() == 100);
+      assert(v.capacity() == 100);
+      v.reserve(150);
+      assert(v.size() == 100);
+      assert(v.capacity() == 150);
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 #ifndef TEST_HAS_NO_EXCEPTIONS
     if (!TEST_IS_CONSTANT_EVALUATED) {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
index 0b9db8e..967daf9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
@@ -78,6 +78,17 @@
         assert(v.capacity() >= 200);
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      v.resize(50);
+      assert(v.size() == 50);
+      assert(v.capacity() == 100);
+      assert(is_contiguous_container_asan_correct(v));
+      v.resize(200);
+      assert(v.size() == 200);
+      assert(v.capacity() >= 200);
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
index c019798..a880bcf 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
@@ -72,6 +72,33 @@
         assert(v.capacity() >= 200);
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      v.resize(50, 1);
+      assert(v.size() == 50);
+      assert(v.capacity() == 100);
+      assert(is_contiguous_container_asan_correct(v));
+      assert((v == std::vector<int, safe_allocator<int>>(50)));
+      v.resize(200, 1);
+      assert(v.size() == 200);
+      assert(v.capacity() >= 200);
+      assert(is_contiguous_container_asan_correct(v));
+      for (unsigned i = 0; i < 50; ++i)
+        assert(v[i] == 0);
+      for (unsigned i = 50; i < 200; ++i)
+        assert(v[i] == 1);
+    }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      v.resize(50, 1);
+      assert(v.size() == 50);
+      assert(v.capacity() == 100);
+      assert(is_contiguous_container_asan_correct(v));
+      v.resize(200, 1);
+      assert(v.size() == 200);
+      assert(v.capacity() >= 200);
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
index 3f24879..8851e2a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
@@ -57,6 +57,15 @@
         assert(v.size() == 101);
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      v.push_back(1);
+      assert(is_contiguous_container_asan_correct(v));
+      v.shrink_to_fit();
+      assert(v.capacity() == 101);
+      assert(v.size() == 101);
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
index aa41da6..f38aab1 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
@@ -57,6 +57,24 @@
     c.erase(c.begin());
     assert(c.size() == 0);
     }
+    {
+      typedef std::vector<int, safe_allocator<int>> C;
+      C c;
+      ASSERT_NOEXCEPT(c.size());
+      assert(c.size() == 0);
+      c.push_back(C::value_type(2));
+      assert(c.size() == 1);
+      c.push_back(C::value_type(1));
+      assert(c.size() == 2);
+      c.push_back(C::value_type(3));
+      assert(c.size() == 3);
+      c.erase(c.begin());
+      assert(c.size() == 2);
+      c.erase(c.begin());
+      assert(c.size() == 1);
+      c.erase(c.begin());
+      assert(c.size() == 0);
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
index 47a0435..1b2ac76 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
@@ -45,6 +45,19 @@
         assert(v2.capacity() == 100);
         assert(is_contiguous_container_asan_correct(v2));
     }
+    {
+      std::vector<int, safe_allocator<int>> v1(100);
+      std::vector<int, safe_allocator<int>> v2(200);
+      assert(is_contiguous_container_asan_correct(v1));
+      assert(is_contiguous_container_asan_correct(v2));
+      v1.swap(v2);
+      assert(v1.size() == 200);
+      assert(v1.capacity() == 200);
+      assert(is_contiguous_container_asan_correct(v1));
+      assert(v2.size() == 100);
+      assert(v2.capacity() == 100);
+      assert(is_contiguous_container_asan_correct(v2));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
index f5b461b..e0e227e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
@@ -78,6 +78,13 @@
         assert(l2 == l);
         assert(l2.get_allocator() == min_allocator<int>());
     }
+    {
+      std::vector<int, safe_allocator<int> > l(3, 2, safe_allocator<int>());
+      std::vector<int, safe_allocator<int> > l2(l, safe_allocator<int>());
+      l2 = l;
+      assert(l2 == l);
+      assert(l2.get_allocator() == safe_allocator<int>());
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
index 4daa320..9b52885 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
@@ -71,7 +71,7 @@
 
     std::vector<int> dst(10);
 
-    size_t n = dst.capacity() * 2;
+    std::size_t n = dst.capacity() * 2;
     std::vector<int> src(n);
 
     dst.assign(It(src.data()), It(src.data() + src.size()));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
index e6eba51..58081fa 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
@@ -95,6 +95,24 @@
         assert(l2.get_allocator() == lo.get_allocator());
         assert(is_contiguous_container_asan_correct(l2));
     }
+    {
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l((safe_allocator<MoveOnly>()));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > lo((safe_allocator<MoveOnly>()));
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      for (int i = 1; i <= 3; ++i) {
+        l.push_back(i);
+        lo.push_back(i);
+      }
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l2((safe_allocator<MoveOnly>()));
+      l2 = std::move(l);
+      assert(l2 == lo);
+      assert(l.empty());
+      assert(l2.get_allocator() == lo.get_allocator());
+      assert(is_contiguous_container_asan_correct(l2));
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
index 0f2fb36..5d71b8a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
@@ -81,6 +81,13 @@
       random_access_iterator<const int*>(a),
       random_access_iterator<const int*>(an));
   test<std::vector<int> >(a, an);
+  test<std::vector<int, safe_allocator<int> > >(
+      cpp17_input_iterator<const int*>(a), cpp17_input_iterator<const int*>(an));
+  test<std::vector<int, safe_allocator<int> > >(forward_iterator<const int*>(a), forward_iterator<const int*>(an));
+  test<std::vector<int, safe_allocator<int> > >(
+      bidirectional_iterator<const int*>(a), bidirectional_iterator<const int*>(an));
+  test<std::vector<int, safe_allocator<int> > >(
+      random_access_iterator<const int*>(a), random_access_iterator<const int*>(an));
 #endif
 }
 
@@ -183,8 +190,8 @@
   }
   {
     // Though the types are different, initialization can be done with `memcpy`.
-    int32_t array[1] = { -1 };
-    std::vector<uint32_t> v(array, array + 1);
+    std::int32_t array[1] = { -1 };
+    std::vector<std::uint32_t> v(array, array + 1);
     assert(v[0] == 4294967295U);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
index 5d38543..b1e34a5 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
@@ -83,6 +83,20 @@
     test<std::vector<int, min_allocator<int> > >(a, an, alloc);
     test<std::vector<int, implicit_conv_allocator<int> > >(a, an, nullptr);
   }
+  {
+    int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
+    int* an = a + sizeof(a) / sizeof(a[0]);
+    safe_allocator<int> alloc;
+    test<std::vector<int, safe_allocator<int> > >(
+        cpp17_input_iterator<const int*>(a), cpp17_input_iterator<const int*>(an), alloc);
+    test<std::vector<int, safe_allocator<int> > >(
+        forward_iterator<const int*>(a), forward_iterator<const int*>(an), alloc);
+    test<std::vector<int, safe_allocator<int> > >(
+        bidirectional_iterator<const int*>(a), bidirectional_iterator<const int*>(an), alloc);
+    test<std::vector<int, safe_allocator<int> > >(
+        random_access_iterator<const int*>(a), random_access_iterator<const int*>(an), alloc);
+    test<std::vector<int, safe_allocator<int> > >(a, an, alloc);
+  }
 #endif
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
index e4b1f43..1dc7cd9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
@@ -59,6 +59,8 @@
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int>>>(0);
     test<std::vector<int, min_allocator<int>>>(50);
+    test<std::vector<int, safe_allocator<int>>>(0);
+    test<std::vector<int, safe_allocator<int>>>(50);
 #endif
 
     return true;
@@ -76,6 +78,8 @@
 #if TEST_STD_VER >= 11
     test<std::vector<DefaultOnly, min_allocator<DefaultOnly>>>(0);
     test<std::vector<DefaultOnly, min_allocator<DefaultOnly>>>(500);
+    test<std::vector<DefaultOnly, safe_allocator<DefaultOnly>>>(0);
+    test<std::vector<DefaultOnly, safe_allocator<DefaultOnly>>>(500);
     test<std::vector<DefaultOnly, test_allocator<DefaultOnly>>>(0, test_allocator<DefaultOnly>(23));
     test<std::vector<DefaultOnly, test_allocator<DefaultOnly>>>(100, test_allocator<DefaultOnly>(23));
     assert(DefaultOnly::count == 0);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
index 7f7777c..0f24e77 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
@@ -40,6 +40,8 @@
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int>> >(0, 3);
     test<std::vector<int, min_allocator<int>> >(50, 3);
+    test<std::vector<int, safe_allocator<int>> >(0, 3);
+    test<std::vector<int, safe_allocator<int>> >(50, 3);
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
index 17d3a58..eb34de8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
@@ -37,6 +37,8 @@
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int>> >(0, 3, min_allocator<int>());
     test<std::vector<int, min_allocator<int>> >(50, 3, min_allocator<int>());
+    test<std::vector<int, safe_allocator<int>> >(0, 3, safe_allocator<int>());
+    test<std::vector<int, safe_allocator<int>> >(50, 3, safe_allocator<int>());
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.move_only.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.move_only.verify.cpp
index 9130104..f716ecc 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.move_only.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.move_only.verify.cpp
@@ -14,9 +14,7 @@
 
 #include "MoveOnly.h"
 
-int main(int, char**)
-{
+void f() {
     std::vector<MoveOnly> v;
     std::vector<MoveOnly> copy = v; // expected-error-re@* {{{{(no matching function for call to 'construct_at')|(call to implicitly-deleted copy constructor of 'MoveOnly')|(call to deleted constructor of 'MoveOnly')}}}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
index 88822e9..810ea4f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
@@ -73,6 +73,7 @@
         int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
         int* an = a + sizeof(a)/sizeof(a[0]);
         test(std::vector<int, min_allocator<int>>(a, an));
+        test(std::vector<int, safe_allocator<int>>(a, an));
     }
     {
         std::vector<int, min_allocator<int> > v(3, 2, min_allocator<int>());
@@ -84,6 +85,16 @@
         assert(is_contiguous_container_asan_correct(v));
         assert(is_contiguous_container_asan_correct(v2));
     }
+    {
+      std::vector<int, safe_allocator<int> > v(3, 2, safe_allocator<int>());
+      std::vector<int, safe_allocator<int> > v2 = v;
+      assert(is_contiguous_container_asan_correct(v));
+      assert(is_contiguous_container_asan_correct(v2));
+      assert(v2 == v);
+      assert(v2.get_allocator() == v.get_allocator());
+      assert(is_contiguous_container_asan_correct(v));
+      assert(is_contiguous_container_asan_correct(v2));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
index 70434bc..0c03c50 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
@@ -61,6 +61,7 @@
         int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
         int* an = a + sizeof(a)/sizeof(a[0]);
         test(std::vector<int, min_allocator<int>>(a, an), min_allocator<int>());
+        test(std::vector<int, safe_allocator<int>>(a, an), safe_allocator<int>());
     }
     {
         std::vector<int, min_allocator<int> > l(3, 2, min_allocator<int>());
@@ -68,6 +69,12 @@
         assert(l2 == l);
         assert(l2.get_allocator() == min_allocator<int>());
     }
+    {
+      std::vector<int, safe_allocator<int> > l(3, 2, safe_allocator<int>());
+      std::vector<int, safe_allocator<int> > l2(l, safe_allocator<int>());
+      assert(l2 == l);
+      assert(l2.get_allocator() == safe_allocator<int>());
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
index 3bd4a16..054ea64 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 TEST_CONSTEXPR_CXX20 bool tests() {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
index 7934759..1b98b75 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
@@ -25,7 +25,7 @@
     typedef T value_type;
     some_alloc(const some_alloc&);
     ~some_alloc() noexcept(false);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 TEST_CONSTEXPR_CXX20 bool tests()
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
index 6454f87..af2f3e4 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
@@ -38,6 +38,15 @@
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+    {
+      std::vector<int, safe_allocator<int>> d = {3, 4, 5, 6};
+      assert(d.size() == 4);
+      assert(is_contiguous_container_asan_correct(d));
+      assert(d[0] == 3);
+      assert(d[1] == 4);
+      assert(d[2] == 5);
+      assert(d[3] == 6);
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
index 157aefc..8396e84 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
@@ -48,6 +48,22 @@
     assert(d.empty());
     assert(is_contiguous_container_asan_correct(d));
     }
+    {
+      std::vector<int, safe_allocator<int>> d({3, 4, 5, 6}, safe_allocator<int>());
+      assert(d.get_allocator() == safe_allocator<int>());
+      assert(d.size() == 4);
+      assert(is_contiguous_container_asan_correct(d));
+      assert(d[0] == 3);
+      assert(d[1] == 4);
+      assert(d[2] == 5);
+      assert(d[3] == 6);
+    }
+    {
+      std::vector<int, safe_allocator<int>> d({}, safe_allocator<int>());
+      assert(d.size() == 0);
+      assert(d.empty());
+      assert(is_contiguous_container_asan_correct(d));
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
index 0f3e737..95b896b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
@@ -101,6 +101,34 @@
         assert(is_contiguous_container_asan_correct(c2));
     }
     {
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l((safe_allocator<MoveOnly>()));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > lo((safe_allocator<MoveOnly>()));
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      for (int i = 1; i <= 3; ++i) {
+        l.push_back(i);
+        lo.push_back(i);
+      }
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l2 = std::move(l);
+      assert(l2 == lo);
+      assert(l.empty());
+      assert(l2.get_allocator() == lo.get_allocator());
+      assert(is_contiguous_container_asan_correct(l2));
+    }
+    {
+      int a1[] = {1, 3, 7, 9, 10};
+      std::vector<int, safe_allocator<int> > c1(a1, a1 + sizeof(a1) / sizeof(a1[0]));
+      assert(is_contiguous_container_asan_correct(c1));
+      std::vector<int, safe_allocator<int> >::const_iterator i = c1.begin();
+      std::vector<int, safe_allocator<int> > c2                = std::move(c1);
+      assert(is_contiguous_container_asan_correct(c2));
+      std::vector<int, safe_allocator<int> >::iterator j = c2.erase(i);
+      assert(*j == 3);
+      assert(is_contiguous_container_asan_correct(c2));
+    }
+    {
       alloc_stats.clear();
       using Vect = std::vector<int, test_allocator<int> >;
       Vect v(test_allocator<int>(42, 101, &alloc_stats));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
index 2b6705a..fd0b995 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
@@ -94,6 +94,23 @@
         assert(l2.get_allocator() == min_allocator<MoveOnly>());
         assert(is_contiguous_container_asan_correct(l2));
     }
+    {
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l((safe_allocator<MoveOnly>()));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > lo((safe_allocator<MoveOnly>()));
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      for (int i = 1; i <= 3; ++i) {
+        l.push_back(i);
+        lo.push_back(i);
+      }
+      assert(is_contiguous_container_asan_correct(l));
+      assert(is_contiguous_container_asan_correct(lo));
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > l2(std::move(l), safe_allocator<MoveOnly>());
+      assert(l2 == lo);
+      assert(l.empty());
+      assert(l2.get_allocator() == safe_allocator<MoveOnly>());
+      assert(is_contiguous_container_asan_correct(l2));
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
index fdd74a3..f466809 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
@@ -29,7 +29,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 template <class T>
@@ -39,7 +39,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_move_assignment;
@@ -53,7 +53,7 @@
 
     some_alloc3() {}
     some_alloc3(const some_alloc3&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_move_assignment;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
index 30e9f46..c2bfa52 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
@@ -27,7 +27,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
 };
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data.pass.cpp
index 4d2cadc..64b8542 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data.pass.cpp
@@ -59,6 +59,21 @@
         assert(v.data() == std::addressof(v.front()));
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      std::vector<int, safe_allocator<int>> v;
+      assert(v.data() == 0);
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      assert(v.data() == std::addressof(v.front()));
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      std::vector<Nasty, safe_allocator<Nasty>> v(100);
+      assert(v.data() == std::addressof(v.front()));
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
index d314f90..885caf2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
@@ -59,6 +59,21 @@
         assert(v.data() == std::addressof(v.front()));
         assert(is_contiguous_container_asan_correct(v));
     }
+    {
+      const std::vector<int, safe_allocator<int>> v;
+      assert(v.data() == 0);
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      const std::vector<int, safe_allocator<int>> v(100);
+      assert(v.data() == &v.front());
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      std::vector<Nasty, safe_allocator<Nasty>> v(100);
+      assert(v.data() == std::addressof(v.front()));
+      assert(is_contiguous_container_asan_correct(v));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
index 72441c1..88b27d9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class S, class U>
-TEST_CONSTEXPR_CXX20 void test0(S s, U val, S expected, size_t expected_erased_count) {
+TEST_CONSTEXPR_CXX20 void test0(S s, U val, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
   assert(expected_erased_count == std::erase(s, val));
   assert(s == expected);
@@ -68,6 +68,7 @@
     test<std::vector<int>>();
     test<std::vector<int, min_allocator<int>>> ();
     test<std::vector<int, test_allocator<int>>> ();
+    test<std::vector<int, safe_allocator<int>>>();
 
     test<std::vector<long>>();
     test<std::vector<double>>();
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
index 1fcc1c9..015824a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
@@ -20,7 +20,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-TEST_CONSTEXPR_CXX20 void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+TEST_CONSTEXPR_CXX20 void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   assert(s == expected);
@@ -70,6 +70,7 @@
     test<std::vector<int>>();
     test<std::vector<int, min_allocator<int>>> ();
     test<std::vector<int, test_allocator<int>>> ();
+    test<std::vector<int, safe_allocator<int>>>();
 
     test<std::vector<long>>();
     test<std::vector<double>>();
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
index 5a1e134..9390b83 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
@@ -38,6 +38,15 @@
     LIBCPP_ASSERT(c.__invariants());
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
     }
+    {
+      int a[] = {1, 2, 3};
+      std::vector<int, safe_allocator<int>> c(a, a + 3);
+      ASSERT_NOEXCEPT(c.clear());
+      c.clear();
+      assert(c.empty());
+      LIBCPP_ASSERT(c.__invariants());
+      LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
index f2c656c..4f5e36a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
@@ -132,6 +132,30 @@
         assert(c.back().geti() == 3);
         assert(c.back().getd() == 4.5);
     }
+    {
+      std::vector<A, safe_allocator<A> > c;
+      std::vector<A, safe_allocator<A> >::iterator i = c.emplace(c.cbegin(), 2, 3.5);
+      assert(i == c.begin());
+      assert(c.size() == 1);
+      assert(c.front().geti() == 2);
+      assert(c.front().getd() == 3.5);
+      i = c.emplace(c.cend(), 3, 4.5);
+      assert(i == c.end() - 1);
+      assert(c.size() == 2);
+      assert(c.front().geti() == 2);
+      assert(c.front().getd() == 3.5);
+      assert(c.back().geti() == 3);
+      assert(c.back().getd() == 4.5);
+      i = c.emplace(c.cbegin() + 1, 4, 6.5);
+      assert(i == c.begin() + 1);
+      assert(c.size() == 3);
+      assert(c.front().geti() == 2);
+      assert(c.front().getd() == 3.5);
+      assert(c[1].geti() == 4);
+      assert(c[1].getd() == 6.5);
+      assert(c.back().geti() == 3);
+      assert(c.back().getd() == 4.5);
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
index bb7fa74..730ed32 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
@@ -138,6 +138,33 @@
         assert(is_contiguous_container_asan_correct(c));
     }
     {
+      std::vector<A, safe_allocator<A> > c;
+#if TEST_STD_VER > 14
+      A& r1 = c.emplace_back(2, 3.5);
+      assert(c.size() == 1);
+      assert(&r1 == &c.back());
+      assert(c.front().geti() == 2);
+      assert(c.front().getd() == 3.5);
+      assert(is_contiguous_container_asan_correct(c));
+      A& r2 = c.emplace_back(3, 4.5);
+      assert(c.size() == 2);
+      assert(&r2 == &c.back());
+#else
+        c.emplace_back(2, 3.5);
+        assert(c.size() == 1);
+        assert(c.front().geti() == 2);
+        assert(c.front().getd() == 3.5);
+        assert(is_contiguous_container_asan_correct(c));
+        c.emplace_back(3, 4.5);
+        assert(c.size() == 2);
+#endif
+        assert(c.front().geti() == 2);
+        assert(c.front().getd() == 3.5);
+        assert(c.back().geti() == 3);
+        assert(c.back().getd() == 4.5);
+        assert(is_contiguous_container_asan_correct(c));
+    }
+    {
         std::vector<Tag_X, TaggingAllocator<Tag_X> > c;
         c.emplace_back();
         assert(c.size() == 1);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
index 3e1a1d8..f186a0d 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
@@ -57,9 +57,27 @@
         assert(is_contiguous_container_asan_correct(v));
     }
     {
+      std::vector<int, safe_allocator<int>> v;
+      v.reserve(3);
+      assert(is_contiguous_container_asan_correct(v));
+      v = {1, 2, 3};
+      v.emplace(v.begin(), v.back());
+      assert(v[0] == 3);
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
+      std::vector<int, safe_allocator<int>> v;
+      v.reserve(4);
+      assert(is_contiguous_container_asan_correct(v));
+      v = {1, 2, 3};
+      v.emplace(v.begin(), v.back());
+      assert(v[0] == 3);
+      assert(is_contiguous_container_asan_correct(v));
+    }
+    {
         std::vector<int> v;
         v.reserve(8);
-        size_t old_capacity = v.capacity();
+        std::size_t old_capacity = v.capacity();
         assert(old_capacity >= 8);
 
         v.resize(4); // keep the existing capacity
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
index fe18d2d..934b85c 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
@@ -68,7 +68,7 @@
         typedef std::vector<int> V;
         V v(100);
         while(v.size() < v.capacity()) v.push_back(0); // force reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         int a[] = {1, 2, 3, 4, 5};
         const unsigned N = sizeof(a)/sizeof(a[0]);
         V::iterator i = v.insert(v.cbegin() + 10, forward_iterator<const int*>(a),
@@ -87,7 +87,7 @@
         typedef std::vector<int> V;
         V v(100);
         v.reserve(128); // force no reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         int a[] = {1, 2, 3, 4, 5};
         const unsigned N = sizeof(a)/sizeof(a[0]);
         V::iterator i = v.insert(v.cbegin() + 10, forward_iterator<const int*>(a),
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_lvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_lvalue.pass.cpp
index c8bb994..b5582df 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_lvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_lvalue.pass.cpp
@@ -36,7 +36,7 @@
             assert(v[j] == 0);
     }
     {
-        const size_t n = 100;
+        const std::size_t n = 100;
         std::vector<int> v(n);
         v.reserve(n + 1);
         const int lvalue = 1;
@@ -47,7 +47,7 @@
         assert(v.size() == n + 1);
         assert(is_contiguous_container_asan_correct(v));
         assert(it == v.begin() + n);
-        for (size_t i = 0; i < n; ++i) {
+        for (std::size_t i = 0; i < n; ++i) {
             assert(v[i] == 0);
         }
         assert(v[n] == lvalue);
@@ -55,7 +55,7 @@
     {
         std::vector<int> v(100);
         while(v.size() < v.capacity()) v.push_back(0); // force reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         const int lvalue = 1;
         std::vector<int>::iterator i = v.insert(v.cbegin() + 10, lvalue);
         assert(v.size() == sz + 1);
@@ -72,7 +72,7 @@
         std::vector<int> v(100);
         while(v.size() < v.capacity()) v.push_back(0);
         v.pop_back(); v.pop_back(); // force no reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         const int lvalue = 1;
         std::vector<int>::iterator i = v.insert(v.cbegin() + 10, lvalue);
         assert(v.size() == sz + 1);
@@ -114,6 +114,20 @@
         for (++j; j < 101; ++j)
             assert(v[j] == 0);
     }
+    {
+      std::vector<int, safe_allocator<int>> v(100);
+      const int lvalue                                  = 1;
+      std::vector<int, safe_allocator<int>>::iterator i = v.insert(v.cbegin() + 10, lvalue);
+      assert(v.size() == 101);
+      assert(is_contiguous_container_asan_correct(v));
+      assert(i == v.begin() + 10);
+      int j;
+      for (j = 0; j < 10; ++j)
+        assert(v[j] == 0);
+      assert(v[j] == 1);
+      for (++j; j < 101; ++j)
+        assert(v[j] == 0);
+    }
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
index 11a7175..4619d7a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
@@ -62,6 +62,19 @@
         for (++j; j < 101; ++j)
             assert(v[j] == MoveOnly());
     }
+    {
+      std::vector<MoveOnly, safe_allocator<MoveOnly> > v(100);
+      std::vector<MoveOnly, safe_allocator<MoveOnly> >::iterator i = v.insert(v.cbegin() + 10, MoveOnly(3));
+      assert(v.size() == 101);
+      assert(is_contiguous_container_asan_correct(v));
+      assert(i == v.begin() + 10);
+      int j;
+      for (j = 0; j < 10; ++j)
+        assert(v[j] == MoveOnly());
+      assert(v[j] == MoveOnly(3));
+      for (++j; j < 101; ++j)
+        assert(v[j] == MoveOnly());
+    }
 
     return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
index c629428..8325fcf 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
@@ -38,7 +38,7 @@
     {
         std::vector<int> v(100);
         while(v.size() < v.capacity()) v.push_back(0); // force reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<int>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
         assert(v.size() == sz + 5);
         assert(is_contiguous_container_asan_correct(v));
@@ -54,7 +54,7 @@
     {
         std::vector<int> v(100);
         v.reserve(128); // force no reallocation
-        size_t sz = v.size();
+        std::size_t sz = v.size();
         std::vector<int>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
         assert(v.size() == sz + 5);
         assert(is_contiguous_container_asan_correct(v));
@@ -97,18 +97,18 @@
             assert(v[j] == 0);
     }
     {
-        std::vector<int, min_allocator<int>> v(100);
-        std::vector<int, min_allocator<int>>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
-        assert(v.size() == 105);
-        assert(is_contiguous_container_asan_correct(v));
-        assert(i == v.begin() + 10);
-        int j;
-        for (j = 0; j < 10; ++j)
-            assert(v[j] == 0);
-        for (; j < 15; ++j)
-            assert(v[j] == 1);
-        for (++j; j < 105; ++j)
-            assert(v[j] == 0);
+      std::vector<int, safe_allocator<int>> v(100);
+      std::vector<int, safe_allocator<int>>::iterator i = v.insert(v.cbegin() + 10, 5, 1);
+      assert(v.size() == 105);
+      assert(is_contiguous_container_asan_correct(v));
+      assert(i == v.begin() + 10);
+      int j;
+      for (j = 0; j < 10; ++j)
+        assert(v[j] == 0);
+      for (; j < 15; ++j)
+        assert(v[j] == 1);
+      for (++j; j < 105; ++j)
+        assert(v[j] == 0);
     }
 #endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
index e1f4520..98aece6 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
@@ -19,6 +19,81 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
+template <typename A>
+TEST_CONSTEXPR_CXX20 void test_with_allocator() {
+  {
+    int a1[] = {1, 3, 7, 9, 10};
+    int a2[] = {0, 2, 4, 5, 6, 8, 11};
+    std::vector<int, A> c1(a1, a1 + sizeof(a1) / sizeof(a1[0]));
+    std::vector<int, A> c2(a2, a2 + sizeof(a2) / sizeof(a2[0]));
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+    swap(c1, c2);
+    assert((c1 == std::vector<int, A>(a2, a2 + sizeof(a2) / sizeof(a2[0]))));
+    assert((c2 == std::vector<int, A>(a1, a1 + sizeof(a1) / sizeof(a1[0]))));
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+  }
+  {
+    int a1[] = {1, 3, 7, 9, 10};
+    int a2[] = {0, 2, 4, 5, 6, 8, 11};
+    std::vector<int, A> c1(a1, a1);
+    std::vector<int, A> c2(a2, a2 + sizeof(a2) / sizeof(a2[0]));
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+    swap(c1, c2);
+    assert((c1 == std::vector<int, A>(a2, a2 + sizeof(a2) / sizeof(a2[0]))));
+    assert(c2.empty());
+    assert(std::distance(c2.begin(), c2.end()) == 0);
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+  }
+  {
+    int a1[] = {1, 3, 7, 9, 10};
+    int a2[] = {0, 2, 4, 5, 6, 8, 11};
+    std::vector<int, A> c1(a1, a1 + sizeof(a1) / sizeof(a1[0]));
+    std::vector<int, A> c2(a2, a2);
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+    swap(c1, c2);
+    assert(c1.empty());
+    assert(std::distance(c1.begin(), c1.end()) == 0);
+    assert((c2 == std::vector<int, A>(a1, a1 + sizeof(a1) / sizeof(a1[0]))));
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+  }
+  {
+    int a1[] = {1, 3, 7, 9, 10};
+    int a2[] = {0, 2, 4, 5, 6, 8, 11};
+    std::vector<int, A> c1(a1, a1);
+    std::vector<int, A> c2(a2, a2);
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+    swap(c1, c2);
+    assert(c1.empty());
+    assert(std::distance(c1.begin(), c1.end()) == 0);
+    assert(c2.empty());
+    assert(std::distance(c2.begin(), c2.end()) == 0);
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+  }
+  {
+    int a1[] = {1, 3, 7, 9, 10};
+    int a2[] = {0, 2, 4, 5, 6, 8, 11};
+    std::vector<int, A> c1(a1, a1 + sizeof(a1) / sizeof(a1[0]), A());
+    std::vector<int, A> c2(a2, a2 + sizeof(a2) / sizeof(a2[0]), A());
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+    swap(c1, c2);
+    assert((c1 == std::vector<int, A>(a2, a2 + sizeof(a2) / sizeof(a2[0]))));
+    assert(c1.get_allocator() == A());
+    assert((c2 == std::vector<int, A>(a1, a1 + sizeof(a1) / sizeof(a1[0]))));
+    assert(c2.get_allocator() == A());
+    assert(is_contiguous_container_asan_correct(c1));
+    assert(is_contiguous_container_asan_correct(c2));
+  }
+}
+
 TEST_CONSTEXPR_CXX20 bool tests()
 {
     {
@@ -106,78 +181,8 @@
         assert(is_contiguous_container_asan_correct(c2));
     }
 #if TEST_STD_VER >= 11
-    {
-        int a1[] = {1, 3, 7, 9, 10};
-        int a2[] = {0, 2, 4, 5, 6, 8, 11};
-        std::vector<int, min_allocator<int>> c1(a1, a1+sizeof(a1)/sizeof(a1[0]));
-        std::vector<int, min_allocator<int>> c2(a2, a2+sizeof(a2)/sizeof(a2[0]));
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-        swap(c1, c2);
-        assert((c1 == std::vector<int, min_allocator<int>>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
-        assert((c2 == std::vector<int, min_allocator<int>>(a1, a1+sizeof(a1)/sizeof(a1[0]))));
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-    }
-    {
-        int a1[] = {1, 3, 7, 9, 10};
-        int a2[] = {0, 2, 4, 5, 6, 8, 11};
-        std::vector<int, min_allocator<int>> c1(a1, a1);
-        std::vector<int, min_allocator<int>> c2(a2, a2+sizeof(a2)/sizeof(a2[0]));
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-        swap(c1, c2);
-        assert((c1 == std::vector<int, min_allocator<int>>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
-        assert(c2.empty());
-        assert(std::distance(c2.begin(), c2.end()) == 0);
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-    }
-    {
-        int a1[] = {1, 3, 7, 9, 10};
-        int a2[] = {0, 2, 4, 5, 6, 8, 11};
-        std::vector<int, min_allocator<int>> c1(a1, a1+sizeof(a1)/sizeof(a1[0]));
-        std::vector<int, min_allocator<int>> c2(a2, a2);
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-        swap(c1, c2);
-        assert(c1.empty());
-        assert(std::distance(c1.begin(), c1.end()) == 0);
-        assert((c2 == std::vector<int, min_allocator<int>>(a1, a1+sizeof(a1)/sizeof(a1[0]))));
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-    }
-    {
-        int a1[] = {1, 3, 7, 9, 10};
-        int a2[] = {0, 2, 4, 5, 6, 8, 11};
-        std::vector<int, min_allocator<int>> c1(a1, a1);
-        std::vector<int, min_allocator<int>> c2(a2, a2);
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-        swap(c1, c2);
-        assert(c1.empty());
-        assert(std::distance(c1.begin(), c1.end()) == 0);
-        assert(c2.empty());
-        assert(std::distance(c2.begin(), c2.end()) == 0);
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-    }
-    {
-        int a1[] = {1, 3, 7, 9, 10};
-        int a2[] = {0, 2, 4, 5, 6, 8, 11};
-        typedef min_allocator<int> A;
-        std::vector<int, A> c1(a1, a1+sizeof(a1)/sizeof(a1[0]), A());
-        std::vector<int, A> c2(a2, a2+sizeof(a2)/sizeof(a2[0]), A());
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-        swap(c1, c2);
-        assert((c1 == std::vector<int, A>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
-        assert(c1.get_allocator() == A());
-        assert((c2 == std::vector<int, A>(a1, a1+sizeof(a1)/sizeof(a1[0]))));
-        assert(c2.get_allocator() == A());
-        assert(is_contiguous_container_asan_correct(c1));
-        assert(is_contiguous_container_asan_correct(c2));
-    }
+    test_with_allocator<min_allocator<int>>();
+    test_with_allocator<safe_allocator<int>>();
 #endif
 
     return true;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap_noexcept.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap_noexcept.compile.pass.cpp
index 830d05c..d38a00c 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap_noexcept.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.special/swap_noexcept.compile.pass.cpp
@@ -35,7 +35,7 @@
 
     some_alloc() {}
     some_alloc(const some_alloc&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::true_type propagate_on_container_swap;
@@ -48,7 +48,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    void allocate(size_t);
+    void allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_swap;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.compile.fail.cpp
deleted file mode 100644
index 7059220..0000000
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.compile.fail.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <unordered_map>
-//   The container's value type must be the same as the allocator's value type
-
-#include <unordered_map>
-
-int main(int, char**)
-{
-    std::unordered_map<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.verify.cpp
similarity index 68%
rename from third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.verify.cpp
index ba24ca3..c8e0b8f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <unordered_map>
 
-int main(int, char**)
-{
-    std::unordered_multimap<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
+std::unordered_map<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/bucket.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/bucket.pass.cpp
index 0f2e721..14e5b2f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/bucket.pass.cpp
@@ -37,9 +37,9 @@
             P(2, "four"),
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 5);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #if TEST_STD_VER >= 11
@@ -57,9 +57,9 @@
             P(2, "four"),
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 5);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/compare.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/compare.pass.cpp
index 12364fa..200107c 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/compare.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/compare.pass.cpp
@@ -30,7 +30,7 @@
     template <>
     struct hash<Key>
     {
-        size_t operator()(Key const &) const {return 0;}
+        std::size_t operator()(Key const &) const {return 0;}
     };
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/empty.verify.cpp
index 269250b..ada96fd 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <unordered_map>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::unordered_map<int, int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/erase_if.pass.cpp
index 54a8b9b..329ead0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/erase_if.pass.cpp
@@ -31,7 +31,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/max_size.pass.cpp
index 7c2ec58..33c009b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/max_size.pass.cpp
@@ -32,7 +32,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<KV, (size_t)-1> A;
+    typedef limited_allocator<KV, (std::size_t)-1> A;
     typedef std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, A>
         C;
     const C::size_type max_dist =
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/rehash.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/rehash.pass.cpp
index c8f079f..737e40d 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/rehash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/rehash.pass.cpp
@@ -22,7 +22,7 @@
 #include "min_allocator.h"
 
 template <class C>
-void rehash_postcondition(const C& c, size_t n)
+void rehash_postcondition(const C& c, std::size_t n)
 {
     assert(c.bucket_count() >= c.size() / c.max_load_factor() && c.bucket_count() >= n);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/reserve.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/reserve.pass.cpp
index 622a969..358da35 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/reserve.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/reserve.pass.cpp
@@ -31,14 +31,14 @@
     assert(c.at(4) == "four");
 }
 
-void reserve_invariant(size_t n) // LWG #2156
+void reserve_invariant(std::size_t n) // LWG #2156
 {
-    for (size_t i = 0; i < n; ++i)
+    for (std::size_t i = 0; i < n; ++i)
     {
-        std::unordered_map<size_t, size_t> c;
+        std::unordered_map<std::size_t, size_t> c;
         c.reserve(n);
-        size_t buckets = c.bucket_count();
-        for (size_t j = 0; j < i; ++j)
+        std::size_t buckets = c.bucket_count();
+        for (std::size_t j = 0; j < i; ++j)
         {
             c[i] = i;
             assert(buckets == c.bucket_count());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
index 1d0b18b..42cc9d1 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
@@ -28,7 +28,7 @@
 };
 
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
-struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
+struct Hash { std::size_t operator() (const TemplateConstructor &) const { return 0; } };
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
index 2ce9888..ac241c0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     auto some_key = c.cbegin()->first;
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
index e1c893f..78721db 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
@@ -24,8 +24,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
index 821eec9..8677810 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
@@ -38,7 +38,7 @@
     {
         typename Container::node_type node = nf(i, i + 1);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
index 1b7c9e0..df21383 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
@@ -52,7 +52,7 @@
         {return int_ == x.int_ && double_ == x.double_;}
     bool operator<(const Moveable& x) const
         {return int_ < x.int_ || (int_ == x.int_ && double_ < x.double_);}
-    size_t hash () const { return std::hash<int>()(int_) + std::hash<double>()(double_); }
+    std::size_t hash () const { return std::hash<int>()(int_) + std::hash<double>()(double_); }
 
     int get() const {return int_;}
     bool moved() const {return int_ == -1;}
@@ -60,7 +60,7 @@
 
 namespace std {
     template <> struct hash<Moveable> {
-        size_t operator () (const Moveable &m) const { return m.hash(); }
+        std::size_t operator () (const Moveable &m) const { return m.hash(); }
     };
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
index 9953dc8..e5c29b1 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
@@ -40,7 +40,7 @@
 
     throw_hasher(bool& should_throw) : should_throw_(should_throw) {}
 
-    size_t operator()(const T& p) const
+    std::size_t operator()(const T& p) const
     {
         if (should_throw_)
             throw 0;
@@ -95,7 +95,7 @@
     struct hasher
     {
         hasher() = default;
-        size_t operator()(const Counter<int>& p) const
+        std::size_t operator()(const Counter<int>& p) const
         {
             return std::hash<Counter<int>>()(p);
         }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
index bf2c317..b9c8239 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
@@ -51,7 +51,7 @@
         {return int_ == x.int_ && double_ == x.double_;}
     bool operator<(const Moveable& x) const
         {return int_ < x.int_ || (int_ == x.int_ && double_ < x.double_);}
-    size_t hash () const { return std::hash<int>()(int_) + std::hash<double>()(double_); }
+    std::size_t hash () const { return std::hash<int>()(int_) + std::hash<double>()(double_); }
 
     int get() const {return int_;}
     bool moved() const {return int_ == -1;}
@@ -59,7 +59,7 @@
 
 namespace std {
     template <> struct hash<Moveable> {
-        size_t operator () (const Moveable &m) const { return m.hash(); }
+        std::size_t operator () (const Moveable &m) const { return m.hash(); }
     };
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.verify.cpp
similarity index 68%
copy from third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.verify.cpp
index ba24ca3..4f28dc4 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <unordered_map>
 
-int main(int, char**)
-{
-    std::unordered_multimap<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
-
-  return 0;
-}
+std::unordered_multimap<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/bucket.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/bucket.pass.cpp
index 80c97dd..0344087 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/bucket.pass.cpp
@@ -37,9 +37,9 @@
             P(2, "four"),
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 7);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #if TEST_STD_VER >= 11
@@ -57,9 +57,9 @@
             P(2, "four"),
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 7);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/empty.verify.cpp
index aead051..999d43f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <unordered_map>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::unordered_multimap<int, int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
index 2da3b17..90a6cae 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
@@ -31,7 +31,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/max_size.pass.cpp
index d03cf67..182f5a3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/max_size.pass.cpp
@@ -33,7 +33,7 @@
     LIBCPP_ASSERT(c.max_size() == 10);
   }
   {
-    typedef limited_allocator<KV, (size_t)-1> A;
+    typedef limited_allocator<KV, (std::size_t)-1> A;
     typedef std::unordered_multimap<int, int, std::hash<int>,
                                     std::equal_to<int>, A>
         C;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/rehash.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/rehash.pass.cpp
index 99538e3..33d2bc0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/rehash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/rehash.pass.cpp
@@ -26,7 +26,7 @@
 #include "min_allocator.h"
 
 template <class C>
-void rehash_postcondition(const C& c, size_t n)
+void rehash_postcondition(const C& c, std::size_t n)
 {
     assert(c.bucket_count() >= c.size() / c.max_load_factor() && c.bucket_count() >= n);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/reserve.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/reserve.pass.cpp
index 2d3d8f2..b658539 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/reserve.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/reserve.pass.cpp
@@ -46,16 +46,16 @@
     assert(c.find(4)->second == "four");
 }
 
-void reserve_invariant(size_t n) // LWG #2156
+void reserve_invariant(std::size_t n) // LWG #2156
 {
-    for (size_t i = 0; i < n; ++i)
+    for (std::size_t i = 0; i < n; ++i)
     {
-        std::unordered_multimap<size_t, size_t> c;
+        std::unordered_multimap<std::size_t, size_t> c;
         c.reserve(n);
-        size_t buckets = c.bucket_count();
-        for (size_t j = 0; j < i; ++j)
+        std::size_t buckets = c.bucket_count();
+        for (std::size_t j = 0; j < i; ++j)
         {
-            c.insert(std::unordered_multimap<size_t, size_t>::value_type(i,i));
+            c.insert(std::unordered_multimap<std::size_t, size_t>::value_type(i,i));
             assert(buckets == c.bucket_count());
         }
     }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
index b237e3a..24e9249 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
@@ -31,7 +31,7 @@
 };
 
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
-struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
+struct Hash { std::size_t operator() (const TemplateConstructor &) const { return 0; } };
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
index 1b9e741..8905dc2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     auto some_key = c.cbegin()->first;
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
index 293e0c0..3f2f69f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
index 5b8cd8e..461f7a3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
@@ -37,7 +37,7 @@
     {
         typename Container::node_type node = nf(i, i + 1);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
index 04b1126..e9c0c3f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
@@ -40,7 +40,7 @@
 
     throw_hasher(bool& should_throw) : should_throw_(should_throw) {}
 
-    size_t operator()(const T& p) const
+    std::size_t operator()(const T& p) const
     {
         if (should_throw_)
             throw 0;
@@ -95,7 +95,7 @@
     struct hasher
     {
         hasher() = default;
-        size_t operator()(const Counter<int>& p) const
+        std::size_t operator()(const Counter<int>& p) const
         {
             return std::hash<Counter<int>>()(p);
         }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.verify.cpp
similarity index 68%
copy from third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.verify.cpp
index 6183761..16590f0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <unordered_set>
 
-int main(int, char**)
-{
-    std::unordered_multiset<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
-
-  return 0;
-}
+std::unordered_multiset<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/bucket.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/bucket.pass.cpp
index 5436c1e..dd48710 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/bucket.pass.cpp
@@ -35,9 +35,9 @@
             P(2)
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 7);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #if TEST_STD_VER >= 11
@@ -55,9 +55,9 @@
             P(2)
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 7);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/empty.verify.cpp
index 547dd81..8f5fa55 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <unordered_set>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::unordered_multiset<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
index 2dee501..ffdcde8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
@@ -27,7 +27,7 @@
 };
 
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
-struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
+struct Hash { std::size_t operator() (const TemplateConstructor &) const { return 0; } };
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
index a7fe88d..7bdc4f8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
@@ -32,7 +32,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
index 153e56d..d88e33b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     for (auto first = c.cbegin(); first != c.cend();)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
index 3c4de6e..ec1ace8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
index ff1fc98..2706899 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
@@ -36,7 +36,7 @@
     {
         typename Container::node_type node = nf(i);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(prev + 1 == c.size());
         assert(*it == i);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/max_size.pass.cpp
index d08cdb6..47b165f 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/max_size.pass.cpp
@@ -32,7 +32,7 @@
       LIBCPP_ASSERT(c.max_size() == 10);
     }
     {
-      typedef limited_allocator<int, (size_t)-1> A;
+      typedef limited_allocator<int, (std::size_t)-1> A;
       typedef std::unordered_multiset<int, std::hash<int>, std::equal_to<int>,
                                       A>
           C;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/merge.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/merge.pass.cpp
index fc986ec..00435d8 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/merge.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/merge.pass.cpp
@@ -40,7 +40,7 @@
 
     throw_hasher(bool& should_throw) : should_throw_(should_throw) {}
 
-    size_t operator()(const T& p) const
+    std::size_t operator()(const T& p) const
     {
         if (should_throw_)
             throw 0;
@@ -95,7 +95,7 @@
     struct hasher
     {
         hasher() = default;
-        size_t operator()(const Counter<int>& p) const { return std::hash<Counter<int>>()(p); }
+        std::size_t operator()(const Counter<int>& p) const { return std::hash<Counter<int>>()(p); }
     };
     {
         typedef std::unordered_multiset<Counter<int>, std::hash<Counter<int>>, std::equal_to<Counter<int>>> first_set_type;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/rehash.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/rehash.pass.cpp
index 8c6699b..1ef3bdc 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/rehash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/rehash.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class C>
-void rehash_postcondition(const C& c, size_t n)
+void rehash_postcondition(const C& c, std::size_t n)
 {
     assert(c.bucket_count() >= c.size() / c.max_load_factor() && c.bucket_count() >= n);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/reserve.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/reserve.pass.cpp
index 54eada5..557a924 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/reserve.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/reserve.pass.cpp
@@ -30,14 +30,14 @@
     assert(c.count(4) == 1);
 }
 
-void reserve_invariant(size_t n) // LWG #2156
+void reserve_invariant(std::size_t n) // LWG #2156
 {
-    for (size_t i = 0; i < n; ++i)
+    for (std::size_t i = 0; i < n; ++i)
     {
-        std::unordered_multiset<size_t> c;
+        std::unordered_multiset<std::size_t> c;
         c.reserve(n);
-        size_t buckets = c.bucket_count();
-        for (size_t j = 0; j < i; ++j)
+        std::size_t buckets = c.bucket_count();
+        for (std::size_t j = 0; j < i; ++j)
         {
             c.insert(i);
             assert(buckets == c.bucket_count());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.compile.fail.cpp
deleted file mode 100644
index 0d1341e..0000000
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.compile.fail.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <unordered_set>
-//   The container's value type must be the same as the allocator's value type
-
-#include <unordered_set>
-
-int main(int, char**)
-{
-    std::unordered_set<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.verify.cpp
similarity index 69%
rename from third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.verify.cpp
index 6183761..94be4d7 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.multiset/allocator_mismatch.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/allocator_mismatch.verify.cpp
@@ -11,9 +11,5 @@
 
 #include <unordered_set>
 
-int main(int, char**)
-{
-    std::unordered_multiset<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
-
-  return 0;
-}
+std::unordered_set<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
+  // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed{{.*}}Allocator::value_type must be same type as value_type}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/bucket.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/bucket.pass.cpp
index bcaa77b..969c3f6 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/bucket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/bucket.pass.cpp
@@ -35,9 +35,9 @@
             P(2)
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 5);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #if TEST_STD_VER >= 11
@@ -54,9 +54,9 @@
             P(2)
         };
         const C c(std::begin(a), std::end(a));
-        size_t bc = c.bucket_count();
+        std::size_t bc = c.bucket_count();
         assert(bc >= 5);
-        for (size_t i = 0; i < 13; ++i)
+        for (std::size_t i = 0; i < 13; ++i)
             LIBCPP_ASSERT(c.bucket(i) == i % bc);
     }
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/empty.verify.cpp
index 4a739a3..e216441 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <unordered_set>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::unordered_set<int> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
index cc70913..4a66329 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
@@ -27,7 +27,7 @@
 };
 
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
-struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
+struct Hash { std::size_t operator() (const TemplateConstructor &) const { return 0; } };
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_if.pass.cpp
index a2c7325..ba5f3bf 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/erase_if.pass.cpp
@@ -32,7 +32,7 @@
 }
 
 template <typename M, typename Pred>
-void test0(Init vals, Pred p, Init expected, size_t expected_erased_count) {
+void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
   M s = make<M>(vals);
   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
index d4a0a7c..f638250 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
@@ -22,7 +22,7 @@
 template <class Container>
 void test(Container& c)
 {
-    size_t sz = c.size();
+    std::size_t sz = c.size();
 
     for (auto first = c.cbegin(); first != c.cend();)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_key.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_key.pass.cpp
index e0d4856..3bfb6c3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_key.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/extract_key.pass.cpp
@@ -22,8 +22,8 @@
 template <class Container, class KeyTypeIter>
 void test(Container& c, KeyTypeIter first, KeyTypeIter last)
 {
-    size_t sz = c.size();
-    assert((size_t)std::distance(first, last) == sz);
+    std::size_t sz = c.size();
+    assert((std::size_t)std::distance(first, last) == sz);
 
     for (KeyTypeIter copy = first; copy != last; ++copy)
     {
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
index 3bb7d4f..b4b3d88 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
@@ -37,7 +37,7 @@
     {
         typename Container::node_type node = nf(i);
         assert(!node.empty());
-        size_t prev = c.size();
+        std::size_t prev = c.size();
         auto it = c.insert(c.end(), std::move(node));
         assert(node.empty());
         assert(prev + 1 == c.size());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/max_size.pass.cpp
index aeb1354..289c4d3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/max_size.pass.cpp
@@ -30,7 +30,7 @@
       LIBCPP_ASSERT(c.max_size() == 10);
     }
     {
-      typedef limited_allocator<int, (size_t)-1> A;
+      typedef limited_allocator<int, (std::size_t)-1> A;
       typedef std::unordered_set<int, std::hash<int>, std::equal_to<int>, A> C;
       const C::size_type max_dist =
           static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/merge.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/merge.pass.cpp
index ef06ca8..c1b0e17 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/merge.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/merge.pass.cpp
@@ -40,7 +40,7 @@
 
     throw_hasher(bool& should_throw) : should_throw_(should_throw) {}
 
-    size_t operator()(const T& p) const
+    std::size_t operator()(const T& p) const
     {
         if (should_throw_)
             throw 0;
@@ -95,7 +95,7 @@
     struct hasher
     {
         hasher() = default;
-        size_t operator()(const Counter<int>& p) const { return std::hash<Counter<int>>()(p); }
+        std::size_t operator()(const Counter<int>& p) const { return std::hash<Counter<int>>()(p); }
     };
     {
         typedef std::unordered_set<Counter<int>, std::hash<Counter<int>>, std::equal_to<Counter<int>>> first_set_type;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/rehash.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/rehash.pass.cpp
index e45327a..a0482fc 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/rehash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/rehash.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class C>
-void rehash_postcondition(const C& c, size_t n)
+void rehash_postcondition(const C& c, std::size_t n)
 {
     assert(c.bucket_count() >= c.size() / c.max_load_factor() && c.bucket_count() >= n);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/reserve.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/reserve.pass.cpp
index 7ea358e..afcccf9 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/reserve.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/unord/unord.set/reserve.pass.cpp
@@ -30,14 +30,14 @@
     assert(c.count(4) == 1);
 }
 
-void reserve_invariant(size_t n) // LWG #2156
+void reserve_invariant(std::size_t n) // LWG #2156
 {
-    for (size_t i = 0; i < n; ++i)
+    for (std::size_t i = 0; i < n; ++i)
     {
-        std::unordered_set<size_t> c;
+        std::unordered_set<std::size_t> c;
         c.reserve(n);
-        size_t buckets = c.bucket_count();
-        for (size_t j = 0; j < i; ++j)
+        std::size_t buckets = c.bucket_count();
+        for (std::size_t j = 0; j < i; ++j)
         {
             c.insert(i);
             assert(buckets == c.bucket_count());
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/assign.pass.cpp
index 7481987..3f35811 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/assign.pass.cpp
@@ -241,8 +241,8 @@
             {arr + 1, arr + 3} // same size as s2
             };
 
-        for (size_t i = 0; i < std::size(spans); ++i)
-            for (size_t j = i; j < std::size(spans); ++j)
+        for (std::size_t i = 0; i < std::size(spans); ++i)
+            for (std::size_t j = i; j < std::size(spans); ++j)
                 assert((doAssign(spans[i], spans[j])));
     }
 
@@ -255,8 +255,8 @@
             spanType{arr + 2, arr + 4}
             };
 
-        for (size_t i = 0; i < std::size(spans); ++i)
-            for (size_t j = i; j < std::size(spans); ++j)
+        for (std::size_t i = 0; i < std::size(spans); ++i)
+            for (std::size_t j = i; j < std::size(spans); ++j)
                 assert((doAssign(spans[i], spans[j])));
     }
 
@@ -275,8 +275,8 @@
             {strs + 3, strs + 3}
             };
 
-        for (size_t i = 0; i < std::size(spans); ++i)
-            for (size_t j = i; j < std::size(spans); ++j)
+        for (std::size_t i = 0; i < std::size(spans); ++i)
+            for (std::size_t j = i; j < std::size(spans); ++j)
                 assert((doAssign(spans[i], spans[j])));
     }
 
@@ -288,8 +288,8 @@
             spanType{strs + 2, strs + 3}
             };
 
-        for (size_t i = 0; i < std::size(spans); ++i)
-            for (size_t j = i; j < std::size(spans); ++j)
+        for (std::size_t i = 0; i < std::size(spans); ++i)
+            for (std::size_t j = i; j < std::size(spans); ++j)
                 assert((doAssign(spans[i], spans[j])));
     }
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.pass.cpp
index f197330..fbbd3d6 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.pass.cpp
@@ -20,23 +20,23 @@
 #include <iterator>
 #include <type_traits>
 
-template <size_t Extent>
+template <std::size_t Extent>
 constexpr void test_constructibility() {
   struct Other {};
-  static_assert(std::is_constructible_v<std::span<int, Extent>, int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<int, Extent>, const int*, size_t>);
-  static_assert(std::is_constructible_v<std::span<const int, Extent>, int*, size_t>);
-  static_assert(std::is_constructible_v<std::span<const int, Extent>, const int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<int, Extent>, volatile int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<int, Extent>, const volatile int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<const int, Extent>, volatile int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<const int, Extent>, const volatile int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const int*, size_t>);
-  static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const volatile int*, size_t>);
+  static_assert(std::is_constructible_v<std::span<int, Extent>, int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<int, Extent>, const int*, std::size_t>);
+  static_assert(std::is_constructible_v<std::span<const int, Extent>, int*, std::size_t>);
+  static_assert(std::is_constructible_v<std::span<const int, Extent>, const int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<int, Extent>, volatile int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<int, Extent>, const volatile int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<const int, Extent>, volatile int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<const int, Extent>, const volatile int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const int*, std::size_t>);
+  static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const volatile int*, std::size_t>);
   static_assert(
-      !std::is_constructible_v<std::span<int, Extent>, double*, size_t>); // iterator type differs from span type
-  static_assert(!std::is_constructible_v<std::span<int, Extent>, size_t, size_t>);
-  static_assert(!std::is_constructible_v<std::span<int, Extent>, Other*, size_t>); // unrelated iterator type
+      !std::is_constructible_v<std::span<int, Extent>, double*, std::size_t>); // iterator type differs from span type
+  static_assert(!std::is_constructible_v<std::span<int, Extent>, std::size_t, size_t>);
+  static_assert(!std::is_constructible_v<std::span<int, Extent>, Other*, std::size_t>); // unrelated iterator type
 }
 
 template <class T>
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.verify.cpp
index 0372e00..3836c97 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_len.verify.cpp
@@ -17,12 +17,12 @@
 #include <span>
 #include <cstddef>
 
-template <class T, size_t extent>
-std::span<T, extent> createImplicitSpan(T* ptr, size_t len) {
+template <class T, std::size_t extent>
+std::span<T, extent> createImplicitSpan(T* ptr, std::size_t len) {
   return {ptr, len}; // expected-error {{chosen constructor is explicit in copy-initialization}}
 }
 
-int main(int, char**) {
+void f() {
   // explicit constructor necessary
   int arr[] = {1, 2, 3};
   createImplicitSpan<int, 1>(arr, 3);
@@ -31,6 +31,4 @@
   std::span<int, 2> sp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 2>'}}
   std::span<const int> csp = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
   std::span<const int, 2> csp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 2>'}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.pass.cpp
index f744af7..c2d650b 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.pass.cpp
@@ -13,24 +13,28 @@
 // constexpr explicit(Extent != dynamic_extent) span(It first, End last);
 // Requires: [first, last) shall be a valid range.
 //   If Extent is not equal to dynamic_extent, then last - first shall be equal to Extent.
-//
+// Throws: When and what last - first throws.
 
+#include <array>
 #include <span>
 #include <cassert>
+#include <utility>
 
+#include "assert_macros.h"
 #include "test_iterators.h"
+#include "test_macros.h"
 
 template <class T, class Sentinel>
 constexpr bool test_ctor() {
   T val[2] = {};
-  auto s1 = std::span<T>(std::begin(val), Sentinel(std::end(val)));
-  auto s2 = std::span<T, 2>(std::begin(val), Sentinel(std::end(val)));
+  auto s1  = std::span<T>(std::begin(val), Sentinel(std::end(val)));
+  auto s2  = std::span<T, 2>(std::begin(val), Sentinel(std::end(val)));
   assert(s1.data() == std::data(val) && s1.size() == std::size(val));
   assert(s2.data() == std::data(val) && s2.size() == std::size(val));
   return true;
 }
 
-template <size_t Extent>
+template <std::size_t Extent>
 constexpr void test_constructibility() {
   static_assert(std::is_constructible_v<std::span<int, Extent>, int*, int*>);
   static_assert(!std::is_constructible_v<std::span<int, Extent>, const int*, const int*>);
@@ -55,8 +59,85 @@
   return true;
 }
 
+#ifndef TEST_HAS_NO_EXCEPTIONS
+// A stripped down contiguous iterator that throws when using operator-.
+template <class It>
+class throw_operator_minus {
+  It it_;
+
+public:
+  typedef std::contiguous_iterator_tag iterator_category;
+  typedef typename std::iterator_traits<It>::value_type value_type;
+  typedef typename std::iterator_traits<It>::difference_type difference_type;
+  typedef It pointer;
+  typedef typename std::iterator_traits<It>::reference reference;
+  typedef typename std::remove_pointer<It>::type element_type;
+
+  throw_operator_minus() : it_() {}
+  explicit throw_operator_minus(It it) : it_(it) {}
+
+  reference operator*() const { return *it_; }
+  pointer operator->() const { return it_; }
+  reference operator[](difference_type n) const { return it_[n]; }
+
+  throw_operator_minus& operator++() {
+    ++it_;
+    return *this;
+  }
+  throw_operator_minus& operator--() {
+    --it_;
+    return *this;
+  }
+  throw_operator_minus operator++(int) { return throw_operator_minus(it_++); }
+  throw_operator_minus operator--(int) { return throw_operator_minus(it_--); }
+
+  throw_operator_minus& operator+=(difference_type n) {
+    it_ += n;
+    return *this;
+  }
+  throw_operator_minus& operator-=(difference_type n) {
+    it_ -= n;
+    return *this;
+  }
+  friend throw_operator_minus operator+(throw_operator_minus x, difference_type n) {
+    x += n;
+    return x;
+  }
+  friend throw_operator_minus operator+(difference_type n, throw_operator_minus x) {
+    x += n;
+    return x;
+  }
+  friend throw_operator_minus operator-(throw_operator_minus x, difference_type n) {
+    x -= n;
+    return x;
+  }
+  friend difference_type operator-(throw_operator_minus, throw_operator_minus) { throw 42; };
+
+  friend bool operator==(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ == y.it_; }
+  friend bool operator<=>(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ <=> y.it_; }
+};
+
+template <class It>
+throw_operator_minus(It) -> throw_operator_minus<It>;
+
+void test_exceptions() {
+  std::array a{42};
+  TEST_VALIDATE_EXCEPTION(
+      int,
+      [](int i) { assert(i == 42); },
+      (std::span<int>{throw_operator_minus{a.begin()}, throw_operator_minus{a.end()}}));
+  TEST_VALIDATE_EXCEPTION(
+      int,
+      [](int i) { assert(i == 42); },
+      (std::span<int, 1>{throw_operator_minus{a.begin()}, throw_operator_minus{a.end()}}));
+}
+#endif // TEST_HAS_NO_EXCEPTIONS
+
 int main(int, char**) {
   test();
+#ifndef TEST_HAS_NO_EXCEPTIONS
+  test_exceptions();
+#endif
   static_assert(test());
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.verify.cpp
index 9ac9a03..a31aa2a 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/iterator_sentinel.verify.cpp
@@ -18,16 +18,13 @@
 #include <span>
 #include <iterator>
 
-
-template<class T, size_t Extent>
+template<class T, std::size_t Extent>
 std::span<T, Extent> createImplicitSpan(T* first, T* last) {
     return {first, last}; // expected-error {{chosen constructor is explicit in copy-initialization}}
 }
 
-int main(int, char**) {
+void f() {
   // explicit constructor necessary
   int arr[] = {1, 2, 3};
   createImplicitSpan<int, 1>(std::begin(arr), std::end(arr));
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/range.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/range.pass.cpp
index d484754..71fee43 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/range.pass.cpp
@@ -22,7 +22,7 @@
 
 #include "test_iterators.h"
 
-template <class T, size_t Extent>
+template <class T, std::size_t Extent>
 constexpr void test_from_range() {
   T val[3]{};
   std::span<T, Extent> s{val};
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/span.fail.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/span.fail.cpp
index c3c3631..784530e 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/span.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.cons/span.fail.cpp
@@ -23,7 +23,7 @@
 
 #include "test_macros.h"
 
-template<class T, size_t extent, size_t otherExtent>
+template<class T, std::size_t extent, size_t otherExtent>
 std::span<T, extent> createImplicitSpan(std::span<T, otherExtent> s) {
     return {s}; // expected-error {{chosen constructor is explicit in copy-initialization}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
index fdafbfc..e46fd26 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
@@ -21,7 +21,7 @@
 
 
 template <typename Span>
-constexpr bool testConstexprSpan(Span sp, size_t idx)
+constexpr bool testConstexprSpan(Span sp, std::size_t idx)
 {
     LIBCPP_ASSERT(noexcept(sp[idx]));
 
@@ -32,7 +32,7 @@
 
 
 template <typename Span>
-void testRuntimeSpan(Span sp, size_t idx)
+void testRuntimeSpan(Span sp, std::size_t idx)
 {
     LIBCPP_ASSERT(noexcept(sp[idx]));
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
index d531537..d6aaf74 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
@@ -34,7 +34,7 @@
         ret = ret &&  (&*( e-1) == last);
     }
 
-    ret = ret &&  (static_cast<size_t>(e - s.begin()) == s.size());
+    ret = ret &&  (static_cast<std::size_t>(e - s.begin()) == s.size());
     return ret;
 }
 
@@ -53,7 +53,7 @@
         assert(&*( e-1) == last);
     }
 
-    assert(static_cast<size_t>(e - s.begin()) == s.size());
+    assert(static_cast<std::size_t>(e - s.begin()) == s.size());
 }
 
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
index c2bd13a..ffec15c 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
@@ -32,7 +32,7 @@
         ret = ret &&  (e != s.rbegin());
     }
 
-    ret = ret &&  (static_cast<size_t>(e - s.rbegin()) == s.size());
+    ret = ret &&  (static_cast<std::size_t>(e - s.rbegin()) == s.size());
     return ret;
 }
 
@@ -49,7 +49,7 @@
         assert(e != s.rbegin());
     }
 
-    assert(static_cast<size_t>(e - s.rbegin()) == s.size());
+    assert(static_cast<std::size_t>(e - s.rbegin()) == s.size());
 }
 
 
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.objectrep/as_writable_bytes.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.objectrep/as_writable_bytes.verify.cpp
index d32d591..45485b3 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.objectrep/as_writable_bytes.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.objectrep/as_writable_bytes.verify.cpp
@@ -36,7 +36,7 @@
   std::as_writable_bytes(std::span<const long, 0>());        // expected-error {{no matching function for call to 'as_writable_bytes'}}
   std::as_writable_bytes(std::span<const double, 0>());      // expected-error {{no matching function for call to 'as_writable_bytes'}}
   std::as_writable_bytes(std::span<const A, 0>());           // expected-error {{no matching function for call to 'as_writable_bytes'}}
-  std::as_writable_bytes(std::span<const std::string, (size_t)0>()); // expected-error {{no matching function for call to 'as_writable_bytes'}}
+  std::as_writable_bytes(std::span<const std::string, (std::size_t)0>()); // expected-error {{no matching function for call to 'as_writable_bytes'}}
 
   std::as_writable_bytes(std::span<const int>   (iArr2, 1));     // expected-error {{no matching function for call to 'as_writable_bytes'}}
   std::as_writable_bytes(std::span<const int, 1>(iArr2 + 5, 1)); // expected-error {{no matching function for call to 'as_writable_bytes'}}
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size.pass.cpp
index 5be7b98..fa41d78 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size.pass.cpp
@@ -21,7 +21,7 @@
 
 
 template <typename Span>
-constexpr bool testConstexprSpan(Span sp, size_t sz)
+constexpr bool testConstexprSpan(Span sp, std::size_t sz)
 {
     ASSERT_NOEXCEPT(sp.size());
     return sp.size() == sz;
@@ -29,7 +29,7 @@
 
 
 template <typename Span>
-void testRuntimeSpan(Span sp, size_t sz)
+void testRuntimeSpan(Span sp, std::size_t sz)
 {
     ASSERT_NOEXCEPT(sp.size());
     assert(sp.size() == sz);
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size_bytes.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size_bytes.pass.cpp
index 9ce6d26..c25eaaa2 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size_bytes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.obs/size_bytes.pass.cpp
@@ -22,18 +22,18 @@
 
 
 template <typename Span>
-constexpr bool testConstexprSpan(Span sp, size_t sz)
+constexpr bool testConstexprSpan(Span sp, std::size_t sz)
 {
     ASSERT_NOEXCEPT(sp.size_bytes());
-    return (size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type);
+    return (std::size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type);
 }
 
 
 template <typename Span>
-void testRuntimeSpan(Span sp, size_t sz)
+void testRuntimeSpan(Span sp, std::size_t sz)
 {
     ASSERT_NOEXCEPT(sp.size_bytes());
-    assert((size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type));
+    assert((std::size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type));
 }
 
 struct A{};
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.pass.cpp
index 2b04cb0..a354ade 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.pass.cpp
@@ -14,8 +14,7 @@
 //
 // constexpr span<element_type, dynamic_extent> first(size_type count) const;
 //
-//  Requires: Count <= size().
-
+// Mandates: Count <= Extent is true.
 
 #include <span>
 #include <cassert>
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-template <typename Span, size_t Count>
+template <typename Span, std::size_t Count>
 constexpr bool testConstexprSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template first<Count>())));
@@ -44,7 +43,7 @@
 }
 
 
-template <typename Span, size_t Count>
+template <typename Span, std::size_t Count>
 void testRuntimeSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template first<Count>())));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.verify.cpp
index 8e011b5..39d04b0 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/first.verify.cpp
@@ -12,7 +12,7 @@
 // template<size_t Count>
 //  constexpr span<element_type, Count> first() const;
 //
-//  Requires: Count <= size().
+// Mandates: Count <= Extent is true.
 
 #include <span>
 #include <cstddef>
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.pass.cpp
index 6fa6edf..017c805 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.pass.cpp
@@ -14,8 +14,7 @@
 //
 // constexpr span<element_type, dynamic_extent> last(size_type count) const;
 //
-//  Requires: Count <= size().
-
+// Mandates: Count <= Extent is true.
 
 #include <span>
 #include <cassert>
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-template <typename Span, size_t Count>
+template <typename Span, std::size_t Count>
 constexpr bool testConstexprSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template last<Count>())));
@@ -44,7 +43,7 @@
 }
 
 
-template <typename Span, size_t Count>
+template <typename Span, std::size_t Count>
 void testRuntimeSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template last<Count>())));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.verify.cpp
index 1594e68..9fc6deb 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/last.verify.cpp
@@ -12,7 +12,7 @@
 // template<size_t Count>
 //  constexpr span<element_type, Count> last() const;
 //
-//  Requires: Count <= size().
+// Mandates: Count <= Extent is true.
 
 #include <span>
 #include <cstddef>
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.pass.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.pass.cpp
index f426ab6..4013630 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.pass.cpp
@@ -15,8 +15,7 @@
 // constexpr span<element_type, dynamic_extent> subspan(
 //   size_type offset, size_type count = dynamic_extent) const;
 //
-//  Requires: (0 <= Offset && Offset <= size())
-//      && (Count == dynamic_extent || Count >= 0 && Offset + Count <= size())
+// Mandates: Offset <= Extent && (Count == dynamic_extent || Count <= Extent - Offset) is true.
 
 #include <span>
 #include <cassert>
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-template <typename Span, size_t Offset, size_t Count>
+template <typename Span, std::size_t Offset, size_t Count>
 constexpr bool testConstexprSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template subspan<Offset, Count>())));
@@ -44,7 +43,7 @@
      && std::equal(s1.begin(), s1.end(), sp.begin() + Offset);
 }
 
-template <typename Span, size_t Offset>
+template <typename Span, std::size_t Offset>
 constexpr bool testConstexprSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template subspan<Offset>())));
@@ -64,7 +63,7 @@
 }
 
 
-template <typename Span, size_t Offset, size_t Count>
+template <typename Span, std::size_t Offset, size_t Count>
 void testRuntimeSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template subspan<Offset, Count>())));
@@ -83,7 +82,7 @@
 }
 
 
-template <typename Span, size_t Offset>
+template <typename Span, std::size_t Offset>
 void testRuntimeSpan(Span sp)
 {
     LIBCPP_ASSERT((noexcept(sp.template subspan<Offset>())));
diff --git a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp
index 1e58162..d6bc211 100644
--- a/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp
@@ -14,10 +14,9 @@
 // <span>
 
 // template<size_t Offset, size_t Count = dynamic_extent>
-//   constexpr span<element_type, see below> subspan() const;
+//   constexpr span<element_type, see-below> subspan() const;
 //
-//  Requires: offset <= size() &&
-//            (count == dynamic_extent || count <= size() - offset)
+// Mandates: Offset <= Extent && (Count == dynamic_extent || Count <= Extent - Offset) is true.
 
 #include <span>
 #include <cstddef>
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/assert_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/assert_h.pass.cpp
index 364e931..8d1b883 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/assert_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/assert_h.pass.cpp
@@ -10,14 +10,12 @@
 
 #include <assert.h>
 
-#include "test_macros.h"
-
 #ifndef assert
 #error assert not defined
 #endif
 
-int main(int, char**)
-{
+int main(int, char**) {
+  assert(true);
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.compile.pass.cpp
similarity index 85%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.compile.pass.cpp
index b619499..4dff57f 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ciso646.compile.pass.cpp
@@ -9,11 +9,3 @@
 // <ciso646>
 
 #include <ciso646>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex_h.compile.pass.cpp
similarity index 79%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex_h.compile.pass.cpp
index 92dc58c..00118a6 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex_h.compile.pass.cpp
@@ -10,12 +10,4 @@
 
 #include <complex.h>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
-
-  return 0;
-}
+std::complex<double> d;
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ctype_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ctype_h.pass.cpp
index b5deeee..29ea1f8 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ctype_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/ctype_h.pass.cpp
@@ -9,8 +9,6 @@
 // <ctype.h>
 
 #include <ctype.h>
-#include <type_traits>
-#include <cassert>
 
 #include "test_macros.h"
 
@@ -70,37 +68,38 @@
 #error toupper defined
 #endif
 
-int main(int, char**)
-{
-    static_assert((std::is_same<decltype(isalnum(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isalpha(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isblank(0)), int>::value), "");
-    static_assert((std::is_same<decltype(iscntrl(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isdigit(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isgraph(0)), int>::value), "");
-    static_assert((std::is_same<decltype(islower(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isprint(0)), int>::value), "");
-    static_assert((std::is_same<decltype(ispunct(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isspace(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isupper(0)), int>::value), "");
-    static_assert((std::is_same<decltype(isxdigit(0)), int>::value), "");
-    static_assert((std::is_same<decltype(tolower(0)), int>::value), "");
-    static_assert((std::is_same<decltype(toupper(0)), int>::value), "");
+ASSERT_SAME_TYPE(int, decltype(isalnum(0)));
+ASSERT_SAME_TYPE(int, decltype(isalpha(0)));
+ASSERT_SAME_TYPE(int, decltype(isblank(0)));
+ASSERT_SAME_TYPE(int, decltype(iscntrl(0)));
+ASSERT_SAME_TYPE(int, decltype(isdigit(0)));
+ASSERT_SAME_TYPE(int, decltype(isgraph(0)));
+ASSERT_SAME_TYPE(int, decltype(islower(0)));
+ASSERT_SAME_TYPE(int, decltype(isprint(0)));
+ASSERT_SAME_TYPE(int, decltype(ispunct(0)));
+ASSERT_SAME_TYPE(int, decltype(isspace(0)));
+ASSERT_SAME_TYPE(int, decltype(isupper(0)));
+ASSERT_SAME_TYPE(int, decltype(isxdigit(0)));
+ASSERT_SAME_TYPE(int, decltype(tolower(0)));
+ASSERT_SAME_TYPE(int, decltype(toupper(0)));
 
-    assert(isalnum('a'));
-    assert(isalpha('a'));
-    assert(isblank(' '));
-    assert(!iscntrl(' '));
-    assert(!isdigit('a'));
-    assert(isgraph('a'));
-    assert(islower('a'));
-    assert(isprint('a'));
-    assert(!ispunct('a'));
-    assert(!isspace('a'));
-    assert(!isupper('a'));
-    assert(isxdigit('a'));
-    assert(tolower('A') == 'a');
-    assert(toupper('a') == 'A');
+#include <cassert>
+
+int main(int, char**) {
+  assert(isalnum('a'));
+  assert(isalpha('a'));
+  assert(isblank(' '));
+  assert(!iscntrl(' '));
+  assert(!isdigit('a'));
+  assert(isgraph('a'));
+  assert(islower('a'));
+  assert(isprint('a'));
+  assert(!ispunct('a'));
+  assert(!isspace('a'));
+  assert(!isupper('a'));
+  assert(isxdigit('a'));
+  assert(tolower('A') == 'a');
+  assert(toupper('a') == 'A');
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.compile.pass.cpp
similarity index 89%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.compile.pass.cpp
index faa2c82..c2cc69e 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/errno_h.compile.pass.cpp
@@ -10,8 +10,6 @@
 
 #include <errno.h>
 
-#include "test_macros.h"
-
 #ifndef EDOM
 #error EDOM not defined
 #endif
@@ -27,9 +25,3 @@
 #ifndef errno
 #error errno not defined
 #endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.compile.pass.cpp
new file mode 100644
index 0000000..d1f56b8
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.compile.pass.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <fenv.h>
+
+#include <fenv.h>
+
+#include "test_macros.h"
+
+#ifndef FE_DIVBYZERO
+#error FE_DIVBYZERO not defined
+#endif
+
+#ifndef FE_INEXACT
+#error FE_INEXACT not defined
+#endif
+
+#ifndef FE_INVALID
+#error FE_INVALID not defined
+#endif
+
+#ifndef FE_OVERFLOW
+#error FE_OVERFLOW not defined
+#endif
+
+#ifndef FE_UNDERFLOW
+#error FE_UNDERFLOW not defined
+#endif
+
+#ifndef FE_ALL_EXCEPT
+#error FE_ALL_EXCEPT not defined
+#endif
+
+#ifndef FE_DOWNWARD
+#error FE_DOWNWARD not defined
+#endif
+
+#ifndef FE_TONEAREST
+#error FE_TONEAREST not defined
+#endif
+
+#ifndef FE_TOWARDZERO
+#error FE_TOWARDZERO not defined
+#endif
+
+#ifndef FE_UPWARD
+#error FE_UPWARD not defined
+#endif
+
+#ifndef FE_DFL_ENV
+#error FE_DFL_ENV not defined
+#endif
+
+fenv_t fenv = {};
+fexcept_t fex = 0;
+ASSERT_SAME_TYPE(int, decltype(::feclearexcept(0)));
+ASSERT_SAME_TYPE(int, decltype(::fegetexceptflag(&fex, 0)));
+ASSERT_SAME_TYPE(int, decltype(::feraiseexcept(0)));
+ASSERT_SAME_TYPE(int, decltype(::fesetexceptflag(&fex, 0)));
+ASSERT_SAME_TYPE(int, decltype(::fetestexcept(0)));
+ASSERT_SAME_TYPE(int, decltype(::fegetround()));
+ASSERT_SAME_TYPE(int, decltype(::fesetround(0)));
+ASSERT_SAME_TYPE(int, decltype(::fegetenv(&fenv)));
+ASSERT_SAME_TYPE(int, decltype(::feholdexcept(&fenv)));
+ASSERT_SAME_TYPE(int, decltype(::fesetenv(&fenv)));
+ASSERT_SAME_TYPE(int, decltype(::feupdateenv(&fenv)));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.pass.cpp
deleted file mode 100644
index 2898539..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/fenv_h.pass.cpp
+++ /dev/null
@@ -1,77 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <fenv.h>
-
-#include <fenv.h>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef FE_DIVBYZERO
-#error FE_DIVBYZERO not defined
-#endif
-
-#ifndef FE_INEXACT
-#error FE_INEXACT not defined
-#endif
-
-#ifndef FE_INVALID
-#error FE_INVALID not defined
-#endif
-
-#ifndef FE_OVERFLOW
-#error FE_OVERFLOW not defined
-#endif
-
-#ifndef FE_UNDERFLOW
-#error FE_UNDERFLOW not defined
-#endif
-
-#ifndef FE_ALL_EXCEPT
-#error FE_ALL_EXCEPT not defined
-#endif
-
-#ifndef FE_DOWNWARD
-#error FE_DOWNWARD not defined
-#endif
-
-#ifndef FE_TONEAREST
-#error FE_TONEAREST not defined
-#endif
-
-#ifndef FE_TOWARDZERO
-#error FE_TOWARDZERO not defined
-#endif
-
-#ifndef FE_UPWARD
-#error FE_UPWARD not defined
-#endif
-
-#ifndef FE_DFL_ENV
-#error FE_DFL_ENV not defined
-#endif
-
-int main(int, char**)
-{
-    fenv_t fenv = {};
-    fexcept_t fex = 0;
-    static_assert((std::is_same<decltype(::feclearexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(::fegetexceptflag(&fex, 0)), int>::value), "");
-    static_assert((std::is_same<decltype(::feraiseexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(::fesetexceptflag(&fex, 0)), int>::value), "");
-    static_assert((std::is_same<decltype(::fetestexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(::fegetround()), int>::value), "");
-    static_assert((std::is_same<decltype(::fesetround(0)), int>::value), "");
-    static_assert((std::is_same<decltype(::fegetenv(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(::feholdexcept(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(::fesetenv(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(::feupdateenv(&fenv)), int>::value), "");
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.compile.pass.cpp
similarity index 98%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.compile.pass.cpp
index b3f4230..8a02934 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/float_h.compile.pass.cpp
@@ -177,9 +177,3 @@
 #error LDBL_TRUE_MIN not defined
 #endif
 #endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.compile.pass.cpp
similarity index 88%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.compile.pass.cpp
index b9f9a58..eaae3aa 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/inttypes_h.compile.pass.cpp
@@ -9,7 +9,6 @@
 // test <inttypes.h>
 
 #include <inttypes.h>
-#include <type_traits>
 
 #include "test_macros.h"
 
@@ -873,64 +872,51 @@
 #error SCNxPTR not defined
 #endif
 
-template <class T> void test()
-{
-    T t = 0;
-    ((void)t); // Prevent unused warning
-}
+void f() {
+    { int8_t x = 0; (void)x; }
+    { int16_t x = 0; (void)x; }
+    { int32_t x = 0; (void)x; }
+    { int64_t x = 0; (void)x; }
 
-int main(int, char**)
-{
-    test<int8_t >();
-    test<int16_t>();
-    test<int32_t>();
-    test<int64_t>();
+    { uint8_t x = 0; (void)x; }
+    { uint16_t x = 0; (void)x; }
+    { uint32_t x = 0; (void)x; }
+    { uint64_t x = 0; (void)x; }
 
-    test<uint8_t >();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
+    { int_least8_t x = 0; (void)x; }
+    { int_least16_t x = 0; (void)x; }
+    { int_least32_t x = 0; (void)x; }
+    { int_least64_t x = 0; (void)x; }
 
-    test<int_least8_t >();
-    test<int_least16_t>();
-    test<int_least32_t>();
-    test<int_least64_t>();
+    { uint_least8_t x = 0; (void)x; }
+    { uint_least16_t x = 0; (void)x; }
+    { uint_least32_t x = 0; (void)x; }
+    { uint_least64_t x = 0; (void)x; }
 
-    test<uint_least8_t >();
-    test<uint_least16_t>();
-    test<uint_least32_t>();
-    test<uint_least64_t>();
+    { int_fast8_t x = 0; (void)x; }
+    { int_fast16_t x = 0; (void)x; }
+    { int_fast32_t x = 0; (void)x; }
+    { int_fast64_t x = 0; (void)x; }
 
-    test<int_fast8_t >();
-    test<int_fast16_t>();
-    test<int_fast32_t>();
-    test<int_fast64_t>();
+    { uint_fast8_t x = 0; (void)x; }
+    { uint_fast16_t x = 0; (void)x; }
+    { uint_fast32_t x = 0; (void)x; }
+    { uint_fast64_t x = 0; (void)x; }
 
-    test<uint_fast8_t >();
-    test<uint_fast16_t>();
-    test<uint_fast32_t>();
-    test<uint_fast64_t>();
+    { intptr_t x = 0; (void)x; }
+    { uintptr_t x = 0; (void)x; }
+    { intmax_t x = 0; (void)x; }
+    { uintmax_t x = 0; (void)x; }
 
-    test<intptr_t >();
-    test<uintptr_t>();
-    test<intmax_t >();
-    test<uintmax_t>();
+    { imaxdiv_t x = {}; (void)x; }
 
-    {
-    imaxdiv_t  i1 = {};
-    ((void)i1); // Prevent unused warning
-    }
-
-    intmax_t i = 0;
-    ((void)i); // Prevent unused warning
-    static_assert((std::is_same<decltype(imaxabs(i)), intmax_t>::value), "");
-    static_assert((std::is_same<decltype(imaxdiv(i, i)), imaxdiv_t>::value), "");
-    static_assert((std::is_same<decltype(strtoimax("", (char**)0, 0)), intmax_t>::value), "");
-    static_assert((std::is_same<decltype(strtoumax("", (char**)0, 0)), uintmax_t>::value), "");
+    intmax_t i = 0; (void)i;
+    ASSERT_SAME_TYPE(intmax_t,  decltype(imaxabs(i)));
+    ASSERT_SAME_TYPE(imaxdiv_t, decltype(imaxdiv(i, i)));
+    ASSERT_SAME_TYPE(intmax_t,  decltype(strtoimax("", (char**)0, 0)));
+    ASSERT_SAME_TYPE(uintmax_t, decltype(strtoumax("", (char**)0, 0)));
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
-    static_assert((std::is_same<decltype(wcstoimax(L"", (wchar_t**)0, 0)), intmax_t>::value), "");
-    static_assert((std::is_same<decltype(wcstoumax(L"", (wchar_t**)0, 0)), uintmax_t>::value), "");
+    ASSERT_SAME_TYPE(intmax_t,  decltype(wcstoimax(L"", (wchar_t**)0, 0)));
+    ASSERT_SAME_TYPE(uintmax_t, decltype(wcstoumax(L"", (wchar_t**)0, 0)));
 #endif
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.compile.pass.cpp
similarity index 81%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.compile.pass.cpp
index 61510fe..4531ce3 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/iso646_h.compile.pass.cpp
@@ -9,12 +9,3 @@
 // <iso646.h>
 
 #include <iso646.h>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    // Nothing to test
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.compile.pass.cpp
similarity index 95%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.compile.pass.cpp
index bd0c7b9..4738cc4 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/limits_h.compile.pass.cpp
@@ -10,8 +10,6 @@
 
 #include <limits.h>
 
-#include "test_macros.h"
-
 #ifndef CHAR_BIT
 #error CHAR_BIT not defined
 #endif
@@ -87,9 +85,3 @@
 #ifndef ULLONG_MAX
 #error ULLONG_MAX not defined
 #endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.compile.pass.cpp
similarity index 76%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.compile.pass.cpp
index 9848f07..d0e6420 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/locale_h.compile.pass.cpp
@@ -11,7 +11,6 @@
 // <locale.h>
 
 #include <locale.h>
-#include <type_traits>
 
 #include "test_macros.h"
 
@@ -43,11 +42,6 @@
 #error NULL not defined
 #endif
 
-int main(int, char**)
-{
-    lconv lc; ((void)lc);
-    static_assert((std::is_same<decltype(setlocale(0, "")), char*>::value), "");
-    static_assert((std::is_same<decltype(localeconv()), lconv*>::value), "");
-
-    return 0;
-}
+lconv lc;
+ASSERT_SAME_TYPE(char*,  decltype(setlocale(0, "")));
+ASSERT_SAME_TYPE(lconv*, decltype(localeconv()));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/math_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/math_h.pass.cpp
index db815f9..87767a2 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/math_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/math_h.pass.cpp
@@ -107,26 +107,19 @@
 template <class T>
 struct has_abs : decltype(has_abs_imp<T>(0)) {};
 
-void test_abs()
-{
+void test_abs() {
   TEST_DIAGNOSTIC_PUSH
   TEST_CLANG_DIAGNOSTIC_IGNORED("-Wabsolute-value")
 
-  static_assert((std::is_same<decltype(abs((float)0)), float>::value), "");
-  static_assert((std::is_same<decltype(abs((double)0)), double>::value), "");
-  static_assert(
-      (std::is_same<decltype(abs((long double)0)), long double>::value), "");
-  static_assert((std::is_same<decltype(abs((int)0)), int>::value), "");
-  static_assert((std::is_same<decltype(abs((long)0)), long>::value), "");
-  static_assert((std::is_same<decltype(abs((long long)0)), long long>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((unsigned char)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((unsigned short)0)), int>::value),
-                "");
-
-  static_assert((std::is_same<decltype(abs(Ambiguous())), Ambiguous>::value),
-                "");
+  ASSERT_SAME_TYPE(decltype(abs((float)0)), float);
+  ASSERT_SAME_TYPE(decltype(abs((double)0)), double);
+  ASSERT_SAME_TYPE(decltype(abs((long double)0)), long double);
+  ASSERT_SAME_TYPE(decltype(abs((int)0)), int);
+  ASSERT_SAME_TYPE(decltype(abs((long)0)), long);
+  ASSERT_SAME_TYPE(decltype(abs((long long)0)), long long);
+  ASSERT_SAME_TYPE(decltype(abs((unsigned char)0)), int);
+  ASSERT_SAME_TYPE(decltype(abs((unsigned short)0)), int);
+  ASSERT_SAME_TYPE(decltype(abs(Ambiguous())), Ambiguous);
 
   static_assert(!has_abs<unsigned>::value, "");
   static_assert(!has_abs<unsigned long>::value, "");
@@ -137,260 +130,231 @@
   assert(abs(-1.) == 1);
 }
 
-void test_acos()
-{
-    static_assert((std::is_same<decltype(acosf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(acosl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(acos(Ambiguous())), Ambiguous>::value), "");
+void test_acos() {
+    ASSERT_SAME_TYPE(decltype(acosf(0)), float);
+    ASSERT_SAME_TYPE(decltype(acosl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(acos(Ambiguous())), Ambiguous);
     assert(acos(1) == 0);
 }
 
-void test_asin()
-{
-    static_assert((std::is_same<decltype(asinf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(asinl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(asin(Ambiguous())), Ambiguous>::value), "");
+void test_asin() {
+    ASSERT_SAME_TYPE(decltype(asinf(0)), float);
+    ASSERT_SAME_TYPE(decltype(asinl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(asin(Ambiguous())), Ambiguous);
     assert(asin(0) == 0);
 }
 
-void test_atan()
-{
-    static_assert((std::is_same<decltype(atanf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(atanl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(atan(Ambiguous())), Ambiguous>::value), "");
+void test_atan() {
+    ASSERT_SAME_TYPE(decltype(atanf(0)), float);
+    ASSERT_SAME_TYPE(decltype(atanl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(atan(Ambiguous())), Ambiguous);
     assert(atan(0) == 0);
 }
 
-void test_atan2()
-{
-    static_assert((std::is_same<decltype(atan2f(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(atan2l(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(atan2(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_atan2() {
+    ASSERT_SAME_TYPE(decltype(atan2f(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(atan2l(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(atan2(Ambiguous(), Ambiguous())), Ambiguous);
     assert(atan2(0,1) == 0);
 }
 
-void test_ceil()
-{
-    static_assert((std::is_same<decltype(ceilf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(ceill(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(ceil(Ambiguous())), Ambiguous>::value), "");
+void test_ceil() {
+    ASSERT_SAME_TYPE(decltype(ceilf(0)), float);
+    ASSERT_SAME_TYPE(decltype(ceill(0)), long double);
+    ASSERT_SAME_TYPE(decltype(ceil(Ambiguous())), Ambiguous);
     assert(ceil(0) == 0);
 }
 
-void test_cos()
-{
-    static_assert((std::is_same<decltype(cosf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(cosl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(cos(Ambiguous())), Ambiguous>::value), "");
+void test_cos() {
+    ASSERT_SAME_TYPE(decltype(cosf(0)), float);
+    ASSERT_SAME_TYPE(decltype(cosl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(cos(Ambiguous())), Ambiguous);
     assert(cos(0) == 1);
 }
 
-void test_cosh()
-{
-    static_assert((std::is_same<decltype(coshf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(coshl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(cosh(Ambiguous())), Ambiguous>::value), "");
+void test_cosh() {
+    ASSERT_SAME_TYPE(decltype(coshf(0)), float);
+    ASSERT_SAME_TYPE(decltype(coshl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(cosh(Ambiguous())), Ambiguous);
     assert(cosh(0) == 1);
 }
 
-void test_exp()
-{
-    static_assert((std::is_same<decltype(expf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(expl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(exp(Ambiguous())), Ambiguous>::value), "");
+void test_exp() {
+    ASSERT_SAME_TYPE(decltype(expf(0)), float);
+    ASSERT_SAME_TYPE(decltype(expl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(exp(Ambiguous())), Ambiguous);
     assert(exp(0) == 1);
 }
 
-void test_fabs()
-{
-    static_assert((std::is_same<decltype(fabsf(0.0f)), float>::value), "");
-    static_assert((std::is_same<decltype(fabsl(0.0L)), long double>::value), "");
-    static_assert((std::is_same<decltype(fabs(Ambiguous())), Ambiguous>::value), "");
+void test_fabs() {
+    ASSERT_SAME_TYPE(decltype(fabsf(0.0f)), float);
+    ASSERT_SAME_TYPE(decltype(fabsl(0.0L)), long double);
+    ASSERT_SAME_TYPE(decltype(fabs(Ambiguous())), Ambiguous);
     assert(fabs(-1) == 1);
 }
 
-void test_floor()
-{
-    static_assert((std::is_same<decltype(floorf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(floorl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(floor(Ambiguous())), Ambiguous>::value), "");
+void test_floor() {
+    ASSERT_SAME_TYPE(decltype(floorf(0)), float);
+    ASSERT_SAME_TYPE(decltype(floorl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(floor(Ambiguous())), Ambiguous);
     assert(floor(1) == 1);
 }
 
-void test_fmod()
-{
-    static_assert((std::is_same<decltype(fmodf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(fmodl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fmod(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_fmod() {
+    ASSERT_SAME_TYPE(decltype(fmodf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(fmodl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(fmod(Ambiguous(), Ambiguous())), Ambiguous);
     assert(fmod(1.5,1) == .5);
 }
 
-void test_frexp()
-{
+void test_frexp() {
     int ip;
-    static_assert((std::is_same<decltype(frexpf(0, &ip)), float>::value), "");
-    static_assert((std::is_same<decltype(frexpl(0, &ip)), long double>::value), "");
-    static_assert((std::is_same<decltype(frexp(Ambiguous(), &ip)), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(frexpf(0, &ip)), float);
+    ASSERT_SAME_TYPE(decltype(frexpl(0, &ip)), long double);
+    ASSERT_SAME_TYPE(decltype(frexp(Ambiguous(), &ip)), Ambiguous);
     assert(frexp(0, &ip) == 0);
 }
 
-void test_ldexp()
-{
+void test_ldexp() {
     int ip = 1;
-    static_assert((std::is_same<decltype(ldexpf(0, ip)), float>::value), "");
-    static_assert((std::is_same<decltype(ldexpl(0, ip)), long double>::value), "");
-    static_assert((std::is_same<decltype(ldexp(Ambiguous(), ip)), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(ldexpf(0, ip)), float);
+    ASSERT_SAME_TYPE(decltype(ldexpl(0, ip)), long double);
+    ASSERT_SAME_TYPE(decltype(ldexp(Ambiguous(), ip)), Ambiguous);
     assert(ldexp(1, ip) == 2);
 }
 
-void test_log()
-{
-    static_assert((std::is_same<decltype(logf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(logl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(log(Ambiguous())), Ambiguous>::value), "");
+void test_log() {
+    ASSERT_SAME_TYPE(decltype(logf(0)), float);
+    ASSERT_SAME_TYPE(decltype(logl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(log(Ambiguous())), Ambiguous);
     assert(log(1) == 0);
 }
 
-void test_log10()
-{
-    static_assert((std::is_same<decltype(log10f(0)), float>::value), "");
-    static_assert((std::is_same<decltype(log10l(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(log10(Ambiguous())), Ambiguous>::value), "");
+void test_log10() {
+    ASSERT_SAME_TYPE(decltype(log10f(0)), float);
+    ASSERT_SAME_TYPE(decltype(log10l(0)), long double);
+    ASSERT_SAME_TYPE(decltype(log10(Ambiguous())), Ambiguous);
     assert(log10(1) == 0);
 }
 
-void test_modf()
-{
-    static_assert((std::is_same<decltype(modf((float)0, (float*)0)), float>::value), "");
-    static_assert((std::is_same<decltype(modf((double)0, (double*)0)), double>::value), "");
-    static_assert((std::is_same<decltype(modf((long double)0, (long double*)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(modff(0, (float*)0)), float>::value), "");
-    static_assert((std::is_same<decltype(modfl(0, (long double*)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(modf(Ambiguous(), (Ambiguous*)0)), Ambiguous>::value), "");
+void test_modf() {
+    ASSERT_SAME_TYPE(decltype(modf((float)0, (float*)0)), float);
+    ASSERT_SAME_TYPE(decltype(modf((double)0, (double*)0)), double);
+    ASSERT_SAME_TYPE(decltype(modf((long double)0, (long double*)0)), long double);
+    ASSERT_SAME_TYPE(decltype(modff(0, (float*)0)), float);
+    ASSERT_SAME_TYPE(decltype(modfl(0, (long double*)0)), long double);
+    ASSERT_SAME_TYPE(decltype(modf(Ambiguous(), (Ambiguous*)0)), Ambiguous);
     double i;
     assert(modf(1., &i) == 0);
 }
 
-void test_pow()
-{
-    static_assert((std::is_same<decltype(powf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(powl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(pow((int)0, (int)0)), double>::value), "");
-//     static_assert((std::is_same<decltype(pow(Value<int>(), (int)0)), double>::value), "");
-//     static_assert((std::is_same<decltype(pow(Value<long double>(), (float)0)), long double>::value), "");
-//     static_assert((std::is_same<decltype(pow((float) 0, Value<float>())), float>::value), "");
-    static_assert((std::is_same<decltype(pow(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_pow() {
+    ASSERT_SAME_TYPE(decltype(powf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(powl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(pow((int)0, (int)0)), double);
+    // ASSERT_SAME_TYPE(decltype(pow(Value<int>(), (int)0)), double);
+    // ASSERT_SAME_TYPE(decltype(pow(Value<long double>(), (float)0)), long double);
+    // ASSERT_SAME_TYPE(decltype(pow((float) 0, Value<float>())), float);
+    ASSERT_SAME_TYPE(decltype(pow(Ambiguous(), Ambiguous())), Ambiguous);
     assert(pow(1,1) == 1);
-//     assert(pow(Value<int,1>(), Value<float,1>())  == 1);
-//     assert(pow(1.0f, Value<double,1>()) == 1);
-//     assert(pow(1.0, Value<int,1>()) == 1);
-//     assert(pow(Value<long double,1>(), 1LL) == 1);
+    // assert(pow(Value<int,1>(), Value<float,1>())  == 1);
+    // assert(pow(1.0f, Value<double,1>()) == 1);
+    // assert(pow(1.0, Value<int,1>()) == 1);
+    // assert(pow(Value<long double,1>(), 1LL) == 1);
 }
 
-void test_sin()
-{
-    static_assert((std::is_same<decltype(sinf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(sinl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(sin(Ambiguous())), Ambiguous>::value), "");
+void test_sin() {
+    ASSERT_SAME_TYPE(decltype(sinf(0)), float);
+    ASSERT_SAME_TYPE(decltype(sinl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(sin(Ambiguous())), Ambiguous);
     assert(sin(0) == 0);
 }
 
-void test_sinh()
-{
-    static_assert((std::is_same<decltype(sinhf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(sinhl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(sinh(Ambiguous())), Ambiguous>::value), "");
+void test_sinh() {
+    ASSERT_SAME_TYPE(decltype(sinhf(0)), float);
+    ASSERT_SAME_TYPE(decltype(sinhl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(sinh(Ambiguous())), Ambiguous);
     assert(sinh(0) == 0);
 }
 
-void test_sqrt()
-{
-    static_assert((std::is_same<decltype(sqrtf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(sqrtl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(sqrt(Ambiguous())), Ambiguous>::value), "");
+void test_sqrt() {
+    ASSERT_SAME_TYPE(decltype(sqrtf(0)), float);
+    ASSERT_SAME_TYPE(decltype(sqrtl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(sqrt(Ambiguous())), Ambiguous);
     assert(sqrt(4) == 2);
 }
 
-void test_tan()
-{
-    static_assert((std::is_same<decltype(tanf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(tanl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(tan(Ambiguous())), Ambiguous>::value), "");
+void test_tan() {
+    ASSERT_SAME_TYPE(decltype(tanf(0)), float);
+    ASSERT_SAME_TYPE(decltype(tanl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(tan(Ambiguous())), Ambiguous);
     assert(tan(0) == 0);
 }
 
-void test_tanh()
-{
-    static_assert((std::is_same<decltype(tanhf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(tanhl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(tanh(Ambiguous())), Ambiguous>::value), "");
+void test_tanh() {
+    ASSERT_SAME_TYPE(decltype(tanhf(0)), float);
+    ASSERT_SAME_TYPE(decltype(tanhl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(tanh(Ambiguous())), Ambiguous);
     assert(tanh(0) == 0);
 }
 
-void test_signbit()
-{
+void test_signbit() {
 #ifdef signbit
 #error signbit defined
 #endif
-    static_assert((std::is_same<decltype(signbit(Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(signbit(Ambiguous())), Ambiguous);
     assert(signbit(-1.0) == true);
 }
 
-void test_fpclassify()
-{
+void test_fpclassify() {
 #ifdef fpclassify
 #error fpclassify defined
 #endif
-    static_assert((std::is_same<decltype(fpclassify(Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(fpclassify(Ambiguous())), Ambiguous);
     assert(fpclassify(-1.0) == FP_NORMAL);
 }
 
-void test_isfinite()
-{
+void test_isfinite() {
 #ifdef isfinite
 #error isfinite defined
 #endif
-    static_assert((std::is_same<decltype(isfinite(Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isfinite(Ambiguous())), Ambiguous);
     assert(isfinite(-1.0) == true);
 }
 
-void test_isnormal()
-{
+void test_isnormal() {
 #ifdef isnormal
 #error isnormal defined
 #endif
-    static_assert((std::is_same<decltype(isnormal(Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isnormal(Ambiguous())), Ambiguous);
     assert(isnormal(-1.0) == true);
 }
 
-void test_isgreater()
-{
+void test_isgreater() {
 #ifdef isgreater
 #error isgreater defined
 #endif
-    static_assert((std::is_same<decltype(isgreater(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isgreater(Ambiguous(), Ambiguous())), Ambiguous);
     assert(isgreater(-1.0, 0.F) == false);
 }
 
-void test_isgreaterequal()
-{
+void test_isgreaterequal() {
 #ifdef isgreaterequal
 #error isgreaterequal defined
 #endif
-    static_assert((std::is_same<decltype(isgreaterequal(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isgreaterequal(Ambiguous(), Ambiguous())), Ambiguous);
     assert(isgreaterequal(-1.0, 0.F) == false);
 }
 
-void test_isinf()
-{
+void test_isinf() {
 #ifdef isinf
 #error isinf defined
 #endif
-    static_assert((std::is_same<decltype(isinf((float)0)), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(isinf((float)0)), bool);
 
     typedef decltype(isinf((double)0)) DoubleRetType;
 #ifndef __linux__
-    static_assert((std::is_same<DoubleRetType, bool>::value), "");
+    ASSERT_SAME_TYPE(DoubleRetType, bool);
 #else
     // GLIBC < 2.26 defines 'isinf(double)' with a return type of 'int' in
     // all C++ dialects. The test should tolerate this.
@@ -399,48 +363,44 @@
                 || std::is_same<DoubleRetType, int>::value), "");
 #endif
 
-    static_assert((std::is_same<decltype(isinf(0)), bool>::value), "");
-    static_assert((std::is_same<decltype(isinf((long double)0)), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(isinf(0)), bool);
+    ASSERT_SAME_TYPE(decltype(isinf((long double)0)), bool);
     assert(isinf(-1.0) == false);
 }
 
-void test_isless()
-{
+void test_isless() {
 #ifdef isless
 #error isless defined
 #endif
-    static_assert((std::is_same<decltype(isless(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isless(Ambiguous(), Ambiguous())), Ambiguous);
     assert(isless(-1.0, 0.F) == true);
 }
 
-void test_islessequal()
-{
+void test_islessequal() {
 #ifdef islessequal
 #error islessequal defined
 #endif
-    static_assert((std::is_same<decltype(islessequal(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(islessequal(Ambiguous(), Ambiguous())), Ambiguous);
     assert(islessequal(-1.0, 0.F) == true);
 }
 
-void test_islessgreater()
-{
+void test_islessgreater() {
 #ifdef islessgreater
 #error islessgreater defined
 #endif
-    static_assert((std::is_same<decltype(islessgreater(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(islessgreater(Ambiguous(), Ambiguous())), Ambiguous);
     assert(islessgreater(-1.0, 0.F) == true);
 }
 
-void test_isnan()
-{
+void test_isnan() {
 #ifdef isnan
 #error isnan defined
 #endif
-    static_assert((std::is_same<decltype(isnan((float)0)), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(isnan((float)0)), bool);
 
     typedef decltype(isnan((double)0)) DoubleRetType;
 #ifndef __linux__
-    static_assert((std::is_same<DoubleRetType, bool>::value), "");
+    ASSERT_SAME_TYPE(DoubleRetType, bool);
 #else
     // GLIBC < 2.26 defines 'isnan(double)' with a return type of 'int' in
     // all C++ dialects. The test should tolerate this.
@@ -449,353 +409,316 @@
                 || std::is_same<DoubleRetType, int>::value), "");
 #endif
 
-    static_assert((std::is_same<decltype(isnan(0)), bool>::value), "");
-    static_assert((std::is_same<decltype(isnan((long double)0)), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(isnan(0)), bool);
+    ASSERT_SAME_TYPE(decltype(isnan((long double)0)), bool);
     assert(isnan(-1.0) == false);
 }
 
-void test_isunordered()
-{
+void test_isunordered() {
 #ifdef isunordered
 #error isunordered defined
 #endif
-    static_assert((std::is_same<decltype(isunordered(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(isunordered(Ambiguous(), Ambiguous())), Ambiguous);
     assert(isunordered(-1.0, 0.F) == false);
 }
 
-void test_acosh()
-{
-    static_assert((std::is_same<decltype(acoshf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(acoshl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(acosh(Ambiguous())), Ambiguous>::value), "");
+void test_acosh() {
+    ASSERT_SAME_TYPE(decltype(acoshf(0)), float);
+    ASSERT_SAME_TYPE(decltype(acoshl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(acosh(Ambiguous())), Ambiguous);
     assert(acosh(1) == 0);
 }
 
-void test_asinh()
-{
-    static_assert((std::is_same<decltype(asinhf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(asinhl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(asinh(Ambiguous())), Ambiguous>::value), "");
+void test_asinh() {
+    ASSERT_SAME_TYPE(decltype(asinhf(0)), float);
+    ASSERT_SAME_TYPE(decltype(asinhl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(asinh(Ambiguous())), Ambiguous);
     assert(asinh(0) == 0);
 }
 
-void test_atanh()
-{
-    static_assert((std::is_same<decltype(atanhf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(atanhl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(atanh(Ambiguous())), Ambiguous>::value), "");
+void test_atanh() {
+    ASSERT_SAME_TYPE(decltype(atanhf(0)), float);
+    ASSERT_SAME_TYPE(decltype(atanhl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(atanh(Ambiguous())), Ambiguous);
     assert(atanh(0) == 0);
 }
 
 void test_cbrt() {
-    static_assert((std::is_same<decltype(cbrtf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(cbrtl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(cbrt(Ambiguous())), Ambiguous>::value),
-                  "");
+    ASSERT_SAME_TYPE(decltype(cbrtf(0)), float);
+    ASSERT_SAME_TYPE(decltype(cbrtl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(cbrt(Ambiguous())), Ambiguous);
     assert(truncate_fp(cbrt(1)) == 1);
-
 }
 
-void test_copysign()
-{
-    static_assert((std::is_same<decltype(copysignf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(copysignl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(copysign((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(copysign(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_copysign() {
+    ASSERT_SAME_TYPE(decltype(copysignf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(copysignl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(copysign((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(copysign(Ambiguous(), Ambiguous())), Ambiguous);
     assert(copysign(1,1) == 1);
 }
 
-void test_erf()
-{
-    static_assert((std::is_same<decltype(erff(0)), float>::value), "");
-    static_assert((std::is_same<decltype(erfl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(erf(Ambiguous())), Ambiguous>::value), "");
+void test_erf() {
+    ASSERT_SAME_TYPE(decltype(erff(0)), float);
+    ASSERT_SAME_TYPE(decltype(erfl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(erf(Ambiguous())), Ambiguous);
     assert(erf(0) == 0);
 }
 
-void test_erfc()
-{
-    static_assert((std::is_same<decltype(erfcf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(erfcl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(erfc(Ambiguous())), Ambiguous>::value), "");
+void test_erfc() {
+    ASSERT_SAME_TYPE(decltype(erfcf(0)), float);
+    ASSERT_SAME_TYPE(decltype(erfcl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(erfc(Ambiguous())), Ambiguous);
     assert(erfc(0) == 1);
 }
 
-void test_exp2()
-{
-    static_assert((std::is_same<decltype(exp2f(0)), float>::value), "");
-    static_assert((std::is_same<decltype(exp2l(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(exp2(Ambiguous())), Ambiguous>::value), "");
+void test_exp2() {
+    ASSERT_SAME_TYPE(decltype(exp2f(0)), float);
+    ASSERT_SAME_TYPE(decltype(exp2l(0)), long double);
+    ASSERT_SAME_TYPE(decltype(exp2(Ambiguous())), Ambiguous);
     assert(exp2(1) == 2);
 }
 
-void test_expm1()
-{
-    static_assert((std::is_same<decltype(expm1f(0)), float>::value), "");
-    static_assert((std::is_same<decltype(expm1l(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(expm1(Ambiguous())), Ambiguous>::value), "");
+void test_expm1() {
+    ASSERT_SAME_TYPE(decltype(expm1f(0)), float);
+    ASSERT_SAME_TYPE(decltype(expm1l(0)), long double);
+    ASSERT_SAME_TYPE(decltype(expm1(Ambiguous())), Ambiguous);
     assert(expm1(0) == 0);
 }
 
-void test_fdim()
-{
-    static_assert((std::is_same<decltype(fdimf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(fdiml(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fdim((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fdim(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_fdim() {
+    ASSERT_SAME_TYPE(decltype(fdimf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(fdiml(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(fdim((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(fdim(Ambiguous(), Ambiguous())), Ambiguous);
     assert(fdim(1,0) == 1);
 }
 
-void test_fma()
-{
-    static_assert((std::is_same<decltype(fma((bool)0, (float)0, (float)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fma((float)0, (float)0, (double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fma((float)0, (float)0, (long double)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fma((float)0, (float)0, (float)0)), float>::value), "");
+void test_fma() {
+    ASSERT_SAME_TYPE(decltype(fma((bool)0, (float)0, (float)0)), double);
+    ASSERT_SAME_TYPE(decltype(fma((float)0, (float)0, (double)0)), double);
+    ASSERT_SAME_TYPE(decltype(fma((float)0, (float)0, (long double)0)), long double);
+    ASSERT_SAME_TYPE(decltype(fma((float)0, (float)0, (float)0)), float);
 
-    static_assert((std::is_same<decltype(fma((bool)0, (double)0, (double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fma((double)0, (double)0, (float)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fma((double)0, (double)0, (long double)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fma((double)0, (double)0,  (double)0)), double>::value), "");
+    ASSERT_SAME_TYPE(decltype(fma((bool)0, (double)0, (double)0)), double);
+    ASSERT_SAME_TYPE(decltype(fma((double)0, (double)0, (float)0)), double);
+    ASSERT_SAME_TYPE(decltype(fma((double)0, (double)0, (long double)0)), long double);
+    ASSERT_SAME_TYPE(decltype(fma((double)0, (double)0,  (double)0)), double);
 
-    static_assert((std::is_same<decltype(fma((long double)0, (long double)0, (float)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fma((double)0, (long double)0, (long double)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fma((long double)0, (long double)0, (long double)0)), long double>::value), "");
+    ASSERT_SAME_TYPE(decltype(fma((long double)0, (long double)0, (float)0)), long double);
+    ASSERT_SAME_TYPE(decltype(fma((double)0, (long double)0, (long double)0)), long double);
+    ASSERT_SAME_TYPE(decltype(fma((long double)0, (long double)0, (long double)0)), long double);
 
-    static_assert((std::is_same<decltype(fmaf(0,0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(fmal(0,0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fma(Ambiguous(), Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(fmaf(0,0,0)), float);
+    ASSERT_SAME_TYPE(decltype(fmal(0,0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(fma(Ambiguous(), Ambiguous(), Ambiguous())), Ambiguous);
     assert(fma(1,1,1) == 2);
 }
 
-void test_fmax()
-{
-    static_assert((std::is_same<decltype(fmaxf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(fmaxl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fmax((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fmax(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_fmax() {
+    ASSERT_SAME_TYPE(decltype(fmaxf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(fmaxl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(fmax((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(fmax(Ambiguous(), Ambiguous())), Ambiguous);
     assert(fmax(1,0) == 1);
 }
 
-void test_fmin()
-{
-    static_assert((std::is_same<decltype(fminf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(fminl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(fmin((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(fmin(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_fmin() {
+    ASSERT_SAME_TYPE(decltype(fminf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(fminl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(fmin((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(fmin(Ambiguous(), Ambiguous())), Ambiguous);
     assert(fmin(1,0) == 0);
 }
 
-void test_hypot()
-{
-    static_assert((std::is_same<decltype(hypotf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(hypotl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(hypot((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(hypot(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_hypot() {
+    ASSERT_SAME_TYPE(decltype(hypotf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(hypotl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(hypot((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(hypot(Ambiguous(), Ambiguous())), Ambiguous);
     assert(hypot(3,4) == 5);
 }
 
-void test_ilogb()
-{
-    static_assert((std::is_same<decltype(ilogbf(0)), int>::value), "");
-    static_assert((std::is_same<decltype(ilogbl(0)), int>::value), "");
-    static_assert((std::is_same<decltype(ilogb(Ambiguous())), Ambiguous>::value), "");
+void test_ilogb() {
+    ASSERT_SAME_TYPE(decltype(ilogbf(0)), int);
+    ASSERT_SAME_TYPE(decltype(ilogbl(0)), int);
+    ASSERT_SAME_TYPE(decltype(ilogb(Ambiguous())), Ambiguous);
     assert(ilogb(1) == 0);
 }
 
-void test_lgamma()
-{
-    static_assert((std::is_same<decltype(lgammaf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(lgammal(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(lgamma(Ambiguous())), Ambiguous>::value), "");
+void test_lgamma() {
+    ASSERT_SAME_TYPE(decltype(lgammaf(0)), float);
+    ASSERT_SAME_TYPE(decltype(lgammal(0)), long double);
+    ASSERT_SAME_TYPE(decltype(lgamma(Ambiguous())), Ambiguous);
     assert(lgamma(1) == 0);
 }
 
-void test_llrint()
-{
-    static_assert((std::is_same<decltype(llrintf(0)), long long>::value), "");
-    static_assert((std::is_same<decltype(llrintl(0)), long long>::value), "");
-    static_assert((std::is_same<decltype(llrint(Ambiguous())), Ambiguous>::value), "");
+void test_llrint() {
+    ASSERT_SAME_TYPE(decltype(llrintf(0)), long long);
+    ASSERT_SAME_TYPE(decltype(llrintl(0)), long long);
+    ASSERT_SAME_TYPE(decltype(llrint(Ambiguous())), Ambiguous);
     assert(llrint(1) == 1LL);
 }
 
-void test_llround()
-{
-    static_assert((std::is_same<decltype(llroundf(0)), long long>::value), "");
-    static_assert((std::is_same<decltype(llroundl(0)), long long>::value), "");
-    static_assert((std::is_same<decltype(llround(Ambiguous())), Ambiguous>::value), "");
+void test_llround() {
+    ASSERT_SAME_TYPE(decltype(llroundf(0)), long long);
+    ASSERT_SAME_TYPE(decltype(llroundl(0)), long long);
+    ASSERT_SAME_TYPE(decltype(llround(Ambiguous())), Ambiguous);
     assert(llround(1) == 1LL);
 }
 
-void test_log1p()
-{
-    static_assert((std::is_same<decltype(log1pf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(log1pl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(log1p(Ambiguous())), Ambiguous>::value), "");
+void test_log1p() {
+    ASSERT_SAME_TYPE(decltype(log1pf(0)), float);
+    ASSERT_SAME_TYPE(decltype(log1pl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(log1p(Ambiguous())), Ambiguous);
     assert(log1p(0) == 0);
 }
 
-void test_log2()
-{
-    static_assert((std::is_same<decltype(log2f(0)), float>::value), "");
-    static_assert((std::is_same<decltype(log2l(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(log2(Ambiguous())), Ambiguous>::value), "");
+void test_log2() {
+    ASSERT_SAME_TYPE(decltype(log2f(0)), float);
+    ASSERT_SAME_TYPE(decltype(log2l(0)), long double);
+    ASSERT_SAME_TYPE(decltype(log2(Ambiguous())), Ambiguous);
     assert(log2(1) == 0);
 }
 
-void test_logb()
-{
-    static_assert((std::is_same<decltype(logbf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(logbl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(logb(Ambiguous())), Ambiguous>::value), "");
+void test_logb() {
+    ASSERT_SAME_TYPE(decltype(logbf(0)), float);
+    ASSERT_SAME_TYPE(decltype(logbl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(logb(Ambiguous())), Ambiguous);
     assert(logb(1) == 0);
 }
 
-void test_lrint()
-{
-    static_assert((std::is_same<decltype(lrintf(0)), long>::value), "");
-    static_assert((std::is_same<decltype(lrintl(0)), long>::value), "");
-    static_assert((std::is_same<decltype(lrint(Ambiguous())), Ambiguous>::value), "");
+void test_lrint() {
+    ASSERT_SAME_TYPE(decltype(lrintf(0)), long);
+    ASSERT_SAME_TYPE(decltype(lrintl(0)), long);
+    ASSERT_SAME_TYPE(decltype(lrint(Ambiguous())), Ambiguous);
     assert(lrint(1) == 1L);
 }
 
-void test_lround()
-{
-    static_assert((std::is_same<decltype(lroundf(0)), long>::value), "");
-    static_assert((std::is_same<decltype(lroundl(0)), long>::value), "");
-    static_assert((std::is_same<decltype(lround(Ambiguous())), Ambiguous>::value), "");
+void test_lround() {
+    ASSERT_SAME_TYPE(decltype(lroundf(0)), long);
+    ASSERT_SAME_TYPE(decltype(lroundl(0)), long);
+    ASSERT_SAME_TYPE(decltype(lround(Ambiguous())), Ambiguous);
     assert(lround(1) == 1L);
 }
 
-void test_nan()
-{
-    static_assert((std::is_same<decltype(nan("")), double>::value), "");
-    static_assert((std::is_same<decltype(nanf("")), float>::value), "");
-    static_assert((std::is_same<decltype(nanl("")), long double>::value), "");
+void test_nan() {
+    ASSERT_SAME_TYPE(decltype(nan("")), double);
+    ASSERT_SAME_TYPE(decltype(nanf("")), float);
+    ASSERT_SAME_TYPE(decltype(nanl("")), long double);
 }
 
-void test_nearbyint()
-{
-    static_assert((std::is_same<decltype(nearbyintf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(nearbyintl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(nearbyint(Ambiguous())), Ambiguous>::value), "");
+void test_nearbyint() {
+    ASSERT_SAME_TYPE(decltype(nearbyintf(0)), float);
+    ASSERT_SAME_TYPE(decltype(nearbyintl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(nearbyint(Ambiguous())), Ambiguous);
     assert(nearbyint(1) == 1);
 }
 
-void test_nextafter()
-{
-    static_assert((std::is_same<decltype(nextafterf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(nextafterl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(nextafter((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nextafter(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_nextafter() {
+    ASSERT_SAME_TYPE(decltype(nextafterf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(nextafterl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(nextafter((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(nextafter(Ambiguous(), Ambiguous())), Ambiguous);
     assert(nextafter(0,1) == hexfloat<double>(0x1, 0, -1074));
 }
 
-void test_nexttoward()
-{
-    static_assert((std::is_same<decltype(nexttoward((float)0, (long double)0)), float>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((bool)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((unsigned short)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((int)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((unsigned int)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((long)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((unsigned long)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((long long)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((unsigned long long)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((double)0, (long double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward((long double)0, (long double)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(nexttowardf(0, (long double)0)), float>::value), "");
-    static_assert((std::is_same<decltype(nexttowardl(0, (long double)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(nexttoward(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_nexttoward() {
+    ASSERT_SAME_TYPE(decltype(nexttoward((float)0, (long double)0)), float);
+    ASSERT_SAME_TYPE(decltype(nexttoward((bool)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((unsigned short)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((int)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((unsigned int)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((long)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((unsigned long)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((long long)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((unsigned long long)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((double)0, (long double)0)), double);
+    ASSERT_SAME_TYPE(decltype(nexttoward((long double)0, (long double)0)), long double);
+    ASSERT_SAME_TYPE(decltype(nexttowardf(0, (long double)0)), float);
+    ASSERT_SAME_TYPE(decltype(nexttowardl(0, (long double)0)), long double);
+    ASSERT_SAME_TYPE(decltype(nexttoward(Ambiguous(), Ambiguous())), Ambiguous);
     assert(nexttoward(0, 1) == hexfloat<double>(0x1, 0, -1074));
 }
 
-void test_remainder()
-{
-    static_assert((std::is_same<decltype(remainderf(0,0)), float>::value), "");
-    static_assert((std::is_same<decltype(remainderl(0,0)), long double>::value), "");
-    static_assert((std::is_same<decltype(remainder((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(remainder(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_remainder() {
+    ASSERT_SAME_TYPE(decltype(remainderf(0,0)), float);
+    ASSERT_SAME_TYPE(decltype(remainderl(0,0)), long double);
+    ASSERT_SAME_TYPE(decltype(remainder((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(remainder(Ambiguous(), Ambiguous())), Ambiguous);
     assert(remainder(0.5,1) == 0.5);
 }
 
-void test_remquo()
-{
+void test_remquo() {
     int ip;
-    static_assert((std::is_same<decltype(remquof(0,0, &ip)), float>::value), "");
-    static_assert((std::is_same<decltype(remquol(0,0, &ip)), long double>::value), "");
-    static_assert((std::is_same<decltype(remquo((int)0, (int)0, &ip)), double>::value), "");
-    static_assert((std::is_same<decltype(remquo(Ambiguous(), Ambiguous(), &ip)), Ambiguous>::value), "");
+    ASSERT_SAME_TYPE(decltype(remquof(0,0, &ip)), float);
+    ASSERT_SAME_TYPE(decltype(remquol(0,0, &ip)), long double);
+    ASSERT_SAME_TYPE(decltype(remquo((int)0, (int)0, &ip)), double);
+    ASSERT_SAME_TYPE(decltype(remquo(Ambiguous(), Ambiguous(), &ip)), Ambiguous);
     assert(remquo(0.5,1, &ip) == 0.5);
 }
 
-void test_rint()
-{
-    static_assert((std::is_same<decltype(rintf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(rintl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(rint(Ambiguous())), Ambiguous>::value), "");
+void test_rint() {
+    ASSERT_SAME_TYPE(decltype(rintf(0)), float);
+    ASSERT_SAME_TYPE(decltype(rintl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(rint(Ambiguous())), Ambiguous);
     assert(rint(1) == 1);
 }
 
-void test_round()
-{
-    static_assert((std::is_same<decltype(roundf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(roundl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(round(Ambiguous())), Ambiguous>::value), "");
+void test_round() {
+    ASSERT_SAME_TYPE(decltype(roundf(0)), float);
+    ASSERT_SAME_TYPE(decltype(roundl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(round(Ambiguous())), Ambiguous);
     assert(round(1) == 1);
 }
 
-void test_scalbln()
-{
-    static_assert((std::is_same<decltype(scalbln((float)0, (long)0)), float>::value), "");
-    static_assert((std::is_same<decltype(scalbln((bool)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((unsigned short)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((int)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((unsigned int)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((long)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((unsigned long)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((long long)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((unsigned long long)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((double)0, (long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbln((long double)0, (long)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(scalblnf(0, (long)0)), float>::value), "");
-    static_assert((std::is_same<decltype(scalblnl(0, (long)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(scalbln(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_scalbln() {
+    ASSERT_SAME_TYPE(decltype(scalbln((float)0, (long)0)), float);
+    ASSERT_SAME_TYPE(decltype(scalbln((bool)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((unsigned short)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((int)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((unsigned int)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((long)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((unsigned long)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((long long)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((unsigned long long)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((double)0, (long)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbln((long double)0, (long)0)), long double);
+    ASSERT_SAME_TYPE(decltype(scalblnf(0, (long)0)), float);
+    ASSERT_SAME_TYPE(decltype(scalblnl(0, (long)0)), long double);
+    ASSERT_SAME_TYPE(decltype(scalbln(Ambiguous(), Ambiguous())), Ambiguous);
     assert(scalbln(1, 1) == 2);
 }
 
-void test_scalbn()
-{
-    static_assert((std::is_same<decltype(scalbn((float)0, (int)0)), float>::value), "");
-    static_assert((std::is_same<decltype(scalbn((bool)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((unsigned short)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((unsigned int)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((long)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((unsigned long)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((long long)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((unsigned long long)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((double)0, (int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(scalbn((long double)0, (int)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(scalbnf(0, (int)0)), float>::value), "");
-    static_assert((std::is_same<decltype(scalbnl(0, (int)0)), long double>::value), "");
-    static_assert((std::is_same<decltype(scalbn(Ambiguous(), Ambiguous())), Ambiguous>::value), "");
+void test_scalbn() {
+    ASSERT_SAME_TYPE(decltype(scalbn((float)0, (int)0)), float);
+    ASSERT_SAME_TYPE(decltype(scalbn((bool)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((unsigned short)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((unsigned int)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((long)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((unsigned long)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((long long)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((unsigned long long)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((double)0, (int)0)), double);
+    ASSERT_SAME_TYPE(decltype(scalbn((long double)0, (int)0)), long double);
+    ASSERT_SAME_TYPE(decltype(scalbnf(0, (int)0)), float);
+    ASSERT_SAME_TYPE(decltype(scalbnl(0, (int)0)), long double);
+    ASSERT_SAME_TYPE(decltype(scalbn(Ambiguous(), Ambiguous())), Ambiguous);
     assert(scalbn(1, 1) == 2);
 }
 
-void test_tgamma()
-{
-    static_assert((std::is_same<decltype(tgammaf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(tgammal(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(tgamma(Ambiguous())), Ambiguous>::value), "");
+void test_tgamma() {
+    ASSERT_SAME_TYPE(decltype(tgammaf(0)), float);
+    ASSERT_SAME_TYPE(decltype(tgammal(0)), long double);
+    ASSERT_SAME_TYPE(decltype(tgamma(Ambiguous())), Ambiguous);
     assert(tgamma(1) == 1);
 }
 
-void test_trunc()
-{
-    static_assert((std::is_same<decltype(truncf(0)), float>::value), "");
-    static_assert((std::is_same<decltype(truncl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(trunc(Ambiguous())), Ambiguous>::value), "");
+void test_trunc() {
+    ASSERT_SAME_TYPE(decltype(truncf(0)), float);
+    ASSERT_SAME_TYPE(decltype(truncl(0)), long double);
+    ASSERT_SAME_TYPE(decltype(trunc(Ambiguous())), Ambiguous);
     assert(trunc(1) == 1);
 }
 
@@ -803,94 +726,94 @@
 struct test_single_arg {
   template <class T = Arg>
   void operator()() {
-    static_assert((std::is_same<decltype(::acos(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::acos(T())), PromoteResult);
     (void)::acos(T());
-    static_assert((std::is_same<decltype(::asin(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::asin(T())), PromoteResult);
     (void)::asin(T());
-    static_assert((std::is_same<decltype(::atan(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::atan(T())), PromoteResult);
     (void)::atan(T());
-    static_assert((std::is_same<decltype(::ceil(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::ceil(T())), PromoteResult);
     (void)::ceil(T());
-    static_assert((std::is_same<decltype(::cos(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::cos(T())), PromoteResult);
     (void)::cos(T());
-    static_assert((std::is_same<decltype(::cosh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::cosh(T())), PromoteResult);
     (void)::cosh(T());
-    static_assert((std::is_same<decltype(::exp(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::exp(T())), PromoteResult);
     (void)::exp(T());
-    static_assert((std::is_same<decltype(::fabs(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fabs(T())), PromoteResult);
     (void)::fabs(T());
-    static_assert((std::is_same<decltype(::floor(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::floor(T())), PromoteResult);
     (void)::floor(T());
     int ip;
-    static_assert((std::is_same<decltype(::frexp(T(), &ip)), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::frexp(T(), &ip)), PromoteResult);
     (void)::frexp(T(), &ip);
-    static_assert((std::is_same<decltype(::ldexp(T(), ip)), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::ldexp(T(), ip)), PromoteResult);
     (void)::ldexp(T(), ip);
-    static_assert((std::is_same<decltype(::log(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::log(T())), PromoteResult);
     (void)::log(T());
-    static_assert((std::is_same<decltype(::log10(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::log10(T())), PromoteResult);
     (void)::log10(T());
-    static_assert((std::is_same<decltype(::sin(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::sin(T())), PromoteResult);
     (void)::sin(T());
-    static_assert((std::is_same<decltype(::sinh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::sinh(T())), PromoteResult);
     (void)::sinh(T());
-    static_assert((std::is_same<decltype(::sqrt(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::sqrt(T())), PromoteResult);
     (void)::sqrt(T());
-    static_assert((std::is_same<decltype(::tan(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::tan(T())), PromoteResult);
     (void)::tan(T());
-    static_assert((std::is_same<decltype(::tanh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::tanh(T())), PromoteResult);
     (void)::tanh(T());
-    static_assert((std::is_same<decltype(::signbit(T())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::signbit(T())), bool);
     (void)::signbit(T());
-    static_assert((std::is_same<decltype(::fpclassify(T())), int>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fpclassify(T())), int);
     (void)::fpclassify(T());
-    static_assert((std::is_same<decltype(::isfinite(T())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isfinite(T())), bool);
     (void)::isfinite(T());
-    static_assert((std::is_same<decltype(::isnormal(T())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isnormal(T())), bool);
     (void)::isnormal(T());
-    static_assert((std::is_same<decltype(::acosh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::acosh(T())), PromoteResult);
     (void)::acosh(T());
-    static_assert((std::is_same<decltype(::asinh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::asinh(T())), PromoteResult);
     (void)::asinh(T());
-    static_assert((std::is_same<decltype(::atanh(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::atanh(T())), PromoteResult);
     (void)::atanh(T());
-    static_assert((std::is_same<decltype(::cbrt(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::cbrt(T())), PromoteResult);
     (void)::cbrt(T());
-    static_assert((std::is_same<decltype(::erf(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::erf(T())), PromoteResult);
     (void)::erf(T());
-    static_assert((std::is_same<decltype(::erfc(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::erfc(T())), PromoteResult);
     (void)::erfc(T());
-    static_assert((std::is_same<decltype(::exp2(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::exp2(T())), PromoteResult);
     (void)::exp2(T());
-    static_assert((std::is_same<decltype(::expm1(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::expm1(T())), PromoteResult);
     (void)::expm1(T());
-    static_assert((std::is_same<decltype(::ilogb(T())), int>::value), "");
+    ASSERT_SAME_TYPE(decltype(::ilogb(T())), int);
     (void)::ilogb(T());
-    static_assert((std::is_same<decltype(::lgamma(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::lgamma(T())), PromoteResult);
     (void)::lgamma(T());
-    static_assert((std::is_same<decltype(::llrint(T())), long long>::value), "");
+    ASSERT_SAME_TYPE(decltype(::llrint(T())), long long);
     (void)::llrint(T());
-    static_assert((std::is_same<decltype(::llround(T())), long long>::value), "");
+    ASSERT_SAME_TYPE(decltype(::llround(T())), long long);
     (void)::llround(T());
-    static_assert((std::is_same<decltype(::log1p(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::log1p(T())), PromoteResult);
     (void)::log1p(T());
-    static_assert((std::is_same<decltype(::log2(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::log2(T())), PromoteResult);
     (void)::log2(T());
-    static_assert((std::is_same<decltype(::logb(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::logb(T())), PromoteResult);
     (void)::logb(T());
-    static_assert((std::is_same<decltype(::lrint(T())), long>::value), "");
+    ASSERT_SAME_TYPE(decltype(::lrint(T())), long);
     (void)::lrint(T());
-    static_assert((std::is_same<decltype(::lround(T())), long>::value), "");
+    ASSERT_SAME_TYPE(decltype(::lround(T())), long);
     (void)::lround(T());
-    static_assert((std::is_same<decltype(::nearbyint(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::nearbyint(T())), PromoteResult);
     (void)::nearbyint(T());
-    static_assert((std::is_same<decltype(::rint(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::rint(T())), PromoteResult);
     (void)::rint(T());
-    static_assert((std::is_same<decltype(::round(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::round(T())), PromoteResult);
     (void)::round(T());
-    static_assert((std::is_same<decltype(::trunc(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::trunc(T())), PromoteResult);
     (void)::trunc(T());
-    static_assert((std::is_same<decltype(::tgamma(T())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::tgamma(T())), PromoteResult);
     (void)::tgamma(T());
   }
 };
@@ -899,40 +822,40 @@
 struct test_two_args {
   template <class T = Arg1, class U = Arg2>
   void operator()() {
-    static_assert((std::is_same<decltype(::atan2(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::atan2(T(), U())), PromoteResult);
     (void)::atan2(T(), U());
-    static_assert((std::is_same<decltype(::fmod(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fmod(T(), U())), PromoteResult);
     (void)::fmod(T(), U());
-    static_assert((std::is_same<decltype(::pow(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::pow(T(), U())), PromoteResult);
     (void)::pow(T(), U());
-    static_assert((std::is_same<decltype(::isgreater(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isgreater(T(), U())), bool);
     (void)::isgreater(T(), U());
-    static_assert((std::is_same<decltype(::isgreaterequal(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isgreaterequal(T(), U())), bool);
     (void)::isgreaterequal(T(), U());
-    static_assert((std::is_same<decltype(::isless(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isless(T(), U())), bool);
     (void)::isless(T(), U());
-    static_assert((std::is_same<decltype(::islessequal(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::islessequal(T(), U())), bool);
     (void)::islessequal(T(), U());
-    static_assert((std::is_same<decltype(::islessgreater(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::islessgreater(T(), U())), bool);
     (void)::islessgreater(T(), U());
-    static_assert((std::is_same<decltype(::isunordered(T(), U())), bool>::value), "");
+    ASSERT_SAME_TYPE(decltype(::isunordered(T(), U())), bool);
     (void)::isunordered(T(), U());
-    static_assert((std::is_same<decltype(::copysign(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::copysign(T(), U())), PromoteResult);
     (void)::copysign(T(), U());
-    static_assert((std::is_same<decltype(::fdim(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fdim(T(), U())), PromoteResult);
     (void)::fdim(T(), U());
-    static_assert((std::is_same<decltype(::fmax(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fmax(T(), U())), PromoteResult);
     (void)::fmax(T(), U());
-    static_assert((std::is_same<decltype(::fmin(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fmin(T(), U())), PromoteResult);
     (void)::fmin(T(), U());
-    static_assert((std::is_same<decltype(::hypot(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::hypot(T(), U())), PromoteResult);
     (void)::hypot(T(), U());
-    static_assert((std::is_same<decltype(::nextafter(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::nextafter(T(), U())), PromoteResult);
     (void)::nextafter(T(), U());
-    static_assert((std::is_same<decltype(::remainder(T(), U())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::remainder(T(), U())), PromoteResult);
     (void)::remainder(T(), U());
     int ip;
-    static_assert((std::is_same<decltype(::remquo(T(), U(), &ip)), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::remquo(T(), U(), &ip)), PromoteResult);
     ::remquo(T(), U(), &ip);
   }
 };
@@ -941,59 +864,58 @@
 struct test_three_args {
   template <class T = Arg1, class U = Arg2, class V = Arg3>
   void operator()() {
-    static_assert((std::is_same<decltype(::fma(T(), U(), V())), PromoteResult>::value), "");
+    ASSERT_SAME_TYPE(decltype(::fma(T(), U(), V())), PromoteResult);
     (void)::fma(T(), U(), V());
   }
 };
 
 struct CallTwoArgs {
-  using integral_float_double = meta::concatenate_t<meta::integral_types, meta::type_list<float, double> >;
+  using integral_float_double = types::concatenate_t<types::integral_types, types::type_list<float, double> >;
 
   template <class Arg2>
   void operator()() {
-    meta::for_each(integral_float_double(), test_two_args</*PromoteResult=*/double, /*Iterate*/void, Arg2>());
+    types::for_each(integral_float_double(), test_two_args</*PromoteResult=*/double, /*Iterate*/void, Arg2>());
   }
 };
 
 template <class T>
 struct CallThreeArgs {
-  using integral_float_double = meta::concatenate_t<meta::integral_types, meta::type_list<float, double> >;
+  using integral_float_double = types::concatenate_t<types::integral_types, types::type_list<float, double> >;
 
   template <class Arg3>
   struct Helper {
 
     template <class Arg2>
     void operator()() {
-      meta::for_each(integral_float_double(), test_three_args</*PromoteResult=*/double, /*Iterate*/void, Arg2, Arg3>());
+      types::for_each(integral_float_double(), test_three_args</*PromoteResult=*/double, /*Iterate*/void, Arg2, Arg3>());
     }
   };
 
   template <class Arg3>
   void operator()() {
-    meta::for_each(integral_float_double(), Helper<Arg3>());
+    types::for_each(integral_float_double(), Helper<Arg3>());
   }
 };
 
-int main(int, char**)
-{
-  meta::for_each(meta::integral_types(), test_single_arg</*PromoteResult=*/double>());
+int main(int, char**) {
+  types::for_each(types::integral_types(), test_single_arg</*PromoteResult=*/double>());
   test_single_arg</*PromoteResult=*/float, /*Arg=*/float>();
   test_single_arg</*PromoteResult=*/double, /*Arg=*/double>();
   test_single_arg</*PromoteResult=*/long double, /*Arg=*/long double>();
 
-  meta::for_each(meta::integral_types(), CallTwoArgs());
+  types::for_each(types::integral_types(), CallTwoArgs());
 
-  meta::for_each(
-      meta::integral_types(), test_two_args</*PromoteResult=*/long double, /*Arg1=*/void, /*Arg2=*/long double>());
+  types::for_each(
+      types::integral_types(), test_two_args</*PromoteResult=*/long double, /*Arg1=*/void, /*Arg2=*/long double>());
 
   test_two_args</*PromoteResult=*/float, /*Args=*/float, float>();
   test_two_args</*PromoteResult=*/float, /*Args=*/double, double>();
   test_two_args</*PromoteResult=*/double, /*Args=*/float, double>();
   test_two_args</*PromoteResult=*/double, /*Args=*/double, double>();
 
-  meta::for_each(meta::integral_types(), CallThreeArgs<double>());
-  meta::for_each(
-      meta::integral_types(), test_three_args</*PromoteResult=*/long double, /*Iterate*/ void, long double, double>());
+  types::for_each(types::integral_types(), CallThreeArgs<double>());
+  types::for_each(
+      types::integral_types(), test_three_args</*PromoteResult=*/long double, /*Iterate*/ void, long double, double>());
 
   test_three_args</*PromoteResult=*/float, /*Args=*/float, float, float>();
   test_three_args</*PromoteResult=*/double, /*Args=*/double, double, double>();
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.compile.pass.cpp
similarity index 72%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.compile.pass.cpp
index 92dc58c..7a49a85 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.compile.pass.cpp
@@ -6,16 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
+// test <setjmp.h>
 
-#include <complex.h>
+#include <setjmp.h>
 
 #include "test_macros.h"
 
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
+#ifndef setjmp
+#error setjmp not defined
+#endif
 
-  return 0;
-}
+jmp_buf jb;
+ASSERT_SAME_TYPE(void, decltype(longjmp(jb, 0)));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.pass.cpp
deleted file mode 100644
index 3c93801..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/setjmp_h.pass.cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// test <setjmp.h>
-
-#include <setjmp.h>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef setjmp
-#error setjmp not defined
-#endif
-
-int main(int, char**)
-{
-    jmp_buf jb;
-    ((void)jb); // Prevent unused warning
-    static_assert((std::is_same<decltype(longjmp(jb, 0)), void>::value),
-                  "std::is_same<decltype(longjmp(jb, 0)), void>::value");
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.compile.pass.cpp
similarity index 75%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.compile.pass.cpp
index 07a729e..ace2eea 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/signal_h.compile.pass.cpp
@@ -9,7 +9,6 @@
 // test <signal.h>
 
 #include <signal.h>
-#include <type_traits>
 
 #include "test_macros.h"
 
@@ -49,12 +48,7 @@
 #error SIGTERM not defined
 #endif
 
-int main(int, char**)
-{
-    sig_atomic_t sig; ((void)sig);
-    typedef void (*func)(int);
-    static_assert((std::is_same<decltype(signal(0, (func)0)), func>::value), "");
-    static_assert((std::is_same<decltype(raise(0)), int>::value), "");
-
-  return 0;
-}
+sig_atomic_t sig;
+typedef void (*func)(int);
+ASSERT_SAME_TYPE(func, decltype(signal(0, (func)0)));
+ASSERT_SAME_TYPE(int,  decltype(raise(0)));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.compile.pass.cpp
similarity index 90%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.compile.pass.cpp
index feb9c4a..8ded0f9 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdarg_h.compile.pass.cpp
@@ -30,10 +30,4 @@
 #error va_start not defined
 #endif
 
-int main(int, char**)
-{
-    va_list va;
-    ((void)va);
-
-  return 0;
-}
+va_list va;
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.compile.pass.cpp
similarity index 90%
rename from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.compile.pass.cpp
index ca580a8..79d8b51 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdbool_h.compile.pass.cpp
@@ -10,8 +10,6 @@
 
 #include <stdbool.h>
 
-#include "test_macros.h"
-
 #ifndef __bool_true_false_are_defined
 #error __bool_true_false_are_defined not defined
 #endif
@@ -27,9 +25,3 @@
 #ifdef false
 #error false should not be defined
 #endif
-
-int main(int, char**)
-{
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.compile.pass.cpp
new file mode 100644
index 0000000..fed867f
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.compile.pass.cpp
@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <stddef.h>
+
+#include <stddef.h>
+
+#include "test_macros.h"
+
+void use() {
+    // Make sure we can use the following types without including anything else
+    (void)sizeof(size_t);
+    (void)sizeof(ptrdiff_t);
+#if TEST_STD_VER >= 11
+    (void)sizeof(nullptr);
+    (void)sizeof(nullptr_t);
+    (void)sizeof(max_align_t);
+#endif
+}
+
+#ifndef NULL
+#error NULL not defined
+#endif
+
+#ifndef offsetof
+#error offsetof not defined
+#endif
+
+#include <type_traits>
+
+static_assert(sizeof(size_t) == sizeof(void*), "");
+static_assert(std::is_unsigned<size_t>::value, "");
+static_assert(std::is_integral<size_t>::value, "");
+static_assert(sizeof(ptrdiff_t) == sizeof(void*), "");
+static_assert(std::is_signed<ptrdiff_t>::value, "");
+static_assert(std::is_integral<ptrdiff_t>::value, "");
+static_assert((std::is_same<decltype(nullptr), nullptr_t>::value), "");
+static_assert(sizeof(nullptr_t) == sizeof(void*), "");
+#if TEST_STD_VER >= 11
+#  if TEST_STD_VER >= 20
+// P0767
+static_assert(std::is_trivial<max_align_t>::value, "");
+static_assert(std::is_standard_layout<max_align_t>::value, "");
+#  else
+static_assert(std::is_pod<max_align_t>::value, "");
+#  endif
+static_assert(std::alignment_of<max_align_t>::value >= std::alignment_of<long long>::value, "");
+static_assert(std::alignment_of<max_align_t>::value >= std::alignment_of<long double>::value, "");
+static_assert(std::alignment_of<max_align_t>::value >= std::alignment_of<void*>::value, "");
+#endif // TEST_STD_VER >= 11
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.nullptr.pass.cpp
similarity index 68%
copy from third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
copy to third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.nullptr.pass.cpp
index 1efeba1..52cd7e6 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.nullptr.pass.cpp
@@ -6,10 +6,20 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03
+// <stddef.h>
 
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
+#include <stddef.h>
+#include <cassert>
+
 int main(int, char**) {
-  return 0;
+    {
+        void *p = NULL;
+        assert(!p);
+    }
+    {
+        void *p = nullptr;
+        assert(!p);
+    }
+
+    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.pass.cpp
deleted file mode 100644
index 1fe48b5..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stddef_h.pass.cpp
+++ /dev/null
@@ -1,72 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <stddef.h>
-
-#include <stddef.h>
-#include <cassert>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef NULL
-#error NULL not defined
-#endif
-
-#ifndef offsetof
-#error offsetof not defined
-#endif
-
-int main(int, char**)
-{
-    void *p = NULL;
-    assert(!p);
-
-    static_assert(sizeof(size_t) == sizeof(void*),
-                  "sizeof(size_t) == sizeof(void*)");
-    static_assert(std::is_unsigned<size_t>::value,
-                  "std::is_unsigned<size_t>::value");
-    static_assert(std::is_integral<size_t>::value,
-                  "std::is_integral<size_t>::value");
-    static_assert(sizeof(ptrdiff_t) == sizeof(void*),
-                  "sizeof(ptrdiff_t) == sizeof(void*)");
-    static_assert(std::is_signed<ptrdiff_t>::value,
-                  "std::is_signed<ptrdiff_t>::value");
-    static_assert(std::is_integral<ptrdiff_t>::value,
-                  "std::is_integral<ptrdiff_t>::value");
-    static_assert((std::is_same<decltype(nullptr), nullptr_t>::value),
-                  "decltype(nullptr) == nullptr_t");
-    static_assert(sizeof(nullptr_t) == sizeof(void*),
-                  "sizeof(nullptr_t) == sizeof(void*)");
-#if TEST_STD_VER >= 11
-#if TEST_STD_VER > 17
-//   P0767
-    static_assert(std::is_trivial<max_align_t>::value,
-                  "std::is_trivial<max_align_t>::value");
-    static_assert(std::is_standard_layout<max_align_t>::value,
-                  "std::is_standard_layout<max_align_t>::value");
-#else
-    static_assert(std::is_pod<max_align_t>::value,
-                  "std::is_pod<max_align_t>::value");
-#endif
-    static_assert((std::alignment_of<max_align_t>::value >=
-                  std::alignment_of<long long>::value),
-                  "std::alignment_of<max_align_t>::value >= "
-                  "std::alignment_of<long long>::value");
-    static_assert(std::alignment_of<max_align_t>::value >=
-                  std::alignment_of<long double>::value,
-                  "std::alignment_of<max_align_t>::value >= "
-                  "std::alignment_of<long double>::value");
-    static_assert(std::alignment_of<max_align_t>::value >=
-                  std::alignment_of<void*>::value,
-                  "std::alignment_of<max_align_t>::value >= "
-                  "std::alignment_of<void*>::value");
-#endif
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdint_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdint_h.pass.cpp
index 37945ee..080efcd 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdint_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdint_h.pass.cpp
@@ -9,6 +9,45 @@
 // test <stdint.h>
 
 #include <stdint.h>
+
+void use() {
+    // Make sure we can use the following types without including anything else
+    (void)sizeof(int8_t);
+    (void)sizeof(int16_t);
+    (void)sizeof(int32_t);
+    (void)sizeof(int64_t);
+
+    (void)sizeof(uint8_t);
+    (void)sizeof(uint16_t);
+    (void)sizeof(uint32_t);
+    (void)sizeof(uint64_t);
+
+    (void)sizeof(int_least8_t);
+    (void)sizeof(int_least16_t);
+    (void)sizeof(int_least32_t);
+    (void)sizeof(int_least64_t);
+
+    (void)sizeof(uint_least8_t);
+    (void)sizeof(uint_least16_t);
+    (void)sizeof(uint_least32_t);
+    (void)sizeof(uint_least64_t);
+
+    (void)sizeof(int_fast8_t);
+    (void)sizeof(int_fast16_t);
+    (void)sizeof(int_fast32_t);
+    (void)sizeof(int_fast64_t);
+
+    (void)sizeof(uint_fast8_t);
+    (void)sizeof(uint_fast16_t);
+    (void)sizeof(uint_fast32_t);
+    (void)sizeof(uint_fast64_t);
+
+    (void)sizeof(intptr_t);
+    (void)sizeof(uintptr_t);
+    (void)sizeof(intmax_t);
+    (void)sizeof(uintmax_t);
+}
+
 #include <cstddef>
 #include <csignal>
 #include <climits>
@@ -22,191 +61,134 @@
 #   include <cwctype>
 #endif
 
-int main(int, char**)
-{
+int main(int, char**) {
     // typedef int8_t
-    static_assert(sizeof(int8_t)*CHAR_BIT == 8,
-                 "sizeof(int8_t)*CHAR_BIT == 8");
-    static_assert(std::is_signed<int8_t>::value,
-                 "std::is_signed<int8_t>::value");
+    static_assert(sizeof(int8_t)*CHAR_BIT == 8, "");
+    static_assert(std::is_signed<int8_t>::value, "");
     // typedef int16_t
-    static_assert(sizeof(int16_t)*CHAR_BIT == 16,
-                 "sizeof(int16_t)*CHAR_BIT == 16");
-    static_assert(std::is_signed<int16_t>::value,
-                 "std::is_signed<int16_t>::value");
+    static_assert(sizeof(int16_t)*CHAR_BIT == 16, "");
+    static_assert(std::is_signed<int16_t>::value, "");
     // typedef int32_t
-    static_assert(sizeof(int32_t)*CHAR_BIT == 32,
-                 "sizeof(int32_t)*CHAR_BIT == 32");
-    static_assert(std::is_signed<int32_t>::value,
-                 "std::is_signed<int32_t>::value");
+    static_assert(sizeof(int32_t)*CHAR_BIT == 32, "");
+    static_assert(std::is_signed<int32_t>::value, "");
     // typedef int64_t
-    static_assert(sizeof(int64_t)*CHAR_BIT == 64,
-                 "sizeof(int64_t)*CHAR_BIT == 64");
-    static_assert(std::is_signed<int64_t>::value,
-                 "std::is_signed<int64_t>::value");
+    static_assert(sizeof(int64_t)*CHAR_BIT == 64, "");
+    static_assert(std::is_signed<int64_t>::value, "");
 
     // typedef uint8_t
-    static_assert(sizeof(uint8_t)*CHAR_BIT == 8,
-                 "sizeof(uint8_t)*CHAR_BIT == 8");
-    static_assert(std::is_unsigned<uint8_t>::value,
-                 "std::is_unsigned<uint8_t>::value");
+    static_assert(sizeof(uint8_t)*CHAR_BIT == 8, "");
+    static_assert(std::is_unsigned<uint8_t>::value, "");
     // typedef uint16_t
-    static_assert(sizeof(uint16_t)*CHAR_BIT == 16,
-                 "sizeof(uint16_t)*CHAR_BIT == 16");
-    static_assert(std::is_unsigned<uint16_t>::value,
-                 "std::is_unsigned<uint16_t>::value");
+    static_assert(sizeof(uint16_t)*CHAR_BIT == 16, "");
+    static_assert(std::is_unsigned<uint16_t>::value, "");
     // typedef uint32_t
-    static_assert(sizeof(uint32_t)*CHAR_BIT == 32,
-                 "sizeof(uint32_t)*CHAR_BIT == 32");
-    static_assert(std::is_unsigned<uint32_t>::value,
-                 "std::is_unsigned<uint32_t>::value");
+    static_assert(sizeof(uint32_t)*CHAR_BIT == 32, "");
+    static_assert(std::is_unsigned<uint32_t>::value, "");
     // typedef uint64_t
-    static_assert(sizeof(uint64_t)*CHAR_BIT == 64,
-                 "sizeof(uint64_t)*CHAR_BIT == 64");
-    static_assert(std::is_unsigned<uint64_t>::value,
-                 "std::is_unsigned<uint64_t>::value");
+    static_assert(sizeof(uint64_t)*CHAR_BIT == 64, "");
+    static_assert(std::is_unsigned<uint64_t>::value, "");
 
     // typedef int_least8_t
-    static_assert(sizeof(int_least8_t)*CHAR_BIT >= 8,
-                 "sizeof(int_least8_t)*CHAR_BIT >= 8");
-    static_assert(std::is_signed<int_least8_t>::value,
-                 "std::is_signed<int_least8_t>::value");
+    static_assert(sizeof(int_least8_t)*CHAR_BIT >= 8, "");
+    static_assert(std::is_signed<int_least8_t>::value, "");
     // typedef int_least16_t
-    static_assert(sizeof(int_least16_t)*CHAR_BIT >= 16,
-                 "sizeof(int_least16_t)*CHAR_BIT >= 16");
-    static_assert(std::is_signed<int_least16_t>::value,
-                 "std::is_signed<int_least16_t>::value");
+    static_assert(sizeof(int_least16_t)*CHAR_BIT >= 16, "");
+    static_assert(std::is_signed<int_least16_t>::value, "");
     // typedef int_least32_t
-    static_assert(sizeof(int_least32_t)*CHAR_BIT >= 32,
-                 "sizeof(int_least32_t)*CHAR_BIT >= 32");
-    static_assert(std::is_signed<int_least32_t>::value,
-                 "std::is_signed<int_least32_t>::value");
+    static_assert(sizeof(int_least32_t)*CHAR_BIT >= 32, "");
+    static_assert(std::is_signed<int_least32_t>::value, "");
     // typedef int_least64_t
-    static_assert(sizeof(int_least64_t)*CHAR_BIT >= 64,
-                 "sizeof(int_least64_t)*CHAR_BIT >= 64");
-    static_assert(std::is_signed<int_least64_t>::value,
-                 "std::is_signed<int_least64_t>::value");
+    static_assert(sizeof(int_least64_t)*CHAR_BIT >= 64, "");
+    static_assert(std::is_signed<int_least64_t>::value, "");
 
     // typedef uint_least8_t
-    static_assert(sizeof(uint_least8_t)*CHAR_BIT >= 8,
-                 "sizeof(uint_least8_t)*CHAR_BIT >= 8");
-    static_assert(std::is_unsigned<uint_least8_t>::value,
-                 "std::is_unsigned<uint_least8_t>::value");
+    static_assert(sizeof(uint_least8_t)*CHAR_BIT >= 8, "");
+    static_assert(std::is_unsigned<uint_least8_t>::value, "");
     // typedef uint_least16_t
-    static_assert(sizeof(uint_least16_t)*CHAR_BIT >= 16,
-                 "sizeof(uint_least16_t)*CHAR_BIT >= 16");
-    static_assert(std::is_unsigned<uint_least16_t>::value,
-                 "std::is_unsigned<uint_least16_t>::value");
+    static_assert(sizeof(uint_least16_t)*CHAR_BIT >= 16, "");
+    static_assert(std::is_unsigned<uint_least16_t>::value, "");
     // typedef uint_least32_t
-    static_assert(sizeof(uint_least32_t)*CHAR_BIT >= 32,
-                 "sizeof(uint_least32_t)*CHAR_BIT >= 32");
-    static_assert(std::is_unsigned<uint_least32_t>::value,
-                 "std::is_unsigned<uint_least32_t>::value");
+    static_assert(sizeof(uint_least32_t)*CHAR_BIT >= 32, "");
+    static_assert(std::is_unsigned<uint_least32_t>::value, "");
     // typedef uint_least64_t
-    static_assert(sizeof(uint_least64_t)*CHAR_BIT >= 64,
-                 "sizeof(uint_least64_t)*CHAR_BIT >= 64");
-    static_assert(std::is_unsigned<uint_least64_t>::value,
-                 "std::is_unsigned<uint_least64_t>::value");
+    static_assert(sizeof(uint_least64_t)*CHAR_BIT >= 64, "");
+    static_assert(std::is_unsigned<uint_least64_t>::value, "");
 
     // typedef int_fast8_t
-    static_assert(sizeof(int_fast8_t)*CHAR_BIT >= 8,
-                 "sizeof(int_fast8_t)*CHAR_BIT >= 8");
-    static_assert(std::is_signed<int_fast8_t>::value,
-                 "std::is_signed<int_fast8_t>::value");
+    static_assert(sizeof(int_fast8_t)*CHAR_BIT >= 8, "");
+    static_assert(std::is_signed<int_fast8_t>::value, "");
     // typedef int_fast16_t
-    static_assert(sizeof(int_fast16_t)*CHAR_BIT >= 16,
-                 "sizeof(int_fast16_t)*CHAR_BIT >= 16");
-    static_assert(std::is_signed<int_fast16_t>::value,
-                 "std::is_signed<int_fast16_t>::value");
+    static_assert(sizeof(int_fast16_t)*CHAR_BIT >= 16, "");
+    static_assert(std::is_signed<int_fast16_t>::value, "");
     // typedef int_fast32_t
-    static_assert(sizeof(int_fast32_t)*CHAR_BIT >= 32,
-                 "sizeof(int_fast32_t)*CHAR_BIT >= 32");
-    static_assert(std::is_signed<int_fast32_t>::value,
-                 "std::is_signed<int_fast32_t>::value");
+    static_assert(sizeof(int_fast32_t)*CHAR_BIT >= 32, "");
+    static_assert(std::is_signed<int_fast32_t>::value, "");
     // typedef int_fast64_t
-    static_assert(sizeof(int_fast64_t)*CHAR_BIT >= 64,
-                 "sizeof(int_fast64_t)*CHAR_BIT >= 64");
-    static_assert(std::is_signed<int_fast64_t>::value,
-                 "std::is_signed<int_fast64_t>::value");
+    static_assert(sizeof(int_fast64_t)*CHAR_BIT >= 64, "");
+    static_assert(std::is_signed<int_fast64_t>::value, "");
 
     // typedef uint_fast8_t
-    static_assert(sizeof(uint_fast8_t)*CHAR_BIT >= 8,
-                 "sizeof(uint_fast8_t)*CHAR_BIT >= 8");
-    static_assert(std::is_unsigned<uint_fast8_t>::value,
-                 "std::is_unsigned<uint_fast8_t>::value");
+    static_assert(sizeof(uint_fast8_t)*CHAR_BIT >= 8, "");
+    static_assert(std::is_unsigned<uint_fast8_t>::value, "");
     // typedef uint_fast16_t
-    static_assert(sizeof(uint_fast16_t)*CHAR_BIT >= 16,
-                 "sizeof(uint_fast16_t)*CHAR_BIT >= 16");
-    static_assert(std::is_unsigned<uint_fast16_t>::value,
-                 "std::is_unsigned<uint_fast16_t>::value");
+    static_assert(sizeof(uint_fast16_t)*CHAR_BIT >= 16, "");
+    static_assert(std::is_unsigned<uint_fast16_t>::value, "");
     // typedef uint_fast32_t
-    static_assert(sizeof(uint_fast32_t)*CHAR_BIT >= 32,
-                 "sizeof(uint_fast32_t)*CHAR_BIT >= 32");
-    static_assert(std::is_unsigned<uint_fast32_t>::value,
-                 "std::is_unsigned<uint_fast32_t>::value");
+    static_assert(sizeof(uint_fast32_t)*CHAR_BIT >= 32, "");
+    static_assert(std::is_unsigned<uint_fast32_t>::value, "");
     // typedef uint_fast64_t
-    static_assert(sizeof(uint_fast64_t)*CHAR_BIT >= 64,
-                 "sizeof(uint_fast64_t)*CHAR_BIT >= 64");
-    static_assert(std::is_unsigned<uint_fast64_t>::value,
-                 "std::is_unsigned<uint_fast64_t>::value");
+    static_assert(sizeof(uint_fast64_t)*CHAR_BIT >= 64, "");
+    static_assert(std::is_unsigned<uint_fast64_t>::value, "");
 
     // typedef intptr_t
-    static_assert(sizeof(intptr_t) >= sizeof(void*),
-                 "sizeof(intptr_t) >= sizeof(void*)");
-    static_assert(std::is_signed<intptr_t>::value,
-                 "std::is_signed<intptr_t>::value");
+    static_assert(sizeof(intptr_t) >= sizeof(void*), "");
+    static_assert(std::is_signed<intptr_t>::value, "");
     // typedef uintptr_t
-    static_assert(sizeof(uintptr_t) >= sizeof(void*),
-                 "sizeof(uintptr_t) >= sizeof(void*)");
-    static_assert(std::is_unsigned<uintptr_t>::value,
-                 "std::is_unsigned<uintptr_t>::value");
+    static_assert(sizeof(uintptr_t) >= sizeof(void*), "");
+    static_assert(std::is_unsigned<uintptr_t>::value, "");
 
     // typedef intmax_t
-    static_assert(sizeof(intmax_t) >= sizeof(long long),
-                 "sizeof(intmax_t) >= sizeof(long long)");
-    static_assert(std::is_signed<intmax_t>::value,
-                 "std::is_signed<intmax_t>::value");
+    static_assert(sizeof(intmax_t) >= sizeof(long long), "");
+    static_assert(std::is_signed<intmax_t>::value, "");
     // typedef uintmax_t
-    static_assert(sizeof(uintmax_t) >= sizeof(unsigned long long),
-                 "sizeof(uintmax_t) >= sizeof(unsigned long long)");
-    static_assert(std::is_unsigned<uintmax_t>::value,
-                 "std::is_unsigned<uintmax_t>::value");
+    static_assert(sizeof(uintmax_t) >= sizeof(unsigned long long), "");
+    static_assert(std::is_unsigned<uintmax_t>::value, "");
 
     // INTN_MIN
-    static_assert(INT8_MIN == -128, "INT8_MIN == -128");
-    static_assert(INT16_MIN == -32768, "INT16_MIN == -32768");
-    static_assert(INT32_MIN == -2147483647 - 1, "INT32_MIN == -2147483648");
-    static_assert(INT64_MIN == -9223372036854775807LL - 1, "INT64_MIN == -9223372036854775808LL");
+    static_assert(INT8_MIN == -128, "");
+    static_assert(INT16_MIN == -32768, "");
+    static_assert(INT32_MIN == -2147483647 - 1, "");
+    static_assert(INT64_MIN == -9223372036854775807LL - 1, "");
 
     // INTN_MAX
-    static_assert(INT8_MAX == 127, "INT8_MAX == 127");
-    static_assert(INT16_MAX == 32767, "INT16_MAX == 32767");
-    static_assert(INT32_MAX == 2147483647, "INT32_MAX == 2147483647");
-    static_assert(INT64_MAX == 9223372036854775807LL, "INT64_MAX == 9223372036854775807LL");
+    static_assert(INT8_MAX == 127, "");
+    static_assert(INT16_MAX == 32767, "");
+    static_assert(INT32_MAX == 2147483647, "");
+    static_assert(INT64_MAX == 9223372036854775807LL, "");
 
     // UINTN_MAX
-    static_assert(UINT8_MAX == 255, "UINT8_MAX == 255");
-    static_assert(UINT16_MAX == 65535, "UINT16_MAX == 65535");
-    static_assert(UINT32_MAX == 4294967295U, "UINT32_MAX == 4294967295");
-    static_assert(UINT64_MAX == 18446744073709551615ULL, "UINT64_MAX == 18446744073709551615ULL");
+    static_assert(UINT8_MAX == 255, "");
+    static_assert(UINT16_MAX == 65535, "");
+    static_assert(UINT32_MAX == 4294967295U, "");
+    static_assert(UINT64_MAX == 18446744073709551615ULL, "");
 
     // INT_FASTN_MIN
-    static_assert(INT_FAST8_MIN <= -128, "INT_FAST8_MIN <= -128");
-    static_assert(INT_FAST16_MIN <= -32768, "INT_FAST16_MIN <= -32768");
-    static_assert(INT_FAST32_MIN <= -2147483647 - 1, "INT_FAST32_MIN <= -2147483648");
-    static_assert(INT_FAST64_MIN <= -9223372036854775807LL - 1, "INT_FAST64_MIN <= -9223372036854775808LL");
+    static_assert(INT_FAST8_MIN <= -128, "");
+    static_assert(INT_FAST16_MIN <= -32768, "");
+    static_assert(INT_FAST32_MIN <= -2147483647 - 1, "");
+    static_assert(INT_FAST64_MIN <= -9223372036854775807LL - 1, "");
 
     // INT_FASTN_MAX
-    static_assert(INT_FAST8_MAX >= 127, "INT_FAST8_MAX >= 127");
-    static_assert(INT_FAST16_MAX >= 32767, "INT_FAST16_MAX >= 32767");
-    static_assert(INT_FAST32_MAX >= 2147483647, "INT_FAST32_MAX >= 2147483647");
-    static_assert(INT_FAST64_MAX >= 9223372036854775807LL, "INT_FAST64_MAX >= 9223372036854775807LL");
+    static_assert(INT_FAST8_MAX >= 127, "");
+    static_assert(INT_FAST16_MAX >= 32767, "");
+    static_assert(INT_FAST32_MAX >= 2147483647, "");
+    static_assert(INT_FAST64_MAX >= 9223372036854775807LL, "");
 
     // UINT_FASTN_MAX
-    static_assert(UINT_FAST8_MAX >= 255, "UINT_FAST8_MAX >= 255");
-    static_assert(UINT_FAST16_MAX >= 65535, "UINT_FAST16_MAX >= 65535");
-    static_assert(UINT_FAST32_MAX >= 4294967295U, "UINT_FAST32_MAX >= 4294967295");
-    static_assert(UINT_FAST64_MAX >= 18446744073709551615ULL, "UINT_FAST64_MAX >= 18446744073709551615ULL");
+    static_assert(UINT_FAST8_MAX >= 255, "");
+    static_assert(UINT_FAST16_MAX >= 65535, "");
+    static_assert(UINT_FAST32_MAX >= 4294967295U, "");
+    static_assert(UINT_FAST64_MAX >= 18446744073709551615ULL, "");
 
     // INTPTR_MIN
     assert(INTPTR_MIN == std::numeric_limits<intptr_t>::min());
@@ -295,5 +277,5 @@
 #error UINTMAX_C not defined
 #endif
 
-  return 0;
+    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.compile.pass.cpp
new file mode 100644
index 0000000..27a9762
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.compile.pass.cpp
@@ -0,0 +1,176 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// test <stdio.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "test_macros.h"
+
+#ifdef getc
+#error getc is defined
+#endif
+
+#ifdef putc
+#error putc is defined
+#endif
+
+#ifdef clearerr
+#error clearerr is defined
+#endif
+
+#ifdef feof
+#error feof is defined
+#endif
+
+#ifdef ferror
+#error ferror is defined
+#endif
+
+#ifndef BUFSIZ
+#error BUFSIZ not defined
+#endif
+
+#ifndef EOF
+#error EOF not defined
+#endif
+
+#ifndef FILENAME_MAX
+#error FILENAME_MAX not defined
+#endif
+
+#ifndef FOPEN_MAX
+#error FOPEN_MAX not defined
+#endif
+
+#ifndef L_tmpnam
+#error L_tmpnam not defined
+#endif
+
+#ifndef NULL
+#error NULL not defined
+#endif
+
+#ifndef SEEK_CUR
+#error SEEK_CUR not defined
+#endif
+
+#ifndef SEEK_END
+#error SEEK_END not defined
+#endif
+
+#ifndef SEEK_SET
+#error SEEK_SET not defined
+#endif
+
+#ifndef TMP_MAX
+#error TMP_MAX not defined
+#endif
+
+#ifndef _IOFBF
+#error _IOFBF not defined
+#endif
+
+#ifndef _IOLBF
+#error _IOLBF not defined
+#endif
+
+#ifndef _IONBF
+#error _IONBF not defined
+#endif
+
+#ifndef stderr
+#error stderr not defined
+#endif
+
+#ifndef stdin
+#error stdin not defined
+#endif
+
+#ifndef stdout
+#error stdout not defined
+#endif
+
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wformat-zero-length")
+TEST_GCC_DIAGNOSTIC_IGNORED("-Wformat-zero-length")
+
+FILE* fp = 0;
+fpos_t fpos = fpos_t();
+size_t s = 0;
+char* cp = 0;
+char arr[] = {'a', 'b'};
+va_list va;
+ASSERT_SAME_TYPE(int,    decltype(remove("")));
+ASSERT_SAME_TYPE(int,    decltype(rename("","")));
+ASSERT_SAME_TYPE(FILE*,  decltype(tmpfile()));
+TEST_DIAGNOSTIC_PUSH
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+ASSERT_SAME_TYPE(char*,  decltype(tmpnam(cp)));
+TEST_DIAGNOSTIC_POP
+ASSERT_SAME_TYPE(int,    decltype(fclose(fp)));
+ASSERT_SAME_TYPE(int,    decltype(fflush(fp)));
+ASSERT_SAME_TYPE(FILE*,  decltype(fopen("", "")));
+ASSERT_SAME_TYPE(FILE*,  decltype(freopen("", "", fp)));
+ASSERT_SAME_TYPE(void,   decltype(setbuf(fp,cp)));
+ASSERT_SAME_TYPE(int,    decltype(vfprintf(fp,"",va)));
+ASSERT_SAME_TYPE(int,    decltype(fprintf(fp," ")));
+ASSERT_SAME_TYPE(int,    decltype(fscanf(fp,"")));
+ASSERT_SAME_TYPE(int,    decltype(printf("\n")));
+ASSERT_SAME_TYPE(int,    decltype(scanf("\n")));
+ASSERT_SAME_TYPE(int,    decltype(snprintf(cp,0,"p")));
+TEST_DIAGNOSTIC_PUSH
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+ASSERT_SAME_TYPE(int,    decltype(sprintf(cp," ")));
+TEST_DIAGNOSTIC_POP
+ASSERT_SAME_TYPE(int,    decltype(sscanf("","")));
+ASSERT_SAME_TYPE(int,    decltype(vfprintf(fp,"",va)));
+ASSERT_SAME_TYPE(int,    decltype(vfscanf(fp,"",va)));
+ASSERT_SAME_TYPE(int,    decltype(vprintf(" ",va)));
+ASSERT_SAME_TYPE(int,    decltype(vscanf("",va)));
+ASSERT_SAME_TYPE(int,    decltype(vsnprintf(cp,0," ",va)));
+TEST_DIAGNOSTIC_PUSH
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+ASSERT_SAME_TYPE(int,    decltype(vsprintf(cp," ",va)));
+TEST_DIAGNOSTIC_POP
+ASSERT_SAME_TYPE(int,    decltype(vsscanf("","",va)));
+ASSERT_SAME_TYPE(int,    decltype(fgetc(fp)));
+ASSERT_SAME_TYPE(char*,  decltype(fgets(cp,0,fp)));
+ASSERT_SAME_TYPE(int,    decltype(fputc(0,fp)));
+ASSERT_SAME_TYPE(int,    decltype(fputs("",fp)));
+ASSERT_SAME_TYPE(int,    decltype(getc(fp)));
+ASSERT_SAME_TYPE(int,    decltype(getchar()));
+#if TEST_STD_VER < 14
+TEST_DIAGNOSTIC_PUSH
+TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
+ASSERT_SAME_TYPE(char*,  decltype(gets(cp)));
+TEST_DIAGNOSTIC_POP
+#endif
+ASSERT_SAME_TYPE(int,    decltype(putc(0,fp)));
+ASSERT_SAME_TYPE(int,    decltype(putchar(0)));
+ASSERT_SAME_TYPE(int,    decltype(puts("")));
+ASSERT_SAME_TYPE(int,    decltype(ungetc(0,fp)));
+ASSERT_SAME_TYPE(size_t, decltype(fread((void*)0,0,0,fp)));
+ASSERT_SAME_TYPE(size_t, decltype(fwrite((const void*)arr,1,0,fp)));
+#ifndef TEST_HAS_NO_FGETPOS_FSETPOS
+ASSERT_SAME_TYPE(int,    decltype(fgetpos(fp, &fpos)));
+#endif
+ASSERT_SAME_TYPE(int,    decltype(fseek(fp, 0,0)));
+#ifndef TEST_HAS_NO_FGETPOS_FSETPOS
+ASSERT_SAME_TYPE(int,    decltype(fsetpos(fp, &fpos)));
+#endif
+ASSERT_SAME_TYPE(long,   decltype(ftell(fp)));
+ASSERT_SAME_TYPE(void,   decltype(rewind(fp)));
+ASSERT_SAME_TYPE(void,   decltype(clearerr(fp)));
+ASSERT_SAME_TYPE(int,    decltype(feof(fp)));
+ASSERT_SAME_TYPE(int,    decltype(ferror(fp)));
+ASSERT_SAME_TYPE(void,   decltype(perror("")));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.pass.cpp
deleted file mode 100644
index effb633..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.pass.cpp
+++ /dev/null
@@ -1,188 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// test <stdio.h>
-
-#include <stdio.h>
-#include <type_traits>
-#include "test_macros.h"
-
-#ifdef getc
-#error getc is defined
-#endif
-
-#ifdef putc
-#error putc is defined
-#endif
-
-#ifdef clearerr
-#error clearerr is defined
-#endif
-
-#ifdef feof
-#error feof is defined
-#endif
-
-#ifdef ferror
-#error ferror is defined
-#endif
-
-#ifndef BUFSIZ
-#error BUFSIZ not defined
-#endif
-
-#ifndef EOF
-#error EOF not defined
-#endif
-
-#ifndef FILENAME_MAX
-#error FILENAME_MAX not defined
-#endif
-
-#ifndef FOPEN_MAX
-#error FOPEN_MAX not defined
-#endif
-
-#ifndef L_tmpnam
-#error L_tmpnam not defined
-#endif
-
-#ifndef NULL
-#error NULL not defined
-#endif
-
-#ifndef SEEK_CUR
-#error SEEK_CUR not defined
-#endif
-
-#ifndef SEEK_END
-#error SEEK_END not defined
-#endif
-
-#ifndef SEEK_SET
-#error SEEK_SET not defined
-#endif
-
-#ifndef TMP_MAX
-#error TMP_MAX not defined
-#endif
-
-#ifndef _IOFBF
-#error _IOFBF not defined
-#endif
-
-#ifndef _IOLBF
-#error _IOLBF not defined
-#endif
-
-#ifndef _IONBF
-#error _IONBF not defined
-#endif
-
-#ifndef stderr
-#error stderr not defined
-#endif
-
-#ifndef stdin
-#error stdin not defined
-#endif
-
-#ifndef stdout
-#error stdout not defined
-#endif
-
-#include <cstdarg>
-
-TEST_CLANG_DIAGNOSTIC_IGNORED("-Wformat-zero-length")
-TEST_GCC_DIAGNOSTIC_IGNORED("-Wformat-zero-length")
-
-int main(int, char**)
-{
-    FILE* fp = 0;
-    fpos_t fpos = fpos_t();
-    size_t s = 0;
-    char* cp = 0;
-    char arr[] = {'a', 'b'};
-    va_list va;
-    ((void)fp); // Prevent unused warning
-    ((void)fpos); // Prevent unused warning
-    ((void)s); // Prevent unused warning
-    ((void)cp); // Prevent unused warning
-    ((void)arr); // Prevent unused warning
-    ((void)va); // Prevent unused warning
-    static_assert((std::is_same<decltype(remove("")), int>::value), "");
-    static_assert((std::is_same<decltype(rename("","")), int>::value), "");
-    static_assert((std::is_same<decltype(tmpfile()), FILE*>::value), "");
-    TEST_DIAGNOSTIC_PUSH
-    TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    static_assert((std::is_same<decltype(tmpnam(cp)), char*>::value), "");
-    TEST_DIAGNOSTIC_POP
-    static_assert((std::is_same<decltype(fclose(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(fflush(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(fopen("", "")), FILE*>::value), "");
-    static_assert((std::is_same<decltype(freopen("", "", fp)), FILE*>::value), "");
-    static_assert((std::is_same<decltype(setbuf(fp,cp)), void>::value), "");
-    static_assert((std::is_same<decltype(vfprintf(fp,"",va)), int>::value), "");
-    static_assert((std::is_same<decltype(fprintf(fp," ")), int>::value), "");
-    static_assert((std::is_same<decltype(fscanf(fp,"")), int>::value), "");
-    static_assert((std::is_same<decltype(printf("\n")), int>::value), "");
-    static_assert((std::is_same<decltype(scanf("\n")), int>::value), "");
-    static_assert((std::is_same<decltype(snprintf(cp,0,"p")), int>::value), "");
-    TEST_DIAGNOSTIC_PUSH
-    TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    static_assert((std::is_same<decltype(sprintf(cp," ")), int>::value), "");
-    TEST_DIAGNOSTIC_POP
-    static_assert((std::is_same<decltype(sscanf("","")), int>::value), "");
-    static_assert((std::is_same<decltype(vfprintf(fp,"",va)), int>::value), "");
-    static_assert((std::is_same<decltype(vfscanf(fp,"",va)), int>::value), "");
-    static_assert((std::is_same<decltype(vprintf(" ",va)), int>::value), "");
-    static_assert((std::is_same<decltype(vscanf("",va)), int>::value), "");
-    static_assert((std::is_same<decltype(vsnprintf(cp,0," ",va)), int>::value), "");
-    TEST_DIAGNOSTIC_PUSH
-    TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    static_assert((std::is_same<decltype(vsprintf(cp," ",va)), int>::value), "");
-    TEST_DIAGNOSTIC_POP
-    static_assert((std::is_same<decltype(vsscanf("","",va)), int>::value), "");
-    static_assert((std::is_same<decltype(fgetc(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(fgets(cp,0,fp)), char*>::value), "");
-    static_assert((std::is_same<decltype(fputc(0,fp)), int>::value), "");
-    static_assert((std::is_same<decltype(fputs("",fp)), int>::value), "");
-    static_assert((std::is_same<decltype(getc(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(getchar()), int>::value), "");
-#if TEST_STD_VER < 14
-    TEST_DIAGNOSTIC_PUSH
-    TEST_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    TEST_GCC_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
-    static_assert((std::is_same<decltype(gets(cp)), char*>::value), "");
-    TEST_DIAGNOSTIC_POP
-#endif
-    static_assert((std::is_same<decltype(putc(0,fp)), int>::value), "");
-    static_assert((std::is_same<decltype(putchar(0)), int>::value), "");
-    static_assert((std::is_same<decltype(puts("")), int>::value), "");
-    static_assert((std::is_same<decltype(ungetc(0,fp)), int>::value), "");
-    static_assert((std::is_same<decltype(fread((void*)0,0,0,fp)), size_t>::value), "");
-    static_assert((std::is_same<decltype(fwrite((const void*)arr,1,0,fp)), size_t>::value), "");
-#ifndef TEST_HAS_NO_FGETPOS_FSETPOS
-    static_assert((std::is_same<decltype(fgetpos(fp, &fpos)), int>::value), "");
-#endif
-    static_assert((std::is_same<decltype(fseek(fp, 0,0)), int>::value), "");
-#ifndef TEST_HAS_NO_FGETPOS_FSETPOS
-    static_assert((std::is_same<decltype(fsetpos(fp, &fpos)), int>::value), "");
-#endif
-    static_assert((std::is_same<decltype(ftell(fp)), long>::value), "");
-    static_assert((std::is_same<decltype(rewind(fp)), void>::value), "");
-    static_assert((std::is_same<decltype(clearerr(fp)), void>::value), "");
-    static_assert((std::is_same<decltype(feof(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(ferror(fp)), int>::value), "");
-    static_assert((std::is_same<decltype(perror("")), void>::value), "");
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.aligned_alloc.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.aligned_alloc.compile.pass.cpp
index a02a5bb..c040930 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.aligned_alloc.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.aligned_alloc.compile.pass.cpp
@@ -13,7 +13,7 @@
 
 // ::aligned_alloc is provided by the C library, but it's marked as unavailable
 // until macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // ::aligned_alloc is not implemented on Windows
 // XFAIL: target={{.+}}-windows-{{.+}}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
index 9d60f94..ee70ed0 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
@@ -69,26 +69,18 @@
 void test_abs() {
   TEST_DIAGNOSTIC_PUSH
   TEST_CLANG_DIAGNOSTIC_IGNORED("-Wabsolute-value")
-  static_assert((std::is_same<decltype(abs((float)0)), float>::value), "");
-  static_assert((std::is_same<decltype(abs((double)0)), double>::value), "");
-  static_assert(
-      (std::is_same<decltype(abs((long double)0)), long double>::value), "");
-  static_assert((std::is_same<decltype(abs((int)0)), int>::value), "");
-  static_assert((std::is_same<decltype(abs((long)0)), long>::value), "");
-  static_assert((std::is_same<decltype(abs((long long)0)), long long>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((unsigned char)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((unsigned short)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((signed char)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((short)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((unsigned char)0)), int>::value),
-                "");
-  static_assert((std::is_same<decltype(abs((char)0)), int>::value),
-                "");
+  ASSERT_SAME_TYPE(float,       decltype(abs((float)0)));
+  ASSERT_SAME_TYPE(double,      decltype(abs((double)0)));
+  ASSERT_SAME_TYPE(long double, decltype(abs((long double)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((int)0)));
+  ASSERT_SAME_TYPE(long,        decltype(abs((long)0)));
+  ASSERT_SAME_TYPE(long long,   decltype(abs((long long)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((unsigned char)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((unsigned short)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((signed char)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((short)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((unsigned char)0)));
+  ASSERT_SAME_TYPE(int,         decltype(abs((char)0)));
 
   static_assert(!has_abs<unsigned>::value, "");
   static_assert(!has_abs<unsigned long>::value, "");
@@ -100,60 +92,59 @@
   assert(abs(-1.) == 1);
 }
 
-int main(int, char**)
-{
+int main(int, char**) {
     size_t s = 0; ((void)s);
     div_t d; ((void)d);
     ldiv_t ld; ((void)ld);
     lldiv_t lld; ((void)lld);
     char** endptr = 0;
-    static_assert((std::is_same<decltype(atof("")), double>::value), "");
-    static_assert((std::is_same<decltype(atoi("")), int>::value), "");
-    static_assert((std::is_same<decltype(atol("")), long>::value), "");
-    static_assert((std::is_same<decltype(atoll("")), long long>::value), "");
-    static_assert((std::is_same<decltype(getenv("")), char*>::value), "");
-    static_assert((std::is_same<decltype(strtod("", endptr)), double>::value), "");
-    static_assert((std::is_same<decltype(strtof("", endptr)), float>::value), "");
-    static_assert((std::is_same<decltype(strtold("", endptr)), long double>::value), "");
-    static_assert((std::is_same<decltype(strtol("", endptr,0)), long>::value), "");
-    static_assert((std::is_same<decltype(strtoll("", endptr,0)), long long>::value), "");
-    static_assert((std::is_same<decltype(strtoul("", endptr,0)), unsigned long>::value), "");
-    static_assert((std::is_same<decltype(strtoull("", endptr,0)), unsigned long long>::value), "");
-    static_assert((std::is_same<decltype(rand()), int>::value), "");
-    static_assert((std::is_same<decltype(srand(0)), void>::value), "");
+    ASSERT_SAME_TYPE(double,             decltype(atof("")));
+    ASSERT_SAME_TYPE(int,                decltype(atoi("")));
+    ASSERT_SAME_TYPE(long,               decltype(atol("")));
+    ASSERT_SAME_TYPE(long long,          decltype(atoll("")));
+    ASSERT_SAME_TYPE(char*,              decltype(getenv("")));
+    ASSERT_SAME_TYPE(double,             decltype(strtod("", endptr)));
+    ASSERT_SAME_TYPE(float,              decltype(strtof("", endptr)));
+    ASSERT_SAME_TYPE(long double,        decltype(strtold("", endptr)));
+    ASSERT_SAME_TYPE(long,               decltype(strtol("", endptr,0)));
+    ASSERT_SAME_TYPE(long long,          decltype(strtoll("", endptr,0)));
+    ASSERT_SAME_TYPE(unsigned long,      decltype(strtoul("", endptr,0)));
+    ASSERT_SAME_TYPE(unsigned long long, decltype(strtoull("", endptr,0)));
+    ASSERT_SAME_TYPE(int,                decltype(rand()));
+    ASSERT_SAME_TYPE(void,               decltype(srand(0)));
 
     // aligned_alloc tested in stdlib_h.aligned_alloc.compile.pass.cpp
 
     void* pv = 0;
     void (*handler)() = 0;
     int (*comp)(void const*, void const*) = 0;
-    static_assert((std::is_same<decltype(calloc(0,0)), void*>::value), "");
-    static_assert((std::is_same<decltype(free(0)), void>::value), "");
-    static_assert((std::is_same<decltype(malloc(0)), void*>::value), "");
-    static_assert((std::is_same<decltype(realloc(0,0)), void*>::value), "");
-    static_assert((std::is_same<decltype(abort()), void>::value), "");
-    static_assert((std::is_same<decltype(atexit(handler)), int>::value), "");
-    static_assert((std::is_same<decltype(exit(0)), void>::value), "");
-    static_assert((std::is_same<decltype(_Exit(0)), void>::value), "");
-    static_assert((std::is_same<decltype(getenv("")), char*>::value), "");
-    static_assert((std::is_same<decltype(system("")), int>::value), "");
-    static_assert((std::is_same<decltype(bsearch(pv,pv,0,0,comp)), void*>::value), "");
-    static_assert((std::is_same<decltype(qsort(pv,0,0,comp)), void>::value), "");
-    static_assert((std::is_same<decltype(abs(0)), int>::value), "");
-    static_assert((std::is_same<decltype(labs((long)0)), long>::value), "");
-    static_assert((std::is_same<decltype(llabs((long long)0)), long long>::value), "");
-    static_assert((std::is_same<decltype(div(0,0)), div_t>::value), "");
-    static_assert((std::is_same<decltype(ldiv(0L,0L)), ldiv_t>::value), "");
-    static_assert((std::is_same<decltype(lldiv(0LL,0LL)), lldiv_t>::value), "");
+    ASSERT_SAME_TYPE(void*,     decltype(calloc(0,0)));
+    ASSERT_SAME_TYPE(void,      decltype(free(0)));
+    ASSERT_SAME_TYPE(void*,     decltype(malloc(0)));
+    ASSERT_SAME_TYPE(void*,     decltype(realloc(0,0)));
+    ASSERT_SAME_TYPE(void,      decltype(abort()));
+    ASSERT_SAME_TYPE(int,       decltype(atexit(handler)));
+    ASSERT_SAME_TYPE(void,      decltype(exit(0)));
+    ASSERT_SAME_TYPE(void,      decltype(_Exit(0)));
+    ASSERT_SAME_TYPE(char*,     decltype(getenv("")));
+    ASSERT_SAME_TYPE(int,       decltype(system("")));
+    ASSERT_SAME_TYPE(void*,     decltype(bsearch(pv,pv,0,0,comp)));
+    ASSERT_SAME_TYPE(void,      decltype(qsort(pv,0,0,comp)));
+    ASSERT_SAME_TYPE(int,       decltype(abs(0)));
+    ASSERT_SAME_TYPE(long,      decltype(labs((long)0)));
+    ASSERT_SAME_TYPE(long long, decltype(llabs((long long)0)));
+    ASSERT_SAME_TYPE(div_t,     decltype(div(0,0)));
+    ASSERT_SAME_TYPE(ldiv_t,    decltype(ldiv(0L,0L)));
+    ASSERT_SAME_TYPE(lldiv_t,   decltype(lldiv(0LL,0LL)));
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
     wchar_t* pw = 0;
     const wchar_t* pwc = 0;
     char* pc = 0;
-    static_assert((std::is_same<decltype(mblen("",0)), int>::value), "");
-    static_assert((std::is_same<decltype(mbtowc(pw,"",0)), int>::value), "");
-    static_assert((std::is_same<decltype(wctomb(pc,L' ')), int>::value), "");
-    static_assert((std::is_same<decltype(mbstowcs(pw,"",0)), size_t>::value), "");
-    static_assert((std::is_same<decltype(wcstombs(pc,pwc,0)), size_t>::value), "");
+    ASSERT_SAME_TYPE(int,    decltype(mblen("",0)));
+    ASSERT_SAME_TYPE(int,    decltype(mbtowc(pw,"",0)));
+    ASSERT_SAME_TYPE(int,    decltype(wctomb(pc,L' ')));
+    ASSERT_SAME_TYPE(size_t, decltype(mbstowcs(pw,"",0)));
+    ASSERT_SAME_TYPE(size_t, decltype(wcstombs(pc,pwc,0)));
 #endif
 
     test_abs();
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/string_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/string_h.pass.cpp
index 5ccccd4..697b818 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/string_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/string_h.pass.cpp
@@ -10,7 +10,6 @@
 
 #include <string.h>
 #include <cassert>
-#include <type_traits>
 
 #include "test_macros.h"
 
@@ -18,8 +17,7 @@
 #error NULL not defined
 #endif
 
-int main(int, char**)
-{
+int main(int, char**) {
     // Functions we get directly from the C library (just check the signature)
     {
         size_t s = 0;
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/tgmath_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
index 88e42fb..e29c1a7 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
@@ -10,14 +10,11 @@
 
 #include <tgmath.h>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+int main(int, char**) {
     std::complex<double> cd;
     (void)cd;
     double x = sin(1.0);
     (void)x; // to placate scan-build
 
-  return 0;
+    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.compile.pass.cpp
new file mode 100644
index 0000000..b7eb77b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.compile.pass.cpp
@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// test <time.h>
+
+#include <time.h>
+
+#include "test_macros.h"
+
+#ifndef NULL
+#error NULL not defined
+#endif
+
+#ifndef CLOCKS_PER_SEC
+#error CLOCKS_PER_SEC not defined
+#endif
+
+clock_t c = 0;
+size_t s = 0;
+time_t t = 0;
+tm tmv = {};
+char* c1 = 0;
+const char* c2 = 0;
+ASSERT_SAME_TYPE(clock_t, decltype(clock()));
+ASSERT_SAME_TYPE(double,  decltype(difftime(t, t)));
+ASSERT_SAME_TYPE(time_t,  decltype(mktime(&tmv)));
+ASSERT_SAME_TYPE(time_t,  decltype(time(&t)));
+ASSERT_SAME_TYPE(char*,   decltype(asctime(&tmv)));
+ASSERT_SAME_TYPE(char*,   decltype(ctime(&t)));
+ASSERT_SAME_TYPE(tm*,     decltype(gmtime(&t)));
+ASSERT_SAME_TYPE(tm*,     decltype(localtime(&t)));
+ASSERT_SAME_TYPE(size_t,  decltype(strftime(c1, s, c2, &tmv)));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.pass.cpp
deleted file mode 100644
index 31aff19..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/time_h.pass.cpp
+++ /dev/null
@@ -1,43 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// test <time.h>
-
-#include <time.h>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef NULL
-#error NULL not defined
-#endif
-
-#ifndef CLOCKS_PER_SEC
-#error CLOCKS_PER_SEC not defined
-#endif
-
-int main(int, char**)
-{
-    clock_t c = 0; ((void)c);
-    size_t s = 0;
-    time_t t = 0;
-    tm tmv = {};
-    static_assert((std::is_same<decltype(clock()), clock_t>::value), "");
-    static_assert((std::is_same<decltype(difftime(t,t)), double>::value), "");
-    static_assert((std::is_same<decltype(mktime(&tmv)), time_t>::value), "");
-    static_assert((std::is_same<decltype(time(&t)), time_t>::value), "");
-    static_assert((std::is_same<decltype(asctime(&tmv)), char*>::value), "");
-    static_assert((std::is_same<decltype(ctime(&t)), char*>::value), "");
-    static_assert((std::is_same<decltype(gmtime(&t)), tm*>::value), "");
-    static_assert((std::is_same<decltype(localtime(&t)), tm*>::value), "");
-    char* c1 = 0;
-    const char* c2 = 0;
-    static_assert((std::is_same<decltype(strftime(c1,s,c2,&tmv)), size_t>::value), "");
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/uchar_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/uchar_h.compile.pass.cpp
index 016e51d..2b64554 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/uchar_h.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/uchar_h.compile.pass.cpp
@@ -11,9 +11,6 @@
 // Apple platforms don't provide <uchar.h> yet, so these tests fail.
 // XFAIL: target={{.+}}-apple-{{.+}}
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // <uchar.h>
 
 #include <uchar.h>
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.compile.pass.cpp
new file mode 100644
index 0000000..ae08ebd
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.compile.pass.cpp
@@ -0,0 +1,114 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// XFAIL: no-wide-characters
+
+// <wchar.h>
+
+#include <wchar.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <type_traits>
+
+#include "test_macros.h"
+
+#ifndef NULL
+#error NULL not defined
+#endif
+
+#ifndef WCHAR_MAX
+#error WCHAR_MAX not defined
+#endif
+
+#ifndef WCHAR_MIN
+#error WCHAR_MIN not defined
+#endif
+
+#ifndef WEOF
+#error WEOF not defined
+#endif
+
+// mbstate_t comes from the underlying C library; it is defined (in C99) as:
+//    a complete object type other than an array type that can hold the conversion
+//    state information necessary to convert between sequences of multibyte
+//    characters and wide characters
+mbstate_t mb = {};
+size_t s = 0;
+tm *tm = 0;
+wint_t w = 0;
+::FILE* fp = 0;
+::va_list va;
+char* ns = 0;
+wchar_t* ws = 0;
+const wchar_t* cws = 0;
+wchar_t** wsp = 0;
+
+ASSERT_SAME_TYPE(int,                decltype(fwprintf(fp, L"")));
+ASSERT_SAME_TYPE(int,                decltype(fwscanf(fp, L"")));
+ASSERT_SAME_TYPE(int,                decltype(swprintf(ws, s, L"")));
+ASSERT_SAME_TYPE(int,                decltype(swscanf(L"", L"")));
+ASSERT_SAME_TYPE(int,                decltype(vfwprintf(fp, L"", va)));
+ASSERT_SAME_TYPE(int,                decltype(vfwscanf(fp, L"", va)));
+ASSERT_SAME_TYPE(int,                decltype(vswprintf(ws, s, L"", va)));
+ASSERT_SAME_TYPE(int,                decltype(vswscanf(L"", L"", va)));
+ASSERT_SAME_TYPE(wint_t,             decltype(fgetwc(fp)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(fgetws(ws, 0, fp)));
+ASSERT_SAME_TYPE(wint_t,             decltype(fputwc(L' ', fp)));
+ASSERT_SAME_TYPE(int,                decltype(fputws(L"", fp)));
+ASSERT_SAME_TYPE(int,                decltype(fwide(fp, 0)));
+ASSERT_SAME_TYPE(wint_t,             decltype(getwc(fp)));
+ASSERT_SAME_TYPE(wint_t,             decltype(putwc(L' ', fp)));
+ASSERT_SAME_TYPE(wint_t,             decltype(ungetwc(L' ', fp)));
+ASSERT_SAME_TYPE(double,             decltype(wcstod(L"", wsp)));
+ASSERT_SAME_TYPE(float,              decltype(wcstof(L"", wsp)));
+ASSERT_SAME_TYPE(long double,        decltype(wcstold(L"", wsp)));
+ASSERT_SAME_TYPE(long,               decltype(wcstol(L"", wsp, 0)));
+ASSERT_SAME_TYPE(long long,          decltype(wcstoll(L"", wsp, 0)));
+ASSERT_SAME_TYPE(unsigned long,      decltype(wcstoul(L"", wsp, 0)));
+ASSERT_SAME_TYPE(unsigned long long, decltype(wcstoull(L"", wsp, 0)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcscpy(ws, L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsncpy(ws, L"", s)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcscat(ws, L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsncat(ws, L"", s)));
+ASSERT_SAME_TYPE(int,                decltype(wcscmp(L"", L"")));
+ASSERT_SAME_TYPE(int,                decltype(wcscoll(L"", L"")));
+ASSERT_SAME_TYPE(int,                decltype(wcsncmp(L"", L"", s)));
+ASSERT_SAME_TYPE(size_t,             decltype(wcsxfrm(ws, L"", s)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcschr(ws, L' ')));
+ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcschr(cws, L' ')));
+ASSERT_SAME_TYPE(size_t,             decltype(wcscspn(L"", L"")));
+ASSERT_SAME_TYPE(size_t,             decltype(wcslen(L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcspbrk(ws, L"")));
+ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcspbrk(cws, L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsrchr(ws, L' ')));
+ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcsrchr(cws, L' ')));
+ASSERT_SAME_TYPE(size_t,             decltype(wcsspn(L"", L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsstr(ws, L"")));
+ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcsstr(cws, L"")));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wcstok(ws, L"", wsp)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemchr(ws, L' ', s)));
+ASSERT_SAME_TYPE(const wchar_t*,     decltype(wmemchr(cws, L' ', s)));
+ASSERT_SAME_TYPE(int,                decltype(wmemcmp(L"", L"", s)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemcpy(ws, L"", s)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemmove(ws, L"", s)));
+ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemset(ws, L' ', s)));
+ASSERT_SAME_TYPE(size_t,             decltype(wcsftime(ws, s, L"", tm)));
+ASSERT_SAME_TYPE(wint_t,             decltype(btowc(0)));
+ASSERT_SAME_TYPE(int,                decltype(wctob(w)));
+ASSERT_SAME_TYPE(int,                decltype(mbsinit(&mb)));
+ASSERT_SAME_TYPE(size_t,             decltype(mbrlen("", s, &mb)));
+ASSERT_SAME_TYPE(size_t,             decltype(mbrtowc(ws, "", s, &mb)));
+ASSERT_SAME_TYPE(size_t,             decltype(wcrtomb(ns, L' ', &mb)));
+ASSERT_SAME_TYPE(size_t,             decltype(mbsrtowcs(ws, (const char**)0, s, &mb)));
+ASSERT_SAME_TYPE(size_t,             decltype(wcsrtombs(ns, (const wchar_t**)0, s, &mb)));
+ASSERT_SAME_TYPE(wint_t,             decltype(getwchar()));
+ASSERT_SAME_TYPE(int,                decltype(vwscanf(L"", va)));
+ASSERT_SAME_TYPE(int,                decltype(wscanf(L"")));
+ASSERT_SAME_TYPE(wint_t,             decltype(putwchar(L' ')));
+ASSERT_SAME_TYPE(int,                decltype(vwprintf(L"", va)));
+ASSERT_SAME_TYPE(int,                decltype(wprintf(L"")));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp
deleted file mode 100644
index 78716da..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp
+++ /dev/null
@@ -1,128 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// XFAIL: no-wide-characters
-
-// <wchar.h>
-
-#include <wchar.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef NULL
-#error NULL not defined
-#endif
-
-#ifndef WCHAR_MAX
-#error WCHAR_MAX not defined
-#endif
-
-#ifndef WCHAR_MIN
-#error WCHAR_MIN not defined
-#endif
-
-#ifndef WEOF
-#error WEOF not defined
-#endif
-
-int main(int, char**)
-{
-// mbstate_t comes from the underlying C library; it is defined (in C99) as:
-//    a complete object type other than an array type that can hold the conversion
-//    state information necessary to convert between sequences of multibyte
-//    characters and wide characters
-    mbstate_t mb = {};
-    size_t s = 0;
-    tm *tm = 0;
-    wint_t w = 0;
-    ::FILE* fp = 0;
-    ::va_list va;
-    char* ns = 0;
-    wchar_t* ws = 0;
-    const wchar_t* cws = 0;
-    wchar_t** wsp = 0;
-    ((void)mb); // Prevent unused warning
-    ((void)s); // Prevent unused warning
-    ((void)tm); // Prevent unused warning
-    ((void)w); // Prevent unused warning
-    ((void)fp); // Prevent unused warning
-    ((void)va); // Prevent unused warning
-    ((void)ns); // Prevent unused warning
-    ((void)ws); // Prevent unused warning
-    ((void)cws); // Prevent unused warning
-    ((void)wsp); // Prevent unused warning
-    ASSERT_SAME_TYPE(int,                decltype(fwprintf(fp, L"")));
-    ASSERT_SAME_TYPE(int,                decltype(fwscanf(fp, L"")));
-    ASSERT_SAME_TYPE(int,                decltype(swprintf(ws, s, L"")));
-    ASSERT_SAME_TYPE(int,                decltype(swscanf(L"", L"")));
-    ASSERT_SAME_TYPE(int,                decltype(vfwprintf(fp, L"", va)));
-    ASSERT_SAME_TYPE(int,                decltype(vfwscanf(fp, L"", va)));
-    ASSERT_SAME_TYPE(int,                decltype(vswprintf(ws, s, L"", va)));
-    ASSERT_SAME_TYPE(int,                decltype(vswscanf(L"", L"", va)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(fgetwc(fp)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(fgetws(ws, 0, fp)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(fputwc(L' ', fp)));
-    ASSERT_SAME_TYPE(int,                decltype(fputws(L"", fp)));
-    ASSERT_SAME_TYPE(int,                decltype(fwide(fp, 0)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(getwc(fp)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(putwc(L' ', fp)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(ungetwc(L' ', fp)));
-    ASSERT_SAME_TYPE(double,             decltype(wcstod(L"", wsp)));
-    ASSERT_SAME_TYPE(float,              decltype(wcstof(L"", wsp)));
-    ASSERT_SAME_TYPE(long double,        decltype(wcstold(L"", wsp)));
-    ASSERT_SAME_TYPE(long,               decltype(wcstol(L"", wsp, 0)));
-    ASSERT_SAME_TYPE(long long,          decltype(wcstoll(L"", wsp, 0)));
-    ASSERT_SAME_TYPE(unsigned long,      decltype(wcstoul(L"", wsp, 0)));
-    ASSERT_SAME_TYPE(unsigned long long, decltype(wcstoull(L"", wsp, 0)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcscpy(ws, L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsncpy(ws, L"", s)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcscat(ws, L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsncat(ws, L"", s)));
-    ASSERT_SAME_TYPE(int,                decltype(wcscmp(L"", L"")));
-    ASSERT_SAME_TYPE(int,                decltype(wcscoll(L"", L"")));
-    ASSERT_SAME_TYPE(int,                decltype(wcsncmp(L"", L"", s)));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcsxfrm(ws, L"", s)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcschr(ws, L' ')));
-    ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcschr(cws, L' ')));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcscspn(L"", L"")));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcslen(L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcspbrk(ws, L"")));
-    ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcspbrk(cws, L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsrchr(ws, L' ')));
-    ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcsrchr(cws, L' ')));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcsspn(L"", L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcsstr(ws, L"")));
-    ASSERT_SAME_TYPE(const wchar_t*,     decltype(wcsstr(cws, L"")));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wcstok(ws, L"", wsp)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemchr(ws, L' ', s)));
-    ASSERT_SAME_TYPE(const wchar_t*,     decltype(wmemchr(cws, L' ', s)));
-    ASSERT_SAME_TYPE(int,                decltype(wmemcmp(L"", L"", s)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemcpy(ws, L"", s)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemmove(ws, L"", s)));
-    ASSERT_SAME_TYPE(wchar_t*,           decltype(wmemset(ws, L' ', s)));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcsftime(ws, s, L"", tm)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(btowc(0)));
-    ASSERT_SAME_TYPE(int,                decltype(wctob(w)));
-    ASSERT_SAME_TYPE(int,                decltype(mbsinit(&mb)));
-    ASSERT_SAME_TYPE(size_t,             decltype(mbrlen("", s, &mb)));
-    ASSERT_SAME_TYPE(size_t,             decltype(mbrtowc(ws, "", s, &mb)));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcrtomb(ns, L' ', &mb)));
-    ASSERT_SAME_TYPE(size_t,             decltype(mbsrtowcs(ws, (const char**)0, s, &mb)));
-    ASSERT_SAME_TYPE(size_t,             decltype(wcsrtombs(ns, (const wchar_t**)0, s, &mb)));
-    ASSERT_SAME_TYPE(wint_t,             decltype(getwchar()));
-    ASSERT_SAME_TYPE(int,                decltype(vwscanf(L"", va)));
-    ASSERT_SAME_TYPE(int,                decltype(wscanf(L"")));
-    ASSERT_SAME_TYPE(wint_t,             decltype(putwchar(L' ')));
-    ASSERT_SAME_TYPE(int,                decltype(vwprintf(L"", va)));
-    ASSERT_SAME_TYPE(int,                decltype(wprintf(L"")));
-
-    return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.compile.pass.cpp
new file mode 100644
index 0000000..094f771
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.compile.pass.cpp
@@ -0,0 +1,113 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// XFAIL: no-wide-characters
+
+// <wctype.h>
+
+#include <wctype.h>
+
+#include "test_macros.h"
+
+#ifndef WEOF
+#error WEOF not defined
+#endif
+
+#ifdef iswalnum
+#error iswalnum defined
+#endif
+
+#ifdef iswalpha
+#error iswalpha defined
+#endif
+
+#ifdef iswblank
+#error iswblank defined
+#endif
+
+#ifdef iswcntrl
+#error iswcntrl defined
+#endif
+
+#ifdef iswdigit
+#error iswdigit defined
+#endif
+
+#ifdef iswgraph
+#error iswgraph defined
+#endif
+
+#ifdef iswlower
+#error iswlower defined
+#endif
+
+#ifdef iswprint
+#error iswprint defined
+#endif
+
+#ifdef iswpunct
+#error iswpunct defined
+#endif
+
+#ifdef iswspace
+#error iswspace defined
+#endif
+
+#ifdef iswupper
+#error iswupper defined
+#endif
+
+#ifdef iswxdigit
+#error iswxdigit defined
+#endif
+
+#ifdef iswctype
+#error iswctype defined
+#endif
+
+#ifdef wctype
+#error wctype defined
+#endif
+
+#ifdef towlower
+#error towlower defined
+#endif
+
+#ifdef towupper
+#error towupper defined
+#endif
+
+#ifdef towctrans
+#error towctrans defined
+#endif
+
+#ifdef wctrans
+#error wctrans defined
+#endif
+
+wint_t w = 0;
+wctrans_t wctr = 0;
+wctype_t wct = 0;
+ASSERT_SAME_TYPE(int,       decltype(iswalnum(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswalpha(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswblank(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswcntrl(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswdigit(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswgraph(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswlower(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswprint(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswpunct(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswspace(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswupper(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswxdigit(w)));
+ASSERT_SAME_TYPE(int,       decltype(iswctype(w, wct)));
+ASSERT_SAME_TYPE(wctype_t,  decltype(wctype("")));
+ASSERT_SAME_TYPE(wint_t,    decltype(towlower(w)));
+ASSERT_SAME_TYPE(wint_t,    decltype(towupper(w)));
+ASSERT_SAME_TYPE(wint_t,    decltype(towctrans(w, wctr)));
+ASSERT_SAME_TYPE(wctrans_t, decltype(wctrans("")));
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.pass.cpp
deleted file mode 100644
index c40623a..0000000
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/wctype_h.pass.cpp
+++ /dev/null
@@ -1,119 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// XFAIL: no-wide-characters
-
-// <wctype.h>
-
-#include <wctype.h>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#ifndef WEOF
-#error WEOF not defined
-#endif
-
-#ifdef iswalnum
-#error iswalnum defined
-#endif
-
-#ifdef iswalpha
-#error iswalpha defined
-#endif
-
-#ifdef iswblank
-#error iswblank defined
-#endif
-
-#ifdef iswcntrl
-#error iswcntrl defined
-#endif
-
-#ifdef iswdigit
-#error iswdigit defined
-#endif
-
-#ifdef iswgraph
-#error iswgraph defined
-#endif
-
-#ifdef iswlower
-#error iswlower defined
-#endif
-
-#ifdef iswprint
-#error iswprint defined
-#endif
-
-#ifdef iswpunct
-#error iswpunct defined
-#endif
-
-#ifdef iswspace
-#error iswspace defined
-#endif
-
-#ifdef iswupper
-#error iswupper defined
-#endif
-
-#ifdef iswxdigit
-#error iswxdigit defined
-#endif
-
-#ifdef iswctype
-#error iswctype defined
-#endif
-
-#ifdef wctype
-#error wctype defined
-#endif
-
-#ifdef towlower
-#error towlower defined
-#endif
-
-#ifdef towupper
-#error towupper defined
-#endif
-
-#ifdef towctrans
-#error towctrans defined
-#endif
-
-#ifdef wctrans
-#error wctrans defined
-#endif
-
-int main(int, char**)
-{
-    wint_t w = 0;
-    wctrans_t wctr = 0;
-    wctype_t wct = 0;
-    static_assert((std::is_same<decltype(iswalnum(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswalpha(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswblank(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswcntrl(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswdigit(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswgraph(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswlower(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswprint(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswpunct(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswspace(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswupper(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswxdigit(w)), int>::value), "");
-    static_assert((std::is_same<decltype(iswctype(w, wct)), int>::value), "");
-    static_assert((std::is_same<decltype(wctype("")), wctype_t>::value), "");
-    static_assert((std::is_same<decltype(towlower(w)), wint_t>::value), "");
-    static_assert((std::is_same<decltype(towupper(w)), wint_t>::value), "");
-    static_assert((std::is_same<decltype(towctrans(w, wctr)), wint_t>::value), "");
-    static_assert((std::is_same<decltype(wctrans("")), wctrans_t>::value), "");
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
index 93cfbb6..00ae309 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
@@ -16,11 +16,7 @@
 #include <functional>
 
 #include "../test_func.h"
-#include "test_macros.h"
 
-int main(int, char**)
-{
+void f() {
     std::bind1st(test_func(1), 5); // expected-warning {{'bind1st<test_func, int>' is deprecated}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
index 3e55db6..c1c78ec 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
@@ -16,11 +16,7 @@
 #include <functional>
 
 #include "../test_func.h"
-#include "test_macros.h"
 
-int main(int, char**)
-{
+void f() {
     std::bind2nd(test_func(1), 5); // expected-warning {{'bind2nd<test_func, int>' is deprecated}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
index 5048d7b..c1b7c68 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
@@ -16,11 +16,5 @@
 #include <functional>
 
 #include "../test_func.h"
-#include "test_macros.h"
 
-int main(int, char**)
-{
-    typedef std::binder1st<test_func> B1ST; // expected-warning {{'binder1st<test_func>' is deprecated}}
-
-    return 0;
-}
+typedef std::binder1st<test_func> B1ST; // expected-warning {{'binder1st<test_func>' is deprecated}}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
index 5a883ab..fa25fa0 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
@@ -16,11 +16,5 @@
 #include <functional>
 
 #include "../test_func.h"
-#include "test_macros.h"
 
-int main(int, char**)
-{
-    typedef std::binder2nd<test_func> B2ND; // expected-warning {{'binder2nd<test_func>' is deprecated}}
-
-    return 0;
-}
+typedef std::binder2nd<test_func> B2ND; // expected-warning {{'binder2nd<test_func>' is deprecated}}
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp b/third_party/llvm-project/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
index 025bc0b..83e3009 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
@@ -34,7 +34,7 @@
 struct test
     : std::strstreambuf
 {
-    test(void* (*palloc_arg)(size_t), void (*pfree_arg)(void*))
+    test(void* (*palloc_arg)(std::size_t), void (*pfree_arg)(void*))
         : std::strstreambuf(palloc_arg, pfree_arg) {}
     virtual int_type overflow(int_type c)
         {return std::strstreambuf::overflow(c);}
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/errc.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/errc.pass.cpp
index 6a04a3c..e44cb50 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/errc.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/errc.pass.cpp
@@ -10,6 +10,7 @@
 
 // enum errc {...}
 
+#include <cerrno>
 #include <system_error>
 
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
index 2f766e6..b4a6566 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
@@ -12,6 +12,7 @@
 
 // template <class T> constexpr bool is_error_condition_enum_v;
 
+#include <string>
 #include <system_error>
 #include <type_traits>
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
index 4570d57..84f209c 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // XFAIL: suse-linux-enterprise-server-11
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // <system_error>
 
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
index 415a900..7b15da3 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
@@ -13,7 +13,7 @@
 // const error_category& system_category();
 
 // XFAIL: suse-linux-enterprise-server-11
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 #include <system_error>
 #include <cassert>
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
index bfd6fd6..0559778 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <system_error>
 #include <cassert>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
index 0f5aa8b..2c98c89 100644
--- a/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <system_error>
 #include <cassert>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/algorithms/alg.search/search.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/algorithms/alg.search/search.pass.cpp
deleted file mode 100644
index 8751bc1..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/algorithms/alg.search/search.pass.cpp
+++ /dev/null
@@ -1,48 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <algorithm>
-
-//   template<class ForwardIterator, class Searcher>
-//   ForwardIterator search(ForwardIterator first, ForwardIterator last,
-//                          const Searcher& searcher);
-//
-//      returns searcher.operator(first, last).first
-//
-
-#include <experimental/algorithm>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-int searcher_called = 0;
-
-struct MySearcher {
-    template <typename Iterator>
-    std::pair<Iterator, Iterator>
-    operator() (Iterator b, Iterator e) const
-    {
-        ++searcher_called;
-        return std::make_pair(b, e);
-    }
-};
-
-
-int main(int, char**) {
-    typedef int * RI;
-    static_assert((std::is_same<RI, decltype(std::experimental::search(RI(), RI(), MySearcher()))>::value), "" );
-
-    RI it(nullptr);
-    assert(it == std::experimental::search(it, it, MySearcher()));
-    assert(searcher_called == 1);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp
deleted file mode 100644
index d5acb8f..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_searcher {
-// public:
-//   boyer_moore_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-#include <string>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result) {
-    std::experimental::boyer_moore_searcher<Iter2> s{b2, e2};
-    assert(result == std::experimental::search(b1, e1, s));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    int ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    int ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    char ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    char ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-template <class Iter1, class Iter2>
-void test_large_str() {
-    std::vector<signed char> data(257, 'a');
-    data[254] = 'b';
-    data[255] = 'b';
-    data[256] = 'b';
-    const signed char find[] = {'b', 'b', 'b'};
-    do_search(Iter1(data.data()), Iter1(data.data() + data.size()),
-              Iter2(find), Iter2(find + 3),
-              Iter1(data.data() + 254));
-}
-
-void test_custom_pred() {
-    std::string long_string(1024, '0');
-    auto searcher = std::experimental::make_boyer_moore_searcher(std::begin(long_string), std::end(long_string));
-    const char str[] = "1234";
-    auto ret = searcher(std::begin(str), std::end(str));
-    assert(ret.first == std::end(str));
-    assert(ret.second == std::end(str));
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-    test_large_str<random_access_iterator<const signed char*>, random_access_iterator<const signed char*>>();
-    test_custom_pred();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp
deleted file mode 100644
index 5933b61..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp
+++ /dev/null
@@ -1,127 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_searcher {
-// public:
-//   boyer_moore_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
-};
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned /*max_count*/) {
-    std::experimental::boyer_moore_searcher<Iter2,
-                 MyHash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>>
-          s{b2, e2};
-    assert(result == std::experimental::search(b1, e1, s));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp
deleted file mode 100644
index ef3315f..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp
+++ /dev/null
@@ -1,145 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_searcher {
-// public:
-//   boyer_moore_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
-};
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y) const
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    std::experimental::boyer_moore_searcher<Iter2,
-                 MyHash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>,
-                 count_equal>
-          s{b2, e2};
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1, s));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),     sa);
-
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp
deleted file mode 100644
index 86aa18e..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp
+++ /dev/null
@@ -1,136 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_searcher {
-// public:
-//   boyer_moore_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                        Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y) const
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    std::experimental::boyer_moore_searcher<Iter2,
-           typename std::hash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>, count_equal> s{b2, e2};
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1, s));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp
deleted file mode 100644
index 440bc05..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp
+++ /dev/null
@@ -1,131 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore_horspool searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_horspool_searcher {
-// public:
-//   boyer_moore_horspool_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                                 Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result) {
-    std::experimental::boyer_moore_horspool_searcher<Iter2> s{b2, e2};
-    assert(result == std::experimental::search(b1, e1, s));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    int ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    int ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    char ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    char ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp
deleted file mode 100644
index 4677c3a..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp
+++ /dev/null
@@ -1,126 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore_horspool searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_horspool_searcher {
-// public:
-//   boyer_moore_horspool_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                                 Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
-};
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned /*max_count*/) {
-    std::experimental::boyer_moore_horspool_searcher<Iter2,
-                 MyHash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>>
-          s{b2, e2};
-    assert(result == std::experimental::search(b1, e1, s));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp
deleted file mode 100644
index 2191ad1..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp
+++ /dev/null
@@ -1,139 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore_horspool searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_horspool_searcher {
-// public:
-//   boyer_moore_horspool_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                                 Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
-};
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y) const
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    std::experimental::boyer_moore_horspool_searcher<Iter2,
-                 MyHash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>,
-                 count_equal>
-          s{b2, e2};
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1, s));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp
deleted file mode 100644
index b97f52b..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp
+++ /dev/null
@@ -1,133 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// boyer_moore_horspool searcher
-// template<class RandomAccessIterator1,
-//          class Hash = hash<typename iterator_traits<RandomAccessIterator1>::value_type>,
-//          class BinaryPredicate = equal_to<>>
-// class boyer_moore_horspool_searcher {
-// public:
-//   boyer_moore_horspool_searcher(RandomAccessIterator1 pat_first, RandomAccessIterator1 pat_last,
-//                                 Hash hf = Hash(), BinaryPredicate pred = BinaryPredicate());
-//
-//   template<class RandomAccessIterator2>
-//   pair<RandomAccessIterator2, RandomAccessIterator2>
-//   operator()(RandomAccessIterator2 first, RandomAccessIterator2 last) const;
-//
-// private:
-//   RandomAccessIterator1 pat_first_; // exposition only
-//   RandomAccessIterator1 pat_last_;  // exposition only
-//   Hash                  hash_;      // exposition only
-//   BinaryPredicate       pred_;      // exposition only
-// };
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y) const
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    std::experimental::boyer_moore_horspool_searcher<Iter2,
-           typename std::hash<typename std::remove_cv<typename std::iterator_traits<Iter2>::value_type>::type>, count_equal> s{b2, e2};
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1, s));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-template <class Iter1, class Iter2>
-void
-test2()
-{
-    char ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    char ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    char ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    char id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    char ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    char ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    char ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    char ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-    test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp
deleted file mode 100644
index 99cc8c3..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp
+++ /dev/null
@@ -1,99 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// default searcher
-// template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
-// class default_searcher {
-// public:
-//     default_searcher(_ForwardIterator __f, _ForwardIterator __l,
-//                             _BinaryPredicate __p = _BinaryPredicate())
-//         : __first_(__f), __last_(__l), __pred_(__p) {}
-//
-//     template <typename _ForwardIterator2>
-//     pair<_ForwardIterator2, _ForwardIterator2>
-//     operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const {
-//         return std::search(__f, __l, __first_, __last_, __pred_);
-//         }
-//
-// private:
-//     _ForwardIterator __first_;
-//     _ForwardIterator __last_;
-//     _BinaryPredicate __pred_;
-//     };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result) {
-    std::experimental::default_searcher<Iter2> s{b2, e2};
-    assert(result == std::experimental::search(b1, e1, s));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    int ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    int ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-int main(int, char**) {
-    test<forward_iterator<const int*>, forward_iterator<const int*> >();
-    test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<forward_iterator<const int*>, random_access_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
-    test<random_access_iterator<const int*>, forward_iterator<const int*> >();
-    test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp
deleted file mode 100644
index 5901dfb..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp
+++ /dev/null
@@ -1,106 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <functional>
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// default searcher
-// template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
-// class default_searcher {
-// public:
-//     default_searcher(_ForwardIterator __f, _ForwardIterator __l,
-//                             _BinaryPredicate __p = _BinaryPredicate())
-//         : __first_(__f), __last_(__l), __pred_(__p) {}
-//
-//     template <typename _ForwardIterator2>
-//     pair<_ForwardIterator2, _ForwardIterator2>
-//     operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const {
-//         return std::search(__f, __l, __first_, __last_, __pred_);
-//         }
-//
-// private:
-//     _ForwardIterator __first_;
-//     _ForwardIterator __last_;
-//     _BinaryPredicate __pred_;
-//     };
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y) const
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    std::experimental::default_searcher<Iter2, count_equal> s{b2, e2};
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1, s));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<forward_iterator<const int*>, forward_iterator<const int*> >();
-    test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<forward_iterator<const int*>, random_access_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
-    test<random_access_iterator<const int*>, forward_iterator<const int*> >();
-    test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp
deleted file mode 100644
index f5ec9ff..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp
+++ /dev/null
@@ -1,84 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// template<class ForwardIterator, class BinaryPredicate = equal_to<>>
-// default_searcher<ForwardIterator, BinaryPredicate>
-// make_default_searcher(ForwardIterator pat_first, ForwardIterator pat_last,
-//                       BinaryPredicate pred = BinaryPredicate());
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result) {
-    assert(result == std::experimental::search(b1, e1,
-        std::experimental::make_default_searcher(b2, e2)));
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),     Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2));
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia));
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1));
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1));
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
-    int ij[] = {0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sj = sizeof(ij)/sizeof(ij[0]);
-    int ik[] = {0, 0, 0, 0, 1, 1, 1, 1, 0, 0};
-    const unsigned sk = sizeof(ik)/sizeof(ik[0]);
-    do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
-}
-
-int main(int, char**) {
-    test<forward_iterator<const int*>, forward_iterator<const int*> >();
-    test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<forward_iterator<const int*>, random_access_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
-    test<random_access_iterator<const int*>, forward_iterator<const int*> >();
-    test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp
deleted file mode 100644
index 196d028..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_SEARCHERS
-
-// <functional>
-
-// template<class ForwardIterator, class BinaryPredicate = equal_to<>>
-// default_searcher<ForwardIterator, BinaryPredicate>
-// make_default_searcher(ForwardIterator pat_first, ForwardIterator pat_last,
-//                       BinaryPredicate pred = BinaryPredicate());
-
-
-#include <experimental/algorithm>
-#include <experimental/functional>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-
-struct count_equal
-{
-    static unsigned count;
-    template <class T>
-    bool operator()(const T& x, const T& y)
-        {++count; return x == y;}
-};
-
-unsigned count_equal::count = 0;
-
-template <typename Iter1, typename Iter2>
-void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result, unsigned max_count) {
-    count_equal::count = 0;
-    assert(result == std::experimental::search(b1, e1,
-        std::experimental::make_default_searcher(b2, e2)));
-    assert(count_equal::count <= max_count);
-}
-
-template <class Iter1, class Iter2>
-void
-test()
-{
-    int ia[] = {0, 1, 2, 3, 4, 5};
-    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia),    Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+1),  Iter1(ia),      sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+1),    Iter2(ia+2),  Iter1(ia+1),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+2),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+2),    Iter2(ia+3),  Iter1(ia+2),    sa);
-    do_search(Iter1(ia), Iter1(ia),      Iter2(ia+2),    Iter2(ia+3),  Iter1(ia),      0);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1), sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3), 3*sa);
-    do_search(Iter1(ia), Iter1(ia+sa),   Iter2(ia),      Iter2(ia+sa), Iter1(ia),      sa*sa);
-    do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia),      Iter2(ia+sa), Iter1(ia+sa-1), (sa-1)*sa);
-    do_search(Iter1(ia), Iter1(ia+1),    Iter2(ia),      Iter2(ia+sa), Iter1(ia+1),    sa);
-    int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
-    int ic[] = {1};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1), sb);
-    int id[] = {1, 2};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1), sb*2);
-    int ie[] = {1, 2, 3};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4), sb*3);
-    int ig[] = {1, 2, 3, 4};
-    do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8), sb*4);
-    int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
-    const unsigned sh = sizeof(ih)/sizeof(ih[0]);
-    int ii[] = {1, 1, 2};
-    do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
-}
-
-int main(int, char**) {
-    test<forward_iterator<const int*>, forward_iterator<const int*> >();
-    test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<forward_iterator<const int*>, random_access_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
-    test<random_access_iterator<const int*>, forward_iterator<const int*> >();
-    test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
-    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/func/header.functional.synop/includes.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/func/header.functional.synop/includes.pass.cpp
deleted file mode 100644
index 040f2bd..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/func/header.functional.synop/includes.pass.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/functional>
-//
-//  has to include <functional>
-
-#include <experimental/functional>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-  std::function<int(int)> x;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp
deleted file mode 100644
index 94b94d8..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp
+++ /dev/null
@@ -1,58 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// constexpr explicit operator bool() const noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test() {
-  static_assert(std::is_nothrow_constructible<bool, C>::value, "");
-  static_assert(!std::is_convertible<C, bool>::value, "");
-  {
-    constexpr C c; ((void)c);
-    static_assert(bool(c) == false, "");
-  }
-  { // null case
-    const C c = {}; ((void)c);
-    ASSERT_NOEXCEPT(bool(c));
-    if (c)
-      assert(false);
-    else
-      assert(true);
-    assert(c.address() == nullptr);
-    assert(bool(c) == false);
-  }
-  { // non-null case
-    char dummy = 42;
-    C c = C::from_address((void*)&dummy);
-    assert(c.address() == &dummy);
-    assert(bool(c) == true);
-  }
-}
-
-int main(int, char**)
-{
-  do_test<coro::coroutine_handle<>>();
-  do_test<coro::coroutine_handle<int>>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp
deleted file mode 100644
index e8757ea..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp
+++ /dev/null
@@ -1,60 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// bool operator==(coroutine_handle<>, coroutine_handle<>) noexcept
-// bool operator!=(coroutine_handle<>, coroutine_handle<>) noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
-  const C LHS = C::from_address(reinterpret_cast<void*>(LHSVal));
-  const C RHS = C::from_address(reinterpret_cast<void*>(RHSVal));
-  const bool ExpectIsEqual = (LHSVal == RHSVal);
-  assert((LHS == RHS) == ExpectIsEqual);
-  assert((RHS == LHS) == ExpectIsEqual);
-  assert((LHS != RHS) == !ExpectIsEqual);
-  assert((RHS != LHS) == !ExpectIsEqual);
-  {
-    static_assert(noexcept(LHS == RHS), "");
-    static_assert(noexcept(LHS != RHS), "");
-    ASSERT_SAME_TYPE(decltype(LHS == RHS), bool);
-    ASSERT_SAME_TYPE(decltype(LHS != RHS), bool);
-  }
-}
-
-int main(int, char**)
-{
-  std::pair<uintptr_t, uintptr_t> const TestCases[] = {
-      {0, 0},
-      {16, 16},
-      {0, 16},
-      {16, 0}
-  };
-  for (auto& TC : TestCases) {
-    do_test<coro::coroutine_handle<>>(TC.first, TC.second);
-    do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp
deleted file mode 100644
index ce1d06c..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp
+++ /dev/null
@@ -1,69 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// bool operator<(coroutine_handle<>, coroutine_handle<>) noexcept
-// bool operator>(coroutine_handle<>, coroutine_handle<>) noexcept
-// bool operator>=(coroutine_handle<>, coroutine_handle<>) noexcept
-// bool operator<=(coroutine_handle<>, coroutine_handle<>) noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
-  const C LHS = C::from_address(reinterpret_cast<void*>(LHSVal));
-  const C RHS = C::from_address(reinterpret_cast<void*>(RHSVal));
-  assert((LHS < RHS) == (LHSVal < RHSVal));
-  assert((RHS < LHS) == (RHSVal < LHSVal));
-  assert((LHS > RHS) == (LHSVal > RHSVal));
-  assert((RHS > LHS) == (RHSVal > LHSVal));
-  assert((LHS <= RHS) == (LHSVal <= RHSVal));
-  assert((RHS <= LHS) == (RHSVal <= LHSVal));
-  assert((LHS >= RHS) == (LHSVal >= RHSVal));
-  assert((RHS >= LHS) == (RHSVal >= LHSVal));
-  {
-    static_assert(noexcept(LHS < RHS), "");
-    static_assert(noexcept(LHS > RHS), "");
-    static_assert(noexcept(LHS <= RHS), "");
-    static_assert(noexcept(LHS >= RHS), "");
-    ASSERT_SAME_TYPE(decltype(LHS < RHS), bool);
-    ASSERT_SAME_TYPE(decltype(LHS > RHS), bool);
-    ASSERT_SAME_TYPE(decltype(LHS <= RHS), bool);
-    ASSERT_SAME_TYPE(decltype(LHS >= RHS), bool);
-  }
-}
-
-int main(int, char**)
-{
-  std::pair<uintptr_t, uintptr_t> const TestCases[] = {
-      {0, 0},
-      {16, 16},
-      {0, 16},
-      {16, 0}
-  };
-  for (auto& TC : TestCases) {
-    do_test<coro::coroutine_handle<>>(TC.first, TC.second);
-    do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp
deleted file mode 100644
index ecb34ec..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// bool done() const
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <memory>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class Promise>
-void do_test(coro::coroutine_handle<Promise> const& H) {
-  // FIXME Add a runtime test
-  {
-    ASSERT_SAME_TYPE(decltype(H.done()), bool);
-    LIBCPP_ASSERT_NOT_NOEXCEPT(H.done());
-  }
-}
-
-int main(int, char**)
-{
-  do_test(coro::coroutine_handle<>{});
-  do_test(coro::coroutine_handle<int>{});
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp
deleted file mode 100644
index c0f5bb5..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp
+++ /dev/null
@@ -1,56 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// coroutine_handle& operator=(nullptr_t) noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test() {
-  int dummy = 42;
-  void* dummy_h = &dummy;
-  {
-    C c; ((void)c);
-    static_assert(std::is_nothrow_assignable<C&, std::nullptr_t>::value, "");
-    static_assert(!std::is_assignable<C&, void*>::value, "");
-  }
-  {
-    C c = C::from_address(dummy_h);
-    assert(c.address() == &dummy);
-    c = nullptr;
-    assert(c.address() == nullptr);
-    c = nullptr;
-    assert(c.address() == nullptr);
-  }
-  {
-    C c;
-    C& cr = (c = nullptr);
-    assert(&c == &cr);
-  }
-}
-
-int main(int, char**)
-{
-  do_test<coro::coroutine_handle<>>();
-  do_test<coro::coroutine_handle<int>>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp
deleted file mode 100644
index b525d79..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp
+++ /dev/null
@@ -1,55 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// constexpr coroutine_handle() noexcept
-// constexpr coroutine_handle(nullptr_t) noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test() {
-  {
-    constexpr C c;
-    static_assert(std::is_nothrow_default_constructible<C>::value, "");
-    static_assert(c.address() == nullptr, "");
-  }
-  {
-    constexpr C c(nullptr);
-    static_assert(std::is_nothrow_constructible<C, std::nullptr_t>::value, "");
-    static_assert(c.address() == nullptr, "");
-  }
-  {
-    C c;
-    assert(c.address() == nullptr);
-  }
-  {
-    C c(nullptr);
-    assert(c.address() == nullptr);
-  }
-}
-
-int main(int, char**)
-{
-  do_test<coro::coroutine_handle<>>();
-  do_test<coro::coroutine_handle<int>>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp
deleted file mode 100644
index 08dafd4..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp
+++ /dev/null
@@ -1,51 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// constexpr void* address() const noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test() {
-  {
-    constexpr C c; ((void)c);
-    static_assert(c.address() == nullptr, "");
-  }
-  {
-    const C c = {}; ((void)c);
-    ASSERT_NOEXCEPT(c.address());
-    ASSERT_SAME_TYPE(decltype(c.address()), void*);
-    assert(c.address() == nullptr);
-  }
-  {
-    char dummy = 42;
-    C c = C::from_address((void*)&dummy);
-    assert(c.address() == &dummy);
-  }
-}
-
-int main(int, char**)
-{
-  do_test<coro::coroutine_handle<>>();
-  do_test<coro::coroutine_handle<int>>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp
deleted file mode 100644
index d02ae2f..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp
+++ /dev/null
@@ -1,46 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// static coroutine_handle from_address(void*) noexcept
-
-// Test that `from_address` is explicitly ill-formed when called with a typed
-// pointer. The user cannot possibly have a typed pointer to the coroutine.
-// FIXME: This behavior is an extension, and should upstreamed into the TS or
-// the test removed if the TS changes are rejected.
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-namespace coro = std::experimental;
-
-int main(int, char**)
-{
-  {
-    using H = coro::coroutine_handle<>;
-    // expected-error@experimental/coroutine:* 3 {{coroutine_handle<void>::from_address cannot be called with non-void pointers}}
-    H::from_address((int*)nullptr); // expected-note {{requested here}}
-    H::from_address((const void*)nullptr); // expected-note {{requested here}}
-    H::from_address((const char*)nullptr); // expected-note {{requested here}}
-  }
-  {
-    using H = coro::coroutine_handle<int>;
-    // expected-error-re@experimental/coroutine:* 1 {{{{(static_assert|static assertion)}} failed{{.*}}coroutine_handle<promise_type>::from_address cannot be used with pointers to the coroutine's promise type; use 'from_promise' instead}}
-    H::from_address((const char*)nullptr); // expected-note {{requested here}}
-    // expected-error@experimental/coroutine:* 1 {{coroutine_handle<promise_type>::from_address cannot be called with non-void pointers}}
-    H::from_address((int*)nullptr); // expected-note {{requested here}}
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp
deleted file mode 100644
index 75052af..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp
+++ /dev/null
@@ -1,48 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// static coroutine_handle from_address(void*) noexcept
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test() {
-  {
-    C c = C::from_address(nullptr);
-    static_assert(noexcept(C::from_address(nullptr)), "");
-    // FIXME: Should the return type not be 'C'?
-    static_assert(std::is_same<decltype(C::from_address(nullptr)), C>::value, "");
-    assert(c.address() == nullptr);
-  }
-  {
-    char dummy = 42;
-    C c = C::from_address((void*)&dummy);
-    assert(c.address() == &dummy);
-  }
-}
-
-int main(int, char**)
-{
-  do_test<coro::coroutine_handle<>>();
-  do_test<coro::coroutine_handle<int>>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
deleted file mode 100644
index 0fd56b3..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// namespace std {
-//  template <class P> struct hash<experimental::coroutine_handle<P>>;
-// }
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <memory>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-#include <functional>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class C>
-void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
-  const size_t ExpectLHS = std::hash<void*>{}(reinterpret_cast<void*>(LHSVal));
-  const size_t ExpectRHS = std::hash<void*>{}(reinterpret_cast<void*>(RHSVal));
-  const C LHS = C::from_address(reinterpret_cast<void*>(LHSVal));
-  const C RHS = C::from_address(reinterpret_cast<void*>(RHSVal));
-  const std::hash<C> h;
-  // FIXME: libc++'s implementation hash's the result of LHS.address(), so we
-  // expect that value. However this is not required.
-  assert(h(LHS) == ExpectLHS);
-  assert(h(RHS) == ExpectRHS);
-  assert((h(LHS) == h(RHS)) == (LHSVal == RHSVal));
-  {
-    ASSERT_SAME_TYPE(decltype(h(LHS)), size_t);
-    ASSERT_NOEXCEPT(std::hash<C>{}(LHS));
-  }
-}
-
-int main(int, char**)
-{
-  std::pair<uintptr_t, uintptr_t> const TestCases[] = {
-      {0, 0},
-      {0, 8},
-      {8, 8},
-      {8, 16}
-  };
-  for (auto& TC : TestCases) {
-    do_test<coro::coroutine_handle<>>(TC.first, TC.second);
-    do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp
deleted file mode 100644
index de53b0a..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp
+++ /dev/null
@@ -1,77 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-// UNSUPPORTED: ubsan
-
-// <experimental/coroutine>
-// struct noop_coroutine_promise;
-// using noop_coroutine_handle = coroutine_handle<noop_coroutine_promise>;
-// noop_coroutine_handle noop_coroutine() noexcept;
-
-#include <experimental/coroutine>
-#include <cassert>
-#include <type_traits>
-
-#include "test_macros.h"
-
-#if TEST_HAS_BUILTIN(__builtin_coro_noop)
-
-namespace coro = std::experimental::coroutines_v1;
-
-
-static_assert(std::is_same<coro::coroutine_handle<coro::noop_coroutine_promise>, coro::noop_coroutine_handle>::value, "");
-static_assert(std::is_same<decltype(coro::noop_coroutine()), coro::noop_coroutine_handle>::value, "");
-
-// template <> struct coroutine_handle<noop_coroutine_promise> : coroutine_handle<>
-// {
-// // 18.11.2.7 noop observers
-// constexpr explicit operator bool() const noexcept;
-// constexpr bool done() const noexcept;
-
-// // 18.11.2.8 noop resumption
-// constexpr void operator()() const noexcept;
-// constexpr void resume() const noexcept;
-// constexpr void destroy() const noexcept;
-
-// // 18.11.2.9 noop promise access
-// noop_coroutine_promise& promise() const noexcept;
-
-// // 18.11.2.10 noop address
-// constexpr void* address() const noexcept;
-
-int main(int, char**)
-{
-  auto h = coro::noop_coroutine();
-  coro::coroutine_handle<> base = h;
-
-  assert(h);
-  assert(base);
-
-  assert(!h.done());
-  assert(!base.done());
-
-  h.resume();
-  h.destroy();
-  h();
-  static_assert(h.done() == false, "");
-  static_assert(h, "");
-
-  h.promise();
-  assert(h.address() == base.address());
-  assert(h.address() != nullptr);
-  assert(coro::coroutine_handle<>::from_address(h.address()) == base);
-
-  return 0;
-}
-
-#else
-
-int main(int, char**) { return 0; }
-
-#endif //  TEST_HAS_BUILTIN(__builtin_coro_noop)
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp
deleted file mode 100644
index d493e1c..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp
+++ /dev/null
@@ -1,84 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise>
-// struct coroutine_handle<Promise>;
-
-// Promise& promise() const
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <memory>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-struct MyCoro {
-  struct promise_type {
-    void unhandled_exception() {}
-    void return_void() {}
-    coro::suspend_never initial_suspend() { return {}; }
-    coro::suspend_never final_suspend() noexcept { return {}; }
-    MyCoro get_return_object() {
-      do_runtime_test();
-      return {};
-    }
-    void do_runtime_test() {
-      // Test that a coroutine_handle<const T> can be created from a const
-      // promise_type and that it represents the same coroutine as
-      // coroutine_handle<T>
-      using CH = coro::coroutine_handle<promise_type>;
-      using CCH = coro::coroutine_handle<const promise_type>;
-      const auto &cthis = *this;
-      CH h = CH::from_promise(*this);
-      CCH h2 = CCH::from_promise(*this);
-      CCH h3 = CCH::from_promise(cthis);
-      assert(&h.promise() == this);
-      assert(&h2.promise() == this);
-      assert(&h3.promise() == this);
-      assert(h.address() == h2.address());
-      assert(h2.address() == h3.address());
-    }
-  };
-};
-
-MyCoro do_runtime_test() {
-  co_await coro::suspend_never{};
-}
-
-template <class Promise>
-void do_test(coro::coroutine_handle<Promise>&& H) {
-
-  // FIXME Add a runtime test
-  {
-    ASSERT_SAME_TYPE(decltype(H.promise()), Promise&);
-    LIBCPP_ASSERT_NOT_NOEXCEPT(H.promise());
-  }
-  {
-    auto const& CH = H;
-    ASSERT_SAME_TYPE(decltype(CH.promise()), Promise&);
-    LIBCPP_ASSERT_NOT_NOEXCEPT(CH.promise());
-  }
-}
-
-int main(int, char**)
-{
-  do_test(coro::coroutine_handle<int>{});
-  do_test(coro::coroutine_handle<const int>{});
-  do_runtime_test();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp
deleted file mode 100644
index 3a27f2a..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp
+++ /dev/null
@@ -1,61 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// void destroy()
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <memory>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class H>
-auto has_destroy_imp(H&& h, int) -> decltype(h.destroy(), std::true_type{});
-template <class H>
-auto has_destroy_imp(H&&, long) -> std::false_type;
-
-template <class H>
-constexpr bool has_destroy() {
-  return decltype(has_destroy_imp(std::declval<H>(), 0))::value;
-}
-
-template <class Promise>
-void do_test(coro::coroutine_handle<Promise>&& H) {
-  using HType = coro::coroutine_handle<Promise>;
-  // FIXME Add a runtime test
-  {
-    ASSERT_SAME_TYPE(decltype(H.destroy()), void);
-    LIBCPP_ASSERT_NOT_NOEXCEPT(H.destroy());
-    static_assert(has_destroy<HType&>(), "");
-    static_assert(has_destroy<HType&&>(), "");
-  }
-  {
-    static_assert(!has_destroy<HType const&>(), "");
-    static_assert(!has_destroy<HType const&&>(), "");
-  }
-}
-
-int main(int, char**)
-{
-  do_test(coro::coroutine_handle<>{});
-  do_test(coro::coroutine_handle<int>{});
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp
deleted file mode 100644
index 77d8d63..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp
+++ /dev/null
@@ -1,80 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// template <class Promise = void>
-// struct coroutine_handle;
-
-// void operator()()
-// void resume()
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <memory>
-#include <utility>
-#include <cstdint>
-#include <cassert>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-
-template <class H>
-auto has_resume_imp(H&& h, int) -> decltype(h.resume(), std::true_type{});
-template <class H>
-auto has_resume_imp(H&&, long) -> std::false_type;
-
-template <class H>
-constexpr bool has_resume() {
-  return decltype(has_resume_imp(std::declval<H>(), 0))::value;
-}
-
-
-template <class H>
-auto has_call_operator_imp(H&& h, int) -> decltype(h(), std::true_type{});
-template <class H>
-auto has_call_operator_imp(H&&, long) -> std::false_type;
-
-template <class H>
-constexpr bool has_call_operator() {
-  return decltype(has_call_operator_imp(std::declval<H>(), 0))::value;
-}
-
-template <class Promise>
-void do_test(coro::coroutine_handle<Promise>&& H) {
-  using HType = coro::coroutine_handle<Promise>;
-  // FIXME Add a runtime test
-  {
-    ASSERT_SAME_TYPE(decltype(H.resume()), void);
-    ASSERT_SAME_TYPE(decltype(H()), void);
-    LIBCPP_ASSERT_NOT_NOEXCEPT(H.resume());
-    LIBCPP_ASSERT_NOT_NOEXCEPT(H());
-    static_assert(has_resume<HType&>(), "");
-    static_assert(has_resume<HType&&>(), "");
-    static_assert(has_call_operator<HType&>(), "");
-    static_assert(has_call_operator<HType&&>(), "");
-  }
-  {
-    static_assert(!has_resume<HType const&>(), "");
-    static_assert(!has_resume<HType const&&>(), "");
-    static_assert(!has_call_operator<HType const&>(), "");
-    static_assert(!has_call_operator<HType const&&>(), "");
-  }
-}
-
-int main(int, char**)
-{
-  do_test(coro::coroutine_handle<>{});
-  do_test(coro::coroutine_handle<int>{});
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp
deleted file mode 100644
index 1f48408..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-struct A {
-  using promise_type = A*;
-};
-
-struct B {};
-struct C {};
-
-namespace std { namespace experimental {
-  template <>
-  struct coroutine_traits<::A, int> {
-    using promise_type = int*;
-  };
-  template <class ...Args>
-  struct coroutine_traits<::B, Args...> {
-    using promise_type = B*;
-  };
-  template <>
-  struct coroutine_traits<::C> {
-    using promise_type = void;
-  };
-}}
-
-template <class Expect, class T, class ...Args>
-void check_type() {
-  using P = typename coro::coroutine_traits<T, Args...>::promise_type ;
-  static_assert(std::is_same<P, Expect>::value, "");
-};
-
-int main(int, char**)
-{
-  check_type<A*, A>();
-  check_type<int*, A, int>();
-  check_type<B*, B>();
-  check_type<void, C>();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp
deleted file mode 100644
index dd95493..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp
+++ /dev/null
@@ -1,79 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-template <class T, class = typename T::promise_type>
-constexpr bool has_promise_type(int) { return true; }
-template <class>
-constexpr bool has_promise_type(long) { return false; }
-template <class T>
-constexpr bool has_promise_type() { return has_promise_type<T>(0); }
-
-struct A {
-  using promise_type = A*;
-};
-
-struct B {};
-struct C {};
-struct D {
-private:
-  using promise_type = void;
-};
-struct E {};
-
-namespace std { namespace experimental {
-  template <>
-  struct coroutine_traits<::A, int> {
-    using promise_type = int*;
-  };
-  template <class ...Args>
-  struct coroutine_traits<::B, Args...> {
-    using promise_type = B*;
-  };
-  template <>
-  struct coroutine_traits<::C> {
-    using promise_type = void;
-  };
-}}
-
-template <class Expect, class T, class ...Args>
-void check_type() {
-  using Traits = coro::coroutine_traits<T, Args...>;
-  static_assert(has_promise_type<Traits>(), "");
-  static_assert(std::is_same<typename Traits::promise_type, Expect>::value, "");
-}
-
-template <class T, class ...Args>
-void check_no_type() {
-  using Traits = coro::coroutine_traits<T, Args...>;
-  static_assert(!has_promise_type<Traits>(), "");
-}
-
-int main(int, char**)
-{
-  {
-    check_type<A*, A>();
-    check_type<int*, A, int>();
-    check_type<B*, B>();
-    check_type<void, C>();
-  }
-  {
-    check_no_type<D>();
-    check_no_type<E>();
-    check_no_type<C, int>();
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp
deleted file mode 100644
index dd5673b..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp
+++ /dev/null
@@ -1,67 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-#include <utility>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-using SuspendT = std::experimental::coroutines_v1::suspend_always;
-
-constexpr bool check_suspend_constexpr() {
-  SuspendT s;
-  const SuspendT scopy(s); (void)scopy;
-  SuspendT smove(std::move(s)); (void)smove;
-  s = scopy;
-  s = std::move(smove);
-  return true;
-}
-
-int main(int, char**)
-{
-  using H = coro::coroutine_handle<>;
-  using S = SuspendT;
-  H h{};
-  S s{};
-  S const& cs = s;
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_ready()), "");
-    static_assert(std::is_same<decltype(s.await_ready()), bool>::value, "");
-    assert(s.await_ready() == false);
-    assert(cs.await_ready() == false);
-  }
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_suspend(h)), "");
-    static_assert(std::is_same<decltype(s.await_suspend(h)), void>::value, "");
-    s.await_suspend(h);
-    cs.await_suspend(h);
-  }
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_resume()), "");
-    static_assert(std::is_same<decltype(s.await_resume()), void>::value, "");
-    s.await_resume();
-    cs.await_resume();
-  }
-  {
-    static_assert(std::is_nothrow_default_constructible<S>::value, "");
-    static_assert(std::is_nothrow_copy_constructible<S>::value, "");
-    static_assert(std::is_nothrow_move_constructible<S>::value, "");
-    static_assert(std::is_nothrow_copy_assignable<S>::value, "");
-    static_assert(std::is_nothrow_move_assignable<S>::value, "");
-    static_assert(std::is_trivially_copyable<S>::value, "");
-    static_assert(check_suspend_constexpr(), "");
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp
deleted file mode 100644
index 8d59d6a..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp
+++ /dev/null
@@ -1,68 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <type_traits>
-#include <cassert>
-#include <utility>
-
-#include "test_macros.h"
-
-namespace coro = std::experimental;
-
-using SuspendT = std::experimental::coroutines_v1::suspend_never;
-
-constexpr bool check_suspend_constexpr() {
-  SuspendT s;
-  const SuspendT scopy(s); (void)scopy;
-  SuspendT smove(std::move(s)); (void)smove;
-  s = scopy;
-  s = std::move(smove);
-  return true;
-}
-
-
-int main(int, char**)
-{
-  using H = coro::coroutine_handle<>;
-  using S = SuspendT;
-  H h{};
-  S s{};
-  S const& cs = s;
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_ready()), "");
-    static_assert(std::is_same<decltype(s.await_ready()), bool>::value, "");
-    assert(s.await_ready() == true);
-    assert(cs.await_ready() == true);
-  }
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_suspend(h)), "");
-    static_assert(std::is_same<decltype(s.await_suspend(h)), void>::value, "");
-    s.await_suspend(h);
-    cs.await_suspend(h);
-  }
-  {
-    LIBCPP_STATIC_ASSERT(noexcept(s.await_resume()), "");
-    static_assert(std::is_same<decltype(s.await_resume()), void>::value, "");
-    s.await_resume();
-    cs.await_resume();
-  }
-  {
-    static_assert(std::is_nothrow_default_constructible<S>::value, "");
-    static_assert(std::is_nothrow_copy_constructible<S>::value, "");
-    static_assert(std::is_nothrow_move_constructible<S>::value, "");
-    static_assert(std::is_nothrow_copy_assignable<S>::value, "");
-    static_assert(std::is_nothrow_move_assignable<S>::value, "");
-    static_assert(std::is_trivially_copyable<S>::value, "");
-    static_assert(check_suspend_constexpr(), "");
-  }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp
deleted file mode 100644
index 2b4dac2..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp
+++ /dev/null
@@ -1,71 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-struct coro_t {
-  struct promise_type {
-    coro_t get_return_object() {
-      coroutine_handle<promise_type>{};
-      return {};
-    }
-    suspend_never initial_suspend() { return {}; }
-    suspend_never final_suspend() noexcept { return {}; }
-    void return_void() {}
-    static void unhandled_exception() {}
-  };
-};
-
-struct B {
-  ~B() {}
-  bool await_ready() { return true; }
-  B await_resume() { return {}; }
-  template <typename F> void await_suspend(F) {}
-};
-
-
-struct A {
-  ~A() {}
-  bool await_ready() { return true; }
-  int await_resume() { return 42; }
-  template <typename F> void await_suspend(F) {}
-};
-
-int last_value = -1;
-void set_value(int x) {
-  last_value = x;
-}
-
-coro_t f(int n) {
-  if (n == 0) {
-    set_value(0);
-    co_return;
-  }
-  int val = co_await A{};
-  ((void)val);
-  set_value(42);
-}
-
-coro_t g() { B val = co_await B{}; }
-
-int main(int, char**) {
-  last_value = -1;
-  f(0);
-  assert(last_value == 0);
-  f(1);
-  assert(last_value == 42);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
deleted file mode 100644
index 611ee25..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
+++ /dev/null
@@ -1,71 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// See https://llvm.org/PR33271
-// UNSUPPORTED: ubsan
-
-#include <experimental/coroutine>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-struct coro_t {
-  struct promise_type {
-    coro_t get_return_object() {
-      return coroutine_handle<promise_type>::from_promise(*this);
-    }
-    suspend_never initial_suspend() { return {}; }
-    suspend_never final_suspend() noexcept { return {}; }
-    void return_void() {}
-    void unhandled_exception() {}
-  };
-  coro_t(coroutine_handle<promise_type> hh) : h(hh) {}
-  coroutine_handle<promise_type> h;
-};
-
-struct NoSuspend {
-  bool await_ready() { return false; }
-  void await_resume() {}
-  template <typename F> bool await_suspend(F) { return false; }
-};
-
-struct DoSuspend {
-  bool await_ready() { return false; }
-  void await_resume() {}
-  template <typename F> bool await_suspend(F) { return true; }
-};
-
-bool f_started, f_resumed = false;
-coro_t f() {
-  f_started = true;
-  co_await DoSuspend{};
-  f_resumed = true;
-}
-
-bool g_started, g_resumed = false;
-coro_t g() {
-  g_started = true;
-  co_await NoSuspend{};
-  g_resumed = true;
-}
-
-int main(int, char**) {
-  assert(!f_started && !f_resumed && !g_started && !g_resumed);
-  auto fret = f();
-  assert(f_started && !f_resumed);
-  fret.h.destroy();
-  assert(f_started && !f_resumed);
-  g();
-  assert(g_started && g_resumed);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp
deleted file mode 100644
index 59618e2..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp
+++ /dev/null
@@ -1,88 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <cassert>
-#include <memory>
-
-#include "test_macros.h"
-using namespace std::experimental;
-
-struct error_tag { };
-
-template <typename T, typename Error = int>
-struct expected {
-
-  struct Data {
-    Data() : val(), error() { }
-    Data(T v, Error e) : val(v), error(e) { }
-    T val;
-    Error error;
-  };
-  std::shared_ptr<Data> data;
-
-  expected(T val) : data(std::make_shared<Data>(val, Error())) {}
-  expected(error_tag, Error error) : data(std::make_shared<Data>(T(), error)) {}
-  expected(std::shared_ptr<Data> p) : data(p) {}
-
-  struct promise_type {
-    std::shared_ptr<Data> data;
-    expected get_return_object() { data = std::make_shared<Data>(); return {data}; }
-    suspend_never initial_suspend() { return {}; }
-    suspend_never final_suspend() noexcept { return {}; }
-    void return_value(T v) { data->val = v; data->error = {}; }
-    void unhandled_exception() {}
-  };
-
-  bool await_ready() { return !data->error; }
-  T await_resume() { return data->val; }
-  void await_suspend(coroutine_handle<promise_type> h) {
-    h.promise().data->error = data->error;
-    h.destroy();
-  }
-
-  T const& value() { return data->val; }
-  Error const& error() { return data->error; }
-};
-
-expected<int> g() { return {0}; }
-expected<int> h() { return {error_tag{}, 42}; }
-
-extern "C" void print(int);
-
-bool f1_started, f1_resumed = false;
-expected<int> f1() {
-  f1_started = true;
-  (void)(co_await g());
-  f1_resumed = true;
-  co_return 100;
-}
-
-bool f2_started, f2_resumed = false;
-expected<int> f2() {
-  f2_started = true;
-  (void)(co_await h());
-  f2_resumed = true;
-  co_return 200;
-}
-
-int main(int, char**) {
-  auto c1 = f1();
-  assert(f1_started && f1_resumed);
-  assert(c1.value() == 100);
-  assert(c1.error() == 0);
-
-  auto c2 = f2();
-  assert(f2_started && !f2_resumed);
-  assert(c2.value() == 0);
-  assert(c2.error() == 42);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp
deleted file mode 100644
index de1b054..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp
+++ /dev/null
@@ -1,117 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-int alive = 0;
-int ctor_called = 0;
-int dtor_called = 0;
-void reset() {
-  assert(alive == 0);
-  alive = 0;
-  ctor_called = 0;
-  dtor_called = 0;
-}
-struct Noisy {
-  Noisy() { ++alive; ++ctor_called; }
-  ~Noisy() { --alive; ++dtor_called; }
-#if TEST_STD_VER > 14
-  Noisy(Noisy const&) = delete;
-#else
-  // FIXME: This test depends on copy elision taking place in C++14
-  // (pre-C++17 guaranteed copy elision)
-  Noisy(Noisy const&);
-#endif
-};
-
-struct Bug {
-  bool await_ready() { return true; }
-  void await_suspend(std::experimental::coroutine_handle<>) {}
-  Noisy await_resume() { return {}; }
-};
-struct coro2 {
-  struct promise_type {
-    suspend_never initial_suspend() { return{}; }
-    suspend_never final_suspend() noexcept { return {}; }
-    coro2 get_return_object() { return{}; }
-    void return_void() {}
-    Bug yield_value(int) { return {}; }
-    void unhandled_exception() {}
-  };
-};
-
-// Checks that destructors are correctly invoked for the object returned by
-// coawait.
-coro2 a() {
-  reset();
-  {
-    auto x = co_await Bug{};
-    assert(alive == 1);
-    assert(ctor_called == 1);
-    assert(dtor_called == 0);
-    ((void)x);
-  }
-  assert(alive == 0);
-  assert(dtor_called == 1);
-}
-
-coro2 b() {
-  reset();
-  {
-    (void)(co_await Bug{});
-    assert(ctor_called == 1);
-    assert(dtor_called == 1);
-    assert(alive == 0);
-  }
-  assert(ctor_called == 1);
-  assert(dtor_called == 1);
-  assert(alive == 0);
-
-}
-
-coro2 c() {
-  reset();
-  {
-    auto x = co_yield 42;
-    assert(alive == 1);
-    assert(ctor_called == 1);
-    assert(dtor_called == 0);
-  }
-  assert(alive == 0);
-  assert(ctor_called == 1);
-  assert(dtor_called == 1);
-}
-
-coro2 d() {
-  reset();
-  {
-    (void)(co_yield 42);
-    assert(ctor_called == 1);
-    assert(dtor_called == 1);
-    assert(alive == 0);
-  }
-  assert(alive == 0);
-  assert(ctor_called == 1);
-  assert(dtor_called == 1);
-}
-
-int main(int, char**) {
-  a();
-  b();
-  c();
-  d();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
deleted file mode 100644
index 2a05e8e..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
+++ /dev/null
@@ -1,161 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// See https://llvm.org/PR33271
-// UNSUPPORTED: ubsan
-
-#include <experimental/coroutine>
-#include <vector>
-#include <cassert>
-
-#include "test_macros.h"
-
-
-template <typename Ty> struct generator {
-  struct promise_type {
-    Ty current_value;
-    std::experimental::suspend_always yield_value(Ty value) {
-      this->current_value = value;
-      return {};
-    }
-    std::experimental::suspend_always initial_suspend() { return {}; }
-    std::experimental::suspend_always final_suspend() noexcept { return {}; }
-    generator get_return_object() { return generator{this}; };
-    void return_void() {}
-    void unhandled_exception() {}
-  };
-
-  struct iterator {
-    std::experimental::coroutine_handle<promise_type> _Coro;
-    bool _Done;
-
-    iterator(std::experimental::coroutine_handle<promise_type> Coro, bool Done)
-        : _Coro(Coro), _Done(Done) {}
-
-    iterator &operator++() {
-      _Coro.resume();
-      _Done = _Coro.done();
-      return *this;
-    }
-
-    bool operator==(iterator const &_Right) const {
-      return _Done == _Right._Done;
-    }
-
-    bool operator!=(iterator const &_Right) const { return !(*this == _Right); }
-
-    Ty const &operator*() const { return _Coro.promise().current_value; }
-
-    Ty const *operator->() const { return &(operator*()); }
-  };
-
-  iterator begin() {
-    p.resume();
-    return {p, p.done()};
-  }
-
-  iterator end() { return {p, true}; }
-
-  generator(generator &&rhs) : p(rhs.p) { rhs.p = nullptr; }
-
-  ~generator() {
-    if (p)
-      p.destroy();
-  }
-
-private:
-  explicit generator(promise_type *p)
-      : p(std::experimental::coroutine_handle<promise_type>::from_promise(*p)) {}
-
-  std::experimental::coroutine_handle<promise_type> p;
-};
-
-struct minig {
-  struct promise_type {
-    int current_value;
-    std::experimental::suspend_always yield_value(int value) {
-      this->current_value = value;
-      return {};
-    }
-    std::experimental::suspend_always initial_suspend() { return {}; }
-    std::experimental::suspend_always final_suspend() noexcept { return {}; }
-    minig get_return_object() { return minig{this}; };
-    void return_void() {}
-    void unhandled_exception() {}
-  };
-
-  bool move_next() {
-    p.resume();
-    return !p.done();
-  }
-  int current_value() { return p.promise().current_value; }
-
-  minig(minig &&rhs) : p(rhs.p) { rhs.p = nullptr; }
-
-  ~minig() {
-    if (p)
-      p.destroy();
-  }
-
-private:
-  explicit minig(promise_type *p)
-      : p(std::experimental::coroutine_handle<promise_type>::from_promise(*p)) {}
-
-  std::experimental::coroutine_handle<promise_type> p;
-};
-
-
-minig mini_count(int n) {
-  for (int i = 0; i < n; i++) {
-    co_yield i;
-  }
-}
-
-generator<int> count(int n) {
-  for (int i = 0; i < n; ++i)
-    co_yield i;
-}
-
-generator<int> range(int from, int n) {
-  for (int i = from; i < n; ++i)
-    co_yield i;
-}
-
-void test_count() {
-  const std::vector<int> expect = {0, 1, 2, 3, 4};
-  std::vector<int> got;
-  for (auto x : count(5))
-    got.push_back(x);
-  assert(expect == got);
-}
-
-void test_range() {
-  int sum = 0;
-   for (auto v: range(1, 20))
-      sum += v;
-   assert(sum == 190);
-}
-
-void test_mini_generator() {
-  int sum = 0;
-  auto g = mini_count(5);
-  while (g.move_next()) {
-     sum += g.current_value();
-  }
-  assert(sum == 10);
-}
-
-int main(int, char**) {
-  test_count();
-  test_range();
-  test_mini_generator();
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp
deleted file mode 100644
index 3e323ad..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp
+++ /dev/null
@@ -1,176 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-bool cancel = false;
-
-struct goroutine
-{
-  static int const N = 10;
-  static int count;
-  static coroutine_handle<> stack[N];
-
-  static void schedule(coroutine_handle<>& rh)
-  {
-    assert(count < N);
-    stack[count++] = rh;
-    rh = nullptr;
-  }
-
-  ~goroutine() {}
-
-  static void go(goroutine) {}
-
-  static void run_one()
-  {
-    assert(count > 0);
-    stack[--count]();
-  }
-
-  struct promise_type
-  {
-    suspend_never initial_suspend() {
-      return {};
-    }
-    suspend_never final_suspend() noexcept { return {}; }
-    void return_void() {}
-    goroutine get_return_object() {
-      return{};
-    }
-    void unhandled_exception() {}
-  };
-};
-int goroutine::count;
-coroutine_handle<> goroutine::stack[N];
-
-coroutine_handle<goroutine::promise_type> workaround;
-
-class channel;
-
-struct push_awaiter {
-  channel* ch;
-  bool await_ready() {return false; }
-  void await_suspend(coroutine_handle<> rh);
-  void await_resume() {}
-};
-
-struct pull_awaiter {
-  channel * ch;
-
-  bool await_ready();
-  void await_suspend(coroutine_handle<> rh);
-  int await_resume();
-};
-
-class channel
-{
-  using T = int;
-
-  friend struct push_awaiter;
-  friend struct pull_awaiter;
-
-  T const* pvalue = nullptr;
-  coroutine_handle<> reader = nullptr;
-  coroutine_handle<> writer = nullptr;
-public:
-  push_awaiter push(T const& value)
-  {
-    assert(pvalue == nullptr);
-    assert(!writer);
-    pvalue = &value;
-
-    return { this };
-  }
-
-  pull_awaiter pull()
-  {
-    assert(!reader);
-
-    return { this };
-  }
-
-  void sync_push(T const& value)
-  {
-    assert(!pvalue);
-    pvalue = &value;
-    assert(reader);
-    reader();
-    assert(!pvalue);
-    reader = nullptr;
-  }
-
-  auto sync_pull()
-  {
-    while (!pvalue) goroutine::run_one();
-    auto result = *pvalue;
-    pvalue = nullptr;
-    if (writer)
-    {
-      auto wr = writer;
-      writer = nullptr;
-      wr();
-    }
-    return result;
-  }
-};
-
-void push_awaiter::await_suspend(coroutine_handle<> rh)
-{
-  ch->writer = rh;
-  if (ch->reader) goroutine::schedule(ch->reader);
-}
-
-
-bool pull_awaiter::await_ready() {
-  return !!ch->writer;
-}
-void pull_awaiter::await_suspend(coroutine_handle<> rh) {
-  ch->reader = rh;
-}
-int pull_awaiter::await_resume() {
-  auto result = *ch->pvalue;
-  ch->pvalue = nullptr;
-  if (ch->writer) {
-    //goroutine::schedule(ch->writer);
-    auto wr = ch->writer;
-    ch->writer = nullptr;
-    wr();
-  }
-  return result;
-}
-
-goroutine pusher(channel& left, channel& right)
-{
-  for (;;) {
-    auto val = co_await left.pull();
-    co_await right.push(val + 1);
-  }
-}
-
-const int N = 100;
-channel* c = new channel[N + 1];
-
-int main(int, char**) {
-  for (int i = 0; i < N; ++i)
-    goroutine::go(pusher(c[i], c[i + 1]));
-
-  c[0].sync_push(0);
-  int result = c[N].sync_pull();
-
-  assert(result == 100);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp
deleted file mode 100644
index dd8c5ea..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp
+++ /dev/null
@@ -1,89 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-#include <experimental/coroutine>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-// This file tests, multishot, movable std::function like thing using coroutine
-// for compile-time type erasure and unerasure.
-template <typename R> struct func {
-  struct Input {R a, b;};
-
-  struct promise_type {
-    Input* I;
-    R result;
-    func get_return_object() { return {this}; }
-    suspend_always initial_suspend() { return {}; }
-    suspend_never final_suspend() noexcept { return {}; }
-    void return_void() {}
-    template <typename F>
-    suspend_always yield_value(F&& f) {
-      result = f(I->a, I->b);
-      return {};
-    }
-    void unhandled_exception() {}
-  };
-
-  R operator()(Input I) {
-    h.promise().I = &I;
-    h.resume();
-    R result = h.promise().result;
-    return result;
-  };
-
-  func() {}
-  func(func &&rhs) : h(rhs.h) { rhs.h = nullptr; }
-  func(func const &) = delete;
-
-  func &operator=(func &&rhs) {
-    if (this != &rhs) {
-      if (h)
-        h.destroy();
-      h = rhs.h;
-      rhs.h = nullptr;
-    }
-    return *this;
-  }
-
-  template <typename F> static func Create(F f) {
-    for (;;) {
-      co_yield f;
-    }
-  }
-
-  template <typename F> func(F f) : func(Create(f)) {}
-
-  ~func() {
-    if (h)
-      h.destroy();
-  }
-
-private:
-  func(promise_type *promise)
-      : h(coroutine_handle<promise_type>::from_promise(*promise)) {}
-  coroutine_handle<promise_type> h;
-};
-
-int Do(int acc, int n, func<int> f) {
-  for (int i = 0; i < n; ++i)
-    acc = f({acc, i});
-  return acc;
-}
-
-int main(int, char**) {
-  int result = Do(1, 10, [](int a, int b) {return a + b;});
-  assert(result == 46);
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp
deleted file mode 100644
index 105ca8a..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp
+++ /dev/null
@@ -1,87 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// XFAIL: libcpp-has-debug-mode
-
-#include <experimental/coroutine>
-#include <vector>
-#include <cassert>
-
-#include "test_macros.h"
-
-using namespace std::experimental;
-
-// This file tests, one shot, movable std::function like thing using coroutine
-// for compile-time type erasure and unerasure.
-
-template <typename R> struct func {
-  struct promise_type {
-    R result;
-    func get_return_object() { return {this}; }
-    suspend_always initial_suspend() { return {}; }
-    suspend_always final_suspend() noexcept { return {}; }
-    void return_value(R v) { result = v; }
-    void unhandled_exception() {}
-  };
-
-  R operator()() {
-    h.resume();
-    R result = h.promise().result;
-    h.destroy();
-    h = nullptr;
-    return result;
-  };
-
-  func() {}
-  func(func &&rhs) : h(rhs.h) { rhs.h = nullptr; }
-  func(func const &) = delete;
-
-  func &operator=(func &&rhs) {
-    if (this != &rhs) {
-      if (h)
-        h.destroy();
-      h = rhs.h;
-      rhs.h = nullptr;
-    }
-    return *this;
-  }
-
-  template <typename F> static func Create(F f) { co_return f(); }
-
-  template <typename F> func(F f) : func(Create(f)) {}
-
-  ~func() {
-    if (h)
-      h.destroy();
-  }
-
-private:
-  func(promise_type *promise)
-      : h(coroutine_handle<promise_type>::from_promise(*promise)) {}
-  coroutine_handle<promise_type> h;
-};
-
-std::vector<int> yielded_values = {};
-int yield(int x) { yielded_values.push_back(x); return x + 1; }
-float fyield(int x) { yielded_values.push_back(x); return static_cast<float>(x + 2); }
-
-void Do1(func<int> f) { yield(f()); }
-void Do2(func<double> f) { yield(static_cast<int>(f())); }
-
-int main(int, char**) {
-  Do1([] { return yield(43); });
-  assert((yielded_values == std::vector<int>{43, 44}));
-
-  yielded_values = {};
-  Do2([] { return fyield(44); });
-  assert((yielded_values == std::vector<int>{44, 46}));
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/includes.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/includes.pass.cpp
deleted file mode 100644
index ea39576..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/includes.pass.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-
-// <experimental/coroutine>
-
-// Test that <experimental/coroutine> includes <new>
-
-#include <experimental/coroutine>
-
-int main(int, char**) {
-  // std::nothrow is not implicitly defined by the compiler when the include is
-  // missing, unlike other parts of <new>. Therefore we use std::nothrow to
-  // test for #include <new>
-
-  (void)std::nothrow;
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/lit.local.cfg b/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/lit.local.cfg
deleted file mode 100644
index 223de62..0000000
--- a/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/lit.local.cfg
+++ /dev/null
@@ -1,8 +0,0 @@
-# If the compiler doesn't support coroutines mark all of the tests under
-# this directory as unsupported. Otherwise add the required `-fcoroutines-ts`
-# flag.
-if 'fcoroutines-ts' not in config.available_features:
-  config.unsupported = True
-else:
-  config.test_format.addCompileFlags(config, '-fcoroutines-ts')
-  config.test_format.addCompileFlags(config, '-Wno-coroutine')
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
index b4faa68..2f5a43d 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
index f198c52..3153c56 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
index 14d53e4..908e32c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
index 297235e..289d2ee 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
@@ -36,7 +33,7 @@
 
 namespace ex = std::experimental::pmr;
 
-template <size_t S, size_t Align>
+template <std::size_t S, size_t Align>
 void testForSizeAndAlign() {
     struct T { alignas(Align) char data[S]; };
     TestResource R;
@@ -52,7 +49,7 @@
 }
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
-template <size_t S>
+template <std::size_t S>
 void testAllocForSizeThrows() {
     struct T { char data[S]; };
     using Alloc = ex::polymorphic_allocator<T>;
@@ -61,14 +58,14 @@
     Alloc a(&R);
 
     // Test that allocating exactly the max size does not throw.
-    size_t maxSize = Traits::max_size(a);
+    std::size_t maxSize = Traits::max_size(a);
     try {
         a.allocate(maxSize);
     } catch (...) {
         assert(false);
     }
 
-    size_t sizeTypeMax = std::numeric_limits<std::size_t>::max();
+    std::size_t sizeTypeMax = std::numeric_limits<std::size_t>::max();
     if (maxSize != sizeTypeMax)
     {
         // Test that allocating size_t(~0) throws bad_array_new_length.
@@ -79,7 +76,7 @@
         }
 
         // Test that allocating even one more than the max size does throw.
-        size_t overSize = maxSize + 1;
+        std::size_t overSize = maxSize + 1;
         try {
             a.allocate(overSize);
             assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
index 9d653a6..17b9758 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
index dbfddf5..0c09d4c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
index 0d90844..e442e7e 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
index 6641c93..d203864 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
index 0a5b250..c7f49fd 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
index af30ef0..47fbb99 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
index 08716b3..252044a 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
index 0084d37..bdcc581 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
@@ -34,7 +31,7 @@
 
 namespace ex = std::experimental::pmr;
 
-template <size_t S, size_t Align>
+template <std::size_t S, size_t Align>
 void testForSizeAndAlign() {
     struct T { alignas(Align) char data[S]; };
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
index 039a1c7..4075404 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
index 9959573..afe614b 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
index be8673f..d80cb2f 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
index 03fde4d..919c867 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/deque>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
index 614b8c4..0a3c771 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/forward_list>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
index c786a4e..cd9150c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/list>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
index 0671cc7..b59b7f1 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
index 397cb26..c650c87 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
@@ -9,10 +9,7 @@
 // UNSUPPORTED: c++03
 // UNSUPPORTED: no-localization
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/regex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
index ee75125..dcb8290 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
index d8acb05..818c669 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/string>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
index c106829..5f55cc8 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/unordered_map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
index 7cdf1ea..4c80a0c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/unordered_set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
index 0a503bc..783843b 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
index 12d1124..2378d37 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
index 44b00cb..f308752 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
@@ -32,10 +29,10 @@
 struct assert_on_compare : public ex::memory_resource
 {
 protected:
-    void * do_allocate(size_t, size_t) override
+    void * do_allocate(std::size_t, size_t) override
     { assert(false); return nullptr; }
 
-    void do_deallocate(void *, size_t, size_t) override
+    void do_deallocate(void *, std::size_t, size_t) override
     { assert(false); }
 
     bool do_is_equal(ex::memory_resource const &) const noexcept override
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
index 8ac9b8b..e9f57db 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
@@ -32,10 +29,10 @@
 struct assert_on_compare : public ex::memory_resource
 {
 protected:
-    void * do_allocate(size_t, size_t) override
+    void * do_allocate(std::size_t, size_t) override
     { assert(false); return nullptr; }
 
-    void do_deallocate(void *, size_t, size_t) override
+    void do_deallocate(void *, std::size_t, size_t) override
     { assert(false); }
 
     bool do_is_equal(ex::memory_resource const &) const noexcept override
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
index 35a45381a..e918276 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
@@ -42,26 +42,26 @@
     sizeof(ex::simd<char, ex::__simd_abi<ex::_StorageKind::_VecExt, 12>>) == 16,
     "");
 static_assert(
-    sizeof(ex::simd<int32_t, ex::__simd_abi<ex::_StorageKind::_VecExt, 3>>) ==
+    sizeof(ex::simd<std::int32_t, ex::__simd_abi<ex::_StorageKind::_VecExt, 3>>) ==
         16,
     "");
 static_assert(
-    sizeof(ex::simd<int32_t, ex::__simd_abi<ex::_StorageKind::_VecExt, 5>>) ==
+    sizeof(ex::simd<std::int32_t, ex::__simd_abi<ex::_StorageKind::_VecExt, 5>>) ==
         32,
     "");
 static_assert(
-    std::is_same<ex::simd_abi::native<int8_t>,
+    std::is_same<ex::simd_abi::native<std::int8_t>,
                  ex::__simd_abi<ex::_StorageKind::_VecExt, reg_width()>>::value,
     "");
 #else
 static_assert(
-    std::is_same<ex::simd_abi::native<int8_t>,
+    std::is_same<ex::simd_abi::native<std::int8_t>,
                  ex::__simd_abi<ex::_StorageKind::_Array, reg_width()>>::value,
     "");
 
 #endif
 
-static_assert(std::is_same<ex::simd_abi::compatible<int8_t>,
+static_assert(std::is_same<ex::simd_abi::compatible<std::int8_t>,
                            ex::__simd_abi<ex::_StorageKind::_Array, 16>>::value,
               "");
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.access/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
index 2ca5ec4..a8ec36c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
@@ -26,7 +26,7 @@
 void test_access() {
   {
     SimdType a(42), b(4);
-    static_assert(std::is_convertible<decltype(a[0]), int8_t>::value, "");
+    static_assert(std::is_convertible<decltype(a[0]), std::int8_t>::value, "");
 
     assert(a[0] == 42);
     assert(!a[0] == !42);
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
index 038af4b..3a58f9f 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
@@ -22,26 +22,26 @@
 namespace ex = std::experimental::parallelism_v2;
 
 static_assert(
-    std::is_same<decltype(ex::simd_cast<int32_t>(ex::native_simd<int32_t>())),
-                 ex::native_simd<int32_t>>::value,
+    std::is_same<decltype(ex::simd_cast<std::int32_t>(ex::native_simd<std::int32_t>())),
+                 ex::native_simd<std::int32_t>>::value,
     "");
 
-static_assert(std::is_same<decltype(ex::simd_cast<int64_t>(
-                               ex::fixed_size_simd<int32_t, 4>())),
-                           ex::fixed_size_simd<int64_t, 4>>::value,
+static_assert(std::is_same<decltype(ex::simd_cast<std::int64_t>(
+                               ex::fixed_size_simd<std::int32_t, 4>())),
+                           ex::fixed_size_simd<std::int64_t, 4>>::value,
               "");
 
 static_assert(
-    std::is_same<decltype(ex::simd_cast<ex::fixed_size_simd<int64_t, 1>>(
-                     ex::simd<int32_t, ex::simd_abi::scalar>())),
-                 ex::fixed_size_simd<int64_t, 1>>::value,
+    std::is_same<decltype(ex::simd_cast<ex::fixed_size_simd<std::int64_t, 1>>(
+                     ex::simd<std::int32_t, ex::simd_abi::scalar>())),
+                 ex::fixed_size_simd<std::int64_t, 1>>::value,
     "");
 
 static_assert(
     std::is_same<
-        decltype(ex::simd_cast<ex::simd<int64_t, ex::simd_abi::scalar>>(
-            ex::fixed_size_simd<int32_t, 1>())),
-        ex::simd<int64_t, ex::simd_abi::scalar>>::value,
+        decltype(ex::simd_cast<ex::simd<std::int64_t, ex::simd_abi::scalar>>(
+            ex::fixed_size_simd<std::int32_t, 1>())),
+        ex::simd<std::int64_t, ex::simd_abi::scalar>>::value,
     "");
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/broadcast.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
index 94f9cb7..edf6ba5 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
@@ -37,43 +37,43 @@
 void supported_native_simd_ctor(...) = delete;
 
 void compile_narrowing_conversion() {
-  supported_native_simd_ctor<int8_t>(3);
-  supported_native_simd_ctor<int16_t>(3);
-  supported_native_simd_ctor<int32_t>(3);
-  supported_native_simd_ctor<int64_t>(3);
-  supported_native_simd_ctor<uint8_t>(3);
-  supported_native_simd_ctor<uint16_t>(3);
-  supported_native_simd_ctor<uint32_t>(3);
-  supported_native_simd_ctor<uint64_t>(3);
+  supported_native_simd_ctor<std::int8_t>(3);
+  supported_native_simd_ctor<std::int16_t>(3);
+  supported_native_simd_ctor<std::int32_t>(3);
+  supported_native_simd_ctor<std::int64_t>(3);
+  supported_native_simd_ctor<std::uint8_t>(3);
+  supported_native_simd_ctor<std::uint16_t>(3);
+  supported_native_simd_ctor<std::uint32_t>(3);
+  supported_native_simd_ctor<std::uint64_t>(3);
   supported_native_simd_ctor<float>(3.f);
   supported_native_simd_ctor<double>(3.);
   supported_native_simd_ctor<long double>(3.);
 
   not_supported_native_simd_ctor<float>(3.);
-  not_supported_native_simd_ctor<int8_t>(long(3));
+  not_supported_native_simd_ctor<std::int8_t>(long(3));
   not_supported_native_simd_ctor<float>(long(3));
   not_supported_native_simd_ctor<int>(3.);
 }
 
 void compile_convertible() {
   struct ConvertibleToInt {
-    operator int64_t() const;
+    operator std::int64_t() const;
   };
-  supported_native_simd_ctor<int64_t>(ConvertibleToInt());
+  supported_native_simd_ctor<std::int64_t>(ConvertibleToInt());
 
   struct NotConvertibleToInt {};
-  not_supported_native_simd_ctor<int64_t>(NotConvertibleToInt());
+  not_supported_native_simd_ctor<std::int64_t>(NotConvertibleToInt());
 }
 
 void compile_unsigned() {
   not_supported_native_simd_ctor<int>(3u);
-  supported_native_simd_ctor<uint16_t>(3u);
+  supported_native_simd_ctor<std::uint16_t>(3u);
 }
 
 template <typename SimdType>
 void test_broadcast() {
   SimdType a(3);
-  for (size_t i = 0; i < a.size(); i++) {
+  for (std::size_t i = 0; i < a.size(); i++) {
     assert(a[i] == 3);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/default.pass.cpp
index feba23e..753917e 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/default.pass.cpp
@@ -21,10 +21,10 @@
 namespace ex = std::experimental::parallelism_v2;
 
 int main(int, char**) {
-  static_assert(ex::native_simd<int32_t>().size() > 0, "");
-  static_assert(ex::fixed_size_simd<int32_t, 4>().size() == 4, "");
-  static_assert(ex::fixed_size_simd<int32_t, 5>().size() == 5, "");
-  static_assert(ex::fixed_size_simd<int32_t, 1>().size() == 1, "");
+  static_assert(ex::native_simd<std::int32_t>().size() > 0, "");
+  static_assert(ex::fixed_size_simd<std::int32_t, 4>().size() == 4, "");
+  static_assert(ex::fixed_size_simd<std::int32_t, 5>().size() == 5, "");
+  static_assert(ex::fixed_size_simd<std::int32_t, 1>().size() == 1, "");
   static_assert(ex::fixed_size_simd<char, 32>().size() == 32, "");
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/generator.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/generator.pass.cpp
index ace829f..05a1289 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/generator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/generator.pass.cpp
@@ -38,8 +38,8 @@
 void supported_simd128_ctor(...) = delete;
 
 struct identity {
-  template <size_t value>
-  int operator()(std::integral_constant<size_t, value>) const {
+  template <std::size_t value>
+  int operator()(std::integral_constant<std::size_t, value>) const {
     return value;
   }
 };
@@ -47,21 +47,21 @@
 void compile_generator() {
   supported_simd128_ctor<int>(identity());
   not_supported_simd128_ctor<int>([](int i) { return float(i); });
-  not_supported_simd128_ctor<int>([](intptr_t i) { return (int*)(i); });
+  not_supported_simd128_ctor<int>([](std::intptr_t i) { return (int*)(i); });
   not_supported_simd128_ctor<int>([](int* i) { return i; });
 }
 
 struct limited_identity {
-  template <size_t value>
-  typename std::conditional<value <= 2, int32_t, int64_t>::type
-  operator()(std::integral_constant<size_t, value>) const {
+  template <std::size_t value>
+  typename std::conditional<value <= 2, std::int32_t, std::int64_t>::type
+  operator()(std::integral_constant<std::size_t, value>) const {
     return value;
   }
 };
 
 void compile_limited_identity() {
-  supported_simd128_ctor<int64_t>(limited_identity());
-  not_supported_simd128_ctor<int32_t>(limited_identity());
+  supported_simd128_ctor<std::int64_t>(limited_identity());
+  not_supported_simd128_ctor<std::int32_t>(limited_identity());
 }
 
 template <typename SimdType>
@@ -84,9 +84,9 @@
 
 int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
-  assert(ex::native_simd<int32_t>::size() >= 4);
-  test_generator<ex::native_simd<int32_t>>();
-  test_generator<ex::fixed_size_simd<int32_t, 4>>();
+  assert(ex::native_simd<std::int32_t>::size() >= 4);
+  test_generator<ex::native_simd<std::int32_t>>();
+  test_generator<ex::fixed_size_simd<std::int32_t, 4>>();
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/load.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/load.pass.cpp
index c4b352a..ff29e71 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/load.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.cons/load.pass.cpp
@@ -38,13 +38,13 @@
 
 void compile_load_ctor() {
   supported_native_simd_ctor<int>((int*)nullptr, ex::element_aligned_tag());
-  supported_native_simd_ctor<uint32_t>((int*)nullptr,
+  supported_native_simd_ctor<std::uint32_t>((int*)nullptr,
                                        ex::element_aligned_tag());
   supported_native_simd_ctor<double>((float*)nullptr,
                                      ex::element_aligned_tag());
-  supported_native_simd_ctor<uint16_t>((unsigned int*)nullptr,
+  supported_native_simd_ctor<std::uint16_t>((unsigned int*)nullptr,
                                        ex::element_aligned_tag());
-  supported_native_simd_ctor<uint32_t>((float*)nullptr,
+  supported_native_simd_ctor<std::uint32_t>((float*)nullptr,
                                        ex::element_aligned_tag());
 
   not_supported_native_simd_ctor<int>((int*)nullptr, int());
@@ -52,7 +52,7 @@
 
 template <typename SimdType>
 void test_load_ctor() {
-  alignas(32) int32_t buffer[] = {4, 3, 2, 1};
+  alignas(32) std::int32_t buffer[] = {4, 3, 2, 1};
   {
     SimdType a(buffer, ex::element_aligned_tag());
     assert(a[0] == 4);
@@ -110,11 +110,11 @@
 
 int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
-  assert(ex::native_simd<int32_t>::size() >= 4);
-  test_load_ctor<ex::native_simd<int32_t>>();
-  test_load_ctor<ex::fixed_size_simd<int32_t, 4>>();
-  test_converting_load_ctor<ex::native_simd<int32_t>>();
-  test_converting_load_ctor<ex::fixed_size_simd<int32_t, 4>>();
+  assert(ex::native_simd<std::int32_t>::size() >= 4);
+  test_load_ctor<ex::native_simd<std::int32_t>>();
+  test_load_ctor<ex::fixed_size_simd<std::int32_t, 4>>();
+  test_converting_load_ctor<ex::native_simd<std::int32_t>>();
+  test_converting_load_ctor<ex::fixed_size_simd<std::int32_t, 4>>();
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/load.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/load.pass.cpp
index a888117..c036d4f 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/load.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/load.pass.cpp
@@ -39,17 +39,17 @@
 
 void compile_load() {
   supported_load<int>((int*)nullptr, ex::element_aligned_tag());
-  supported_load<uint32_t>((int*)nullptr, ex::element_aligned_tag());
+  supported_load<std::uint32_t>((int*)nullptr, ex::element_aligned_tag());
   supported_load<double>((float*)nullptr, ex::element_aligned_tag());
-  supported_load<uint16_t>((unsigned int*)nullptr, ex::element_aligned_tag());
-  supported_load<uint32_t>((float*)nullptr, ex::element_aligned_tag());
+  supported_load<std::uint16_t>((unsigned int*)nullptr, ex::element_aligned_tag());
+  supported_load<std::uint32_t>((float*)nullptr, ex::element_aligned_tag());
 
   not_supported_load<int>((int*)nullptr, int());
 }
 
 template <typename SimdType>
 void test_load() {
-  alignas(32) int32_t buffer[] = {4, 3, 2, 1};
+  alignas(32) std::int32_t buffer[] = {4, 3, 2, 1};
   {
     SimdType a;
     a.copy_from(buffer, ex::element_aligned_tag());
@@ -114,11 +114,11 @@
 
 int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
-  assert(ex::native_simd<int32_t>::size() >= 4);
-  test_load<ex::native_simd<int32_t>>();
-  test_load<ex::fixed_size_simd<int32_t, 4>>();
-  test_converting_load<ex::native_simd<int32_t>>();
-  test_converting_load<ex::fixed_size_simd<int32_t, 4>>();
+  assert(ex::native_simd<std::int32_t>::size() >= 4);
+  test_load<ex::native_simd<std::int32_t>>();
+  test_load<ex::fixed_size_simd<std::int32_t, 4>>();
+  test_converting_load<ex::native_simd<std::int32_t>>();
+  test_converting_load<ex::fixed_size_simd<std::int32_t, 4>>();
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/store.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/store.pass.cpp
index d3ead60..932ecfc 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/store.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.mem/store.pass.cpp
@@ -25,7 +25,7 @@
 void test_store() {
   SimdType a([](int i) { return 4 - i; });
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::element_aligned_tag());
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -33,7 +33,7 @@
     assert(buffer[3] == 1);
   }
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::vector_aligned_tag());
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -41,7 +41,7 @@
     assert(buffer[3] == 1);
   }
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::overaligned_tag<32>());
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -50,7 +50,7 @@
   }
 
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::element_aligned);
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -58,7 +58,7 @@
     assert(buffer[3] == 1);
   }
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::vector_aligned);
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -66,7 +66,7 @@
     assert(buffer[3] == 1);
   }
   {
-    alignas(32) int32_t buffer[4] = {0};
+    alignas(32) std::int32_t buffer[4] = {0};
     a.copy_to(buffer, ex::overaligned<32>);
     assert(buffer[0] == 4);
     assert(buffer[1] == 3);
@@ -88,10 +88,10 @@
 
 int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
-  test_store<ex::native_simd<int32_t>>();
-  test_store<ex::fixed_size_simd<int32_t, 4>>();
-  test_converting_store<ex::native_simd<int32_t>>();
-  test_converting_store<ex::fixed_size_simd<int32_t, 4>>();
+  test_store<ex::native_simd<std::int32_t>>();
+  test_store<ex::fixed_size_simd<std::int32_t, 4>>();
+  test_converting_store<ex::native_simd<std::int32_t>>();
+  test_converting_store<ex::fixed_size_simd<std::int32_t, 4>>();
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
index cfe8167..4d0883b 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
@@ -23,25 +23,25 @@
 
 struct UserType {};
 
-static_assert(ex::is_abi_tag<ex::simd_abi::native<int8_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<int16_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<int32_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<int64_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<uint8_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<uint16_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<uint32_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::native<uint64_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::int8_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::int16_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::int32_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::int64_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::uint8_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::uint16_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::uint32_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::native<std::uint64_t>>::value, "");
 static_assert(ex::is_abi_tag<ex::simd_abi::native<float>>::value, "");
 static_assert(ex::is_abi_tag<ex::simd_abi::native<double>>::value, "");
 
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<int8_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<int16_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<int32_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<int64_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<uint8_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<uint16_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<uint32_t>>::value, "");
-static_assert(ex::is_abi_tag<ex::simd_abi::compatible<uint64_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::int8_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::int16_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::int32_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::int64_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::uint8_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::uint16_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::uint32_t>>::value, "");
+static_assert(ex::is_abi_tag<ex::simd_abi::compatible<std::uint64_t>>::value, "");
 static_assert(ex::is_abi_tag<ex::simd_abi::compatible<float>>::value, "");
 static_assert(ex::is_abi_tag<ex::simd_abi::compatible<double>>::value, "");
 
@@ -66,25 +66,25 @@
 static_assert(!ex::is_abi_tag<ex::simd_mask<int>>::value, "");
 static_assert(!ex::is_abi_tag<ex::simd_mask<float>>::value, "");
 
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<int8_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<int16_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<int32_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<int64_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<uint8_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<uint16_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<uint32_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::native<uint64_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::int8_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::int16_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::int32_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::int64_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::uint8_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::uint16_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::uint32_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::native<std::uint64_t>>, "");
 static_assert(ex::is_abi_tag_v<ex::simd_abi::native<float>>, "");
 static_assert(ex::is_abi_tag_v<ex::simd_abi::native<double>>, "");
 
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<int8_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<int16_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<int32_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<int64_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<uint8_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<uint16_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<uint32_t>>, "");
-static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<uint64_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::int8_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::int16_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::int32_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::int64_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::uint8_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::uint16_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::uint32_t>>, "");
+static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<std::uint64_t>>, "");
 static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<float>>, "");
 static_assert(ex::is_abi_tag_v<ex::simd_abi::compatible<double>>, "");
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
index 6c7449e..dc20adf 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
@@ -23,47 +23,47 @@
 
 struct UserType {};
 
-static_assert(ex::is_simd<ex::native_simd<int8_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<int16_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<int32_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<int64_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<uint8_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<uint16_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<uint32_t>>::value, "");
-static_assert(ex::is_simd<ex::native_simd<uint64_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::int8_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::int16_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::int32_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::int64_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::uint8_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::uint16_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::uint32_t>>::value, "");
+static_assert(ex::is_simd<ex::native_simd<std::uint64_t>>::value, "");
 static_assert(ex::is_simd<ex::native_simd<float>>::value, "");
 static_assert(ex::is_simd<ex::native_simd<double>>::value, "");
 
-static_assert(ex::is_simd<ex::fixed_size_simd<int8_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int16_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int32_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int64_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint8_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint16_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint32_t, 1>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint64_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int8_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int16_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int32_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int64_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint8_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint16_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint32_t, 1>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint64_t, 1>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<float, 1>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<double, 1>>::value, "");
 
-static_assert(ex::is_simd<ex::fixed_size_simd<int8_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int16_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int32_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int64_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint8_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint16_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint32_t, 3>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint64_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int8_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int16_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int32_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int64_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint8_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint16_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint32_t, 3>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint64_t, 3>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<float, 3>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<double, 3>>::value, "");
 
-static_assert(ex::is_simd<ex::fixed_size_simd<int8_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int16_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int32_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<int64_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint8_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint16_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint32_t, 32>>::value, "");
-static_assert(ex::is_simd<ex::fixed_size_simd<uint64_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int8_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int16_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int32_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::int64_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint8_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint16_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint32_t, 32>>::value, "");
+static_assert(ex::is_simd<ex::fixed_size_simd<std::uint64_t, 32>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<float, 32>>::value, "");
 static_assert(ex::is_simd<ex::fixed_size_simd<double, 32>>::value, "");
 
@@ -74,47 +74,47 @@
 static_assert(!ex::is_simd<ex::simd_mask<float>>::value, "");
 static_assert(!ex::is_simd<UserType>::value, "");
 
-static_assert(ex::is_simd_v<ex::native_simd<int8_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<int16_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<int32_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<int64_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<uint8_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<uint16_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<uint32_t>>, "");
-static_assert(ex::is_simd_v<ex::native_simd<uint64_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::int8_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::int16_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::int32_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::int64_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::uint8_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::uint16_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::uint32_t>>, "");
+static_assert(ex::is_simd_v<ex::native_simd<std::uint64_t>>, "");
 static_assert(ex::is_simd_v<ex::native_simd<float>>, "");
 static_assert(ex::is_simd_v<ex::native_simd<double>>, "");
 
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int8_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int16_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int32_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int64_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint8_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint16_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint32_t, 1>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint64_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int8_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int16_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int32_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int64_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint8_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint16_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint32_t, 1>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint64_t, 1>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<float, 1>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<double, 1>>, "");
 
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int8_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int16_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int32_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int64_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint8_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint16_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint32_t, 3>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint64_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int8_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int16_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int32_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int64_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint8_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint16_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint32_t, 3>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint64_t, 3>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<float, 3>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<double, 3>>, "");
 
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int8_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int16_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int32_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<int64_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint8_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint16_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint32_t, 32>>, "");
-static_assert(ex::is_simd_v<ex::fixed_size_simd<uint64_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int8_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int16_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int32_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::int64_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint8_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint16_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint32_t, 32>>, "");
+static_assert(ex::is_simd_v<ex::fixed_size_simd<std::uint64_t, 32>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<float, 32>>, "");
 static_assert(ex::is_simd_v<ex::fixed_size_simd<double, 32>>, "");
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
index 1e7b046..e174a7c 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
@@ -32,8 +32,8 @@
 static_assert(!ex::is_simd_flag_type<int>::value, "");
 static_assert(!ex::is_simd_flag_type<float>::value, "");
 static_assert(!ex::is_simd_flag_type<UserType>::value, "");
-static_assert(!ex::is_simd_flag_type<ex::simd<int8_t>>::value, "");
-static_assert(!ex::is_simd_flag_type<ex::simd_mask<int8_t>>::value, "");
+static_assert(!ex::is_simd_flag_type<ex::simd<std::int8_t>>::value, "");
+static_assert(!ex::is_simd_flag_type<ex::simd_mask<std::int8_t>>::value, "");
 
 static_assert(ex::is_simd_flag_type_v<ex::element_aligned_tag>, "");
 static_assert(ex::is_simd_flag_type_v<ex::vector_aligned_tag>, "");
@@ -44,8 +44,8 @@
 static_assert(!ex::is_simd_flag_type_v<int>, "");
 static_assert(!ex::is_simd_flag_type_v<float>, "");
 static_assert(!ex::is_simd_flag_type_v<UserType>, "");
-static_assert(!ex::is_simd_flag_type_v<ex::simd<int8_t>>, "");
-static_assert(!ex::is_simd_flag_type_v<ex::simd_mask<int8_t>>, "");
+static_assert(!ex::is_simd_flag_type_v<ex::simd<std::int8_t>>, "");
+static_assert(!ex::is_simd_flag_type_v<ex::simd_mask<std::int8_t>>, "");
 
 int main(int, char**) {
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
index a495af4..b9d6cf8 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
@@ -23,68 +23,68 @@
 
 struct UserType {};
 
-static_assert(ex::is_simd_mask<ex::native_simd_mask<int8_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<int16_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<int32_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<int64_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<uint8_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<uint16_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<uint32_t>>::value, "");
-static_assert(ex::is_simd_mask<ex::native_simd_mask<uint64_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::int8_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::int16_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::int32_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::int64_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::uint8_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::uint16_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::uint32_t>>::value, "");
+static_assert(ex::is_simd_mask<ex::native_simd_mask<std::uint64_t>>::value, "");
 static_assert(ex::is_simd_mask<ex::native_simd_mask<float>>::value, "");
 static_assert(ex::is_simd_mask<ex::native_simd_mask<double>>::value, "");
 
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int8_t, 1>>::value, "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int16_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int8_t, 1>>::value, "");
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int16_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int32_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int32_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int64_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int64_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint8_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint8_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint16_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint16_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint32_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint32_t, 1>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint64_t, 1>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint64_t, 1>>::value,
               "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<float, 1>>::value, "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<double, 1>>::value, "");
 
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int8_t, 3>>::value, "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int16_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int8_t, 3>>::value, "");
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int16_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int32_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int32_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int64_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int64_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint8_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint8_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint16_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint16_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint32_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint32_t, 3>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint64_t, 3>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint64_t, 3>>::value,
               "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<float, 3>>::value, "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<double, 3>>::value, "");
 
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int8_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int8_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int16_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int16_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int32_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int32_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<int64_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::int64_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint8_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint8_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint16_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint16_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint32_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint32_t, 32>>::value,
               "");
-static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<uint64_t, 32>>::value,
+static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<std::uint64_t, 32>>::value,
               "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<float, 32>>::value, "");
 static_assert(ex::is_simd_mask<ex::fixed_size_simd_mask<double, 32>>::value,
@@ -97,47 +97,47 @@
 static_assert(!ex::is_simd_mask<ex::simd<float>>::value, "");
 static_assert(!ex::is_simd_mask<UserType>::value, "");
 
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<int8_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<int16_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<int32_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<int64_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<uint8_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<uint16_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<uint32_t>>, "");
-static_assert(ex::is_simd_mask_v<ex::native_simd_mask<uint64_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::int8_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::int16_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::int32_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::int64_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::uint8_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::uint16_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::uint32_t>>, "");
+static_assert(ex::is_simd_mask_v<ex::native_simd_mask<std::uint64_t>>, "");
 static_assert(ex::is_simd_mask_v<ex::native_simd_mask<float>>, "");
 static_assert(ex::is_simd_mask_v<ex::native_simd_mask<double>>, "");
 
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int8_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int16_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int32_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int64_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint8_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint16_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint32_t, 1>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint64_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int8_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int16_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int32_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int64_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint8_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint16_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint32_t, 1>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint64_t, 1>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<float, 1>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<double, 1>>, "");
 
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int8_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int16_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int32_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int64_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint8_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint16_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint32_t, 3>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint64_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int8_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int16_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int32_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int64_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint8_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint16_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint32_t, 3>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint64_t, 3>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<float, 3>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<double, 3>>, "");
 
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int8_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int16_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int32_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<int64_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint8_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint16_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint32_t, 32>>, "");
-static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<uint64_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int8_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int16_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int32_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::int64_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint8_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint16_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint32_t, 32>>, "");
+static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<std::uint64_t, 32>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<float, 32>>, "");
 static_assert(ex::is_simd_mask_v<ex::fixed_size_simd_mask<double, 32>>, "");
 
diff --git a/third_party/llvm-project/libcxx/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
index 01db1a8..65208ff 100644
--- a/third_party/llvm-project/libcxx/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
@@ -24,7 +24,7 @@
 {
   typedef X first_argument_type;
 
-  size_t operator()(const first_argument_type&) const
+  std::size_t operator()(const first_argument_type&) const
   {
     return 99;
   }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
index 035dd1f..322787b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
index 835cce6..84c4197 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
index f75d115..e051099 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
index afaaa54..a055c66 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // FILE_DEPENDENCIES: test.dat
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
index 5a53c17..11f84c8 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // FILE_DEPENDENCIES: test.dat
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
index f8a6d28..700247d 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
index db7a267..f150cfa 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
index e3c240d..621c445 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
@@ -19,13 +19,10 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 #include "test_convertible.h"
 
-TEST_SUITE(directory_entry_path_ctor_suite)
-
-TEST_CASE(copy_ctor) {
+static void copy_ctor() {
   using namespace fs;
   // Copy
   {
@@ -42,7 +39,7 @@
   }
 }
 
-TEST_CASE(copy_ctor_copies_cache) {
+static void copy_ctor_copies_cache() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -55,8 +52,8 @@
     fs::remove(sym);
 
     directory_entry ent_cp(ent);
-    TEST_CHECK(ent_cp.path() == sym);
-    TEST_CHECK(ent_cp.is_symlink());
+    assert(ent_cp.path() == sym);
+    assert(ent_cp.is_symlink());
   }
 
   {
@@ -65,9 +62,14 @@
     fs::remove(file);
 
     directory_entry ent_cp(ent);
-    TEST_CHECK(ent_cp.path() == file);
-    TEST_CHECK(ent_cp.is_regular_file());
+    assert(ent_cp.path() == file);
+    assert(ent_cp.is_regular_file());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  copy_ctor();
+  copy_ctor_copies_cache();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
index 2b3dc83..6c551b5 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
@@ -22,12 +22,9 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
-TEST_SUITE(directory_entry_ctor_suite)
-
-TEST_CASE(test_copy_assign_operator) {
+static void test_copy_assign_operator() {
   using namespace fs;
   // Copy
   {
@@ -48,7 +45,7 @@
   }
 }
 
-TEST_CASE(copy_assign_copies_cache) {
+static void copy_assign_copies_cache() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -62,8 +59,8 @@
 
     directory_entry ent_cp;
     ent_cp = ent;
-    TEST_CHECK(ent_cp.path() == sym);
-    TEST_CHECK(ent_cp.is_symlink());
+    assert(ent_cp.path() == sym);
+    assert(ent_cp.is_symlink());
   }
 
   {
@@ -73,9 +70,14 @@
 
     directory_entry ent_cp;
     ent_cp = ent;
-    TEST_CHECK(ent_cp.path() == file);
-    TEST_CHECK(ent_cp.is_regular_file());
+    assert(ent_cp.path() == file);
+    assert(ent_cp.is_regular_file());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_copy_assign_operator();
+  copy_assign_copies_cache();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
index 4d59b42..05ebbc7 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
@@ -19,13 +19,10 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 #include "test_convertible.h"
 
-TEST_SUITE(directory_entry_path_ctor_suite)
-
-TEST_CASE(move_ctor) {
+static void move_ctor() {
   using namespace fs;
   // Move
   {
@@ -40,7 +37,7 @@
   }
 }
 
-TEST_CASE(move_ctor_copies_cache) {
+static void move_ctor_copies_cache() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -53,8 +50,8 @@
     fs::remove(sym);
 
     directory_entry ent_cp(std::move(ent));
-    TEST_CHECK(ent_cp.path() == sym);
-    TEST_CHECK(ent_cp.is_symlink());
+    assert(ent_cp.path() == sym);
+    assert(ent_cp.is_symlink());
   }
 
   {
@@ -63,9 +60,14 @@
     fs::remove(file);
 
     directory_entry ent_cp(std::move(ent));
-    TEST_CHECK(ent_cp.path() == file);
-    TEST_CHECK(ent_cp.is_regular_file());
+    assert(ent_cp.path() == file);
+    assert(ent_cp.is_regular_file());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  move_ctor();
+  move_ctor_copies_cache();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
index 945b294..6afb041 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
@@ -22,12 +22,9 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
-TEST_SUITE(directory_entry_ctor_suite)
-
-TEST_CASE(test_move_assign_operator) {
+static void test_move_assign_operator() {
   using namespace fs;
   // Copy
   {
@@ -44,7 +41,7 @@
   }
 }
 
-TEST_CASE(move_assign_copies_cache) {
+static void move_assign_copies_cache() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -58,8 +55,8 @@
 
     directory_entry ent_cp;
     ent_cp = std::move(ent);
-    TEST_CHECK(ent_cp.path() == sym);
-    TEST_CHECK(ent_cp.is_symlink());
+    assert(ent_cp.path() == sym);
+    assert(ent_cp.is_symlink());
   }
 
   {
@@ -69,9 +66,14 @@
 
     directory_entry ent_cp;
     ent_cp = std::move(ent);
-    TEST_CHECK(ent_cp.path() == file);
-    TEST_CHECK(ent_cp.is_regular_file());
+    assert(ent_cp.path() == file);
+    assert(ent_cp.is_regular_file());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_move_assign_operator();
+  move_assign_copies_cache();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
index 19148e7..a075781 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
@@ -19,14 +19,12 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 #include "test_convertible.h"
 
-TEST_SUITE(directory_entry_path_ctor_suite)
-
-TEST_CASE(path_ctor) {
+static void path_ctor() {
   using namespace fs;
   {
     static_assert(std::is_constructible<directory_entry, const path&>::value,
@@ -40,11 +38,11 @@
   {
     const path p("foo/bar/baz");
     const directory_entry e(p);
-    TEST_CHECK(e.path() == p);
+    assert(e.path() == p);
   }
 }
 
-TEST_CASE(path_ec_ctor) {
+static void path_ec_ctor() {
   static_test_env static_env;
   using namespace fs;
   {
@@ -62,19 +60,19 @@
   {
     std::error_code ec = GetTestEC();
     const directory_entry e(static_env.File, ec);
-    TEST_CHECK(e.path() == static_env.File);
-    TEST_CHECK(!ec);
+    assert(e.path() == static_env.File);
+    assert(!ec);
   }
   {
     const path p("foo/bar/baz");
     std::error_code ec = GetTestEC();
     const directory_entry e(p, ec);
-    TEST_CHECK(e.path() == p);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(e.path() == p);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
   }
 }
 
-TEST_CASE(path_ctor_calls_refresh) {
+static void path_ctor_calls_refresh() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -85,15 +83,15 @@
     directory_entry ent(file);
     std::error_code ec = GetTestEC();
     directory_entry ent_ec(file, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
 
     LIBCPP_ONLY(remove(file));
 
-    TEST_CHECK(ent.exists());
-    TEST_CHECK(ent_ec.exists());
+    assert(ent.exists());
+    assert(ent_ec.exists());
 
-    TEST_CHECK(ent.file_size() == 42);
-    TEST_CHECK(ent_ec.file_size() == 42);
+    assert(ent.file_size() == 42);
+    assert(ent_ec.file_size() == 42);
   }
 
   env.create_file("dir/file", 101);
@@ -102,23 +100,23 @@
     directory_entry ent(sym);
     std::error_code ec = GetTestEC();
     directory_entry ent_ec(sym, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
 
     LIBCPP_ONLY(remove(file));
     LIBCPP_ONLY(remove(sym));
 
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent_ec.is_symlink());
+    assert(ent.is_symlink());
+    assert(ent_ec.is_symlink());
 
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent_ec.is_regular_file());
+    assert(ent.is_regular_file());
+    assert(ent_ec.is_regular_file());
 
-    TEST_CHECK(ent.file_size() == 101);
-    TEST_CHECK(ent_ec.file_size() == 101);
+    assert(ent.file_size() == 101);
+    assert(ent_ec.file_size() == 101);
   }
 }
 
-TEST_CASE(path_ctor_dne) {
+static void path_ctor_dne() {
   using namespace fs;
 
   static_test_env static_env;
@@ -126,27 +124,27 @@
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(static_env.DNE, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
-    TEST_CHECK(ent.path() == static_env.DNE);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.path() == static_env.DNE);
   }
   // don't report dead symlinks as an error.
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(static_env.BadSymlink, ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ent.path() == static_env.BadSymlink);
+    assert(!ec);
+    assert(ent.path() == static_env.BadSymlink);
   }
   // DNE does not cause the constructor to throw
   {
     directory_entry ent(static_env.DNE);
-    TEST_CHECK(ent.path() == static_env.DNE);
+    assert(ent.path() == static_env.DNE);
 
     directory_entry ent_two(static_env.BadSymlink);
-    TEST_CHECK(ent_two.path() == static_env.BadSymlink);
+    assert(ent_two.path() == static_env.BadSymlink);
   }
 }
 
-TEST_CASE(path_ctor_cannot_resolve) {
+static void path_ctor_cannot_resolve() {
   using namespace fs;
 #ifdef _WIN32
   // Windows doesn't support setting perms::none to trigger failures
@@ -154,16 +152,16 @@
   // instead.
   const path dir = GetWindowsInaccessibleDir();
   if (dir.empty())
-    TEST_UNSUPPORTED();
+    return;
   const path file = dir / "file";
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(file, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
-    TEST_CHECK(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.path() == file);
   }
   {
-    TEST_CHECK_NO_THROW(directory_entry(file));
+    TEST_DOES_NOT_THROW(directory_entry(file));
   }
 #else
   scoped_test_env env;
@@ -177,27 +175,35 @@
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(file, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-    TEST_CHECK(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == file);
   }
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(sym_in_dir, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-    TEST_CHECK(ent.path() == sym_in_dir);
+    assert(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_in_dir);
   }
   {
     std::error_code ec = GetTestEC();
     directory_entry ent(sym_out_of_dir, ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ent.path() == sym_out_of_dir);
+    assert(!ec);
+    assert(ent.path() == sym_out_of_dir);
   }
   {
-    TEST_CHECK_NO_THROW(directory_entry(file));
-    TEST_CHECK_NO_THROW(directory_entry(sym_in_dir));
-    TEST_CHECK_NO_THROW(directory_entry(sym_out_of_dir));
+    TEST_DOES_NOT_THROW(directory_entry(file));
+    TEST_DOES_NOT_THROW(directory_entry(sym_in_dir));
+    TEST_DOES_NOT_THROW(directory_entry(sym_out_of_dir));
   }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  path_ctor();
+  path_ec_ctor();
+  path_ctor_calls_refresh();
+  path_ctor_dne();
+  path_ctor_cannot_resolve();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
index 1ab9a91..fe5dd80 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
@@ -22,12 +22,9 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
-TEST_SUITE(directory_entry_mods_suite)
-
-TEST_CASE(test_path_assign_method) {
+static void test_path_assign_method() {
   using namespace fs;
   const path p("foo/bar/baz");
   const path p2("abc");
@@ -39,15 +36,15 @@
                   "operation must not be noexcept");
   }
   {
-    TEST_CHECK(e.path() == p);
+    assert(e.path() == p);
     e.assign(p2);
-    TEST_CHECK(e.path() == p2 && e.path() != p);
+    assert(e.path() == p2 && e.path() != p);
     e.assign(p);
-    TEST_CHECK(e.path() == p && e.path() != p2);
+    assert(e.path() == p && e.path() != p2);
   }
 }
 
-TEST_CASE(test_path_assign_ec_method) {
+static void test_path_assign_ec_method() {
   using namespace fs;
   const path p("foo/bar/baz");
   const path p2("abc");
@@ -63,12 +60,12 @@
     directory_entry ent(p);
     std::error_code ec = GetTestEC();
     ent.assign(p2, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
-    TEST_CHECK(ent.path() == p2);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.path() == p2);
   }
 }
 
-TEST_CASE(test_assign_calls_refresh) {
+static void test_assign_calls_refresh() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -82,7 +79,7 @@
     // removing the file demonstrates that the values where cached previously.
     LIBCPP_ONLY(remove(file));
 
-    TEST_CHECK(ent.is_regular_file());
+    assert(ent.is_regular_file());
   }
   env.create_file("dir/file", 101);
   {
@@ -92,12 +89,12 @@
     LIBCPP_ONLY(remove(file));
     LIBCPP_ONLY(remove(sym));
 
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
   }
 }
 
-TEST_CASE(test_assign_propagates_error) {
+static void test_assign_propagates_error() {
   using namespace fs;
   scoped_test_env env;
 #ifdef _WIN32
@@ -106,7 +103,7 @@
   // instead.
   const path dir = GetWindowsInaccessibleDir();
   if (dir.empty())
-    TEST_UNSUPPORTED();
+    return;
   const path file = dir / "inaccessible_file";
   // We can't create files in the inaccessible directory, so this doesn't
   // test exactly the same as the code below.
@@ -115,7 +112,7 @@
     directory_entry ent;
     std::error_code ec = GetTestEC();
     ent.assign(file, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
   }
 #else
   const path dir = env.create_dir("dir");
@@ -130,21 +127,28 @@
     directory_entry ent;
     std::error_code ec = GetTestEC();
     ent.assign(file, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
   }
   {
     directory_entry ent;
     std::error_code ec = GetTestEC();
     ent.assign(sym_in_dir, ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
   }
 #endif
   {
     directory_entry ent;
     std::error_code ec = GetTestEC();
     ent.assign(sym_out_of_dir, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_path_assign_method();
+  test_path_assign_ec_method();
+  test_assign_calls_refresh();
+  test_assign_propagates_error();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
index 56fda26..9fa44eb 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -25,13 +25,11 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
-TEST_SUITE(directory_entry_mods_suite)
-
-TEST_CASE(test_refresh_method) {
+static void test_refresh_method() {
   using namespace fs;
   {
     directory_entry e;
@@ -43,11 +41,11 @@
   {
     directory_entry e;
     e.refresh();
-    TEST_CHECK(!e.exists());
+    assert(!e.exists());
   }
 }
 
-TEST_CASE(test_refresh_ec_method) {
+static void test_refresh_ec_method() {
   using namespace fs;
   {
     directory_entry e;
@@ -60,14 +58,14 @@
     directory_entry e;
     std::error_code ec = GetTestEC();
     e.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
   }
 }
 
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
-TEST_CASE(refresh_on_file_dne) {
+static void refresh_on_file_dne() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -79,36 +77,36 @@
   {
     directory_entry ent(file);
     remove(file);
-    TEST_CHECK(ent.exists());
+    assert(ent.exists());
 
     ent.refresh();
 
     permissions(dir, perms::none);
-    TEST_CHECK(!ent.exists());
+    assert(!ent.exists());
   }
   permissions(dir, old_perms);
   env.create_file("dir/file", 101);
   {
     directory_entry ent(file);
     remove(file);
-    TEST_CHECK(ent.exists());
+    assert(ent.exists());
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     permissions(dir, perms::none);
-    TEST_CHECK(!ent.exists());
+    assert(!ent.exists());
   }
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
 void remove_if_exists(const fs::path& p) {
   std::error_code ec;
   remove(p, ec);
 }
 
-TEST_CASE(refresh_on_bad_symlink) {
+static void refresh_on_bad_symlink() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -121,18 +119,18 @@
   {
     directory_entry ent(sym);
     LIBCPP_ONLY(remove(file));
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.exists());
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.exists());
 
     remove_if_exists(file);
     ent.refresh();
 
     LIBCPP_ONLY(permissions(dir, perms::none));
-    TEST_CHECK(ent.is_symlink());
+    assert(ent.is_symlink());
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-    TEST_CHECK(!ent.is_regular_file());
-    TEST_CHECK(!ent.exists());
+    assert(!ent.is_regular_file());
+    assert(!ent.exists());
 #endif
   }
   permissions(dir, old_perms);
@@ -140,19 +138,19 @@
   {
     directory_entry ent(sym);
     LIBCPP_ONLY(remove(file));
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.exists());
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.exists());
 
     remove_if_exists(file);
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(!ec); // we don't report bad symlinks as an error.
+    assert(!ec); // we don't report bad symlinks as an error.
 
     LIBCPP_ONLY(permissions(dir, perms::none));
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-    TEST_CHECK(!ent.exists());
+    assert(!ent.exists());
 #endif
   }
 }
@@ -160,7 +158,7 @@
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
-TEST_CASE(refresh_cannot_resolve) {
+static void refresh_cannot_resolve() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -174,50 +172,50 @@
     directory_entry ent(file);
     permissions(dir, perms::none);
 
-    TEST_CHECK(ent.is_regular_file());
+    assert(ent.is_regular_file());
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
 
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-    TEST_CHECK(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == file);
 
     ExceptionChecker Checker(file, std::errc::permission_denied,
                              "directory_entry::refresh");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.refresh());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.refresh());
   }
   permissions(dir, old_perms);
   {
     directory_entry ent(sym_in_dir);
     permissions(dir, perms::none);
-    TEST_CHECK(ent.is_symlink());
+    assert(ent.is_symlink());
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-    TEST_CHECK(ent.path() == sym_in_dir);
+    assert(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_in_dir);
 
     ExceptionChecker Checker(sym_in_dir, std::errc::permission_denied,
                              "directory_entry::refresh");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.refresh());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.refresh());
   }
   permissions(dir, old_perms);
   {
     directory_entry ent(sym_out_of_dir);
     permissions(dir, perms::none);
-    TEST_CHECK(ent.is_symlink());
+    assert(ent.is_symlink());
 
     // Failure to resolve the linked entity due to permissions is not
     // reported as an error.
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ent.is_symlink());
+    assert(!ec);
+    assert(ent.is_symlink());
 
     ec = GetTestEC();
-    TEST_CHECK(ent.exists(ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-    TEST_CHECK(ent.path() == sym_out_of_dir);
+    assert(ent.exists(ec) == false);
+    assert(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_out_of_dir);
   }
   permissions(dir, old_perms);
   {
@@ -228,14 +226,13 @@
     ((void)ent_file);
     ((void)ent_sym);
 
-    TEST_CHECK_THROW(filesystem_error, ent_file.refresh());
-    TEST_CHECK_THROW(filesystem_error, ent_sym.refresh());
-    TEST_CHECK_NO_THROW(ent_sym2);
+    TEST_THROWS_TYPE(filesystem_error, ent_file.refresh());
+    TEST_THROWS_TYPE(filesystem_error, ent_sym.refresh());
   }
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
-TEST_CASE(refresh_doesnt_throw_on_dne_but_reports_it) {
+static void refresh_doesnt_throw_on_dne_but_reports_it() {
   using namespace fs;
   scoped_test_env env;
 
@@ -244,47 +241,50 @@
 
   {
     directory_entry ent(file);
-    TEST_CHECK(ent.file_size() == 42);
+    assert(ent.file_size() == 42);
 
     remove(file);
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
-    TEST_CHECK_NO_THROW(ent.refresh());
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    TEST_DOES_NOT_THROW(ent.refresh());
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     // doesn't throw!
-    TEST_CHECK_THROW(filesystem_error, ent.file_size());
+    //
+    //
+    //
+    //TEST_THROWS_TYPE(filesystem_error, ent.file_size());
   }
   env.create_file("file1", 99);
   {
     directory_entry ent(sym);
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.file_size() == 99);
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.file_size() == 99);
 
     remove(file);
 
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
-    TEST_CHECK_THROW(filesystem_error, ent.file_size());
+    TEST_THROWS_TYPE(filesystem_error, ent.file_size());
   }
 }
 
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
-TEST_CASE(access_cache_after_refresh_fails) {
+static void access_cache_after_refresh_fails() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -297,64 +297,79 @@
 
 #define CHECK_ACCESS(func, expect)                                             \
   ec = GetTestEC();                                                            \
-  TEST_CHECK(ent.func(ec) == expect);                                          \
-  TEST_CHECK(ErrorIs(ec, std::errc::permission_denied))
+  assert(ent.func(ec) == expect);                                          \
+  assert(ErrorIs(ec, std::errc::permission_denied))
 
   // test file doesn't exist
   {
     directory_entry ent(file);
 
-    TEST_CHECK(!ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.exists());
+    assert(!ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.exists());
 
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     CHECK_ACCESS(exists, false);
     CHECK_ACCESS(is_symlink, false);
     CHECK_ACCESS(last_write_time, file_time_type::min());
-    CHECK_ACCESS(hard_link_count, uintmax_t(-1));
+    CHECK_ACCESS(hard_link_count, std::uintmax_t(-1));
   }
   permissions(dir, old_perms);
   {
     directory_entry ent(sym_in_dir);
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.exists());
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.exists());
 
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     CHECK_ACCESS(exists, false);
     CHECK_ACCESS(is_symlink, false);
     CHECK_ACCESS(last_write_time, file_time_type::min());
-    CHECK_ACCESS(hard_link_count, uintmax_t(-1));
+    CHECK_ACCESS(hard_link_count, std::uintmax_t(-1));
   }
   permissions(dir, old_perms);
   {
     directory_entry ent(sym);
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.exists());
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.exists());
 
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.refresh(ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ent.is_symlink());
+    assert(!ec);
+    assert(ent.is_symlink());
 
     CHECK_ACCESS(exists, false);
     CHECK_ACCESS(is_regular_file, false);
     CHECK_ACCESS(last_write_time, file_time_type::min());
-    CHECK_ACCESS(hard_link_count, uintmax_t(-1));
+    CHECK_ACCESS(hard_link_count, std::uintmax_t(-1));
   }
 #undef CHECK_ACCESS
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_refresh_method();
+  test_refresh_ec_method();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  refresh_on_file_dne();
+#endif
+  refresh_on_bad_symlink();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  refresh_cannot_resolve();
+#endif
+  refresh_doesnt_throw_on_dne_but_reports_it();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  access_cache_after_refresh_fails();
+#endif
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
index 564e0e2..1d0b975 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
@@ -22,12 +22,9 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
-TEST_SUITE(directory_entry_mods_suite)
-
-TEST_CASE(test_replace_filename_method) {
+static void test_replace_filename_method() {
   using namespace fs;
 
   {
@@ -44,13 +41,13 @@
     const path replace("bar.out");
     const path expect("/path/to/bar.out");
     directory_entry e(p);
-    TEST_CHECK(e.path() == p);
+    assert(e.path() == p);
     e.replace_filename(replace);
-    TEST_CHECK(e.path() == expect);
+    assert(e.path() == expect);
   }
 }
 
-TEST_CASE(test_replace_filename_ec_method) {
+static void test_replace_filename_ec_method() {
   using namespace fs;
 
   static_test_env static_env;
@@ -69,27 +66,27 @@
     const path replace("bar.out");
     const path expect("/path/to/bar.out");
     directory_entry e(p);
-    TEST_CHECK(e.path() == p);
+    assert(e.path() == p);
     std::error_code ec = GetTestEC();
     e.replace_filename(replace, ec);
-    TEST_CHECK(e.path() == expect);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(e.path() == expect);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
   }
   {
     const path p = static_env.EmptyFile;
     const path expect = static_env.NonEmptyFile;
     const path replace = static_env.NonEmptyFile.filename();
-    TEST_REQUIRE(expect.parent_path() == p.parent_path());
+    assert(expect.parent_path() == p.parent_path());
     directory_entry e(p);
-    TEST_CHECK(e.path() == p);
+    assert(e.path() == p);
     std::error_code ec = GetTestEC();
     e.replace_filename(replace, ec);
-    TEST_CHECK(e.path() == expect);
-    TEST_CHECK(!ec);
+    assert(e.path() == expect);
+    assert(!ec);
   }
 }
 
-TEST_CASE(test_replace_filename_calls_refresh) {
+static void test_replace_filename_calls_refresh() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -101,32 +98,32 @@
   {
     directory_entry ent(file);
     ent.replace_filename(file_two.filename());
-    TEST_REQUIRE(ent.path() == file_two);
+    assert(ent.path() == file_two);
 
     // removing the file demonstrates that the values where cached previously.
     LIBCPP_ONLY(remove(file_two));
 
-    TEST_CHECK(ent.file_size() == 101);
+    assert(ent.file_size() == 101);
   }
   env.create_file("dir/file_two", 99);
   {
     directory_entry ent(sym);
     ent.replace_filename(sym_two.filename());
-    TEST_REQUIRE(ent.path() == sym_two);
+    assert(ent.path() == sym_two);
 
     LIBCPP_ONLY(remove(file_two));
     LIBCPP_ONLY(remove(sym_two));
 
-    TEST_CHECK(ent.is_symlink());
-    TEST_CHECK(ent.is_regular_file());
-    TEST_CHECK(ent.file_size() == 99);
+    assert(ent.is_symlink());
+    assert(ent.is_regular_file());
+    assert(ent.file_size() == 99);
   }
 }
 
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
-TEST_CASE(test_replace_filename_propagates_error) {
+static void test_replace_filename_propagates_error() {
   using namespace fs;
   scoped_test_env env;
   const path dir = env.create_dir("dir");
@@ -145,7 +142,7 @@
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.replace_filename(file_two.filename(), ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
   }
   permissions(dir, old_perms);
   {
@@ -153,7 +150,7 @@
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.replace_filename(sym_in_dir_two.filename(), ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ErrorIs(ec, std::errc::permission_denied));
   }
   permissions(dir, old_perms);
   {
@@ -161,13 +158,22 @@
     permissions(dir, perms::none);
     std::error_code ec = GetTestEC();
     ent.replace_filename(sym_out_of_dir_two.filename(), ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ent.is_symlink());
+    assert(!ec);
+    assert(ent.is_symlink());
     ec = GetTestEC();
-    TEST_CHECK(!ent.exists(ec));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(!ent.exists(ec));
+    assert(ErrorIs(ec, std::errc::permission_denied));
   }
 }
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+
+int main(int, char**) {
+  test_replace_filename_method();
+  test_replace_filename_ec_method();
+  test_replace_filename_calls_refresh();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  test_replace_filename_propagates_error();
 #endif
 
-TEST_SUITE_END()
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
index c1e9130..fa105a7 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -23,27 +23,25 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_obs_testsuite)
-
-TEST_CASE(signatures) {
+static void signatures() {
   using namespace fs;
   {
     const fs::directory_entry e = {};
     std::error_code ec;
-    static_assert(std::is_same<decltype(e.file_size()), uintmax_t>::value, "");
-    static_assert(std::is_same<decltype(e.file_size(ec)), uintmax_t>::value,
+    static_assert(std::is_same<decltype(e.file_size()), std::uintmax_t>::value, "");
+    static_assert(std::is_same<decltype(e.file_size(ec)), std::uintmax_t>::value,
                   "");
     static_assert(noexcept(e.file_size()) == false, "");
     static_assert(noexcept(e.file_size(ec)) == true, "");
   }
 }
 
-TEST_CASE(basic) {
+static void basic() {
   using namespace fs;
 
   scoped_test_env env;
@@ -53,32 +51,32 @@
 
   {
     directory_entry ent(file);
-    uintmax_t expect = file_size(ent);
-    TEST_CHECK(expect == 42);
+    std::uintmax_t expect = file_size(ent);
+    assert(expect == 42);
 
     // Remove the file to show that the results were already in the cache.
     LIBCPP_ONLY(remove(file));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.file_size(ec) == expect);
+    assert(!ec);
   }
   env.create_file("file", 99);
   {
     directory_entry ent(sym);
 
-    uintmax_t expect = file_size(ent);
-    TEST_CHECK(expect == 99);
+    std::uintmax_t expect = file_size(ent);
+    assert(expect == 99);
 
     LIBCPP_ONLY(remove(ent));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == 99);
-    TEST_CHECK(!ec);
+    assert(ent.file_size(ec) == 99);
+    assert(!ec);
   }
 }
 
-TEST_CASE(not_regular_file) {
+static void not_regular_file() {
   using namespace fs;
 
   scoped_test_env env;
@@ -95,24 +93,24 @@
   for (auto const& TC : TestCases) {
     const path& p = TC.p;
     directory_entry ent(p);
-    TEST_CHECK(ent.path() == p);
+    assert(ent.path() == p);
     std::error_code ec = GetTestEC(0);
 
     std::error_code other_ec = GetTestEC(1);
-    uintmax_t expect = file_size(p, other_ec);
+    std::uintmax_t expect = file_size(p, other_ec);
 
-    uintmax_t got = ent.file_size(ec);
-    TEST_CHECK(got == expect);
-    TEST_CHECK(got == uintmax_t(-1));
-    TEST_CHECK(ec == other_ec);
-    TEST_CHECK(ErrorIs(ec, TC.expected_err));
+    std::uintmax_t got = ent.file_size(ec);
+    assert(got == expect);
+    assert(got == std::uintmax_t(-1));
+    assert(ec == other_ec);
+    assert(ErrorIs(ec, TC.expected_err));
 
     ExceptionChecker Checker(p, TC.expected_err, "directory_entry::file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
   }
 }
 
-TEST_CASE(error_reporting) {
+static void error_reporting() {
   using namespace fs;
 
   static_test_env static_env;
@@ -134,40 +132,40 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(static_env.DNE, ec);
-    TEST_REQUIRE(ent.path() == static_env.DNE);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.path() == static_env.DNE);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.DNE,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
   }
   // test a dead symlink
   {
     directory_entry ent;
 
     std::error_code ec = GetTestEC();
-    uintmax_t expect_bad = file_size(static_env.BadSymlink, ec);
-    TEST_CHECK(expect_bad == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    std::uintmax_t expect_bad = file_size(static_env.BadSymlink, ec);
+    assert(expect_bad == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
     ent.assign(static_env.BadSymlink, ec);
-    TEST_REQUIRE(ent.path() == static_env.BadSymlink);
-    TEST_CHECK(!ec);
+    assert(ent.path() == static_env.BadSymlink);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == expect_bad);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.file_size(ec) == expect_bad);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.BadSymlink,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
   }
   // Windows doesn't support setting perms::none to trigger failures
   // reading directories.
@@ -175,80 +173,87 @@
   // test a file w/o appropriate permissions.
   {
     directory_entry ent;
-    uintmax_t expect_good = file_size(file);
+    std::uintmax_t expect_good = file_size(file);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(file, ec);
-    TEST_REQUIRE(ent.path() == file);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(file, std::errc::permission_denied, "file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.file_size());
+    assert(ent.file_size(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.file_size());
   }
   permissions(dir, old_perms);
   // test a symlink w/o appropriate permissions.
   {
     directory_entry ent;
-    uintmax_t expect_good = file_size(sym_in_dir);
+    std::uintmax_t expect_good = file_size(sym_in_dir);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_in_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_in_dir);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_in_dir);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_in_dir, std::errc::permission_denied,
                              "file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.file_size());
+    assert(ent.file_size(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.file_size());
   }
   permissions(dir, old_perms);
   // test a symlink to a file w/o appropriate permissions
   {
     directory_entry ent;
-    uintmax_t expect_good = file_size(sym_out_of_dir);
+    std::uintmax_t expect_good = file_size(sym_out_of_dir);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_out_of_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_out_of_dir);
-    TEST_CHECK(!ec);
+    assert(ent.path() == sym_out_of_dir);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.file_size(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_out_of_dir, std::errc::permission_denied,
                              "file_size");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.file_size());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.file_size());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.file_size(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.file_size());
+    assert(ent.file_size(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.file_size());
   }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  signatures();
+  basic();
+  not_regular_file();
+  error_reporting();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
index 541a6d9..6591d51 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
@@ -20,18 +20,15 @@
 #include <cassert>
 
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_obs_testsuite)
-
-TEST_CASE(file_dne) {
+static void file_dne() {
   using namespace fs;
   directory_entry p("dne");
 }
 
-TEST_CASE(signatures) {
+static void signatures() {
   using namespace fs;
   const directory_entry e = {};
   std::error_code ec;
@@ -56,7 +53,7 @@
 #undef TEST_FUNC
 }
 
-TEST_CASE(test_without_ec) {
+static void test_without_ec() {
   using namespace fs;
   using fs::directory_entry;
   using fs::file_status;
@@ -71,17 +68,17 @@
     file_status st = status(p);
     file_status sym_st = symlink_status(p);
     fs::remove(p);
-    TEST_REQUIRE(e.exists());
-    TEST_REQUIRE(!exists(p));
-    TEST_CHECK(e.exists() == exists(st));
-    TEST_CHECK(e.is_block_file() == is_block_file(st));
-    TEST_CHECK(e.is_character_file() == is_character_file(st));
-    TEST_CHECK(e.is_directory() == is_directory(st));
-    TEST_CHECK(e.is_fifo() == is_fifo(st));
-    TEST_CHECK(e.is_other() == is_other(st));
-    TEST_CHECK(e.is_regular_file() == is_regular_file(st));
-    TEST_CHECK(e.is_socket() == is_socket(st));
-    TEST_CHECK(e.is_symlink() == is_symlink(sym_st));
+    assert(e.exists());
+    assert(!exists(p));
+    assert(e.exists() == exists(st));
+    assert(e.is_block_file() == is_block_file(st));
+    assert(e.is_character_file() == is_character_file(st));
+    assert(e.is_directory() == is_directory(st));
+    assert(e.is_fifo() == is_fifo(st));
+    assert(e.is_other() == is_other(st));
+    assert(e.is_regular_file() == is_regular_file(st));
+    assert(e.is_socket() == is_socket(st));
+    assert(e.is_symlink() == is_symlink(sym_st));
   };
   test_path(f);
   test_path(d);
@@ -92,7 +89,7 @@
 #endif
 }
 
-TEST_CASE(test_with_ec) {
+static void test_with_ec() {
   using namespace fs;
   using fs::directory_entry;
   using fs::file_status;
@@ -116,36 +113,36 @@
       return res;
     };
 
-    TEST_REQUIRE(e.exists(ec));
-    TEST_CHECK(CheckEC(status_ec));
-    TEST_REQUIRE(!exists(p));
+    assert(e.exists(ec));
+    assert(CheckEC(status_ec));
+    assert(!exists(p));
 
-    TEST_CHECK(e.exists(ec) == exists(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.exists(ec) == exists(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_block_file(ec) == is_block_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_block_file(ec) == is_block_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_character_file(ec) == is_character_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_character_file(ec) == is_character_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_directory(ec) == is_directory(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_directory(ec) == is_directory(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_fifo(ec) == is_fifo(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_fifo(ec) == is_fifo(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_other(ec) == is_other(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_other(ec) == is_other(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_regular_file(ec) == is_regular_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_regular_file(ec) == is_regular_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_socket(ec) == is_socket(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_socket(ec) == is_socket(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_symlink(ec) == is_symlink(sym_st));
-    TEST_CHECK(CheckEC(sym_status_ec));
+    assert(e.is_symlink(ec) == is_symlink(sym_st));
+    assert(CheckEC(sym_status_ec));
   };
   test_path(f);
   test_path(d);
@@ -156,7 +153,7 @@
 #endif
 }
 
-TEST_CASE(test_with_ec_dne) {
+static void test_with_ec_dne() {
   using namespace fs;
   using fs::directory_entry;
   using fs::file_status;
@@ -176,39 +173,39 @@
       return res;
     };
 
-    TEST_CHECK(e.exists(ec) == exists(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.exists(ec) == exists(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_block_file(ec) == is_block_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_block_file(ec) == is_block_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_character_file(ec) == is_character_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_character_file(ec) == is_character_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_directory(ec) == is_directory(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_directory(ec) == is_directory(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_fifo(ec) == is_fifo(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_fifo(ec) == is_fifo(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_other(ec) == is_other(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_other(ec) == is_other(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_regular_file(ec) == is_regular_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_regular_file(ec) == is_regular_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_socket(ec) == is_socket(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_socket(ec) == is_socket(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_symlink(ec) == is_symlink(sym_st));
-    TEST_CHECK(CheckEC(sym_status_ec));
+    assert(e.is_symlink(ec) == is_symlink(sym_st));
+    assert(CheckEC(sym_status_ec));
   }
 }
 
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
-TEST_CASE(test_with_ec_cannot_resolve) {
+static void test_with_ec_cannot_resolve() {
   using namespace fs;
   using fs::directory_entry;
   using fs::file_status;
@@ -229,7 +226,7 @@
     permissions(dir, perms::none);
     std::error_code dummy_ec;
     e.refresh(dummy_ec);
-    TEST_REQUIRE(dummy_ec);
+    assert(dummy_ec);
 
     std::error_code status_ec = GetTestEC();
     std::error_code sym_status_ec = GetTestEC(1);
@@ -242,34 +239,45 @@
       return res;
     };
 
-    TEST_CHECK(e.exists(ec) == exists(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.exists(ec) == exists(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_block_file(ec) == is_block_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_block_file(ec) == is_block_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_character_file(ec) == is_character_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_character_file(ec) == is_character_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_directory(ec) == is_directory(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_directory(ec) == is_directory(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_fifo(ec) == is_fifo(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_fifo(ec) == is_fifo(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_other(ec) == is_other(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_other(ec) == is_other(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_regular_file(ec) == is_regular_file(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_regular_file(ec) == is_regular_file(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_socket(ec) == is_socket(st));
-    TEST_CHECK(CheckEC(status_ec));
+    assert(e.is_socket(ec) == is_socket(st));
+    assert(CheckEC(status_ec));
 
-    TEST_CHECK(e.is_symlink(ec) == is_symlink(sym_st));
-    TEST_CHECK(CheckEC(sym_status_ec));
+    assert(e.is_symlink(ec) == is_symlink(sym_st));
+    assert(CheckEC(sym_status_ec));
   }
 }
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+
+int main(int, char**) {
+  file_dne();
+  signatures();
+  test_without_ec();
+  test_with_ec();
+  test_with_ec_dne();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  test_with_ec_cannot_resolve();
 #endif
 
-TEST_SUITE_END()
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
index bd31668..e8c4742 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -23,27 +23,25 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_obs_testsuite)
-
-TEST_CASE(signatures) {
+static void signatures() {
   using namespace fs;
   {
     const directory_entry e = {};
     std::error_code ec;
-    static_assert(std::is_same<decltype(e.hard_link_count()), uintmax_t>::value, "");
-    static_assert(std::is_same<decltype(e.hard_link_count(ec)), uintmax_t>::value,
+    static_assert(std::is_same<decltype(e.hard_link_count()), std::uintmax_t>::value, "");
+    static_assert(std::is_same<decltype(e.hard_link_count(ec)), std::uintmax_t>::value,
                   "");
     static_assert(noexcept(e.hard_link_count()) == false, "");
     static_assert(noexcept(e.hard_link_count(ec)) == true, "");
   }
 }
 
-TEST_CASE(basic) {
+static void basic() {
   using namespace fs;
 
   scoped_test_env env;
@@ -53,36 +51,36 @@
 
   {
     directory_entry ent(file);
-    uintmax_t expect = hard_link_count(ent);
+    std::uintmax_t expect = hard_link_count(ent);
 
     // Remove the file to show that the results were already in the cache.
     LIBCPP_ONLY(remove(file));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.hard_link_count(ec) == expect);
+    assert(!ec);
   }
   {
     directory_entry ent(dir);
-    uintmax_t expect = hard_link_count(ent);
+    std::uintmax_t expect = hard_link_count(ent);
 
     LIBCPP_ONLY(remove(dir));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.hard_link_count(ec) == expect);
+    assert(!ec);
   }
   env.create_file("file", 99);
   env.create_hardlink("file", "hl");
   {
     directory_entry ent(sym);
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == 2);
-    TEST_CHECK(!ec);
+    assert(ent.hard_link_count(ec) == 2);
+    assert(!ec);
   }
 }
 
-TEST_CASE(not_regular_file) {
+static void not_regular_file() {
   using namespace fs;
 
   scoped_test_env env;
@@ -94,16 +92,16 @@
   auto test_path = [=](const path &p) {
     std::error_code dummy_ec = GetTestEC();
     directory_entry ent(p, dummy_ec);
-    TEST_CHECK(!dummy_ec);
+    assert(!dummy_ec);
 
-    uintmax_t expect = hard_link_count(p);
+    std::uintmax_t expect = hard_link_count(p);
 
     LIBCPP_ONLY(permissions(dir, perms::none));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.hard_link_count());
+    assert(ent.hard_link_count(ec) == expect);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.hard_link_count());
     permissions(dir, old_perms);
   };
   test_path(dir2);
@@ -115,7 +113,7 @@
 #endif
 }
 
-TEST_CASE(error_reporting) {
+static void error_reporting() {
   using namespace fs;
 
   static_test_env static_env;
@@ -137,41 +135,41 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(static_env.DNE, ec);
-    TEST_CHECK(ec);
-    TEST_REQUIRE(ent.path() == static_env.DNE);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ec);
+    assert(ent.path() == static_env.DNE);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.hard_link_count(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.DNE,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::hard_link_count");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.hard_link_count());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.hard_link_count());
   }
   // test a dead symlink
   {
     directory_entry ent;
 
     std::error_code ec = GetTestEC();
-    uintmax_t expect_bad = hard_link_count(static_env.BadSymlink, ec);
-    TEST_CHECK(expect_bad == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    std::uintmax_t expect_bad = hard_link_count(static_env.BadSymlink, ec);
+    assert(expect_bad == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
     ent.assign(static_env.BadSymlink, ec);
-    TEST_REQUIRE(ent.path() == static_env.BadSymlink);
-    TEST_CHECK(!ec);
+    assert(ent.path() == static_env.BadSymlink);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect_bad);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.hard_link_count(ec) == expect_bad);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.BadSymlink,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::hard_link_count");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.hard_link_count());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.hard_link_count());
   }
   // Windows doesn't support setting perms::none to trigger failures
   // reading directories.
@@ -179,81 +177,87 @@
   // test a file w/o appropriate permissions.
   {
     directory_entry ent;
-    uintmax_t expect_good = hard_link_count(file);
+    std::uintmax_t expect_good = hard_link_count(file);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(file, ec);
-    TEST_REQUIRE(ent.path() == file);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.hard_link_count(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(file, std::errc::permission_denied,
                              "hard_link_count");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.hard_link_count());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.hard_link_count());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.hard_link_count());
+    assert(ent.hard_link_count(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.hard_link_count());
   }
   permissions(dir, old_perms);
   // test a symlink w/o appropriate permissions.
   {
     directory_entry ent;
-    uintmax_t expect_good = hard_link_count(sym_in_dir);
+    std::uintmax_t expect_good = hard_link_count(sym_in_dir);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_in_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_in_dir);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_in_dir);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.hard_link_count(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_in_dir, std::errc::permission_denied,
                              "hard_link_count");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.hard_link_count());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.hard_link_count());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.hard_link_count());
+    assert(ent.hard_link_count(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.hard_link_count());
   }
   permissions(dir, old_perms);
   // test a symlink to a file w/o appropriate permissions
   {
     directory_entry ent;
-    uintmax_t expect_good = hard_link_count(sym_out_of_dir);
+    std::uintmax_t expect_good = hard_link_count(sym_out_of_dir);
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_out_of_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_out_of_dir);
-    TEST_CHECK(!ec);
+    assert(ent.path() == sym_out_of_dir);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == uintmax_t(-1));
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.hard_link_count(ec) == std::uintmax_t(-1));
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_out_of_dir, std::errc::permission_denied,
                              "hard_link_count");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.hard_link_count());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.hard_link_count());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.hard_link_count(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.hard_link_count());
+    assert(ent.hard_link_count(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.hard_link_count());
   }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  signatures();
+  basic();
+  not_regular_file();
+  error_reporting();
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
index dc0a1f7..f5e803f 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -23,14 +23,12 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_obs_testsuite)
-
-TEST_CASE(signatures) {
+static void signatures() {
   using namespace fs;
   {
     const fs::directory_entry e = {};
@@ -44,7 +42,7 @@
   }
 }
 
-TEST_CASE(basic) {
+static void basic() {
   using namespace fs;
 
   scoped_test_env env;
@@ -60,8 +58,8 @@
     LIBCPP_ONLY(remove(file));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.last_write_time(ec) == expect);
+    assert(!ec);
   }
   {
     directory_entry ent(dir);
@@ -70,8 +68,8 @@
     LIBCPP_ONLY(remove(dir));
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.last_write_time(ec) == expect);
+    assert(!ec);
   }
   env.create_file("file", 99);
   {
@@ -79,12 +77,12 @@
     file_time_type expect = last_write_time(sym);
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect);
-    TEST_CHECK(!ec);
+    assert(ent.last_write_time(ec) == expect);
+    assert(!ec);
   }
 }
 
-TEST_CASE(error_reporting) {
+static void error_reporting() {
   using namespace fs;
 
   static_test_env static_env;
@@ -106,17 +104,17 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(static_env.DNE, ec);
-    TEST_REQUIRE(ent.path() == static_env.DNE);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.path() == static_env.DNE);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.last_write_time(ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.DNE,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.last_write_time());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.last_write_time());
   }
   // test a dead symlink
   {
@@ -124,22 +122,22 @@
 
     std::error_code ec = GetTestEC();
     file_time_type expect_bad = last_write_time(static_env.BadSymlink, ec);
-    TEST_CHECK(expect_bad == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(expect_bad == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ec = GetTestEC();
     ent.assign(static_env.BadSymlink, ec);
-    TEST_REQUIRE(ent.path() == static_env.BadSymlink);
-    TEST_CHECK(!ec);
+    assert(ent.path() == static_env.BadSymlink);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect_bad);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(ent.last_write_time(ec) == expect_bad);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 
     ExceptionChecker Checker(static_env.BadSymlink,
                              std::errc::no_such_file_or_directory,
                              "directory_entry::last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.last_write_time());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.last_write_time());
   }
   // Windows doesn't support setting perms::none to trigger failures
   // reading directories.
@@ -152,22 +150,22 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(file, ec);
-    TEST_REQUIRE(ent.path() == file);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == file);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.last_write_time(ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(file, std::errc::permission_denied,
                              "last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.last_write_time());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.last_write_time());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.last_write_time());
+    assert(ent.last_write_time(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.last_write_time());
   }
   permissions(dir, old_perms);
   // test a symlink w/o appropriate permissions.
@@ -178,22 +176,22 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_in_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_in_dir);
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.path() == sym_in_dir);
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.last_write_time(ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_in_dir, std::errc::permission_denied,
                              "last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.last_write_time());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.last_write_time());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.last_write_time());
+    assert(ent.last_write_time(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.last_write_time());
   }
   permissions(dir, old_perms);
   // test a symlink to a file w/o appropriate permissions
@@ -204,24 +202,30 @@
 
     std::error_code ec = GetTestEC();
     ent.assign(sym_out_of_dir, ec);
-    TEST_REQUIRE(ent.path() == sym_out_of_dir);
-    TEST_CHECK(!ec);
+    assert(ent.path() == sym_out_of_dir);
+    assert(!ec);
 
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(ent.last_write_time(ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(sym_out_of_dir, std::errc::permission_denied,
                              "last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ent.last_write_time());
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ent.last_write_time());
 
     permissions(dir, old_perms);
     ec = GetTestEC();
-    TEST_CHECK(ent.last_write_time(ec) == expect_good);
-    TEST_CHECK(!ec);
-    TEST_CHECK_NO_THROW(ent.last_write_time());
+    assert(ent.last_write_time(ec) == expect_good);
+    assert(!ec);
+    TEST_DOES_NOT_THROW(ent.last_write_time());
   }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  signatures();
+  basic();
+  error_reporting();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
index ce4f286..7a45d60 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
@@ -20,13 +20,10 @@
 #include <cassert>
 
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_status_testsuite)
-
-TEST_CASE(test_basic) {
+static void test_basic() {
   using namespace fs;
   static_test_env static_env;
   {
@@ -44,17 +41,21 @@
     std::error_code pec = GetTestEC(), eec = GetTestEC(1);
     file_status ps = fs::status(p, pec);
     file_status es = e.status(eec);
-    TEST_CHECK(ps.type() == es.type());
-    TEST_CHECK(ps.permissions() == es.permissions());
-    TEST_CHECK(pec == eec);
+    assert(ps.type() == es.type());
+    assert(ps.permissions() == es.permissions());
+    assert(pec == eec);
   }
   for (const auto& p : TestCases) {
     const directory_entry e(p);
     file_status ps = fs::status(p);
     file_status es = e.status();
-    TEST_CHECK(ps.type() == es.type());
-    TEST_CHECK(ps.permissions() == es.permissions());
+    assert(ps.type() == es.type());
+    assert(ps.permissions() == es.permissions());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_basic();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
index 364b832..7fc5d3c 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
@@ -20,13 +20,10 @@
 #include <cassert>
 
 #include "filesystem_test_helper.h"
-#include "rapid-cxx-test.h"
 
 #include "test_macros.h"
 
-TEST_SUITE(directory_entry_obs_suite)
-
-TEST_CASE(test_signature) {
+static void test_signature() {
   using namespace fs;
   static_test_env static_env;
   {
@@ -44,17 +41,20 @@
     std::error_code pec = GetTestEC(), eec = GetTestEC(1);
     file_status ps = fs::symlink_status(p, pec);
     file_status es = e.symlink_status(eec);
-    TEST_CHECK(ps.type() == es.type());
-    TEST_CHECK(ps.permissions() == es.permissions());
-    TEST_CHECK(pec == eec);
+    assert(ps.type() == es.type());
+    assert(ps.permissions() == es.permissions());
+    assert(pec == eec);
   }
   for (const auto& p : TestCases) {
     const directory_entry e(p);
     file_status ps = fs::symlink_status(p);
     file_status es = e.symlink_status();
-    TEST_CHECK(ps.type() == es.type());
-    TEST_CHECK(ps.permissions() == es.permissions());
+    assert(ps.type() == es.type());
+    assert(ps.permissions() == es.permissions());
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_signature();
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
index 47041cb..d37053a 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
@@ -20,40 +20,43 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_copy_construct_tests)
-
-TEST_CASE(test_constructor_signature)
+static void test_constructor_signature()
 {
     using D = directory_iterator;
     static_assert(std::is_copy_constructible<D>::value, "");
 }
 
-TEST_CASE(test_copy_end_iterator)
+static void test_copy_end_iterator()
 {
     const directory_iterator endIt;
     directory_iterator it(endIt);
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_copy_valid_iterator)
+static void test_copy_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
     const directory_iterator endIt{};
 
     const directory_iterator it(testDir);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     const path entry = *it;
 
     const directory_iterator it2(it);
-    TEST_REQUIRE(it2 == it);
-    TEST_CHECK(*it2 == entry);
-    TEST_CHECK(*it == entry);
+    assert(it2 == it);
+    assert(*it2 == entry);
+    assert(*it == entry);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_constructor_signature();
+    test_copy_end_iterator();
+    test_copy_valid_iterator();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
index e6f6d16..c1f96e1 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
@@ -20,37 +20,34 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_copy_assign_tests)
-
-TEST_CASE(test_assignment_signature)
+static void test_assignment_signature()
 {
     using D = directory_iterator;
     static_assert(std::is_copy_assignable<D>::value, "");
 }
 
-TEST_CASE(test_copy_to_end_iterator)
+static void test_copy_to_end_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
 
     const directory_iterator from(testDir);
-    TEST_REQUIRE(from != directory_iterator{});
+    assert(from != directory_iterator{});
     const path entry = *from;
 
     directory_iterator to{};
     to = from;
-    TEST_REQUIRE(to == from);
-    TEST_CHECK(*to == entry);
-    TEST_CHECK(*from == entry);
+    assert(to == from);
+    assert(*to == entry);
+    assert(*from == entry);
 }
 
 
-TEST_CASE(test_copy_from_end_iterator)
+static void test_copy_from_end_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -58,14 +55,14 @@
     const directory_iterator from{};
 
     directory_iterator to(testDir);
-    TEST_REQUIRE(to != directory_iterator{});
+    assert(to != directory_iterator{});
 
     to = from;
-    TEST_REQUIRE(to == from);
-    TEST_CHECK(to == directory_iterator{});
+    assert(to == from);
+    assert(to == directory_iterator{});
 }
 
-TEST_CASE(test_copy_valid_iterator)
+static void test_copy_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -73,28 +70,35 @@
 
     directory_iterator it_obj(testDir);
     const directory_iterator& it = it_obj;
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     ++it_obj;
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     const path entry = *it;
 
     directory_iterator it2(testDir);
-    TEST_REQUIRE(it2 != it);
+    assert(it2 != it);
     const path entry2 = *it2;
-    TEST_CHECK(entry2 != entry);
+    assert(entry2 != entry);
 
     it2 = it;
-    TEST_REQUIRE(it2 == it);
-    TEST_CHECK(*it2 == entry);
+    assert(it2 == it);
+    assert(*it2 == entry);
 }
 
-TEST_CASE(test_returns_reference_to_self)
+static void test_returns_reference_to_self()
 {
     const directory_iterator it;
     directory_iterator it2;
     directory_iterator& ref = (it2 = it);
-    TEST_CHECK(&ref == &it2);
+    assert(&ref == &it2);
 }
 
+int main(int, char**) {
+    test_assignment_signature();
+    test_copy_to_end_iterator();
+    test_copy_from_end_iterator();
+    test_copy_valid_iterator();
+    test_returns_reference_to_self();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
index 4ab9a2d..67a0703 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
@@ -22,15 +22,13 @@
 #include <set>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_constructor_tests)
-
-TEST_CASE(test_constructor_signatures)
+static void test_constructor_signatures()
 {
     using D = directory_iterator;
 
@@ -57,7 +55,7 @@
 
 }
 
-TEST_CASE(test_construction_from_bad_path)
+static void test_construction_from_bad_path()
 {
     static_test_env static_env;
     std::error_code ec;
@@ -69,22 +67,22 @@
     {
         {
             directory_iterator it(testPath, ec);
-            TEST_CHECK(ec);
-            TEST_CHECK(it == endIt);
+            assert(ec);
+            assert(it == endIt);
         }
         {
             directory_iterator it(testPath, opts, ec);
-            TEST_CHECK(ec);
-            TEST_CHECK(it == endIt);
+            assert(ec);
+            assert(it == endIt);
         }
         {
-            TEST_CHECK_THROW(filesystem_error, directory_iterator(testPath));
-            TEST_CHECK_THROW(filesystem_error, directory_iterator(testPath, opts));
+            TEST_THROWS_TYPE(filesystem_error, directory_iterator(testPath));
+            TEST_THROWS_TYPE(filesystem_error, directory_iterator(testPath, opts));
         }
     }
 }
 
-TEST_CASE(access_denied_test_case)
+static void access_denied_test_case()
 {
     using namespace fs;
 #ifdef _WIN32
@@ -93,7 +91,7 @@
     // instead.
     const path testDir = GetWindowsInaccessibleDir();
     if (testDir.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     scoped_test_env env;
     path const testDir = env.make_env_path("dir1");
@@ -104,7 +102,7 @@
     // Test that we can iterator over the directory before changing the perms
     {
         directory_iterator it(testDir);
-        TEST_REQUIRE(it != directory_iterator{});
+        assert(it != directory_iterator{});
     }
     // Change the permissions so we can no longer iterate
     permissions(testDir, perms::none);
@@ -115,21 +113,21 @@
     {
         std::error_code ec;
         directory_iterator it(testDir, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == directory_iterator{});
+        assert(ec);
+        assert(it == directory_iterator{});
     }
     // Check that construction does not report an error when
     // 'skip_permissions_denied' is given.
     {
         std::error_code ec;
         directory_iterator it(testDir, directory_options::skip_permission_denied, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it == directory_iterator{});
+        assert(!ec);
+        assert(it == directory_iterator{});
     }
 }
 
 
-TEST_CASE(access_denied_to_file_test_case)
+static void access_denied_to_file_test_case()
 {
     using namespace fs;
     scoped_test_env env;
@@ -144,20 +142,20 @@
     {
         std::error_code ec;
         directory_iterator it(testFile, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == directory_iterator{});
+        assert(ec);
+        assert(it == directory_iterator{});
     }
     // Check that construction still fails when 'skip_permissions_denied' is given
     // because we tried to open a file and not a directory.
     {
         std::error_code ec;
         directory_iterator it(testFile, directory_options::skip_permission_denied, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == directory_iterator{});
+        assert(ec);
+        assert(it == directory_iterator{});
     }
 }
 
-TEST_CASE(test_open_on_empty_directory_equals_end)
+static void test_open_on_empty_directory_equals_end()
 {
     scoped_test_env env;
     const path testDir = env.make_env_path("dir1");
@@ -167,16 +165,16 @@
     {
         std::error_code ec;
         directory_iterator it(testDir, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(it == endIt);
+        assert(!ec);
+        assert(it == endIt);
     }
     {
         directory_iterator it(testDir);
-        TEST_CHECK(it == endIt);
+        assert(it == endIt);
     }
 }
 
-TEST_CASE(test_open_on_directory_succeeds)
+static void test_open_on_directory_succeeds()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -187,18 +185,18 @@
     {
         std::error_code ec;
         directory_iterator it(testDir, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it != endIt);
-        TEST_CHECK(dir_contents.count(*it));
+        assert(!ec);
+        assert(it != endIt);
+        assert(dir_contents.count(*it));
     }
     {
         directory_iterator it(testDir);
-        TEST_CHECK(it != endIt);
-        TEST_CHECK(dir_contents.count(*it));
+        assert(it != endIt);
+        assert(dir_contents.count(*it));
     }
 }
 
-TEST_CASE(test_open_on_file_fails)
+static void test_open_on_file_fails()
 {
     static_test_env static_env;
     const path testFile = static_env.File;
@@ -206,35 +204,35 @@
     {
         std::error_code ec;
         directory_iterator it(testFile, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == endIt);
+        assert(ec);
+        assert(it == endIt);
     }
     {
-        TEST_CHECK_THROW(filesystem_error, directory_iterator(testFile));
+        TEST_THROWS_TYPE(filesystem_error, directory_iterator(testFile));
     }
 }
 
-TEST_CASE(test_open_on_empty_string)
+static void test_open_on_empty_string()
 {
     const path testPath = "";
     const directory_iterator endIt{};
 
     std::error_code ec;
     directory_iterator it(testPath, ec);
-    TEST_CHECK(ec);
-    TEST_CHECK(it == endIt);
+    assert(ec);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_open_on_dot_dir)
+static void test_open_on_dot_dir()
 {
     const path testPath = ".";
 
     std::error_code ec;
     directory_iterator it(testPath, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
 }
 
-TEST_CASE(test_open_on_symlink)
+static void test_open_on_symlink()
 {
     static_test_env static_env;
     const path symlinkToDir = static_env.SymlinkToDir;
@@ -247,20 +245,33 @@
     {
         std::error_code ec;
         directory_iterator it(symlinkToDir, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it != endIt);
+        assert(!ec);
+        assert(it != endIt);
         path const& entry = *it;
-        TEST_CHECK(dir_contents.count(entry.filename()));
+        assert(dir_contents.count(entry.filename()));
     }
     {
         std::error_code ec;
         directory_iterator it(symlinkToDir,
                               directory_options::follow_directory_symlink, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it != endIt);
+        assert(!ec);
+        assert(it != endIt);
         path const& entry = *it;
-        TEST_CHECK(dir_contents.count(entry.filename()));
+        assert(dir_contents.count(entry.filename()));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_constructor_signatures();
+    test_construction_from_bad_path();
+    access_denied_test_case();
+    access_denied_to_file_test_case();
+    test_open_on_empty_directory_equals_end();
+    test_open_on_directory_succeeds();
+    test_open_on_file_fails();
+    test_open_on_empty_string();
+    test_open_on_dot_dir();
+    test_open_on_symlink();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
index 09b5139..ca83031 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
@@ -21,14 +21,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_increment_tests)
-
-TEST_CASE(test_increment_signatures)
+static void test_increment_signatures()
 {
     directory_iterator d; ((void)d);
     std::error_code ec; ((void)ec);
@@ -40,7 +37,7 @@
     ASSERT_NOT_NOEXCEPT(d.increment(ec));
 }
 
-TEST_CASE(test_prefix_increment)
+static void test_prefix_increment()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -50,21 +47,21 @@
 
     std::error_code ec;
     directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         directory_iterator& it_ref = ++it;
-        TEST_CHECK(&it_ref == &it);
+        assert(&it_ref == &it);
     }
 
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_postfix_increment)
+static void test_postfix_increment()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -74,22 +71,22 @@
 
     std::error_code ec;
     directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         const path entry2 = *it++;
-        TEST_CHECK(entry2 == entry);
+        assert(entry2 == entry);
     }
 
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
 
-TEST_CASE(test_increment_method)
+static void test_increment_method()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -99,19 +96,26 @@
 
     std::error_code ec;
     directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         directory_iterator& it_ref = it.increment(ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(&it_ref == &it);
+        assert(!ec);
+        assert(&it_ref == &it);
     }
 
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_increment_signatures();
+    test_prefix_increment();
+    test_postfix_increment();
+    test_increment_method();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
index 6ae6eed..a1f730e 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
@@ -20,43 +20,46 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_move_construct_tests)
-
-TEST_CASE(test_constructor_signature)
+static void test_constructor_signature()
 {
     using D = directory_iterator;
     static_assert(std::is_nothrow_move_constructible<D>::value, "");
 }
 
-TEST_CASE(test_move_end_iterator)
+static void test_move_end_iterator()
 {
     const directory_iterator endIt;
     directory_iterator endIt2{};
 
     directory_iterator it(std::move(endIt2));
-    TEST_CHECK(it == endIt);
-    TEST_CHECK(endIt2 == endIt);
+    assert(it == endIt);
+    assert(endIt2 == endIt);
 }
 
-TEST_CASE(test_move_valid_iterator)
+static void test_move_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
     const directory_iterator endIt{};
 
     directory_iterator it(testDir);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     const path entry = *it;
 
     const directory_iterator it2(std::move(it));
-    TEST_CHECK(*it2 == entry);
+    assert(*it2 == entry);
 
-    TEST_CHECK(it == it2 || it == endIt);
+    assert(it == it2 || it == endIt);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_constructor_signature();
+    test_move_end_iterator();
+    test_move_valid_iterator();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
index d0beee1..636c54b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
@@ -20,7 +20,6 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 // The filesystem specification explicitly allows for self-move on
@@ -29,31 +28,29 @@
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_move_assign_tests)
-
-TEST_CASE(test_assignment_signature)
+static void test_assignment_signature()
 {
     using D = directory_iterator;
     static_assert(std::is_nothrow_move_assignable<D>::value, "");
 }
 
-TEST_CASE(test_move_to_end_iterator)
+static void test_move_to_end_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
 
     directory_iterator from(testDir);
-    TEST_REQUIRE(from != directory_iterator{});
+    assert(from != directory_iterator{});
     const path entry = *from;
 
     directory_iterator to{};
     to = std::move(from);
-    TEST_REQUIRE(to != directory_iterator{});
-    TEST_CHECK(*to == entry);
+    assert(to != directory_iterator{});
+    assert(*to == entry);
 }
 
 
-TEST_CASE(test_move_from_end_iterator)
+static void test_move_from_end_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -61,57 +58,65 @@
     directory_iterator from{};
 
     directory_iterator to(testDir);
-    TEST_REQUIRE(to != from);
+    assert(to != from);
 
     to = std::move(from);
-    TEST_REQUIRE(to == directory_iterator{});
-    TEST_REQUIRE(from == directory_iterator{});
+    assert(to == directory_iterator{});
+    assert(from == directory_iterator{});
 }
 
-TEST_CASE(test_move_valid_iterator)
+static void test_move_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
     const directory_iterator endIt{};
 
     directory_iterator it(testDir);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     ++it;
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     const path entry = *it;
 
     directory_iterator it2(testDir);
-    TEST_REQUIRE(it2 != it);
+    assert(it2 != it);
     const path entry2 = *it2;
-    TEST_CHECK(entry2 != entry);
+    assert(entry2 != entry);
 
     it2 = std::move(it);
-    TEST_REQUIRE(it2 != directory_iterator{});
-    TEST_CHECK(*it2 == entry);
+    assert(it2 != directory_iterator{});
+    assert(*it2 == entry);
 }
 
-TEST_CASE(test_returns_reference_to_self)
+static void test_returns_reference_to_self()
 {
     directory_iterator it;
     directory_iterator it2;
     directory_iterator& ref = (it2 = it);
-    TEST_CHECK(&ref == &it2);
+    assert(&ref == &it2);
 }
 
 
-TEST_CASE(test_self_move)
+static void test_self_move()
 {
     static_test_env static_env;
     // Create two non-equal iterators that have exactly the same state.
     directory_iterator it(static_env.Dir);
     directory_iterator it2(static_env.Dir);
     ++it; ++it2;
-    TEST_CHECK(it != it2);
-    TEST_CHECK(*it2 == *it);
+    assert(it != it2);
+    assert(*it2 == *it);
 
     it = std::move(it);
-    TEST_CHECK(*it2 == *it);
+    assert(*it2 == *it);
 }
 
+int main(int, char**) {
+    test_assignment_signature();
+    test_move_to_end_iterator();
+    test_move_from_end_iterator();
+    test_move_valid_iterator();
+    test_returns_reference_to_self();
+    test_self_move();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
index f6f0bbe..44cde7e 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
@@ -21,14 +21,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(directory_iterator_begin_end_tests)
-
-TEST_CASE(test_function_signatures)
+static void test_function_signatures()
 {
     directory_iterator d;
 
@@ -43,7 +40,7 @@
     ASSERT_NOEXCEPT(end(std::move(d)));
 }
 
-TEST_CASE(test_ranged_for_loop)
+static void test_ranged_for_loop()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -52,12 +49,17 @@
 
     std::error_code ec;
     directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     for (auto& elem : it) {
-        TEST_CHECK(dir_contents.erase(elem) == 1);
+        assert(dir_contents.erase(elem) == 1);
     }
-    TEST_CHECK(dir_contents.empty());
+    assert(dir_contents.empty());
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_function_signatures();
+    test_ranged_for_loop();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
index 3e194a7..504616c 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
@@ -131,9 +131,17 @@
       auto h2 = hash_value(p2);
       assert((h1 == h2) == (p1 == p2));
       // check signature
-      ASSERT_SAME_TYPE(size_t, decltype(hash_value(p1)));
+      ASSERT_SAME_TYPE(std::size_t, decltype(hash_value(p1)));
       ASSERT_NOEXCEPT(hash_value(p1));
     }
+    { // check std::hash
+      auto h1 = std::hash<fs::path>()(p1);
+      auto h2 = std::hash<fs::path>()(p2);
+      assert((h1 == h2) == (p1 == p2));
+      // check signature
+      ASSERT_SAME_TYPE(std::size_t, decltype(std::hash<fs::path>()(p1)));
+      ASSERT_NOEXCEPT(std::hash<fs::path>()(p1));
+    }
   }
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.verify.cpp
index 75e88e0..32bbc4c 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include "filesystem_include.h"
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     fs::path c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
index 0d17436..c6574d0 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
@@ -19,6 +19,7 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
 #include "filesystem_test_helper.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash.tested_elswhere.compile.pass.cpp
similarity index 69%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash.tested_elswhere.compile.pass.cpp
index 92dc58c..b69e224 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash.tested_elswhere.compile.pass.cpp
@@ -6,16 +6,5 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
-
-#include <complex.h>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
-
-  return 0;
-}
+// The std::hash specialization is tested as part of [path.compare]
+// in libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value.tested_elswhere.compile.pass.cpp
similarity index 69%
copy from third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
copy to third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value.tested_elswhere.compile.pass.cpp
index 92dc58c..9d7260d 100644
--- a/third_party/llvm-project/libcxx/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.path/path.nonmember/hash_value.tested_elswhere.compile.pass.cpp
@@ -6,16 +6,5 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <complex.h>
-
-#include <complex.h>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    std::complex<double> d;
-    (void)d;
-
-  return 0;
-}
+// The `hash_value` function is tested as part of [path.compare]
+// in libcxx/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
index aacf160..3e007dd 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
@@ -20,28 +20,25 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_copy_construct_tests)
-
-TEST_CASE(test_constructor_signature)
+static void test_constructor_signature()
 {
     using D = recursive_directory_iterator;
     static_assert(std::is_copy_constructible<D>::value, "");
     //static_assert(!std::is_nothrow_copy_constructible<D>::value, "");
 }
 
-TEST_CASE(test_copy_end_iterator)
+static void test_copy_end_iterator()
 {
     const recursive_directory_iterator endIt;
     recursive_directory_iterator it(endIt);
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_copy_valid_iterator)
+static void test_copy_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -54,26 +51,32 @@
     //  it.recursion_pending() != true
     const directory_options opts = directory_options::skip_permission_denied;
     recursive_directory_iterator it(testDir, opts);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     while (it.depth() == 0) {
         ++it;
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
     }
     it.disable_recursion_pending();
-    TEST_CHECK(it.options() == opts);
-    TEST_CHECK(it.depth() == 1);
-    TEST_CHECK(it.recursion_pending() == false);
+    assert(it.options() == opts);
+    assert(it.depth() == 1);
+    assert(it.recursion_pending() == false);
     const path entry = *it;
 
     // OPERATION UNDER TEST //
     const recursive_directory_iterator it2(it);
     // ------------------- //
 
-    TEST_REQUIRE(it2 == it);
-    TEST_CHECK(*it2 == entry);
-    TEST_CHECK(it2.depth() == 1);
-    TEST_CHECK(it2.recursion_pending() == false);
-    TEST_CHECK(it != endIt);
+    assert(it2 == it);
+    assert(*it2 == entry);
+    assert(it2.depth() == 1);
+    assert(it2.recursion_pending() == false);
+    assert(it != endIt);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_constructor_signature();
+    test_copy_end_iterator();
+    test_copy_valid_iterator();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
index dc689ad..95a7762 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
@@ -20,13 +20,10 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_copy_assign_tests)
-
 recursive_directory_iterator createInterestingIterator(const static_test_env &static_env)
     // Create an "interesting" iterator where all fields are
     // in a non-default state. The returned 'it' is in a
@@ -39,12 +36,12 @@
     const recursive_directory_iterator endIt;
     recursive_directory_iterator it(testDir,
                                     directory_options::skip_permission_denied);
-    TEST_ASSERT(it != endIt);
+    assert(it != endIt);
     while (it.depth() != 1) {
         ++it;
-        TEST_ASSERT(it != endIt);
+        assert(it != endIt);
     }
-    TEST_ASSERT(it.depth() == 1);
+    assert(it.depth() == 1);
     it.disable_recursion_pending();
     return it;
 }
@@ -62,21 +59,21 @@
     const recursive_directory_iterator endIt;
     recursive_directory_iterator it(testDir,
                                     directory_options::follow_directory_symlink);
-    TEST_ASSERT(it != endIt);
+    assert(it != endIt);
     while (it.depth() != 2) {
         ++it;
-        TEST_ASSERT(it != endIt);
+        assert(it != endIt);
     }
-    TEST_ASSERT(it.depth() == 2);
+    assert(it.depth() == 2);
     return it;
 }
 
-TEST_CASE(test_assignment_signature) {
+static void test_assignment_signature() {
     using D = recursive_directory_iterator;
     static_assert(std::is_copy_assignable<D>::value, "");
 }
 
-TEST_CASE(test_copy_to_end_iterator)
+static void test_copy_to_end_iterator()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
@@ -86,26 +83,26 @@
 
     recursive_directory_iterator to;
     to = from;
-    TEST_REQUIRE(to == from);
-    TEST_CHECK(*to == entry);
-    TEST_CHECK(to.options() == from.options());
-    TEST_CHECK(to.depth() == from.depth());
-    TEST_CHECK(to.recursion_pending() == from.recursion_pending());
+    assert(to == from);
+    assert(*to == entry);
+    assert(to.options() == from.options());
+    assert(to.depth() == from.depth());
+    assert(to.recursion_pending() == from.recursion_pending());
 }
 
 
-TEST_CASE(test_copy_from_end_iterator)
+static void test_copy_from_end_iterator()
 {
     static_test_env static_env;
     const recursive_directory_iterator from;
     recursive_directory_iterator to = createInterestingIterator(static_env);
 
     to = from;
-    TEST_REQUIRE(to == from);
-    TEST_CHECK(to == recursive_directory_iterator{});
+    assert(to == from);
+    assert(to == recursive_directory_iterator{});
 }
 
-TEST_CASE(test_copy_valid_iterator)
+static void test_copy_valid_iterator()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
@@ -114,48 +111,57 @@
     const path entry = *it;
 
     recursive_directory_iterator it2 = createDifferentInterestingIterator(static_env);
-    TEST_REQUIRE(it2                   != it);
-    TEST_CHECK(it2.options()           != it.options());
-    TEST_CHECK(it2.depth()             != it.depth());
-    TEST_CHECK(it2.recursion_pending() != it.recursion_pending());
-    TEST_CHECK(*it2                    != entry);
+    assert(it2                   != it);
+    assert(it2.options()           != it.options());
+    assert(it2.depth()             != it.depth());
+    assert(it2.recursion_pending() != it.recursion_pending());
+    assert(*it2                    != entry);
 
     it2 = it;
-    TEST_REQUIRE(it2                   == it);
-    TEST_CHECK(it2.options()           == it.options());
-    TEST_CHECK(it2.depth()             == it.depth());
-    TEST_CHECK(it2.recursion_pending() == it.recursion_pending());
-    TEST_CHECK(*it2                    == entry);
+    assert(it2                   == it);
+    assert(it2.options()           == it.options());
+    assert(it2.depth()             == it.depth());
+    assert(it2.recursion_pending() == it.recursion_pending());
+    assert(*it2                    == entry);
 }
 
-TEST_CASE(test_returns_reference_to_self)
+static void test_returns_reference_to_self()
 {
     const recursive_directory_iterator it;
     recursive_directory_iterator it2;
     recursive_directory_iterator& ref = (it2 = it);
-    TEST_CHECK(&ref == &it2);
+    assert(&ref == &it2);
 }
 
-TEST_CASE(test_self_copy)
+static void test_self_copy()
 {
     static_test_env static_env;
     // Create two non-equal iterators that have exactly the same state.
     recursive_directory_iterator it = createInterestingIterator(static_env);
     recursive_directory_iterator it2 = createInterestingIterator(static_env);
-    TEST_CHECK(it != it2);
-    TEST_CHECK(it2.options()           == it.options());
-    TEST_CHECK(it2.depth()             == it.depth());
-    TEST_CHECK(it2.recursion_pending() == it.recursion_pending());
-    TEST_CHECK(*it2 == *it);
+    assert(it != it2);
+    assert(it2.options()           == it.options());
+    assert(it2.depth()             == it.depth());
+    assert(it2.recursion_pending() == it.recursion_pending());
+    assert(*it2 == *it);
 
     // perform a self-copy and check that the state still matches the
     // other unmodified iterator.
     recursive_directory_iterator const& cit = it;
     it = cit;
-    TEST_CHECK(it2.options()           == it.options());
-    TEST_CHECK(it2.depth()             == it.depth());
-    TEST_CHECK(it2.recursion_pending() == it.recursion_pending());
-    TEST_CHECK(*it2 == *it);
+    assert(it2.options()           == it.options());
+    assert(it2.depth()             == it.depth());
+    assert(it2.recursion_pending() == it.recursion_pending());
+    assert(*it2 == *it);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_assignment_signature();
+    test_copy_to_end_iterator();
+    test_copy_from_end_iterator();
+    test_copy_valid_iterator();
+    test_returns_reference_to_self();
+    test_self_copy();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
index 5a18c46..ced81b9 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
@@ -24,17 +24,15 @@
 #include <set>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
 using RDI = recursive_directory_iterator;
 
-TEST_SUITE(recursive_directory_iterator_constructor_tests)
-
-TEST_CASE(test_constructor_signatures)
+static void test_constructor_signatures()
 {
     using D = recursive_directory_iterator;
 
@@ -58,7 +56,7 @@
     static_assert(!std::is_nothrow_constructible<D, path, directory_options, std::error_code&>::value, "");
 }
 
-TEST_CASE(test_construction_from_bad_path)
+static void test_construction_from_bad_path()
 {
     static_test_env static_env;
     std::error_code ec;
@@ -70,22 +68,22 @@
     {
         {
             RDI it(testPath, ec);
-            TEST_CHECK(ec);
-            TEST_CHECK(it == endIt);
+            assert(ec);
+            assert(it == endIt);
         }
         {
             RDI it(testPath, opts, ec);
-            TEST_CHECK(ec);
-            TEST_CHECK(it == endIt);
+            assert(ec);
+            assert(it == endIt);
         }
         {
-            TEST_CHECK_THROW(filesystem_error, RDI(testPath));
-            TEST_CHECK_THROW(filesystem_error, RDI(testPath, opts));
+            TEST_THROWS_TYPE(filesystem_error, RDI(testPath));
+            TEST_THROWS_TYPE(filesystem_error, RDI(testPath, opts));
         }
     }
 }
 
-TEST_CASE(access_denied_test_case)
+static void access_denied_test_case()
 {
     using namespace fs;
 #ifdef _WIN32
@@ -94,7 +92,7 @@
     // instead.
     const path testDir = GetWindowsInaccessibleDir();
     if (testDir.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     scoped_test_env env;
     path const testDir = env.make_env_path("dir1");
@@ -105,7 +103,7 @@
     // Test that we can iterator over the directory before changing the perms
     {
         RDI it(testDir);
-        TEST_REQUIRE(it != RDI{});
+        assert(it != RDI{});
     }
 
     // Change the permissions so we can no longer iterate
@@ -117,21 +115,21 @@
     {
         std::error_code ec;
         RDI it(testDir, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == RDI{});
+        assert(ec);
+        assert(it == RDI{});
     }
     // Check that construction does not report an error when
     // 'skip_permissions_denied' is given.
     {
         std::error_code ec;
         RDI it(testDir, directory_options::skip_permission_denied, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it == RDI{});
+        assert(!ec);
+        assert(it == RDI{});
     }
 }
 
 
-TEST_CASE(access_denied_to_file_test_case)
+static void access_denied_to_file_test_case()
 {
     using namespace fs;
 #ifdef _WIN32
@@ -140,7 +138,7 @@
     // instead.
     const path testDir = GetWindowsInaccessibleDir();
     if (testDir.empty())
-        TEST_UNSUPPORTED();
+        return;
     path const testFile = testDir / "inaccessible_file";
 #else
     scoped_test_env env;
@@ -156,20 +154,20 @@
     {
         std::error_code ec;
         RDI it(testFile, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == RDI{});
+        assert(ec);
+        assert(it == RDI{});
     }
     // Check that construction still fails when 'skip_permissions_denied' is given
     // because we tried to open a file and not a directory.
     {
         std::error_code ec;
         RDI it(testFile, directory_options::skip_permission_denied, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == RDI{});
+        assert(ec);
+        assert(it == RDI{});
     }
 }
 
-TEST_CASE(test_open_on_empty_directory_equals_end)
+static void test_open_on_empty_directory_equals_end()
 {
     scoped_test_env env;
     const path testDir = env.make_env_path("dir1");
@@ -179,16 +177,16 @@
     {
         std::error_code ec;
         RDI it(testDir, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(it == endIt);
+        assert(!ec);
+        assert(it == endIt);
     }
     {
         RDI it(testDir);
-        TEST_CHECK(it == endIt);
+        assert(it == endIt);
     }
 }
 
-TEST_CASE(test_open_on_directory_succeeds)
+static void test_open_on_directory_succeeds()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -199,18 +197,18 @@
     {
         std::error_code ec;
         RDI it(testDir, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it != endIt);
-        TEST_CHECK(dir_contents.count(*it));
+        assert(!ec);
+        assert(it != endIt);
+        assert(dir_contents.count(*it));
     }
     {
         RDI it(testDir);
-        TEST_CHECK(it != endIt);
-        TEST_CHECK(dir_contents.count(*it));
+        assert(it != endIt);
+        assert(dir_contents.count(*it));
     }
 }
 
-TEST_CASE(test_open_on_file_fails)
+static void test_open_on_file_fails()
 {
     static_test_env static_env;
     const path testFile = static_env.File;
@@ -218,15 +216,15 @@
     {
         std::error_code ec;
         RDI it(testFile, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(it == endIt);
+        assert(ec);
+        assert(it == endIt);
     }
     {
-        TEST_CHECK_THROW(filesystem_error, RDI(testFile));
+        TEST_THROWS_TYPE(filesystem_error, RDI(testFile));
     }
 }
 
-TEST_CASE(test_options_post_conditions)
+static void test_options_post_conditions()
 {
     static_test_env static_env;
     const path goodDir = static_env.Dir;
@@ -236,33 +234,45 @@
         std::error_code ec;
 
         RDI it1(goodDir, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it1.options() == directory_options::none);
+        assert(!ec);
+        assert(it1.options() == directory_options::none);
 
         RDI it2(badDir, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(it2 == RDI{});
+        assert(ec);
+        assert(it2 == RDI{});
     }
     {
         std::error_code ec;
         const directory_options opts = directory_options::skip_permission_denied;
 
         RDI it1(goodDir, opts, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(it1.options() == opts);
+        assert(!ec);
+        assert(it1.options() == opts);
 
         RDI it2(badDir, opts, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(it2 == RDI{});
+        assert(ec);
+        assert(it2 == RDI{});
     }
     {
         RDI it(goodDir);
-        TEST_CHECK(it.options() == directory_options::none);
+        assert(it.options() == directory_options::none);
     }
     {
         const directory_options opts = directory_options::follow_directory_symlink;
         RDI it(goodDir, opts);
-        TEST_CHECK(it.options() == opts);
+        assert(it.options() == opts);
     }
 }
-TEST_SUITE_END()
+
+int main(int, char**) {
+    test_constructor_signatures();
+    test_construction_from_bad_path();
+    access_denied_test_case();
+    access_denied_to_file_test_case();
+    test_open_on_empty_directory_equals_end();
+    test_open_on_directory_succeeds();
+    test_open_on_file_fails();
+    test_options_post_conditions();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
index 4983665..32bd074 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
@@ -19,15 +19,13 @@
 #include <set>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_depth_tests)
-
-TEST_CASE(test_depth)
+static void test_depth()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -37,8 +35,8 @@
 
     std::error_code ec;
     recursive_directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
-    TEST_CHECK(it.depth() == 0);
+    assert(!ec);
+    assert(it.depth() == 0);
 
     bool seen_d1, seen_d2;
     seen_d1 = seen_d2 = false;
@@ -47,20 +45,24 @@
         const path entry = *it;
         const path parent = entry.parent_path();
         if (parent == testDir) {
-            TEST_CHECK(it.depth() == 0);
+            assert(it.depth() == 0);
         } else if (parent == DirDepth1) {
-            TEST_CHECK(it.depth() == 1);
+            assert(it.depth() == 1);
             seen_d1 = true;
         } else if (parent == DirDepth2) {
-            TEST_CHECK(it.depth() == 2);
+            assert(it.depth() == 2);
             seen_d2 = true;
         } else {
-            TEST_CHECK(!"Unexpected depth while iterating over static env");
+            assert(!"Unexpected depth while iterating over static env");
         }
         ++it;
     }
-    TEST_REQUIRE(seen_d1 && seen_d2);
-    TEST_CHECK(it == endIt);
+    assert(seen_d1 && seen_d2);
+    assert(it == endIt);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_depth();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
index e9dc964..061046e 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
@@ -20,24 +20,26 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_disable_recursion_pending_tests)
 
 // NOTE: The main semantics of disable_recursion_pending are tested
 // in the 'recursion_pending()' tests.
-TEST_CASE(basic_test)
+static void basic_test()
 {
     static_test_env static_env;
     recursive_directory_iterator it(static_env.Dir);
-    TEST_REQUIRE(it.recursion_pending() == true);
+    assert(it.recursion_pending() == true);
     it.disable_recursion_pending();
-    TEST_CHECK(it.recursion_pending() == false);
+    assert(it.recursion_pending() == false);
     it.disable_recursion_pending();
-    TEST_CHECK(it.recursion_pending() == false);
+    assert(it.recursion_pending() == false);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    basic_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
index 4b8390e..9a157ad 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
@@ -20,15 +20,13 @@
 #include <set>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_increment_tests)
-
-TEST_CASE(test_increment_signatures)
+static void test_increment_signatures()
 {
     recursive_directory_iterator d; ((void)d);
     std::error_code ec; ((void)ec);
@@ -40,7 +38,7 @@
     ASSERT_NOT_NOEXCEPT(d.increment(ec));
 }
 
-TEST_CASE(test_prefix_increment)
+static void test_prefix_increment()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -50,21 +48,21 @@
 
     std::error_code ec;
     recursive_directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         recursive_directory_iterator& it_ref = ++it;
-        TEST_CHECK(&it_ref == &it);
+        assert(&it_ref == &it);
     }
 
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_postfix_increment)
+static void test_postfix_increment()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -74,21 +72,21 @@
 
     std::error_code ec;
     recursive_directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         const path entry2 = *it++;
-        TEST_CHECK(entry2 == entry);
+        assert(entry2 == entry);
     }
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
 
-TEST_CASE(test_increment_method)
+static void test_increment_method()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -98,22 +96,22 @@
 
     std::error_code ec;
     recursive_directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         recursive_directory_iterator& it_ref = it.increment(ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(&it_ref == &it);
+        assert(!ec);
+        assert(&it_ref == &it);
     }
 
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
-TEST_CASE(test_follow_symlinks)
+static void test_follow_symlinks()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -125,25 +123,25 @@
     std::error_code ec;
     recursive_directory_iterator it(testDir,
                               directory_options::follow_directory_symlink, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     std::set<path> unseen_entries = dir_contents;
     while (!unseen_entries.empty()) {
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
         const path entry = *it;
 
-        TEST_REQUIRE(unseen_entries.erase(entry) == 1);
+        assert(unseen_entries.erase(entry) == 1);
         recursive_directory_iterator& it_ref = it.increment(ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(&it_ref == &it);
+        assert(!ec);
+        assert(&it_ref == &it);
     }
-    TEST_CHECK(it == endIt);
+    assert(it == endIt);
 }
 
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-TEST_CASE(access_denied_on_recursion_test_case)
+static void access_denied_on_recursion_test_case()
 {
     using namespace fs;
     scoped_test_env env;
@@ -168,54 +166,54 @@
     {
         std::error_code ec = GetTestEC();
         recursive_directory_iterator it(startDir, ec);
-        TEST_REQUIRE(ec != GetTestEC());
-        TEST_REQUIRE(!ec);
+        assert(ec != GetTestEC());
+        assert(!ec);
         while (it != endIt && it->path() != permDeniedDir)
             ++it;
-        TEST_REQUIRE(it != endIt);
-        TEST_REQUIRE(*it == permDeniedDir);
+        assert(it != endIt);
+        assert(*it == permDeniedDir);
 
         it.increment(ec);
-        TEST_CHECK(ec);
-        TEST_CHECK(it == endIt);
+        assert(ec);
+        assert(it == endIt);
     }
     // Same as above but test operator++().
     {
         std::error_code ec = GetTestEC();
         recursive_directory_iterator it(startDir, ec);
-        TEST_REQUIRE(!ec);
+        assert(!ec);
         while (it != endIt && it->path() != permDeniedDir)
             ++it;
-        TEST_REQUIRE(it != endIt);
-        TEST_REQUIRE(*it == permDeniedDir);
+        assert(it != endIt);
+        assert(*it == permDeniedDir);
 
-        TEST_REQUIRE_THROW(filesystem_error, ++it);
+        TEST_THROWS_TYPE(filesystem_error, ++it);
     }
     // Test that recursion resulting in a "EACCESS" error is ignored when the
     // correct options are given to the constructor.
     {
         std::error_code ec = GetTestEC();
         recursive_directory_iterator it(startDir, SkipEPerm, ec);
-        TEST_REQUIRE(!ec);
-        TEST_REQUIRE(it != endIt);
+        assert(!ec);
+        assert(it != endIt);
 
         bool seenOtherFile = false;
         if (*it == otherFile) {
             ++it;
             seenOtherFile = true;
-            TEST_REQUIRE (it != endIt);
+            assert (it != endIt);
         }
-        TEST_REQUIRE(*it == permDeniedDir);
+        assert(*it == permDeniedDir);
 
         ec = GetTestEC();
         it.increment(ec);
-        TEST_REQUIRE(!ec);
+        assert(!ec);
 
         if (seenOtherFile) {
-            TEST_CHECK(it == endIt);
+            assert(it == endIt);
         } else {
-            TEST_CHECK(it != endIt);
-            TEST_CHECK(*it == otherFile);
+            assert(it != endIt);
+            assert(*it == otherFile);
         }
     }
     // Test that construction resulting in a "EACCESS" error is not ignored
@@ -223,12 +221,12 @@
     {
         std::error_code ec;
         recursive_directory_iterator it(permDeniedDir, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(it == endIt);
+        assert(ec);
+        assert(it == endIt);
     }
     // Same as above but testing the throwing constructors
     {
-        TEST_REQUIRE_THROW(filesystem_error,
+        TEST_THROWS_TYPE(filesystem_error,
                            recursive_directory_iterator(permDeniedDir));
     }
     // Test that construction resulting in a "EACCESS" error constructs the
@@ -236,13 +234,13 @@
     {
         std::error_code ec = GetTestEC();
         recursive_directory_iterator it(permDeniedDir, SkipEPerm, ec);
-        TEST_REQUIRE(!ec);
-        TEST_REQUIRE(it == endIt);
+        assert(!ec);
+        assert(it == endIt);
     }
 }
 
 // See llvm.org/PR35078
-TEST_CASE(test_PR35078)
+static void test_PR35078()
 {
   using namespace fs;
     scoped_test_env env;
@@ -284,46 +282,46 @@
     {
       bool SeenNestedFile = false;
       recursive_directory_iterator it = SetupState(false, SeenNestedFile);
-      TEST_REQUIRE(it != endIt);
-      TEST_REQUIRE(*it == nestedDir);
+      assert(it != endIt);
+      assert(*it == nestedDir);
       ec = GetTestEC();
       it.increment(ec);
-      TEST_CHECK(ec);
-      TEST_CHECK(ErrorIs(ec, eacess));
-      TEST_CHECK(it == endIt);
+      assert(ec);
+      assert(ErrorIs(ec, eacess));
+      assert(it == endIt);
     }
     {
       bool SeenNestedFile = false;
       recursive_directory_iterator it = SetupState(true, SeenNestedFile);
-      TEST_REQUIRE(it != endIt);
-      TEST_REQUIRE(*it == nestedDir);
+      assert(it != endIt);
+      assert(*it == nestedDir);
       ec = GetTestEC();
       it.increment(ec);
-      TEST_CHECK(!ec);
+      assert(!ec);
       if (SeenNestedFile) {
-        TEST_CHECK(it == endIt);
+        assert(it == endIt);
       } else {
-        TEST_REQUIRE(it != endIt);
-        TEST_CHECK(*it == nestedFile);
+        assert(it != endIt);
+        assert(*it == nestedFile);
       }
     }
     {
       bool SeenNestedFile = false;
       recursive_directory_iterator it = SetupState(false, SeenNestedFile);
-      TEST_REQUIRE(it != endIt);
-      TEST_REQUIRE(*it == nestedDir);
+      assert(it != endIt);
+      assert(*it == nestedDir);
 
       ExceptionChecker Checker(std::errc::permission_denied,
                                "recursive_directory_iterator::operator++()",
                                format_string("attempting recursion into \"%s\"",
                                              nestedDir.string().c_str()));
-      TEST_CHECK_THROW_RESULT(filesystem_error, Checker, ++it);
+      TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, ++it);
     }
 }
 
 
 // See llvm.org/PR35078
-TEST_CASE(test_PR35078_with_symlink)
+static void test_PR35078_with_symlink()
 {
   using namespace fs;
     scoped_test_env env;
@@ -383,30 +381,30 @@
       recursive_directory_iterator it = SetupState(TC.SkipPermDenied,
                                                    TC.FollowSymlinks,
                                                    SeenNestedFile);
-      TEST_REQUIRE(!ec);
-      TEST_REQUIRE(it != endIt);
-      TEST_REQUIRE(*it == symDir);
+      assert(!ec);
+      assert(it != endIt);
+      assert(*it == symDir);
       ec = GetTestEC();
       it.increment(ec);
       if (TC.ExpectSuccess) {
-        TEST_CHECK(!ec);
+        assert(!ec);
         if (SeenNestedFile) {
-          TEST_CHECK(it == endIt);
+          assert(it == endIt);
         } else {
-          TEST_REQUIRE(it != endIt);
-          TEST_CHECK(*it == nestedFile);
+          assert(it != endIt);
+          assert(*it == nestedFile);
         }
       } else {
-        TEST_CHECK(ec);
-        TEST_CHECK(ErrorIs(ec, eacess));
-        TEST_CHECK(it == endIt);
+        assert(ec);
+        assert(ErrorIs(ec, eacess));
+        assert(it == endIt);
       }
     }
 }
 
 
 // See llvm.org/PR35078
-TEST_CASE(test_PR35078_with_symlink_file)
+static void test_PR35078_with_symlink_file()
 {
   using namespace fs;
     scoped_test_env env;
@@ -466,34 +464,47 @@
       recursive_directory_iterator it = SetupState(TC.SkipPermDenied,
                                                    TC.FollowSymlinks,
                                                    SeenNestedFile);
-      TEST_REQUIRE(!ec);
-      TEST_REQUIRE(it != EndIt);
-      TEST_REQUIRE(*it == nestedDir);
+      assert(!ec);
+      assert(it != EndIt);
+      assert(*it == nestedDir);
       ec = GetTestEC();
       it.increment(ec);
-      TEST_REQUIRE(it != EndIt);
-      TEST_CHECK(!ec);
-      TEST_CHECK(*it == symFile);
+      assert(it != EndIt);
+      assert(!ec);
+      assert(*it == symFile);
       ec = GetTestEC();
       it.increment(ec);
       if (TC.ExpectSuccess) {
         if (!SeenNestedFile) {
-          TEST_CHECK(!ec);
-          TEST_REQUIRE(it != EndIt);
-          TEST_CHECK(*it == nestedFile);
+          assert(!ec);
+          assert(it != EndIt);
+          assert(*it == nestedFile);
           ec = GetTestEC();
           it.increment(ec);
         }
-        TEST_CHECK(!ec);
-        TEST_CHECK(it == EndIt);
+        assert(!ec);
+        assert(it == EndIt);
       } else {
-        TEST_CHECK(ec);
-        TEST_CHECK(ErrorIs(ec, eacess));
-        TEST_CHECK(it == EndIt);
+        assert(ec);
+        assert(ErrorIs(ec, eacess));
+        assert(it == EndIt);
       }
     }
 }
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+
+int main(int, char**) {
+    test_increment_signatures();
+    test_prefix_increment();
+    test_postfix_increment();
+    test_increment_method();
+    test_follow_symlinks();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+    access_denied_on_recursion_test_case();
+    test_PR35078();
+    test_PR35078_with_symlink();
+    test_PR35078_with_symlink_file();
 #endif
 
-
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
index 7dcc47d..be32042 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
@@ -20,30 +20,27 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_move_construct_tests)
-
-TEST_CASE(test_constructor_signature)
+static void test_constructor_signature()
 {
     using D = recursive_directory_iterator;
     static_assert(std::is_nothrow_move_constructible<D>::value, "");
 }
 
-TEST_CASE(test_move_end_iterator)
+static void test_move_end_iterator()
 {
     const recursive_directory_iterator endIt;
     recursive_directory_iterator endIt2{};
 
     recursive_directory_iterator it(std::move(endIt2));
-    TEST_CHECK(it == endIt);
-    TEST_CHECK(endIt2 == endIt);
+    assert(it == endIt);
+    assert(endIt2 == endIt);
 }
 
-TEST_CASE(test_move_valid_iterator)
+static void test_move_valid_iterator()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -56,25 +53,31 @@
     //  it.recursion_pending() != true
     const directory_options opts = directory_options::skip_permission_denied;
     recursive_directory_iterator it(testDir, opts);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
     while (it.depth() == 0) {
         ++it;
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
     }
     it.disable_recursion_pending();
-    TEST_CHECK(it.options() == opts);
-    TEST_CHECK(it.depth() == 1);
-    TEST_CHECK(it.recursion_pending() == false);
+    assert(it.options() == opts);
+    assert(it.depth() == 1);
+    assert(it.recursion_pending() == false);
     const path entry = *it;
 
     // OPERATION UNDER TEST //
     const recursive_directory_iterator it2(std::move(it));
     // ------------------- //
 
-    TEST_REQUIRE(it2 != endIt);
-    TEST_CHECK(*it2 == entry);
-    TEST_CHECK(it2.depth() == 1);
-    TEST_CHECK(it2.recursion_pending() == false);
+    assert(it2 != endIt);
+    assert(*it2 == entry);
+    assert(it2.depth() == 1);
+    assert(it2.recursion_pending() == false);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_constructor_signature();
+    test_move_end_iterator();
+    test_move_valid_iterator();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
index abe5dd7..65c3042 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
@@ -20,7 +20,6 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 // The filesystem specification explicitly allows for self-move on
@@ -29,8 +28,6 @@
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_move_assign_tests)
-
 recursive_directory_iterator createInterestingIterator(const static_test_env &static_env)
     // Create an "interesting" iterator where all fields are
     // in a non-default state. The returned 'it' is in a
@@ -43,12 +40,12 @@
     const recursive_directory_iterator endIt;
     recursive_directory_iterator it(testDir,
                                     directory_options::skip_permission_denied);
-    TEST_ASSERT(it != endIt);
+    assert(it != endIt);
     while (it.depth() != 1) {
         ++it;
-        TEST_ASSERT(it != endIt);
+        assert(it != endIt);
     }
-    TEST_ASSERT(it.depth() == 1);
+    assert(it.depth() == 1);
     it.disable_recursion_pending();
     return it;
 }
@@ -65,24 +62,24 @@
     const recursive_directory_iterator endIt;
     recursive_directory_iterator it(testDir,
                                     directory_options::follow_directory_symlink);
-    TEST_ASSERT(it != endIt);
+    assert(it != endIt);
     while (it.depth() != 2) {
         ++it;
-        TEST_ASSERT(it != endIt);
+        assert(it != endIt);
     }
-    TEST_ASSERT(it.depth() == 2);
+    assert(it.depth() == 2);
     return it;
 }
 
 
-TEST_CASE(test_assignment_signature)
+static void test_assignment_signature()
 {
     using D = recursive_directory_iterator;
     static_assert(std::is_nothrow_move_assignable<D>::value, "");
 }
 
 
-TEST_CASE(test_move_to_end_iterator)
+static void test_move_to_end_iterator()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
@@ -93,27 +90,27 @@
 
     recursive_directory_iterator to;
     to = std::move(from);
-    TEST_REQUIRE(to != endIt);
-    TEST_CHECK(*to == entry);
-    TEST_CHECK(to.options() == from_copy.options());
-    TEST_CHECK(to.depth() == from_copy.depth());
-    TEST_CHECK(to.recursion_pending() == from_copy.recursion_pending());
-    TEST_CHECK(from == endIt || from == to);
+    assert(to != endIt);
+    assert(*to == entry);
+    assert(to.options() == from_copy.options());
+    assert(to.depth() == from_copy.depth());
+    assert(to.recursion_pending() == from_copy.recursion_pending());
+    assert(from == endIt || from == to);
 }
 
 
-TEST_CASE(test_move_from_end_iterator)
+static void test_move_from_end_iterator()
 {
     static_test_env static_env;
     recursive_directory_iterator from;
     recursive_directory_iterator to = createInterestingIterator(static_env);
 
     to = std::move(from);
-    TEST_REQUIRE(to == from);
-    TEST_CHECK(to == recursive_directory_iterator{});
+    assert(to == from);
+    assert(to == recursive_directory_iterator{});
 }
 
-TEST_CASE(test_move_valid_iterator)
+static void test_move_valid_iterator()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
@@ -124,47 +121,55 @@
 
     recursive_directory_iterator it2 = createDifferentInterestingIterator(static_env);
     const recursive_directory_iterator it2_copy(it2);
-    TEST_REQUIRE(it2 != it);
-    TEST_CHECK(it2.options() != it.options());
-    TEST_CHECK(it2.depth() != it.depth());
-    TEST_CHECK(it2.recursion_pending() != it.recursion_pending());
-    TEST_CHECK(*it2 != entry);
+    assert(it2 != it);
+    assert(it2.options() != it.options());
+    assert(it2.depth() != it.depth());
+    assert(it2.recursion_pending() != it.recursion_pending());
+    assert(*it2 != entry);
 
     it2 = std::move(it);
-    TEST_REQUIRE(it2 != it2_copy && it2 != endIt);
-    TEST_CHECK(it2.options() == it_copy.options());
-    TEST_CHECK(it2.depth() == it_copy.depth());
-    TEST_CHECK(it2.recursion_pending() == it_copy.recursion_pending());
-    TEST_CHECK(*it2 == entry);
-    TEST_CHECK(it == endIt || it == it2);
+    assert(it2 != it2_copy && it2 != endIt);
+    assert(it2.options() == it_copy.options());
+    assert(it2.depth() == it_copy.depth());
+    assert(it2.recursion_pending() == it_copy.recursion_pending());
+    assert(*it2 == entry);
+    assert(it == endIt || it == it2);
 }
 
-TEST_CASE(test_returns_reference_to_self)
+static void test_returns_reference_to_self()
 {
     recursive_directory_iterator it;
     recursive_directory_iterator it2;
     recursive_directory_iterator& ref = (it2 = std::move(it));
-    TEST_CHECK(&ref == &it2);
+    assert(&ref == &it2);
 }
 
-TEST_CASE(test_self_move)
+static void test_self_move()
 {
     static_test_env static_env;
     // Create two non-equal iterators that have exactly the same state.
     recursive_directory_iterator it = createInterestingIterator(static_env);
     recursive_directory_iterator it2 = createInterestingIterator(static_env);
-    TEST_CHECK(it != it2);
-    TEST_CHECK(it2.options()           == it.options());
-    TEST_CHECK(it2.depth()             == it.depth());
-    TEST_CHECK(it2.recursion_pending() == it.recursion_pending());
-    TEST_CHECK(*it2 == *it);
+    assert(it != it2);
+    assert(it2.options()           == it.options());
+    assert(it2.depth()             == it.depth());
+    assert(it2.recursion_pending() == it.recursion_pending());
+    assert(*it2 == *it);
 
     it = std::move(it);
-    TEST_CHECK(it2.options()           == it.options());
-    TEST_CHECK(it2.depth()             == it.depth());
-    TEST_CHECK(it2.recursion_pending() == it.recursion_pending());
-    TEST_CHECK(*it2 == *it);
+    assert(it2.options()           == it.options());
+    assert(it2.depth()             == it.depth());
+    assert(it2.recursion_pending() == it.recursion_pending());
+    assert(*it2 == *it);
 }
 
+int main(int, char**) {
+    test_assignment_signature();
+    test_move_to_end_iterator();
+    test_move_from_end_iterator();
+    test_move_valid_iterator();
+    test_returns_reference_to_self();
+    test_self_move();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
index 40b09f1..0a80fe1 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
@@ -20,14 +20,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_pop_tests)
-
-TEST_CASE(signature_tests)
+static void signature_tests()
 {
     recursive_directory_iterator it{}; ((void)it);
     std::error_code ec; ((void)ec);
@@ -37,7 +34,7 @@
 
 // NOTE: Since the order of iteration is unspecified we use a list of
 // seen files at each depth to determine the new depth after a 'pop()' operation.
-TEST_CASE(test_depth)
+static void test_depth()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt{};
@@ -50,8 +47,8 @@
 
     std::error_code ec;
     recursive_directory_iterator it(static_env.Dir, ec);
-    TEST_REQUIRE(it != endIt);
-    TEST_CHECK(it.depth() == 0);
+    assert(it != endIt);
+    assert(it.depth() == 0);
 
     while (it.depth() != 2) {
         if (it.depth() == 0)
@@ -59,35 +56,40 @@
         else
             notSeenDepth1.erase(it->path());
         ++it;
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
     }
 
     while (true) {
         auto set_ec = std::make_error_code(std::errc::address_in_use);
         it.pop(set_ec);
-        TEST_REQUIRE(!set_ec);
+        assert(!set_ec);
 
         if (it == endIt) {
             // We must have seen every entry at depth 0 and 1.
-            TEST_REQUIRE(notSeenDepth0.empty() && notSeenDepth1.empty());
+            assert(notSeenDepth0.empty() && notSeenDepth1.empty());
             break;
         }
         else if (it.depth() == 1) {
             // If we popped to depth 1 then there must be unseen entries
             // at this level.
-            TEST_REQUIRE(!notSeenDepth1.empty());
-            TEST_CHECK(notSeenDepth1.count(it->path()));
+            assert(!notSeenDepth1.empty());
+            assert(notSeenDepth1.count(it->path()));
             notSeenDepth1.clear();
         }
         else if (it.depth() == 0) {
             // If we popped to depth 0 there must be unseen entries at this
             // level. There should also be no unseen entries at depth 1.
-            TEST_REQUIRE(!notSeenDepth0.empty());
-            TEST_REQUIRE(notSeenDepth1.empty());
-            TEST_CHECK(notSeenDepth0.count(it->path()));
+            assert(!notSeenDepth0.empty());
+            assert(notSeenDepth1.empty());
+            assert(notSeenDepth0.count(it->path()));
             notSeenDepth0.clear();
         }
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_tests();
+    test_depth();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
index 82c82c7..721ed7b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
@@ -20,21 +20,18 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_recursion_pending_tests)
-
-TEST_CASE(initial_value_test)
+static void initial_value_test()
 {
     static_test_env static_env;
     recursive_directory_iterator it(static_env.Dir);
-    TEST_REQUIRE(it.recursion_pending() == true);
+    assert(it.recursion_pending() == true);
 }
 
-TEST_CASE(value_after_copy_construction_and_assignment_test)
+static void value_after_copy_construction_and_assignment_test()
 {
     static_test_env static_env;
     recursive_directory_iterator rec_pending_it(static_env.Dir);
@@ -43,31 +40,31 @@
 
     { // copy construction
         recursive_directory_iterator it(rec_pending_it);
-        TEST_CHECK(it.recursion_pending() == true);
+        assert(it.recursion_pending() == true);
         it.disable_recursion_pending();
-        TEST_REQUIRE(rec_pending_it.recursion_pending() == true);
+        assert(rec_pending_it.recursion_pending() == true);
 
         recursive_directory_iterator it2(no_rec_pending_it);
-        TEST_CHECK(it2.recursion_pending() == false);
+        assert(it2.recursion_pending() == false);
     }
     { // copy assignment
         recursive_directory_iterator it(static_env.Dir);
         it.disable_recursion_pending();
         it = rec_pending_it;
-        TEST_CHECK(it.recursion_pending() == true);
+        assert(it.recursion_pending() == true);
         it.disable_recursion_pending();
-        TEST_REQUIRE(rec_pending_it.recursion_pending() == true);
+        assert(rec_pending_it.recursion_pending() == true);
 
         recursive_directory_iterator it2(static_env.Dir);
         it2 = no_rec_pending_it;
-        TEST_CHECK(it2.recursion_pending() == false);
+        assert(it2.recursion_pending() == false);
     }
-    TEST_CHECK(rec_pending_it.recursion_pending() == true);
-    TEST_CHECK(no_rec_pending_it.recursion_pending() == false);
+    assert(rec_pending_it.recursion_pending() == true);
+    assert(no_rec_pending_it.recursion_pending() == false);
 }
 
 
-TEST_CASE(value_after_move_construction_and_assignment_test)
+static void value_after_move_construction_and_assignment_test()
 {
     static_test_env static_env;
     recursive_directory_iterator rec_pending_it(static_env.Dir);
@@ -77,60 +74,60 @@
     { // move construction
         recursive_directory_iterator it_cp(rec_pending_it);
         recursive_directory_iterator it(std::move(it_cp));
-        TEST_CHECK(it.recursion_pending() == true);
+        assert(it.recursion_pending() == true);
 
         recursive_directory_iterator it_cp2(no_rec_pending_it);
         recursive_directory_iterator it2(std::move(it_cp2));
-        TEST_CHECK(it2.recursion_pending() == false);
+        assert(it2.recursion_pending() == false);
     }
     { // copy assignment
         recursive_directory_iterator it(static_env.Dir);
         it.disable_recursion_pending();
         recursive_directory_iterator it_cp(rec_pending_it);
         it = std::move(it_cp);
-        TEST_CHECK(it.recursion_pending() == true);
+        assert(it.recursion_pending() == true);
 
         recursive_directory_iterator it2(static_env.Dir);
         recursive_directory_iterator it_cp2(no_rec_pending_it);
         it2 = std::move(it_cp2);
-        TEST_CHECK(it2.recursion_pending() == false);
+        assert(it2.recursion_pending() == false);
     }
-    TEST_CHECK(rec_pending_it.recursion_pending() == true);
-    TEST_CHECK(no_rec_pending_it.recursion_pending() == false);
+    assert(rec_pending_it.recursion_pending() == true);
+    assert(no_rec_pending_it.recursion_pending() == false);
 }
 
-TEST_CASE(increment_resets_value)
+static void increment_resets_value()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
     {
         recursive_directory_iterator it(static_env.Dir);
         it.disable_recursion_pending();
-        TEST_CHECK(it.recursion_pending() == false);
+        assert(it.recursion_pending() == false);
         ++it;
-        TEST_CHECK(it.recursion_pending() == true);
-        TEST_CHECK(it.depth() == 0);
+        assert(it.recursion_pending() == true);
+        assert(it.depth() == 0);
     }
     {
         recursive_directory_iterator it(static_env.Dir);
         it.disable_recursion_pending();
-        TEST_CHECK(it.recursion_pending() == false);
+        assert(it.recursion_pending() == false);
         it++;
-        TEST_CHECK(it.recursion_pending() == true);
-        TEST_CHECK(it.depth() == 0);
+        assert(it.recursion_pending() == true);
+        assert(it.depth() == 0);
     }
     {
         recursive_directory_iterator it(static_env.Dir);
         it.disable_recursion_pending();
-        TEST_CHECK(it.recursion_pending() == false);
+        assert(it.recursion_pending() == false);
         std::error_code ec;
         it.increment(ec);
-        TEST_CHECK(it.recursion_pending() == true);
-        TEST_CHECK(it.depth() == 0);
+        assert(it.recursion_pending() == true);
+        assert(it.depth() == 0);
     }
 }
 
-TEST_CASE(pop_does_not_reset_value)
+static void pop_does_not_reset_value()
 {
     static_test_env static_env;
     const recursive_directory_iterator endIt;
@@ -139,28 +136,36 @@
     std::set<path> notSeenDepth0(DE0.begin(), DE0.end());
 
     recursive_directory_iterator it(static_env.Dir);
-    TEST_REQUIRE(it != endIt);
+    assert(it != endIt);
 
     while (it.depth() == 0) {
         notSeenDepth0.erase(it->path());
         ++it;
-        TEST_REQUIRE(it != endIt);
+        assert(it != endIt);
     }
-    TEST_REQUIRE(it.depth() == 1);
+    assert(it.depth() == 1);
     it.disable_recursion_pending();
     it.pop();
     // Since the order of iteration is unspecified the pop() could result
     // in the end iterator. When this is the case it is undefined behavior
     // to call recursion_pending().
     if (it == endIt) {
-        TEST_CHECK(notSeenDepth0.empty());
+        assert(notSeenDepth0.empty());
 #if defined(_LIBCPP_VERSION)
-        TEST_CHECK(it.recursion_pending() == false);
+        assert(it.recursion_pending() == false);
 #endif
     } else {
-        TEST_CHECK(! notSeenDepth0.empty());
-        TEST_CHECK(it.recursion_pending() == false);
+        assert(! notSeenDepth0.empty());
+        assert(it.recursion_pending() == false);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    initial_value_test();
+    value_after_copy_construction_and_assignment_test();
+    value_after_move_construction_and_assignment_test();
+    increment_resets_value();
+    pop_does_not_reset_value();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
index 104e419..f0b6804 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
@@ -21,14 +21,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(recursive_directory_iterator_begin_end_tests)
-
-TEST_CASE(test_function_signatures)
+static void test_function_signatures()
 {
     recursive_directory_iterator d;
 
@@ -43,7 +40,7 @@
     ASSERT_NOEXCEPT(end(std::move(d)));
 }
 
-TEST_CASE(test_ranged_for_loop)
+static void test_ranged_for_loop()
 {
     static_test_env static_env;
     const path testDir = static_env.Dir;
@@ -52,12 +49,17 @@
 
     std::error_code ec;
     recursive_directory_iterator it(testDir, ec);
-    TEST_REQUIRE(!ec);
+    assert(!ec);
 
     for (auto& elem : it) {
-        TEST_CHECK(dir_contents.erase(elem) == 1);
+        assert(dir_contents.erase(elem) == 1);
     }
-    TEST_CHECK(dir_contents.empty());
+    assert(dir_contents.empty());
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_function_signatures();
+    test_ranged_for_loop();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
index 4b597fc..2a05056 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
@@ -17,14 +17,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_absolute_path_test_suite)
-
-TEST_CASE(absolute_signature_test)
+static void absolute_signature_test()
 {
     const path p; ((void)p);
     std::error_code ec;
@@ -33,7 +30,7 @@
 }
 
 
-TEST_CASE(basic_test)
+static void basic_test()
 {
     const fs::path cwd = fs::current_path();
     const struct {
@@ -48,11 +45,16 @@
     for (auto& TC : TestCases) {
         std::error_code ec = GetTestEC();
         const path ret = absolute(TC.input, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(ret.is_absolute());
-        TEST_CHECK(PathEqIgnoreSep(ret, TC.expect));
-        LIBCPP_ONLY(TEST_CHECK(PathEq(ret, TC.expect)));
+        assert(!ec);
+        assert(ret.is_absolute());
+        assert(PathEqIgnoreSep(ret, TC.expect));
+        LIBCPP_ONLY(assert(PathEq(ret, TC.expect)));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    absolute_signature_test();
+    basic_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
index 707b646..fb88b4a 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
@@ -17,15 +17,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_canonical_path_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -35,7 +33,7 @@
 
 // There are 4 cases is the proposal for absolute path.
 // Each scope tests one of the cases.
-TEST_CASE(test_canonical)
+static void test_canonical()
 {
     static_test_env static_env;
     CWDGuard guard;
@@ -68,30 +66,30 @@
         std::error_code ec = GetTestEC();
         fs::current_path(TC.base);
         const path ret = canonical(TC.p, ec);
-        TEST_REQUIRE(!ec);
+        assert(!ec);
         const path ret2 = canonical(TC.p);
-        TEST_CHECK(PathEq(ret, TC.expect));
-        TEST_CHECK(PathEq(ret, ret2));
-        TEST_CHECK(ret.is_absolute());
+        assert(PathEq(ret, TC.expect));
+        assert(PathEq(ret, ret2));
+        assert(ret.is_absolute());
     }
 }
 
-TEST_CASE(test_dne_path)
+static void test_dne_path()
 {
     static_test_env static_env;
     std::error_code ec = GetTestEC();
     {
         const path ret = canonical(static_env.DNE, ec);
-        TEST_CHECK(ec != GetTestEC());
-        TEST_REQUIRE(ec);
-        TEST_CHECK(ret == path{});
+        assert(ec != GetTestEC());
+        assert(ec);
+        assert(ret == path{});
     }
     {
-        TEST_CHECK_THROW(filesystem_error, canonical(static_env.DNE));
+        TEST_THROWS_TYPE(filesystem_error, canonical(static_env.DNE));
     }
 }
 
-TEST_CASE(test_exception_contains_paths)
+static void test_exception_contains_paths()
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     static_test_env static_env;
@@ -99,21 +97,28 @@
     const path p = "blabla/dne";
     try {
         (void)canonical(p);
-        TEST_REQUIRE(false);
+        assert(false);
     } catch (filesystem_error const& err) {
-        TEST_CHECK(err.path1() == p);
+        assert(err.path1() == p);
         // libc++ provides the current path as the second path in the exception
-        LIBCPP_ONLY(TEST_CHECK(err.path2() == current_path()));
+        LIBCPP_ONLY(assert(err.path2() == current_path()));
     }
     fs::current_path(static_env.Dir);
     try {
         (void)canonical(p);
-        TEST_REQUIRE(false);
+        assert(false);
     } catch (filesystem_error const& err) {
-        TEST_CHECK(err.path1() == p);
-        LIBCPP_ONLY(TEST_CHECK(err.path2() == static_env.Dir));
+        assert(err.path1() == p);
+        LIBCPP_ONLY(assert(err.path2() == static_env.Dir));
     }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    test_canonical();
+    test_dne_path();
+    test_exception_contains_paths();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
index 3f9574d..2d7acf3 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
@@ -22,16 +22,13 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
 using CO = fs::copy_options;
 
-TEST_SUITE(filesystem_copy_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -44,7 +41,7 @@
 
 // There are 4 cases is the proposal for absolute path.
 // Each scope tests one of the cases.
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, path const& t, const std::error_code& ec)
     {
@@ -69,7 +66,7 @@
     const path dir = env.create_dir("dir");
 #ifndef _WIN32
     const path fifo = env.create_fifo("fifo");
-    TEST_REQUIRE(is_other(fifo));
+    assert(is_other(fifo));
 #endif
 
     const auto test_ec = GetTestEC();
@@ -80,43 +77,43 @@
         const path f = static_env.DNE;
         const path t = env.test_root;
         fs::copy(f, t, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(ec != test_ec);
-        TEST_CHECK(checkThrow(f, t, ec));
+        assert(ec);
+        assert(ec != test_ec);
+        assert(checkThrow(f, t, ec));
     }
     { // equivalent(f, t) == true
         std::error_code ec = test_ec;
         fs::copy(file, file, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(ec != test_ec);
-        TEST_CHECK(checkThrow(file, file, ec));
+        assert(ec);
+        assert(ec != test_ec);
+        assert(checkThrow(file, file, ec));
     }
     { // is_directory(from) && is_file(to)
         std::error_code ec = test_ec;
         fs::copy(dir, file, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(ec != test_ec);
-        TEST_CHECK(checkThrow(dir, file, ec));
+        assert(ec);
+        assert(ec != test_ec);
+        assert(checkThrow(dir, file, ec));
     }
 #ifndef _WIN32
     { // is_other(from)
         std::error_code ec = test_ec;
         fs::copy(fifo, dir, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(ec != test_ec);
-        TEST_CHECK(checkThrow(fifo, dir, ec));
+        assert(ec);
+        assert(ec != test_ec);
+        assert(checkThrow(fifo, dir, ec));
     }
     { // is_other(to)
         std::error_code ec = test_ec;
         fs::copy(file, fifo, ec);
-        TEST_REQUIRE(ec);
-        TEST_REQUIRE(ec != test_ec);
-        TEST_CHECK(checkThrow(file, fifo, ec));
+        assert(ec);
+        assert(ec != test_ec);
+        assert(checkThrow(file, fifo, ec));
     }
 #endif
 }
 
-TEST_CASE(from_is_symlink)
+static void from_is_symlink()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
@@ -126,32 +123,32 @@
     { // skip symlinks
         std::error_code ec = GetTestEC();
         fs::copy(symlink, dne, copy_options::skip_symlinks, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(dne));
+        assert(!ec);
+        assert(!exists(dne));
     }
     {
         const path dest = env.make_env_path("dest");
         std::error_code ec = GetTestEC();
         fs::copy(symlink, dest, copy_options::copy_symlinks, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(exists(dest));
-        TEST_CHECK(is_symlink(dest));
+        assert(!ec);
+        assert(exists(dest));
+        assert(is_symlink(dest));
     }
     { // copy symlink but target exists
         std::error_code ec = GetTestEC();
         fs::copy(symlink, file, copy_options::copy_symlinks, ec);
-        TEST_CHECK(ec);
-        TEST_CHECK(ec != GetTestEC());
+        assert(ec);
+        assert(ec != GetTestEC());
     }
     { // create symlinks but target exists
         std::error_code ec = GetTestEC();
         fs::copy(symlink, file, copy_options::create_symlinks, ec);
-        TEST_CHECK(ec);
-        TEST_CHECK(ec != GetTestEC());
+        assert(ec);
+        assert(ec != GetTestEC());
     }
 }
 
-TEST_CASE(from_is_regular_file)
+static void from_is_regular_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
@@ -160,44 +157,44 @@
         const path dest = env.make_env_path("dest1");
         std::error_code ec = GetTestEC();
         fs::copy(file, dest, CO::directories_only, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(dest));
+        assert(!ec);
+        assert(!exists(dest));
     }
     { // create symlink to file
         const path dest = env.make_env_path("sym");
         std::error_code ec = GetTestEC();
         fs::copy(file, dest, CO::create_symlinks, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(is_symlink(dest));
-        TEST_CHECK(equivalent(file, canonical(dest)));
+        assert(!ec);
+        assert(is_symlink(dest));
+        assert(equivalent(file, canonical(dest)));
     }
     { // create hard link to file
         const path dest = env.make_env_path("hardlink");
-        TEST_CHECK(hard_link_count(file) == 1);
+        assert(hard_link_count(file) == 1);
         std::error_code ec = GetTestEC();
         fs::copy(file, dest, CO::create_hard_links, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(exists(dest));
-        TEST_CHECK(hard_link_count(file) == 2);
+        assert(!ec);
+        assert(exists(dest));
+        assert(hard_link_count(file) == 2);
     }
     { // is_directory(t)
         const path dest_dir = env.create_dir("dest_dir");
         const path expect_dest = dest_dir / file.filename();
         std::error_code ec = GetTestEC();
         fs::copy(file, dest_dir, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(is_regular_file(expect_dest));
+        assert(!ec);
+        assert(is_regular_file(expect_dest));
     }
     { // otherwise copy_file(from, to, ...)
         const path dest = env.make_env_path("file_copy");
         std::error_code ec = GetTestEC();
         fs::copy(file, dest, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(is_regular_file(dest));
+        assert(!ec);
+        assert(is_regular_file(dest));
     }
 }
 
-TEST_CASE(from_is_directory)
+static void from_is_directory()
 {
     struct FileInfo {
         path filename;
@@ -221,48 +218,48 @@
         const path dest = env.make_env_path("dest_dir1");
         std::error_code ec = GetTestEC();
         fs::copy(dir, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_directory(dest));
+        assert(!ec);
+        assert(is_directory(dest));
         for (auto& FI : files) {
             path created = dest / FI.filename;
-            TEST_CHECK(is_regular_file(created));
-            TEST_CHECK(file_size(created) == FI.size);
+            assert(is_regular_file(created));
+            assert(file_size(created) == FI.size);
         }
-        TEST_CHECK(!is_directory(dest / nested_dir_name));
+        assert(!is_directory(dest / nested_dir_name));
     }
     { // test for existing directory
         const path dest = env.create_dir("dest_dir2");
         std::error_code ec = GetTestEC();
         fs::copy(dir, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_directory(dest));
+        assert(!ec);
+        assert(is_directory(dest));
         for (auto& FI : files) {
             path created = dest / FI.filename;
-            TEST_CHECK(is_regular_file(created));
-            TEST_CHECK(file_size(created) == FI.size);
+            assert(is_regular_file(created));
+            assert(file_size(created) == FI.size);
         }
-        TEST_CHECK(!is_directory(dest / nested_dir_name));
+        assert(!is_directory(dest / nested_dir_name));
     }
     { // test recursive copy
         const path dest = env.make_env_path("dest_dir3");
         std::error_code ec = GetTestEC();
         fs::copy(dir, dest, CO::recursive, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_directory(dest));
+        assert(!ec);
+        assert(is_directory(dest));
         const path nested_dest = dest / nested_dir_name;
-        TEST_REQUIRE(is_directory(nested_dest));
+        assert(is_directory(nested_dest));
         for (auto& FI : files) {
             path created = dest / FI.filename;
             path nested_created = nested_dest / FI.filename;
-            TEST_CHECK(is_regular_file(created));
-            TEST_CHECK(file_size(created) == FI.size);
-            TEST_CHECK(is_regular_file(nested_created));
-            TEST_CHECK(file_size(nested_created) == FI.size);
+            assert(is_regular_file(created));
+            assert(file_size(created) == FI.size);
+            assert(is_regular_file(nested_created));
+            assert(file_size(nested_created) == FI.size);
         }
     }
 }
 
-TEST_CASE(test_copy_symlinks_to_symlink_dir)
+static void test_copy_symlinks_to_symlink_dir()
 {
     scoped_test_env env;
     const path file1 = env.create_file("file1", 42);
@@ -273,16 +270,16 @@
     {
         std::error_code ec = GetTestEC();
         fs::copy(file1, dir_sym, copy_options::copy_symlinks, ec);
-        TEST_CHECK(!ec);
+        assert(!ec);
         const path dest = env.make_env_path("dir/file1");
-        TEST_CHECK(exists(dest));
-        TEST_CHECK(!is_symlink(dest));
-        TEST_CHECK(file_size(dest) == 42);
+        assert(exists(dest));
+        assert(!is_symlink(dest));
+        assert(file_size(dest) == 42);
     }
 }
 
 
-TEST_CASE(test_dir_create_symlink)
+static void test_dir_create_symlink()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir1");
@@ -290,20 +287,20 @@
     {
         std::error_code ec = GetTestEC();
         fs::copy(dir, dest, copy_options::create_symlinks, ec);
-        TEST_CHECK(ErrorIs(ec, std::errc::is_a_directory));
-        TEST_CHECK(!exists(dest));
-        TEST_CHECK(!is_symlink(dest));
+        assert(ErrorIs(ec, std::errc::is_a_directory));
+        assert(!exists(dest));
+        assert(!is_symlink(dest));
     }
     {
         std::error_code ec = GetTestEC();
         fs::copy(dir, dest, copy_options::create_symlinks|copy_options::recursive, ec);
-        TEST_CHECK(ErrorIs(ec, std::errc::is_a_directory));
-        TEST_CHECK(!exists(dest));
-        TEST_CHECK(!is_symlink(dest));
+        assert(ErrorIs(ec, std::errc::is_a_directory));
+        assert(!exists(dest));
+        assert(!is_symlink(dest));
     }
 }
 
-TEST_CASE(test_otherwise_no_effects_clause)
+static void test_otherwise_no_effects_clause()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir1");
@@ -311,9 +308,20 @@
         const path dest = env.make_env_path("dest1");
         std::error_code ec;
         fs::copy(dir, dest, CO::directories_only, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(dest));
+        assert(!ec);
+        assert(!exists(dest));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    test_error_reporting();
+    from_is_symlink();
+    from_is_regular_file();
+    from_is_directory();
+    test_copy_symlinks_to_symlink_dir();
+    test_dir_create_symlink();
+    test_otherwise_no_effects_clause();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
index 85e8416..06d2c0b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -25,17 +25,15 @@
 #include <chrono>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
 using CO = fs::copy_options;
 
-TEST_SUITE(filesystem_copy_file_test_suite)
-
-TEST_CASE(test_signatures) {
+static void test_signatures() {
   const path p;
   ((void)p);
   const copy_options opts{};
@@ -52,7 +50,7 @@
   ASSERT_NOT_NOEXCEPT(fs::copy_file(p, p, opts, ec));
 }
 
-TEST_CASE(test_error_reporting) {
+static void test_error_reporting() {
 
   scoped_test_env env;
   const path file = env.create_file("file1", 42);
@@ -60,25 +58,25 @@
 
   { // exists(to) && equivalent(to, from)
     std::error_code ec;
-    TEST_CHECK(fs::copy_file(file, file, copy_options::overwrite_existing,
+    assert(fs::copy_file(file, file, copy_options::overwrite_existing,
                              ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::file_exists));
+    assert(ErrorIs(ec, std::errc::file_exists));
     ExceptionChecker Checker(file, file, std::errc::file_exists, "copy_file");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, copy_file(file, file, copy_options::overwrite_existing));
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, copy_file(file, file, copy_options::overwrite_existing));
 
   }
   { // exists(to) && !(skip_existing | overwrite_existing | update_existing)
     std::error_code ec;
-    TEST_CHECK(fs::copy_file(file, file2, ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::file_exists));
+    assert(fs::copy_file(file, file2, ec) == false);
+    assert(ErrorIs(ec, std::errc::file_exists));
     ExceptionChecker Checker(file, file, std::errc::file_exists, "copy_file");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, copy_file(file, file, copy_options::overwrite_existing));
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, copy_file(file, file, copy_options::overwrite_existing));
 
   }
 }
 
 #ifndef _WIN32
-TEST_CASE(non_regular_file_test) {
+static void non_regular_file_test() {
   scoped_test_env env;
   const path fifo = env.create_fifo("fifo");
   const path dest = env.make_env_path("dest");
@@ -86,22 +84,22 @@
 
   {
     std::error_code ec = GetTestEC();
-    TEST_REQUIRE(fs::copy_file(fifo, dest, ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_supported));
-    TEST_CHECK(!exists(dest));
+    assert(fs::copy_file(fifo, dest, ec) == false);
+    assert(ErrorIs(ec, std::errc::not_supported));
+    assert(!exists(dest));
   }
   {
     std::error_code ec = GetTestEC();
-    TEST_REQUIRE(fs::copy_file(file, fifo, copy_options::overwrite_existing,
+    assert(fs::copy_file(file, fifo, copy_options::overwrite_existing,
                                ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_supported));
-    TEST_CHECK(is_fifo(fifo));
+    assert(ErrorIs(ec, std::errc::not_supported));
+    assert(is_fifo(fifo));
   }
 
 }
-#endif
+#endif // _WIN32
 
-TEST_CASE(test_attributes_get_copied) {
+static void test_attributes_get_copied() {
   scoped_test_env env;
   const path file = env.create_file("file1", 42);
   const path dest = env.make_env_path("file2");
@@ -109,27 +107,27 @@
   perms new_perms = perms::owner_read;
   permissions(file, new_perms);
   std::error_code ec = GetTestEC();
-  TEST_REQUIRE(fs::copy_file(file, dest, ec) == true);
-  TEST_CHECK(!ec);
+  assert(fs::copy_file(file, dest, ec) == true);
+  assert(!ec);
   auto new_st = status(dest);
-  TEST_CHECK(new_st.permissions() == NormalizeExpectedPerms(new_perms));
+  assert(new_st.permissions() == NormalizeExpectedPerms(new_perms));
 }
 
-TEST_CASE(copy_dir_test) {
+static void copy_dir_test() {
   scoped_test_env env;
   const path file = env.create_file("file1", 42);
   const path dest = env.create_dir("dir1");
   std::error_code ec = GetTestEC();
-  TEST_CHECK(fs::copy_file(file, dest, ec) == false);
-  TEST_CHECK(ec);
-  TEST_CHECK(ec != GetTestEC());
+  assert(fs::copy_file(file, dest, ec) == false);
+  assert(ec);
+  assert(ec != GetTestEC());
   ec = GetTestEC();
-  TEST_CHECK(fs::copy_file(dest, file, ec) == false);
-  TEST_CHECK(ec);
-  TEST_CHECK(ec != GetTestEC());
+  assert(fs::copy_file(dest, file, ec) == false);
+  assert(ec);
+  assert(ec != GetTestEC());
 }
 
-TEST_CASE(copy_file) {
+static void copy_file() {
   scoped_test_env env;
   const path file = env.create_file("file1", 42);
 
@@ -137,9 +135,9 @@
     const path dest = env.make_env_path("dest1");
     std::error_code ec = GetTestEC();
 
-    TEST_REQUIRE(fs::copy_file(file, dest, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(file_size(dest) == 42);
+    assert(fs::copy_file(file, dest, ec) == true);
+    assert(!ec);
+    assert(file_size(dest) == 42);
   }
   { // exists(to) && overwrite_existing
     const path dest = env.create_file("dest2", 55);
@@ -149,11 +147,11 @@
                 perm_options::remove);
 
     std::error_code ec = GetTestEC();
-    TEST_REQUIRE(fs::copy_file(file, dest, copy_options::overwrite_existing,
+    assert(fs::copy_file(file, dest, copy_options::overwrite_existing,
                                ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(file_size(dest) == 42);
-    TEST_CHECK(status(dest).permissions() == status(file).permissions());
+    assert(!ec);
+    assert(file_size(dest) == 42);
+    assert(status(dest).permissions() == status(file).permissions());
   }
   { // exists(to) && update_existing
     using Sec = std::chrono::seconds;
@@ -166,25 +164,35 @@
     const path newer = env.create_file("newer_file", 2);
 
     std::error_code ec = GetTestEC();
-    TEST_REQUIRE(
+    assert(
         fs::copy_file(from, older, copy_options::update_existing, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(file_size(older) == 55);
+    assert(!ec);
+    assert(file_size(older) == 55);
 
-    TEST_REQUIRE(
+    assert(
         fs::copy_file(from, newer, copy_options::update_existing, ec) == false);
-    TEST_CHECK(!ec);
-    TEST_CHECK(file_size(newer) == 2);
+    assert(!ec);
+    assert(file_size(newer) == 2);
   }
   { // skip_existing
     const path file2 = env.create_file("file2", 55);
     std::error_code ec = GetTestEC();
-    TEST_REQUIRE(fs::copy_file(file, file2, copy_options::skip_existing, ec) ==
+    assert(fs::copy_file(file, file2, copy_options::skip_existing, ec) ==
                  false);
-    TEST_CHECK(!ec);
-    TEST_CHECK(file_size(file2) == 55);
+    assert(!ec);
+    assert(file_size(file2) == 55);
   }
 }
 
+int main(int, char**) {
+  test_signatures();
+  test_error_reporting();
+#ifndef _WIN32
+  non_regular_file_test();
+#endif
+  test_attributes_get_copied();
+  copy_dir_test();
+  copy_file();
 
-TEST_SUITE_END()
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
index dd38b1e..31d43eb 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
@@ -23,22 +23,19 @@
 #include <string>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_copy_file_test_suite)
-
 // This test is intended to test 'sendfile's 2gb limit for a single call, and
 // to ensure that libc++ correctly copies files larger than that limit.
 // However it requires allocating ~5GB of filesystem space. This might not
 // be acceptable on all systems.
-TEST_CASE(large_file) {
+static void large_file() {
   using namespace fs;
-  constexpr uintmax_t sendfile_size_limit = 2147479552ull;
-  constexpr uintmax_t additional_size = 1024;
-  constexpr uintmax_t test_file_size = sendfile_size_limit + additional_size;
+  constexpr std::uintmax_t sendfile_size_limit = 2147479552ull;
+  constexpr std::uintmax_t additional_size = 1024;
+  constexpr std::uintmax_t test_file_size = sendfile_size_limit + additional_size;
   static_assert(test_file_size > sendfile_size_limit, "");
 
   scoped_test_env env;
@@ -46,7 +43,7 @@
   // Check that we have more than sufficient room to create the files needed
   // to perform the test.
   if (space(env.test_root).available < 3 * test_file_size) {
-    TEST_UNSUPPORTED();
+    return;
   }
 
   // Create a file right at the size limit. The file is full of '\0's.
@@ -55,32 +52,36 @@
   // Append known data to the end of the source file.
   {
     std::FILE* outf = std::fopen(source.string().c_str(), "a");
-    TEST_REQUIRE(outf != nullptr);
+    assert(outf != nullptr);
     std::fputs(additional_data.c_str(), outf);
     std::fclose(outf);
   }
-  TEST_REQUIRE(file_size(source) == test_file_size);
+  assert(file_size(source) == test_file_size);
   const path dest = env.make_env_path("dest");
 
   std::error_code ec = GetTestEC();
-  TEST_CHECK(copy_file(source, dest, ec));
-  TEST_CHECK(!ec);
+  assert(copy_file(source, dest, ec));
+  assert(!ec);
 
-  TEST_REQUIRE(is_regular_file(dest));
-  TEST_CHECK(file_size(dest) == test_file_size);
+  assert(is_regular_file(dest));
+  assert(file_size(dest) == test_file_size);
 
   // Read the data from the end of the destination file, and ensure it matches
   // the data at the end of the source file.
   std::string out_data(additional_size, 'z');
   {
     std::FILE* dest_file = std::fopen(dest.string().c_str(), "rb");
-    TEST_REQUIRE(dest_file != nullptr);
-    TEST_REQUIRE(std::fseek(dest_file, sendfile_size_limit, SEEK_SET) == 0);
-    TEST_REQUIRE(std::fread(&out_data[0], sizeof(out_data[0]), additional_size, dest_file) == additional_size);
+    assert(dest_file != nullptr);
+    assert(std::fseek(dest_file, sendfile_size_limit, SEEK_SET) == 0);
+    assert(std::fread(&out_data[0], sizeof(out_data[0]), additional_size, dest_file) == additional_size);
     std::fclose(dest_file);
   }
-  TEST_CHECK(out_data.size() == additional_data.size());
-  TEST_CHECK(out_data == additional_data);
+  assert(out_data.size() == additional_data.size());
+  assert(out_data == additional_data);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  large_file();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
index fff62c3..c618acf 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
@@ -19,14 +19,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_copy_symlink_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -35,7 +32,7 @@
 }
 
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, path const& t, const std::error_code& ec)
     {
@@ -62,23 +59,23 @@
     { // from is a file, not a symlink
         std::error_code ec;
         fs::copy_symlink(file, dne, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(checkThrow(file, dne, ec));
+        assert(ec);
+        assert(checkThrow(file, dne, ec));
     }
     { // from is a file, not a symlink
         std::error_code ec;
         fs::copy_symlink(dir, dne, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(checkThrow(dir, dne, ec));
+        assert(ec);
+        assert(checkThrow(dir, dne, ec));
     }
     { // destination exists
         std::error_code ec;
         fs::copy_symlink(sym, file2, ec);
-        TEST_REQUIRE(ec);
+        assert(ec);
     }
 }
 
-TEST_CASE(copy_symlink_basic)
+static void copy_symlink_basic()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -89,19 +86,24 @@
         const path dest = env.make_env_path("dest1");
         std::error_code ec;
         fs::copy_symlink(dir_sym, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_symlink(dest));
-        TEST_CHECK(equivalent(dest, dir));
+        assert(!ec);
+        assert(is_symlink(dest));
+        assert(equivalent(dest, dir));
     }
     { // test for file symlinks
         const path dest = env.make_env_path("dest2");
         std::error_code ec;
         fs::copy_symlink(file_sym, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_symlink(dest));
-        TEST_CHECK(equivalent(dest, file));
+        assert(!ec);
+        assert(is_symlink(dest));
+        assert(equivalent(dest, file));
     }
 }
 
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    copy_symlink_basic();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
index f3c22c8..ecc68e8 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03
 
 // This test requires the dylib support introduced in D92769.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -20,15 +20,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_create_directories_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -38,37 +36,37 @@
     ASSERT_NOT_NOEXCEPT(fs::create_directories(p, ec));
 }
 
-TEST_CASE(create_existing_directory)
+static void create_existing_directory()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir1");
     std::error_code ec;
-    TEST_CHECK(fs::create_directories(dir, ec) == false);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directories(dir, ec) == false);
+    assert(!ec);
+    assert(is_directory(dir));
 }
 
-TEST_CASE(create_directory_one_level)
+static void create_directory_one_level()
 {
     scoped_test_env env;
     const path dir = env.make_env_path("dir1");
     std::error_code ec;
-    TEST_CHECK(fs::create_directories(dir, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directories(dir, ec) == true);
+    assert(!ec);
+    assert(is_directory(dir));
 }
 
-TEST_CASE(create_directories_multi_level)
+static void create_directories_multi_level()
 {
     scoped_test_env env;
     const path dir = env.make_env_path("dir1/dir2/dir3");
     std::error_code ec;
-    TEST_CHECK(fs::create_directories(dir, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directories(dir, ec) == true);
+    assert(!ec);
+    assert(is_directory(dir));
 }
 
-TEST_CASE(create_directory_symlinks) {
+static void create_directory_symlinks() {
   scoped_test_env env;
   const path root = env.create_dir("dir");
   const path sym_dest_dead = env.make_env_path("dead");
@@ -76,82 +74,82 @@
   const path target = env.make_env_path("dir/sym_dir/foo");
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directories(target, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::file_exists));
-    TEST_CHECK(!exists(sym_dest_dead));
-    TEST_CHECK(!exists(dead_sym));
+    assert(create_directories(target, ec) == false);
+    assert(ec);
+    assert(ErrorIs(ec, std::errc::file_exists));
+    assert(!exists(sym_dest_dead));
+    assert(!exists(dead_sym));
   }
 }
 
-TEST_CASE(create_directory_through_symlinks) {
+static void create_directory_through_symlinks() {
   scoped_test_env env;
   const path root = env.create_dir("dir");
   const path sym_dir = env.create_directory_symlink(root, "sym_dir");
   const path target = env.make_env_path("sym_dir/foo");
   const path resolved_target = env.make_env_path("dir/foo");
-  TEST_REQUIRE(is_directory(sym_dir));
+  assert(is_directory(sym_dir));
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directories(target, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(target));
-    TEST_CHECK(is_directory(resolved_target));
+    assert(create_directories(target, ec) == true);
+    assert(!ec);
+    assert(is_directory(target));
+    assert(is_directory(resolved_target));
   }
 }
 
-TEST_CASE(dest_is_file)
+static void dest_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directories(file, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::file_exists));
-    TEST_CHECK(is_regular_file(file));
+    assert(fs::create_directories(file, ec) == false);
+    assert(ec);
+    assert(ErrorIs(ec, std::errc::file_exists));
+    assert(is_regular_file(file));
 }
 
-TEST_CASE(dest_part_is_file)
+static void dest_part_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file");
     const path dir = env.make_env_path("file/dir1");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directories(dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_a_directory));
-    TEST_CHECK(is_regular_file(file));
-    TEST_CHECK(!exists(dir));
+    assert(fs::create_directories(dir, ec) == false);
+    assert(ec);
+    assert(ErrorIs(ec, std::errc::not_a_directory));
+    assert(is_regular_file(file));
+    assert(!exists(dir));
 }
 
-TEST_CASE(dest_final_part_is_file)
+static void dest_final_part_is_file()
 {
     scoped_test_env env;
     env.create_dir("dir");
     const path file = env.create_file("dir/file");
     const path dir = env.make_env_path("dir/file/dir1");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directories(dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_a_directory));
-    TEST_CHECK(is_regular_file(file));
-    TEST_CHECK(!exists(dir));
+    assert(fs::create_directories(dir, ec) == false);
+    assert(ec);
+    assert(ErrorIs(ec, std::errc::not_a_directory));
+    assert(is_regular_file(file));
+    assert(!exists(dir));
 }
 
-TEST_CASE(dest_is_empty_path)
+static void dest_is_empty_path()
 {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directories(fs::path{}, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(fs::create_directories(fs::path{}, ec) == false);
+    assert(ec);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
     ExceptionChecker Checker(path{}, std::errc::no_such_file_or_directory,
                              "create_directories");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker,
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker,
                             fs::create_directories(path{}));
 }
 
 #ifdef _WIN32
-TEST_CASE(nonexistent_root)
+static void nonexistent_root()
 {
     std::error_code ec = GetTestEC();
     // If Q:\ doesn't exist, create_directories would try to recurse upwards
@@ -159,9 +157,25 @@
     // whole path is the root name, parent_path() returns itself, and it
     // would recurse indefinitely, unless the recursion is broken.
     if (!exists("Q:\\"))
-       TEST_CHECK(fs::create_directories("Q:\\", ec) == false);
-    TEST_CHECK(fs::create_directories("\\\\nonexistentserver", ec) == false);
+       assert(fs::create_directories("Q:\\", ec) == false);
+    assert(fs::create_directories("\\\\nonexistentserver", ec) == false);
 }
+#endif // _WIN32
+
+int main(int, char**) {
+    test_signatures();
+    create_existing_directory();
+    create_directory_one_level();
+    create_directories_multi_level();
+    create_directory_symlinks();
+    create_directory_through_symlinks();
+    dest_is_file();
+    dest_part_is_file();
+    dest_final_part_is_file();
+    dest_is_empty_path();
+#ifdef _WIN32
+    nonexistent_root();
 #endif
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
index cf7e64c..daa160b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03
 
 // This test requires the dylib support introduced in http://llvm.org/D92769.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -23,7 +23,6 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 #include <sys/types.h>
@@ -37,9 +36,7 @@
     return static_cast<fs::perms>(old_mask);
 }
 
-TEST_SUITE(filesystem_create_directory_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -54,84 +51,95 @@
 }
 
 
-TEST_CASE(create_existing_directory)
+static void create_existing_directory()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir1");
     std::error_code ec;
-    TEST_CHECK(fs::create_directory(dir, ec) == false);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directory(dir, ec) == false);
+    assert(!ec);
+    assert(is_directory(dir));
     // Test throwing version
-    TEST_CHECK(fs::create_directory(dir) == false);
+    assert(fs::create_directory(dir) == false);
 }
 
-TEST_CASE(create_directory_one_level)
+static void create_directory_one_level()
 {
     scoped_test_env env;
     const path dir = env.make_env_path("dir1");
     std::error_code ec;
-    TEST_CHECK(fs::create_directory(dir, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directory(dir, ec) == true);
+    assert(!ec);
+    assert(is_directory(dir));
 
     auto st = status(dir);
     const perms expect_perms = perms::all & ~(read_umask());
-    TEST_CHECK((st.permissions() & perms::all) == expect_perms);
+    assert((st.permissions() & perms::all) == expect_perms);
 }
 
-TEST_CASE(create_directory_multi_level)
+static void create_directory_multi_level()
 {
     scoped_test_env env;
     const path dir = env.make_env_path("dir1/dir2");
     const path dir1 = env.make_env_path("dir1");
     std::error_code ec;
-    TEST_CHECK(fs::create_directory(dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(!is_directory(dir));
-    TEST_CHECK(!is_directory(dir1));
+    assert(fs::create_directory(dir, ec) == false);
+    assert(ec);
+    assert(!is_directory(dir));
+    assert(!is_directory(dir1));
 }
 
-TEST_CASE(dest_is_file)
+static void dest_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directory(file, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(is_regular_file(file));
+    assert(fs::create_directory(file, ec) == false);
+    assert(ec);
+    assert(is_regular_file(file));
 }
 
-TEST_CASE(dest_part_is_file)
+static void dest_part_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file");
     const path dir = env.make_env_path("file/dir1");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directory(dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(is_regular_file(file));
-    TEST_CHECK(!exists(dir));
+    assert(fs::create_directory(dir, ec) == false);
+    assert(ec);
+    assert(is_regular_file(file));
+    assert(!exists(dir));
 }
 
-TEST_CASE(dest_is_symlink_to_dir)
+static void dest_is_symlink_to_dir()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
     const path sym = env.create_directory_symlink(dir, "sym_name");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(sym, ec) == false);
-    TEST_CHECK(!ec);
+    assert(create_directory(sym, ec) == false);
+    assert(!ec);
 }
 
-TEST_CASE(dest_is_symlink_to_file)
+static void dest_is_symlink_to_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file");
     const path sym = env.create_symlink(file, "sym_name");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(sym, ec) == false);
-    TEST_CHECK(ec);
+    assert(create_directory(sym, ec) == false);
+    assert(ec);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    create_existing_directory();
+    create_directory_one_level();
+    create_directory_multi_level();
+    dest_is_file();
+    dest_part_is_file();
+    dest_is_symlink_to_dir();
+    dest_is_symlink_to_file();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
index c3ca9dd..8fbfdcf 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03
 
 // This test requires the dylib support introduced in http://llvm.org/D92769.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -21,14 +21,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_create_directory_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -38,7 +35,7 @@
     ASSERT_NOEXCEPT(fs::create_directory(p, p, ec));
 }
 
-TEST_CASE(create_existing_directory)
+static void create_existing_directory()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir1");
@@ -48,19 +45,19 @@
     permissions(dir2, perms::none);
 
     std::error_code ec;
-    TEST_CHECK(fs::create_directory(dir, dir2, ec) == false);
-    TEST_CHECK(!ec);
+    assert(fs::create_directory(dir, dir2, ec) == false);
+    assert(!ec);
 
     // Check that the permissions were unchanged
-    TEST_CHECK(orig_p == status(dir).permissions());
+    assert(orig_p == status(dir).permissions());
 
     // Test throwing version
-    TEST_CHECK(fs::create_directory(dir, dir2) == false);
+    assert(fs::create_directory(dir, dir2) == false);
 }
 
 // Windows doesn't have the concept of perms::none on directories.
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-TEST_CASE(create_directory_one_level)
+static void create_directory_one_level()
 {
     scoped_test_env env;
     // Remove setgid which mkdir would inherit
@@ -71,104 +68,119 @@
     permissions(attr_dir, perms::none);
 
     std::error_code ec;
-    TEST_CHECK(fs::create_directory(dir, attr_dir, ec) == true);
-    TEST_CHECK(!ec);
-    TEST_CHECK(is_directory(dir));
+    assert(fs::create_directory(dir, attr_dir, ec) == true);
+    assert(!ec);
+    assert(is_directory(dir));
 
     // Check that the new directory has the same permissions as attr_dir
     auto st = status(dir);
-    TEST_CHECK(st.permissions() == perms::none);
+    assert(st.permissions() == perms::none);
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
-TEST_CASE(create_directory_multi_level)
+static void create_directory_multi_level()
 {
     scoped_test_env env;
     const path dir = env.make_env_path("dir1/dir2");
     const path dir1 = env.make_env_path("dir1");
     const path attr_dir = env.create_dir("attr_dir");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directory(dir, attr_dir, ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
-    TEST_CHECK(!is_directory(dir));
-    TEST_CHECK(!is_directory(dir1));
+    assert(fs::create_directory(dir, attr_dir, ec) == false);
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(!is_directory(dir));
+    assert(!is_directory(dir1));
 }
 
-TEST_CASE(dest_is_file)
+static void dest_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
     const path attr_dir = env.create_dir("attr_dir");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directory(file, attr_dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(is_regular_file(file));
+    assert(fs::create_directory(file, attr_dir, ec) == false);
+    assert(ec);
+    assert(is_regular_file(file));
 }
 
-TEST_CASE(dest_part_is_file)
+static void dest_part_is_file()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
     const path dir = env.make_env_path("file/dir1");
     const path attr_dir = env.create_dir("attr_dir");
     std::error_code ec = GetTestEC();
-    TEST_CHECK(fs::create_directory(dir, attr_dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(is_regular_file(file));
-    TEST_CHECK(!exists(dir));
+    assert(fs::create_directory(dir, attr_dir, ec) == false);
+    assert(ec);
+    assert(is_regular_file(file));
+    assert(!exists(dir));
 }
 
-TEST_CASE(attr_dir_is_invalid) {
+static void attr_dir_is_invalid() {
   scoped_test_env env;
   const path file = env.create_file("file", 42);
   const path dest = env.make_env_path("dir");
   const path dne = env.make_env_path("dne");
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(dest, file, ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_a_directory));
+    assert(create_directory(dest, file, ec) == false);
+    assert(ErrorIs(ec, std::errc::not_a_directory));
   }
-  TEST_REQUIRE(!exists(dest));
+  assert(!exists(dest));
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(dest, dne, ec) == false);
-    TEST_CHECK(ErrorIs(ec, std::errc::not_a_directory));
+    assert(create_directory(dest, dne, ec) == false);
+    assert(ErrorIs(ec, std::errc::not_a_directory));
   }
 }
 
-TEST_CASE(dest_is_symlink_to_unexisting) {
+static void dest_is_symlink_to_unexisting() {
   scoped_test_env env;
   const path attr_dir = env.create_dir("attr_dir");
   const path sym = env.create_symlink("dne_sym", "dne_sym_name");
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(sym, attr_dir, ec) == false);
-    TEST_CHECK(ec);
+    assert(create_directory(sym, attr_dir, ec) == false);
+    assert(ec);
   }
 }
 
-TEST_CASE(dest_is_symlink_to_dir) {
+static void dest_is_symlink_to_dir() {
   scoped_test_env env;
   const path dir = env.create_dir("dir");
   const path sym = env.create_directory_symlink(dir, "sym_name");
   const path attr_dir = env.create_dir("attr_dir");
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(sym, attr_dir, ec) == false);
-    TEST_CHECK(!ec);
+    assert(create_directory(sym, attr_dir, ec) == false);
+    assert(!ec);
   }
 }
 
-TEST_CASE(dest_is_symlink_to_file) {
+static void dest_is_symlink_to_file() {
   scoped_test_env env;
   const path file = env.create_file("file");
   const path sym = env.create_symlink(file, "sym_name");
   const path attr_dir = env.create_dir("attr_dir");
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(create_directory(sym, attr_dir, ec) == false);
-    TEST_CHECK(ec);
+    assert(create_directory(sym, attr_dir, ec) == false);
+    assert(ec);
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_signatures();
+  create_existing_directory();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+  create_directory_one_level();
+#endif
+  create_directory_multi_level();
+  dest_is_file();
+  dest_part_is_file();
+  attr_dir_is_invalid();
+  dest_is_symlink_to_unexisting();
+  dest_is_symlink_to_dir();
+  dest_is_symlink_to_file();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
index 2b6467b..cd8d053 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
@@ -18,14 +18,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_create_directory_symlink_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -33,7 +30,7 @@
     ASSERT_NOEXCEPT(fs::create_directory_symlink(p, p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     scoped_test_env env;
     const path file = env.create_file("file1", 42);
@@ -42,11 +39,11 @@
     { // destination exists
         std::error_code ec;
         fs::create_directory_symlink(sym, file2, ec);
-        TEST_REQUIRE(ec);
+        assert(ec);
     }
 }
 
-TEST_CASE(create_directory_symlink_basic)
+static void create_directory_symlink_basic()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -55,10 +52,15 @@
     const path dest = env.make_env_path("dest1");
     std::error_code ec;
     fs::create_directory_symlink(dir_sym, dest, ec);
-    TEST_REQUIRE(!ec);
-    TEST_CHECK(is_symlink(dest));
-    TEST_CHECK(equivalent(dest, dir));
+    assert(!ec);
+    assert(is_symlink(dest));
+    assert(equivalent(dest, dir));
 }
 
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    create_directory_symlink_basic();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
index c6785e6..5145cd4 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
@@ -17,14 +17,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_create_hard_link_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -32,7 +29,7 @@
     ASSERT_NOEXCEPT(fs::create_hard_link(p, p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     scoped_test_env env;
     const path file = env.create_file("file1", 42);
@@ -41,25 +38,25 @@
     { // destination exists
         std::error_code ec;
         fs::create_hard_link(sym, file2, ec);
-        TEST_REQUIRE(ec);
+        assert(ec);
     }
 }
 
-TEST_CASE(create_file_hard_link)
+static void create_file_hard_link()
 {
     scoped_test_env env;
     const path file = env.create_file("file");
     const path dest = env.make_env_path("dest1");
     std::error_code ec;
-    TEST_CHECK(hard_link_count(file) == 1);
+    assert(hard_link_count(file) == 1);
     fs::create_hard_link(file, dest, ec);
-    TEST_REQUIRE(!ec);
-    TEST_CHECK(exists(dest));
-    TEST_CHECK(equivalent(dest, file));
-    TEST_CHECK(hard_link_count(file) == 2);
+    assert(!ec);
+    assert(exists(dest));
+    assert(equivalent(dest, file));
+    assert(hard_link_count(file) == 2);
 }
 
-TEST_CASE(create_directory_hard_link_fails)
+static void create_directory_hard_link_fails()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -67,7 +64,14 @@
     std::error_code ec;
 
     fs::create_hard_link(dir, dest, ec);
-    TEST_REQUIRE(ec);
+    assert(ec);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    create_file_hard_link();
+    create_directory_hard_link_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
index 3b54cff..28d7f4a 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
@@ -18,14 +18,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_create_symlink_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -33,7 +30,7 @@
     ASSERT_NOEXCEPT(fs::create_symlink(p, p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     scoped_test_env env;
     const path file = env.create_file("file1", 42);
@@ -42,11 +39,11 @@
     { // destination exists
         std::error_code ec;
         fs::create_symlink(sym, file2, ec);
-        TEST_REQUIRE(ec);
+        assert(ec);
     }
 }
 
-TEST_CASE(create_symlink_basic)
+static void create_symlink_basic()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
@@ -57,21 +54,21 @@
         const path dest = env.make_env_path("dest1");
         std::error_code ec;
         fs::create_symlink(file_sym, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_symlink(dest));
-        TEST_CHECK(equivalent(dest, file));
+        assert(!ec);
+        assert(is_symlink(dest));
+        assert(equivalent(dest, file));
     }
     {
         const path dest = env.make_env_path("dest2");
         std::error_code ec;
         fs::create_directory_symlink(dir_sym, dest, ec);
-        TEST_REQUIRE(!ec);
-        TEST_CHECK(is_symlink(dest));
-        TEST_CHECK(equivalent(dest, dir));
+        assert(!ec);
+        assert(is_symlink(dest));
+        assert(equivalent(dest, dir));
     }
 }
 
-TEST_CASE(create_symlink_dest_cleanup)
+static void create_symlink_dest_cleanup()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -84,12 +81,18 @@
     sym_target_normalized.make_preferred();
     std::error_code ec;
     fs::create_symlink(sym_target, sym, ec);
-    TEST_REQUIRE(!ec);
-    TEST_CHECK(equivalent(sym, file, ec));
+    assert(!ec);
+    assert(equivalent(sym, file, ec));
     const path ret = fs::read_symlink(sym, ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(ret.native() == sym_target_normalized.native());
+    assert(!ec);
+    assert(ret.native() == sym_target_normalized.native());
 }
 
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    create_symlink_basic();
+    create_symlink_dest_cleanup();
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
index 5e90c44..981c549 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
@@ -20,14 +20,11 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_current_path_path_test_suite)
-
-TEST_CASE(current_path_signature_test)
+static void current_path_signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -37,28 +34,28 @@
     ASSERT_NOEXCEPT(current_path(p, ec));
 }
 
-TEST_CASE(current_path_test)
+static void current_path_test()
 {
     std::error_code ec;
     const path p = current_path(ec);
-    TEST_REQUIRE(!ec);
-    TEST_CHECK(p.is_absolute());
-    TEST_CHECK(is_directory(p));
+    assert(!ec);
+    assert(p.is_absolute());
+    assert(is_directory(p));
 
     const path p2 = current_path();
-    TEST_CHECK(p2 == p);
+    assert(p2 == p);
 }
 
-TEST_CASE(current_path_after_change_test)
+static void current_path_after_change_test()
 {
     static_test_env static_env;
     CWDGuard guard;
     const path new_path = static_env.Dir;
     current_path(new_path);
-    TEST_CHECK(current_path() == new_path);
+    assert(current_path() == new_path);
 }
 
-TEST_CASE(current_path_is_file_test)
+static void current_path_is_file_test()
 {
     static_test_env static_env;
     CWDGuard guard;
@@ -66,11 +63,11 @@
     std::error_code ec;
     const path old_p = current_path();
     current_path(p, ec);
-    TEST_CHECK(ec);
-    TEST_CHECK(old_p == current_path());
+    assert(ec);
+    assert(old_p == current_path());
 }
 
-TEST_CASE(set_to_non_absolute_path)
+static void set_to_non_absolute_path()
 {
     static_test_env static_env;
     CWDGuard guard;
@@ -79,20 +76,29 @@
     const path p = static_env.Dir2.filename();
     std::error_code ec;
     current_path(p, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
     const path new_cwd = current_path();
-    TEST_CHECK(new_cwd == static_env.Dir2);
-    TEST_CHECK(new_cwd.is_absolute());
+    assert(new_cwd == static_env.Dir2);
+    assert(new_cwd.is_absolute());
 }
 
-TEST_CASE(set_to_empty)
+static void set_to_empty()
 {
     const path p = "";
     std::error_code ec;
     const path old_p = current_path();
     current_path(p, ec);
-    TEST_CHECK(ec);
-    TEST_CHECK(old_p == current_path());
+    assert(ec);
+    assert(old_p == current_path());
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    current_path_signature_test();
+    current_path_test();
+    current_path_after_change_test();
+    current_path_is_file_test();
+    set_to_non_absolute_path();
+    set_to_empty();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
index 5fe8886..e9c8935 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
@@ -17,15 +17,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(equivalent_test_suite)
-
-TEST_CASE(signature_test) {
+static void signature_test() {
   const path p;
   ((void)p);
   std::error_code ec;
@@ -34,7 +32,7 @@
   ASSERT_NOT_NOEXCEPT(equivalent(p, p));
 }
 
-TEST_CASE(equivalent_test) {
+static void equivalent_test() {
   static_test_env static_env;
   struct TestCase {
     path lhs;
@@ -51,65 +49,75 @@
   };
   for (auto& TC : testCases) {
     std::error_code ec;
-    TEST_CHECK(equivalent(TC.lhs, TC.rhs, ec) == TC.expect);
-    TEST_CHECK(!ec);
+    assert(equivalent(TC.lhs, TC.rhs, ec) == TC.expect);
+    assert(!ec);
   }
 }
 
-TEST_CASE(equivalent_reports_error_if_input_dne) {
+static void equivalent_reports_error_if_input_dne() {
   static_test_env static_env;
   const path E = static_env.File;
   const path DNE = static_env.DNE;
   { // Test that an error is reported when either of the paths don't exist
     std::error_code ec = GetTestEC();
-    TEST_CHECK(equivalent(E, DNE, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ec != GetTestEC());
+    assert(equivalent(E, DNE, ec) == false);
+    assert(ec);
+    assert(ec != GetTestEC());
   }
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(equivalent(DNE, E, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ec != GetTestEC());
+    assert(equivalent(DNE, E, ec) == false);
+    assert(ec);
+    assert(ec != GetTestEC());
   }
   {
-    TEST_CHECK_THROW(filesystem_error, equivalent(DNE, E));
-    TEST_CHECK_THROW(filesystem_error, equivalent(E, DNE));
+    TEST_THROWS_TYPE(filesystem_error, equivalent(DNE, E));
+    TEST_THROWS_TYPE(filesystem_error, equivalent(E, DNE));
   }
   { // Test that an exception is thrown if both paths do not exist.
-    TEST_CHECK_THROW(filesystem_error, equivalent(DNE, DNE));
+    TEST_THROWS_TYPE(filesystem_error, equivalent(DNE, DNE));
   }
   {
     std::error_code ec = GetTestEC();
-    TEST_CHECK(equivalent(DNE, DNE, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ec != GetTestEC());
+    assert(equivalent(DNE, DNE, ec) == false);
+    assert(ec);
+    assert(ec != GetTestEC());
   }
 }
 
-TEST_CASE(equivalent_hardlink_succeeds) {
+static void equivalent_hardlink_succeeds() {
   scoped_test_env env;
   path const file = env.create_file("file", 42);
   const path hl1 = env.create_hardlink(file, "hl1");
   const path hl2 = env.create_hardlink(file, "hl2");
-  TEST_CHECK(equivalent(file, hl1));
-  TEST_CHECK(equivalent(file, hl2));
-  TEST_CHECK(equivalent(hl1, hl2));
+  assert(equivalent(file, hl1));
+  assert(equivalent(file, hl2));
+  assert(equivalent(hl1, hl2));
 }
 
 #ifndef _WIN32
-TEST_CASE(equivalent_is_other_succeeds) {
+static void equivalent_is_other_succeeds() {
   scoped_test_env env;
   path const file = env.create_file("file", 42);
   const path fifo1 = env.create_fifo("fifo1");
   const path fifo2 = env.create_fifo("fifo2");
   // Required to test behavior for inputs where is_other(p) is true.
-  TEST_REQUIRE(is_other(fifo1));
-  TEST_CHECK(!equivalent(file, fifo1));
-  TEST_CHECK(!equivalent(fifo2, file));
-  TEST_CHECK(!equivalent(fifo1, fifo2));
-  TEST_CHECK(equivalent(fifo1, fifo1));
+  assert(is_other(fifo1));
+  assert(!equivalent(file, fifo1));
+  assert(!equivalent(fifo2, file));
+  assert(!equivalent(fifo1, fifo2));
+  assert(equivalent(fifo1, fifo1));
 }
+#endif // _WIN32
+
+int main(int, char**) {
+  signature_test();
+  equivalent_test();
+  equivalent_reports_error_if_input_dne();
+  equivalent_hardlink_succeeds();
+#ifndef _WIN32
+  equivalent_is_other_succeeds();
 #endif
 
-TEST_SUITE_END()
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
index 13e8b95..c16a592 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(exists_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(exists(p));
 }
 
-TEST_CASE(exists_status_test)
+static void exists_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,33 +54,33 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(exists(s) == TC.expect);
+        assert(exists(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(exists(p) == false);
+    assert(exists(p) == false);
 
-    TEST_CHECK(exists(static_env.Dir) == true);
-    TEST_CHECK(exists(static_env.Dir / "dne") == false);
+    assert(exists(static_env.Dir) == true);
+    assert(exists(static_env.Dir / "dne") == false);
     // Whether <dir>/dne/.. is considered to exist or not is not necessarily
     // something we need to define, but the platform specific behaviour
     // does affect a few other tests, so clarify the root cause here.
 #ifdef _WIN32
-    TEST_CHECK(exists(static_env.Dir / "dne" / "..") == true);
+    assert(exists(static_env.Dir / "dne" / "..") == true);
 #else
-    TEST_CHECK(exists(static_env.Dir / "dne" / "..") == false);
+    assert(exists(static_env.Dir / "dne" / "..") == false);
 #endif
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(exists(p, ec) == false);
-    TEST_CHECK(!ec);
+    assert(exists(p, ec) == false);
+    assert(!ec);
 }
 
-TEST_CASE(test_exists_fails)
+static void test_exists_fails()
 {
 #ifdef _WIN32
     // Windows doesn't support setting perms::none to trigger failures
@@ -90,7 +88,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -99,23 +97,33 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(exists(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(exists(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, exists(p));
+    TEST_THROWS_TYPE(filesystem_error, exists(p));
 }
 
 #ifndef _WIN32
 // Checking for the existence of an invalid long path name doesn't
 // trigger errors on windows.
-TEST_CASE(test_name_too_long) {
+static void test_name_too_long() {
     std::string long_name(2500, 'a');
     const path file(long_name);
 
     std::error_code ec;
-    TEST_CHECK(exists(file, ec) == false);
-    TEST_CHECK(ec);
+    assert(exists(file, ec) == false);
+    assert(ec);
 }
+#endif // _WIN32
+
+int main(int, char**) {
+    signature_test();
+    exists_status_test();
+    test_exist_not_found();
+    test_exists_fails();
+#ifndef _WIN32
+    test_name_too_long();
 #endif
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
index 2b1cb07..8e532fd 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -21,51 +21,49 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(file_size_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
-    ASSERT_SAME_TYPE(decltype(file_size(p)), uintmax_t);
-    ASSERT_SAME_TYPE(decltype(file_size(p, ec)), uintmax_t);
+    ASSERT_SAME_TYPE(decltype(file_size(p)), std::uintmax_t);
+    ASSERT_SAME_TYPE(decltype(file_size(p, ec)), std::uintmax_t);
     ASSERT_NOT_NOEXCEPT(file_size(p));
     ASSERT_NOEXCEPT(file_size(p, ec));
 }
 
-TEST_CASE(file_size_empty_test)
+static void file_size_empty_test()
 {
     static_test_env static_env;
     const path p = static_env.EmptyFile;
-    TEST_CHECK(file_size(p) == 0);
+    assert(file_size(p) == 0);
     std::error_code ec;
-    TEST_CHECK(file_size(p, ec) == 0);
+    assert(file_size(p, ec) == 0);
 }
 
-TEST_CASE(file_size_non_empty)
+static void file_size_non_empty()
 {
     scoped_test_env env;
     const path p = env.create_file("file", 42);
-    TEST_CHECK(file_size(p) == 42);
+    assert(file_size(p) == 42);
     std::error_code ec;
-    TEST_CHECK(file_size(p, ec) == 42);
+    assert(file_size(p, ec) == 42);
 }
 
-TEST_CASE(symlink_test_case)
+static void symlink_test_case()
 {
     static_test_env static_env;
     const path p = static_env.File;
     const path p2 = static_env.SymlinkToFile;
-    TEST_CHECK(file_size(p) == file_size(p2));
+    assert(file_size(p) == file_size(p2));
 }
 
-TEST_CASE(file_size_error_cases)
+static void file_size_error_cases()
 {
   static_test_env static_env;
   struct {
@@ -77,15 +75,22 @@
       {static_env.BadSymlink, std::errc::no_such_file_or_directory},
       {static_env.DNE, std::errc::no_such_file_or_directory},
       {"", std::errc::no_such_file_or_directory}};
-    const uintmax_t expect = static_cast<uintmax_t>(-1);
+    const std::uintmax_t expect = static_cast<std::uintmax_t>(-1);
     for (auto& TC : TestCases) {
       std::error_code ec = GetTestEC();
-      TEST_CHECK(file_size(TC.p, ec) == expect);
-      TEST_CHECK(ErrorIs(ec, TC.expected_err));
+      assert(file_size(TC.p, ec) == expect);
+      assert(ErrorIs(ec, TC.expected_err));
 
       ExceptionChecker Checker(TC.p, TC.expected_err, "file_size");
-      TEST_CHECK_THROW_RESULT(filesystem_error, Checker, file_size(TC.p));
+      TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, file_size(TC.p));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    file_size_empty_test();
+    file_size_non_empty();
+    symlink_test_case();
+    file_size_error_cases();
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
index 38b2671..b646b46 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
@@ -18,38 +18,35 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(hard_link_count_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
-    ASSERT_SAME_TYPE(decltype(hard_link_count(p)), uintmax_t);
-    ASSERT_SAME_TYPE(decltype(hard_link_count(p, ec)), uintmax_t);
+    ASSERT_SAME_TYPE(decltype(hard_link_count(p)), std::uintmax_t);
+    ASSERT_SAME_TYPE(decltype(hard_link_count(p, ec)), std::uintmax_t);
     ASSERT_NOT_NOEXCEPT(hard_link_count(p));
     ASSERT_NOEXCEPT(hard_link_count(p, ec));
 }
 
-TEST_CASE(hard_link_count_for_file)
+static void hard_link_count_for_file()
 {
     static_test_env static_env;
-    TEST_CHECK(hard_link_count(static_env.File) == 1);
+    assert(hard_link_count(static_env.File) == 1);
     std::error_code ec;
-    TEST_CHECK(hard_link_count(static_env.File, ec) == 1);
+    assert(hard_link_count(static_env.File, ec) == 1);
 }
 
-TEST_CASE(hard_link_count_for_directory)
+static void hard_link_count_for_directory()
 {
     static_test_env static_env;
-    uintmax_t DirExpect = 3; // hard link from . .. and Dir2
-    uintmax_t Dir3Expect = 2; // hard link from . ..
-    uintmax_t DirExpectAlt = DirExpect;
-    uintmax_t Dir3ExpectAlt = Dir3Expect;
+    std::uintmax_t DirExpect = 3; // hard link from . .. and Dir2
+    std::uintmax_t Dir3Expect = 2; // hard link from . ..
+    std::uintmax_t DirExpectAlt = DirExpect;
+    std::uintmax_t Dir3ExpectAlt = Dir3Expect;
 #if defined(__APPLE__)
     // Filesystems formatted with case sensitive hfs+ behave unixish as
     // expected. Normal hfs+ filesystems report the number of directory
@@ -57,45 +54,54 @@
     DirExpectAlt = 5; // .  ..  Dir2  file1  file2
     Dir3Expect = 3; // .  ..  file5
 #endif
-    TEST_CHECK(hard_link_count(static_env.Dir) == DirExpect ||
+    assert(hard_link_count(static_env.Dir) == DirExpect ||
                hard_link_count(static_env.Dir) == DirExpectAlt ||
                hard_link_count(static_env.Dir) == 1);
-    TEST_CHECK(hard_link_count(static_env.Dir3) == Dir3Expect ||
+    assert(hard_link_count(static_env.Dir3) == Dir3Expect ||
                hard_link_count(static_env.Dir3) == Dir3ExpectAlt ||
                hard_link_count(static_env.Dir3) == 1);
 
     std::error_code ec;
-    TEST_CHECK(hard_link_count(static_env.Dir, ec) == DirExpect ||
+    assert(hard_link_count(static_env.Dir, ec) == DirExpect ||
                hard_link_count(static_env.Dir, ec) == DirExpectAlt ||
                hard_link_count(static_env.Dir) == 1);
-    TEST_CHECK(hard_link_count(static_env.Dir3, ec) == Dir3Expect ||
+    assert(hard_link_count(static_env.Dir3, ec) == Dir3Expect ||
                hard_link_count(static_env.Dir3, ec) == Dir3ExpectAlt ||
                hard_link_count(static_env.Dir3) == 1);
 }
-TEST_CASE(hard_link_count_increments_test)
+
+static void hard_link_count_increments_test()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
-    TEST_CHECK(hard_link_count(file) == 1);
+    assert(hard_link_count(file) == 1);
 
     env.create_hardlink(file, "file_hl");
-    TEST_CHECK(hard_link_count(file) == 2);
+    assert(hard_link_count(file) == 2);
 }
 
 
-TEST_CASE(hard_link_count_error_cases)
+static void hard_link_count_error_cases()
 {
     static_test_env static_env;
     const path testCases[] = {
         static_env.BadSymlink,
         static_env.DNE
     };
-    const uintmax_t expect = static_cast<uintmax_t>(-1);
+    const std::uintmax_t expect = static_cast<std::uintmax_t>(-1);
     for (auto& TC : testCases) {
         std::error_code ec;
-        TEST_CHECK(hard_link_count(TC, ec) == expect);
-        TEST_CHECK(ec);
+        assert(hard_link_count(TC, ec) == expect);
+        assert(ec);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    hard_link_count_for_file();
+    hard_link_count_for_directory();
+    hard_link_count_increments_test();
+    hard_link_count_error_cases();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
index d288984..3986b18 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_block_file_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_block_file(p));
 }
 
-TEST_CASE(is_block_file_status_test)
+static void is_block_file_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,18 +54,18 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_block_file(s) == TC.expect);
+        assert(is_block_file(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_block_file(p) == false);
+    assert(is_block_file(p) == false);
 }
 
-TEST_CASE(test_is_block_file_fails)
+static void test_is_block_file_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -76,7 +74,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -84,10 +82,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_block_file(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_block_file(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_block_file(p));
+    TEST_THROWS_TYPE(filesystem_error, is_block_file(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_block_file_status_test();
+    test_exist_not_found();
+    test_is_block_file_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
index 738e06c..610d97b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_character_file_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_character_file(p));
 }
 
-TEST_CASE(is_character_file_status_test)
+static void is_character_file_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,18 +54,18 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_character_file(s) == TC.expect);
+        assert(is_character_file(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_character_file(p) == false);
+    assert(is_character_file(p) == false);
 }
 
-TEST_CASE(test_is_character_file_fails)
+static void test_is_character_file_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -76,7 +74,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -84,10 +82,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_character_file(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_character_file(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_character_file(p));
+    TEST_THROWS_TYPE(filesystem_error, is_character_file(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_character_file_status_test();
+    test_exist_not_found();
+    test_is_character_file_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
index 8b1e41e..7cb297b 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_directory_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_directory(p));
 }
 
-TEST_CASE(is_directory_status_test)
+static void is_directory_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,26 +54,26 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_directory(s) == TC.expect);
+        assert(is_directory(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_directory(p) == false);
+    assert(is_directory(p) == false);
 }
 
-TEST_CASE(static_env_test)
+static void static_env_test()
 {
     static_test_env static_env;
-    TEST_CHECK(is_directory(static_env.Dir));
-    TEST_CHECK(is_directory(static_env.SymlinkToDir));
-    TEST_CHECK(!is_directory(static_env.File));
+    assert(is_directory(static_env.Dir));
+    assert(is_directory(static_env.SymlinkToDir));
+    assert(!is_directory(static_env.File));
 }
 
-TEST_CASE(test_is_directory_fails)
+static void test_is_directory_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -84,7 +82,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_dir("dir/dir2");
@@ -92,10 +90,18 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_directory(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_directory(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_directory(p));
+    TEST_THROWS_TYPE(filesystem_error, is_directory(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_directory_status_test();
+    test_exist_not_found();
+    static_env_test();
+    test_is_directory_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
index 8478037..752e682 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
@@ -17,15 +17,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_empty_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -33,39 +31,39 @@
     ASSERT_NOT_NOEXCEPT(is_empty(p));
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
     std::error_code ec;
-    TEST_CHECK(is_empty(p, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK_THROW(filesystem_error, is_empty(p));
+    assert(is_empty(p, ec) == false);
+    assert(ec);
+    TEST_THROWS_TYPE(filesystem_error, is_empty(p));
 }
 
-TEST_CASE(test_is_empty_directory)
+static void test_is_empty_directory()
 {
     static_test_env static_env;
-    TEST_CHECK(!is_empty(static_env.Dir));
-    TEST_CHECK(!is_empty(static_env.SymlinkToDir));
+    assert(!is_empty(static_env.Dir));
+    assert(!is_empty(static_env.SymlinkToDir));
 }
 
-TEST_CASE(test_is_empty_directory_dynamic)
+static void test_is_empty_directory_dynamic()
 {
     scoped_test_env env;
-    TEST_CHECK(is_empty(env.test_root));
+    assert(is_empty(env.test_root));
     env.create_file("foo", 42);
-    TEST_CHECK(!is_empty(env.test_root));
+    assert(!is_empty(env.test_root));
 }
 
-TEST_CASE(test_is_empty_file)
+static void test_is_empty_file()
 {
     static_test_env static_env;
-    TEST_CHECK(is_empty(static_env.EmptyFile));
-    TEST_CHECK(!is_empty(static_env.NonEmptyFile));
+    assert(is_empty(static_env.EmptyFile));
+    assert(!is_empty(static_env.NonEmptyFile));
 }
 
-TEST_CASE(test_is_empty_fails)
+static void test_is_empty_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -74,7 +72,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_dir("dir/dir2");
@@ -82,13 +80,13 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_empty(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_empty(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_empty(p));
+    TEST_THROWS_TYPE(filesystem_error, is_empty(p));
 }
 
-TEST_CASE(test_directory_access_denied)
+static void test_directory_access_denied()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -97,7 +95,7 @@
     // instead.
     const path dir = GetWindowsInaccessibleDir();
     if (dir.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path file1 = env.create_file("dir/file", 42);
@@ -105,27 +103,40 @@
 #endif
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(is_empty(dir, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ec != GetTestEC());
+    assert(is_empty(dir, ec) == false);
+    assert(ec);
+    assert(ec != GetTestEC());
 
-    TEST_CHECK_THROW(filesystem_error, is_empty(dir));
+    TEST_THROWS_TYPE(filesystem_error, is_empty(dir));
 }
 
 
 #ifndef _WIN32
-TEST_CASE(test_fifo_fails)
+static void test_fifo_fails()
 {
     scoped_test_env env;
     const path fifo = env.create_fifo("fifo");
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(is_empty(fifo, ec) == false);
-    TEST_CHECK(ec);
-    TEST_CHECK(ec != GetTestEC());
+    assert(is_empty(fifo, ec) == false);
+    assert(ec);
+    assert(ec != GetTestEC());
 
-    TEST_CHECK_THROW(filesystem_error, is_empty(fifo));
+    TEST_THROWS_TYPE(filesystem_error, is_empty(fifo));
 }
+#endif // _WIN32
+
+int main(int, char**) {
+    signature_test();
+    test_exist_not_found();
+    test_is_empty_directory();
+    test_is_empty_directory_dynamic();
+    test_is_empty_file();
+    test_is_empty_fails();
+    test_directory_access_denied();
+#ifndef _WIN32
+    test_fifo_fails();
 #endif
 
-TEST_SUITE_END()
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
index 0169fed..b0ef430 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_fifo_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_fifo(p));
 }
 
-TEST_CASE(is_fifo_status_test)
+static void is_fifo_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,18 +54,18 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_fifo(s) == TC.expect);
+        assert(is_fifo(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_fifo(p) == false);
+    assert(is_fifo(p) == false);
 }
 
-TEST_CASE(test_is_fifo_fails)
+static void test_is_fifo_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -76,7 +74,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -84,10 +82,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_fifo(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_fifo(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_fifo(p));
+    TEST_THROWS_TYPE(filesystem_error, is_fifo(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_fifo_status_test();
+    test_exist_not_found();
+    test_is_fifo_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
index f84eb7d..8b37190 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_other_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_other(p));
 }
 
-TEST_CASE(is_other_status_test)
+static void is_other_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,18 +54,18 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_other(s) == TC.expect);
+        assert(is_other(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_other(p) == false);
+    assert(is_other(p) == false);
 }
 
-TEST_CASE(test_is_other_fails)
+static void test_is_other_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -76,7 +74,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -84,10 +82,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_other(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_other(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_other(p));
+    TEST_THROWS_TYPE(filesystem_error, is_other(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_other_status_test();
+    test_exist_not_found();
+    test_is_other_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
index 441f15a..b32ce64 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_regular_file_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_regular_file(p));
 }
 
-TEST_CASE(is_regular_file_status_test)
+static void is_regular_file_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,21 +54,21 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_regular_file(s) == TC.expect);
+        assert(is_regular_file(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_regular_file(p) == false);
+    assert(is_regular_file(p) == false);
     std::error_code ec;
-    TEST_CHECK(is_regular_file(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_regular_file(p, ec) == false);
+    assert(ec);
 }
 
-TEST_CASE(test_is_regular_file_fails)
+static void test_is_regular_file_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -79,7 +77,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -87,10 +85,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_regular_file(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_regular_file(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_regular_file(p));
+    TEST_THROWS_TYPE(filesystem_error, is_regular_file(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_regular_file_status_test();
+    test_exist_not_found();
+    test_is_regular_file_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
index 21aa537..da5169f 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_socket_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_socket(p));
 }
 
-TEST_CASE(is_socket_status_test)
+static void is_socket_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,18 +54,18 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_socket(s) == TC.expect);
+        assert(is_socket(s) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_socket(p) == false);
+    assert(is_socket(p) == false);
 }
 
-TEST_CASE(test_is_socket_fails)
+static void test_is_socket_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -76,7 +74,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -84,10 +82,17 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_socket(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_socket(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_socket(p));
+    TEST_THROWS_TYPE(filesystem_error, is_socket(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_socket_status_test();
+    test_exist_not_found();
+    test_is_socket_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
index d8ec533..e8ee7f4 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
@@ -18,15 +18,13 @@
 #include <type_traits>
 #include <cassert>
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(is_symlink_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     const path p; ((void)p);
@@ -36,7 +34,7 @@
     ASSERT_NOT_NOEXCEPT(is_symlink(p));
 }
 
-TEST_CASE(is_symlink_status_test)
+static void is_symlink_status_test()
 {
     struct TestCase {
         file_type type;
@@ -56,11 +54,11 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(is_symlink(s) == TC.expect);
+        assert(is_symlink(s) == TC.expect);
     }
 }
 
-TEST_CASE(static_env_test)
+static void static_env_test()
 {
     static_test_env static_env;
     struct TestCase {
@@ -75,21 +73,21 @@
         {static_env.BadSymlink, true}
     };
     for (auto& TC : testCases) {
-        TEST_CHECK(is_symlink(TC.p) == TC.expect);
+        assert(is_symlink(TC.p) == TC.expect);
     }
 }
 
-TEST_CASE(test_exist_not_found)
+static void test_exist_not_found()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
-    TEST_CHECK(is_symlink(p) == false);
+    assert(is_symlink(p) == false);
     std::error_code ec;
-    TEST_CHECK(is_symlink(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_symlink(p, ec) == false);
+    assert(ec);
 }
 
-TEST_CASE(test_is_symlink_fails)
+static void test_is_symlink_fails()
 {
     scoped_test_env env;
 #ifdef _WIN32
@@ -98,7 +96,7 @@
     // instead.
     const path p = GetWindowsInaccessibleDir();
     if (p.empty())
-        TEST_UNSUPPORTED();
+        return;
 #else
     const path dir = env.create_dir("dir");
     const path p = env.create_file("dir/file", 42);
@@ -106,10 +104,18 @@
 #endif
 
     std::error_code ec;
-    TEST_CHECK(is_symlink(p, ec) == false);
-    TEST_CHECK(ec);
+    assert(is_symlink(p, ec) == false);
+    assert(ec);
 
-    TEST_CHECK_THROW(filesystem_error, is_symlink(p));
+    TEST_THROWS_TYPE(filesystem_error, is_symlink(p));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    is_symlink_status_test();
+    static_env_test();
+    test_exist_not_found();
+    test_is_symlink_fails();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
index cfff7c2..7b6bf45 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
@@ -10,7 +10,7 @@
 
 // The string reported on errors changed, which makes those tests fail when run
 // against already-released libc++'s.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}
 
 // <filesystem>
 
@@ -29,7 +29,6 @@
 #include <type_traits>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 #include <fcntl.h>
@@ -52,8 +51,8 @@
 
 #ifdef _WIN32
 struct TimeSpec {
-  int64_t tv_sec;
-  int64_t tv_nsec;
+  std::int64_t tv_sec;
+  std::int64_t tv_nsec;
 };
 struct StatT {
   TimeSpec st_atim;
@@ -61,7 +60,7 @@
 };
 // There were 369 years and 89 leap days from the Windows epoch
 // (1601) to the Unix epoch (1970).
-#define FILE_TIME_OFFSET_SECS (uint64_t(369 * 365 + 89) * (24 * 60 * 60))
+#define FILE_TIME_OFFSET_SECS (std::uint64_t(369 * 365 + 89) * (24 * 60 * 60))
 static TimeSpec filetime_to_timespec(LARGE_INTEGER li) {
   TimeSpec ret;
   ret.tv_sec = li.QuadPart / 10000000 - FILE_TIME_OFFSET_SECS;
@@ -376,9 +375,7 @@
   }
 }
 
-TEST_SUITE(last_write_time_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const file_time_type t;
     const path p; ((void)p);
@@ -393,7 +390,7 @@
     ASSERT_NOEXCEPT(last_write_time(p, t, ec));
 }
 
-TEST_CASE(read_last_write_time_static_env_test)
+static void read_last_write_time_static_env_test()
 {
     static_test_env static_env;
     using C = file_time_type::clock;
@@ -405,29 +402,28 @@
     SleepFor(MilliSec(30));
     {
         file_time_type ret = last_write_time(static_env.File);
-        TEST_CHECK(ret != min);
-        TEST_CHECK(ret < C::now());
-        TEST_CHECK(CompareTime(ret, LastWriteTime(static_env.File)));
+        assert(ret != min);
+        assert(ret < C::now());
+        assert(CompareTime(ret, LastWriteTime(static_env.File)));
 
         file_time_type ret2 = last_write_time(static_env.SymlinkToFile);
-        TEST_CHECK(CompareTime(ret, ret2));
-        TEST_CHECK(CompareTime(ret2, LastWriteTime(static_env.SymlinkToFile)));
+        assert(CompareTime(ret, ret2));
+        assert(CompareTime(ret2, LastWriteTime(static_env.SymlinkToFile)));
     }
     {
         file_time_type ret = last_write_time(static_env.Dir);
-        TEST_CHECK(ret != min);
-        TEST_CHECK(ret < C::now());
-        TEST_CHECK(CompareTime(ret, LastWriteTime(static_env.Dir)));
+        assert(ret != min);
+        assert(ret < C::now());
+        assert(CompareTime(ret, LastWriteTime(static_env.Dir)));
 
         file_time_type ret2 = last_write_time(static_env.SymlinkToDir);
-        TEST_CHECK(CompareTime(ret, ret2));
-        TEST_CHECK(CompareTime(ret2, LastWriteTime(static_env.SymlinkToDir)));
+        assert(CompareTime(ret, ret2));
+        assert(CompareTime(ret2, LastWriteTime(static_env.SymlinkToDir)));
     }
 }
 
-TEST_CASE(get_last_write_time_dynamic_env_test)
+static void get_last_write_time_dynamic_env_test()
 {
-    using Sec = std::chrono::seconds;
     scoped_test_env env;
 
     const path file = env.create_file("file", 42);
@@ -439,12 +435,12 @@
     const TimeSpec dir_write_time = dir_times.write;
 
     file_time_type ftime = last_write_time(file);
-    TEST_CHECK(CompareTime(ftime, file_write_time));
+    assert(CompareTime(ftime, file_write_time));
 
     file_time_type dtime = last_write_time(dir);
-    TEST_CHECK(CompareTime(dtime, dir_write_time));
+    assert(CompareTime(dtime, dir_write_time));
 
-    SleepFor(Sec(2));
+    SleepFor(std::chrono::seconds(2));
 
     // update file and add a file to the directory. Make sure the times increase.
     std::FILE* of = std::fopen(file.string().c_str(), "a");
@@ -455,14 +451,14 @@
     file_time_type ftime2 = last_write_time(file);
     file_time_type dtime2 = last_write_time(dir);
 
-    TEST_CHECK(ftime2 > ftime);
-    TEST_CHECK(dtime2 > dtime);
-    TEST_CHECK(CompareTime(LastWriteTime(file), ftime2));
-    TEST_CHECK(CompareTime(LastWriteTime(dir), dtime2));
+    assert(ftime2 > ftime);
+    assert(dtime2 > dtime);
+    assert(CompareTime(LastWriteTime(file), ftime2));
+    assert(CompareTime(LastWriteTime(dir), dtime2));
 }
 
 
-TEST_CASE(set_last_write_time_dynamic_env_test)
+static void set_last_write_time_dynamic_env_test()
 {
     using Clock = file_time_type::clock;
     scoped_test_env env;
@@ -513,25 +509,25 @@
     for (const auto& TC : cases) {
         const auto old_times = GetTimes(TC.p);
         file_time_type old_time;
-        TEST_REQUIRE(ConvertFromTimeSpec(old_time, old_times.write));
+        assert(ConvertFromTimeSpec(old_time, old_times.write));
 
         std::error_code ec = GetTestEC();
         last_write_time(TC.p, TC.new_time, ec);
-        TEST_CHECK(!ec);
+        assert(!ec);
 
         ec = GetTestEC();
         file_time_type  got_time = last_write_time(TC.p, ec);
-        TEST_REQUIRE(!ec);
+        assert(!ec);
 
         if (TimeIsRepresentableByFilesystem(TC.new_time)) {
-            TEST_CHECK(got_time != old_time);
-            TEST_CHECK(CompareTime(got_time, TC.new_time));
-            TEST_CHECK(CompareTime(LastAccessTime(TC.p), old_times.access));
+            assert(got_time != old_time);
+            assert(CompareTime(got_time, TC.new_time));
+            assert(CompareTime(LastAccessTime(TC.p), old_times.access));
         }
     }
 }
 
-TEST_CASE(last_write_time_symlink_test)
+static void last_write_time_symlink_test()
 {
     using Clock = file_time_type::clock;
 
@@ -547,24 +543,24 @@
 
     std::error_code ec = GetTestEC();
     last_write_time(sym, new_time, ec);
-    TEST_CHECK(!ec);
+    assert(!ec);
 
     file_time_type  got_time = last_write_time(sym);
-    TEST_CHECK(!CompareTime(got_time, old_times.write));
+    assert(!CompareTime(got_time, old_times.write));
     if (!WorkaroundStatTruncatesToSeconds) {
-      TEST_CHECK(got_time == new_time);
+      assert(got_time == new_time);
     } else {
-      TEST_CHECK(CompareTime(got_time, new_time));
+      assert(CompareTime(got_time, new_time));
     }
 
-    TEST_CHECK(CompareTime(LastWriteTime(file), new_time));
-    TEST_CHECK(CompareTime(LastAccessTime(sym), old_times.access));
+    assert(CompareTime(LastWriteTime(file), new_time));
+    assert(CompareTime(LastAccessTime(sym), old_times.access));
     Times sym_times = GetSymlinkTimes(sym);
-    TEST_CHECK(CompareTime(sym_times.write, old_sym_times.write));
+    assert(CompareTime(sym_times.write, old_sym_times.write));
 }
 
 
-TEST_CASE(test_write_min_time)
+static void test_write_min_time()
 {
     scoped_test_env env;
     const path p = env.create_file("file", 42);
@@ -576,8 +572,8 @@
     file_time_type tt = last_write_time(p);
 
     if (TimeIsRepresentableByFilesystem(new_time)) {
-        TEST_CHECK(!ec);
-        TEST_CHECK(CompareTime(tt, new_time));
+        assert(!ec);
+        assert(CompareTime(tt, new_time));
 
         last_write_time(p, old_time);
         new_time = file_time_type::min() + SubSec(1);
@@ -587,19 +583,19 @@
         tt = last_write_time(p);
 
         if (TimeIsRepresentableByFilesystem(new_time)) {
-            TEST_CHECK(!ec);
-            TEST_CHECK(CompareTime(tt, new_time));
+            assert(!ec);
+            assert(CompareTime(tt, new_time));
         } else {
-          TEST_CHECK(ErrorIs(ec, std::errc::value_too_large));
-          TEST_CHECK(tt == old_time);
+          assert(ErrorIs(ec, std::errc::value_too_large));
+          assert(tt == old_time);
         }
     } else {
-      TEST_CHECK(ErrorIs(ec, std::errc::value_too_large));
-      TEST_CHECK(tt == old_time);
+      assert(ErrorIs(ec, std::errc::value_too_large));
+      assert(tt == old_time);
     }
 }
 
-TEST_CASE(test_write_max_time) {
+static void test_write_max_time() {
   scoped_test_env env;
   const path p = env.create_file("file", 42);
   const file_time_type old_time = last_write_time(p);
@@ -610,27 +606,27 @@
   file_time_type tt = last_write_time(p);
 
   if (TimeIsRepresentableByFilesystem(new_time)) {
-    TEST_CHECK(!ec);
-    TEST_CHECK(CompareTime(tt, new_time));
+    assert(!ec);
+    assert(CompareTime(tt, new_time));
   } else {
-    TEST_CHECK(ErrorIs(ec, std::errc::value_too_large));
-    TEST_CHECK(tt == old_time);
+    assert(ErrorIs(ec, std::errc::value_too_large));
+    assert(tt == old_time);
   }
 }
 
-TEST_CASE(test_value_on_failure)
+static void test_value_on_failure()
 {
     static_test_env static_env;
     const path p = static_env.DNE;
     std::error_code ec = GetTestEC();
-    TEST_CHECK(last_write_time(p, ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::no_such_file_or_directory));
+    assert(last_write_time(p, ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::no_such_file_or_directory));
 }
 
 // Windows doesn't support setting perms::none to trigger failures
 // reading directories.
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-TEST_CASE(test_exists_fails)
+static void test_exists_fails()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -638,13 +634,26 @@
     permissions(dir, perms::none);
 
     std::error_code ec = GetTestEC();
-    TEST_CHECK(last_write_time(file, ec) == file_time_type::min());
-    TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
+    assert(last_write_time(file, ec) == file_time_type::min());
+    assert(ErrorIs(ec, std::errc::permission_denied));
 
     ExceptionChecker Checker(file, std::errc::permission_denied,
                              "last_write_time");
-    TEST_CHECK_THROW_RESULT(filesystem_error, Checker, last_write_time(file));
+    TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, last_write_time(file));
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    read_last_write_time_static_env_test();
+    get_last_write_time_dynamic_env_test();
+    set_last_write_time_dynamic_env_test();
+    last_write_time_symlink_test();
+    test_write_min_time();
+    test_write_max_time();
+    test_value_on_failure();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+    test_exists_fails();
+#endif
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
index 7cf1c72..dc5ff11 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
@@ -20,16 +20,13 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
 using PR = fs::perms;
 
-TEST_SUITE(filesystem_permissions_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     const perms pr{}; ((void)pr);
@@ -41,7 +38,7 @@
     LIBCPP_ONLY(ASSERT_NOT_NOEXCEPT(fs::permissions(p, pr, opts, ec)));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, fs::perms opts,
                          const std::error_code& ec)
@@ -67,20 +64,20 @@
     { // !exists
         std::error_code ec = GetTestEC();
         fs::permissions(dne, fs::perms{}, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(ec != GetTestEC());
-        TEST_CHECK(checkThrow(dne, fs::perms{}, ec));
+        assert(ec);
+        assert(ec != GetTestEC());
+        assert(checkThrow(dne, fs::perms{}, ec));
     }
     {
         std::error_code ec = GetTestEC();
         fs::permissions(dne_sym, fs::perms{}, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(ec != GetTestEC());
-        TEST_CHECK(checkThrow(dne_sym, fs::perms{}, ec));
+        assert(ec);
+        assert(ec != GetTestEC());
+        assert(checkThrow(dne_sym, fs::perms{}, ec));
     }
 }
 
-TEST_CASE(basic_permissions_test)
+static void basic_permissions_test()
 {
     scoped_test_env env;
     const path file = env.create_file("file1", 42);
@@ -120,20 +117,20 @@
         {dir,  perms::group_all, perms::owner_all | perms::group_all, AP | NF}
     };
     for (auto const& TC : cases) {
-        TEST_CHECK(status(TC.p).permissions() != TC.expected);
+        assert(status(TC.p).permissions() != TC.expected);
         {
           std::error_code ec = GetTestEC();
           permissions(TC.p, TC.set_perms, TC.opts, ec);
-          TEST_CHECK(!ec);
+          assert(!ec);
           auto pp = status(TC.p).permissions();
-          TEST_CHECK(pp == NormalizeExpectedPerms(TC.expected));
+          assert(pp == NormalizeExpectedPerms(TC.expected));
         }
         if (TC.opts == perm_options::replace) {
           std::error_code ec = GetTestEC();
           permissions(TC.p, TC.set_perms, ec);
-          TEST_CHECK(!ec);
+          assert(!ec);
           auto pp = status(TC.p).permissions();
-          TEST_CHECK(pp == NormalizeExpectedPerms(TC.expected));
+          assert(pp == NormalizeExpectedPerms(TC.expected));
         }
     }
 }
@@ -142,7 +139,7 @@
 // This test isn't currently meaningful on Windows; the Windows file
 // permissions visible via std::filesystem doesn't show any difference
 // between owner/group/others.
-TEST_CASE(test_no_resolve_symlink_on_symlink)
+static void test_no_resolve_symlink_on_symlink()
 {
     scoped_test_env env;
     const path file = env.create_file("file", 42);
@@ -177,13 +174,21 @@
         std::error_code ec = GetTestEC();
         permissions(sym, TC.set_perms, TC.opts | perm_options::nofollow, ec);
         if (expected_ec)
-            TEST_CHECK(ErrorIs(ec, static_cast<std::errc>(expected_ec.value())));
+            assert(ErrorIs(ec, static_cast<std::errc>(expected_ec.value())));
         else
-            TEST_CHECK(!ec);
-        TEST_CHECK(status(file).permissions() == file_perms);
-        TEST_CHECK(symlink_status(sym).permissions() == expected_link_perms);
+            assert(!ec);
+        assert(status(file).permissions() == file_perms);
+        assert(symlink_status(sym).permissions() == expected_link_perms);
     }
 }
-#endif
+#endif // _WIN32
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_permissions_test();
+#ifndef _WIN32
+    test_no_resolve_symlink_on_symlink();
+#endif
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
index b1341ee..2970d9f 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
@@ -20,7 +20,6 @@
 
 #include "test_macros.h"
 #include "count_new.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 
@@ -33,10 +32,8 @@
   return count;
 }
 
-TEST_SUITE(filesystem_proximate_path_test_suite)
 
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     using fs::path;
     const path p; ((void)p);
@@ -47,12 +44,12 @@
     ASSERT_NOT_NOEXCEPT(proximate(p, p, ec));
 }
 
-TEST_CASE(basic_test) {
+static void basic_test() {
   using fs::path;
   const path cwd = fs::current_path();
   const path parent_cwd = cwd.parent_path();
   const path curdir = cwd.filename();
-  TEST_REQUIRE(!cwd.native().empty());
+  assert(!cwd.native().empty());
   int cwd_depth = count_path_elems(cwd);
   path dot_dot_to_root;
   for (int i=0; i < cwd_depth; ++i)
@@ -141,7 +138,7 @@
     fs::path expect = TC.expect;
     expect.make_preferred();
     if (ec) {
-      TEST_CHECK(!ec);
+      assert(!ec);
       std::fprintf(stderr, "TEST CASE #%d FAILED:\n"
                   "  Input: '%s'\n"
                   "  Base: '%s'\n"
@@ -149,7 +146,7 @@
         ID, TC.input.string().c_str(), TC.base.string().c_str(),
         expect.string().c_str());
     } else if (!PathEq(output, expect)) {
-      TEST_CHECK(PathEq(output, expect));
+      assert(PathEq(output, expect));
 
       const path canon_input = fs::weakly_canonical(TC.input);
       const path canon_base = fs::weakly_canonical(TC.base);
@@ -170,4 +167,9 @@
   }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  signature_test();
+  basic_test();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
index ae94253..fa0bf95 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
@@ -16,14 +16,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_read_symlink_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -35,7 +32,7 @@
     ASSERT_NOT_NOEXCEPT(fs::read_symlink(p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, const std::error_code& ec)
     {
@@ -63,14 +60,14 @@
     for (path const& p : cases) {
         std::error_code ec;
         const path ret = fs::read_symlink(p, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(ret == path{});
-        TEST_CHECK(checkThrow(p, ec));
+        assert(ec);
+        assert(ret == path{});
+        assert(checkThrow(p, ec));
     }
 
 }
 
-TEST_CASE(basic_symlink_test)
+static void basic_symlink_test()
 {
     scoped_test_env env;
     const path dne = env.make_env_path("dne");
@@ -91,9 +88,15 @@
     for (auto& TC : testCases) {
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         const path ret = read_symlink(TC.symlink, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(ret == TC.expected);
+        assert(!ec);
+        assert(ret == TC.expected);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_symlink_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
index 0c05605..820162f 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
@@ -22,76 +22,73 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 #include "count_new.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 
-TEST_SUITE(filesystem_proximate_path_test_suite)
-
-TEST_CASE(test_signature_0) {
+static void test_signature_0() {
   fs::path p("");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(fs::current_path()));
+  assert(output == fs::path::string_type(fs::current_path()));
 }
 
-TEST_CASE(test_signature_1) {
+static void test_signature_1() {
   fs::path p(".");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(fs::current_path()));
+  assert(output == fs::path::string_type(fs::current_path()));
 }
 
-TEST_CASE(test_signature_2) {
+static void test_signature_2() {
   static_test_env static_env;
   fs::path p(static_env.File);
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.File));
+  assert(output == fs::path::string_type(static_env.File));
 }
 
-TEST_CASE(test_signature_3) {
+static void test_signature_3() {
   static_test_env static_env;
   fs::path p(static_env.Dir);
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir));
+  assert(output == fs::path::string_type(static_env.Dir));
 }
 
-TEST_CASE(test_signature_4) {
+static void test_signature_4() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir);
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir));
+  assert(output == fs::path::string_type(static_env.Dir));
 }
 
-TEST_CASE(test_signature_5) {
+static void test_signature_5() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir / "dir2/.");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir / "dir2"));
+  assert(output == fs::path::string_type(static_env.Dir / "dir2"));
 }
 
-TEST_CASE(test_signature_6) {
+static void test_signature_6() {
   static_test_env static_env;
   // FIXME? If the trailing separator occurs in a part of the path that exists,
   // it is omitted. Otherwise it is added to the end of the result.
   fs::path p(static_env.SymlinkToDir / "dir2/./");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir / "dir2"));
+  assert(output == fs::path::string_type(static_env.Dir / "dir2"));
 }
 
-TEST_CASE(test_signature_7) {
+static void test_signature_7() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir / "dir2/DNE/./");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir / "dir2/DNE/"));
+  assert(output == fs::path::string_type(static_env.Dir / "dir2/DNE/"));
 }
 
-TEST_CASE(test_signature_8) {
+static void test_signature_8() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir / "dir2");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir2));
+  assert(output == fs::path::string_type(static_env.Dir2));
 }
 
-TEST_CASE(test_signature_9) {
+static void test_signature_9() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir / "dir2/../dir2/DNE/..");
   const fs::path output = fs::weakly_canonical(p);
@@ -102,38 +99,55 @@
   // to exist, on posix it's considered to not exist. Therefore, the
   // result here differs in the trailing slash.
 #ifdef _WIN32
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir2));
+  assert(output == fs::path::string_type(static_env.Dir2));
 #else
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir2 / ""));
+  assert(output == fs::path::string_type(static_env.Dir2 / ""));
 #endif
 }
 
-TEST_CASE(test_signature_10) {
+static void test_signature_10() {
   static_test_env static_env;
   fs::path p(static_env.SymlinkToDir / "dir2/dir3/../DNE/DNE2");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir2 / "DNE/DNE2"));
+  assert(output == fs::path::string_type(static_env.Dir2 / "DNE/DNE2"));
 }
 
-TEST_CASE(test_signature_11) {
+static void test_signature_11() {
   static_test_env static_env;
   fs::path p(static_env.Dir / "../dir1");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir));
+  assert(output == fs::path::string_type(static_env.Dir));
 }
 
-TEST_CASE(test_signature_12) {
+static void test_signature_12() {
   static_test_env static_env;
   fs::path p(static_env.Dir / "./.");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir));
+  assert(output == fs::path::string_type(static_env.Dir));
 }
 
-TEST_CASE(test_signature_13) {
+static void test_signature_13() {
   static_test_env static_env;
   fs::path p(static_env.Dir / "DNE/../foo");
   const fs::path output = fs::weakly_canonical(p);
-  TEST_CHECK(output == fs::path::string_type(static_env.Dir / "foo"));
+  assert(output == fs::path::string_type(static_env.Dir / "foo"));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+  test_signature_0();
+  test_signature_1();
+  test_signature_2();
+  test_signature_3();
+  test_signature_4();
+  test_signature_5();
+  test_signature_6();
+  test_signature_7();
+  test_signature_8();
+  test_signature_9();
+  test_signature_10();
+  test_signature_11();
+  test_signature_12();
+  test_signature_13();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
index 950ed73..f82a583 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
@@ -16,14 +16,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_remove_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -34,7 +31,7 @@
     ASSERT_NOEXCEPT(fs::remove(p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, const std::error_code& ec)
     {
@@ -71,9 +68,9 @@
     for (auto& p : testCases) {
         std::error_code ec;
 
-        TEST_CHECK(!fs::remove(p, ec));
-        TEST_CHECK(ec);
-        TEST_CHECK(checkThrow(p, ec));
+        assert(!fs::remove(p, ec));
+        assert(ec);
+        assert(checkThrow(p, ec));
     }
 
     // PR#35780
@@ -85,12 +82,12 @@
     for (auto& p : testCasesNonexistant) {
         std::error_code ec;
 
-        TEST_CHECK(!fs::remove(p, ec));
-        TEST_CHECK(!ec);
+        assert(!fs::remove(p, ec));
+        assert(!ec);
     }
 }
 
-TEST_CASE(basic_remove_test)
+static void basic_remove_test()
 {
     scoped_test_env env;
     const path dne = env.make_env_path("dne");
@@ -105,10 +102,15 @@
     };
     for (auto& p : testCases) {
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
-        TEST_CHECK(remove(p, ec));
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(symlink_status(p)));
+        assert(remove(p, ec));
+        assert(!ec);
+        assert(!exists(symlink_status(p)));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_remove_test();
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
index 7ac9ddc..a6842b2 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
@@ -18,14 +18,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_remove_all_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -36,7 +33,7 @@
     ASSERT_NOT_NOEXCEPT(fs::remove_all(p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     scoped_test_env env;
     // Windows doesn't support setting perms::none to trigger failures
@@ -73,9 +70,9 @@
     for (auto& p : testCases) {
         std::error_code ec;
 
-        TEST_CHECK(fs::remove_all(p, ec) == BadRet);
-        TEST_CHECK(ec);
-        TEST_CHECK(checkThrow(p, ec));
+        assert(fs::remove_all(p, ec) == BadRet);
+        assert(ec);
+        assert(checkThrow(p, ec));
     }
 #endif
 
@@ -87,12 +84,12 @@
     for (auto &p : testCasesNonexistant) {
         std::error_code ec;
 
-        TEST_CHECK(fs::remove_all(p, ec) == 0);
-        TEST_CHECK(!ec);
+        assert(fs::remove_all(p, ec) == 0);
+        assert(!ec);
     }
 }
 
-TEST_CASE(basic_remove_all_test)
+static void basic_remove_all_test()
 {
     scoped_test_env env;
     const path dne = env.make_env_path("dne");
@@ -107,13 +104,13 @@
     };
     for (auto& p : testCases) {
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
-        TEST_CHECK(remove(p, ec));
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(symlink_status(p)));
+        assert(remove(p, ec));
+        assert(!ec);
+        assert(!exists(symlink_status(p)));
     }
 }
 
-TEST_CASE(symlink_to_dir)
+static void symlink_to_dir()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -122,16 +119,16 @@
 
     {
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
-        TEST_CHECK(remove_all(link, ec) == 1);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(symlink_status(link)));
-        TEST_CHECK(exists(dir));
-        TEST_CHECK(exists(file));
+        assert(remove_all(link, ec) == 1);
+        assert(!ec);
+        assert(!exists(symlink_status(link)));
+        assert(exists(dir));
+        assert(exists(file));
     }
 }
 
 
-TEST_CASE(nested_dir)
+static void nested_dir()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -147,12 +144,20 @@
     const std::size_t expected_count = sizeof(all_files) / sizeof(all_files[0]);
 
     std::error_code ec = std::make_error_code(std::errc::address_in_use);
-    TEST_CHECK(remove_all(dir, ec) == expected_count);
-    TEST_CHECK(!ec);
+    assert(remove_all(dir, ec) == expected_count);
+    assert(!ec);
     for (auto const& p : all_files) {
-        TEST_CHECK(!exists(symlink_status(p)));
+        assert(!exists(symlink_status(p)));
     }
-    TEST_CHECK(exists(out_of_dir_file));
+    assert(exists(out_of_dir_file));
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_remove_all_test();
+    symlink_to_dir();
+    nested_dir();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/toctou.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/toctou.pass.cpp
index 8831912..e327e72 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/toctou.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/toctou.pass.cpp
@@ -29,9 +29,9 @@
 
 // This test requires a dylib containing the fix shipped in https://reviews.llvm.org/D118134.
 // We use UNSUPPORTED instead of XFAIL because the test might not fail reliably.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx11.0
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx12.{{0|1|2}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx11.0
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx12.{{0|1|2}}
 
 // Windows doesn't support the necessary APIs to mitigate this issue.
 // UNSUPPORTED: target={{.+}}-windows-{{.+}}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
index c651bf1..b1ac260 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
@@ -16,14 +16,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_rename_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -34,7 +31,7 @@
     ASSERT_NOEXCEPT(fs::rename(p, p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, path const& t, const std::error_code& ec)
     {
@@ -75,14 +72,14 @@
         auto to_before = status(TC.to);
         std::error_code ec;
         rename(TC.from, TC.to, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(from_before.type() == status(TC.from).type());
-        TEST_CHECK(to_before.type() == status(TC.to).type());
-        TEST_CHECK(checkThrow(TC.from, TC.to, ec));
+        assert(ec);
+        assert(from_before.type() == status(TC.from).type());
+        assert(to_before.type() == status(TC.to).type());
+        assert(checkThrow(TC.from, TC.to, ec));
     }
 }
 
-TEST_CASE(basic_rename_test)
+static void basic_rename_test()
 {
     scoped_test_env env;
 
@@ -91,28 +88,28 @@
     { // same file
         std::error_code ec = set_ec;
         rename(file, file, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(is_regular_file(file));
-        TEST_CHECK(file_size(file) == 42);
+        assert(!ec);
+        assert(is_regular_file(file));
+        assert(file_size(file) == 42);
     }
     const path sym = env.create_symlink(file, "sym");
     { // file -> symlink
         std::error_code ec = set_ec;
         rename(file, sym, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(file));
-        TEST_CHECK(is_regular_file(symlink_status(sym)));
-        TEST_CHECK(file_size(sym) == 42);
+        assert(!ec);
+        assert(!exists(file));
+        assert(is_regular_file(symlink_status(sym)));
+        assert(file_size(sym) == 42);
     }
     const path file2 = env.create_file("file2", 42);
     const path file3 = env.create_file("file3", 100);
     { // file -> file
         std::error_code ec = set_ec;
         rename(file2, file3, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(file2));
-        TEST_CHECK(is_regular_file(file3));
-        TEST_CHECK(file_size(file3) == 42);
+        assert(!ec);
+        assert(!exists(file2));
+        assert(is_regular_file(file3));
+        assert(file_size(file3) == 42);
     }
     const path dne = env.make_env_path("dne");
     const path bad_sym = env.create_symlink(dne, "bad_sym");
@@ -120,14 +117,14 @@
     { // bad-symlink
         std::error_code ec = set_ec;
         rename(bad_sym, bad_sym_dest, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(symlink_status(bad_sym)));
-        TEST_CHECK(is_symlink(bad_sym_dest));
-        TEST_CHECK(read_symlink(bad_sym_dest) == dne);
+        assert(!ec);
+        assert(!exists(symlink_status(bad_sym)));
+        assert(is_symlink(bad_sym_dest));
+        assert(read_symlink(bad_sym_dest) == dne);
     }
 }
 
-TEST_CASE(basic_rename_dir_test)
+static void basic_rename_dir_test()
 {
     static_test_env env;
     const std::error_code set_ec = std::make_error_code(std::errc::address_in_use);
@@ -135,10 +132,10 @@
     { // dir -> dir (with contents)
         std::error_code ec = set_ec;
         rename(env.Dir, new_dir, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(env.Dir));
-        TEST_CHECK(is_directory(new_dir));
-        TEST_CHECK(exists(new_dir / "file1"));
+        assert(!ec);
+        assert(!exists(env.Dir));
+        assert(is_directory(new_dir));
+        assert(exists(new_dir / "file1"));
     }
 #ifdef _WIN32
     // On Windows, renaming a directory over a file isn't an error (this
@@ -146,12 +143,19 @@
     { // dir -> file
         std::error_code ec = set_ec;
         rename(new_dir, env.NonEmptyFile, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(!exists(new_dir));
-        TEST_CHECK(is_directory(env.NonEmptyFile));
-        TEST_CHECK(exists(env.NonEmptyFile / "file1"));
+        assert(!ec);
+        assert(!exists(new_dir));
+        assert(is_directory(env.NonEmptyFile));
+        assert(exists(env.NonEmptyFile / "file1"));
     }
 #endif
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_rename_test();
+    basic_rename_dir_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
index 5045617..0b03bb8 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
@@ -16,14 +16,11 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_resize_file_test_suite)
-
-TEST_CASE(test_signatures)
+static void test_signatures()
 {
     const path p; ((void)p);
     std::uintmax_t i; ((void)i);
@@ -36,7 +33,7 @@
     ASSERT_NOEXCEPT(fs::resize_file(p, i, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     auto checkThrow = [](path const& f, std::uintmax_t s, const std::error_code& ec)
     {
@@ -64,12 +61,12 @@
     for (auto& p : cases) {
         std::error_code ec;
         resize_file(p, 42, ec);
-        TEST_REQUIRE(ec);
-        TEST_CHECK(checkThrow(p, 42, ec));
+        assert(ec);
+        assert(checkThrow(p, 42, ec));
     }
 }
 
-TEST_CASE(basic_resize_file_test)
+static void basic_resize_file_test()
 {
     scoped_test_env env;
     const path file1 = env.create_file("file1", 42);
@@ -78,31 +75,36 @@
         const std::uintmax_t new_s = 100;
         std::error_code ec = set_ec;
         resize_file(file1, new_s, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(file_size(file1) == new_s);
+        assert(!ec);
+        assert(file_size(file1) == new_s);
     }
     { // shrink file
         const std::uintmax_t new_s = 1;
         std::error_code ec = set_ec;
         resize_file(file1, new_s, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(file_size(file1) == new_s);
+        assert(!ec);
+        assert(file_size(file1) == new_s);
     }
     { // shrink file to zero
         const std::uintmax_t new_s = 0;
         std::error_code ec = set_ec;
         resize_file(file1, new_s, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(file_size(file1) == new_s);
+        assert(!ec);
+        assert(file_size(file1) == new_s);
     }
     const path sym = env.create_symlink(file1, "sym");
     { // grow file via symlink
         const std::uintmax_t new_s = 1024;
         std::error_code ec = set_ec;
         resize_file(sym, new_s, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(file_size(file1) == new_s);
+        assert(!ec);
+        assert(file_size(file1) == new_s);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    test_signatures();
+    test_error_reporting();
+    basic_resize_file_test();
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
index c031796..7659cde 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
@@ -16,7 +16,6 @@
 #include "filesystem_include.h"
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
@@ -29,9 +28,7 @@
     }
 }
 
-TEST_SUITE(filesystem_space_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -41,7 +38,7 @@
     ASSERT_NOEXCEPT(space(p, ec));
 }
 
-TEST_CASE(test_error_reporting)
+static void test_error_reporting()
 {
     static_test_env static_env;
     auto checkThrow = [](path const& f, const std::error_code& ec)
@@ -69,15 +66,15 @@
         const auto expect = static_cast<std::uintmax_t>(-1);
         std::error_code ec;
         space_info info = space(p, ec);
-        TEST_CHECK(ec);
-        TEST_CHECK(info.capacity == expect);
-        TEST_CHECK(info.free == expect);
-        TEST_CHECK(info.available == expect);
-        TEST_CHECK(checkThrow(p, ec));
+        assert(ec);
+        assert(info.capacity == expect);
+        assert(info.free == expect);
+        assert(info.available == expect);
+        assert(checkThrow(p, ec));
     }
 }
 
-TEST_CASE(basic_space_test)
+static void basic_space_test()
 {
     static_test_env static_env;
 
@@ -88,7 +85,7 @@
     std::uintmax_t expect_capacity;
     std::uintmax_t expect_free;
     std::uintmax_t expect_avail;
-    TEST_REQUIRE(utils::space(static_env.Dir.string(), expect_capacity,
+    assert(utils::space(static_env.Dir.string(), expect_capacity,
                               expect_free, expect_avail));
 
     // Other processes running on the operating system may have changed
@@ -105,14 +102,20 @@
     for (auto& p : cases) {
         std::error_code ec = GetTestEC();
         space_info info = space(p, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(info.capacity != bad_value);
-        TEST_CHECK(expect_capacity == info.capacity);
-        TEST_CHECK(info.free != bad_value);
-        TEST_CHECK(EqualDelta(expect_free, info.free, delta));
-        TEST_CHECK(info.available != bad_value);
-        TEST_CHECK(EqualDelta(expect_avail, info.available, delta));
+        assert(!ec);
+        assert(info.capacity != bad_value);
+        assert(expect_capacity == info.capacity);
+        assert(info.free != bad_value);
+        assert(EqualDelta(expect_free, info.free, delta));
+        assert(info.available != bad_value);
+        assert(EqualDelta(expect_avail, info.available, delta));
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    test_error_reporting();
+    basic_space_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
index 3fa9f58..17abaf7 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
@@ -15,15 +15,13 @@
 
 #include "filesystem_include.h"
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_status_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -31,7 +29,7 @@
     ASSERT_NOEXCEPT(status(p, ec));
 }
 
-TEST_CASE(test_status_not_found)
+static void test_status_not_found()
 {
     static_test_env static_env;
     const std::errc expect_errc = std::errc::no_such_file_or_directory;
@@ -43,14 +41,14 @@
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         // test non-throwing overload.
         file_status st = status(p, ec);
-        TEST_CHECK(ErrorIs(ec, expect_errc));
-        TEST_CHECK(st.type() == file_type::not_found);
-        TEST_CHECK(st.permissions() == perms::unknown);
+        assert(ErrorIs(ec, expect_errc));
+        assert(st.type() == file_type::not_found);
+        assert(st.permissions() == perms::unknown);
         // test throwing overload. It should not throw even though it reports
         // that the file was not found.
-        TEST_CHECK_NO_THROW(st = status(p));
-        TEST_CHECK(st.type() == file_type::not_found);
-        TEST_CHECK(st.permissions() == perms::unknown);
+        TEST_DOES_NOT_THROW(st = status(p));
+        assert(st.type() == file_type::not_found);
+        assert(st.permissions() == perms::unknown);
     }
 }
 
@@ -60,7 +58,7 @@
 // for. Finally, status() for a too long file name doesn't return errors
 // on windows.
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-TEST_CASE(test_status_cannot_resolve)
+static void test_status_cannot_resolve()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -85,26 +83,26 @@
         { // test non-throwing case
             std::error_code ec = std::make_error_code(set_errc);
             file_status st = status(TC.p, ec);
-            TEST_CHECK(ErrorIs(ec, TC.expect_errc));
-            TEST_CHECK(st.type() == file_type::none);
-            TEST_CHECK(st.permissions() == perms::unknown);
+            assert(ErrorIs(ec, TC.expect_errc));
+            assert(st.type() == file_type::none);
+            assert(st.permissions() == perms::unknown);
         }
 #ifndef TEST_HAS_NO_EXCEPTIONS
         { // test throwing case
             try {
                 status(TC.p);
             } catch (filesystem_error const& err) {
-                TEST_CHECK(err.path1() == TC.p);
-                TEST_CHECK(err.path2() == "");
-                TEST_CHECK(ErrorIs(err.code(), TC.expect_errc));
+                assert(err.path1() == TC.p);
+                assert(err.path2() == "");
+                assert(ErrorIs(err.code(), TC.expect_errc));
             }
         }
 #endif
     }
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
-TEST_CASE(status_file_types_test)
+static void status_file_types_test()
 {
     static_test_env static_env;
     scoped_test_env env;
@@ -131,17 +129,17 @@
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = status(TC.p, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(st.type() == TC.expect_type);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        assert(!ec);
+        assert(st.type() == TC.expect_type);
+        assert(st.permissions() != perms::unknown);
         // test throwing case
-        TEST_REQUIRE_NO_THROW(st = status(TC.p));
-        TEST_CHECK(st.type() == TC.expect_type);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        TEST_DOES_NOT_THROW(st = status(TC.p));
+        assert(st.type() == TC.expect_type);
+        assert(st.permissions() != perms::unknown);
     }
 }
 
-TEST_CASE(test_block_file)
+static void test_block_file()
 {
     const path possible_paths[] = {
         "/dev/drive0", // Apple
@@ -157,18 +155,29 @@
         }
     }
     if (p == path{}) {
-        TEST_UNSUPPORTED();
+        // No possible path found.
+        return;
     }
     // test non-throwing case
     std::error_code ec = std::make_error_code(std::errc::address_in_use);
     file_status st = status(p, ec);
-    TEST_CHECK(!ec);
-    TEST_CHECK(st.type() == file_type::block);
-    TEST_CHECK(st.permissions() != perms::unknown);
+    assert(!ec);
+    assert(st.type() == file_type::block);
+    assert(st.permissions() != perms::unknown);
     // test throwing case
-    TEST_REQUIRE_NO_THROW(st = status(p));
-    TEST_CHECK(st.type() == file_type::block);
-    TEST_CHECK(st.permissions() != perms::unknown);
+    TEST_DOES_NOT_THROW(st = status(p));
+    assert(st.type() == file_type::block);
+    assert(st.permissions() != perms::unknown);
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    test_status_not_found();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+    test_status_cannot_resolve();
+#endif
+    status_file_types_test();
+    test_block_file();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
index e3763bb..1394c08 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
@@ -17,21 +17,18 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(status_known_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     file_status s; ((void)s);
     ASSERT_SAME_TYPE(decltype(status_known(s)), bool);
     ASSERT_NOEXCEPT(status_known(s));
 }
 
-TEST_CASE(status_known_test)
+static void status_known_test()
 {
     struct TestCase {
         file_type type;
@@ -51,8 +48,13 @@
     };
     for (auto& TC : testCases) {
         file_status s(TC.type);
-        TEST_CHECK(status_known(s) == TC.expect);
+        assert(status_known(s) == TC.expect);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    status_known_test();
+
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
index a1d8ba6..3ab50c3 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
@@ -15,15 +15,13 @@
 
 #include "filesystem_include.h"
 
+#include "assert_macros.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
 
-TEST_SUITE(filesystem_symlink_status_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     const path p; ((void)p);
     std::error_code ec; ((void)ec);
@@ -31,7 +29,7 @@
     ASSERT_NOEXCEPT(symlink_status(p, ec));
 }
 
-TEST_CASE(test_symlink_status_not_found)
+static void test_symlink_status_not_found()
 {
     static_test_env static_env;
     const std::errc expect_errc = std::errc::no_such_file_or_directory;
@@ -42,14 +40,14 @@
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         // test non-throwing overload.
         file_status st = symlink_status(p, ec);
-        TEST_CHECK(ErrorIs(ec, expect_errc));
-        TEST_CHECK(st.type() == file_type::not_found);
-        TEST_CHECK(st.permissions() == perms::unknown);
+        assert(ErrorIs(ec, expect_errc));
+        assert(st.type() == file_type::not_found);
+        assert(st.permissions() == perms::unknown);
         // test throwing overload. It should not throw even though it reports
         // that the file was not found.
-        TEST_CHECK_NO_THROW(st = status(p));
-        TEST_CHECK(st.type() == file_type::not_found);
-        TEST_CHECK(st.permissions() == perms::unknown);
+        TEST_DOES_NOT_THROW(st = status(p));
+        assert(st.type() == file_type::not_found);
+        assert(st.permissions() == perms::unknown);
     }
 }
 
@@ -59,7 +57,7 @@
 // for. Finally, status() for a too long file name doesn't return errors
 // on windows.
 #ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
-TEST_CASE(test_symlink_status_cannot_resolve)
+static void test_symlink_status_cannot_resolve()
 {
     scoped_test_env env;
     const path dir = env.create_dir("dir");
@@ -79,18 +77,18 @@
         { // test non-throwing case
             std::error_code ec = std::make_error_code(set_errc);
             file_status st = symlink_status(p, ec);
-            TEST_CHECK(ErrorIs(ec, expect_errc));
-            TEST_CHECK(st.type() == file_type::none);
-            TEST_CHECK(st.permissions() == perms::unknown);
+            assert(ErrorIs(ec, expect_errc));
+            assert(st.type() == file_type::none);
+            assert(st.permissions() == perms::unknown);
         }
 #ifndef TEST_HAS_NO_EXCEPTIONS
         { // test throwing case
             try {
                 (void)symlink_status(p);
             } catch (filesystem_error const& err) {
-                TEST_CHECK(err.path1() == p);
-                TEST_CHECK(err.path2() == "");
-                TEST_CHECK(ErrorIs(err.code(), expect_errc));
+                assert(err.path1() == p);
+                assert(err.path2() == "");
+                assert(ErrorIs(err.code(), expect_errc));
             }
         }
 #endif
@@ -100,19 +98,19 @@
     {
         std::error_code ec = std::make_error_code(set_errc);
         file_status st = symlink_status(sym_points_in_dir, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(st.type() == file_type::symlink);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        assert(!ec);
+        assert(st.type() == file_type::symlink);
+        assert(st.permissions() != perms::unknown);
         // test non-throwing version
-        TEST_REQUIRE_NO_THROW(st = symlink_status(sym_points_in_dir));
-        TEST_CHECK(st.type() == file_type::symlink);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        TEST_DOES_NOT_THROW(st = symlink_status(sym_points_in_dir));
+        assert(st.type() == file_type::symlink);
+        assert(st.permissions() != perms::unknown);
     }
 }
-#endif
+#endif // TEST_WIN_NO_FILESYSTEM_PERMS_NONE
 
 
-TEST_CASE(symlink_status_file_types_test)
+static void symlink_status_file_types_test()
 {
     static_test_env static_env;
     scoped_test_env env;
@@ -140,17 +138,17 @@
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = symlink_status(TC.p, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(st.type() == TC.expect_type);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        assert(!ec);
+        assert(st.type() == TC.expect_type);
+        assert(st.permissions() != perms::unknown);
         // test throwing case
-        TEST_REQUIRE_NO_THROW(st = symlink_status(TC.p));
-        TEST_CHECK(st.type() == TC.expect_type);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        TEST_DOES_NOT_THROW(st = symlink_status(TC.p));
+        assert(st.type() == TC.expect_type);
+        assert(st.permissions() != perms::unknown);
     }
 }
 
-TEST_CASE(test_block_file)
+static void test_block_file()
 {
     const path possible_paths[] = {
         "/dev/drive0", // Apple
@@ -167,20 +165,21 @@
         }
     }
     if (p == path{}) {
-        TEST_UNSUPPORTED();
+        // No possible path found.
+        return;
     }
     scoped_test_env env;
     { // test block file
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = symlink_status(p, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(st.type() == file_type::block);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        assert(!ec);
+        assert(st.type() == file_type::block);
+        assert(st.permissions() != perms::unknown);
         // test throwing case
-        TEST_REQUIRE_NO_THROW(st = symlink_status(p));
-        TEST_CHECK(st.type() == file_type::block);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        TEST_DOES_NOT_THROW(st = symlink_status(p));
+        assert(st.type() == file_type::block);
+        assert(st.permissions() != perms::unknown);
     }
     const path sym = env.make_env_path("sym");
     create_symlink(p, sym);
@@ -188,14 +187,23 @@
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = symlink_status(sym, ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(st.type() == file_type::symlink);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        assert(!ec);
+        assert(st.type() == file_type::symlink);
+        assert(st.permissions() != perms::unknown);
         // test throwing case
-        TEST_REQUIRE_NO_THROW(st = symlink_status(sym));
-        TEST_CHECK(st.type() == file_type::symlink);
-        TEST_CHECK(st.permissions() != perms::unknown);
+        TEST_DOES_NOT_THROW(st = symlink_status(sym));
+        assert(st.type() == file_type::symlink);
+        assert(st.permissions() != perms::unknown);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    test_symlink_status_not_found();
+#ifndef TEST_WIN_NO_FILESYSTEM_PERMS_NONE
+    test_symlink_status_cannot_resolve();
+#endif
+    symlink_status_file_types_test();
+    test_block_file();
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
index 0b5018d..4bc4099 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
@@ -20,7 +20,6 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "filesystem_test_helper.h"
 
 using namespace fs;
@@ -33,16 +32,14 @@
     assert(utils::unsetenv(var.c_str()) == 0);
 }
 
-TEST_SUITE(filesystem_temp_directory_path_test_suite)
-
-TEST_CASE(signature_test)
+static void signature_test()
 {
     std::error_code ec; ((void)ec);
     ASSERT_NOT_NOEXCEPT(temp_directory_path());
     ASSERT_NOT_NOEXCEPT(temp_directory_path(ec));
 }
 
-TEST_CASE(basic_tests)
+static void basic_tests()
 {
     scoped_test_env env;
     const path dne = env.make_env_path("dne");
@@ -87,45 +84,45 @@
     for (auto& TC : cases) {
         std::error_code ec = GetTestEC();
         path ret = temp_directory_path(ec);
-        TEST_CHECK(!ec);
-        TEST_CHECK(ret == TC.p);
-        TEST_CHECK(is_directory(ret));
+        assert(!ec);
+        assert(ret == TC.p);
+        assert(is_directory(ret));
 
         // Set the env variable to a path that does not exist and check
         // that it fails.
         PutEnv(TC.name, dne);
         ec = GetTestEC();
         ret = temp_directory_path(ec);
-        LIBCPP_ONLY(TEST_CHECK(ErrorIs(ec, expect_errc)));
-        TEST_CHECK(ec != GetTestEC());
-        TEST_CHECK(ec);
-        TEST_CHECK(ret == "");
+        LIBCPP_ONLY(assert(ErrorIs(ec, expect_errc)));
+        assert(ec != GetTestEC());
+        assert(ec);
+        assert(ret == "");
 
         // Set the env variable to point to a file and check that it fails.
         PutEnv(TC.name, file);
         ec = GetTestEC();
         ret = temp_directory_path(ec);
-        LIBCPP_ONLY(TEST_CHECK(ErrorIs(ec, expect_errc)));
-        TEST_CHECK(ec != GetTestEC());
-        TEST_CHECK(ec);
-        TEST_CHECK(ret == "");
+        LIBCPP_ONLY(assert(ErrorIs(ec, expect_errc)));
+        assert(ec != GetTestEC());
+        assert(ec);
+        assert(ret == "");
 
         if (!inaccessible_dir.empty()) {
             // Set the env variable to point to a dir we can't access
             PutEnv(TC.name, inaccessible_dir);
             ec = GetTestEC();
             ret = temp_directory_path(ec);
-            TEST_CHECK(ErrorIs(ec, std::errc::permission_denied));
-            TEST_CHECK(ret == "");
+            assert(ErrorIs(ec, std::errc::permission_denied));
+            assert(ret == "");
         }
 
         // Set the env variable to point to a non-existent dir
         PutEnv(TC.name, TC.p / "does_not_exist");
         ec = GetTestEC();
         ret = temp_directory_path(ec);
-        TEST_CHECK(ec != GetTestEC());
-        TEST_CHECK(ec);
-        TEST_CHECK(ret == "");
+        assert(ec != GetTestEC());
+        assert(ec);
+        assert(ret == "");
 
         // Finally erase this env variable
         UnsetEnv(TC.name);
@@ -135,12 +132,12 @@
     {
         std::error_code ec = GetTestEC();
         path ret = temp_directory_path(ec);
-        TEST_CHECK(!ec);
+        assert(!ec);
 #ifndef _WIN32
         // On Windows, the function falls back to the Windows folder.
-        TEST_CHECK(ret == "/tmp");
+        assert(ret == "/tmp");
 #endif
-        TEST_CHECK(is_directory(ret));
+        assert(is_directory(ret));
         fallback = ret;
     }
     for (auto& TC : ignored_cases) {
@@ -148,14 +145,18 @@
         PutEnv(TC.name, TC.p);
         std::error_code ec = GetTestEC();
         path ret = temp_directory_path(ec);
-        TEST_CHECK(!ec);
+        assert(!ec);
 
         // Check that we return the same as above when no vars were defined.
-        TEST_CHECK(ret == fallback);
+        assert(ret == fallback);
 
         // Finally erase this env variable
         UnsetEnv(TC.name);
     }
 }
 
-TEST_SUITE_END()
+int main(int, char**) {
+    signature_test();
+    basic_tests();
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/lit.local.cfg b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/lit.local.cfg
index b22876f..c219596 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/filesystems/lit.local.cfg
+++ b/third_party/llvm-project/libcxx/test/std/input.output/filesystems/lit.local.cfg
@@ -1,10 +1,5 @@
-# Filesystem is supported on Apple platforms starting with macosx10.15.
-# Automatically disable the <filesystem> tests when we're running the test
-# suite against an older macOS.
-too_old = {'10.9', '10.10', '10.11', '10.12', '10.13', '10.14'}
-if 'use_system_cxx_lib' in config.available_features:
-  if any('target=x86_64-apple-macosx{}'.format(v) in config.available_features for v in too_old):
-    config.unsupported = True
+if 'availability-filesystem-missing' in config.available_features:
+  config.unsupported = True
 
 if 'no-filesystem' in config.available_features:
     config.unsupported = True
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
index fa14790..c7d7a4e 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
index 85d13b3..7bb7930 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
index 44ba89a..cf4070a 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
index 5ab4515..6bfd64a 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
index 4af8578..8eca4d4 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
index e7d7074..f290efe 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
index e13237c..04fa1ea 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
index f3b5bba..ee388e9 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
index 4f9c1a1..965e029 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
index 64bafa1..f15a352 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
index 764ca34..7c26e47 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
index 25dface..d9af921 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
index e01cd3d..de5a989 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
index ff96d12..35cb70e 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
index 18a29da..13ac402 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
index 7dd808e..fe15b36 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
index 76e860f..8ae08ba 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
@@ -8,7 +8,7 @@
 
 // In macosx10.9 to macosx10.14, streams are provided in the dylib AND they
 // have a bug in how they handle null-termination in case of errors (see D40677).
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
index 38b5163..f310172 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
@@ -8,7 +8,7 @@
 
 // In macosx10.9 to macosx10.14, streams are provided in the dylib AND they
 // have a bug in how they handle null-termination in case of errors (see D40677).
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
index a6c6687..331e38c 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
index 27d9ed8..50ec7ea 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
index 6e0d8b0..8d131da 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
@@ -8,7 +8,7 @@
 
 // In macosx10.9 to macosx10.14, streams are provided in the dylib AND they
 // have a bug in how they handle null-termination in case of errors (see D40677).
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
index d07e74c..b85478d 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
@@ -8,7 +8,7 @@
 
 // In macosx10.9 to macosx10.14, streams are provided in the dylib AND they
 // have a bug in how they handle null-termination in case of errors (see D40677).
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
index 0f1edcd..e313ddc 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
index 2ca7016..29ccb2c 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
index 5f8c455..a00842d 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
index a5aaf21..8b43c31 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // <istream>
 
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
index 1261512..a5b19c4 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
@@ -25,7 +25,7 @@
 
 // This test exposes a regression that was not fixed yet in the libc++
 // shipped with macOS 10.12, 10.13 and 10.14. See D32670 for details.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{12|13|14}}
 
 #include <cassert>
 #include <cstdint>
@@ -67,9 +67,9 @@
     test<unsigned int>(d, "4294967295");
     test<unsigned int>(x, "0xffffffff");
 
-    const bool long_is_32 = std::integral_constant<bool, sizeof(long) == sizeof(int32_t)>::value; // avoid compiler warnings
-    const bool long_is_64 = std::integral_constant<bool, sizeof(long) == sizeof(int64_t)>::value; // avoid compiler warnings
-    const bool long_long_is_64 = std::integral_constant<bool, sizeof(long long) == sizeof(int64_t)>::value; // avoid compiler warnings
+    const bool long_is_32 = std::integral_constant<bool, sizeof(long) == sizeof(std::int32_t)>::value; // avoid compiler warnings
+    const bool long_is_64 = std::integral_constant<bool, sizeof(long) == sizeof(std::int64_t)>::value; // avoid compiler warnings
+    const bool long_long_is_64 = std::integral_constant<bool, sizeof(long long) == sizeof(std::int64_t)>::value; // avoid compiler warnings
 
     if (long_is_32) {
         test<long>(o, "020000000000");
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
index 8e3b77c..207fc42 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.12
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.12
 
 // <ostream>
 
@@ -54,7 +54,7 @@
     ss << std::hex << static_cast<T>(-1);
 
     std::string str = ss.str();
-    for (size_t i = 0; i < str.size(); ++i )
+    for (std::size_t i = 0; i < str.size(); ++i )
         str[i] = static_cast<char>(std::toupper(str[i]));
 
     assert(str == expected);
@@ -63,16 +63,16 @@
 int main(int, char**)
 {
 
-    test_octal<uint16_t>(                "177777");
-    test_octal< int16_t>(                "177777");
-    test_octal<uint32_t>(           "37777777777");
-    test_octal< int32_t>(           "37777777777");
-    test_octal<uint64_t>("1777777777777777777777");
-    test_octal< int64_t>("1777777777777777777777");
-    test_octal<uint64_t>("1777777777777777777777");
+    test_octal<std::uint16_t>(                "177777");
+    test_octal< std::int16_t>(                "177777");
+    test_octal<std::uint32_t>(           "37777777777");
+    test_octal< std::int32_t>(           "37777777777");
+    test_octal<std::uint64_t>("1777777777777777777777");
+    test_octal< std::int64_t>("1777777777777777777777");
+    test_octal<std::uint64_t>("1777777777777777777777");
 
-    const bool long_is_64 = std::integral_constant<bool, sizeof(long) == sizeof(int64_t)>::value; // avoid compiler warnings
-    const bool long_long_is_64 = std::integral_constant<bool, sizeof(long long) == sizeof(int64_t)>::value; // avoid compiler warnings
+    const bool long_is_64 = std::integral_constant<bool, sizeof(long) == sizeof(std::int64_t)>::value; // avoid compiler warnings
+    const bool long_long_is_64 = std::integral_constant<bool, sizeof(long long) == sizeof(std::int64_t)>::value; // avoid compiler warnings
 
     if (long_is_64) {
         test_octal< unsigned long>("1777777777777777777777");
@@ -83,12 +83,12 @@
         test_octal<          long long>("1777777777777777777777");
     }
 
-    test_dec<uint16_t>(               "65535");
-    test_dec< int16_t>(                  "-1");
-    test_dec<uint32_t>(          "4294967295");
-    test_dec< int32_t>(                  "-1");
-    test_dec<uint64_t>("18446744073709551615");
-    test_dec< int64_t>(                  "-1");
+    test_dec<std::uint16_t>(               "65535");
+    test_dec< std::int16_t>(                  "-1");
+    test_dec<std::uint32_t>(          "4294967295");
+    test_dec< std::int32_t>(                  "-1");
+    test_dec<std::uint64_t>("18446744073709551615");
+    test_dec< std::int64_t>(                  "-1");
     if (long_is_64) {
         test_dec<unsigned long>("18446744073709551615");
         test_dec<         long>(                  "-1");
@@ -98,12 +98,12 @@
         test_dec<         long long>(                  "-1");
     }
 
-    test_hex<uint16_t>(            "FFFF");
-    test_hex< int16_t>(            "FFFF");
-    test_hex<uint32_t>(        "FFFFFFFF");
-    test_hex< int32_t>(        "FFFFFFFF");
-    test_hex<uint64_t>("FFFFFFFFFFFFFFFF");
-    test_hex< int64_t>("FFFFFFFFFFFFFFFF");
+    test_hex<std::uint16_t>(            "FFFF");
+    test_hex< std::int16_t>(            "FFFF");
+    test_hex<std::uint32_t>(        "FFFFFFFF");
+    test_hex< std::int32_t>(        "FFFFFFFF");
+    test_hex<std::uint64_t>("FFFFFFFFFFFFFFFF");
+    test_hex< std::int64_t>("FFFFFFFFFFFFFFFF");
     if (long_is_64) {
         test_hex<unsigned long>("FFFFFFFFFFFFFFFF");
         test_hex<         long>("FFFFFFFFFFFFFFFF");
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_char.verify.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_char.verify.cpp
index 4d96351..22013cd 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_char.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_char.verify.cpp
@@ -16,9 +16,6 @@
 #include <iomanip>
 #include <sstream>
 #include <string>
-#include <cassert>
-
-#include "test_macros.h"
 
 //  Test that mismatches between strings and wide streams are diagnosed
 
@@ -29,6 +26,6 @@
     ss >> std::quoted(s); // expected-error {{invalid operands to binary expression}}
 }
 
-int main(int, char**) {
+void f() {
     round_trip("Hi Mom");
 }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_traits.verify.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_traits.verify.cpp
index 5a92485..e457adb 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_traits.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostream.format/quoted.manip/quoted_traits.verify.cpp
@@ -15,9 +15,6 @@
 #include <iomanip>
 #include <sstream>
 #include <string>
-#include <cassert>
-
-#include "test_macros.h"
 
 //  Test that mismatches in the traits between the quoted object and the dest string are diagnosed.
 
@@ -33,6 +30,6 @@
     ss >> std::quoted(s); // expected-error {{invalid operands to binary expression}}
 }
 
-int main(int, char**) {
+void f() {
     round_trip("Hi Mom");
 }
diff --git a/third_party/llvm-project/libcxx/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/ios_Init.multiple.pass.cpp b/third_party/llvm-project/libcxx/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/ios_Init.multiple.pass.cpp
index 1a9aaa9..f842f28 100644
--- a/third_party/llvm-project/libcxx/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/ios_Init.multiple.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/ios_Init.multiple.pass.cpp
@@ -16,7 +16,7 @@
 
 // The dylibs shipped on macOS so far do not contain the fix for PR43300, so
 // this test fails.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/data.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/data.pass.cpp
index 72c4b65..1a6af4a 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/data.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/data.pass.cpp
@@ -54,7 +54,7 @@
     assert ( std::data(c)   == c.begin());
 }
 
-template<typename T, size_t Sz>
+template<typename T, std::size_t Sz>
 void test_const_array( const T (&array)[Sz] )
 {
     ASSERT_NOEXCEPT(std::data(array));
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.array.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.array.verify.cpp
index e67d864..c60c752 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.array.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.array.verify.cpp
@@ -13,15 +13,9 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-#include <vector>
 #include <iterator>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     int c[5];
     std::empty(c); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.container.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.container.verify.cpp
index 44b102e..6fbaa05 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.container.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.container.verify.cpp
@@ -16,12 +16,7 @@
 #include <vector>
 #include <iterator>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::vector<int> c;
     std::empty(c); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.initializer_list.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.initializer_list.verify.cpp
index f97534d..416931f 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.initializer_list.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.initializer_list.verify.cpp
@@ -16,12 +16,7 @@
 #include <initializer_list>
 #include <iterator>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::initializer_list<int> c = { 4 };
     std::empty(c); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.pass.cpp
index 1e1c0e4..1a00e88 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/empty.pass.cpp
@@ -53,7 +53,7 @@
     assert ( std::empty(c)   == (c.size() == 0));
 }
 
-template<typename T, size_t Sz>
+template<typename T, std::size_t Sz>
 void test_const_array( const T (&array)[Sz] )
 {
     ASSERT_NOEXCEPT(std::empty(array));
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/size.pass.cpp
index 697119a..975d3e8 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/size.pass.cpp
@@ -54,7 +54,7 @@
     assert ( std::size(c)   == c.size());
 }
 
-template<typename T, size_t Sz>
+template<typename T, std::size_t Sz>
 void test_const_array( const T (&array)[Sz] )
 {
     ASSERT_NOEXCEPT(std::size(array));
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/ssize.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/ssize.pass.cpp
index 9f384c6..e7531ae 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/ssize.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.container/ssize.pass.cpp
@@ -13,14 +13,16 @@
 //     -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>;                    // C++20
 // template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20
 
-#include <iterator>
-#include <cassert>
-#include <vector>
 #include <array>
-#include <list>
+#include <cassert>
+#include <cstdint>
 #include <initializer_list>
-#include <string_view>
+#include <iterator>
 #include <limits>
+#include <list>
+#include <string_view>
+#include <type_traits>
+#include <vector>
 
 #include "test_macros.h"
 
@@ -28,7 +30,7 @@
 TEST_GCC_DIAGNOSTIC_IGNORED("-Wtype-limits")
 
 struct short_container {
-    uint16_t size() const { return 60000; } // not noexcept
+    std::uint16_t size() const { return 60000; } // not noexcept
 };
 
 template<typename C>
@@ -63,7 +65,7 @@
     assert ( std::ssize(c)   == static_cast<decltype(std::ssize(c))>(c.size()));
 }
 
-template<typename T, size_t Sz>
+template<typename T, std::size_t Sz>
 void test_const_array(const T (&array)[Sz])
 {
     ASSERT_NOEXCEPT(std::ssize(array));
@@ -98,7 +100,7 @@
     test_const_container ( sv );
 
     static constexpr int arrA [] { 1, 2, 3 };
-    ASSERT_SAME_TYPE(ptrdiff_t, decltype(std::ssize(arrA)));
+    ASSERT_SAME_TYPE(std::ptrdiff_t, decltype(std::ssize(arrA)));
     static_assert( std::is_signed_v<decltype(std::ssize(arrA))>, "");
     test_const_array ( arrA );
 
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
index 9a0f6be..18fc2fb 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class T>
 // struct iterator_traits;
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.nodiscard.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.nodiscard.verify.cpp
index f531b3a..ed4061f 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.nodiscard.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.nodiscard.verify.cpp
@@ -24,12 +24,10 @@
   friend constexpr auto iter_move(WithADL&) { return 0; }
 };
 
-int main(int, char**) {
+void f() {
   int* noADL = nullptr;
   std::ranges::iter_move(noADL); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
 
   WithADL adl;
   std::ranges::iter_move(adl); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.pass.cpp
index 31ec010..5666382 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/iterator.requirements/iterator.cust/iterator.cust.move/iter_move.pass.cpp
@@ -11,11 +11,11 @@
 // template<class I>
 // unspecified iter_move;
 
-#include <iterator>
-
-#include <array>
 #include <algorithm>
+#include <array>
 #include <cassert>
+#include <iterator>
+#include <type_traits>
 #include <utility>
 
 #include "../unqualified_lookup_wrapper.h"
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_move.pass.cpp
index a9e6d17..e0f63ac 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_move.pass.cpp
@@ -28,7 +28,7 @@
 struct MaybeNoexceptMove {
   int x;
   using value_type = int;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
 
   constexpr friend value_type&& iter_move(MaybeNoexceptMove) noexcept(IsNoexcept) {
     return std::move(global);
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_swap.pass.cpp
index 075930d..aa08153 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/iter_swap.pass.cpp
@@ -26,7 +26,7 @@
 template <bool IsNoexcept>
 struct MaybeNoexceptSwap {
   using value_type = int;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
 
   constexpr friend void iter_swap(MaybeNoexceptSwap, MaybeNoexceptSwap) noexcept(IsNoexcept) {
   }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/ctor.iter.explicit.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/ctor.iter.explicit.verify.cpp
index b141115..5b609f8 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/ctor.iter.explicit.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/ctor.iter.explicit.verify.cpp
@@ -16,8 +16,7 @@
 
 #include <iterator>
 
-int main(int, char**) {
+void f() {
     char const* it = "";
     std::move_iterator<char const*> r = it; // expected-error{{no viable conversion from 'const char *' to 'std::move_iterator<const char *>'}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/deprecated.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/deprecated.verify.cpp
index 8c1684f..e4e22cb 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/deprecated.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/deprecated.verify.cpp
@@ -12,9 +12,6 @@
 
 #include <iterator>
 
-int main(int, char**) {
-  (void)std::move_iterator<int*>().operator->();
-  // expected-warning@-1{{'operator->' is deprecated}}
-
-  return 0;
+void f() {
+  (void)std::move_iterator<int*>().operator->(); // expected-warning {{'operator->' is deprecated}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/iterator_concept_conformance.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/iterator_concept_conformance.compile.pass.cpp
index 844da40..1b21fd7 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/iterator_concept_conformance.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/iterator_concept_conformance.compile.pass.cpp
@@ -56,8 +56,8 @@
 
     static_assert( std::default_initializable<iterator>);
     static_assert( std::copyable<iterator>);
-    static_assert( std::input_iterator<iterator>);
-    static_assert(!std::forward_iterator<iterator>);
+    static_assert( std::forward_iterator<iterator>);
+    static_assert(!std::bidirectional_iterator<iterator>);
     static_assert( std::sentinel_for<iterator, iterator>);
     static_assert(!std::sized_sentinel_for<iterator, iterator>);
     static_assert(!std::indirectly_movable<int*, iterator>);
@@ -73,8 +73,8 @@
 
     static_assert( std::default_initializable<iterator>);
     static_assert( std::copyable<iterator>);
-    static_assert( std::input_iterator<iterator>);
-    static_assert(!std::forward_iterator<iterator>);
+    static_assert( std::bidirectional_iterator<iterator>);
+    static_assert(!std::random_access_iterator<iterator>);
     static_assert( std::sentinel_for<iterator, iterator>);
     static_assert(!std::sized_sentinel_for<iterator, iterator>);
     static_assert(!std::indirectly_movable<int*, iterator>);
@@ -90,8 +90,8 @@
 
     static_assert( std::default_initializable<iterator>);
     static_assert( std::copyable<iterator>);
-    static_assert( std::input_iterator<iterator>);
-    static_assert(!std::forward_iterator<iterator>);
+    static_assert( std::random_access_iterator<iterator>);
+    static_assert(!std::contiguous_iterator<iterator>);
     static_assert( std::sentinel_for<iterator, iterator>);
     static_assert( std::sized_sentinel_for<iterator, iterator>);
     static_assert(!std::indirectly_movable<int*, iterator>);
@@ -107,8 +107,8 @@
 
     static_assert( std::default_initializable<iterator>);
     static_assert( std::copyable<iterator>);
-    static_assert( std::input_iterator<iterator>);
-    static_assert(!std::forward_iterator<iterator>);
+    static_assert( std::random_access_iterator<iterator>);
+    static_assert(!std::contiguous_iterator<iterator>);
     static_assert( std::sentinel_for<iterator, iterator>);
     static_assert( std::sized_sentinel_for<iterator, iterator>);
     static_assert(!std::indirectly_movable<int*, iterator>);
@@ -124,8 +124,8 @@
 
     static_assert( std::default_initializable<iterator>);
     static_assert( std::copyable<iterator>);
-    static_assert( std::input_iterator<iterator>);
-    static_assert(!std::forward_iterator<iterator>);
+    static_assert( std::random_access_iterator<iterator>);
+    static_assert(!std::contiguous_iterator<iterator>);
     static_assert( std::sentinel_for<iterator, iterator>);
     static_assert( std::sized_sentinel_for<iterator, iterator>);
     static_assert(!std::indirectly_movable<int*, iterator>);
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
index 5676564..8b92eb2 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
@@ -16,7 +16,7 @@
 // class move_iterator {
 // public:
 //  using iterator_type     = Iterator;
-//  using iterator_concept  = input_iterator_tag; // From C++20
+//  using iterator_concept  = see below; // From C++20
 //  using iterator_category = see below; // not always present starting from C++20
 //  using value_type        = iter_value_t<Iterator>; // Until C++20, iterator_traits<Iterator>::value_type
 //  using difference_type   = iter_difference_t<Iterator>; // Until C++20, iterator_traits<Iterator>::difference_type;
@@ -99,7 +99,11 @@
 #endif
 
 #if TEST_STD_VER > 17
-  static_assert(std::is_same_v<typename R::iterator_concept, std::input_iterator_tag>);
+  static_assert(
+      std::is_same_v<typename R::iterator_concept,
+                     std::conditional_t<std::is_same_v<typename R::iterator_concept, std::contiguous_iterator_tag>,
+                                        std::random_access_iterator_tag,
+                                        typename R::iterator_concept>>);
 #endif
 }
 
@@ -142,11 +146,11 @@
 
 #if TEST_STD_VER > 17
   test<contiguous_iterator<char*>>();
-  static_assert(std::is_same_v<typename std::move_iterator<forward_iterator<char*>>::iterator_concept, std::input_iterator_tag>);
-  static_assert(std::is_same_v<typename std::move_iterator<bidirectional_iterator<char*>>::iterator_concept, std::input_iterator_tag>);
-  static_assert(std::is_same_v<typename std::move_iterator<random_access_iterator<char*>>::iterator_concept, std::input_iterator_tag>);
-  static_assert(std::is_same_v<typename std::move_iterator<contiguous_iterator<char*>>::iterator_concept, std::input_iterator_tag>);
-  static_assert(std::is_same_v<typename std::move_iterator<char*>::iterator_concept, std::input_iterator_tag>);
+  static_assert(std::is_same_v<typename std::move_iterator<forward_iterator<char*>>::iterator_concept, std::forward_iterator_tag>);
+  static_assert(std::is_same_v<typename std::move_iterator<bidirectional_iterator<char*>>::iterator_concept, std::bidirectional_iterator_tag>);
+  static_assert(std::is_same_v<typename std::move_iterator<random_access_iterator<char*>>::iterator_concept, std::random_access_iterator_tag>);
+  static_assert(std::is_same_v<typename std::move_iterator<contiguous_iterator<char*>>::iterator_concept, std::random_access_iterator_tag>);
+  static_assert(std::is_same_v<typename std::move_iterator<char*>::iterator_concept, std::random_access_iterator_tag>);
 #endif
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cmp/sfinae.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cmp/sfinae.compile.pass.cpp
index 92e0e5c..8ead392 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cmp/sfinae.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cmp/sfinae.compile.pass.cpp
@@ -49,7 +49,7 @@
 struct IterBase {
   using iterator_category = std::bidirectional_iterator_tag;
   using value_type = int;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
   using pointer = int*;
   using reference = int&;
 
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cons/ctor.iter.explicit.verify.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cons/ctor.iter.explicit.verify.cpp
index 940848b..d69799d 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cons/ctor.iter.explicit.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.cons/ctor.iter.explicit.verify.cpp
@@ -16,8 +16,7 @@
 
 #include <iterator>
 
-int main(int, char**) {
+void f() {
     char const* it = "";
     std::reverse_iterator<char const*> r = it; // expected-error{{no viable conversion from 'const char *' to 'std::reverse_iterator<const char *>'}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_move.pass.cpp
index 712425a..5e35f5c 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_move.pass.cpp
@@ -55,7 +55,7 @@
     {
       struct ThrowingCopyNoexceptDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         ThrowingCopyNoexceptDecrement();
         ThrowingCopyNoexceptDecrement(const ThrowingCopyNoexceptDecrement&);
@@ -80,7 +80,7 @@
     {
       struct NoexceptCopyThrowingDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         NoexceptCopyThrowingDecrement();
         NoexceptCopyThrowingDecrement(const NoexceptCopyThrowingDecrement&) noexcept;
@@ -105,7 +105,7 @@
     {
       struct NoexceptCopyAndDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         NoexceptCopyAndDecrement();
         NoexceptCopyAndDecrement(const NoexceptCopyAndDecrement&) noexcept;
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_swap.pass.cpp
index d01ee2a..7b6fb43 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.nonmember/iter_swap.pass.cpp
@@ -61,7 +61,7 @@
     {
       struct ThrowingCopyNoexceptDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         ThrowingCopyNoexceptDecrement();
         ThrowingCopyNoexceptDecrement(const ThrowingCopyNoexceptDecrement&);
@@ -89,7 +89,7 @@
     {
       struct NoexceptCopyThrowingDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         NoexceptCopyThrowingDecrement();
         NoexceptCopyThrowingDecrement(const NoexceptCopyThrowingDecrement&) noexcept;
@@ -117,7 +117,7 @@
     {
       struct NoexceptCopyAndDecrement {
         using value_type = int;
-        using difference_type = ptrdiff_t;
+        using difference_type = std::ptrdiff_t;
 
         NoexceptCopyAndDecrement();
         NoexceptCopyAndDecrement(const NoexceptCopyAndDecrement&) noexcept;
diff --git a/third_party/llvm-project/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
index 7273223..d8377f0 100644
--- a/third_party/llvm-project/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
@@ -14,9 +14,10 @@
 // C++17 says: If is_trivially_default_constructible_v<T> is true, then this
 //    constructor is a constexpr constructor.
 
-#include <iterator>
 #include <cassert>
+#include <iterator>
 #include <string>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
index 6d2687f..8e3c793 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
@@ -50,9 +50,8 @@
   TEST_PASS(v, <=>);
 }
 
-int main(int, char**) {
+void f() {
   test_category(std::strong_ordering::equivalent);
   test_category(std::weak_ordering::equivalent);
   test_category(std::partial_ordering::equivalent);
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
index 6d5b9e9..1e3aed2 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
@@ -30,8 +30,8 @@
 
 template <class C>
 void do_test(int *LHSVal, int *RHSVal) {
-  [[maybe_unused]] const size_t ExpectLHS = std::hash<void*>{}(LHSVal);
-  [[maybe_unused]] const size_t ExpectRHS = std::hash<void*>{}(RHSVal);
+  [[maybe_unused]] const std::size_t ExpectLHS = std::hash<void*>{}(LHSVal);
+  [[maybe_unused]] const std::size_t ExpectRHS = std::hash<void*>{}(RHSVal);
   const C LHS = C::from_address(LHSVal);
   const C RHS = C::from_address(RHSVal);
   const std::hash<C> h;
@@ -40,7 +40,7 @@
   LIBCPP_ASSERT(h(RHS) == ExpectRHS);
   assert((h(LHS) == h(RHS)) == (LHSVal == RHSVal));
   {
-    ASSERT_SAME_TYPE(decltype(h(LHS)), size_t);
+    ASSERT_SAME_TYPE(decltype(h(LHS)), std::size_t);
     ASSERT_NOEXCEPT(std::hash<C>{}(LHS));
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
index 5281484..868abe5 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
@@ -11,9 +11,8 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
index 22f67eb..7aa31a9 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
@@ -11,9 +11,8 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
index 40d4a86..a0845eb 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
@@ -11,9 +11,8 @@
 
 // XFAIL: LIBCXX-AIX-FIXME
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.verify.cpp
index efd84bb..8e97916 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.verify.cpp
@@ -17,7 +17,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new[](4);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.verify.cpp
index 1551a05..530e152 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.verify.cpp
@@ -21,7 +21,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new[](4, std::align_val_t{4});  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.verify.cpp
index ec819627..3310073 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.verify.cpp
@@ -21,7 +21,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new[](4, std::align_val_t{4}, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.verify.cpp
index 066ca1a..fd954d4 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.verify.cpp
@@ -17,7 +17,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new[](4, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.pass.cpp
index 2a5bb21..7fb9293 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.pass.cpp
@@ -12,7 +12,7 @@
 // when sized deallocation is not supported, e.g., prior to C++14.
 
 // UNSUPPORTED: sanitizer-new-delete
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // REQUIRES: -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS: -fsized-deallocation
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.verify.cpp
index b5ec824..b1b2f0f 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.verify.cpp
@@ -14,12 +14,7 @@
 
 #include <new>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     char buffer[100];
     ::operator new[](4, buffer); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.verify.cpp
index 5029864..e98144e 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.verify.cpp
@@ -14,12 +14,7 @@
 
 #include <new>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     char buffer[100];
     ::operator new(4, buffer); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
index d662e08..bd3c737 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
index cd1b3f8..de48167 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
index 13e6c52..285c88f 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
@@ -11,9 +11,8 @@
 
 // XFAIL: LIBCXX-AIX-FIXME
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.verify.cpp
index ed66078..d3ed46e 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.verify.cpp
@@ -14,11 +14,6 @@
 
 #include <new>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     ::operator new(4); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.verify.cpp
index 2a30e15..42a8861 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.verify.cpp
@@ -21,7 +21,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new(4, std::align_val_t{4});  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.verify.cpp
index 047e81d..8dcdbe3 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.verify.cpp
@@ -21,7 +21,6 @@
 
 #include <new>
 
-int main(int, char**) {
+void f() {
     ::operator new(4, std::align_val_t{4}, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.verify.cpp
index 4826cb4..081769b 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.verify.cpp
@@ -14,11 +14,6 @@
 
 #include <new>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     ::operator new(4, std::nothrow); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
index 826b2a3..d990777 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
@@ -12,7 +12,7 @@
 // when sized deallocation is not supported, e.g., prior to C++14.
 
 // UNSUPPORTED: sanitizer-new-delete
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // REQUIRES: -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS: -fsized-deallocation, -O3
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.verify.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.verify.cpp
index 632ca0e..f8e6cb2 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.verify.cpp
@@ -11,17 +11,11 @@
 // template <class T> constexpr T* launder(T* p) noexcept;
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORETD: c++17 && !stdlib=libc++
+// UNSUPPORTED: c++17 && !stdlib=libc++
 
 #include <new>
-#include <cassert>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     int *p = nullptr;
     std::launder(p); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
index 658c0a8..1d8b6b1 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
@@ -9,11 +9,11 @@
 // UNSUPPORTED: no-exceptions
 
 // std::uncaught_exceptions() was introduced in the dylib on Mac OS 10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // However, std::uncaught_exceptions() gives the wrong answer in Mac OS 10.12
 // and 10.13, where it only gives 0 or 1. This was fixed later.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{12|13}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{12|13}}
 
 // test uncaught_exceptions
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/limits/is_specialized.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
index 0c39f9f..f27c73157 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
@@ -44,7 +44,7 @@
 
 int main(int, char**)
 {
-  meta::for_each(meta::arithmetic_types(), Test());
+  types::for_each(types::arithmetic_types(), Test());
 
   static_assert(!std::numeric_limits<std::complex<double> >::is_specialized,
                 "!std::numeric_limits<std::complex<double> >::is_specialized");
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
index 198fe9d..eeafd01 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
@@ -216,7 +216,7 @@
 #   error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++20"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_atomic_wait
 #     error "__cpp_lib_atomic_wait should be defined in c++20"
 #   endif
@@ -225,7 +225,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)' is not met!"
+#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
@@ -311,7 +311,7 @@
 #   error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_atomic_wait
 #     error "__cpp_lib_atomic_wait should be defined in c++2b"
 #   endif
@@ -320,7 +320,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)' is not met!"
+#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/barrier.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/barrier.version.compile.pass.cpp
index 109c955..adf2dee 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/barrier.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/barrier.version.compile.pass.cpp
@@ -44,7 +44,7 @@
 
 #elif TEST_STD_VER == 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_barrier
 #     error "__cpp_lib_barrier should be defined in c++20"
 #   endif
@@ -53,13 +53,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_barrier
-#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)' is not met!"
+#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_barrier
 #     error "__cpp_lib_barrier should be defined in c++2b"
 #   endif
@@ -68,7 +68,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_barrier
-#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)' is not met!"
+#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.compile.pass.cpp
index 4530898..692c7fa 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.compile.pass.cpp
@@ -51,7 +51,7 @@
 #   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++17"
 #   endif
@@ -60,7 +60,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
@@ -79,7 +79,7 @@
 #   endif
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++20"
 #   endif
@@ -88,7 +88,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
@@ -107,7 +107,7 @@
 #   endif
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++2b"
 #   endif
@@ -116,7 +116,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/format.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/format.version.compile.pass.cpp
index 7e18331..279361b 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/format.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/format.version.compile.pass.cpp
@@ -17,8 +17,9 @@
 
 // Test the feature test macros defined by <format>
 
-/*  Constant            Value
-    __cpp_lib_format    202106L [C++20]
+/*  Constant                   Value
+    __cpp_lib_format           202106L [C++20]
+    __cpp_lib_format_ranges    202207L [C++2b]
 */
 
 #include <format>
@@ -30,18 +31,30 @@
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_format
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_format
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
 #elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
@@ -57,6 +70,10 @@
 #   endif
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
 #elif TEST_STD_VER > 20
 
 # if !defined(_LIBCPP_VERSION)
@@ -72,5 +89,18 @@
 #   endif
 # endif
 
+# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#   ifndef __cpp_lib_format_ranges
+#     error "__cpp_lib_format_ranges should be defined in c++2b"
+#   endif
+#   if __cpp_lib_format_ranges != 202207L
+#     error "__cpp_lib_format_ranges should have the value 202207L in c++2b"
+#   endif
+# else
+#   ifdef __cpp_lib_format_ranges
+#     error "__cpp_lib_format_ranges should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)' is not met!"
+#   endif
+# endif
+
 #endif // TEST_STD_VER > 20
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.compile.pass.cpp
index 15c0920..d484504 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.compile.pass.cpp
@@ -325,17 +325,11 @@
 #   error "__cpp_lib_invoke should have the value 201411L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_VERSION)
-#   ifndef __cpp_lib_invoke_r
-#     error "__cpp_lib_invoke_r should be defined in c++2b"
-#   endif
-#   if __cpp_lib_invoke_r != 202106L
-#     error "__cpp_lib_invoke_r should have the value 202106L in c++2b"
-#   endif
-# else // _LIBCPP_VERSION
-#   ifdef __cpp_lib_invoke_r
-#     error "__cpp_lib_invoke_r should not be defined because it is unimplemented in libc++!"
-#   endif
+# ifndef __cpp_lib_invoke_r
+#   error "__cpp_lib_invoke_r should be defined in c++2b"
+# endif
+# if __cpp_lib_invoke_r != 202106L
+#   error "__cpp_lib_invoke_r should have the value 202106L in c++2b"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.compile.pass.cpp
index bf7d03b..a490a8a 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.compile.pass.cpp
@@ -20,6 +20,7 @@
                                             201811L [C++20]
     __cpp_lib_constexpr_iterator            201811L [C++20]
     __cpp_lib_make_reverse_iterator         201402L [C++14]
+    __cpp_lib_move_iterator_concept         202207L [C++20]
     __cpp_lib_nonmember_container_access    201411L [C++17]
     __cpp_lib_null_iterators                201304L [C++14]
     __cpp_lib_ranges                        202106L [C++20]
@@ -43,6 +44,10 @@
 #   error "__cpp_lib_make_reverse_iterator should not be defined before c++14"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifdef __cpp_lib_nonmember_container_access
 #   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
 # endif
@@ -76,6 +81,10 @@
 #   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++14"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifdef __cpp_lib_nonmember_container_access
 #   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
 # endif
@@ -115,6 +124,10 @@
 #   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++17"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifndef __cpp_lib_nonmember_container_access
 #   error "__cpp_lib_nonmember_container_access should be defined in c++17"
 # endif
@@ -160,6 +173,13 @@
 #   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++20"
 # endif
 
+# ifndef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should be defined in c++20"
+# endif
+# if __cpp_lib_move_iterator_concept != 202207L
+#   error "__cpp_lib_move_iterator_concept should have the value 202207L in c++20"
+# endif
+
 # ifndef __cpp_lib_nonmember_container_access
 #   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
@@ -211,6 +231,13 @@
 #   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2b"
 # endif
 
+# ifndef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should be defined in c++2b"
+# endif
+# if __cpp_lib_move_iterator_concept != 202207L
+#   error "__cpp_lib_move_iterator_concept should have the value 202207L in c++2b"
+# endif
+
 # ifndef __cpp_lib_nonmember_container_access
 #   error "__cpp_lib_nonmember_container_access should be defined in c++2b"
 # endif
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/latch.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/latch.version.compile.pass.cpp
index 3d40930..310827d 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/latch.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/latch.version.compile.pass.cpp
@@ -44,7 +44,7 @@
 
 #elif TEST_STD_VER == 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_latch
 #     error "__cpp_lib_latch should be defined in c++20"
 #   endif
@@ -53,13 +53,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_latch
-#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)' is not met!"
+#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_latch
 #     error "__cpp_lib_latch should be defined in c++2b"
 #   endif
@@ -68,7 +68,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_latch
-#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)' is not met!"
+#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
deleted file mode 100644
index 68c47df..0000000
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// WARNING: This test was generated by generate_feature_test_macro_components.py
-// and should not be edited manually.
-//
-// clang-format off
-
-// <memory_resource>
-
-// Test the feature test macros defined by <memory_resource>
-
-/*  Constant                     Value
-    __cpp_lib_memory_resource    201603L [C++17]
-*/
-
-#include <memory_resource>
-#include "test_macros.h"
-
-#if TEST_STD_VER < 14
-
-# ifdef __cpp_lib_memory_resource
-#   error "__cpp_lib_memory_resource should not be defined before c++17"
-# endif
-
-#elif TEST_STD_VER == 14
-
-# ifdef __cpp_lib_memory_resource
-#   error "__cpp_lib_memory_resource should not be defined before c++17"
-# endif
-
-#elif TEST_STD_VER == 17
-
-# ifndef __cpp_lib_memory_resource
-#   error "__cpp_lib_memory_resource should be defined in c++17"
-# endif
-# if __cpp_lib_memory_resource != 201603L
-#   error "__cpp_lib_memory_resource should have the value 201603L in c++17"
-# endif
-
-#elif TEST_STD_VER == 20
-
-# ifndef __cpp_lib_memory_resource
-#   error "__cpp_lib_memory_resource should be defined in c++20"
-# endif
-# if __cpp_lib_memory_resource != 201603L
-#   error "__cpp_lib_memory_resource should have the value 201603L in c++20"
-# endif
-
-#elif TEST_STD_VER > 20
-
-# ifndef __cpp_lib_memory_resource
-#   error "__cpp_lib_memory_resource should be defined in c++2b"
-# endif
-# if __cpp_lib_memory_resource != 201603L
-#   error "__cpp_lib_memory_resource should have the value 201603L in c++2b"
-# endif
-
-#endif // TEST_STD_VER > 20
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
index be51d6d..581875d 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
@@ -17,6 +17,7 @@
 
 /*  Constant                      Value
     __cpp_lib_ranges              202106L [C++20]
+    __cpp_lib_ranges_as_rvalue    202207L [C++2b]
     __cpp_lib_ranges_chunk        202202L [C++2b]
     __cpp_lib_ranges_chunk_by     202202L [C++2b]
     __cpp_lib_ranges_join_with    202202L [C++2b]
@@ -33,6 +34,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -59,6 +64,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -85,6 +94,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -114,6 +127,10 @@
 #   error "__cpp_lib_ranges should have the value 202106L in c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -143,6 +160,13 @@
 #   error "__cpp_lib_ranges should have the value 202106L in c++2b"
 # endif
 
+# ifndef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should be defined in c++2b"
+# endif
+# if __cpp_lib_ranges_as_rvalue != 202207L
+#   error "__cpp_lib_ranges_as_rvalue should have the value 202207L in c++2b"
+# endif
+
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges_chunk
 #     error "__cpp_lib_ranges_chunk should be defined in c++2b"
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/semaphore.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/semaphore.version.compile.pass.cpp
index f20e9e0..93240e1 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/semaphore.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/semaphore.version.compile.pass.cpp
@@ -44,7 +44,7 @@
 
 #elif TEST_STD_VER == 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_semaphore
 #     error "__cpp_lib_semaphore should be defined in c++20"
 #   endif
@@ -53,13 +53,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_semaphore
-#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)' is not met!"
+#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_semaphore
 #     error "__cpp_lib_semaphore should be defined in c++2b"
 #   endif
@@ -68,7 +68,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_semaphore
-#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)' is not met!"
+#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.compile.pass.cpp
index fdd9b01..a36f4b0 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.compile.pass.cpp
@@ -41,7 +41,7 @@
 #   error "__cpp_lib_shared_mutex should not be defined before c++17"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++14"
 #   endif
@@ -50,13 +50,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER == 17
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++17"
 #   endif
@@ -65,11 +65,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++17"
 #   endif
@@ -78,13 +78,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER == 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++20"
 #   endif
@@ -93,11 +93,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++20"
 #   endif
@@ -106,13 +106,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++2b"
 #   endif
@@ -121,11 +121,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++2b"
 #   endif
@@ -134,7 +134,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp
index 0b3bad5..5b3d4b4 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp
@@ -42,7 +42,7 @@
 
 #elif TEST_STD_VER == 20
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++20"
 #   endif
@@ -51,13 +51,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++2b"
 #   endif
@@ -66,7 +66,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.pass.cpp
deleted file mode 100644
index c3ed983..0000000
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.pass.cpp
+++ /dev/null
@@ -1,75 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// WARNING: This test was generated by generate_feature_test_macro_components.py
-// and should not be edited manually.
-//
-// clang-format off
-
-// <source_location>
-
-// Test the feature test macros defined by <source_location>
-
-/*  Constant                     Value
-    __cpp_lib_source_location    201907L [C++20]
-*/
-
-#include <source_location>
-#include "test_macros.h"
-
-#if TEST_STD_VER < 14
-
-# ifdef __cpp_lib_source_location
-#   error "__cpp_lib_source_location should not be defined before c++20"
-# endif
-
-#elif TEST_STD_VER == 14
-
-# ifdef __cpp_lib_source_location
-#   error "__cpp_lib_source_location should not be defined before c++20"
-# endif
-
-#elif TEST_STD_VER == 17
-
-# ifdef __cpp_lib_source_location
-#   error "__cpp_lib_source_location should not be defined before c++20"
-# endif
-
-#elif TEST_STD_VER == 20
-
-# if __has_builtin(__builtin_source_location)
-#   ifndef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should be defined in c++20"
-#   endif
-#   if __cpp_lib_source_location != 201907L
-#     error "__cpp_lib_source_location should have the value 201907L in c++20"
-#   endif
-# else
-#   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when __has_builtin(__builtin_source_location) is not defined!"
-#   endif
-# endif
-
-#elif TEST_STD_VER > 20
-
-# if __has_builtin(__builtin_source_location)
-#   ifndef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should be defined in c++2b"
-#   endif
-#   if __cpp_lib_source_location != 201907L
-#     error "__cpp_lib_source_location should have the value 201907L in c++2b"
-#   endif
-# else
-#   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when __has_builtin(__builtin_source_location) is not defined!"
-#   endif
-# endif
-
-#endif // TEST_STD_VER > 20
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/thread.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/thread.version.compile.pass.cpp
index 0f5c066..47f6c61 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/thread.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/thread.version.compile.pass.cpp
@@ -17,8 +17,9 @@
 
 // Test the feature test macros defined by <thread>
 
-/*  Constant             Value
-    __cpp_lib_jthread    201911L [C++20]
+/*  Constant                Value
+    __cpp_lib_formatters    202302L [C++2b]
+    __cpp_lib_jthread       201911L [C++20]
 */
 
 #include <thread>
@@ -26,24 +27,40 @@
 
 #if TEST_STD_VER < 14
 
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_jthread
 #   error "__cpp_lib_jthread should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_jthread
 #   error "__cpp_lib_jthread should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_jthread
 #   error "__cpp_lib_jthread should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 20
 
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_jthread
 #     error "__cpp_lib_jthread should be defined in c++20"
@@ -60,6 +77,19 @@
 #elif TEST_STD_VER > 20
 
 # if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_formatters
+#     error "__cpp_lib_formatters should be defined in c++2b"
+#   endif
+#   if __cpp_lib_formatters != 202302L
+#     error "__cpp_lib_formatters should have the value 202302L in c++2b"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_formatters
+#     error "__cpp_lib_formatters should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_jthread
 #     error "__cpp_lib_jthread should be defined in c++2b"
 #   endif
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/typeinfo.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/typeinfo.version.compile.pass.cpp
index 75abf3e..3cb2502 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/typeinfo.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/typeinfo.version.compile.pass.cpp
@@ -48,17 +48,11 @@
 
 #elif TEST_STD_VER > 20
 
-# if !defined(_LIBCPP_VERSION)
-#   ifndef __cpp_lib_constexpr_typeinfo
-#     error "__cpp_lib_constexpr_typeinfo should be defined in c++2b"
-#   endif
-#   if __cpp_lib_constexpr_typeinfo != 202106L
-#     error "__cpp_lib_constexpr_typeinfo should have the value 202106L in c++2b"
-#   endif
-# else // _LIBCPP_VERSION
-#   ifdef __cpp_lib_constexpr_typeinfo
-#     error "__cpp_lib_constexpr_typeinfo should not be defined because it is unimplemented in libc++!"
-#   endif
+# ifndef __cpp_lib_constexpr_typeinfo
+#   error "__cpp_lib_constexpr_typeinfo should be defined in c++2b"
+# endif
+# if __cpp_lib_constexpr_typeinfo != 202106L
+#   error "__cpp_lib_constexpr_typeinfo should have the value 202106L in c++2b"
 # endif
 
 #endif // TEST_STD_VER > 20
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
index 9c1816b..a289eeb 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
@@ -79,6 +79,8 @@
     __cpp_lib_expected                             202202L [C++2b]
     __cpp_lib_filesystem                           201703L [C++17]
     __cpp_lib_format                               202106L [C++20]
+    __cpp_lib_format_ranges                        202207L [C++2b]
+    __cpp_lib_formatters                           202302L [C++2b]
     __cpp_lib_forward_like                         202207L [C++2b]
     __cpp_lib_gcd_lcm                              201606L [C++17]
     __cpp_lib_generic_associative_lookup           201304L [C++14]
@@ -116,6 +118,7 @@
     __cpp_lib_math_constants                       201907L [C++20]
     __cpp_lib_math_special_functions               201603L [C++17]
     __cpp_lib_memory_resource                      201603L [C++17]
+    __cpp_lib_move_iterator_concept                202207L [C++20]
     __cpp_lib_move_only_function                   202110L [C++2b]
     __cpp_lib_node_extract                         201606L [C++17]
     __cpp_lib_nonmember_container_access           201411L [C++17]
@@ -128,6 +131,7 @@
     __cpp_lib_polymorphic_allocator                201902L [C++20]
     __cpp_lib_quoted_string_io                     201304L [C++14]
     __cpp_lib_ranges                               202106L [C++20]
+    __cpp_lib_ranges_as_rvalue                     202207L [C++2b]
     __cpp_lib_ranges_chunk                         202202L [C++2b]
     __cpp_lib_ranges_chunk_by                      202202L [C++2b]
     __cpp_lib_ranges_iota                          202202L [C++2b]
@@ -429,6 +433,14 @@
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_forward_like
 #   error "__cpp_lib_forward_like should not be defined before c++2b"
 # endif
@@ -577,6 +589,10 @@
 #   error "__cpp_lib_memory_resource should not be defined before c++17"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifdef __cpp_lib_move_only_function
 #   error "__cpp_lib_move_only_function should not be defined before c++2b"
 # endif
@@ -621,6 +637,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -1076,6 +1096,14 @@
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_forward_like
 #   error "__cpp_lib_forward_like should not be defined before c++2b"
 # endif
@@ -1245,6 +1273,10 @@
 #   error "__cpp_lib_memory_resource should not be defined before c++17"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifdef __cpp_lib_move_only_function
 #   error "__cpp_lib_move_only_function should not be defined before c++2b"
 # endif
@@ -1295,6 +1327,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -1377,7 +1413,7 @@
 #   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++14"
 #   endif
@@ -1386,7 +1422,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -1820,7 +1856,7 @@
 #   error "__cpp_lib_expected should not be defined before c++2b"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++17"
 #   endif
@@ -1829,7 +1865,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
@@ -1837,6 +1873,14 @@
 #   error "__cpp_lib_format should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_forward_like
 #   error "__cpp_lib_forward_like should not be defined before c++2b"
 # endif
@@ -2063,6 +2107,10 @@
 #   error "__cpp_lib_memory_resource should have the value 201603L in c++17"
 # endif
 
+# ifdef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should not be defined before c++20"
+# endif
+
 # ifdef __cpp_lib_move_only_function
 #   error "__cpp_lib_move_only_function should not be defined before c++2b"
 # endif
@@ -2134,6 +2182,10 @@
 #   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -2213,7 +2265,7 @@
 #   error "__cpp_lib_semaphore should not be defined before c++20"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++17"
 #   endif
@@ -2222,7 +2274,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -2240,7 +2292,7 @@
 #   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++17"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++17"
 #   endif
@@ -2249,7 +2301,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -2549,7 +2601,7 @@
 #   error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++20"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_atomic_wait
 #     error "__cpp_lib_atomic_wait should be defined in c++20"
 #   endif
@@ -2558,11 +2610,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)' is not met!"
+#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_barrier
 #     error "__cpp_lib_barrier should be defined in c++20"
 #   endif
@@ -2571,7 +2623,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_barrier
-#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)' is not met!"
+#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
@@ -2851,7 +2903,7 @@
 #   error "__cpp_lib_expected should not be defined before c++2b"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++20"
 #   endif
@@ -2860,7 +2912,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
@@ -2877,6 +2929,14 @@
 #   endif
 # endif
 
+# ifdef __cpp_lib_format_ranges
+#   error "__cpp_lib_format_ranges should not be defined before c++2b"
+# endif
+
+# ifdef __cpp_lib_formatters
+#   error "__cpp_lib_formatters should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_forward_like
 #   error "__cpp_lib_forward_like should not be defined before c++2b"
 # endif
@@ -3074,7 +3134,7 @@
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_latch
 #     error "__cpp_lib_latch should be defined in c++20"
 #   endif
@@ -3083,7 +3143,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_latch
-#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)' is not met!"
+#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
@@ -3163,6 +3223,13 @@
 #   error "__cpp_lib_memory_resource should have the value 201603L in c++20"
 # endif
 
+# ifndef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should be defined in c++20"
+# endif
+# if __cpp_lib_move_iterator_concept != 202207L
+#   error "__cpp_lib_move_iterator_concept should have the value 202207L in c++20"
+# endif
+
 # ifdef __cpp_lib_move_only_function
 #   error "__cpp_lib_move_only_function should not be defined before c++2b"
 # endif
@@ -3240,6 +3307,10 @@
 #   error "__cpp_lib_ranges should have the value 202106L in c++20"
 # endif
 
+# ifdef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should not be defined before c++2b"
+# endif
+
 # ifdef __cpp_lib_ranges_chunk
 #   error "__cpp_lib_ranges_chunk should not be defined before c++2b"
 # endif
@@ -3318,7 +3389,7 @@
 #   error "__cpp_lib_scoped_lock should have the value 201703L in c++20"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_semaphore
 #     error "__cpp_lib_semaphore should be defined in c++20"
 #   endif
@@ -3327,11 +3398,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_semaphore
-#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)' is not met!"
+#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++20"
 #   endif
@@ -3340,7 +3411,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -3358,7 +3429,7 @@
 #   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++20"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++20"
 #   endif
@@ -3367,7 +3438,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -3391,7 +3462,7 @@
 #   endif
 # endif
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++20"
 #   endif
@@ -3400,7 +3471,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
@@ -3742,7 +3813,7 @@
 #   error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_atomic_wait
 #     error "__cpp_lib_atomic_wait should be defined in c++2b"
 #   endif
@@ -3751,11 +3822,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)' is not met!"
+#     error "__cpp_lib_atomic_wait should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_barrier
 #     error "__cpp_lib_barrier should be defined in c++2b"
 #   endif
@@ -3764,7 +3835,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_barrier
-#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)' is not met!"
+#     error "__cpp_lib_barrier should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
@@ -3988,17 +4059,11 @@
 #   error "__cpp_lib_constexpr_tuple should have the value 201811L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_VERSION)
-#   ifndef __cpp_lib_constexpr_typeinfo
-#     error "__cpp_lib_constexpr_typeinfo should be defined in c++2b"
-#   endif
-#   if __cpp_lib_constexpr_typeinfo != 202106L
-#     error "__cpp_lib_constexpr_typeinfo should have the value 202106L in c++2b"
-#   endif
-# else // _LIBCPP_VERSION
-#   ifdef __cpp_lib_constexpr_typeinfo
-#     error "__cpp_lib_constexpr_typeinfo should not be defined because it is unimplemented in libc++!"
-#   endif
+# ifndef __cpp_lib_constexpr_typeinfo
+#   error "__cpp_lib_constexpr_typeinfo should be defined in c++2b"
+# endif
+# if __cpp_lib_constexpr_typeinfo != 202106L
+#   error "__cpp_lib_constexpr_typeinfo should have the value 202106L in c++2b"
 # endif
 
 # ifndef __cpp_lib_constexpr_utility
@@ -4083,7 +4148,7 @@
 #   error "__cpp_lib_expected should have the value 202202L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)
+# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)
 #   ifndef __cpp_lib_filesystem
 #     error "__cpp_lib_filesystem should be defined in c++2b"
 #   endif
@@ -4092,7 +4157,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_filesystem
-#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)' is not met!"
+#     error "__cpp_lib_filesystem should not be defined when the requirement '!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)' is not met!"
 #   endif
 # endif
 
@@ -4109,6 +4174,32 @@
 #   endif
 # endif
 
+# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+#   ifndef __cpp_lib_format_ranges
+#     error "__cpp_lib_format_ranges should be defined in c++2b"
+#   endif
+#   if __cpp_lib_format_ranges != 202207L
+#     error "__cpp_lib_format_ranges should have the value 202207L in c++2b"
+#   endif
+# else
+#   ifdef __cpp_lib_format_ranges
+#     error "__cpp_lib_format_ranges should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)' is not met!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_formatters
+#     error "__cpp_lib_formatters should be defined in c++2b"
+#   endif
+#   if __cpp_lib_formatters != 202302L
+#     error "__cpp_lib_formatters should have the value 202302L in c++2b"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_formatters
+#     error "__cpp_lib_formatters should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
 # ifndef __cpp_lib_forward_like
 #   error "__cpp_lib_forward_like should be defined in c++2b"
 # endif
@@ -4213,17 +4304,11 @@
 #   error "__cpp_lib_invoke should have the value 201411L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_VERSION)
-#   ifndef __cpp_lib_invoke_r
-#     error "__cpp_lib_invoke_r should be defined in c++2b"
-#   endif
-#   if __cpp_lib_invoke_r != 202106L
-#     error "__cpp_lib_invoke_r should have the value 202106L in c++2b"
-#   endif
-# else // _LIBCPP_VERSION
-#   ifdef __cpp_lib_invoke_r
-#     error "__cpp_lib_invoke_r should not be defined because it is unimplemented in libc++!"
-#   endif
+# ifndef __cpp_lib_invoke_r
+#   error "__cpp_lib_invoke_r should be defined in c++2b"
+# endif
+# if __cpp_lib_invoke_r != 202106L
+#   error "__cpp_lib_invoke_r should have the value 202106L in c++2b"
 # endif
 
 # ifndef __cpp_lib_is_aggregate
@@ -4321,7 +4406,7 @@
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_latch
 #     error "__cpp_lib_latch should be defined in c++2b"
 #   endif
@@ -4330,7 +4415,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_latch
-#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)' is not met!"
+#     error "__cpp_lib_latch should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
@@ -4410,6 +4495,13 @@
 #   error "__cpp_lib_memory_resource should have the value 201603L in c++2b"
 # endif
 
+# ifndef __cpp_lib_move_iterator_concept
+#   error "__cpp_lib_move_iterator_concept should be defined in c++2b"
+# endif
+# if __cpp_lib_move_iterator_concept != 202207L
+#   error "__cpp_lib_move_iterator_concept should have the value 202207L in c++2b"
+# endif
+
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_move_only_function
 #     error "__cpp_lib_move_only_function should be defined in c++2b"
@@ -4505,6 +4597,13 @@
 #   error "__cpp_lib_ranges should have the value 202106L in c++2b"
 # endif
 
+# ifndef __cpp_lib_ranges_as_rvalue
+#   error "__cpp_lib_ranges_as_rvalue should be defined in c++2b"
+# endif
+# if __cpp_lib_ranges_as_rvalue != 202207L
+#   error "__cpp_lib_ranges_as_rvalue should have the value 202207L in c++2b"
+# endif
+
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges_chunk
 #     error "__cpp_lib_ranges_chunk should be defined in c++2b"
@@ -4664,7 +4763,7 @@
 #   error "__cpp_lib_scoped_lock should have the value 201703L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)
 #   ifndef __cpp_lib_semaphore
 #     error "__cpp_lib_semaphore should be defined in c++2b"
 #   endif
@@ -4673,11 +4772,11 @@
 #   endif
 # else
 #   ifdef __cpp_lib_semaphore
-#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)' is not met!"
+#     error "__cpp_lib_semaphore should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)' is not met!"
 #   endif
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_mutex
 #     error "__cpp_lib_shared_mutex should be defined in c++2b"
 #   endif
@@ -4686,7 +4785,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)' is not met!"
+#     error "__cpp_lib_shared_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -4704,7 +4803,7 @@
 #   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2b"
 # endif
 
-# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)
+# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)
 #   ifndef __cpp_lib_shared_timed_mutex
 #     error "__cpp_lib_shared_timed_mutex should be defined in c++2b"
 #   endif
@@ -4713,7 +4812,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)' is not met!"
+#     error "__cpp_lib_shared_timed_mutex should not be defined when the requirement '!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)' is not met!"
 #   endif
 # endif
 
@@ -4737,7 +4836,7 @@
 #   endif
 # endif
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++2b"
 #   endif
@@ -4746,7 +4845,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.rtti/type.info/type_info.equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.rtti/type.info/type_info.equal.pass.cpp
new file mode 100644
index 0000000..3f5dd96
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.rtti/type.info/type_info.equal.pass.cpp
@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// class type_info
+//
+//  bool operator==(const type_info& rhs) const noexcept; // constexpr since C++23
+
+// UNSUPPORTED: no-rtti
+
+// When we build for Windows on top of the VC runtime, `typeinfo::operator==` may not
+// be `constexpr` (depending on the version of the VC runtime). So this test can fail.
+// UNSUPPORTED: target={{.+}}-windows-msvc && !libcpp-no-vcruntime
+
+#include <typeinfo>
+#include <cassert>
+
+#include "test_macros.h"
+
+struct Base {
+  virtual void func() {}
+};
+struct Derived : Base {
+  virtual void func() {}
+};
+
+TEST_CONSTEXPR_CXX23 bool test() {
+  // Test when storing typeid() in a const ref
+  {
+    std::type_info const& t1 = typeid(int);
+    std::type_info const& t2 = typeid(long);
+    assert(t1 == t1);
+    assert(t2 == t2);
+    assert(t1 != t2);
+  }
+
+  // Test when using `typeid()` directly
+  {
+    struct Foo { };
+    struct Bar { };
+    assert(typeid(Foo) == typeid(Foo));
+    assert(typeid(Foo) != typeid(Bar));
+  }
+
+  // Test when using typeid(object) instead of typeid(type)
+  {
+    int x = 0, y = 0;
+    long z = 0;
+    assert(typeid(x) == typeid(y));
+    assert(typeid(x) != typeid(z));
+  }
+
+  // Check with derived/base types
+  {
+    Derived derived;
+    Base const& as_base = derived;
+    assert(typeid(as_base) == typeid(Derived));
+  }
+
+  // Check noexcept-ness
+  {
+    std::type_info const& t1 = typeid(int); (void)t1;
+    std::type_info const& t2 = typeid(long); (void)t2;
+    ASSERT_NOEXCEPT(t1 == t2);
+  }
+  return true;
+}
+
+int main(int, char**) {
+  test();
+#if TEST_STD_VER >= 23
+  static_assert(test());
+#endif
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.aligned_alloc.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.aligned_alloc.compile.pass.cpp
index f6681db..1c3c546 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.aligned_alloc.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.aligned_alloc.compile.pass.cpp
@@ -13,7 +13,7 @@
 
 // ::aligned_alloc is provided by the C library, but it's marked as unavailable
 // until macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // ::aligned_alloc is not implemented on Windows
 // XFAIL: target={{.+}}-windows-{{.+}}
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.pass.cpp
index c4c8ddd..823417f 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.pass.cpp
@@ -78,7 +78,7 @@
     static_assert(!has_abs<unsigned>::value, "");
     static_assert(!has_abs<unsigned long>::value, "");
     static_assert(!has_abs<unsigned long long>::value, "");
-    static_assert(!has_abs<size_t>::value, "");
+    static_assert(!has_abs<std::size_t>::value, "");
 
     TEST_DIAGNOSTIC_POP
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/ctime.timespec.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/ctime.timespec.compile.pass.cpp
index 37c7b67..9a512f6 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/ctime.timespec.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.runtime/ctime.timespec.compile.pass.cpp
@@ -15,7 +15,7 @@
 
 // ::timespec_get is provided by the C library, but it's marked as
 // unavailable until macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // ::timespec_get is available starting with Android Q (API 29)
 // XFAIL: target={{.+}}-android{{(eabi)?(21|22|23|24|25|26|27|28)}}
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.srcloc/general.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.srcloc/general.pass.cpp
index 39ad936..70861ee 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.srcloc/general.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.srcloc/general.pass.cpp
@@ -43,8 +43,8 @@
 ASSERT_NOEXCEPT(empty.column());
 ASSERT_NOEXCEPT(empty.file_name());
 ASSERT_NOEXCEPT(empty.function_name());
-std::same_as<uint_least32_t> auto line   = empty.line();
-std::same_as<uint_least32_t> auto column = empty.column();
+std::same_as<std::uint_least32_t> auto line   = empty.line();
+std::same_as<std::uint_least32_t> auto column = empty.column();
 std::same_as<const char*> auto file      = empty.file_name();
 std::same_as<const char*> auto function  = empty.function_name();
 
diff --git a/third_party/llvm-project/libcxx/test/std/language.support/support.types/max_align_t.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/language.support/support.types/max_align_t.compile.pass.cpp
index aef00bb..5e33584 100644
--- a/third_party/llvm-project/libcxx/test/std/language.support/support.types/max_align_t.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/language.support/support.types/max_align_t.compile.pass.cpp
@@ -26,5 +26,5 @@
 static_assert(alignof(std::max_align_t) >= alignof(void*), "");
 #if TEST_STD_VER > 14
 static_assert(alignof(std::max_align_t) <= __STDCPP_DEFAULT_NEW_ALIGNMENT__,
-              "max_align_t alignment should be no larger than operator new's alignment");
+              "std::max_align_t alignment should be no larger than operator new's alignment");
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
index 060f179..e6c0e09 100644
--- a/third_party/llvm-project/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
@@ -7,6 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// TODO: make `join_view` non-experimental once D2770 is implemented.
+// UNSUPPORTED: !c++experimental
 
 // [customization.point.object]
 // [range.adaptor.object] "A range adaptor object is a customization point object..."
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
index 7f85dee..8fe8080 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
@@ -26,7 +26,7 @@
     typedef F::mask mask;
     const mask *p = F::classic_table();
 
-    for ( size_t i = 0; i < 128; ++i ) // values above 128 are not consistent
+    for ( std::size_t i = 0; i < 128; ++i ) // values above 128 are not consistent
     {
 
         bool expect_cntrl = (i < 32 || 126 < i);
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/table_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/table_size.pass.cpp
index 4017b94..bbfbe5d 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/table_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/table_size.pass.cpp
@@ -14,8 +14,8 @@
 
 // Before https://llvm.org/D110647, the shared library did not contain
 // std::ctype<char>::table_size, so this test fails with a link error.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0|13.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{11.0|12.0|13.0}}
 
 #include <locale>
 #include <cassert>
@@ -24,7 +24,7 @@
 
 int main(int, char**) {
   typedef std::ctype<char> F;
-  const size_t* G = &F::table_size;
+  const std::size_t* G = &F::table_size;
   assert(*G >= 256);
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char16_t_char.depr_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char16_t_char.depr_in_cxx20.verify.cpp
index c430321..5beeed9 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char16_t_char.depr_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char16_t_char.depr_in_cxx20.verify.cpp
@@ -16,14 +16,10 @@
 #include <locale>
 
 #include "../with_public_dtor.hpp"
-#include "test_macros.h"
 
-int main(int, char **)
-{
+void f() {
     // Don't test for the exact type since the underlying type of
     // std::mbstate_t depends on implementation details.
     with_public_dtor<std::codecvt_byname<char16_t, char, std::mbstate_t>> cvt("", 0); // expected-warning-re {{'codecvt_byname<char16_t, char, {{.*}}>' is deprecated}}
     (void)cvt;
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char32_t_char.depr_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char32_t_char.depr_in_cxx20.verify.cpp
index ebace3a..1cf0ae3 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char32_t_char.depr_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/codecvt_byname_char32_t_char.depr_in_cxx20.verify.cpp
@@ -16,14 +16,10 @@
 #include <locale>
 
 #include "../with_public_dtor.hpp"
-#include "test_macros.h"
 
-int main(int, char **)
-{
+void f() {
     // Don't test for the exact type since the underlying type of
     // std::mbstate_t depends on implementation details.
     with_public_dtor<std::codecvt_byname<char32_t, char, std::mbstate_t>> cvt("", 0); // expected-warning-re {{'codecvt_byname<char32_t, char, {{.*}}>' is deprecated}}
     (void)cvt;
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
index a910eb4..209d9a9 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
index d0b74a0..7d2eb4c 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char16_t_char.depr_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char16_t_char.depr_in_cxx20.verify.cpp
index 54f57c6..cc9c355 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char16_t_char.depr_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char16_t_char.depr_in_cxx20.verify.cpp
@@ -16,14 +16,10 @@
 #include <locale>
 
 #include "../with_public_dtor.hpp"
-#include "test_macros.h"
 
-int main(int, char **)
-{
+void f() {
     // Don't test for the exact type since the underlying type of
     // std::mbstate_t depends on implementation details.
     with_public_dtor<std::codecvt<char16_t, char, std::mbstate_t>> cvt("", 0); // expected-warning-re {{'codecvt<char16_t, char, {{.*}}>' is deprecated}}
     (void)cvt;
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char32_t_char.depr_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char32_t_char.depr_in_cxx20.verify.cpp
index 9b7fdc5..7cbfbd3 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char32_t_char.depr_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_char32_t_char.depr_in_cxx20.verify.cpp
@@ -16,14 +16,10 @@
 #include <locale>
 
 #include "../with_public_dtor.hpp"
-#include "test_macros.h"
 
-int main(int, char **)
-{
+void f() {
     // Don't test for the exact type since the underlying type of
     // std::mbstate_t depends on implementation details.
     with_public_dtor<std::codecvt<char32_t, char, std::mbstate_t>> cvt("", 0); // expected-warning-re {{'codecvt<char32_t, char, {{.*}}>' is deprecated}}
     (void)cvt;
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
index 54a5846..734c3e9 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
index 0599e05..b4a93fe 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
index 382c184..cb2c0bc 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
index 3db1619..b008ecf 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
index 5639305..c34e864 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
index 24b0c4a..d72a154 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
index 519446d..c16c15d 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
index 3ae5b8b..c39e64d 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
index d27c1d2..bf18de2 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
index eb208b0..25d1ffe 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
index 8aeec78..8ac8ccd 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
index cb05562..e848f8a 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
index 57b76c4..725b2da 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
index 9d3adca..beb6195 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
index 28f0309..7a31c9e 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
index 4eacd50..eaa6373 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
index 03185d3..07789ca 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
index 82d7e68..31f28b5 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
index 233a2c3..7224260 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
index 45270d1..a180848 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
@@ -15,7 +15,7 @@
 
 // This test exercises the fix for PR28704, which isn't in the dylib for
 // some systems.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 #include <locale>
 #include <ios>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
index 5aa2fe6..5eb7c92 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
@@ -84,7 +84,7 @@
         ++value;
         std::string std_str = make_neg_string(value);
         const char* str = std_str.data();
-        size_t size = std_str.size();
+        std::size_t size = std_str.size();
         std::ios_base::iostate err = ios.goodbit;
         cpp17_input_iterator<const char*> iter =
             f.get(cpp17_input_iterator<const char*>(str),
@@ -102,7 +102,7 @@
         ++value;
         std::string std_str = make_neg_string(value);
         const char* str = std_str.data();
-        size_t size = std_str.size();
+        std::size_t size = std_str.size();
         std::ios_base::iostate err = ios.goodbit;
         cpp17_input_iterator<const char*> iter =
             f.get(cpp17_input_iterator<const char*>(str),
@@ -118,7 +118,7 @@
         T value = std::numeric_limits<T>::max();
         std::string std_str = make_neg_string(value);
         const char* str = std_str.data();
-        size_t size = std_str.size();
+        std::size_t size = std_str.size();
         std::ios_base::iostate err = ios.goodbit;
         cpp17_input_iterator<const char*> iter =
             f.get(cpp17_input_iterator<const char*>(str),
@@ -134,7 +134,7 @@
         std::string std_str = make_neg_string(std::numeric_limits<T>::max());
         std_str.back()++;
         const char* str = std_str.data();
-        size_t size = std_str.size();
+        std::size_t size = std_str.size();
         std::ios_base::iostate err = ios.goodbit;
         cpp17_input_iterator<const char*> iter =
             f.get(cpp17_input_iterator<const char*>(str),
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
index 53172e7..bf2f8af 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
@@ -26,7 +26,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
index ac3daf4..e9c19e5 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
@@ -25,7 +25,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
index 2a6936a..24b1d22 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
@@ -28,7 +28,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
index 37cc10a..0d52894 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
@@ -26,7 +26,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
index 6279dce..32fdde3 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
@@ -25,7 +25,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
index 7d124c9..22636ca 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
@@ -28,7 +28,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
index d7776b3..24eb2df 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
@@ -28,7 +28,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
index c208dc3..b9eeb6a 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
@@ -28,7 +28,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/classification/isblank.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/classification/isblank.pass.cpp
new file mode 100644
index 0000000..2a5cc19
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/classification/isblank.pass.cpp
@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// template <class charT> bool isblank (charT c, const locale& loc);
+
+#include <locale>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**) {
+  std::locale l;
+  assert(std::isblank(' ', l));
+  assert(!std::isblank('<', l));
+  assert(!std::isblank('\x8', l));
+  assert(!std::isblank('A', l));
+  assert(!std::isblank('a', l));
+  assert(!std::isblank('z', l));
+  assert(!std::isblank('3', l));
+  assert(!std::isblank('.', l));
+  assert(!std::isblank('f', l));
+  assert(!std::isblank('9', l));
+  assert(!std::isblank('+', l));
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
index e1b1f69..2861e4a 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
@@ -22,7 +22,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
index 157b745..ac614b0 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
@@ -25,7 +25,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
index 52c5897..4f3b931 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
@@ -25,7 +25,7 @@
 
 #include "test_macros.h"
 
-template <class CharT, size_t = sizeof(CharT)>
+template <class CharT, std::size_t = sizeof(CharT)>
 struct TestHelper;
 template <class CharT>
 struct TestHelper<CharT, 2> {
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
index 87c7ec2..1dea0b0 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.ru_RU.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
index 7c29d9c..99131dd 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
@@ -12,9 +12,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // REQUIRES: locale.zh_CN.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
index 09e4e45..04d72f6 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.fr_FR.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
index 2035f5d..f0086ad 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.en_US.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
index 3a4bc23..0581dcf 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
index 8482f49..beeba43 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.ru_RU.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
index 4337362..bfd38d7 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
index ee39910..8e433cb 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
index 1296b74..4de61f4 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
@@ -9,9 +9,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // REQUIRES: locale.zh_CN.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
index 811c47c..4463dad 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
index 72801e3..dcf4bc6 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
index b8bfa69..1ac36ef 100644
--- a/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.en_US.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.endian/endian.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.endian/endian.pass.cpp
index ecba960..fa02afe 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.endian/endian.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.endian/endian.pass.cpp
@@ -12,9 +12,9 @@
 // <bit>
 
 #include <bit>
-#include <cstring>
 #include <cassert>
 #include <cstdint>
+#include <cstring>
 #include <type_traits>
 
 #include "test_macros.h"
@@ -38,7 +38,7 @@
 
 //  Try to check at runtime
     {
-    uint32_t i = 0x01020304;
+    std::uint32_t i = 0x01020304;
     char c[4];
     static_assert(sizeof(i) == sizeof(c));
     std::memcpy(c, &i, sizeof(c));
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
index fab7d78..71902b7 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
@@ -39,13 +39,13 @@
     static_assert(toobig<unsigned long>(),      ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
     static_assert(toobig<unsigned long long>(), ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
 
-    static_assert(toobig<uint8_t>(), "");   // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<uint16_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<uint32_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<uint64_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<size_t>(), "");    // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<uintmax_t>(), ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    static_assert(toobig<uintptr_t>(), ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uint8_t>(), "");   // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uint16_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uint32_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uint64_t>(), "");  // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::size_t>(), "");    // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uintmax_t>(), ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+    static_assert(toobig<std::uintptr_t>(), ""); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.pass.cpp
index f18d52a..4e794f1 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.pass.cpp
@@ -84,13 +84,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -115,13 +115,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -131,13 +131,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_floor.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_floor.pass.cpp
index f843fff..06ee38c 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_floor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_floor.pass.cpp
@@ -81,13 +81,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -113,13 +113,13 @@
     static_assert(test<__uint128_t>());
 #endif
 
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -130,13 +130,13 @@
     test<__uint128_t>();
 #endif
 
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_width.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_width.pass.cpp
index 23aad27..cfb9a16 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_width.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/bit_width.pass.cpp
@@ -86,13 +86,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -117,13 +117,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -133,13 +133,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/has_single_bit.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/has_single_bit.pass.cpp
index 1a20a4c..7b23627 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/has_single_bit.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bit.pow.two/has_single_bit.pass.cpp
@@ -84,13 +84,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -115,13 +115,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -131,13 +131,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp
index ab82d03..bbce57b 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp
@@ -81,13 +81,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -112,13 +112,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -128,13 +128,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_zero.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_zero.pass.cpp
index 2a23e9b..f103450 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_zero.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countl_zero.pass.cpp
@@ -80,13 +80,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -111,13 +111,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -127,13 +127,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_one.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_one.pass.cpp
index 467d034..8e8ef1d 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_one.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_one.pass.cpp
@@ -85,13 +85,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -116,13 +116,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -132,13 +132,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_zero.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_zero.pass.cpp
index 149ca27..d0fdf92 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_zero.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/countr_zero.pass.cpp
@@ -82,13 +82,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -113,13 +113,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -129,13 +129,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/popcount.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/popcount.pass.cpp
index 96c5fd4..b8759c4 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/popcount.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.count/popcount.pass.cpp
@@ -92,13 +92,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -123,13 +123,13 @@
 #ifndef TEST_HAS_NO_INT128
     static_assert(test<__uint128_t>());
 #endif
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -139,13 +139,13 @@
 #ifndef TEST_HAS_NO_INT128
     test<__uint128_t>();
 #endif
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotl.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotl.pass.cpp
index e82388d..9592db6 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotl.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotl.pass.cpp
@@ -80,13 +80,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -112,13 +112,13 @@
     static_assert(test<__uint128_t>());
 #endif
 
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -129,13 +129,13 @@
     test<__uint128_t>();
 #endif
 
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotr.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotr.pass.cpp
index 0545874..9575254 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/bitops.rot/rotr.pass.cpp
@@ -81,13 +81,13 @@
     static_assert(!std::is_invocable_v<L, __int128_t>);
 #endif
 
-    static_assert(!std::is_invocable_v<L, int8_t>);
-    static_assert(!std::is_invocable_v<L, int16_t>);
-    static_assert(!std::is_invocable_v<L, int32_t>);
-    static_assert(!std::is_invocable_v<L, int64_t>);
-    static_assert(!std::is_invocable_v<L, intmax_t>);
-    static_assert(!std::is_invocable_v<L, intptr_t>);
-    static_assert(!std::is_invocable_v<L, ptrdiff_t>);
+    static_assert(!std::is_invocable_v<L, std::int8_t>);
+    static_assert(!std::is_invocable_v<L, std::int16_t>);
+    static_assert(!std::is_invocable_v<L, std::int32_t>);
+    static_assert(!std::is_invocable_v<L, std::int64_t>);
+    static_assert(!std::is_invocable_v<L, std::intmax_t>);
+    static_assert(!std::is_invocable_v<L, std::intptr_t>);
+    static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
 
     static_assert(!std::is_invocable_v<L, bool>);
     static_assert(!std::is_invocable_v<L, char>);
@@ -113,13 +113,13 @@
     static_assert(test<__uint128_t>());
 #endif
 
-    static_assert(test<uint8_t>());
-    static_assert(test<uint16_t>());
-    static_assert(test<uint32_t>());
-    static_assert(test<uint64_t>());
-    static_assert(test<uintmax_t>());
-    static_assert(test<uintptr_t>());
-    static_assert(test<size_t>());
+    static_assert(test<std::uint8_t>());
+    static_assert(test<std::uint16_t>());
+    static_assert(test<std::uint32_t>());
+    static_assert(test<std::uint64_t>());
+    static_assert(test<std::uintmax_t>());
+    static_assert(test<std::uintptr_t>());
+    static_assert(test<std::size_t>());
 
     test<unsigned char>();
     test<unsigned short>();
@@ -130,13 +130,13 @@
     test<__uint128_t>();
 #endif
 
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
-    test<uintmax_t>();
-    test<uintptr_t>();
-    test<size_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
+    test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/bit/byteswap.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/bit/byteswap.pass.cpp
index bd73515..b87faf1 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/bit/byteswap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/bit/byteswap.pass.cpp
@@ -54,15 +54,15 @@
 }
 
 constexpr bool test() {
-  test_num<uint8_t>(0xAB, 0xAB);
-  test_num<uint16_t>(0xCDEF, 0xEFCD);
-  test_num<uint32_t>(0x01234567, 0x67452301);
-  test_num<uint64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
+  test_num<std::uint8_t>(0xAB, 0xAB);
+  test_num<std::uint16_t>(0xCDEF, 0xEFCD);
+  test_num<std::uint32_t>(0x01234567, 0x67452301);
+  test_num<std::uint64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
 
-  test_num<int8_t>(static_cast<int8_t>(0xAB), static_cast<int8_t>(0xAB));
-  test_num<int16_t>(static_cast<int16_t>(0xCDEF), static_cast<int16_t>(0xEFCD));
-  test_num<int32_t>(0x01234567, 0x67452301);
-  test_num<int64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
+  test_num<std::int8_t>(static_cast<std::int8_t>(0xAB), static_cast<std::int8_t>(0xAB));
+  test_num<std::int16_t>(static_cast<std::int16_t>(0xCDEF), static_cast<std::int16_t>(0xEFCD));
+  test_num<std::int32_t>(0x01234567, 0x67452301);
+  test_num<std::int64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
 
 #ifndef TEST_HAS_NO_INT128
   const auto in = static_cast<__uint128_t>(0x0123456789ABCDEF) << 64 | 0x13579BDF02468ACE;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/c.math/cmath.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/c.math/cmath.pass.cpp
index c867472..e2062cc 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/c.math/cmath.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/c.math/cmath.pass.cpp
@@ -133,7 +133,7 @@
     static_assert(!has_abs<unsigned>::value, "");
     static_assert(!has_abs<unsigned long>::value, "");
     static_assert(!has_abs<unsigned long long>::value, "");
-    static_assert(!has_abs<size_t>::value, "");
+    static_assert(!has_abs<std::size_t>::value, "");
 
     TEST_DIAGNOSTIC_POP
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isfinite.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isfinite.pass.cpp
index fd2ad11..6bbc3aa 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isfinite.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isfinite.pass.cpp
@@ -63,8 +63,8 @@
 };
 
 int main(int, char**) {
-  meta::for_each(meta::floating_point_types(), TestFloat());
-  meta::for_each(meta::integral_types(), TestInt());
+  types::for_each(types::floating_point_types(), TestFloat());
+  types::for_each(types::integral_types(), TestInt());
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isinf.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isinf.pass.cpp
index 3b1e54f..e935b53 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isinf.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isinf.pass.cpp
@@ -63,8 +63,8 @@
 };
 
 int main(int, char**) {
-  meta::for_each(meta::floating_point_types(), TestFloat());
-  meta::for_each(meta::integral_types(), TestInt());
+  types::for_each(types::floating_point_types(), TestFloat());
+  types::for_each(types::integral_types(), TestInt());
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnan.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnan.pass.cpp
index c8ac055..fffb124 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnan.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnan.pass.cpp
@@ -63,8 +63,8 @@
 };
 
 int main(int, char**) {
-  meta::for_each(meta::floating_point_types(), TestFloat());
-  meta::for_each(meta::integral_types(), TestInt());
+  types::for_each(types::floating_point_types(), TestFloat());
+  types::for_each(types::integral_types(), TestInt());
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnormal.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
index 681438e..c3b8f31 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
@@ -63,8 +63,8 @@
 };
 
 int main(int, char**) {
-  meta::for_each(meta::floating_point_types(), TestFloat());
-  meta::for_each(meta::integral_types(), TestInt());
+  types::for_each(types::floating_point_types(), TestFloat());
+  types::for_each(types::integral_types(), TestInt());
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/deduct.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/deduct.pass.cpp
index 80ac2ae..e664b6a 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/deduct.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/deduct.pass.cpp
@@ -64,7 +64,7 @@
     {
         // From (indirect_array<T>)
         std::valarray<long> v = {1, 2, 3, 4, 5};
-        std::valarray<size_t> i = {1, 2, 3};
+        std::valarray<std::size_t> i = {1, 2, 3};
         std::valarray v2 = v[i];
         static_assert(std::is_same_v<decltype(v2), std::valarray<long>>);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
index 4c87bd4..21d4ee1 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
@@ -21,7 +21,7 @@
     S() : x(1) {}
     ~S() { ++cnt_dtor; }
     int x;
-    static size_t cnt_dtor;
+    static std::size_t cnt_dtor;
 };
 
 size_t S::cnt_dtor = 0;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numbers/illformed.verify.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numbers/illformed.verify.cpp
index 213f98c..8f19718 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numbers/illformed.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numbers/illformed.verify.cpp
@@ -11,8 +11,7 @@
 #include <numbers>
 
 // Initializing the primary template is ill-formed.
-int log2e{std::numbers::log2e_v<
-    int>}; // expected-error-re@numbers:* {{{{(static_assert|static assertion)}} failed{{.*}}A program that instantiates a primary template of a mathematical constant variable template is ill-formed.}}
+int log2e{std::numbers::log2e_v<int>}; // expected-error-re@numbers:* {{{{(static_assert|static assertion)}} failed{{.*}}A program that instantiates a primary template of a mathematical constant variable template is ill-formed.}}
 int log10e{std::numbers::log10e_v<int>};
 int pi{std::numbers::pi_v<int>};
 int inv_pi{std::numbers::inv_pi_v<int>};
@@ -24,5 +23,3 @@
 int inv_sqrt3{std::numbers::inv_sqrt3_v<int>};
 int egamma{std::numbers::egamma_v<int>};
 int phi{std::numbers::phi_v<int>};
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
index 69f25fc..bef2dd7 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
@@ -57,33 +57,33 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
-    std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{50});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{50});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 50 + i * 3);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
-    std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{30});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{30});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 30 + triangle(i-1));
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
-    std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{40});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{40});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 40 + triangle(i));
     }
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
index 53698b1..ca2de4a 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
@@ -77,13 +77,13 @@
     {
     std::array<unsigned char, 10> v;
     std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
-    std::array<size_t, 10> res;
+    std::array<std::size_t, 10> res;
     std::exclusive_scan(v.begin(), v.end(), res.begin(), 1, std::multiplies<>());
 
     assert(res.size() == 10);
-    size_t j = 1;
+    std::size_t j = 1;
     assert(res[0] == 1);
-    for (size_t i = 1; i < v.size(); ++i)
+    for (std::size_t i = 1; i < v.size(); ++i)
     {
         j *= i;
         assert(res[i] == j);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
index 6e00506..299d085 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
@@ -58,38 +58,38 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
     std::inclusive_scan(v.begin(), v.end(), v.begin());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == (i+1) * 3);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
     std::inclusive_scan(v.begin(), v.end(), v.begin());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i));
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
     std::inclusive_scan(v.begin(), v.end(), v.begin());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i + 1));
     }
 
     {
-    std::array<size_t, 0> v, res;
+    std::array<std::size_t, 0> v, res;
     std::inclusive_scan(v.begin(), v.end(), res.begin());
     assert(res.empty());
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
index 5e33394..87bea92 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
@@ -62,38 +62,38 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == (i+1) * 3);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i));
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i + 1));
     }
 
     {
-    std::array<size_t, 0> v, res;
+    std::array<std::size_t, 0> v, res;
     std::inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>());
     assert(res.empty());
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
index f7c2be2..2e21d38 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
@@ -62,39 +62,39 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
-    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{50});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), std::size_t{50});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 50 + (i+1) * 3);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
-    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{40});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), std::size_t{40});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 40 + triangle(i));
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
-    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{30});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), std::size_t{30});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 30 + triangle(i + 1));
     }
 
     {
-    std::array<size_t, 0> v, res;
-    std::inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), size_t{40});
+    std::array<std::size_t, 0> v, res;
+    std::inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), std::size_t{40});
     assert(res.empty());
     }
 
@@ -102,13 +102,13 @@
     {
     std::array<unsigned char, 10> v;
     std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
-    std::array<size_t, 10> res;
-    std::inclusive_scan(v.begin(), v.end(), res.begin(), std::multiplies<>(), size_t{1});
+    std::array<std::size_t, 10> res;
+    std::inclusive_scan(v.begin(), v.end(), res.begin(), std::multiplies<>(), std::size_t{1});
 
     assert(res.size() == 10);
-    size_t j = 1;
+    std::size_t j = 1;
     assert(res[0] == 1);
-    for (size_t i = 1; i < v.size(); ++i)
+    for (std::size_t i = 1; i < v.size(); ++i)
     {
         j *= i + 1;
         assert(res[i] == j);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.integer.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.integer.pass.cpp
index 599b328..c506d07 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.integer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.integer.pass.cpp
@@ -18,6 +18,7 @@
 #include <numeric>
 #include <cassert>
 #include <cstddef>
+#include <cstdint>
 #include "test_macros.h"
 
 template <typename T>
@@ -114,10 +115,10 @@
     signed_test<long>();
     signed_test<long long>();
 
-    signed_test<int8_t>();
-    signed_test<int16_t>();
-    signed_test<int32_t>();
-    signed_test<int64_t>();
+    signed_test<std::int8_t>();
+    signed_test<std::int16_t>();
+    signed_test<std::int32_t>();
+    signed_test<std::int64_t>();
 
     unsigned_test<unsigned char>();
     unsigned_test<unsigned short>();
@@ -125,10 +126,10 @@
     unsigned_test<unsigned long>();
     unsigned_test<unsigned long long>();
 
-    unsigned_test<uint8_t>();
-    unsigned_test<uint16_t>();
-    unsigned_test<uint32_t>();
-    unsigned_test<uint64_t>();
+    unsigned_test<std::uint8_t>();
+    unsigned_test<std::uint16_t>();
+    unsigned_test<std::uint32_t>();
+    unsigned_test<std::uint64_t>();
 
 #ifndef TEST_HAS_NO_INT128
     unsigned_test<__uint128_t>();
@@ -136,8 +137,8 @@
 #endif
 
 //     int_test<char>();
-    signed_test<ptrdiff_t>();
-    unsigned_test<size_t>();
+    signed_test<std::ptrdiff_t>();
+    unsigned_test<std::size_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
index 9ab546a..5227220 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
@@ -88,39 +88,39 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
-    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), size_t{50}, std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{50}, std::plus<>(), add_one{});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 50 + i * 4);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
-    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), size_t{30}, std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{30}, std::plus<>(), add_one{});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 30 + triangle(i - 1) + i);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
-    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), size_t{40}, std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_exclusive_scan(v.begin(), v.end(), v.begin(), std::size_t{40}, std::plus<>(), add_one{});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 40 + triangle(i) + i);
     }
 
     {
-    std::array<size_t, 0> v, res;
-    std::transform_exclusive_scan(v.begin(), v.end(), res.begin(), size_t{40}, std::plus<>(), add_one{});
+    std::array<std::size_t, 0> v, res;
+    std::transform_exclusive_scan(v.begin(), v.end(), res.begin(), std::size_t{40}, std::plus<>(), add_one{});
     assert(res.empty());
     }
 
@@ -128,13 +128,13 @@
     {
     std::array<unsigned char, 10> v;
     std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
-    std::array<size_t, 10> res;
-    std::transform_exclusive_scan(v.begin(), v.end(), res.begin(), size_t{1}, std::multiplies<>(), add_one{});
+    std::array<std::size_t, 10> res;
+    std::transform_exclusive_scan(v.begin(), v.end(), res.begin(), std::size_t{1}, std::multiplies<>(), add_one{});
 
     assert(res.size() == 10);
-    size_t j = 1;
+    std::size_t j = 1;
     assert(res[0] == 1);
-    for (size_t i = 1; i < res.size(); ++i)
+    for (std::size_t i = 1; i < res.size(); ++i)
     {
         j *= i + 1;
         assert(res[i] == j);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
index d4a95bf..80ead01 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
@@ -77,38 +77,38 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
     std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == (i+1) * 4);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
     std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i) + i + 1);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
     std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{});
-    for (size_t i = 0; i < v.size(); ++i)
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == triangle(i + 1) + i + 1);
     }
 
     {
-    std::array<size_t, 0> v, res;
+    std::array<std::size_t, 0> v, res;
     std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), add_one{});
     assert(res.empty());
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
index 7d89c5b..18be676 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
@@ -90,39 +90,39 @@
     }
 }
 
-constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
+constexpr std::size_t triangle(size_t n) { return n*(n+1)/2; }
 
 //  Basic sanity
 TEST_CONSTEXPR_CXX20 void
 basic_tests()
 {
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::fill(v.begin(), v.end(), 3);
-    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{50});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, std::size_t{50});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 50 + (i + 1) * 4);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 0);
-    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{30});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, std::size_t{30});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 30 + triangle(i) + i + 1);
     }
 
     {
-    std::array<size_t, 10> v;
+    std::array<std::size_t, 10> v;
     std::iota(v.begin(), v.end(), 1);
-    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{40});
-    for (size_t i = 0; i < v.size(); ++i)
+    std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, std::size_t{40});
+    for (std::size_t i = 0; i < v.size(); ++i)
         assert(v[i] == 40 + triangle(i + 1) + i + 1);
     }
 
     {
-    std::array<size_t, 0> v, res;
-    std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), add_one{}, size_t{1});
+    std::array<std::size_t, 0> v, res;
+    std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), add_one{}, std::size_t{1});
     assert(res.empty());
     }
 
@@ -130,13 +130,13 @@
     {
     std::array<unsigned char, 10> v;
     std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
-    std::array<size_t, 10> res;
-    std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::multiplies<>(), add_one{}, size_t{1});
+    std::array<std::size_t, 10> res;
+    std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::multiplies<>(), add_one{}, std::size_t{1});
 
     assert(res.size() == 10);
-    size_t j = 2;
+    std::size_t j = 2;
     assert(res[0] == 2);
-    for (size_t i = 1; i < res.size(); ++i)
+    for (std::size_t i = 1; i < res.size(); ++i)
     {
         j *= i + 2;
         assert(res[i] == j);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
index b92a583..a2d46ab 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
@@ -7,12 +7,11 @@
 //===----------------------------------------------------------------------===//
 
 // See https://llvm.org/PR20183
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // The behavior of std::random_device changed on Apple platforms with
 // https://llvm.org/D116045.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 // UNSUPPORTED: no-random-device
 
@@ -30,6 +29,7 @@
 // throw.
 
 #include <random>
+#include <string>
 #include <system_error>
 #include <cassert>
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/eval.pass.cpp
index 3339a54..9c385b3 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.device/eval.pass.cpp
@@ -16,6 +16,7 @@
 
 #include <random>
 #include <cassert>
+#include <string>
 #include <system_error>
 
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
index 2e8bfae..dbdd097 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
@@ -15,10 +15,12 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
-#include <random>
-#include <numeric>
-#include <vector>
 #include <cassert>
+#include <cstdint>
+#include <numeric>
+#include <random>
+#include <type_traits>
+#include <vector>
 
 #include "test_macros.h"
 
@@ -527,8 +529,8 @@
     tests<unsigned long long>();
 
 #if defined(_LIBCPP_VERSION) // extension
-    tests<int8_t>();
-    tests<uint8_t>();
+    tests<std::int8_t>();
+    tests<std::uint8_t>();
 #if !defined(TEST_HAS_NO_INT128)
     tests<__int128_t>();
     tests<__uint128_t>();
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
index deccad1..440334e 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
@@ -15,10 +15,11 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
-#include <random>
-#include <numeric>
-#include <vector>
 #include <cassert>
+#include <cstdint>
+#include <numeric>
+#include <random>
+#include <vector>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
index 6aef9b4..5feb2e5 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
@@ -15,13 +15,13 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
-#include <random>
-
 #include <cassert>
 #include <cmath>
+#include <cstdint>
 #include <limits>
-#include <vector>
 #include <numeric>
+#include <random>
+#include <vector>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
index d52e23e..762acd4 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
@@ -15,9 +15,11 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
+#include <cassert>
+#include <cstdint>
+#include <cstdlib>
 #include <random>
 #include <vector>
-#include <cassert>
 
 #include "test_macros.h"
 
@@ -305,8 +307,8 @@
     tests<unsigned long long>();
 
 #if defined(_LIBCPP_VERSION) // extension
-    tests<int8_t>();
-    tests<uint8_t>();
+    tests<std::int8_t>();
+    tests<std::uint8_t>();
 #if !defined(TEST_HAS_NO_INT128)
     tests<__int128_t>();
     tests<__uint128_t>();
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
index f058e68..cee3dbf 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
@@ -15,11 +15,10 @@
 
 // template<class _URNG> result_type operator()(_URNG& g, const param_type& parm);
 
+#include <cassert>
+#include <cstdlib>
 #include <random>
 #include <vector>
-#include <cassert>
-
-#include "test_macros.h"
 
 int main(int, char**)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
index c24d1a4..e11b235 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
@@ -40,7 +40,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {25, 62.5, 12.5};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
@@ -60,7 +60,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -103,7 +103,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {0, 62.5, 12.5};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
@@ -123,7 +123,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -166,7 +166,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {25, 0, 12.5};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
@@ -186,7 +186,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -229,7 +229,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {25, 62.5, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
@@ -249,7 +249,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -292,7 +292,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {25, 0, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -312,7 +312,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -355,7 +355,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {0, 25, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -375,7 +375,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -418,7 +418,7 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {0, 0, 1};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -438,7 +438,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -481,7 +481,7 @@
     G g;
     double b[] = {10, 14, 16};
     double p[] = {75, 25};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -501,7 +501,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -544,7 +544,7 @@
     G g;
     double b[] = {10, 14, 16};
     double p[] = {0, 25};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -564,7 +564,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -607,7 +607,7 @@
     G g;
     double b[] = {10, 14, 16};
     double p[] = {1, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -627,7 +627,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
@@ -670,7 +670,7 @@
     G g;
     double b[] = {10, 14};
     double p[] = {1};
-    const size_t Np = sizeof(p) / sizeof(p[0]);
+    const std::size_t Np = sizeof(p) / sizeof(p[0]);
     D d(b, b+Np+1, p);
     const int N = 100000;
     std::vector<D::result_type> u;
@@ -690,7 +690,7 @@
         typedef std::vector<D::result_type>::iterator I;
         I lb = std::lower_bound(u.begin(), u.end(), b[i]);
         I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-        const size_t Ni = ub - lb;
+        const std::size_t Ni = ub - lb;
         if (prob[i] == 0)
             assert(Ni == 0);
         else
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
index d9f2628..d3964ce 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
@@ -42,7 +42,7 @@
         G g;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d;
         P pa(b, b+Np+1, p);
         const int N = 1000000;
@@ -63,7 +63,7 @@
             typedef std::vector<D::result_type>::iterator I;
             I lb = std::lower_bound(u.begin(), u.end(), b[i]);
             I ub = std::lower_bound(u.begin(), u.end(), b[i+1]);
-            const size_t Ni = ub - lb;
+            const std::size_t Ni = ub - lb;
             if (prob[i] == 0)
                 assert(Ni == 0);
             else
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
index db7c0d6..e3458fe 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
@@ -25,7 +25,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P pa(b, b+Np+1, p);
         D d(pa);
         assert(d.param() == pa);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
index 72a66c7..f173d6b 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
@@ -35,7 +35,7 @@
         typedef std::piecewise_constant_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d1(b, b+Np+1, p);
         std::ostringstream os;
         os << d1;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
index fe0c23f..f0bca2a 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
@@ -24,7 +24,7 @@
         typedef std::piecewise_constant_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d(b, b+Np+1, p);
         assert(d.max() == 17);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
index 533f3e2..060c4ee 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
@@ -24,7 +24,7 @@
         typedef std::piecewise_constant_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d(b, b+Np+1, p);
         assert(d.min() == 10);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
index a97708d..a7074a8 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
@@ -26,7 +26,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P p0(b, b+Np+1, p);
         P p1;
         p1 = p0;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
index 80b442a..1d44416 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
@@ -26,7 +26,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P p0(b, b+Np+1, p);
         P p1 = p0;
         assert(p1 == p0);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
index ea8924e..e551c8c 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
@@ -47,11 +47,11 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {0, 1, 1, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -65,16 +65,16 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
@@ -99,11 +99,11 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {0, 0, 1, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -117,16 +117,16 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
@@ -151,11 +151,11 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {1, 0, 0, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
-    const size_t N = 1000000;
+    const std::size_t N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -169,16 +169,16 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
@@ -203,11 +203,11 @@
     G g;
     double b[] = {10, 14, 16};
     double p[] = {0, 1, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -221,16 +221,16 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
@@ -256,11 +256,11 @@
     G g;
     double b[] = {10, 14};
     double p[] = {1, 1};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -274,17 +274,17 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         assert(i < Np);
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
@@ -310,11 +310,11 @@
     G g;
     double b[] = {10, 14, 16, 17};
     double p[] = {25, 62.5, 12.5, 0};
-    const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+    const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
     D d(b, b+Np+1, p);
     const int N = 1000000;
     std::vector<D::result_type> u;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         D::result_type v = d(g);
         assert(d.min() <= v && v < d.max());
@@ -328,16 +328,16 @@
     double c = std::numeric_limits<double>::quiet_NaN();
     std::vector<double> areas(Np);
     double S = 0;
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
     {
         areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
         S += areas[i];
     }
-    for (size_t i = 0; i < areas.size(); ++i)
+    for (std::size_t i = 0; i < areas.size(); ++i)
         areas[i] /= S;
-    for (size_t i = 0; i < Np+1; ++i)
+    for (std::size_t i = 0; i < Np+1; ++i)
         p[i] /= S;
-    for (size_t i = 0; i < N; ++i)
+    for (std::size_t i = 0; i < N; ++i)
     {
         int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
         if (k != kp)
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
index 9c9365f..605b119 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
@@ -48,12 +48,12 @@
         G g;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 0};
-        const size_t Np = sizeof(p) / sizeof(p[0]) - 1;
+        const std::size_t Np = sizeof(p) / sizeof(p[0]) - 1;
         D d;
         P pa(b, b+Np+1, p);
-        const size_t N = 1000000;
+        const std::size_t N = 1000000;
         std::vector<D::result_type> u;
-        for (size_t i = 0; i < N; ++i)
+        for (std::size_t i = 0; i < N; ++i)
         {
             D::result_type v = d(g, pa);
             assert(10 <= v && v < 17);
@@ -67,16 +67,16 @@
         double c = std::numeric_limits<double>::quiet_NaN();
         std::vector<double> areas(Np);
         double S = 0;
-        for (size_t i = 0; i < areas.size(); ++i)
+        for (std::size_t i = 0; i < areas.size(); ++i)
         {
             areas[i] = (p[i]+p[i+1])*(b[i+1]-b[i])/2;
             S += areas[i];
         }
-        for (size_t i = 0; i < areas.size(); ++i)
+        for (std::size_t i = 0; i < areas.size(); ++i)
             areas[i] /= S;
-        for (size_t i = 0; i < Np+1; ++i)
+        for (std::size_t i = 0; i < Np+1; ++i)
             p[i] /= S;
-        for (size_t i = 0; i < N; ++i)
+        for (std::size_t i = 0; i < N; ++i)
         {
             int k = std::lower_bound(b, b+Np+1, u[i]) - b - 1;
             if (k != kp)
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
index b9450c0..5c36008 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
@@ -25,7 +25,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 10};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P pa(b, b+Np, p);
         D d(pa);
         assert(d.param() == pa);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
index e3983b9..8a0a8ff 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
@@ -35,7 +35,7 @@
         typedef std::piecewise_linear_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 25};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d1(b, b+Np, p);
         std::ostringstream os;
         os << d1;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
index e0c6857..b37ab29 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
@@ -24,7 +24,7 @@
         typedef std::piecewise_linear_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d(b, b+Np, p);
         assert(d.max() == 17);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
index a0ec322..51b555e 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
@@ -24,7 +24,7 @@
         typedef std::piecewise_linear_distribution<> D;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 0};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         D d(b, b+Np, p);
         assert(d.min() == 10);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
index 47b5c28..ff9e317 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
@@ -26,7 +26,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 2};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P p0(b, b+Np, p);
         P p1;
         p1 = p0;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
index b88d9c2..15a8466 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
@@ -26,7 +26,7 @@
         typedef D::param_type P;
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 5};
-        const size_t Np = sizeof(p) / sizeof(p[0]);
+        const std::size_t Np = sizeof(p) / sizeof(p[0]);
         P p0(b, b+Np, p);
         P p1 = p0;
         assert(p1 == p0);
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
index d636c4c..669f90d 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
@@ -15,12 +15,13 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
-#include <random>
 #include <cassert>
 #include <climits>
 #include <cstddef>
+#include <cstdint>
 #include <limits>
 #include <numeric>
+#include <random>
 #include <vector>
 
 #include "test_macros.h"
@@ -123,8 +124,8 @@
     test_statistics<short, std::minstd_rand0>(SHRT_MIN, SHRT_MAX);
 
 #if defined(_LIBCPP_VERSION) // extension
-    test_statistics<int8_t, std::minstd_rand0>();
-    test_statistics<uint8_t, std::minstd_rand0>();
+    test_statistics<std::int8_t, std::minstd_rand0>();
+    test_statistics<std::uint8_t, std::minstd_rand0>();
 
 #if !defined(TEST_HAS_NO_INT128) && !defined(TEST_BUGGY_I128_FP)
     test_statistics<__int128_t, std::minstd_rand0>();
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/int128.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/int128.pass.cpp
index 9b52205..9d499db 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/int128.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.dist/rand.dist.uni/rand.dist.uni.int/int128.pass.cpp
@@ -15,10 +15,11 @@
 
 // template<class _URNG> result_type operator()(_URNG& g);
 
-#include <random>
 
 #include <cassert>
+#include <cstdint>
 #include <limits>
+#include <random>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
index a814056..02df034 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
@@ -267,8 +267,8 @@
     test1();
     test2();
 
-    test_implicit<std::mt19937, uint_fast32_t>();
-    test_implicit<std::mt19937_64, uint_fast64_t>();
+    test_implicit<std::mt19937, std::uint_fast32_t>();
+    test_implicit<std::mt19937_64, std::uint_fast64_t>();
 
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
index 291dbf7..3c7ab48 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
@@ -76,8 +76,8 @@
     static_assert(test_convertible<std::ranlux48_base>(), "");
     test_implicit_ctor<std::ranlux24_base>();
     test_implicit_ctor<std::ranlux48_base>();
-    static_assert(!test_convertible<std::ranlux24_base, uint_fast32_t>(), "");
-    static_assert(!test_convertible<std::ranlux48_base, uint_fast64_t>(), "");
+    static_assert(!test_convertible<std::ranlux24_base, std::uint_fast32_t>(), "");
+    static_assert(!test_convertible<std::ranlux48_base, std::uint_fast64_t>(), "");
 #endif
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.req/rand.req.urng/uniform_random_bit_generator.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.req/rand.req.urng/uniform_random_bit_generator.compile.pass.cpp
index bfda9b7..9f2fe28 100644
--- a/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.req/rand.req.urng/uniform_random_bit_generator.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/numerics/rand/rand.req/rand.req.urng/uniform_random_bit_generator.compile.pass.cpp
@@ -140,5 +140,3 @@
   static constexpr unsigned char max() { return 1; }
 };
 static_assert(std::uniform_random_bit_generator<Works>);
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/iterator_robust_against_adl.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/iterator_robust_against_adl.compile.pass.cpp
new file mode 100644
index 0000000..09b77c0
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/ranges/iterator_robust_against_adl.compile.pass.cpp
@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
+
+// ADL call with nested iterators of views should not look up base's view's
+// namespace
+
+#include <ranges>
+#include <tuple>
+
+#include "test_macros.h"
+
+#ifndef TEST_HAS_NO_LOCALIZATION
+#include <istream>
+#endif
+namespace adl {
+
+struct BaseView : std::ranges::view_base {
+  int* begin() const;
+  int* end() const;
+};
+
+struct TupleView : std::ranges::view_base {
+  std::tuple<int>* begin() const;
+  std::tuple<int>* end() const;
+};
+
+struct NestedView : std::ranges::view_base {
+  BaseView* begin() const;
+  BaseView* end() const;
+};
+
+struct Pred {
+  bool operator()(const auto&...) const;
+};
+
+struct Sentinel {
+  bool operator==(const auto&) const;
+};
+
+struct Value {
+  friend std::istream& operator>>(std::istream&, Value);
+};
+
+void adl_func(const auto&);
+
+} // namespace adl
+
+template <class View>
+concept CanFindADLFunc = requires(std::ranges::iterator_t<View> it) { adl_func(it); };
+
+static_assert(!CanFindADLFunc<std::ranges::elements_view<adl::TupleView, 0>>);
+static_assert(!CanFindADLFunc<std::ranges::filter_view<adl::BaseView, adl::Pred>>);
+static_assert(!CanFindADLFunc<std::ranges::iota_view<int, adl::Sentinel>>);
+
+#ifndef TEST_HAS_NO_LOCALIZATION
+static_assert(!CanFindADLFunc<std::ranges::istream_view<adl::Value>>);
+#endif
+
+static_assert(!CanFindADLFunc<std::ranges::join_view<adl::NestedView>>);
+
+static_assert(!CanFindADLFunc<std::ranges::lazy_split_view<adl::BaseView, adl::BaseView>>);
+using InnerRange =
+    typename std::ranges::iterator_t<std::ranges::lazy_split_view<adl::BaseView, adl::BaseView>>::value_type;
+static_assert(!CanFindADLFunc<InnerRange >);
+
+static_assert(!CanFindADLFunc<std::ranges::split_view<adl::BaseView, adl::BaseView>>);
+static_assert(!CanFindADLFunc<std::ranges::transform_view<adl::BaseView, adl::Pred>>);
+
+#if TEST_STD_VER >= 23
+static_assert(!CanFindADLFunc<std::ranges::zip_view<adl::BaseView>>);
+#endif
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.access/empty.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.access/empty.pass.cpp
index 4ff1f3b..990b75b 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.access/empty.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.access/empty.pass.cpp
@@ -87,13 +87,13 @@
 }
 
 struct SizeMember {
-  size_t size_;
-  constexpr size_t size() const { return size_; }
+  std::size_t size_;
+  constexpr std::size_t size() const { return size_; }
 };
 
 struct SizeFunction {
-  size_t size_;
-  friend constexpr size_t size(SizeFunction sf) { return sf.size_; }
+  std::size_t size_;
+  friend constexpr std::size_t size(SizeFunction sf) { return sf.size_; }
 };
 
 struct BeginEndSizedSentinel {
@@ -131,7 +131,7 @@
 struct DisabledSizeRangeWithBeginEnd {
   constexpr int *begin() const { return nullptr; }
   constexpr auto end() const { return sentinel_wrapper<int*>(nullptr); }
-  size_t size() const;
+  std::size_t size() const;
 };
 template<>
 inline constexpr bool std::ranges::disable_sized_range<DisabledSizeRangeWithBeginEnd> = true;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.access/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.access/size.pass.cpp
index 0568173..fd7d0a8 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.access/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.access/size.pass.cpp
@@ -35,23 +35,23 @@
 static_assert(std::ranges::size(static_cast<const Incomplete(&&)[42]>(array_of_incomplete)) == 42);
 
 struct SizeMember {
-  constexpr size_t size() { return 42; }
+  constexpr std::size_t size() { return 42; }
 };
 
 struct StaticSizeMember {
-  constexpr static size_t size() { return 42; }
+  constexpr static std::size_t size() { return 42; }
 };
 
 static_assert(!std::is_invocable_v<RangeSizeT, const SizeMember>);
 
 struct SizeFunction {
-  friend constexpr size_t size(SizeFunction) { return 42; }
+  friend constexpr std::size_t size(SizeFunction) { return 42; }
 };
 
 // Make sure the size member is preferred.
 struct SizeMemberAndFunction {
-  constexpr size_t size() { return 42; }
-  friend constexpr size_t size(SizeMemberAndFunction) { return 0; }
+  constexpr std::size_t size() { return 42; }
+  friend constexpr std::size_t size(SizeMemberAndFunction) { return 0; }
 };
 
 bool constexpr testArrayType() {
@@ -61,19 +61,19 @@
   SizeFunction d[4];
 
   assert(std::ranges::size(a) == 4);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(a)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(a)), std::size_t);
   assert(std::ranges::size(b) == 1);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(b)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(b)), std::size_t);
   assert(std::ranges::size(c) == 4);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(c)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(c)), std::size_t);
   assert(std::ranges::size(d) == 4);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(d)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(d)), std::size_t);
 
   return true;
 }
 
 struct SizeMemberConst {
-  constexpr size_t size() const { return 42; }
+  constexpr std::size_t size() const { return 42; }
 };
 
 struct SizeMemberSigned {
@@ -82,7 +82,7 @@
 
 bool constexpr testHasSizeMember() {
   assert(std::ranges::size(SizeMember()) == 42);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(SizeMember())), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(SizeMember())), std::size_t);
 
   const SizeMemberConst sizeMemberConst;
   assert(std::ranges::size(sizeMemberConst) == 42);
@@ -93,7 +93,7 @@
   ASSERT_SAME_TYPE(decltype(std::ranges::size(SizeMemberSigned())), long);
 
   assert(std::ranges::size(StaticSizeMember()) == 42);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(StaticSizeMember())), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(StaticSizeMember())), std::size_t);
 
   return true;
 }
@@ -103,25 +103,25 @@
   MoveOnlySizeFunction(MoveOnlySizeFunction &&) = default;
   MoveOnlySizeFunction(MoveOnlySizeFunction const&) = delete;
 
-  friend constexpr size_t size(MoveOnlySizeFunction) { return 42; }
+  friend constexpr std::size_t size(MoveOnlySizeFunction) { return 42; }
 };
 
 enum EnumSizeFunction {
   a, b
 };
 
-constexpr size_t size(EnumSizeFunction) { return 42; }
+constexpr std::size_t size(EnumSizeFunction) { return 42; }
 
 struct SizeFunctionConst {
-  friend constexpr size_t size(const SizeFunctionConst) { return 42; }
+  friend constexpr std::size_t size(const SizeFunctionConst) { return 42; }
 };
 
 struct SizeFunctionRef {
-  friend constexpr size_t size(SizeFunctionRef&) { return 42; }
+  friend constexpr std::size_t size(SizeFunctionRef&) { return 42; }
 };
 
 struct SizeFunctionConstRef {
-  friend constexpr size_t size(SizeFunctionConstRef const&) { return 42; }
+  friend constexpr std::size_t size(SizeFunctionConstRef const&) { return 42; }
 };
 
 struct SizeFunctionSigned {
@@ -130,7 +130,7 @@
 
 bool constexpr testHasSizeFunction() {
   assert(std::ranges::size(SizeFunction()) == 42);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(SizeFunction())), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(SizeFunction())), std::size_t);
   static_assert(!std::is_invocable_v<RangeSizeT, MoveOnlySizeFunction>);
   assert(std::ranges::size(EnumSizeFunction()) == 42);
   assert(std::ranges::size(SizeFunctionConst()) == 42);
@@ -159,7 +159,7 @@
 };
 
 struct Convertible {
-  operator size_t();
+  operator std::size_t();
 };
 
 struct ConvertibleReturnTypeMember {
@@ -188,14 +188,14 @@
 static_assert(!std::is_invocable_v<RangeSizeT, BoolReturnTypeFunction const&>);
 
 struct SizeMemberDisabled {
-  size_t size() { return 42; }
+  std::size_t size() { return 42; }
 };
 
 template <>
 inline constexpr bool std::ranges::disable_sized_range<SizeMemberDisabled> = true;
 
 struct ImproperlyDisabledMember {
-  size_t size() const { return 42; }
+  std::size_t size() const { return 42; }
 };
 
 // Intentionally disabling "const ConstSizeMemberDisabled". This doesn't disable anything
@@ -204,14 +204,14 @@
 inline constexpr bool std::ranges::disable_sized_range<const ImproperlyDisabledMember> = true;
 
 struct SizeFunctionDisabled {
-  friend size_t size(SizeFunctionDisabled) { return 42; }
+  friend std::size_t size(SizeFunctionDisabled) { return 42; }
 };
 
 template <>
 inline constexpr bool std::ranges::disable_sized_range<SizeFunctionDisabled> = true;
 
 struct ImproperlyDisabledFunction {
-  friend size_t size(ImproperlyDisabledFunction const&) { return 42; }
+  friend std::size_t size(ImproperlyDisabledFunction const&) { return 42; }
 };
 
 template <>
@@ -224,7 +224,7 @@
 
 // No begin end.
 struct HasMinusOperator {
-  friend constexpr size_t operator-(HasMinusOperator, HasMinusOperator) { return 2; }
+  friend constexpr std::size_t operator-(HasMinusOperator, HasMinusOperator) { return 2; }
 };
 static_assert(!std::is_invocable_v<RangeSizeT, HasMinusOperator>);
 
@@ -277,7 +277,7 @@
   int buff[8];
   constexpr int* begin() { return buff; }
   constexpr int* end() { return buff + 8; }
-  constexpr size_t size() { return 1; }
+  constexpr std::size_t size() { return 1; }
 };
 
 template <>
@@ -287,14 +287,14 @@
   int buff[8];
   constexpr int* begin() { return buff; }
   constexpr int* end() { return buff + 8; }
-  constexpr size_t size() { return 1; }
+  constexpr std::size_t size() { return 1; }
 };
 
 constexpr bool testRanges() {
   HasMinusBeginEnd a;
   assert(std::ranges::size(a) == 2);
   // Ensure that this is converted to an *unsigned* type.
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(a)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(a)), std::size_t);
 
   IntPtrBeginAndEnd b;
   assert(std::ranges::size(b) == 8);
@@ -304,7 +304,7 @@
 
   RandomAccessRange d;
   assert(std::ranges::size(d) == 2);
-  ASSERT_SAME_TYPE(decltype(std::ranges::size(d)), size_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::size(d)), std::size_t);
 
   SizeBeginAndEndMembers e;
   assert(std::ranges::size(e) == 1);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.access/ssize.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.access/ssize.pass.cpp
index be35fe2..ac2c5b7 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.access/ssize.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.access/ssize.pass.cpp
@@ -24,12 +24,12 @@
 static_assert( std::is_invocable_v<RangeSSizeT, int (&)[1]>);
 
 struct SizeMember {
-  constexpr size_t size() { return 42; }
+  constexpr std::size_t size() { return 42; }
 };
 static_assert(!std::is_invocable_v<decltype(std::ranges::ssize), const SizeMember&>);
 
 struct SizeFunction {
-  friend constexpr size_t size(SizeFunction) { return 42; }
+  friend constexpr std::size_t size(SizeFunction) { return 42; }
 };
 
 struct SizeFunctionSigned {
@@ -47,7 +47,7 @@
 };
 
 // size_t changes depending on the platform.
-using SignedSizeT = std::make_signed_t<size_t>;
+using SignedSizeT = std::make_signed_t<std::size_t>;
 
 constexpr bool test() {
   int a[4];
@@ -71,7 +71,7 @@
   // This gets converted to ptrdiff_t because it's wider.
   ShortUnsignedReturnType c;
   assert(std::ranges::ssize(c) == 42);
-  ASSERT_SAME_TYPE(decltype(std::ranges::ssize(c)), ptrdiff_t);
+  ASSERT_SAME_TYPE(decltype(std::ranges::ssize(c)), std::ptrdiff_t);
 
   return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/begin.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/begin.pass.cpp
index 684cdd8..db846b2 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/begin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/begin.pass.cpp
@@ -84,14 +84,14 @@
 };
 
 constexpr bool test() {
-  meta::for_each(meta::cpp20_input_iterator_list<int*>{}, []<class Iter> {
+  types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter> {
     if constexpr (std::sentinel_for<Iter, Iter>)
       test_range<Iter, Iter>();
     test_range<Iter, sentinel_wrapper<Iter>>();
     test_range<Iter, sized_sentinel<Iter>>();
   });
 
-  meta::for_each(meta::forward_iterator_list<const int*>{}, []<class Iter> {
+  types::for_each(types::forward_iterator_list<const int*>{}, []<class Iter> {
     test_const_range<Iter, Iter>();
     test_const_range<Iter, sentinel_wrapper<Iter>>();
     test_const_range<Iter, sized_sentinel<Iter>>();
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/ctor.pass.cpp
index 4832139..d9b14e4 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/ctor.pass.cpp
@@ -12,6 +12,7 @@
 
 #include <cassert>
 #include <ranges>
+#include <type_traits>
 #include <vector>
 
 struct DefaultConstructibleView : std::ranges::view_base {
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/end.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/end.pass.cpp
index eb79e14..529a609 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/end.pass.cpp
@@ -118,7 +118,7 @@
   test_range<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>, false>();
   test_range<cpp20_input_iterator<int*>, sized_sentinel<cpp20_input_iterator<int*>>, false>();
 
-  meta::for_each(meta::forward_iterator_list<int*>{}, []<class Iter> {
+  types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
     test_range<Iter, Iter, true>();
     test_range<Iter, sentinel_wrapper<Iter>, false>();
     test_range<Iter, sized_sentinel<Iter>, false>();
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/size.pass.cpp
index f330b41..3de1a93 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.as.rvalue/size.pass.cpp
@@ -20,7 +20,7 @@
   int* begin() const;
   int* end() const;
 
-  constexpr size_t size() const {
+  constexpr std::size_t size() const {
     *size_called = true;
     return 3;
   }
@@ -56,7 +56,7 @@
   {
     bool size_called = false;
     std::ranges::as_rvalue_view view(ConstSizedView{{}, &size_called});
-    std::same_as<size_t> auto size = view.size();
+    std::same_as<std::size_t> auto size = view.size();
     assert(size == 3);
     assert(size_called);
   }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.counted/counted.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.counted/counted.pass.cpp
index 71014f1..e55121f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.counted/counted.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.counted/counted.pass.cpp
@@ -46,7 +46,7 @@
   {
     static_assert(std::addressof(std::views::counted) == std::addressof(std::ranges::views::counted));
 
-    static_assert( CountedInvocable<int*, size_t>);
+    static_assert( CountedInvocable<int*, std::size_t>);
     static_assert(!CountedInvocable<int*, LvalueConvertible>);
     static_assert( CountedInvocable<int*, LvalueConvertible&>);
     static_assert( CountedInvocable<int*, RvalueConvertible>);
@@ -54,7 +54,7 @@
     static_assert(!CountedInvocable<int*, OnlyExplicitlyConvertible>);
     static_assert(!CountedInvocable<int*, int*>);
     static_assert(!CountedInvocable<int*>);
-    static_assert(!CountedInvocable<size_t>);
+    static_assert(!CountedInvocable<std::size_t>);
     static_assert(!CountedInvocable<>);
   }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop.while/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop.while/ctor.view.pass.cpp
index cf9f9db..326cabd 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop.while/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop.while/ctor.view.pass.cpp
@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr drop_while_view(V base, Pred pred);
+// constexpr drop_while_view(V base, Pred pred); // explicit since C++23
 
 #include <cassert>
 #include <ranges>
@@ -16,6 +16,8 @@
 #include <utility>
 
 #include "MoveOnly.h"
+#include "test_convertible.h"
+#include "test_macros.h"
 
 struct View : std::ranges::view_base {
   MoveOnly mo;
@@ -32,9 +34,23 @@
   bool operator()(int) const;
 };
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::drop_while_view<View, Pred>, View, Pred>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::drop_while_view<View, Pred>, View, Pred>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
-    std::ranges::drop_while_view<View, Pred> dwv = {View{{}, MoveOnly{5}}, Pred{}};
+    std::ranges::drop_while_view<View, Pred> dwv{View{{}, MoveOnly{5}}, Pred{}};
     assert(dwv.pred().moved);
     assert(!dwv.pred().copied);
     assert(std::move(dwv).base().mo.get() == 5);
@@ -45,5 +61,6 @@
 int main(int, char**) {
   test();
   static_assert(test());
+
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/adaptor.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/adaptor.pass.cpp
index 6dd90c5..542f2cd 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/adaptor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/adaptor.pass.cpp
@@ -47,7 +47,7 @@
 
   constexpr auto begin() const { return iterator(begin_); }
   constexpr auto end() const { return sentinel(iterator(end_)); }
-  constexpr size_t size() const { return end_ - begin_; }
+  constexpr std::size_t size() const { return end_ - begin_; }
 };
 static_assert(std::ranges::random_access_range<SizedViewWithUnsizedSentinel>);
 static_assert(std::ranges::sized_range<SizedViewWithUnsizedSentinel>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/begin.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/begin.pass.cpp
index 5d08c70..cff0884 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/begin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/begin.pass.cpp
@@ -37,7 +37,7 @@
     return nullptr;
   }
   constexpr int* end() const { return nullptr; }
-  constexpr size_t size() const { return 0; }
+  constexpr std::size_t size() const { return 0; }
 };
 
 using SimpleView = MaybeSimpleView<true>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/ctor.view.pass.cpp
index 504021a..4f4257f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/ctor.view.pass.cpp
@@ -8,13 +8,28 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr drop_view(V base, range_difference_t<V> count);
+// constexpr drop_view(V base, range_difference_t<V> count);  // explicit since C++23
 
 #include <ranges>
 
+#include "test_convertible.h"
 #include "test_macros.h"
 #include "types.h"
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::drop_view<View>, View, std::ranges::range_difference_t<View>>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert(test_convertible<std::ranges::drop_view<View>, View, std::ranges::range_difference_t<View>>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   std::ranges::drop_view dropView1(MoveOnlyView(), 4);
   assert(dropView1.size() == 4);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/types.h
index b32c534..32bbddc 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.drop/types.h
@@ -94,4 +94,15 @@
   constexpr CountedIter end() const { return CountedIter(ForwardIter(globalBuff + 8)); }
 };
 
+struct View : std::ranges::view_base {
+  constexpr explicit View(int* b, int* e) : begin_(b), end_(e) { }
+
+  constexpr int* begin() const { return begin_; }
+  constexpr int* end() const { return end_; }
+
+private:
+  int* begin_;
+  int* end_;
+};
+
 #endif // TEST_STD_RANGES_RANGE_ADAPTORS_RANGE_DROP_TYPES_H
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.default.pass.cpp
index 62aa9b2..11da484 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.default.pass.cpp
@@ -29,7 +29,7 @@
   sentinel_wrapper<cpp20_input_iterator<std::tuple<int>*>> end() const;
 };
 
-template <class View, size_t N>
+template <class View, std::size_t N>
 using ElementsIter = std::ranges::iterator_t<std::ranges::elements_view<View, N>>;
 
 static_assert(!std::default_initializable<ElementsIter<IterNoDefaultCtrView, 0>>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.other.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.other.pass.cpp
index 6756474..4c94cd5 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.other.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/ctor.other.pass.cpp
@@ -21,7 +21,7 @@
 struct ConvertibleIter : IterBase<ConvertibleIter<Const>> {
   using iterator_category = std::random_access_iterator_tag;
   using value_type        = std::tuple<int>;
-  using difference_type   = intptr_t;
+  using difference_type   = std::intptr_t;
 
   bool movedFromOtherConst = false;
   int i                    = 0;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/member_types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/member_types.compile.pass.cpp
index 67ec179..9a76c2f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/member_types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/iterator/member_types.compile.pass.cpp
@@ -20,7 +20,7 @@
 template <class Iter>
 using Range = std::ranges::subrange<Iter, sentinel_wrapper<Iter>>;
 
-template <class Range, size_t N = 0>
+template <class Range, std::size_t N = 0>
 using ElementsIter = std::ranges::iterator_t<std::ranges::elements_view<Range, N>>;
 
 // using iterator_concept = see below;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/range.concept.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/range.concept.compile.pass.cpp
index 021f028..7de72ec 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/range.concept.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/range.concept.compile.pass.cpp
@@ -35,7 +35,7 @@
 template <class It>
 using Range = std::ranges::subrange<It, sentinel_wrapper<It>>;
 
-template <class V, size_t N>
+template <class V, std::size_t N>
 concept HasElementsView = requires { typename std::ranges::elements_view<V, N>; };
 
 static_assert(HasElementsView<Range<std::ranges::subrange<int*>*>, 0>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/equality.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/equality.pass.cpp
index 55477cc..df95e07 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/equality.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/equality.pass.cpp
@@ -23,7 +23,7 @@
   std::tuple<int>* it_;
 
   using value_type       = std::tuple<int>;
-  using difference_type  = intptr_t;
+  using difference_type  = std::intptr_t;
   using iterator_concept = std::input_iterator_tag;
 
   constexpr decltype(auto) operator*() const { return *it_; }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp
index 9af7b09..343bf80 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp
@@ -20,6 +20,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <cstddef>
 #include <functional>
 #include <ranges>
 #include <tuple>
@@ -31,7 +32,7 @@
   std::tuple<int>* it_;
 
   using value_type       = std::tuple<int>;
-  using difference_type  = intptr_t;
+  using difference_type  = std::ptrdiff_t;
   using iterator_concept = std::input_iterator_tag;
 
   constexpr decltype(auto) operator*() const { return *it_; }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/types.h
index a1c0884..f1ee165 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.elements/types.h
@@ -93,7 +93,7 @@
 struct IterBase {
   using iterator_concept = std::random_access_iterator_tag;
   using value_type       = std::tuple<int>;
-  using difference_type  = intptr_t;
+  using difference_type  = std::intptr_t;
 
   constexpr std::tuple<int> operator*() const { return std::tuple<int>(5); }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/ctor.view_pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/ctor.view_pred.pass.cpp
index 644f8de..3ccab93 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/ctor.view_pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/ctor.view_pred.pass.cpp
@@ -8,12 +8,14 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr filter_view(View, Pred);
-
-#include <ranges>
+// constexpr filter_view(View, Pred); // explicit since C++23
 
 #include <cassert>
+#include <ranges>
 #include <utility>
+
+#include "test_convertible.h"
+#include "test_macros.h"
 #include "types.h"
 
 struct Range : std::ranges::view_base {
@@ -41,6 +43,20 @@
   int* end() const;
 };
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::filter_view<Range, Pred>, Range, Pred>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::filter_view<Range, Pred>, Range, Pred>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   int buff[] = {1, 2, 3, 4, 5, 6, 7, 8};
 
@@ -57,19 +73,6 @@
     assert(it == end);
   }
 
-  // Test implicit syntax
-  {
-    Range range(buff, buff + 8);
-    Pred pred;
-    std::ranges::filter_view<Range, Pred> view = {range, pred};
-    auto it = view.begin(), end = view.end();
-    assert(*it++ == 1);
-    assert(*it++ == 3);
-    assert(*it++ == 5);
-    assert(*it++ == 7);
-    assert(it == end);
-  }
-
   // Make sure we move the view
   {
     bool moved = false, copied = false;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/iterator/arrow.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/iterator/arrow.pass.cpp
index 500d875..71d16e4 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/iterator/arrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.filter/iterator/arrow.pass.cpp
@@ -6,6 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+// This test is hitting Clang bugs with LSV in older versions of Clang.
+// UNSUPPORTED: modules-build && (clang-15 || apple-clang-14)
+
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
 // constexpr iterator_t<V> operator->() const
@@ -22,7 +25,7 @@
 #include "test_macros.h"
 #include "../types.h"
 
-struct Point {
+struct XYPoint {
   int x;
   int y;
 };
@@ -31,21 +34,21 @@
 concept has_arrow = requires (T t) {
   { t->x };
 };
-static_assert(has_arrow<Point*>); // test the test
+static_assert(has_arrow<XYPoint*>); // test the test
 
 struct WithArrowOperator {
   using iterator_category = std::input_iterator_tag;
   using difference_type = std::ptrdiff_t;
-  using value_type = Point;
+  using value_type = XYPoint;
 
-  constexpr explicit WithArrowOperator(Point* p) : p_(p) { }
-  constexpr Point& operator*() const { return *p_; }
-  constexpr Point* operator->() const { return p_; } // has arrow
+  constexpr explicit WithArrowOperator(XYPoint* p) : p_(p) { }
+  constexpr XYPoint& operator*() const { return *p_; }
+  constexpr XYPoint* operator->() const { return p_; } // has arrow
   constexpr WithArrowOperator& operator++() { ++p_; return *this; }
   constexpr WithArrowOperator operator++(int) { return WithArrowOperator(p_++); }
 
-  friend constexpr Point* base(WithArrowOperator const& i) { return i.p_; }
-  Point* p_;
+  friend constexpr XYPoint* base(WithArrowOperator const& i) { return i.p_; }
+  XYPoint* p_;
 };
 static_assert(std::input_iterator<WithArrowOperator>);
 
@@ -53,29 +56,29 @@
   struct iterator {
     using iterator_category = std::input_iterator_tag;
     using difference_type = std::ptrdiff_t;
-    using value_type = Point;
+    using value_type = XYPoint;
 
     iterator(iterator const&) = delete; // not copyable
     iterator(iterator&&);
     iterator& operator=(iterator&&);
-    Point& operator*() const;
+    XYPoint& operator*() const;
     iterator operator->() const;
     iterator& operator++();
     iterator operator++(int);
 
-    // We need this to use Point* as a sentinel type below. sentinel_wrapper
+    // We need this to use XYPoint* as a sentinel type below. sentinel_wrapper
     // can't be used because this iterator is not copyable.
-    friend bool operator==(iterator const&, Point*);
+    friend bool operator==(iterator const&, XYPoint*);
   };
 
   iterator begin() const;
-  Point* end() const;
+  XYPoint* end() const;
 };
 static_assert(std::ranges::input_range<WithNonCopyableIterator>);
 
 template <class Iterator, class Sentinel = sentinel_wrapper<Iterator>>
 constexpr void test() {
-  std::array<Point, 5> array{{{0, 0}, {1, 1}, {2, 2}, {3, 3}, {4, 4}}};
+  std::array<XYPoint, 5> array{{{0, 0}, {1, 1}, {2, 2}, {3, 3}, {4, 4}}};
   using View = minimal_view<Iterator, Sentinel>;
   using FilterView = std::ranges::filter_view<View, AlwaysTrue>;
   using FilterIterator = std::ranges::iterator_t<FilterView>;
@@ -97,10 +100,10 @@
 
 constexpr bool tests() {
   test<WithArrowOperator>();
-  test<Point*>();
-  test<Point const*>();
-  test<contiguous_iterator<Point*>>();
-  test<contiguous_iterator<Point const*>>();
+  test<XYPoint*>();
+  test<XYPoint const*>();
+  test<contiguous_iterator<XYPoint*>>();
+  test<contiguous_iterator<XYPoint const*>>();
 
   // Make sure filter_view::iterator doesn't have operator-> if the
   // underlying iterator doesn't have one.
@@ -111,11 +114,11 @@
       using FilterIterator = std::ranges::iterator_t<FilterView>;
       static_assert(!has_arrow<FilterIterator>);
     };
-    check_no_arrow.operator()<cpp17_input_iterator<Point*>>();
-    check_no_arrow.operator()<cpp20_input_iterator<Point*>>();
-    check_no_arrow.operator()<forward_iterator<Point*>>();
-    check_no_arrow.operator()<bidirectional_iterator<Point*>>();
-    check_no_arrow.operator()<random_access_iterator<Point*>>();
+    check_no_arrow.operator()<cpp17_input_iterator<XYPoint*>>();
+    check_no_arrow.operator()<cpp20_input_iterator<XYPoint*>>();
+    check_no_arrow.operator()<forward_iterator<XYPoint*>>();
+    check_no_arrow.operator()<bidirectional_iterator<XYPoint*>>();
+    check_no_arrow.operator()<random_access_iterator<XYPoint*>>();
     check_no_arrow.operator()<int*>();
   }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/adaptor.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/adaptor.pass.cpp
index 9beb3d2..afaf322 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/adaptor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/adaptor.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // std::views::join
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/base.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/base.pass.cpp
index caf018b..13883e8 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/base.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/base.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr V base() const& requires copy_constructible<V>;
 // constexpr V base() &&;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/begin.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/begin.pass.cpp
index 332973d..9e4fa5f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/begin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/begin.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr auto begin();
 // constexpr auto begin() const
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.compile.pass.cpp
index a8eafc5..2c47099 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.compile.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // template<class R>
 //   explicit join_view(R&&) -> join_view<views::all_t<R>>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.verify.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.verify.cpp
index 2c6eea5..eddc950 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctad.verify.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // template<class R>
 //   explicit join_view(R&&) -> join_view<views::all_t<R>>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.default.pass.cpp
index 0daff7d..26206e3 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.default.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // join_view() requires default_initializable<V> = default;
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.view.pass.cpp
index 75d4c7e..ce53930 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/ctor.view.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr explicit join_view(V base);
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/end.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/end.pass.cpp
index 5e49618..7e22520 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/end.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr auto end();
 // constexpr auto end() const;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/general.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/general.pass.cpp
index f92eb41..e9eab58 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/general.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/general.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // General tests for join_view. This file does not test anything specifically.
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/arrow.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/arrow.pass.cpp
index ddcf66b..e610cde 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/arrow.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/arrow.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr InnerIter operator->() const
 //   requires has-arrow<InnerIter> && copyable<InnerIter>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.default.pass.cpp
index 2f9bbb2..e4f193e 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.default.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // iterator() requires default_initializable<OuterIter> = default;
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.other.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.other.pass.cpp
index 76abcd4..a0406f9 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.other.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.other.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr iterator(iterator<!Const> i)
 //             requires Const &&
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.parent.outer.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.parent.outer.pass.cpp
index 7cca16a..215318f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.parent.outer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/ctor.parent.outer.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr iterator(Parent& parent, OuterIter outer);
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/decrement.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/decrement.pass.cpp
index eb2c34c..4363fb0 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/decrement.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/decrement.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr iterator& operator--();
 //              requires ref-is-glvalue && bidirectional_range<Base> &&
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/eq.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/eq.pass.cpp
index 4885f16..327cc82 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/eq.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/eq.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // friend constexpr bool operator==(const iterator& x, const iterator& y);
 //          requires ref-is-glvalue && equality_comparable<iterator_t<Base>> &&
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/increment.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/increment.pass.cpp
index f46edd3..4bcb4de 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/increment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/increment.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr iterator& operator++();
 // constexpr void operator++(int);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.move.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.move.pass.cpp
index 917e72d..0bf6aa3 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.move.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // friend constexpr decltype(auto) iter_move(const iterator& i);
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.swap.pass.cpp
index 28e1bf7..e9b73f1 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/iter.swap.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // friend constexpr void iter_swap(const iterator& x, const iterator& y);
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/member_types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/member_types.compile.pass.cpp
index b9b9d73..17b98fa 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/member_types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/member_types.compile.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // Iterator traits and member typedefs in join_view::<iterator>.
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/star.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/star.pass.cpp
index 73457b8..fa6f7bb 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/star.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/iterator/star.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr decltype(auto) operator*() const;
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.default.pass.cpp
index 42fcc73..0eebe14 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.default.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // sentinel() = default;
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.other.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.other.pass.cpp
index 4bd8025..c2d7058 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.other.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.other.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr sentinel(sentinel<!Const> s);
 //             requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.parent.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.parent.pass.cpp
index 1ac6827..a9df7c3 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.parent.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/ctor.parent.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // constexpr explicit sentinel(Parent& parent);
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/eq.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/eq.pass.cpp
index 7852d1b..cbd03b8 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/eq.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.join.view/sentinel/eq.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: !c++experimental
 
 // template<bool OtherConst>
 //   requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/base.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/base.pass.cpp
index b9f2ac2..c08e996 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/base.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/base.pass.cpp
@@ -25,8 +25,8 @@
   constexpr MoveOnlyView(std::string_view v) : view_(v) {}
   constexpr MoveOnlyView(MoveOnlyView&&) = default;
   constexpr MoveOnlyView& operator=(MoveOnlyView&&) = default;
-  constexpr const char* begin() const { return view_.begin(); }
-  constexpr const char* end() const { return view_.end(); }
+  constexpr std::string_view::const_iterator begin() const { return view_.begin(); }
+  constexpr std::string_view::const_iterator end() const { return view_.end(); }
   constexpr bool operator==(MoveOnlyView rhs) const { return view_ == rhs.view_; }
 };
 static_assert( std::ranges::view<MoveOnlyView>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/constraints.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/constraints.compile.pass.cpp
index bf9dd99..a942f43 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/constraints.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/constraints.compile.pass.cpp
@@ -66,7 +66,7 @@
 
   struct AlmostInputIterator {
     using value_type = char;
-    using difference_type = ptrdiff_t;
+    using difference_type = std::ptrdiff_t;
     using iterator_concept = int;
 
     constexpr const char& operator*() const;
@@ -169,7 +169,7 @@
   struct AlmostTinyRange : std::ranges::view_base {
     int* begin() const;
     int* end() const;
-    static size_t size() { return 1; }
+    static std::size_t size() { return 1; }
   };
 
   using View = InputView;
@@ -192,7 +192,7 @@
   struct AlmostTinyRange : std::ranges::view_base {
     int* begin() const;
     int* end() const;
-    constexpr static size_t size() { return 2; }
+    constexpr static std::size_t size() { return 2; }
   };
 
   using View = InputView;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.range.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.range.pass.cpp
index a822175..91df304 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.range.pass.cpp
@@ -11,7 +11,7 @@
 // template <input_range Range>
 //   requires constructible_from<View, views::all_t<Range>> &&
 //             constructible_from<Pattern, single_view<range_value_t<Range>>>
-// constexpr lazy_split_view(Range&& r, range_value_t<Range> e);
+// constexpr lazy_split_view(Range&& r, range_value_t<Range> e); // explicit since C++23
 
 #include <ranges>
 
@@ -20,6 +20,8 @@
 #include <string_view>
 #include <type_traits>
 #include <utility>
+
+#include "test_convertible.h"
 #include "types.h"
 
 struct ElementWithCounting {
@@ -80,14 +82,30 @@
   // C++23 and later.
   template <std::ranges::range R>
   constexpr StrView(R&& r) : buffer_(r.begin(), r.end()) {}
-  constexpr const char* begin() const { return buffer_.begin(); }
-  constexpr const char* end() const { return buffer_.end(); }
+  constexpr std::string_view::const_iterator begin() const { return buffer_.begin(); }
+  constexpr std::string_view::const_iterator end() const { return buffer_.end(); }
   constexpr bool operator==(const StrView& rhs) const { return buffer_ == rhs.buffer_; }
 };
 static_assert( std::ranges::random_access_range<StrView>);
 static_assert( std::ranges::view<StrView>);
 static_assert( std::is_copy_constructible_v<StrView>);
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(
+    !test_convertible<std::ranges::lazy_split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
+    "This constructor must be explicit");
+
+#else
+
+static_assert(
+    test_convertible<std::ranges::lazy_split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
+    "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
     using V = std::ranges::lazy_split_view<StrView, StrView>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.view.pass.cpp
index 264e883..e7bf052 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.view.pass.cpp
@@ -8,13 +8,14 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr lazy_split_view(View base, Pattern pattern);
-
-#include <ranges>
+// constexpr lazy_split_view(View base, Pattern pattern); // explicit since C++23
 
 #include <cassert>
+#include <ranges>
 #include <string_view>
 #include <utility>
+
+#include "test_convertible.h"
 #include "types.h"
 
 struct ViewWithCounting : std::ranges::view_base {
@@ -41,9 +42,27 @@
   constexpr ViewWithCounting& operator=(ViewWithCounting&&) = default;
   constexpr bool operator==(const ViewWithCounting&) const { return true; }
 };
+
 static_assert(std::ranges::forward_range<ViewWithCounting>);
 static_assert(std::ranges::view<ViewWithCounting>);
 
+using View = ViewWithCounting;
+using Pattern = ViewWithCounting;
+
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::lazy_split_view<View, Pattern>, View, Pattern>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::lazy_split_view<View, Pattern>, View, Pattern>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   // Calling the constructor with `(ForwardView, ForwardView)`.
   {
@@ -62,9 +81,6 @@
 
   // Make sure the arguments are moved, not copied.
   {
-    using View = ViewWithCounting;
-    using Pattern = ViewWithCounting;
-
     // Arguments are lvalues.
     {
       int view_copied = 0, view_moved = 0, pattern_copied = 0, pattern_moved = 0;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/end.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/end.pass.cpp
index 690ac7c..0f5ab62 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/end.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/end.pass.cpp
@@ -29,8 +29,8 @@
   constexpr ForwardViewCommonIfConst& operator=(const ForwardViewCommonIfConst&) = default;
   constexpr forward_iterator<char*> begin() { return forward_iterator<char*>(nullptr); }
   constexpr std::default_sentinel_t end()  { return std::default_sentinel; }
-  constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(view_.begin()); }
-  constexpr forward_iterator<const char*> end() const { return forward_iterator<const char*>(view_.end()); }
+  constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); }
+  constexpr forward_iterator<std::string_view::const_iterator> end() const { return forward_iterator<std::string_view::const_iterator>(view_.end()); }
 };
 bool operator==(forward_iterator<char*>, std::default_sentinel_t) { return false; }
 
@@ -45,10 +45,10 @@
   constexpr ForwardViewNonCommonRange& operator=(const ForwardViewNonCommonRange&) = default;
   constexpr forward_iterator<char*> begin() { return forward_iterator<char*>(nullptr); }
   constexpr std::default_sentinel_t end()  { return std::default_sentinel; }
-  constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(view_.begin()); }
+  constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); }
   constexpr std::default_sentinel_t end() const { return std::default_sentinel; }
 };
-bool operator==(forward_iterator<const char*>, std::default_sentinel_t) { return false; }
+bool operator==(forward_iterator<std::string_view::const_iterator>, std::default_sentinel_t) { return false; }
 
 constexpr bool test() {
   // non-const: forward_range<V> && simple_view<V> && simple_view<P> -> outer-iterator<Const = true>
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
index 4214532..f4e87bb 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
@@ -75,13 +75,13 @@
   return actual_it == view.end() && expected_it == expected.end();
 }
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr bool test_function_call(T&& input, Separator&& separator, std::array<U, M> expected) {
   std::ranges::lazy_split_view v(input, separator);
   return is_equal(v, expected);
 }
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr bool test_with_piping(T&& input, Separator&& separator, std::array<U, M> expected) {
   auto expected_it = expected.begin();
   for (auto e : input | std::ranges::views::lazy_split(separator)) {
@@ -166,7 +166,7 @@
   return std::string_view(str);
 };
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr void test_one(T&& input, Separator&& separator, std::array<U, M> expected) {
   assert(test_function_call(input, separator, expected));
   assert(test_with_piping(input, separator, expected));
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/increment.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/increment.pass.cpp
index e4d9eba..45257f2 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/increment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/increment.pass.cpp
@@ -22,7 +22,7 @@
 struct EmptyView : std::ranges::view_base {
   constexpr int* begin() const { return nullptr; }
   constexpr int* end() const { return nullptr; }
-  constexpr static size_t size() { return 0; }
+  constexpr static std::size_t size() { return 0; }
 };
 static_assert(std::ranges::forward_range<EmptyView>);
 static_assert(std::ranges::view<EmptyView>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_move.pass.cpp
index 3e56719..f9d2b3e 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_move.pass.cpp
@@ -23,7 +23,7 @@
 template <bool IsNoexcept = false>
 struct MaybeNoexceptIterator {
   using value_type = int;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
 
   value_type* ptr_ = nullptr;
   int* iter_move_invocations_ = nullptr;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_swap.pass.cpp
index 7d0e8a7..18fd3a3 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/range.lazy.split.inner/iter_swap.pass.cpp
@@ -24,7 +24,7 @@
 template <bool IsNoexcept = false>
 struct MaybeNoexceptIterator {
   using value_type = int;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
 
   value_type* ptr_ = nullptr;
   int* iter_swap_invocations_ = nullptr;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/types.h
index a606e91..f2878e8 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/types.h
@@ -10,6 +10,7 @@
 #define TEST_STD_RANGES_RANGE_ADAPTORS_RANGE_LAZY_SPLIT_TYPES_H
 
 #include <concepts>
+#include <cstddef>
 #include <ranges>
 #include <string>
 #include <string_view>
@@ -24,8 +25,8 @@
   constexpr explicit CopyableView() = default;
   constexpr CopyableView(const char* ptr) : view_(ptr) {}
   constexpr CopyableView(std::string_view v) : view_(v) {}
-  constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(view_.begin()); }
-  constexpr forward_iterator<const char*> end() const { return forward_iterator<const char*>(view_.end()); }
+  constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); }
+  constexpr forward_iterator<std::string_view::const_iterator> end() const { return forward_iterator<std::string_view::const_iterator>(view_.end()); }
   constexpr bool operator==(const CopyableView& rhs) const { return view_ == rhs.view_; }
 };
 static_assert( std::ranges::forward_range<CopyableView>);
@@ -42,8 +43,8 @@
   constexpr ForwardView(std::string_view v) : view_(v) {}
   constexpr ForwardView(ForwardView&&) = default;
   constexpr ForwardView& operator=(ForwardView&&) = default;
-  constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(view_.begin()); }
-  constexpr forward_iterator<const char*> end() const { return forward_iterator<const char*>(view_.end()); }
+  constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); }
+  constexpr forward_iterator<std::string_view::const_iterator> end() const { return forward_iterator<std::string_view::const_iterator>(view_.end()); }
 };
 static_assert( std::ranges::forward_range<ForwardView>);
 static_assert( std::ranges::forward_range<const ForwardView>);
@@ -122,13 +123,13 @@
   constexpr ForwardOnlyIfNonConstView(ForwardOnlyIfNonConstView&&) = default;
   constexpr ForwardOnlyIfNonConstView& operator=(ForwardOnlyIfNonConstView&&) = default;
 
-  constexpr forward_iterator<const char*> begin() { return forward_iterator<const char*>(view_.begin()); }
-  constexpr forward_iterator<const char*> end() { return forward_iterator<const char*>(view_.end()); }
-  constexpr almost_forward_iterator<const char*> begin() const {
-    return almost_forward_iterator<const char*>(view_.begin());
+  constexpr forward_iterator<std::string_view::const_iterator> begin() { return forward_iterator<std::string_view::const_iterator>(view_.begin()); }
+  constexpr forward_iterator<std::string_view::const_iterator> end() { return forward_iterator<std::string_view::const_iterator>(view_.end()); }
+  constexpr almost_forward_iterator<std::string_view::const_iterator> begin() const {
+    return almost_forward_iterator<std::string_view::const_iterator>(view_.begin());
   }
-  constexpr almost_forward_iterator<const char*> end() const {
-    return almost_forward_iterator<const char*>(view_.end());
+  constexpr almost_forward_iterator<std::string_view::const_iterator> end() const {
+    return almost_forward_iterator<std::string_view::const_iterator>(view_.end());
   }
 };
 static_assert( std::ranges::forward_range<ForwardOnlyIfNonConstView>);
@@ -174,7 +175,7 @@
   constexpr ForwardTinyView(char c) { *c_ = c; }
   constexpr forward_iterator<const char*> begin() const { return forward_iterator<const char*>(c_); }
   constexpr forward_iterator<const char*> end() const { return forward_iterator<const char*>(c_ + 1); }
-  constexpr static size_t size() { return 1; }
+  constexpr static std::size_t size() { return 1; }
 };
 static_assert(std::ranges::forward_range<ForwardTinyView>);
 static_assert(std::ranges::view<ForwardTinyView>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.reverse/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.reverse/size.pass.cpp
index d74b048..3d74bd2 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.reverse/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.reverse/size.pass.cpp
@@ -23,9 +23,9 @@
 template<CopyCategory CC>
 struct BidirSizedRange : std::ranges::view_base {
   int *ptr_;
-  size_t size_;
+  std::size_t size_;
 
-  constexpr BidirSizedRange(int *ptr, size_t size) : ptr_(ptr), size_(size) {}
+  constexpr BidirSizedRange(int *ptr, std::size_t size) : ptr_(ptr), size_(size) {}
   constexpr BidirSizedRange(const BidirSizedRange &) requires (CC == Copyable) = default;
   constexpr BidirSizedRange(BidirSizedRange &&) requires (CC == MoveOnly) = default;
   constexpr BidirSizedRange& operator=(const BidirSizedRange &) requires (CC == Copyable) = default;
@@ -36,7 +36,7 @@
   constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; }
   constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; }
 
-  constexpr size_t size() const { return size_; }
+  constexpr std::size_t size() const { return size_; }
 };
 
 constexpr bool test() {
@@ -49,8 +49,8 @@
     assert(rev.size() == 4);
     assert(std::move(rev).size() == 4);
 
-    ASSERT_SAME_TYPE(decltype(rev.size()), size_t);
-    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
+    ASSERT_SAME_TYPE(decltype(rev.size()), std::size_t);
+    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);
   }
   // Non-common, const bidirectional range.
   {
@@ -59,15 +59,15 @@
     assert(rev.size() == 4);
     assert(std::move(rev).size() == 4);
 
-    ASSERT_SAME_TYPE(decltype(rev.size()), size_t);
-    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
+    ASSERT_SAME_TYPE(decltype(rev.size()), std::size_t);
+    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);
   }
   // Non-common, non-const (move only) bidirectional range.
   {
     auto rev = std::ranges::reverse_view(BidirSizedRange<MoveOnly>{buffer, 4});
     assert(std::move(rev).size() == 4);
 
-    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
+    ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);
   }
 
   return true;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.range.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.range.pass.cpp
index 605e3d5..bbe08be 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.range.pass.cpp
@@ -11,7 +11,7 @@
 // template <input_range Range>
 //   requires constructible_from<View, views::all_t<Range>> &&
 //             constructible_from<Pattern, single_view<range_value_t<Range>>>
-// constexpr split_view(Range&& r, range_value_t<Range> e);
+// constexpr split_view(Range&& r, range_value_t<Range> e); // explicit since C++23
 
 #include <algorithm>
 #include <cassert>
@@ -21,6 +21,9 @@
 #include <type_traits>
 #include <utility>
 
+#include "test_convertible.h"
+#include "test_macros.h"
+
 struct Counting {
   int* times_copied = nullptr;
   int* times_moved  = nullptr;
@@ -68,6 +71,22 @@
 static_assert(std::ranges::view<StrView>);
 static_assert(std::is_copy_constructible_v<StrView>);
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(
+    !test_convertible<std::ranges::split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
+    "This constructor must be explicit");
+
+# else
+
+static_assert(
+    test_convertible<std::ranges::split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
+    "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
     using V = std::ranges::split_view<StrView, StrView>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.view.pass.cpp
index ad206ee..963f85f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/ctor.view.pass.cpp
@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr split_view(View base, Pattern pattern);
+// constexpr split_view(View base, Pattern pattern); // explicit since C++23
 
 #include <algorithm>
 #include <cassert>
@@ -16,6 +16,9 @@
 #include <string_view>
 #include <utility>
 
+#include "test_convertible.h"
+#include "test_macros.h"
+
 struct ViewWithCounting : std::ranges::view_base {
   int* times_copied = nullptr;
   int* times_moved  = nullptr;
@@ -38,6 +41,23 @@
   constexpr bool operator==(const ViewWithCounting&) const { return true; }
 };
 
+using View    = ViewWithCounting;
+using Pattern = ViewWithCounting;
+
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::split_view<View, Pattern>, View, Pattern>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::split_view<View, Pattern>, View, Pattern>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
     std::string_view input = "abc def";
@@ -48,9 +68,6 @@
 
   // Make sure the arguments are moved, not copied.
   {
-    using View    = ViewWithCounting;
-    using Pattern = ViewWithCounting;
-
     // Arguments are lvalues.
     {
       int view_copied = 0, view_moved = 0, pattern_copied = 0, pattern_moved = 0;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/general.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/general.pass.cpp
index 8684e3b..5389d93 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/general.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/general.pass.cpp
@@ -33,13 +33,13 @@
   return std::ranges::equal(view, expected, std::ranges::equal);
 }
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr bool test_function_call(T&& input, Separator&& separator, std::array<U, M> expected) {
   std::ranges::split_view v(input, separator);
   return is_equal(v, expected);
 }
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr bool test_with_piping(T&& input, Separator&& separator, std::array<U, M> expected) {
   auto expected_it = expected.begin();
   for (auto e : input | std::ranges::views::split(separator)) {
@@ -124,7 +124,7 @@
   return std::string_view(str);
 };
 
-template <class T, class Separator, class U, size_t M>
+template <class T, class Separator, class U, std::size_t M>
 constexpr void test_one(T&& input, Separator&& separator, std::array<U, M> expected) {
   assert(test_function_call(input, separator, expected));
   assert(test_with_piping(input, separator, expected));
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/types.h
index ff2ce38..aa47faf 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.split/types.h
@@ -20,7 +20,7 @@
 struct ForwardIterBase {
   using iterator_concept = std::forward_iterator_tag;
   using value_type       = int;
-  using difference_type  = intptr_t;
+  using difference_type  = std::intptr_t;
 
   constexpr int operator*() const { return 5; }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/ctor.view.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/ctor.view.pass.cpp
index 7adeb67..469b269 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/ctor.view.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/ctor.view.pass.cpp
@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr take_while_view(V base, Pred pred);
+// constexpr take_while_view(V base, Pred pred); // explicit since C++23
 
 #include <cassert>
 #include <ranges>
@@ -16,6 +16,8 @@
 #include <utility>
 
 #include "MoveOnly.h"
+#include "test_convertible.h"
+#include "test_macros.h"
 
 struct View : std::ranges::view_base {
   MoveOnly mo;
@@ -32,9 +34,23 @@
   bool operator()(int) const;
 };
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::take_while_view<View, Pred>, View, Pred>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert(test_convertible<std::ranges::take_while_view<View, Pred>, View, Pred>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
-    std::ranges::take_while_view<View, Pred> twv = {View{{}, MoveOnly{5}}, Pred{}};
+    std::ranges::take_while_view<View, Pred> twv{View{{}, MoveOnly{5}}, Pred{}};
     assert(twv.pred().moved);
     assert(!twv.pred().copied);
     assert(std::move(twv).base().mo.get() == 5);
@@ -45,5 +61,6 @@
 int main(int, char**) {
   test();
   static_assert(test());
+
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/sentinel/equality.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/sentinel/equality.pass.cpp
index 3d5b835..db3e576 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/sentinel/equality.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take.while/sentinel/equality.pass.cpp
@@ -26,7 +26,7 @@
   int* it_;
 
   using value_type       = int;
-  using difference_type  = intptr_t;
+  using difference_type  = std::intptr_t;
   using iterator_concept = std::input_iterator_tag;
 
   constexpr decltype(auto) operator*() const { return *it_; }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/begin.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/begin.pass.cpp
index ad5442f..f2ac62e 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/begin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/begin.pass.cpp
@@ -22,7 +22,7 @@
 struct NonCommonSimpleView : std::ranges::view_base {
   int* begin() const;
   sentinel_wrapper<int*> end() const;
-  size_t size() { return 0; }  // deliberately non-const
+  std::size_t size() { return 0; }  // deliberately non-const
 };
 static_assert(std::ranges::sized_range<NonCommonSimpleView>);
 static_assert(!std::ranges::sized_range<const NonCommonSimpleView>);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.default.pass.cpp
index 33071a9..98fd1e0 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.default.pass.cpp
@@ -10,8 +10,9 @@
 
 // take_view() requires default_initializable<V> = default;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 int buff[8] = {1, 2, 3, 4, 5, 6, 7, 8};
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.view_count.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.view_count.pass.cpp
index 63b936d..f37ffb0 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.view_count.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/ctor.view_count.pass.cpp
@@ -8,16 +8,31 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr take_view(V base, range_difference_t<V> count);
+// constexpr take_view(V base, range_difference_t<V> count); // explicit since C++23
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
 
-#include "test_macros.h"
+#include "test_convertible.h"
 #include "test_iterators.h"
+#include "test_macros.h"
 #include "test_range.h"
 #include "types.h"
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::take_view<View>, View, std::ranges::range_difference_t<View>>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert(test_convertible<std::ranges::take_view<View>, View, std::ranges::range_difference_t<View>>(),
+              "This constructor must be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/types.h
index 09549a9..db80e68 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.take/types.h
@@ -54,4 +54,15 @@
 static_assert(std::ranges::random_access_range<SizedRandomAccessView>);
 static_assert(std::ranges::sized_range<SizedRandomAccessView>);
 
+struct View : std::ranges::view_base {
+  constexpr explicit View(int* b, int* e) : begin_(b), end_(e) { }
+
+  constexpr int* begin() const { return begin_; }
+  constexpr int* end() const { return end_; }
+
+private:
+  int* begin_;
+  int* end_;
+};
+
 #endif // TEST_STD_RANGES_RANGE_ADAPTORS_RANGE_TAKE_TYPES_H
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/ctor.view_function.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/ctor.view_function.pass.cpp
index 7ce0426..63a43d1 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/ctor.view_function.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/ctor.view_function.pass.cpp
@@ -8,14 +8,16 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr transform_view(View, F);
-
-#include <ranges>
+// constexpr transform_view(View, F); // explicit since C++23
 
 #include <cassert>
+#include <ranges>
+
+#include "test_convertible.h"
+#include "test_macros.h"
 
 struct Range : std::ranges::view_base {
-  constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) { }
+  constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) {}
   constexpr int* begin() const { return begin_; }
   constexpr int* end() const { return end_; }
 
@@ -28,6 +30,20 @@
   constexpr int operator()(int i) const { return i + 100; }
 };
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::transform_view<Range, F>, Range, F>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::transform_view<Range, F>, Range, F>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   int buff[] = {1, 2, 3, 4, 5, 6, 7, 8};
 
@@ -41,16 +57,6 @@
     assert(view[7] == 108);
   }
 
-  {
-    Range range(buff, buff + 8);
-    F f;
-    std::ranges::transform_view<Range, F> view = {range, f};
-    assert(view[0] == 101);
-    assert(view[1] == 102);
-    // ...
-    assert(view[7] == 108);
-  }
-
   return true;
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/general.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/general.pass.cpp
index f519066..f48aae6 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/general.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/general.pass.cpp
@@ -39,7 +39,7 @@
   return std::ranges::transform_view(range, [](char c) { return std::toupper(c); });
 }
 
-template<class E1, class E2, size_t N, class Join = std::plus<E1>>
+template<class E1, class E2, std::size_t N, class Join = std::plus<E1>>
 auto joinArrays(E1 (&a)[N], E2 (&b)[N], Join join = Join()) {
   return std::ranges::transform_view(a, [&a, &b, join](auto& x) {
     auto idx = (&x) - a;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/iterator/types.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/iterator/types.pass.cpp
index 2c095d8..25d8936 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/iterator/types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/iterator/types.pass.cpp
@@ -44,6 +44,15 @@
     static_assert(std::same_as<typename TIter::difference_type, std::ptrdiff_t>);
   }
   {
+    // Member typedefs for random access iterator, LWG3798 rvalue reference.
+    using TView = std::ranges::transform_view<RandomAccessView, IncrementRvalueRef>;
+    using TIter = std::ranges::iterator_t<TView>;
+    static_assert(std::same_as<typename TIter::iterator_concept, std::random_access_iterator_tag>);
+    static_assert(std::same_as<typename TIter::iterator_category, std::random_access_iterator_tag>);
+    static_assert(std::same_as<typename TIter::value_type, int>);
+    static_assert(std::same_as<typename TIter::difference_type, std::ptrdiff_t>);
+  }
+  {
     // Member typedefs for random access iterator/not-lvalue-ref.
     using TView = std::ranges::transform_view<RandomAccessView, PlusOneMutable>;
     using TIter = std::ranges::iterator_t<TView>;
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/types.h
index d31db8d..14f8572 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.transform/types.h
@@ -9,6 +9,8 @@
 #ifndef TEST_STD_RANGES_RANGE_ADAPTORS_RANGE_TRANSFORM_TYPES_H
 #define TEST_STD_RANGES_RANGE_ADAPTORS_RANGE_TRANSFORM_TYPES_H
 
+#include <cstddef>
+
 #include "test_macros.h"
 #include "test_iterators.h"
 #include "test_range.h"
@@ -106,7 +108,7 @@
 struct SizedSentinelNotConstView : std::ranges::view_base {
   ForwardIter begin() const;
   int *end() const;
-  size_t size();
+  std::size_t size();
 };
 // TODO: remove these bogus operators
 bool operator==(const ForwardIter &lhs, int* rhs);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/arithmetic.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/arithmetic.pass.cpp
index ce7858f..efe64b3 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/arithmetic.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/arithmetic.pass.cpp
@@ -63,7 +63,7 @@
     assert(&y1 == &(b[3]));
 
     using Iter = decltype(it1);
-    static_assert(canPlusEqual<Iter, intptr_t>);
+    static_assert(canPlusEqual<Iter, std::intptr_t>);
   }
 
   {
@@ -83,7 +83,7 @@
     assert(&y1 == &(b[2]));
 
     using Iter = decltype(it1);
-    static_assert(canMinusEqual<Iter, intptr_t>);
+    static_assert(canMinusEqual<Iter, std::intptr_t>);
   }
 
   {
@@ -116,12 +116,12 @@
     // One of the ranges is not random access
     std::ranges::zip_view v(a, b, ForwardSizedView{buffer1});
     using Iter = decltype(v.begin());
-    static_assert(!std::invocable<std::plus<>, Iter, intptr_t>);
-    static_assert(!std::invocable<std::plus<>, intptr_t, Iter>);
-    static_assert(!canPlusEqual<Iter, intptr_t>);
-    static_assert(!std::invocable<std::minus<>, Iter, intptr_t>);
+    static_assert(!std::invocable<std::plus<>, Iter, std::intptr_t>);
+    static_assert(!std::invocable<std::plus<>, std::intptr_t, Iter>);
+    static_assert(!canPlusEqual<Iter, std::intptr_t>);
+    static_assert(!std::invocable<std::minus<>, Iter, std::intptr_t>);
     static_assert(std::invocable<std::minus<>, Iter, Iter>);
-    static_assert(!canMinusEqual<Iter, intptr_t>);
+    static_assert(!canMinusEqual<Iter, std::intptr_t>);
   }
 
   {
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/compare.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/compare.pass.cpp
index 19b5b99..fcbff72 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/compare.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/compare.pass.cpp
@@ -41,7 +41,7 @@
 
   using iterator_category = std::random_access_iterator_tag;
   using value_type = int;
-  using difference_type = intptr_t;
+  using difference_type = std::intptr_t;
 
   constexpr int& operator*() const { return *it_; }
   constexpr int& operator[](difference_type n) const { return it_[n]; }
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/ctor.default.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/ctor.default.pass.cpp
index 8c038ab..98078b2 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/ctor.default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/ctor.default.pass.cpp
@@ -20,7 +20,7 @@
 
   using iterator_category = std::random_access_iterator_tag;
   using value_type = int;
-  using difference_type = intptr_t;
+  using difference_type = std::intptr_t;
 
   constexpr int operator*() const { return i; }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/member_types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/member_types.compile.pass.cpp
index 6b0c086..c19f6c2 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/member_types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/iterator/member_types.compile.pass.cpp
@@ -144,16 +144,16 @@
 
   {
     // difference_type of single view
-    std::ranges::zip_view v{DiffTypeRange<intptr_t>{}};
+    std::ranges::zip_view v{DiffTypeRange<std::intptr_t>{}};
     using Iter = decltype(v.begin());
-    static_assert(std::is_same_v<Iter::difference_type, intptr_t>);
+    static_assert(std::is_same_v<Iter::difference_type, std::intptr_t>);
   }
 
   {
     // difference_type of multiple views should be the common type
-    std::ranges::zip_view v{DiffTypeRange<intptr_t>{}, DiffTypeRange<std::ptrdiff_t>{}};
+    std::ranges::zip_view v{DiffTypeRange<std::intptr_t>{}, DiffTypeRange<std::ptrdiff_t>{}};
     using Iter = decltype(v.begin());
-    static_assert(std::is_same_v<Iter::difference_type, std::common_type_t<intptr_t, std::ptrdiff_t>>);
+    static_assert(std::is_same_v<Iter::difference_type, std::common_type_t<std::intptr_t, std::ptrdiff_t>>);
   }
 
   const std::array foos{Foo{}};
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/minus.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/minus.pass.cpp
index 7f8b513..c4c85bc 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/minus.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/minus.pass.cpp
@@ -34,7 +34,7 @@
 
   using iterator_category = std::forward_iterator_tag;
   using value_type = int;
-  using difference_type = intptr_t;
+  using difference_type = std::intptr_t;
 
   convertible_forward_sized_iterator() = default;
   constexpr convertible_forward_sized_iterator(Base it) : it_(it) {}
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
index 299ffea..fa82b83 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
@@ -201,7 +201,7 @@
 
   using iterator_category = std::forward_iterator_tag;
   using value_type = int;
-  using difference_type = intptr_t;
+  using difference_type = std::intptr_t;
   using pointer = Base;
   using reference = decltype(*Base{});
 
@@ -405,7 +405,7 @@
 
   using iterator_category = std::input_iterator_tag;
   using value_type = int;
-  using difference_type = intptr_t;
+  using difference_type = std::intptr_t;
 
   constexpr int operator*() const { return i; }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.first.last.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.first.last.pass.cpp
index 0b02cad..ee0e7fc 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.first.last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.first.last.pass.cpp
@@ -8,14 +8,55 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// constexpr iota_view(iterator first, see below last);
+// constexpr iota_view(iterator first, see below last); // explicit since C++23
 
 #include <ranges>
 #include <cassert>
 
+#include "test_convertible.h"
 #include "test_macros.h"
 #include "types.h"
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+std::ranges::iota_view<SomeInt, SomeInt> view;
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
+              "This constructor must be explicit");
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt>,
+                                decltype(std::ranges::iota_view{SomeInt{0}}.begin()),
+                                decltype(std::unreachable_sentinel)>(),
+              "This constructor must be explicit");
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert(test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
+                               decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
+                               decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
+              "This constructor must not be explicit");
+
+static_assert(test_convertible<std::ranges::iota_view<SomeInt>,
+                               decltype(std::ranges::iota_view{SomeInt{0}}.begin()),
+                               decltype(std::unreachable_sentinel)>(),
+              "This constructor must not be explicit");
+
+static_assert(test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
+                               decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
+                               decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
     std::ranges::iota_view commonView(SomeInt(0), SomeInt(10));
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp
index 906e0e0..7528e1c 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp
@@ -14,13 +14,52 @@
 TEST_GCC_DIAGNOSTIC_IGNORED("-Wsign-compare")
 TEST_MSVC_DIAGNOSTIC_IGNORED(4018 4389) // various "signed/unsigned mismatch"
 
-// constexpr iota_view(type_identity_t<W> value, type_identity_t<Bound> bound);
+// constexpr iota_view(type_identity_t<W> value, type_identity_t<Bound> bound); // explicit since C++23
 
 #include <ranges>
 #include <cassert>
 
+#include "test_convertible.h"
 #include "types.h"
 
+// SFINAE tests.
+
+#if TEST_STD_VER >= 23
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
+              "This constructor must be explicit");
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt>,
+                                decltype(std::ranges::iota_view<SomeInt>{}.begin()),
+                                decltype(std::unreachable_sentinel)>(),
+              "This constructor must be explicit");
+
+static_assert(!test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
+              "This constructor must be explicit");
+
+#else
+
+static_assert( test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
+                                decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
+              "This constructor must not be explicit");
+
+static_assert( test_convertible<std::ranges::iota_view<SomeInt>,
+                                decltype(std::ranges::iota_view<SomeInt>{}.begin()),
+                                decltype(std::unreachable_sentinel)>(),
+              "This constructor must not be explicit");
+
+static_assert( test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
+                                decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
+              "This constructor must not be explicit");
+
+#endif // TEST_STD_VER >= 23
+
 constexpr bool test() {
   {
     std::ranges::iota_view<SomeInt, SomeInt> io(SomeInt(0), SomeInt(10));
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.pass.cpp
index ac5a25b..cda372e 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.pass.cpp
@@ -10,8 +10,9 @@
 
 // constexpr explicit iota_view(W value);
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/ctor.value.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/ctor.value.pass.cpp
index 5a71837..a84cb91 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/ctor.value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/ctor.value.pass.cpp
@@ -10,8 +10,9 @@
 
 // constexpr explicit iterator(W value);
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/decrement.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/decrement.pass.cpp
index 45b5e17..3b1613e 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/decrement.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/decrement.pass.cpp
@@ -11,8 +11,9 @@
 // constexpr iterator& operator--() requires decrementable<W>;
 // constexpr iterator operator--(int) requires decrementable<W>;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/increment.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/increment.pass.cpp
index a979a2d..d99e57f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/increment.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/increment.pass.cpp
@@ -12,8 +12,9 @@
 // constexpr void operator++(int);
 // constexpr iterator operator++(int) requires incrementable<W>;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/member_typedefs.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/member_typedefs.compile.pass.cpp
index e009bfc..c2f7fd1 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/member_typedefs.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/member_typedefs.compile.pass.cpp
@@ -13,6 +13,7 @@
 #include <cassert>
 #include <cstdint>
 #include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus.pass.cpp
index ff425ba..705a744 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus.pass.cpp
@@ -16,6 +16,7 @@
 #include <cassert>
 #include <cstdint>
 #include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus_eq.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus_eq.pass.cpp
index 6b16982..b46a34d 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus_eq.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/minus_eq.pass.cpp
@@ -11,8 +11,9 @@
 // constexpr iterator& operator-=(difference_type n)
 //   requires advanceable<W>;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus.pass.cpp
index aaff730..b66dc78 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus.pass.cpp
@@ -13,8 +13,9 @@
 // friend constexpr iterator operator+(difference_type n, iterator i)
 //   requires advanceable<W>;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus_eq.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus_eq.pass.cpp
index ded3c97..fa9135d 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus_eq.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/iterator/plus_eq.pass.cpp
@@ -11,8 +11,9 @@
 // constexpr iterator& operator+=(difference_type n)
 //   requires advanceable<W>;
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/sentinel/ctor.value.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/sentinel/ctor.value.pass.cpp
index c465345..a56369b 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/sentinel/ctor.value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/sentinel/ctor.value.pass.cpp
@@ -10,8 +10,9 @@
 
 // constexpr explicit sentinel(Bound bound);
 
-#include <ranges>
 #include <cassert>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "../types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/views_iota.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/views_iota.pass.cpp
index d7310cc..a6b268f 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/views_iota.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.iota.view/views_iota.pass.cpp
@@ -10,9 +10,10 @@
 
 // views::iota
 
-#include <ranges>
 #include <cassert>
 #include <concepts>
+#include <ranges>
+#include <type_traits>
 
 #include "test_macros.h"
 #include "types.h"
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.single.view/size.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.single.view/size.pass.cpp
index 7d6a72d..f57bc40 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.single.view/size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.factories/range.single.view/size.pass.cpp
@@ -20,28 +20,28 @@
     auto sv = std::ranges::single_view<int>(42);
     assert(sv.size() == 1);
 
-    ASSERT_SAME_TYPE(decltype(sv.size()), size_t);
+    ASSERT_SAME_TYPE(decltype(sv.size()), std::size_t);
     static_assert(noexcept(sv.size()));
   }
   {
     const auto sv = std::ranges::single_view<int>(42);
     assert(sv.size() == 1);
 
-    ASSERT_SAME_TYPE(decltype(sv.size()), size_t);
+    ASSERT_SAME_TYPE(decltype(sv.size()), std::size_t);
     static_assert(noexcept(sv.size()));
   }
   {
     auto sv = std::ranges::single_view<int>(42);
     assert(std::ranges::size(sv) == 1);
 
-    ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), size_t);
+    ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), std::size_t);
     static_assert(noexcept(std::ranges::size(sv)));
   }
   {
     const auto sv = std::ranges::single_view<int>(42);
     assert(std::ranges::size(sv) == 1);
 
-    ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), size_t);
+    ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), std::size_t);
     static_assert(noexcept(std::ranges::size(sv)));
   }
 
@@ -49,7 +49,7 @@
   {
     assert(std::ranges::single_view<int>::size() == 1);
 
-    ASSERT_SAME_TYPE(decltype(std::ranges::single_view<int>::size()), size_t);
+    ASSERT_SAME_TYPE(decltype(std::ranges::single_view<int>::size()), std::size_t);
     static_assert(noexcept(std::ranges::single_view<int>::size()));
   }
 
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.req/range.range/helper_aliases.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.req/range.range/helper_aliases.compile.pass.cpp
index 1cc9403..1367e29 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.req/range.range/helper_aliases.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.req/range.range/helper_aliases.compile.pass.cpp
@@ -20,6 +20,9 @@
 // template<range R>
 // using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<R>>;
 
+// template <range R>
+// using range_common_reference_t = iter_common_reference_t<iterator_t<R>>;
+
 #include <ranges>
 
 #include <concepts>
@@ -27,9 +30,8 @@
 #include "test_iterators.h"
 #include "test_range.h"
 
-
-
 static_assert(std::same_as<std::ranges::range_difference_t<test_range<cpp20_input_iterator> >, std::iter_difference_t<int*> >);
 static_assert(std::same_as<std::ranges::range_value_t<test_range<cpp20_input_iterator> >, std::iter_value_t<int*> >);
 static_assert(std::same_as<std::ranges::range_reference_t<test_range<cpp20_input_iterator> >, std::iter_reference_t<int*> >);
 static_assert(std::same_as<std::ranges::range_rvalue_reference_t<test_range<cpp20_input_iterator> >, std::iter_rvalue_reference_t<int*> >);
+static_assert(std::same_as<std::ranges::range_common_reference_t<test_range<cpp20_input_iterator> >, std::iter_common_reference_t<int*> >);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/ctor.begin_end_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/ctor.begin_end_size.pass.cpp
index c83e83b..52a66f6 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/ctor.begin_end_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/ctor.begin_end_size.pass.cpp
@@ -28,8 +28,8 @@
 static_assert(!std::is_constructible_v<SizedSentinelForwardSubrange, Empty, ConditionallyConvertibleIter, ConditionallyConvertibleIter::udifference_type>); // 1.
 static_assert( std::is_constructible_v<ConvertibleSizedSentinelForwardSubrange, ConvertibleSizedSentinelForwardIter, int*, ConvertibleSizedSentinelForwardIter::udifference_type>); // 2.
 static_assert( std::is_constructible_v<SizedSentinelForwardSubrange, ConditionallyConvertibleIter, ConditionallyConvertibleIter, ConditionallyConvertibleIter::udifference_type>); // 3. (Same as default case.)
-static_assert(!std::is_constructible_v<SizedIntPtrSubrange, long*, int*, size_t>); // 4.
-static_assert( std::is_constructible_v<SizedIntPtrSubrange, int*, int*, size_t>); // 5.
+static_assert(!std::is_constructible_v<SizedIntPtrSubrange, long*, int*, std::size_t>); // 4.
+static_assert( std::is_constructible_v<SizedIntPtrSubrange, int*, int*, std::size_t>); // 5.
 
 constexpr bool test() {
   SizedSentinelForwardSubrange a(ConditionallyConvertibleIter(globalBuff), ConditionallyConvertibleIter(globalBuff + 8), 8);
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/get.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/get.pass.cpp
index 5e8969b..e1daf88 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/get.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/get.pass.cpp
@@ -16,7 +16,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-template<size_t I, class S>
+template<std::size_t I, class S>
 concept HasGet = requires {
   std::get<I>(std::declval<S>());
 };
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/types.h b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/types.h
index e730d6a..8659350 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/types.h
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/range.subrange/types.h
@@ -211,7 +211,7 @@
 
   constexpr ForwardIter begin() const { return ForwardIter(globalBuff); }
   constexpr sentinel end() const { return sentinel{globalBuff + 8}; }
-  constexpr size_t size() const { return 8; }
+  constexpr std::size_t size() const { return 8; }
 };
 
 template<>
diff --git a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
index b1ed28f..2fc2fa8 100644
--- a/third_party/llvm-project/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
@@ -95,7 +95,7 @@
   int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
   constexpr ForwardIter begin() const { return ForwardIter(const_cast<int*>(buff)); }
   constexpr ForwardIter end() const { return ForwardIter(const_cast<int*>(buff) + 8); }
-  constexpr size_t size() const { return 10; }
+  constexpr std::size_t size() const { return 10; }
 };
 static_assert(std::ranges::view<SizeIsTen>);
 
@@ -262,7 +262,7 @@
 }
 
 template<class T>
-concept SubscriptInvocable = requires (T const& obj, size_t n) { obj[n]; };
+concept SubscriptInvocable = requires (T const& obj, std::size_t n) { obj[n]; };
 
 constexpr bool testSubscript() {
   static_assert(!SubscriptInvocable<ForwardRange>);
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.locale.pass.cpp
index 7d53cd9..6470b95 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.locale.pass.cpp
@@ -44,7 +44,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -60,7 +60,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -87,7 +87,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -103,7 +103,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
index f3385f4..988beec 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/awk.pass.cpp
@@ -260,7 +260,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -275,7 +275,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -290,7 +290,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -323,7 +323,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -338,7 +338,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -353,7 +353,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -375,7 +375,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -391,7 +391,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -407,7 +407,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -431,7 +431,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -516,7 +516,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -539,7 +539,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -569,7 +569,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -585,7 +585,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -601,7 +601,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -643,7 +643,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == 4);
+        assert((std::size_t)m.length(0) == 4);
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -659,7 +659,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<char>::length(s));
-        assert((size_t)m.length(0) == std::char_traits<char>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -677,7 +677,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s+1);
-        assert((size_t)m.length(0) == 1);
+        assert((std::size_t)m.length(0) == 1);
         assert(m.position(0) == 0);
         assert(m.str(0) == L"a");
     }
@@ -692,7 +692,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s+2);
-        assert((size_t)m.length(0) == 2);
+        assert((std::size_t)m.length(0) == 2);
         assert(m.position(0) == 0);
         assert(m.str(0) == L"ab");
     }
@@ -902,7 +902,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -917,7 +917,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -932,7 +932,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -965,7 +965,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -980,7 +980,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -995,7 +995,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1017,7 +1017,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1033,7 +1033,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1049,7 +1049,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1073,7 +1073,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1158,7 +1158,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1181,7 +1181,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1211,7 +1211,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1227,7 +1227,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1243,7 +1243,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1301,7 +1301,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
-        assert((size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
+        assert((std::size_t)m.length(0) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.locale.pass.cpp
index 488385f..430d35f 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.locale.pass.cpp
@@ -46,7 +46,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -62,7 +62,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -89,7 +89,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -105,7 +105,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.pass.cpp
index d77349d..9765a07 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/basic.pass.cpp
@@ -380,7 +380,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -398,7 +398,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -423,7 +423,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -518,7 +518,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -541,7 +541,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -571,7 +571,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -587,7 +587,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -603,7 +603,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -894,7 +894,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -909,7 +909,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -924,7 +924,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -957,7 +957,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -972,7 +972,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -987,7 +987,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1008,7 +1008,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -1026,7 +1026,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -1051,7 +1051,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -1146,7 +1146,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1169,7 +1169,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1199,7 +1199,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1215,7 +1215,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1231,7 +1231,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.locale.pass.cpp
index 0f49b9f..b512fa9 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.locale.pass.cpp
@@ -45,7 +45,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -61,7 +61,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -86,7 +86,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -102,7 +102,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
index 58502aa..4face8b 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
@@ -259,7 +259,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -274,7 +274,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -289,7 +289,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -322,7 +322,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -337,7 +337,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -352,7 +352,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -374,7 +374,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -392,7 +392,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -407,7 +407,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -431,7 +431,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -509,7 +509,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -530,7 +530,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -557,7 +557,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -572,7 +572,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -587,7 +587,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -665,7 +665,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<char>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -907,7 +907,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -922,7 +922,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -937,7 +937,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -970,7 +970,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -985,7 +985,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1000,7 +1000,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1022,7 +1022,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1040,7 +1040,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1055,7 +1055,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1079,7 +1079,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1157,7 +1157,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1178,7 +1178,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1205,7 +1205,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1220,7 +1220,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1235,7 +1235,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1301,7 +1301,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.locale.pass.cpp
index 1e7ded6..472dc19 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.locale.pass.cpp
@@ -46,7 +46,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -62,7 +62,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -89,7 +89,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -105,7 +105,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.pass.cpp
index b3be567..73c1d83 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.match/extended.pass.cpp
@@ -259,7 +259,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -274,7 +274,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -289,7 +289,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -322,7 +322,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -337,7 +337,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -352,7 +352,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -374,7 +374,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -390,7 +390,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -406,7 +406,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -430,7 +430,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -448,7 +448,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -533,7 +533,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -556,7 +556,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -586,7 +586,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -602,7 +602,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -618,7 +618,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -903,7 +903,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -918,7 +918,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -933,7 +933,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -966,7 +966,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -981,7 +981,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -996,7 +996,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1018,7 +1018,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1034,7 +1034,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1050,7 +1050,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1074,7 +1074,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -1092,7 +1092,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1177,7 +1177,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1200,7 +1200,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1230,7 +1230,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1246,7 +1246,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1262,7 +1262,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.locale.pass.cpp
index f2a89d6..9125df4 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.locale.pass.cpp
@@ -46,7 +46,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -62,7 +62,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -89,7 +89,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -105,7 +105,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.pass.cpp
index 741a74f..2c23cf0 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/awk.pass.cpp
@@ -323,7 +323,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -338,7 +338,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -353,7 +353,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -386,7 +386,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -401,7 +401,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -416,7 +416,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -438,7 +438,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -454,7 +454,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -470,7 +470,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -494,7 +494,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -588,7 +588,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -611,7 +611,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -641,7 +641,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -657,7 +657,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -673,7 +673,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -749,7 +749,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<char>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1055,7 +1055,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1070,7 +1070,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1085,7 +1085,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1118,7 +1118,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1133,7 +1133,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1148,7 +1148,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1170,7 +1170,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1186,7 +1186,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1202,7 +1202,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1226,7 +1226,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1320,7 +1320,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1343,7 +1343,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1373,7 +1373,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1389,7 +1389,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1405,7 +1405,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1481,7 +1481,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.locale.pass.cpp
index fff693e..f85b6a4 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.locale.pass.cpp
@@ -46,7 +46,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -62,7 +62,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -89,7 +89,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -105,7 +105,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.pass.cpp
index 287ca99..99f94f2 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/basic.pass.cpp
@@ -443,7 +443,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -461,7 +461,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -486,7 +486,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -590,7 +590,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -613,7 +613,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -643,7 +643,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -659,7 +659,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -675,7 +675,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1047,7 +1047,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1062,7 +1062,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1077,7 +1077,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1110,7 +1110,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1125,7 +1125,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1140,7 +1140,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1161,7 +1161,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -1179,7 +1179,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -1204,7 +1204,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 3);
@@ -1308,7 +1308,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1331,7 +1331,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1361,7 +1361,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1377,7 +1377,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1393,7 +1393,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.locale.pass.cpp
index bb80b16..aa9441c 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.locale.pass.cpp
@@ -45,7 +45,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -61,7 +61,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -86,7 +86,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -102,7 +102,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
index 00977d3..518c27e 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
@@ -322,7 +322,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -337,7 +337,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -352,7 +352,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -385,7 +385,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -400,7 +400,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -415,7 +415,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -467,7 +467,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -491,7 +491,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -578,7 +578,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -599,7 +599,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -626,7 +626,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -641,7 +641,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -656,7 +656,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -758,7 +758,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<char>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1063,7 +1063,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1078,7 +1078,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1093,7 +1093,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1126,7 +1126,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1141,7 +1141,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1156,7 +1156,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1208,7 +1208,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1232,7 +1232,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1319,7 +1319,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1340,7 +1340,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1367,7 +1367,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1382,7 +1382,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1397,7 +1397,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1499,7 +1499,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.locale.pass.cpp
index bbe39e7..9746e45 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.locale.pass.cpp
@@ -46,7 +46,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -62,7 +62,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -89,7 +89,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -105,7 +105,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.pass.cpp
index 8ffedfc..0ddb49d 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/extended.pass.cpp
@@ -323,7 +323,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -338,7 +338,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -353,7 +353,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -386,7 +386,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -401,7 +401,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -416,7 +416,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -438,7 +438,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -454,7 +454,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -470,7 +470,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -494,7 +494,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -512,7 +512,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -606,7 +606,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -629,7 +629,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -659,7 +659,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -675,7 +675,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -691,7 +691,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<char>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<char>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1057,7 +1057,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1072,7 +1072,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1087,7 +1087,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1120,7 +1120,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1135,7 +1135,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1150,7 +1150,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1172,7 +1172,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1188,7 +1188,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1204,7 +1204,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 4);
@@ -1228,7 +1228,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
         assert(m.length(1) == 2);
@@ -1246,7 +1246,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1340,7 +1340,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1363,7 +1363,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1393,7 +1393,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1409,7 +1409,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
@@ -1425,7 +1425,7 @@
         assert(!m.suffix().matched);
         assert(m.suffix().first == m[0].second);
         assert(m.suffix().second == m[0].second);
-        assert(m.length(0) >= 0 && static_cast<size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
+        assert(m.length(0) >= 0 && static_cast<std::size_t>(m.length(0)) == std::char_traits<wchar_t>::length(s));
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/grep.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/grep.pass.cpp
index 29300a8..3569ad5 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/grep.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.alg/re.alg.search/grep.pass.cpp
@@ -24,7 +24,7 @@
 extern "C" void LLVMFuzzerTestOneInput(const char *data)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
-    size_t size = strlen(data);
+    std::size_t size = strlen(data);
     if (size > 0)
     {
         try
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.results/re.results.size/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/re/re.results/re.results.size/empty.verify.cpp
index 738ed88..4087c24 100644
--- a/third_party/llvm-project/libcxx/test/std/re/re.results/re.results.size/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/re/re.results/re.results.size/empty.verify.cpp
@@ -15,12 +15,7 @@
 
 #include <regex>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::match_results<const char*> c;
     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/re/re.submatch/re.submatch.members/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/re/re.submatch/re.submatch.members/swap.pass.cpp
new file mode 100644
index 0000000..9e93370
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/re/re.submatch/re.submatch.members/swap.pass.cpp
@@ -0,0 +1,76 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <regex>
+
+// template <class BidirectionalIterator> class sub_match;
+
+// void swap(sub_match& s) noexcept(see below);
+
+#include <regex>
+#include <cassert>
+#include "test_macros.h"
+
+int main(int, char**) {
+  {
+    using CharT      = char;
+    using SM         = std::sub_match<const CharT*>;
+    const CharT s1[] = {'1', '2', '3', 0};
+    SM sm1;
+    sm1.first   = s1;
+    sm1.second  = s1 + 3;
+    sm1.matched = true;
+
+    SM sm2;
+    const CharT s2[] = {'c', 'a', 't', 0};
+    sm2.first        = s2;
+    sm2.second       = s2 + 3;
+    sm2.matched      = false;
+
+    sm1.swap(sm2);
+
+    assert(sm1.first == s2);
+    assert(sm1.second == s2 + 3);
+    assert(!sm1.matched);
+
+    assert(sm2.first == s1);
+    assert(sm2.second == s1 + 3);
+    assert(sm2.matched);
+
+    ASSERT_NOEXCEPT(sm1.swap(sm2));
+  }
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  {
+    using CharT      = wchar_t;
+    using SM         = std::sub_match<const CharT*>;
+    const CharT s1[] = {L'1', L'2', L'3', 0};
+    SM sm1;
+    sm1.first   = s1;
+    sm1.second  = s1 + 3;
+    sm1.matched = true;
+
+    SM sm2;
+    const CharT s2[] = {L'c', L'a', L't', 0};
+    sm2.first        = s2;
+    sm2.second       = s2 + 3;
+    sm2.matched      = false;
+
+    sm1.swap(sm2);
+
+    assert(sm1.first == s2);
+    assert(sm1.second == s2 + 3);
+    assert(!sm1.matched);
+
+    assert(sm2.first == s1);
+    assert(sm2.second == s1 + 3);
+    assert(sm2.matched);
+
+    ASSERT_NOEXCEPT(sm1.swap(sm2));
+  }
+#endif
+}
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/char_type_hash.fail.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/char_type_hash.fail.cpp
index 721d7e6..339b200 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/char_type_hash.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/char_type_hash.fail.cpp
@@ -33,14 +33,14 @@
     static inline bool eq(char_type __c1, char_type __c2) { return __c1 == __c2; }
     static inline bool lt(char_type __c1, char_type __c2) { return __c1 < __c2; }
 
-    static int compare(const char_type* __s1, const char_type* __s2, size_t __n);
-    static size_t length(const char_type* __s);
-    static const char_type* find(const char_type* __s, size_t __n,
+    static int compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
+    static std::size_t length(const char_type* __s);
+    static const char_type* find(const char_type* __s, std::size_t __n,
                                  const char_type& __a);
 
-    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n);
-    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n);
-    static char_type* assign(char_type* __s, size_t __n, char_type __a);
+    static char_type* move(char_type* __s1, const char_type* __s2, std::size_t __n);
+    static char_type* copy(char_type* __s1, const char_type* __s2, std::size_t __n);
+    static char_type* assign(char_type* __s, std::size_t __n, char_type __a);
 
     static inline int_type not_eof(int_type __c) {
         return eq_int_type(__c, eof()) ? ~eof() : __c;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
index f79b0d9..31e351a 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
@@ -36,12 +36,12 @@
   static bool eq(char_type, char_type);
   static bool lt(char_type, char_type);
 
-  static int              compare(const char_type*, const char_type*, size_t);
-  static size_t           length(const char_type*);
-  static const char_type* find(const char_type*, size_t, const char_type&);
-  static char_type*       move(char_type*, const char_type*, size_t);
-  static char_type*       copy(char_type*, const char_type*, size_t);
-  static char_type*       assign(char_type*, size_t, char_type);
+  static int              compare(const char_type*, const char_type*, std::size_t);
+  static std::size_t           length(const char_type*);
+  static const char_type* find(const char_type*, std::size_t, const char_type&);
+  static char_type*       move(char_type*, const char_type*, std::size_t);
+  static char_type*       copy(char_type*, const char_type*, std::size_t);
+  static char_type*       assign(char_type*, std::size_t, char_type);
 
   static int_type  not_eof(int_type);
   static char_type to_char_type(int_type);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string.literals/noexcept.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string.literals/noexcept.compile.pass.cpp
index 7f040e5..8e2cae7 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string.literals/noexcept.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string.literals/noexcept.compile.pass.cpp
@@ -9,6 +9,7 @@
 // UNSUPPORTED: c++03, c++11
 
 #include <string>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
index 3e17d07..9530950 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
@@ -76,7 +76,7 @@
 };
 
 TEST_CONSTEXPR_CXX20 bool test() {
-  meta::for_each(meta::character_types(), TestCaller());
+  types::for_each(types::character_types(), TestCaller());
 
   return true;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/empty.verify.cpp
index 26a4daf..8ba11ee 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/empty.verify.cpp
@@ -16,21 +16,7 @@
 
 #include <string>
 
-#include "test_macros.h"
-
-TEST_CONSTEXPR_CXX20 bool test() {
+void f() {
   std::string c;
   c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-  return true;
-}
-
-int main(int, char**)
-{
-  test();
-#if TEST_STD_VER > 17
-  static_assert(test());
-#endif
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
index b8e4198..ca4b05b 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
@@ -30,7 +30,7 @@
 test1(const S& s)
 {
     S s2(s);
-    const size_t sz = s2.max_size() - 1;
+    const std::size_t sz = s2.max_size() - 1;
     try { s2.resize(sz, 'x'); }
     catch ( const std::bad_alloc & ) { return ; }
     assert ( s2.size() ==  sz );
@@ -41,7 +41,7 @@
 test2(const S& s)
 {
     S s2(s);
-    const size_t sz = s2.max_size();
+    const std::size_t sz = s2.max_size();
     try { s2.resize(sz, 'x'); }
     catch ( const std::bad_alloc & ) { return ; }
     assert ( s.size() ==  sz );
@@ -76,7 +76,7 @@
 constexpr bool test_constexpr() {
   std::string str;
 
-  size_t size = str.max_size();
+  std::size_t size = str.max_size();
   assert(size > 0);
 
   return true;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
index 65907e0..80f4e87 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
@@ -7,12 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: no-exceptions
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // Prior to http://llvm.org/D123580, there was a bug with how the max_size()
 // was calculated. That was inlined into some functions in the dylib, which leads
 // to failures when running this test against an older system dylib.
-// XFAIL: use_system_cxx_lib && target=arm64-apple-macosx{{11.0|12.0}}
+// XFAIL: stdlib=apple-libc++ && target=arm64-apple-macosx{{11.0|12.0}}
 
 // <string>
 
@@ -31,7 +31,7 @@
 {
     assert(s.max_size() >= s.size());
     S s2(s);
-    const size_t sz = s2.max_size() + 1;
+    const std::size_t sz = s2.max_size() + 1;
     try { s2.resize(sz, 'x'); }
     catch ( const std::length_error & ) { return ; }
     assert ( false );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
index 1b8a5da..632f7fd 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
@@ -14,9 +14,7 @@
 
 #include <string>
 
-int main(int, char**)
-{
+void f() {
     std::string s;
     s.reserve(); // expected-warning {{'reserve' is deprecated}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
index 2999114..45c5867 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
@@ -12,7 +12,7 @@
 
 // This test relies on https://llvm.org/PR45368 being fixed, which isn't in
 // older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 #include <string>
 #include <stdexcept>
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
index b22a903..3fafde8 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
@@ -21,7 +21,7 @@
 #include "test_macros.h"
 
 template <class S>
-constexpr void test_appending(size_t k, size_t N, size_t new_capacity) {
+constexpr void test_appending(std::size_t k, size_t N, size_t new_capacity) {
   assert(N > k);
   assert(new_capacity >= N);
   auto s = S(k, 'a');
@@ -40,7 +40,7 @@
 }
 
 template <class S>
-constexpr void test_truncating(size_t o, size_t N) {
+constexpr void test_truncating(std::size_t o, size_t N) {
   assert(N < o);
   auto s = S(o, 'a');
   s.resize_and_overwrite(N, [&](auto* p, auto n) {
@@ -76,10 +76,10 @@
 
 void test_value_categories() {
   std::string s;
-  s.resize_and_overwrite(10, [](char*&&, size_t&&) { return 0; });
-  s.resize_and_overwrite(10, [](char* const&, const size_t&) { return 0; });
+  s.resize_and_overwrite(10, [](char*&&, std::size_t&&) { return 0; });
+  s.resize_and_overwrite(10, [](char* const&, const std::size_t&) { return 0; });
   struct RefQualified {
-    int operator()(char*, size_t) && { return 0; }
+    int operator()(char*, std::size_t) && { return 0; }
   };
   s.resize_and_overwrite(10, RefQualified{});
 }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.explicit_instantiation.sh.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.explicit_instantiation.sh.cpp
index 195491f..9f0f2ed 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.explicit_instantiation.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.explicit_instantiation.sh.cpp
@@ -34,12 +34,12 @@
   static void assign(char_type&, const char_type&) { }
   static bool eq(const char_type&, const char_type&) { return false; }
   static bool lt(const char_type&, const char_type&) { return false; }
-  static int compare(const char_type*, const char_type*, size_t) { return 0; }
-  static size_t length(const char_type*) { return 0; }
-  static const char_type* find(const char_type*, size_t, const char_type&) { return nullptr; }
-  static char_type* move(char_type*, const char_type*, size_t) { return nullptr; }
-  static char_type* copy(char_type*, const char_type*, size_t) { return nullptr; }
-  static char_type* assign(char_type*, size_t, char_type) { return nullptr; }
+  static int compare(const char_type*, const char_type*, std::size_t) { return 0; }
+  static std::size_t length(const char_type*) { return 0; }
+  static const char_type* find(const char_type*, std::size_t, const char_type&) { return nullptr; }
+  static char_type* move(char_type*, const char_type*, std::size_t) { return nullptr; }
+  static char_type* copy(char_type*, const char_type*, std::size_t) { return nullptr; }
+  static char_type* assign(char_type*, std::size_t, char_type) { return nullptr; }
   static int_type not_eof(const int_type&) { return 0; }
   static char_type to_char_type(const int_type&) { return char_type(); }
   static int_type to_int_type(const char_type&) { return int_type(); }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
index 07e9a60..92d6531 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
@@ -23,7 +23,7 @@
 {
     typedef T value_type;
     throwing_alloc(const throwing_alloc&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
     ~throwing_alloc() noexcept(false);
 };
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
index f9cdeac..5f3064b 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
@@ -81,7 +81,7 @@
   }
   { // Testing (4) w/o allocator
     const std::string sin("abc");
-    std::basic_string s(sin, (size_t)1);
+    std::basic_string s(sin, (std::size_t)1);
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "bc");
 
@@ -97,7 +97,7 @@
   }
   { // Testing (4) w/ allocator
     const std::string sin("abc");
-    std::basic_string s(sin, (size_t)1, std::allocator<char>{});
+    std::basic_string s(sin, (std::size_t)1, std::allocator<char>{});
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "bc");
 
@@ -113,7 +113,7 @@
   }
   { // Testing (5) w/o allocator
     const std::string sin("abc");
-    std::basic_string s(sin, (size_t)1, (size_t)3);
+    std::basic_string s(sin, (std::size_t)1, (size_t)3);
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "bc");
 
@@ -129,7 +129,7 @@
   }
   { // Testing (5) w/ allocator
     const std::string sin("abc");
-    std::basic_string s(sin, (size_t)1, (size_t)3, std::allocator<char>{});
+    std::basic_string s(sin, (std::size_t)1, (size_t)3, std::allocator<char>{});
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "bc");
 
@@ -144,18 +144,18 @@
 #endif
   }
   { // Testing (6) w/o allocator
-    std::basic_string s("abc", (size_t)2);
+    std::basic_string s("abc", (std::size_t)2);
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "ab");
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
-    std::basic_string w(L"abcdef", (size_t)3);
+    std::basic_string w(L"abcdef", (std::size_t)3);
     ASSERT_SAME_TYPE(decltype(w), std::wstring);
     assert(w == L"abc");
 #endif
   }
   { // Testing (6) w/ allocator
-    std::basic_string s("abc", (size_t)2, std::allocator<char>{});
+    std::basic_string s("abc", (std::size_t)2, std::allocator<char>{});
     ASSERT_SAME_TYPE(decltype(s), std::string);
     assert(s == "ab");
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
index c2b97ec..1e24c20 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
@@ -31,7 +31,7 @@
 {
     typedef T value_type;
     some_alloc(const some_alloc&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
 };
 
 template <class T>
@@ -41,7 +41,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_move_assignment;
@@ -55,7 +55,7 @@
 
     some_alloc3() {}
     some_alloc3(const some_alloc3&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_move_assignment;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
index ebe4e49..6c5049f 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
@@ -17,25 +17,37 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "nasty_string.h"
+
+template <class S>
+TEST_CONSTEXPR_CXX20 void test() {
+  using CharT = typename S::value_type;
+
+  S s(CONVERT_TO_CSTRING(CharT, "123"));
+  s.append({CharT('a'), CharT('b'), CharT('c')});
+  assert(s == CONVERT_TO_CSTRING(CharT, "123abc"));
+}
 
 TEST_CONSTEXPR_CXX20 bool test() {
-  {
-    std::string s("123");
-    s.append({'a', 'b', 'c'});
-    assert(s == "123abc");
-  }
-  {
-    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
-    S s("123");
-    s.append({'a', 'b', 'c'});
-    assert(s == "123abc");
-  }
+  test<std::string>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<std::wstring>();
+#endif
+#if TEST_STD_VER >= 20
+  test<std::u8string>();
+#endif
+  test<std::u16string>();
+  test<std::u32string>();
+
+  test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+#ifndef TEST_HAS_NO_NASTY_STRING
+  test<nasty_string>();
+#endif
 
   return true;
 }
 
-int main(int, char**)
-{
+int main(int, char**) {
   test();
 #if TEST_STD_VER > 17
   static_assert(test());
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
index 83b8d8a..cf74053 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
@@ -154,7 +154,7 @@
 
   { // test appending a different type
     typedef std::string S;
-    const uint8_t p[] = "ABCD";
+    const std::uint8_t p[] = "ABCD";
 
     S s;
     s.append(p, p + 4);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
index 7d9cf9a..809ed97 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
@@ -35,15 +35,15 @@
     static bool eq(char_type c1, char_type c2);
     static bool lt(char_type c1, char_type c2);
 
-    static int compare(const char_type* s1, const char_type* s2, size_t n);
-    static size_t length(const char_type* s);
-    static const char_type* find(const char_type* s, size_t n, const char_type& a);
-    static char_type* move(char_type* s1, const char_type* s2, size_t n);
-    static TEST_CONSTEXPR_CXX20 char_type* copy(char_type* s1, const char_type* s2, size_t n) {
+    static int compare(const char_type* s1, const char_type* s2, std::size_t n);
+    static std::size_t length(const char_type* s);
+    static const char_type* find(const char_type* s, std::size_t n, const char_type& a);
+    static char_type* move(char_type* s1, const char_type* s2, std::size_t n);
+    static TEST_CONSTEXPR_CXX20 char_type* copy(char_type* s1, const char_type* s2, std::size_t n) {
       std::copy_n(s2, n, s1);
       return s1;
     }
-    static TEST_CONSTEXPR_CXX20 char_type* assign(char_type* s, size_t n, char_type a) {
+    static TEST_CONSTEXPR_CXX20 char_type* assign(char_type* s, std::size_t n, char_type a) {
       std::fill_n(s, n, a);
       return s;
     }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
index 3b8d0dc..9af2f12 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
@@ -155,7 +155,7 @@
 
   { // test assigning a different type
     typedef std::string S;
-    const uint8_t p[] = "ABCD";
+    const std::uint8_t p[] = "ABCD";
 
     S s;
     s.assign(p, p + 4);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
index c0822d4..9950374 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
@@ -15,91 +15,89 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "nasty_string.h"
 #include "min_allocator.h"
 #include "test_allocator.h"
 
 template <class S>
-TEST_CONSTEXPR_CXX20 void
-test(S s, S str, S expected)
-{
-    s.assign(str);
-    LIBCPP_ASSERT(s.__invariants());
-    assert(s == expected);
+TEST_CONSTEXPR_CXX20 void test(S dest, S src) {
+  dest.assign(src);
+  LIBCPP_ASSERT(dest.__invariants());
+  assert(dest == src);
 }
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
-testAlloc(S s, S str, const typename S::allocator_type& a)
+testAlloc(S dest, S src, const typename S::allocator_type& a)
 {
-    s.assign(str);
-    LIBCPP_ASSERT(s.__invariants());
-    assert(s == str);
-    assert(s.get_allocator() == a);
+    dest.assign(src);
+    LIBCPP_ASSERT(dest.__invariants());
+    assert(dest == src);
+    assert(dest.get_allocator() == a);
+}
+
+template <class S>
+TEST_CONSTEXPR_CXX20 void test_assign() {
+    using CharT = typename S::value_type;
+
+    test(S(), S());
+    test(S(), S(CONVERT_TO_CSTRING(CharT, "12345")));
+    test(S(), S(CONVERT_TO_CSTRING(CharT, "1234567890")));
+    test(S(), S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")));
+
+    test(S(CONVERT_TO_CSTRING(CharT, "12345")), S());
+    test(S(CONVERT_TO_CSTRING(CharT, "12345")), S(CONVERT_TO_CSTRING(CharT, "12345")));
+    test(S(CONVERT_TO_CSTRING(CharT, "12345")), S(CONVERT_TO_CSTRING(CharT, "1234567890")));
+    test(S(CONVERT_TO_CSTRING(CharT, "12345")), S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")));
+
+    test(S(CONVERT_TO_CSTRING(CharT, "1234567890")), S());
+    test(S(CONVERT_TO_CSTRING(CharT, "1234567890")), S(CONVERT_TO_CSTRING(CharT, "12345")));
+    test(S(CONVERT_TO_CSTRING(CharT, "1234567890")), S(CONVERT_TO_CSTRING(CharT, "1234567890")));
+    test(S(CONVERT_TO_CSTRING(CharT, "1234567890")), S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")));
+
+    test(S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")), S());
+    test(S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")), S(CONVERT_TO_CSTRING(CharT, "12345")));
+    test(S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")), S(CONVERT_TO_CSTRING(CharT, "1234567890")));
+    test(S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")), S(CONVERT_TO_CSTRING(CharT, "12345678901234567890")));
 }
 
 TEST_CONSTEXPR_CXX20 bool test() {
-  {
-    typedef std::string S;
-    test(S(), S(), S());
-    test(S(), S("12345"), S("12345"));
-    test(S(), S("1234567890"), S("1234567890"));
-    test(S(), S("12345678901234567890"), S("12345678901234567890"));
+    test_assign<std::string>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+    test_assign<std::wstring>();
+#endif
+#if TEST_STD_VER >= 20
+    test_assign<std::u8string>();
+#endif
+#if TEST_STD_VER >= 11
+    test_assign<std::u16string>();
+    test_assign<std::u32string>();
+#endif
+#ifndef TEST_HAS_NO_NASTY_STRING
+    test_assign<nasty_string>();
+#endif
 
-    test(S("12345"), S(), S());
-    test(S("12345"), S("12345"), S("12345"));
-    test(S("12345"), S("1234567890"), S("1234567890"));
-    test(S("12345"), S("12345678901234567890"), S("12345678901234567890"));
+    {
+      typedef std::string S;
+      testAlloc(S(), S(), std::allocator<char>());
+      testAlloc(S(), S("12345"), std::allocator<char>());
+      testAlloc(S(), S("1234567890"), std::allocator<char>());
+      testAlloc(S(), S("12345678901234567890"), std::allocator<char>());
+    }
 
-    test(S("1234567890"), S(), S());
-    test(S("1234567890"), S("12345"), S("12345"));
-    test(S("1234567890"), S("1234567890"), S("1234567890"));
-    test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890"));
-
-    test(S("12345678901234567890"), S(), S());
-    test(S("12345678901234567890"), S("12345"), S("12345"));
-    test(S("12345678901234567890"), S("1234567890"), S("1234567890"));
-    test(S("12345678901234567890"), S("12345678901234567890"),
-         S("12345678901234567890"));
-
-    testAlloc(S(), S(), std::allocator<char>());
-    testAlloc(S(), S("12345"), std::allocator<char>());
-    testAlloc(S(), S("1234567890"), std::allocator<char>());
-    testAlloc(S(), S("12345678901234567890"), std::allocator<char>());
-  }
-
-  { //  LWG#5579 make sure assign takes the allocators where appropriate
-    typedef other_allocator<char> A;  // has POCCA --> true
-    typedef std::basic_string<char, std::char_traits<char>, A> S;
-    testAlloc(S(A(5)), S(A(3)), A(3));
-    testAlloc(S(A(5)), S("1"), A());
-    testAlloc(S(A(5)), S("1", A(7)), A(7));
-    testAlloc(S(A(5)), S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), A(7));
-  }
+    {                                  //  LWG#5579 make sure assign takes the allocators where appropriate
+      typedef other_allocator<char> A; // has POCCA --> true
+      typedef std::basic_string<char, std::char_traits<char>, A> S;
+      testAlloc(S(A(5)), S(A(3)), A(3));
+      testAlloc(S(A(5)), S("1"), A());
+      testAlloc(S(A(5)), S("1", A(7)), A(7));
+      testAlloc(S(A(5)), S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)), A(7));
+    }
 
 #if TEST_STD_VER >= 11
   {
     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
-    test(S(), S(), S());
-    test(S(), S("12345"), S("12345"));
-    test(S(), S("1234567890"), S("1234567890"));
-    test(S(), S("12345678901234567890"), S("12345678901234567890"));
-
-    test(S("12345"), S(), S());
-    test(S("12345"), S("12345"), S("12345"));
-    test(S("12345"), S("1234567890"), S("1234567890"));
-    test(S("12345"), S("12345678901234567890"), S("12345678901234567890"));
-
-    test(S("1234567890"), S(), S());
-    test(S("1234567890"), S("12345"), S("12345"));
-    test(S("1234567890"), S("1234567890"), S("1234567890"));
-    test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890"));
-
-    test(S("12345678901234567890"), S(), S());
-    test(S("12345678901234567890"), S("12345"), S("12345"));
-    test(S("12345678901234567890"), S("1234567890"), S("1234567890"));
-    test(S("12345678901234567890"), S("12345678901234567890"),
-         S("12345678901234567890"));
-
+    test_assign<S>();
     testAlloc(S(), S(), min_allocator<char>());
     testAlloc(S(), S("12345"), min_allocator<char>());
     testAlloc(S(), S("1234567890"), min_allocator<char>());
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
index fb32892..d7f3ca3 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
@@ -145,7 +145,7 @@
 
   { // test assigning a different type
     typedef std::string S;
-    const uint8_t p[] = "ABCD";
+    const std::uint8_t p[] = "ABCD";
 
     S s;
     s.insert(s.begin(), p, p + 4);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
index 5a1282c..c70a43e 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
@@ -1028,8 +1028,8 @@
   }
 
   { // test assigning a different type
-    const uint8_t pc[] = "ABCD";
-    uint8_t        p[] = "EFGH";
+    const std::uint8_t pc[] = "ABCD";
+    std::uint8_t        p[] = "EFGH";
 
     S s;
     s.replace(s.begin(), s.end(), pc, pc + 4);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.cmp/comparison.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.cmp/comparison.pass.cpp
index d9f71bd..03b3b98 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.cmp/comparison.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.cmp/comparison.pass.cpp
@@ -59,8 +59,8 @@
   };
   static_assert(v.size() == vn.size());
 
-  for (size_t i = 0; i < v.size(); ++i) {
-    for (size_t j = 0; j < v.size(); ++j) {
+  for (std::size_t i = 0; i < v.size(); ++i) {
+    for (std::size_t j = 0; j < v.size(); ++j) {
       assert(testOrder(v[i], v[j], i == j ? Ordering::equivalent : i < j ? Ordering::less : Ordering::greater));
 
       assert(testOrder(
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
index de82002..9a5513b 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
@@ -34,7 +34,7 @@
 
     some_alloc() {}
     some_alloc(const some_alloc&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
     void deallocate(void*, unsigned) {}
     typedef std::true_type propagate_on_container_swap;
 };
@@ -46,7 +46,7 @@
 
     some_alloc2() {}
     some_alloc2(const some_alloc2&);
-    T *allocate(size_t);
+    T *allocate(std::size_t);
     void deallocate(void*, unsigned) {}
 
     typedef std::false_type propagate_on_container_swap;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
index f7087fd..822f1a6 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
@@ -21,7 +21,7 @@
 template <class C>
 TEST_CONSTEXPR_CXX20 void test_contiguous ( const C &c )
 {
-    for ( size_t i = 0; i < c.size(); ++i )
+    for ( std::size_t i = 0; i < c.size(); ++i )
         assert ( *(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/c.strings/cuchar.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/c.strings/cuchar.compile.pass.cpp
index 909f2c0..db00cbd 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/c.strings/cuchar.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/c.strings/cuchar.compile.pass.cpp
@@ -11,9 +11,6 @@
 // Apple platforms don't provide <uchar.h> yet, so these tests fail.
 // XFAIL: target={{.+}}-apple-{{.+}}
 
-// The system-provided <uchar.h> seems to be broken on AIX
-// XFAIL: LIBCXX-AIX-FIXME
-
 // <cuchar>
 
 #include <cuchar>
@@ -24,12 +21,12 @@
 // __STDC_UTF_32__ may or may not be defined by the C standard library
 
 #if !defined(TEST_HAS_NO_C8RTOMB_MBRTOC8)
-ASSERT_SAME_TYPE(size_t, decltype(std::mbrtoc8((char8_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
-ASSERT_SAME_TYPE(size_t, decltype(std::c8rtomb((char*)0, (char8_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::mbrtoc8((char8_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::c8rtomb((char*)0, (char8_t)0, (mbstate_t*)0)));
 #endif
 
-ASSERT_SAME_TYPE(size_t, decltype(std::mbrtoc16((char16_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
-ASSERT_SAME_TYPE(size_t, decltype(std::c16rtomb((char*)0, (char16_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::mbrtoc16((char16_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::c16rtomb((char*)0, (char16_t)0, (mbstate_t*)0)));
 
-ASSERT_SAME_TYPE(size_t, decltype(std::mbrtoc32((char32_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
-ASSERT_SAME_TYPE(size_t, decltype(std::c16rtomb((char*)0, (char32_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::mbrtoc32((char32_t*)0, (const char*)0, (size_t)0, (mbstate_t*)0)));
+ASSERT_SAME_TYPE(std::size_t, decltype(std::c16rtomb((char*)0, (char32_t)0, (mbstate_t*)0)));
diff --git a/third_party/llvm-project/libcxx/test/std/strings/c.strings/no_c8rtomb_mbrtoc8.verify.cpp b/third_party/llvm-project/libcxx/test/std/strings/c.strings/no_c8rtomb_mbrtoc8.verify.cpp
index f39aef4..bc058d4 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/c.strings/no_c8rtomb_mbrtoc8.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/c.strings/no_c8rtomb_mbrtoc8.verify.cpp
@@ -8,20 +8,23 @@
 
 // UNSUPPORTED: c++03
 
-// The system-provided <uchar.h> seems to be broken on AIX:
-//   error: 'error' diagnostics seen but not expected:
-//     File /usr/include/uchar.h Line 38: cannot combine with previous 'type-name' declaration specifier
-//     File /usr/include/uchar.h Line 39: cannot combine with previous 'type-name' declaration specifier
-//   2 errors generated.
-// XFAIL: LIBCXX-AIX-FIXME
-
 #include <uchar.h>
 
+#include "test_macros.h"
+
+// When C++ char8_t support is not enabled, definitions of these functions that
+// match the C2X declarations may still be present in the global namespace with
+// a char8_t typedef substituted for the C++ char8_t type. If so, these are not
+// the declarations we are looking for, so don't test for them.
+#if !defined(TEST_HAS_NO_CHAR8_T)
 using U = decltype(::c8rtomb);
 using V = decltype(::mbrtoc8);
-#if defined(_LIBCPP_HAS_NO_C8RTOMB_MBRTOC8)
+#  if defined(_LIBCPP_HAS_NO_C8RTOMB_MBRTOC8)
 // expected-error@-3 {{no member named 'c8rtomb' in the global namespace}}
 // expected-error@-3 {{no member named 'mbrtoc8' in the global namespace}}
+#  else
+// expected-no-diagnostics
+#  endif
 #else
 // expected-no-diagnostics
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stod.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stod.pass.cpp
index bc553ad..dbf10a4 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stod.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stod.pass.cpp
@@ -27,29 +27,29 @@
         assert(std::stod("-10") == -10);
         assert(std::stod(" 10") == 10);
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod("10g", &idx) == 10);
             assert(idx == 2);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod("1.e60", &idx) == 1.e60);
             assert(idx == 5);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod("INF", &idx) == INFINITY);
             assert(idx == 3);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::isnan(std::stod("NAN", &idx)));
             assert(idx == 3);
         }
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 assert(std::stod("1.e360", &idx) == INFINITY);
                 assert(false);
@@ -58,7 +58,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod("", &idx);
                 assert(false);
@@ -67,7 +67,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod("  - 8", &idx);
                 assert(false);
@@ -76,7 +76,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod("a1", &idx);
                 assert(false);
@@ -95,28 +95,28 @@
         assert(std::stod(L"-10.5") == -10.5);
         assert(std::stod(L" 10") == 10);
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod(L"10g", &idx) == 10);
             assert(idx == 2);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod(L"1.e60", &idx) == 1.e60);
             assert(idx == 5);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::stod(L"INF", &idx) == INFINITY);
             assert(idx == 3);
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             assert(std::isnan(std::stod(L"NAN", &idx)));
             assert(idx == 3);
         }
 #ifndef TEST_HAS_NO_EXCEPTIONS
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 assert(std::stod(L"1.e360", &idx) == INFINITY);
                 assert(false);
@@ -125,7 +125,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod(L"", &idx);
                 assert(false);
@@ -134,7 +134,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod(L"  - 8", &idx);
                 assert(false);
@@ -143,7 +143,7 @@
             }
         }
         {
-            size_t idx = 0;
+            std::size_t idx = 0;
             try {
                 (void)std::stod(L"a1", &idx);
                 assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stof.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stof.pass.cpp
index da4bddd..d95e5d1 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stof.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stof.pass.cpp
@@ -25,23 +25,23 @@
     assert(std::stof("-10") == -10);
     assert(std::stof(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stof("10g", &idx) == 10);
         assert(idx == 2);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stof("INF", &idx) == INFINITY);
         assert(idx == 3);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::isnan(std::stof("NAN", &idx)));
         assert(idx == 3);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stof("1.e60", &idx) == INFINITY);
             assert(false);
@@ -50,7 +50,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stof("1.e360", &idx) == INFINITY);
             assert(false);
@@ -59,7 +59,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof("", &idx);
             assert(false);
@@ -68,7 +68,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof("  - 8", &idx);
             assert(false);
@@ -77,7 +77,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof("a1", &idx);
             assert(false);
@@ -93,23 +93,23 @@
     assert(std::stof(L"-10.5") == -10.5);
     assert(std::stof(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stof(L"10g", &idx) == 10);
         assert(idx == 2);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stof(L"INF", &idx) == INFINITY);
         assert(idx == 3);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::isnan(std::stof(L"NAN", &idx)));
         assert(idx == 3);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stof(L"1.e60", &idx) == INFINITY);
             assert(false);
@@ -118,7 +118,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stof(L"1.e360", &idx) == INFINITY);
             assert(false);
@@ -127,7 +127,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof(L"", &idx);
             assert(false);
@@ -136,7 +136,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof(L"  - 8", &idx);
             assert(false);
@@ -145,7 +145,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stof(L"a1", &idx);
             assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoi.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoi.pass.cpp
index 8a8ea64..f7650e3 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoi.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoi.pass.cpp
@@ -24,13 +24,13 @@
     assert(std::stoi("-10") == -10);
     assert(std::stoi(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoi("10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     if (std::numeric_limits<long>::max() > std::numeric_limits<int>::max()) {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi("0x100000000", &idx, 16);
             assert(false);
@@ -39,7 +39,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi("", &idx);
             assert(false);
@@ -48,7 +48,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi("  - 8", &idx);
             assert(false);
@@ -57,7 +57,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi("a1", &idx);
             assert(false);
@@ -73,13 +73,13 @@
     assert(std::stoi(L"-10") == -10);
     assert(std::stoi(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoi(L"10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     if (std::numeric_limits<long>::max() > std::numeric_limits<int>::max()) {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi(L"0x100000000", &idx, 16);
             assert(false);
@@ -88,7 +88,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi(L"", &idx);
             assert(false);
@@ -97,7 +97,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi(L"  - 8", &idx);
             assert(false);
@@ -106,7 +106,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoi(L"a1", &idx);
             assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stol.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stol.pass.cpp
index 3f37693..2356ae8 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stol.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stol.pass.cpp
@@ -24,13 +24,13 @@
     assert(std::stol("-10") == -10);
     assert(std::stol(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stol("10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol("", &idx);
             assert(false);
@@ -39,7 +39,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol("  - 8", &idx);
             assert(false);
@@ -48,7 +48,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol("a1", &idx);
             assert(false);
@@ -57,7 +57,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stol("9999999999999999999999999999999999999999999999999", &idx);
@@ -74,13 +74,13 @@
     assert(std::stol(L"-10") == -10);
     assert(std::stol(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stol(L"10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol(L"", &idx);
             assert(false);
@@ -89,7 +89,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol(L"  - 8", &idx);
             assert(false);
@@ -98,7 +98,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stol(L"a1", &idx);
             assert(false);
@@ -107,7 +107,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stol(L"9999999999999999999999999999999999999999999999999", &idx);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stold.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stold.pass.cpp
index abe8842..dc9d3c6 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stold.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stold.pass.cpp
@@ -25,29 +25,29 @@
     assert(std::stold("-10") == -10);
     assert(std::stold(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold("10g", &idx) == 10);
         assert(idx == 2);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold("1.e60", &idx) == 1.e60L);
         assert(idx == 5);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold("INF", &idx) == INFINITY);
         assert(idx == 3);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::isnan(std::stold("NAN", &idx)));
         assert(idx == 3);
     }
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold("", &idx);
             assert(false);
@@ -56,7 +56,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold("  - 8", &idx);
             assert(false);
@@ -65,7 +65,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold("a1", &idx);
             assert(false);
@@ -74,7 +74,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stold("1.e6000", &idx) == INFINITY);
             assert(false);
@@ -90,28 +90,28 @@
     assert(std::stold(L"-10.5") == -10.5);
     assert(std::stold(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold(L"10g", &idx) == 10);
         assert(idx == 2);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold(L"1.e60", &idx) == 1.e60L);
         assert(idx == 5);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stold(L"INF", &idx) == INFINITY);
         assert(idx == 3);
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::isnan(std::stold(L"NAN", &idx)));
         assert(idx == 3);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold(L"", &idx);
             assert(false);
@@ -120,7 +120,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold(L"  - 8", &idx);
             assert(false);
@@ -129,7 +129,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stold(L"a1", &idx);
             assert(false);
@@ -138,7 +138,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             assert(std::stold(L"1.e6000", &idx) == INFINITY);
             assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoll.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoll.pass.cpp
index b8eb1b5..fc6bd13 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoll.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoll.pass.cpp
@@ -24,13 +24,13 @@
     assert(std::stoll("-10") == -10);
     assert(std::stoll(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoll("10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll("", &idx);
             assert(false);
@@ -39,7 +39,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll("  - 8", &idx);
             assert(false);
@@ -48,7 +48,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll("a1", &idx);
             assert(false);
@@ -57,7 +57,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoll("99999999999999999999999999", &idx);
@@ -74,13 +74,13 @@
     assert(std::stoll(L"-10") == -10);
     assert(std::stoll(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoll(L"10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll(L"", &idx);
             assert(false);
@@ -89,7 +89,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll(L"  - 8", &idx);
             assert(false);
@@ -98,7 +98,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoll(L"a1", &idx);
             assert(false);
@@ -107,7 +107,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoll(L"99999999999999999999999999", &idx);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoul.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoul.pass.cpp
index b84891e..a8d23f9 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoul.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoul.pass.cpp
@@ -23,13 +23,13 @@
     assert(std::stoul("-0") == 0);
     assert(std::stoul(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoul("10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul("", &idx);
             assert(false);
@@ -38,7 +38,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul("  - 8", &idx);
             assert(false);
@@ -47,7 +47,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul("a1", &idx);
             assert(false);
@@ -56,7 +56,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoul("9999999999999999999999999999999999999999999999999", &idx);
@@ -72,13 +72,13 @@
     assert(std::stoul(L"-0") == 0);
     assert(std::stoul(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoul(L"10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul(L"", &idx);
             assert(false);
@@ -87,7 +87,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul(L"  - 8", &idx);
             assert(false);
@@ -96,7 +96,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoul(L"a1", &idx);
             assert(false);
@@ -105,7 +105,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoul(L"9999999999999999999999999999999999999999999999999", &idx);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoull.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoull.pass.cpp
index 744dcab..2757cea 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoull.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.conversions/stoull.pass.cpp
@@ -23,13 +23,13 @@
     assert(std::stoull("-0") == 0);
     assert(std::stoull(" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoull("10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull("", &idx);
             assert(false);
@@ -38,7 +38,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull("  - 8", &idx);
             assert(false);
@@ -47,7 +47,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull("a1", &idx);
             assert(false);
@@ -56,7 +56,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoull("9999999999999999999999999999999999999999999999999", &idx);
@@ -72,13 +72,13 @@
     assert(std::stoull(L"-0") == 0);
     assert(std::stoull(L" 10") == 10);
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         assert(std::stoull(L"10g", &idx, 16) == 16);
         assert(idx == 2);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull(L"", &idx);
             assert(false);
@@ -87,7 +87,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull(L"  - 8", &idx);
             assert(false);
@@ -96,7 +96,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             (void)std::stoull(L"a1", &idx);
             assert(false);
@@ -105,7 +105,7 @@
         }
     }
     {
-        size_t idx = 0;
+        std::size_t idx = 0;
         try {
             // LWG#2009 and PR14919
             (void)std::stoull(L"9999999999999999999999999999999999999999999999999", &idx);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/at.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/at.pass.cpp
index 99a81ac..c010174 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/at.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/at.pass.cpp
@@ -17,10 +17,10 @@
 #include "test_macros.h"
 
 template <typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     std::basic_string_view<CharT> sv ( s, len );
     assert ( sv.length() == len );
-    for ( size_t i = 0; i < len; ++i ) {
+    for ( std::size_t i = 0; i < len; ++i ) {
         assert (  sv.at(i) == s[i] );
         assert ( &sv.at(i) == s + i );
     }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/back.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/back.pass.cpp
index 49b84ab..e63b80d 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/back.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/back.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_macros.h"
 
 template <typename CharT>
-bool test ( const CharT *s, size_t len ) {
+bool test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     SV sv ( s, len );
     ASSERT_SAME_TYPE(decltype(sv.back()), typename SV::const_reference);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/data.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/data.pass.cpp
index 50d2a14..bf5485b 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/data.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/data.pass.cpp
@@ -19,7 +19,7 @@
 #include "test_macros.h"
 
 template <typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     std::basic_string_view<CharT> sv ( s, len );
     assert ( sv.length() == len );
     assert ( sv.data() == s );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/front.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/front.pass.cpp
index d9e1607..72aa025 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/front.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/front.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_macros.h"
 
 template <typename CharT>
-bool test ( const CharT *s, size_t len ) {
+bool test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     SV sv ( s, len );
     ASSERT_SAME_TYPE(decltype(sv.front()), typename SV::const_reference);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/index.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/index.pass.cpp
index b27bc65..51c60ec 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/index.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.access/index.pass.cpp
@@ -18,13 +18,13 @@
 #include "test_macros.h"
 
 template <typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     SV sv ( s, len );
     ASSERT_SAME_TYPE(decltype(sv[0]), typename SV::const_reference);
     LIBCPP_ASSERT_NOEXCEPT(   sv[0]);
     assert ( sv.length() == len );
-    for ( size_t i = 0; i < len; ++i ) {
+    for ( std::size_t i = 0; i < len; ++i ) {
         assert ( sv[i] == s[i] );
         assert ( &sv[i] == s + i );
         }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
index 2e11aa1..a9fd862 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
@@ -59,7 +59,7 @@
 }
 
 template<typename CharT>
-void test2 ( const CharT *s, size_t len ) {
+void test2 ( const CharT *s, std::size_t len ) {
     {
     std::basic_string_view<CharT> sv1 ( s );
     assert ( sv1.size() == len );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/empty.verify.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/empty.verify.cpp
index 9e6af24..73e0af7 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/empty.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.capacity/empty.verify.cpp
@@ -16,12 +16,7 @@
 
 #include <string_view>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::string_view c;
     c.empty();  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/common_type_specialization.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/common_type_specialization.pass.cpp
index 248ef56..ef120cb 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/common_type_specialization.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/common_type_specialization.pass.cpp
@@ -32,7 +32,7 @@
 
   static bool eq(char_wrapper lhs, char_wrapper rhs) { return lhs.c == rhs.c; }
 
-  static size_t length(const char_wrapper* a) {
+  static std::size_t length(const char_wrapper* a) {
     static_assert(sizeof(char_wrapper) == 1, "strlen requires this");
     return std::strlen(reinterpret_cast<const char*>(a));
   }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.pass.cpp
index 120b9a0..bf4ebd9 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.pass.cpp
@@ -47,7 +47,7 @@
   static constexpr void assign(char_type& __c1, const char_type& __c2) noexcept { __c1 = __c2; }
   static constexpr bool eq(char_type __c1, char_type __c2) noexcept { return __c1 == __c2; }
   static constexpr bool lt(char_type __c1, char_type __c2) noexcept { return __c1 < __c2; }
-  static constexpr int compare(const char_type* __s1, const char_type* __s2, size_t __n) {
+  static constexpr int compare(const char_type* __s1, const char_type* __s2, std::size_t __n) {
     for (; __n; --__n, ++__s1, ++__s2) {
       if (lt(*__s1, *__s2))
         return -1;
@@ -57,11 +57,11 @@
     return 0;
   }
 
-  static constexpr size_t length(const char_type* __s);
-  static constexpr const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
-  static constexpr char_type* move(char_type* __s1, const char_type* __s2, size_t __n);
-  static constexpr char_type* copy(char_type* __s1, const char_type* __s2, size_t __n);
-  static constexpr char_type* assign(char_type* __s, size_t __n, char_type __a);
+  static constexpr std::size_t length(const char_type* __s);
+  static constexpr const char_type* find(const char_type* __s, std::size_t __n, const char_type& __a);
+  static constexpr char_type* move(char_type* __s1, const char_type* __s2, std::size_t __n);
+  static constexpr char_type* copy(char_type* __s1, const char_type* __s2, std::size_t __n);
+  static constexpr char_type* assign(char_type* __s, std::size_t __n, char_type __a);
   static constexpr int_type not_eof(int_type __c) noexcept { return eq_int_type(__c, eof()) ? ~eof() : __c; }
   static constexpr char_type to_char_type(int_type __c) noexcept { return char_type(__c); }
   static constexpr int_type to_int_type(char_type __c) noexcept { return int_type(__c); }
@@ -91,8 +91,8 @@
   };
   static_assert(v.size() == vn.size());
 
-  for (size_t i = 0; i < v.size(); ++i) {
-    for (size_t j = 0; j < v.size(); ++j) {
+  for (std::size_t i = 0; i < v.size(); ++i) {
+    for (std::size_t j = 0; j < v.size(); ++j) {
       assert(testOrder(v[i], v[j], i == j ? Ordering::equivalent : i < j ? Ordering::less : Ordering::greater));
       assert(testOrder(
           v[i],
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.verify.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.verify.cpp
index 09bd1bd..a2c58c3 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.comparison/comparison.verify.cpp
@@ -34,12 +34,12 @@
   static constexpr bool eq(char_type&, const char_type&) noexcept;
   static constexpr bool lt(char_type&, const char_type&) noexcept;
 
-  static constexpr int compare(const char_type*, const char_type*, size_t) { return 0; }
-  static constexpr size_t length(const char_type*);
-  static constexpr const char_type* find(const char_type*, size_t, const char_type&);
-  static constexpr char_type* move(char_type*, const char_type*, size_t);
-  static constexpr char_type* copy(char_type*, const char_type*, size_t);
-  static constexpr char_type* assign(char_type*, size_t, char_type);
+  static constexpr int compare(const char_type*, const char_type*, std::size_t) { return 0; }
+  static constexpr std::size_t length(const char_type*);
+  static constexpr const char_type* find(const char_type*, std::size_t, const char_type&);
+  static constexpr char_type* move(char_type*, const char_type*, std::size_t);
+  static constexpr char_type* copy(char_type*, const char_type*, std::size_t);
+  static constexpr char_type* assign(char_type*, std::size_t, char_type);
 
   static constexpr int_type not_eof(int_type) noexcept;
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
index 124aaea..2f1e478 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
@@ -22,7 +22,7 @@
 
 template<typename CharT>
 size_t StrLen ( const CharT *s ) {
-    size_t retVal = 0;
+    std::size_t retVal = 0;
     while ( *s != 0 ) { ++retVal; ++s; }
     return retVal;
     }
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
index 8d48f90..8ff6061 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
@@ -20,7 +20,7 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test ( const CharT *s, size_t sz ) {
+void test ( const CharT *s, std::size_t sz ) {
     {
     typedef std::basic_string_view<CharT> SV;
     LIBCPP_ASSERT_NOEXCEPT(SV(s, sz));
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_range.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_range.pass.cpp
index a645827..bf24d53 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_range.pass.cpp
@@ -20,7 +20,6 @@
 #include <type_traits>
 #include <vector>
 
-#include "constexpr_char_traits.h"
 #include "make_string.h"
 #include "test_iterators.h"
 #include "test_range.h"
@@ -107,6 +106,15 @@
     assert(sv == "test");
   }
 
+  // Different trait types
+  {
+    struct OtherTraits : std::char_traits<char> {};
+    std::basic_string_view<char> sv1{"hello"};
+    std::basic_string_view<char, OtherTraits> sv2(sv1);
+    assert(sv1.size() == sv2.size());
+    assert(sv1.data() == sv2.data());
+  }
+
   return true;
 }
 
@@ -135,25 +143,7 @@
 
 static_assert(std::is_constructible_v<std::string_view, WithStringViewConversionOperator>); // lvalue
 static_assert(std::is_constructible_v<std::string_view, const WithStringViewConversionOperator&>); // const lvalue
-static_assert(std::is_constructible_v<std::string_view, WithStringViewConversionOperator&&>); // rvalue
-
-template <class CharTraits>
-struct WithTraitsType {
-  typename CharTraits::char_type* begin() const;
-  typename CharTraits::char_type* end() const;
-  using traits_type = CharTraits;
-};
-
-using CCT = constexpr_char_traits<char>;
-static_assert(std::is_constructible_v<std::string_view, WithTraitsType<std::char_traits<char>>>);
-#ifndef TEST_HAS_NO_WIDE_CHARACTERS
-static_assert(std::is_constructible_v<std::wstring_view, WithTraitsType<std::char_traits<wchar_t>>>);
-#endif
-static_assert(std::is_constructible_v<std::basic_string_view<char, CCT>, WithTraitsType<CCT>>);
-static_assert(!std::is_constructible_v<std::string_view, WithTraitsType<CCT>>);  // wrong traits type
-#ifndef TEST_HAS_NO_WIDE_CHARACTERS
-static_assert(!std::is_constructible_v<std::wstring_view, WithTraitsType<std::char_traits<char>>>);  // wrong traits type
-#endif
+static_assert(std::is_constructible_v<std::string_view, WithStringViewConversionOperator&&>);      // rvalue
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
 void test_throwing() {
@@ -173,7 +163,7 @@
   struct ThrowingSize {
     char* begin() const { return nullptr; }
     char* end() const { return nullptr; }
-    size_t size() const { throw 42; return 0; }
+    std::size_t size() const { throw 42; return 0; }
   };
   try {
     ThrowingSize x;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string1.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string1.compile.fail.cpp
deleted file mode 100644
index e4cf136..0000000
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string1.compile.fail.cpp
+++ /dev/null
@@ -1,34 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
-
-// <string_view>
-
-// template<class Allocator>
-// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
-
-#include <string_view>
-#include <string>
-#include <cassert>
-
-struct dummy_char_traits : public std::char_traits<char> {};
-
-int main(int, char**) {
-    using string_view = std::basic_string_view<char>;
-    using string      = std::              basic_string     <char, dummy_char_traits>;
-
-    {
-    string s{"QBCDE"};
-    string_view sv1 ( s );
-    assert ( sv1.size() == s.size());
-    assert ( sv1.data() == s.data());
-    }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string2.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string2.compile.fail.cpp
deleted file mode 100644
index 30540ee..0000000
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.cons/from_string2.compile.fail.cpp
+++ /dev/null
@@ -1,34 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
-
-// <string_view>
-
-// template<class Allocator>
-// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
-
-#include <string_view>
-#include <string>
-#include <cassert>
-
-struct dummy_char_traits : public std::char_traits<char> {};
-
-int main(int, char**) {
-    using string_view = std::basic_string_view<char, dummy_char_traits>;
-    using string      = std::              basic_string     <char>;
-
-    {
-    string s{"QBCDE"};
-    string_view sv1 ( s );
-    assert ( sv1.size() == s.size());
-    assert ( sv1.data() == s.data());
-    }
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/char_type.hash.fail.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/char_type.hash.fail.cpp
index a1d6c10..c81b61b 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/char_type.hash.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/char_type.hash.fail.cpp
@@ -33,14 +33,14 @@
     static inline bool eq(char_type __c1, char_type __c2) { return __c1 == __c2; }
     static inline bool lt(char_type __c1, char_type __c2) { return __c1 < __c2; }
 
-    static int compare(const char_type* __s1, const char_type* __s2, size_t __n);
-    static size_t length(const char_type* __s);
-    static const char_type* find(const char_type* __s, size_t __n,
+    static int compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
+    static std::size_t length(const char_type* __s);
+    static const char_type* find(const char_type* __s, std::size_t __n,
                                  const char_type& __a);
 
-    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n);
-    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n);
-    static char_type* assign(char_type* __s, size_t __n, char_type __a);
+    static char_type* move(char_type* __s1, const char_type* __s2, std::size_t __n);
+    static char_type* copy(char_type* __s1, const char_type* __s2, std::size_t __n);
+    static char_type* assign(char_type* __s, std::size_t __n, char_type __a);
 
     static inline int_type not_eof(int_type __c) {
         return eq_int_type(__c, eof()) ? ~eof() : __c;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
index 407823b..f0fffbd 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
@@ -36,12 +36,12 @@
   static bool eq(char_type, char_type);
   static bool lt(char_type, char_type);
 
-  static int              compare(const char_type*, const char_type*, size_t);
-  static size_t           length(const char_type*);
-  static const char_type* find(const char_type*, size_t, const char_type&);
-  static char_type*       move(char_type*, const char_type*, size_t);
-  static char_type*       copy(char_type*, const char_type*, size_t);
-  static char_type*       assign(char_type*, size_t, char_type);
+  static int              compare(const char_type*, const char_type*, std::size_t);
+  static std::size_t           length(const char_type*);
+  static const char_type* find(const char_type*, std::size_t, const char_type&);
+  static char_type*       move(char_type*, const char_type*, std::size_t);
+  static char_type*       copy(char_type*, const char_type*, std::size_t);
+  static char_type*       assign(char_type*, std::size_t, char_type);
 
   static int_type  not_eof(int_type);
   static char_type to_char_type(int_type);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.io/stream_insert_decl_present.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.io/stream_insert_decl_present.compile.pass.cpp
index 42a83f8..9698ba5 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.io/stream_insert_decl_present.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.io/stream_insert_decl_present.compile.pass.cpp
@@ -15,8 +15,9 @@
 //   operator<<(basic_ostream<charT, traits>& os,
 //              const basic_string_view<charT,traits> str);
 
-#include <string_view>
 #include <iosfwd>
+#include <string_view>
+#include <utility>
 
 template <class SV, class = void>
 struct HasDecl : std::false_type {};
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
index 9b96c05..e5f0db5 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
@@ -27,7 +27,7 @@
     typename S::const_reverse_iterator cb2 = s.crbegin();
     if (!s.empty())
     {
-        const size_t last = s.size() - 1;
+        const std::size_t last = s.size() - 1;
         assert(   *b ==  s[last]);
         assert(  &*b == &s[last]);
         assert( *cb1 ==  s[last]);
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
index bda42f0..4e41130 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     {
     SV sv1 ( s );
@@ -39,7 +39,7 @@
 }
 
 #if TEST_STD_VER > 11
-constexpr size_t test_ce ( size_t n, size_t k ) {
+constexpr std::size_t test_ce ( size_t n, size_t k ) {
     typedef std::basic_string_view<char> SV;
     SV sv1{ "ABCDEFGHIJKL", n };
     sv1.remove_prefix ( k );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
index 95a2331..2ebe665 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     {
     SV sv1 ( s );
@@ -40,7 +40,7 @@
 }
 
 #if TEST_STD_VER > 11
-constexpr size_t test_ce ( size_t n, size_t k ) {
+constexpr std::size_t test_ce ( size_t n, size_t k ) {
     typedef std::basic_string_view<char> SV;
     SV sv1{ "ABCDEFGHIJKL", n };
     sv1.remove_suffix ( k );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
index db22998..7f46cbf 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test ( const CharT *s, size_t len ) {
+void test ( const CharT *s, std::size_t len ) {
     typedef std::basic_string_view<CharT> SV;
     {
     SV sv1(s);
@@ -37,7 +37,7 @@
 }
 
 #if TEST_STD_VER > 11
-constexpr size_t test_ce ( size_t n, size_t k ) {
+constexpr std::size_t test_ce ( size_t n, size_t k ) {
     typedef std::basic_string_view<char> SV;
     SV sv1{ "ABCDEFGHIJKL", n };
     SV sv2 { sv1.data(), k };
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
index a7a5c30..b40ff64 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
@@ -23,7 +23,7 @@
 
 template<typename CharT>
 void test1 ( std::basic_string_view<CharT> sv1,
-             size_t pos1, size_t n1, const CharT *s, int expected ) {
+             std::size_t pos1, size_t n1, const CharT *s, int expected ) {
 #ifdef TEST_HAS_NO_EXCEPTIONS
     if (pos1 <= sv1.size())
         assert(sign(sv1.compare(pos1, n1, s)) == sign(expected));
@@ -40,7 +40,7 @@
 
 template<typename CharT>
 void
-test( const CharT *s1, size_t pos1, size_t n1, const CharT *s2, int expected)
+test( const CharT *s1, std::size_t pos1, size_t n1, const CharT *s2, int expected)
 {
     typedef std::basic_string_view<CharT> string_view_t;
     string_view_t sv1 ( s1 );
@@ -378,7 +378,7 @@
     test("abcdefghijklmnopqrst", 5, 5, "", 20);
     test("abcdefghijklmnopqrst", 0, 8, "abcde", 15);
     test("abcdefghijklmnopqrst", 0, 12, "abcdefghij", 10);
-    test("abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 0, static_cast<std::size_t>(-1), "abcdefghijklmnopqrst", 0);
     }
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
@@ -398,7 +398,7 @@
     test(L"abcdefghijklmnopqrst", 5, 5, L"", 20);
     test(L"abcdefghijklmnopqrst", 0, 8, L"abcde", 15);
     test(L"abcdefghijklmnopqrst", 0, 12, L"abcdefghij", 10);
-    test(L"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), L"abcdefghijklmnopqrst", 0);
+    test(L"abcdefghijklmnopqrst", 0, static_cast<std::size_t>(-1), L"abcdefghijklmnopqrst", 0);
     }
 #endif
 
@@ -419,7 +419,7 @@
     test(U"abcdefghijklmnopqrst", 5, 5, U"", 20);
     test(U"abcdefghijklmnopqrst", 0, 8, U"abcde", 15);
     test(U"abcdefghijklmnopqrst", 0, 12, U"abcdefghij", 10);
-    test(U"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), U"abcdefghijklmnopqrst", 0);
+    test(U"abcdefghijklmnopqrst", 0, static_cast<std::size_t>(-1), U"abcdefghijklmnopqrst", 0);
     }
 
     {
@@ -438,7 +438,7 @@
     test(u"abcdefghijklmnopqrst", 5, 5, u"", 20);
     test(u"abcdefghijklmnopqrst", 0, 8, u"abcde", 15);
     test(u"abcdefghijklmnopqrst", 0, 12, u"abcdefghij", 10);
-    test(u"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), u"abcdefghijklmnopqrst", 0);
+    test(u"abcdefghijklmnopqrst", 0, static_cast<std::size_t>(-1), u"abcdefghijklmnopqrst", 0);
     }
 #endif
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
index 477bfdd..c1999d2 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
@@ -22,7 +22,7 @@
 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
 
 template<typename CharT>
-void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
+void test1 ( std::basic_string_view<CharT> sv1, std::size_t pos1, size_t n1,
             std::basic_string_view<CharT> sv2, int expected ) {
 #ifdef TEST_HAS_NO_EXCEPTIONS
     if (pos1 <= sv1.size())
@@ -40,7 +40,7 @@
 
 
 template<typename CharT>
-void test ( const CharT *s1, size_t pos1, size_t n1, const CharT  *s2, int expected ) {
+void test ( const CharT *s1, std::size_t pos1, size_t n1, const CharT  *s2, int expected ) {
     typedef std::basic_string_view<CharT> string_view_t;
     string_view_t sv1 ( s1 );
     string_view_t sv2 ( s2 );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
index f0c4a79..4e5af15 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
@@ -23,8 +23,8 @@
 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
 
 template<typename CharT>
-void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
-             const CharT *s2, size_t n2, int expected ) {
+void test1 ( std::basic_string_view<CharT> sv1, std::size_t pos1, size_t n1,
+             const CharT *s2, std::size_t n2, int expected ) {
 #ifdef TEST_HAS_NO_EXCEPTIONS
     if (pos1 <= sv1.size())
         assert(sign(sv1.compare(pos1, n1, s2, n2)) == sign(expected));
@@ -41,8 +41,8 @@
 
 
 template<typename CharT>
-void test ( const CharT *s1, size_t pos1, size_t n1,
-            const CharT *s2, size_t n2,
+void test ( const CharT *s1, std::size_t pos1, size_t n1,
+            const CharT *s2, std::size_t n2,
             int expected ) {
     typedef std::basic_string_view<CharT> string_view_t;
     string_view_t sv1 ( s1 );
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
index a0f661c..a882372 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
@@ -23,8 +23,8 @@
 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
 
 template<typename CharT>
-void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
-             std::basic_string_view<CharT> sv2, size_t pos2, size_t n2,
+void test1 ( std::basic_string_view<CharT> sv1, std::size_t pos1, size_t n1,
+             std::basic_string_view<CharT> sv2, std::size_t pos2, size_t n2,
              int expected ) {
 #ifdef TEST_HAS_NO_EXCEPTIONS
     if (pos1 <= sv1.size() && pos2 <= sv2.size())
@@ -42,8 +42,8 @@
 
 
 template<typename CharT>
-void test ( const CharT *s1, size_t pos1, size_t n1,
-            const CharT *s2, size_t pos2, size_t n2,
+void test ( const CharT *s1, std::size_t pos1, size_t n1,
+            const CharT *s2, std::size_t pos2, size_t n2,
             int expected ) {
     typedef std::basic_string_view<CharT> string_view_t;
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/copy.pass.cpp
index 54e185f..0128e98 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/copy.pass.cpp
@@ -26,8 +26,8 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test1 ( std::basic_string_view<CharT> sv, size_t n, size_t pos ) {
-    const size_t rlen = std::min ( n, sv.size() - pos );
+void test1 ( std::basic_string_view<CharT> sv, std::size_t n, size_t pos ) {
+    const std::size_t rlen = std::min ( n, sv.size() - pos );
 
     CharT *dest1 = new CharT [rlen + 1];    dest1[rlen] = 0;
     CharT *dest2 = new CharT [rlen + 1];    dest2[rlen] = 0;
@@ -45,7 +45,7 @@
     } else {
         sv.copy(dest1, n, pos);
         std::copy_n(sv.begin() + pos, rlen, dest2);
-        for ( size_t i = 0; i <= rlen; ++i )
+        for ( std::size_t i = 0; i <= rlen; ++i )
             assert ( dest1[i] == dest2[i] );
     }
     delete [] dest1;
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/substr.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/substr.pass.cpp
index 92f9d8c..0de64f0 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/substr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/string.view.ops/substr.pass.cpp
@@ -24,7 +24,7 @@
 #include "test_macros.h"
 
 template<typename CharT>
-void test1(std::basic_string_view<CharT> sv, size_t n, size_t pos) {
+void test1(std::basic_string_view<CharT> sv, std::size_t n, size_t pos) {
     std::basic_string_view<CharT> sv1;
 #ifdef TEST_HAS_NO_EXCEPTIONS
     if (pos > sv.size())
@@ -40,9 +40,9 @@
         return ;
     }
 #endif
-    const size_t rlen = std::min(n, sv.size() - pos);
+    const std::size_t rlen = std::min(n, sv.size() - pos);
     assert (sv1.size() == rlen);
-    for (size_t i = 0; i < rlen; ++i)
+    for (std::size_t i = 0; i < rlen; ++i)
         assert(sv[pos+i] == sv1[i]);
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/strings/string.view/types.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/string.view/types.pass.cpp
index f952f20..25dc54d 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/string.view/types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/string.view/types.pass.cpp
@@ -47,7 +47,7 @@
     static_assert((std::is_same<typename S::traits_type,     Traits>::value), "");
     static_assert((std::is_same<typename S::value_type,      typename Traits::char_type>::value), "");
     static_assert((std::is_same<typename S::size_type,       std::size_t>::value), "");
-    static_assert((std::is_same<typename S::difference_type, ptrdiff_t>::value), "");
+    static_assert((std::is_same<typename S::difference_type, std::ptrdiff_t>::value), "");
     static_assert((std::is_same<typename S::reference,             typename S::value_type&>::value), "");
     static_assert((std::is_same<typename S::const_reference, const typename S::value_type&>::value), "");
     static_assert((std::is_same<typename S::pointer,               typename S::value_type*>::value), "");
diff --git a/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
index aa397ca..ed7dc3c 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
@@ -22,7 +22,7 @@
 #include "min_allocator.h"
 
 template <class S, class U>
-void test0(S s, U val, S expected, size_t expected_erased_count) {
+void test0(S s, U val, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
   assert(expected_erased_count == std::erase(s, val));
   LIBCPP_ASSERT(s.__invariants());
diff --git a/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp b/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
index 1957451..b098f88 100644
--- a/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
@@ -21,7 +21,7 @@
 #include "min_allocator.h"
 
 template <class S, class Pred>
-void test0(S s, Pred p, S expected, size_t expected_erased_count) {
+void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
   assert(expected_erased_count == std::erase_if(s, p));
   LIBCPP_ASSERT(s.__invariants());
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async.verify.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async.verify.cpp
index 997d27a..e47ad82 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async.verify.cpp
@@ -21,18 +21,10 @@
 
 
 #include <future>
-#include <atomic>
-#include <memory>
-#include <cassert>
-
-#include "test_macros.h"
 
 int foo (int x) { return x; }
 
-int main(int, char**)
-{
+void f() {
     std::async(                    foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::async(std::launch::async, foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
index d0cee30..310aac5 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
@@ -11,7 +11,7 @@
 
 // There's currently no release of OS X whose dylib contains the patch for
 // PR38682. Since the fix for future<void> is in the dylib, this test may fail.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // This test is designed to cause and allow TSAN to detect a race condition
 // in std::async, as reported in https://llvm.org/PR38682.
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
index ea25027..5871861 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
@@ -16,6 +16,7 @@
 
 #include <future>
 #include <cassert>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.future_error/what.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.future_error/what.pass.cpp
index f62212e..48ae35b 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.future_error/what.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.future_error/what.pass.cpp
@@ -11,7 +11,7 @@
 // LWG 2056 changed the values of future_errc, so if we're using new headers
 // with an old library we'll get incorrect messages.
 //
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
 // <future>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_assign.verify.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_assign.verify.cpp
index 96d7e57..84fa1c4 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_assign.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_assign.verify.cpp
@@ -16,10 +16,7 @@
 
 #include <future>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     {
         std::promise<int> p0, p;
         p = p0; // expected-error {{overload resolution selected deleted operator '='}}
@@ -32,6 +29,4 @@
         std::promise<void> p0, p;
         p = p0; // expected-error {{overload resolution selected deleted operator '='}}
     }
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_ctor.verify.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_ctor.verify.cpp
index b4f3d7f..437642b 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_ctor.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.promise/copy_ctor.verify.cpp
@@ -16,10 +16,7 @@
 
 #include <future>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     {
         std::promise<int> p0;
         std::promise<int> p(p0); // expected-error {{call to deleted constructor of 'std::promise<int>'}}
@@ -32,6 +29,4 @@
         std::promise<void> p0;
         std::promise<void> p(p0); // expected-error {{call to deleted constructor of 'std::promise<void>'}}
     }
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.shared_future/wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.shared_future/wait.pass.cpp
index 12c71ab..5709e9d 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.shared_future/wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.shared_future/wait.pass.cpp
@@ -18,6 +18,7 @@
 #include <cassert>
 #include <chrono>
 #include <future>
+#include <ratio>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_assign.verify.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_assign.verify.cpp
index 284ccd8..cb7e855 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_assign.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_assign.verify.cpp
@@ -16,10 +16,7 @@
 
 #include <future>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     {
         std::future<int> f0, f;
         f = f0; // expected-error {{overload resolution selected deleted operator '='}}
@@ -32,6 +29,4 @@
         std::future<void> f0, f;
         f = f0; // expected-error {{overload resolution selected deleted operator '='}}
     }
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_ctor.verify.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_ctor.verify.cpp
index 4424890..4ab51ef 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_ctor.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/copy_ctor.verify.cpp
@@ -16,10 +16,7 @@
 
 #include <future>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     {
         std::future<int> f0;
         std::future<int> f = f0; // expected-error {{call to deleted constructor of 'std::future<int>'}}
@@ -32,6 +29,4 @@
         std::future<void> f0;
         std::future<void> f = f0; // expected-error {{call to deleted constructor of 'std::future<void>'}}
     }
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/wait.pass.cpp
index 2385156..4e6b789 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/futures/futures.unique_future/wait.pass.cpp
@@ -18,6 +18,7 @@
 #include <cassert>
 #include <chrono>
 #include <future>
+#include <ratio>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
index c982c27..18cdc6d 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
index da75565..3fc4826 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
index 14503b4..2aee862 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/completion.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
index 7cc7ce9..7354dbe 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.condition/notify_all_at_thread_exit_lwg3343.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.condition/notify_all_at_thread_exit_lwg3343.pass.cpp
index a49a438..ffb632a 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.condition/notify_all_at_thread_exit_lwg3343.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.condition/notify_all_at_thread_exit_lwg3343.pass.cpp
@@ -8,11 +8,15 @@
 //
 // UNSUPPORTED: no-threads
 
-// ALLOW_RETRIES: 3
-
 // notify_all_at_thread_exit(...) requires move semantics to transfer the unique_lock.
 // UNSUPPORTED: c++03
 
+// The fix of LWG3343 is done in the dylib. That means Apple backdeployment
+// targets remain broken. Due to the nature of the test, testing on a broken
+// system does not guarantee that the test fails, so the test can't use XFAIL.
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{.+}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx11.{{.+}}
+
 // This is a regression test for LWG3343.
 //
 // <condition_variable>
@@ -29,6 +33,8 @@
 #include <mutex>
 #include <thread>
 
+int condition_variable_lock_skipped_counter = 0;
+
 union X {
     X() : cv_() {}
     ~X() {}
@@ -46,11 +52,13 @@
 
     for (int i = 0; i < N; ++i) {
         std::thread t = support::make_test_thread([&] {
-            // Signal thread completion
+            // Emulate work being done.
+            std::this_thread::sleep_for(std::chrono::milliseconds(1));
+
+            // Signal thread completion.
             std::unique_lock<std::mutex> lk(m);
             --threads_active;
             std::notify_all_at_thread_exit(x.cv_, std::move(lk));
-            std::this_thread::sleep_for(std::chrono::milliseconds(1));
         });
         t.detach();
     }
@@ -62,6 +70,15 @@
     // unlocks `m`.
     {
         std::unique_lock<std::mutex> lk(m);
+        // Due to OS scheduling the workers might have terminated when this
+        // code is reached. In that case the wait will not sleep and the call
+        // to notify_all_at_thread_exit has no effect; the condition variable
+        // will not be used here.
+        //
+        // Keep track of how often that happens, if too often the test needs
+        // to be improved.
+        if(threads_active == 0)
+            ++condition_variable_lock_skipped_counter;
         x.cv_.wait(lk, [&]() { return threads_active == 0; });
     }
 
@@ -92,5 +109,9 @@
         test();
     }
 
+    // The threshold is arbitrary, it just makes sure the notification is
+    // tested a reasonable number of times.
+    assert(condition_variable_lock_skipped_counter < 250);
+
     return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
index fd61634..4e20862 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
@@ -55,13 +55,14 @@
 //     that terminate has been called)
 
 
-#include <condition_variable>
 #include <atomic>
-#include <thread>
-#include <chrono>
-#include <string>
-#include <cstdlib>
 #include <cassert>
+#include <chrono>
+#include <condition_variable>
+#include <cstdlib>
+#include <exception>
+#include <string>
+#include <thread>
 
 #include "make_test_thread.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
index 37b0c6e..ddc06d2 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/count_down.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
index fe9578b..1503c09 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
index 6533b6c..70ef2cd 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
index cb105f2..4d11674 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
index 3fa4373..23a946b 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
index e901591..547e514 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
index 1db771d..4f6801e 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
index 9bbbb93..c76b73a 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
index c5536d8..3742bec 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -22,11 +21,12 @@
 // template<class _Mutex> shared_lock(shared_lock<_Mutex>)
 //     -> shared_lock<_Mutex>;  // C++17
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
index da4db9e..6a2e259 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
index 5c698e0..949d6c2 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
index 4c4f04a..3259ca7 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
index 7ab3c2c..c5d1614 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
index fde0ed6..4f7b764 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -19,11 +18,13 @@
 
 // shared_lock(mutex_type& m, try_to_lock_t);
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
+#include <mutex>
 #include <shared_mutex>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
index 1bc131a..e7d2462 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -19,11 +18,14 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
+#include <mutex>
 #include <shared_mutex>
+#include <system_error>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
index ae387cd..0e707fc 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
@@ -17,9 +17,10 @@
 
 // bool try_lock();
 
-#include <shared_mutex>
 #include <cassert>
 #include <mutex>
+#include <shared_mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
index 7f8189c..d28ae39 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
@@ -16,10 +16,11 @@
 // template <class Rep, class Period>
 //   bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
 
-#include <shared_mutex>
 #include <cassert>
 #include <chrono>
 #include <mutex>
+#include <shared_mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
index fb4afdd..880bf1c 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
@@ -16,10 +16,11 @@
 // template <class Clock, class Duration>
 //   bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
 
-#include <shared_mutex>
 #include <cassert>
 #include <chrono>
 #include <mutex>
+#include <shared_mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
index 210824e..4f31a75 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
@@ -15,8 +15,9 @@
 
 // void unlock();
 
-#include <shared_mutex>
 #include <cassert>
+#include <cerrno>
+#include <shared_mutex>
 #include <system_error>
 
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
index 216a6a0..d5c88ce 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
index abe9198..91e25a2 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
index bba78cf..2be2574 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
@@ -18,10 +18,11 @@
 // template<class _Mutex> unique_lock(unique_lock<_Mutex>)
 //     -> unique_lock<_Mutex>;  // C++17
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
index b2e8065..4adbe26 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
index fa00da6..06ef204 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
index 39d3bde..992d383 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 // ALLOW_RETRIES: 2
 
 // <mutex>
@@ -15,10 +16,11 @@
 
 // unique_lock(mutex_type& m, try_to_lock_t);
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
index b1b5af0..920baa7 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 // ALLOW_RETRIES: 2
 
 // <mutex>
@@ -15,10 +16,12 @@
 
 // void lock();
 
-#include <mutex>
-#include <thread>
-#include <cstdlib>
 #include <cassert>
+#include <chrono>
+#include <cstdlib>
+#include <mutex>
+#include <system_error>
+#include <thread>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
index 83e1d7e..4cf5ec2 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
-//
+// UNSUPPORTED: c++03
 // ALLOW_RETRIES: 2
 
 // <mutex>
@@ -16,8 +16,9 @@
 
 // bool try_lock();
 
-#include <mutex>
 #include <cassert>
+#include <mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
index 1a0fba6..8e7004e 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
@@ -15,8 +16,9 @@
 // template <class Rep, class Period>
 //   bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
 
-#include <mutex>
 #include <cassert>
+#include <mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
index 3f6f213..077bc51 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
@@ -15,8 +16,9 @@
 // template <class Clock, class Duration>
 //   bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
 
-#include <mutex>
 #include <cassert>
+#include <mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
index 4cd72b6..30c7951 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
@@ -14,8 +14,9 @@
 
 // void unlock();
 
-#include <mutex>
 #include <cassert>
+#include <mutex>
+#include <system_error>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/types.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
index 2776e00..bb4e9b4 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03
 
 // <mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
index 6f91cc3..b3e76cf 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
index 645b74b..bf3cb65 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
index 51b64b9..d9bff9b 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
index 801e2e7..1247c1c 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
index 4f95c5c..0dcd48e 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
index 182ba37..ad3ffd8 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
index 0402a89..84763cd 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
index 24a52ae..82ad573 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,10 +19,11 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
index 3f5a064..b761675 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,11 +19,12 @@
 
 // void lock_shared();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
index 92727ea..675369f 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,10 +19,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
index ac6a95b..33bbf0a 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,11 +19,12 @@
 
 // bool try_lock_shared();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
index 9af5a4f..ca1d0ff 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
index c9ec248..0458f9c 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
index 1456606..e663366 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
index c4836a5..606a377 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // ALLOW_RETRIES: 3
 
@@ -20,12 +19,12 @@
 
 // void lock();
 
-#include <thread>
-
 #include <atomic>
-#include <cstdlib>
 #include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
+#include <thread>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
index 1ec0814..20d7347 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // ALLOW_RETRIES: 3
 
@@ -20,12 +19,13 @@
 
 // void lock_shared();
 
-#include <thread>
 
 #include <atomic>
 #include <cassert>
+#include <chrono>
 #include <cstdlib>
 #include <shared_mutex>
+#include <thread>
 #include <vector>
 
 #include "make_test_thread.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
index 20eda45..52d7e22 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,10 +19,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
index fd08a2e..d5b9e2f 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
index d1f37a9..1c15acb 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
@@ -20,11 +19,12 @@
 
 // bool try_lock_shared();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <shared_mutex>
 #include <thread>
 #include <vector>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
index 1f8795e..a8b3802 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 3
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
index a3a37d5..9b57c76 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
index 5ac3cfb..6e53704 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
index 9589c8d..a8b44ef 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
index a2a91bc..a71bd3d 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
index 02d0874..f3942cc 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
index 91c6f1c..bad5a44 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // void lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
index 5915698..63be0ac 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
@@ -15,10 +15,11 @@
 
 // bool try_lock();
 
+#include <cassert>
+#include <chrono>
+#include <cstdlib>
 #include <mutex>
 #include <thread>
-#include <cstdlib>
-#include <cassert>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
index 32dd77c..3f6e310 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
index fe1d49f..111a650 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/max.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/max.pass.cpp
index 5a3026b..ca7ad0c 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/max.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/max.pass.cpp
@@ -21,6 +21,6 @@
   static_assert(std::counting_semaphore<>::max() >= 1, "");
   static_assert(std::counting_semaphore<1>::max() >= 1, "");
   static_assert(std::counting_semaphore<std::numeric_limits<int>::max()>::max() >= std::numeric_limits<int>::max(), "");
-  static_assert(std::counting_semaphore<std::numeric_limits<ptrdiff_t>::max()>::max() == std::numeric_limits<ptrdiff_t>::max(), "");
+  static_assert(std::counting_semaphore<std::numeric_limits<std::ptrdiff_t>::max()>::max() == std::numeric_limits<ptrdiff_t>::max(), "");
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/release.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
index 31a9264..bf3dd7f 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
index 9cdee8e..9fa01fc 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
index d6c898e..0d0f779 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
index 7766505..1d959e9 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
@@ -15,10 +15,11 @@
 
 // ~thread();
 
-#include <thread>
-#include <new>
-#include <cstdlib>
 #include <cassert>
+#include <cstdlib>
+#include <exception>
+#include <new>
+#include <thread>
 
 #include "make_test_thread.h"
 #include "test_macros.h"
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.format.pass.cpp
new file mode 100644
index 0000000..5ac9ec7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.format.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: no-threads
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
+// <thread>
+
+// template<class charT>
+// struct formatter<thread::id, charT>;
+
+// template<class... Args>
+//   string format(format_string<Args...> fmt, Args&&... args);
+// template<class... Args>
+//   wstring format(wformat_string<Args...> fmt, Args&&... args);
+
+#include <format>
+#include <cassert>
+
+#include "assert_macros.h"
+#include "concat_macros.h"
+#include "format.functions.tests.h"
+#include "test_format_string.h"
+#include "test_macros.h"
+
+auto test = []<class CharT, class... Args>(
+                std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
+  std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+};
+
+auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
+  // After P2216 most exceptions thrown by std::format become ill-formed.
+  // Therefore this tests does nothing.
+};
+
+int main(int, char**) {
+  format_tests<char>(test, test_exception);
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  format_tests<wchar_t>(test, test_exception);
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.tests.h
new file mode 100644
index 0000000..82e7212
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.tests.h
@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_STD_THREAD_THREAD_THREADS_THREAD_THREAD_CLASS_THREAD_THREAD_ID_FORMAT_FUNCTIONS_TESTS_H
+#define TEST_STD_THREAD_THREAD_THREADS_THREAD_THREAD_CLASS_THREAD_THREAD_ID_FORMAT_FUNCTIONS_TESTS_H
+
+#include <thread>
+
+#include "format.functions.common.h"
+#include "test_macros.h"
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void format_tests(TestFunction check, ExceptionTest check_exception) {
+  // Note the output of std::thread::id is unspecified. The output text is the
+  // same as the stream operator. Since that format is already released this
+  // test follows the practice on existing systems.
+  std::thread::id input{};
+
+  /***** Test the type specific part *****/
+#if !defined(__APPLE__) && !defined(__FreeBSD__)
+  check(SV("0"), SV("{}"), input);
+
+  // *** align-fill & width ***
+  check(SV("    0"), SV("{:5}"), input);
+  check(SV("0****"), SV("{:*<5}"), input);
+  check(SV("__0__"), SV("{:_^5}"), input);
+  check(SV("::::0"), SV("{::>5}"), input); // This is not a range, so : is allowed as fill character.
+
+  check(SV("    0"), SV("{:{}}"), input, 5);
+  check(SV("0****"), SV("{:*<{}}"), input, 5);
+  check(SV("__0__"), SV("{:_^{}}"), input, 5);
+  check(SV("####0"), SV("{:#>{}}"), input, 5);
+#else  // !defined(__APPLE__) && !defined(__FreeBSD__)
+  check(SV("0x0"), SV("{}"), input);
+
+  // *** align-fill & width ***
+  check(SV("    0x0"), SV("{:7}"), input);
+  check(SV("0x0****"), SV("{:*<7}"), input);
+  check(SV("__0x0__"), SV("{:_^7}"), input);
+  check(SV("::::0x0"), SV("{::>7}"), input); // This is not a range, so : is allowed as fill character.
+
+  check(SV("    0x0"), SV("{:{}}"), input, 7);
+  check(SV("0x0****"), SV("{:*<{}}"), input, 7);
+  check(SV("__0x0__"), SV("{:_^{}}"), input, 7);
+  check(SV("####0x0"), SV("{:#>{}}"), input, 7);
+#endif // !defined(__APPLE__) && !defined(__FreeBSD__)
+
+  /***** Test the type generic part *****/
+  check_exception("The format-spec fill field contains an invalid character", SV("{:}<}"), input);
+  check_exception("The format-spec fill field contains an invalid character", SV("{:{<}"), input);
+
+  // *** sign ***
+  check_exception("The replacement field misses a terminating '}'", SV("{:-}"), input);
+  check_exception("The replacement field misses a terminating '}'", SV("{:+}"), input);
+  check_exception("The replacement field misses a terminating '}'", SV("{: }"), input);
+
+  // *** alternate form ***
+  check_exception("The replacement field misses a terminating '}'", SV("{:#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{:0}"), input);
+
+  // *** precision ***
+  check_exception("The replacement field misses a terminating '}'", SV("{:.}"), input);
+
+  // *** locale-specific form ***
+  check_exception("The replacement field misses a terminating '}'", SV("{:L}"), input);
+
+  // *** type ***
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>(""))
+    check_exception("The replacement field misses a terminating '}'", fmt, input);
+}
+
+#endif // TEST_STD_THREAD_THREAD_THREADS_THREAD_THREAD_CLASS_THREAD_THREAD_ID_FORMAT_FUNCTIONS_TESTS_H
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.vformat.pass.cpp
new file mode 100644
index 0000000..555a10c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.functions.vformat.pass.cpp
@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: no-threads
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
+// <thread>
+
+// template<class charT>
+// struct formatter<thread::id, charT>;
+
+// string vformat(string_view fmt, format_args args);
+// wstring vformat(wstring_view fmt, wformat_args args);
+
+#include <format>
+#include <cassert>
+
+#include "assert_macros.h"
+#include "concat_macros.h"
+#include "format.functions.tests.h"
+#include "test_macros.h"
+
+auto test = []<class CharT, class... Args>(
+                std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
+  std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+};
+
+auto test_exception =
+    []<class CharT, class... Args>(
+        [[maybe_unused]] std::string_view what,
+        [[maybe_unused]] std::basic_string_view<CharT> fmt,
+        [[maybe_unused]] Args&&... args) {
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
+    };
+
+int main(int, char**) {
+  format_tests<char>(test, test_exception);
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  format_tests<wchar_t>(test, test_exception);
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.pass.cpp
new file mode 100644
index 0000000..548c9c1
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.pass.cpp
@@ -0,0 +1,73 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: no-threads
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <thread>
+
+// template<class charT>
+// struct formatter<thread::id, charT>;
+
+// template<class FormatContext>
+//   typename FormatContext::iterator
+//     format(const T& r, FormatContext& ctx) const;
+
+// Note this tests the basics of this function. It's tested in more detail in
+// the format functions test.
+
+#include <cassert>
+#include <concepts>
+#include <thread>
+
+#include "test_format_context.h"
+#include "test_macros.h"
+#include "make_string.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class StringViewT>
+void test_format(StringViewT expected, std::thread::id arg) {
+  using CharT      = typename StringViewT::value_type;
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+
+  const std::formatter<std::thread::id, CharT> formatter;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+  formatter.format(arg, format_ctx);
+  assert(result == expected);
+}
+
+template <class CharT>
+void test_fmt() {
+#if !defined(__APPLE__) && !defined(__FreeBSD__)
+  test_format(SV("0"), std::thread::id());
+#else
+  test_format(SV("0x0"), std::thread::id());
+#endif
+}
+
+void test() {
+  test_fmt<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_fmt<wchar_t>();
+#endif
+}
+
+int main(int, char**) {
+  test();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/parse.pass.cpp
new file mode 100644
index 0000000..e4b235e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/parse.pass.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: no-threads
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <thread>
+
+// template<class charT>
+// struct formatter<thread::id, charT>;
+
+// template<class ParseContext>
+//   constexpr typename ParseContext::iterator
+//     parse(ParseContext& ctx);
+
+// Note this tests the basics of this function. It's tested in more detail in
+// the format functions test.
+
+#include <cassert>
+#include <concepts>
+#include <thread>
+
+#include "test_format_context.h"
+#include "test_macros.h"
+#include "make_string.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class StringViewT>
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
+  using CharT    = typename StringViewT::value_type;
+  auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
+  std::formatter<std::thread::id, CharT> formatter;
+  static_assert(std::semiregular<decltype(formatter)>);
+
+  std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
+  assert(it == fmt.end() - offset);
+}
+
+template <class CharT>
+constexpr void test_fmt() {
+  test_parse(SV(""), 0);
+  test_parse(SV("1"), 0);
+
+  test_parse(SV("}"), 1);
+  test_parse(SV("1}"), 1);
+}
+
+constexpr bool test() {
+  test_fmt<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_fmt<wchar_t>();
+#endif
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
index 9050d9c..d9d21cc 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: no-localization
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <thread>
 
 // class thread::id
@@ -18,16 +21,38 @@
 // operator<<(basic_ostream<charT, traits>& out, thread::id id);
 
 #include <thread>
+#include <format>
 #include <sstream>
 #include <cassert>
 
+#include "make_string.h"
 #include "test_macros.h"
 
-int main(int, char**)
-{
-    std::thread::id id0 = std::this_thread::get_id();
-    std::ostringstream os;
-    os << id0;
+template <class CharT>
+static void test() {
+  std::thread::id id0 = std::this_thread::get_id();
+  std::basic_ostringstream<CharT> os;
+  os << id0;
+
+#if TEST_STD_VER > 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+  // C++23 added a formatter specialization for thread::id.
+  // This changed the requirement of ostream to have a
+  // [thread.thread.id]/2
+  //   The text representation for the character type charT of an object of
+  //   type thread::id is an unspecified sequence of charT ...
+  // This definition is used for both streaming and formatting.
+  //
+  // Test whether the output is identical.
+  std::basic_string<CharT> s = std::format(MAKE_STRING_VIEW(CharT, "{}"), id0);
+  assert(s == os.str());
+#endif
+}
+
+int main(int, char**) {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
index 3b4ae20..7a08065 100644
--- a/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
@@ -13,9 +13,10 @@
 // template <class Clock, class Duration>
 //   void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
 
-#include <thread>
-#include <cstdlib>
 #include <cassert>
+#include <chrono>
+#include <cstdlib>
+#include <thread>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
index 0e17304..c09a7ce 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
@@ -15,6 +15,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
index 4e4feda..6bf798e 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
index 491d30b..d0e3c14 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
@@ -18,6 +18,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
index 2efc023..b2c7a94 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
@@ -15,6 +15,12 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
index 006df5e..1eb750c 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
@@ -18,6 +18,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
index 0a76fbd..4e2675b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
@@ -18,6 +18,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
index 7a59350..e1ebe3b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
@@ -13,6 +13,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
index 90dca78..b1b8ebb 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
@@ -13,6 +13,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
index b52293b..b3b211d 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
@@ -10,6 +10,12 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
index c979fc2..43cb202 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
@@ -13,6 +13,12 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
index 13257cc..0d7923b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
@@ -18,6 +18,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
index 595e00f..0bb2655 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
index 9ded734..ac18927 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
@@ -18,6 +18,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
index 05578f6..6567f2f 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
index 1508133..f2a5620 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
index ad3daf7..cf4e39b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <chrono>
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
index df84bee..261b08b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <chrono>
 //
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.system/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.system/ostream.pass.cpp
new file mode 100644
index 0000000..dfa5122
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.clock/time.clock.system/ostream.pass.cpp
@@ -0,0 +1,197 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: no-localization
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Investigate Windows issues.
+// UNSUPPORTED msvc, target={{.+}}-windows-gnu
+// TODO FMT It seems GCC uses too much memory in the CI and fails.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
+// REQUIRES: locale.fr_FR.UTF-8
+// REQUIRES: locale.ja_JP.UTF-8
+
+// <chrono>
+
+// class system_clock;
+
+// template<class charT, class traits, class Duration>
+//   basic_ostream<charT, traits>&
+//     operator<<(basic_ostream<charT, traits>& os, const sys_time<Duration>& tp);
+
+#include <chrono>
+#include <cassert>
+#include <ratio>
+#include <sstream>
+
+#include "make_string.h"
+#include "platform_support.h" // locale name macros
+#include "test_macros.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_c_locale(std::chrono::sys_time<Duration> time_point) {
+  std::basic_stringstream<CharT> sstr;
+  sstr << std::fixed << time_point;
+  return sstr.str();
+}
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_fr_FR_locale(std::chrono::sys_time<Duration> time_point) {
+  std::basic_stringstream<CharT> sstr;
+  const std::locale locale(LOCALE_fr_FR_UTF_8);
+  sstr.imbue(locale);
+  sstr << std::fixed << time_point;
+  return sstr.str();
+}
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_ja_JP_locale(std::chrono::sys_time<Duration> time_point) {
+  std::basic_stringstream<CharT> sstr;
+  const std::locale locale(LOCALE_ja_JP_UTF_8);
+  sstr.imbue(locale);
+  sstr << std::fixed << time_point;
+  return sstr.str();
+}
+
+template <class CharT>
+static void test_c() {
+  using namespace std::literals::chrono_literals;
+
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::nanoseconds>{946'688'523'123'456'789ns}) ==
+         SV("2000-01-01 01:02:03.123456789"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::microseconds>{946'688'523'123'456us}) ==
+         SV("2000-01-01 01:02:03.123456"));
+
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::milliseconds>{946'684'800'123ms}) ==
+         SV("2000-01-01 00:00:00.123"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_seconds{1'234'567'890s}) == SV("2009-02-13 23:31:30"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::minutes>{20'576'131min}) ==
+         SV("2009-02-13 23:31:00"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::hours>{342'935h}) == SV("2009-02-13 23:00:00"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_days{std::chrono::days{14'288}}) == SV("2009-02-13 00:00:00"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::weeks>{std::chrono::weeks{2041}}) ==
+         SV("2009-02-12 00:00:00"));
+
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<signed char, std::ratio<2, 1>>>{
+             std::chrono::duration<signed char, std::ratio<2, 1>>{60}}) == SV("1970-01-01 00:02:00"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<short, std::ratio<1, 2>>>{
+             std::chrono::duration<short, std::ratio<1, 2>>{3600}}) == SV("1970-01-01 00:30:00.0"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<int, std::ratio<1, 4>>>{
+             std::chrono::duration<int, std::ratio<1, 4>>{3600}}) == SV("1970-01-01 00:15:00.00"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long, std::ratio<1, 10>>>{
+             std::chrono::duration<long, std::ratio<1, 10>>{36611}}) == SV("1970-01-01 01:01:01.1"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long long, std::ratio<1, 100>>>{
+             std::chrono::duration<long long, std::ratio<1, 100>>{12'345'678'9010}}) == SV("2009-02-13 23:31:30.10"));
+
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<float, std::ratio<1, 1>>>{
+             std::chrono::duration<float, std::ratio<1, 1>>{123.456}}) == SV("1970-01-01 00:02:03"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<double, std::ratio<1, 10>>>{
+             std::chrono::duration<double, std::ratio<1, 10>>{123.456}}) == SV("1970-01-01 00:00:12.3"));
+  assert(stream_c_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long double, std::ratio<1, 100>>>{
+             std::chrono::duration<long double, std::ratio<1, 100>>{123.456}}) == SV("1970-01-01 00:00:01.23"));
+}
+
+template <class CharT>
+static void test_fr_FR() {
+  using namespace std::literals::chrono_literals;
+
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::nanoseconds>{946'688'523'123'456'789ns}) ==
+         SV("2000-01-01 01:02:03,123456789"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::microseconds>{946'688'523'123'456us}) ==
+         SV("2000-01-01 01:02:03,123456"));
+
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::milliseconds>{946'684'800'123ms}) ==
+         SV("2000-01-01 00:00:00,123"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_seconds{1'234'567'890s}) == SV("2009-02-13 23:31:30"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::minutes>{20'576'131min}) ==
+         SV("2009-02-13 23:31:00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::hours>{342'935h}) == SV("2009-02-13 23:00:00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_days{std::chrono::days{14'288}}) == SV("2009-02-13 00:00:00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::weeks>{std::chrono::weeks{2041}}) ==
+         SV("2009-02-12 00:00:00"));
+
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<signed char, std::ratio<2, 1>>>{
+             std::chrono::duration<signed char, std::ratio<2, 1>>{60}}) == SV("1970-01-01 00:02:00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<short, std::ratio<1, 2>>>{
+             std::chrono::duration<short, std::ratio<1, 2>>{3600}}) == SV("1970-01-01 00:30:00,0"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<int, std::ratio<1, 4>>>{
+             std::chrono::duration<int, std::ratio<1, 4>>{3600}}) == SV("1970-01-01 00:15:00,00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long, std::ratio<1, 10>>>{
+             std::chrono::duration<long, std::ratio<1, 10>>{36611}}) == SV("1970-01-01 01:01:01,1"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long long, std::ratio<1, 100>>>{
+             std::chrono::duration<long long, std::ratio<1, 100>>{12'345'678'9010}}) == SV("2009-02-13 23:31:30,10"));
+
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<float, std::ratio<1, 1>>>{
+             std::chrono::duration<float, std::ratio<1, 1>>{123.456}}) == SV("1970-01-01 00:02:03"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<double, std::ratio<1, 10>>>{
+             std::chrono::duration<double, std::ratio<1, 10>>{123.456}}) == SV("1970-01-01 00:00:12,3"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long double, std::ratio<1, 100>>>{
+             std::chrono::duration<long double, std::ratio<1, 100>>{123.456}}) == SV("1970-01-01 00:00:01,23"));
+}
+
+template <class CharT>
+static void test_ja_JP() {
+  using namespace std::literals::chrono_literals;
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::nanoseconds>{946'688'523'123'456'789ns}) ==
+         SV("2000-01-01 01:02:03.123456789"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::microseconds>{946'688'523'123'456us}) ==
+         SV("2000-01-01 01:02:03.123456"));
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::milliseconds>{946'684'800'123ms}) ==
+         SV("2000-01-01 00:00:00.123"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_seconds{1'234'567'890s}) == SV("2009-02-13 23:31:30"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::minutes>{20'576'131min}) ==
+         SV("2009-02-13 23:31:00"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::hours>{342'935h}) == SV("2009-02-13 23:00:00"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_days{std::chrono::days{14'288}}) == SV("2009-02-13 00:00:00"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::weeks>{std::chrono::weeks{2041}}) ==
+         SV("2009-02-12 00:00:00"));
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<signed char, std::ratio<2, 1>>>{
+             std::chrono::duration<signed char, std::ratio<2, 1>>{60}}) == SV("1970-01-01 00:02:00"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<short, std::ratio<1, 2>>>{
+             std::chrono::duration<short, std::ratio<1, 2>>{3600}}) == SV("1970-01-01 00:30:00.0"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<int, std::ratio<1, 4>>>{
+             std::chrono::duration<int, std::ratio<1, 4>>{3600}}) == SV("1970-01-01 00:15:00.00"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long, std::ratio<1, 10>>>{
+             std::chrono::duration<long, std::ratio<1, 10>>{36611}}) == SV("1970-01-01 01:01:01.1"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long long, std::ratio<1, 100>>>{
+             std::chrono::duration<long long, std::ratio<1, 100>>{12'345'678'9010}}) == SV("2009-02-13 23:31:30.10"));
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<float, std::ratio<1, 1>>>{
+             std::chrono::duration<float, std::ratio<1, 1>>{123.456}}) == SV("1970-01-01 00:02:03"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<double, std::ratio<1, 10>>>{
+             std::chrono::duration<double, std::ratio<1, 10>>{123.456}}) == SV("1970-01-01 00:00:12.3"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::sys_time<std::chrono::duration<long double, std::ratio<1, 100>>>{
+             std::chrono::duration<long double, std::ratio<1, 100>>{123.456}}) == SV("1970-01-01 00:00:01.23"));
+}
+
+template <class CharT>
+static void test() {
+  test_c<CharT>();
+  test_fr_FR<CharT>();
+  test_ja_JP<CharT>();
+}
+
+int main(int, char**) {
+  test<char>();
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.comparisons/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.comparisons/compare.three_way.pass.cpp
new file mode 100644
index 0000000..282df3e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.comparisons/compare.three_way.pass.cpp
@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// duration
+
+// template<class Rep1, class Period1, class Rep2, class Period2>
+//     requires ThreeWayComparable<typename CT::rep>
+//   constexpr auto operator<=>(const duration<Rep1, Period1>& lhs,
+//                              const duration<Rep2, Period2>& rhs);
+
+#include <cassert>
+#include <chrono>
+#include <ratio>
+
+#include "test_comparisons.h"
+
+constexpr bool test() {
+  {
+    std::chrono::seconds s1(3);
+    std::chrono::seconds s2(3);
+    assert((s1 <=> s2) == std::strong_ordering::equal);
+    assert(testOrder(s1, s2, std::strong_ordering::equal));
+  }
+  {
+    std::chrono::seconds s1(3);
+    std::chrono::seconds s2(4);
+    assert((s1 <=> s2) == std::strong_ordering::less);
+    assert(testOrder(s1, s2, std::strong_ordering::less));
+  }
+  {
+    std::chrono::milliseconds s1(3);
+    std::chrono::microseconds s2(3000);
+    assert((s1 <=> s2) == std::strong_ordering::equal);
+    assert(testOrder(s1, s2, std::strong_ordering::equal));
+  }
+  {
+    std::chrono::milliseconds s1(3);
+    std::chrono::microseconds s2(4000);
+    assert((s1 <=> s2) == std::strong_ordering::less);
+    assert(testOrder(s1, s2, std::strong_ordering::less));
+  }
+  {
+    std::chrono::duration<int, std::ratio<2, 3>> s1(9);
+    std::chrono::duration<int, std::ratio<3, 5>> s2(10);
+    assert((s1 <=> s2) == std::strong_ordering::equal);
+    assert(testOrder(s1, s2, std::strong_ordering::equal));
+  }
+  {
+    std::chrono::duration<int, std::ratio<2, 3>> s1(10);
+    std::chrono::duration<int, std::ratio<3, 5>> s2(9);
+    assert((s1 <=> s2) == std::strong_ordering::greater);
+    assert(testOrder(s1, s2, std::strong_ordering::greater));
+  }
+  {
+    std::chrono::duration<int, std::ratio<2, 3>> s1(9);
+    std::chrono::duration<double, std::ratio<3, 5>> s2(10.1);
+    assert((s1 <=> s2) == std::strong_ordering::less);
+    assert(testOrder(s1, s2, std::strong_ordering::less));
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  assert(test());
+  static_assert(test());
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
index 0c2f685..2eab1c4 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
@@ -15,6 +15,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
@@ -31,6 +34,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <ratio>
 #include <sstream>
 
 #include "make_string.h"
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/seconds.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/seconds.pass.cpp
index 7aa9f3c..f0723be 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/seconds.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/seconds.pass.cpp
@@ -24,7 +24,7 @@
 #include "test_macros.h"
 
 template <typename Duration>
-constexpr int64_t check_seconds(Duration d)
+constexpr std::int64_t check_seconds(Duration d)
 {
     using HMS = std::chrono::hh_mm_ss<Duration>;
     ASSERT_SAME_TYPE(std::chrono::seconds, decltype(std::declval<HMS>().seconds()));
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/subseconds.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/subseconds.pass.cpp
index b3b46a9..6504d19 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/subseconds.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.members/subseconds.pass.cpp
@@ -24,7 +24,7 @@
 #include "test_macros.h"
 
 template <typename Duration>
-constexpr int64_t check_subseconds(Duration d)
+constexpr std::int64_t check_subseconds(Duration d)
 {
     using HMS = std::chrono::hh_mm_ss<Duration>;
     ASSERT_SAME_TYPE(typename HMS::precision, decltype(std::declval<HMS>().subseconds()));
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
new file mode 100644
index 0000000..c9937e7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
@@ -0,0 +1,162 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: no-localization
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Evaluate gcc-12 status
+// UNSUPPORTED: gcc-12
+
+// TODO FMT Investigate Windows issues.
+// UNSUPPORTED: msvc, target={{.+}}-windows-gnu
+
+// XFAIL: availability-fp_to_chars-missing
+
+// REQUIRES: locale.fr_FR.UTF-8
+// REQUIRES: locale.ja_JP.UTF-8
+
+// <chrono>
+
+// class hh_mm_ss;
+
+// template<class charT, class traits, class Duration>
+//   basic_ostream<charT, traits>&
+//     operator<<(basic_ostream<charT, traits>& os, const hh_mm_ss<Duration>& hms);
+
+#include <cassert>
+#include <chrono>
+#include <ratio>
+#include <sstream>
+
+#include "make_string.h"
+#include "platform_support.h" // locale name macros
+#include "test_macros.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_c_locale(std::chrono::hh_mm_ss<Duration> hms) {
+  std::basic_stringstream<CharT> sstr;
+  sstr << hms;
+  return sstr.str();
+}
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_fr_FR_locale(std::chrono::hh_mm_ss<Duration> hms) {
+  std::basic_stringstream<CharT> sstr;
+  const std::locale locale(LOCALE_fr_FR_UTF_8);
+  sstr.imbue(locale);
+  sstr << hms;
+  return sstr.str();
+}
+
+template <class CharT, class Duration>
+static std::basic_string<CharT> stream_ja_JP_locale(std::chrono::hh_mm_ss<Duration> hms) {
+  std::basic_stringstream<CharT> sstr;
+  const std::locale locale(LOCALE_ja_JP_UTF_8);
+  sstr.imbue(locale);
+  sstr << hms;
+  return sstr.str();
+}
+
+template <class CharT>
+static void test() {
+  // Note std::atto can't be tested since the ratio conversion from std::atto
+  // std::chrono::seconds to std::chrono::hours overflows when intmax_t is a
+  // 64-bit type. This is a limitiation in the constructor of
+  // std::chrono::hh_mm_ss.
+
+  // C locale - integral power of 10 ratios
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::femto>{1'234'567'890}}) ==
+         SV("00:00:00.000001234567890"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::pico>{1'234'567'890}}) ==
+         SV("00:00:00.001234567890"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::nano>{1'234'567'890}}) ==
+         SV("00:00:01.234567890"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::micro>{1'234'567}}) ==
+         SV("00:00:01.234567"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::milli>{123'456}}) ==
+         SV("00:02:03.456"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::centi>{12'345}}) ==
+         SV("00:02:03.45"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::deci>{1'234}}) ==
+         SV("00:02:03.4"));
+
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t>{123}}) == SV("00:02:03"));
+
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::deca>{-366}}) ==
+         SV("-01:01:00"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::hecto>{-72}}) ==
+         SV("-02:00:00"));
+  assert(stream_c_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::kilo>{-86}}) ==
+         SV("-23:53:20"));
+
+  // Starting at mega it will pass one day
+
+  // fr_FR locale - integral power of not 10 ratios
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{
+             std::chrono::duration<std::intmax_t, std::ratio<1, 5'000'000>>{5'000}}) == SV("00:00:00,0010000"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 8'000>>{3}}) ==
+         SV("00:00:00,000375"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 4'000>>{1}}) ==
+         SV("00:00:00,00025"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 5'000>>{5}}) ==
+         SV("00:00:00,0010"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 8>>{-4}}) ==
+         SV("-00:00:00,500"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 4>>{-8}}) ==
+         SV("-00:00:02,00"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 5>>{-5}}) ==
+         SV("-00:00:01,0"));
+
+  // TODO FMT Note there's no wording on the rounding
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 9>>{5}}) ==
+         SV("00:00:00,555555"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 7>>{7}}) ==
+         SV("00:00:01,000000"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 6>>{1}}) ==
+         SV("00:00:00,166666"));
+  assert(stream_fr_FR_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<std::intmax_t, std::ratio<1, 3>>{2}}) ==
+         SV("00:00:00,666666"));
+
+  // ja_JP locale - floating points
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{
+             std::chrono::duration<long double, std::femto>{1'234'567'890.123}}) == SV("00:00:00.000001234567890"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{
+             std::chrono::duration<long double, std::pico>{1'234'567'890.123}}) == SV("00:00:00.001234567890"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{
+             std::chrono::duration<long double, std::nano>{1'234'567'890.123}}) == SV("00:00:01.234567890"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::micro>{1'234'567.123}}) ==
+         SV("00:00:01.234567"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::milli>{123'456.123}}) ==
+         SV("00:02:03.456"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::centi>{12'345.123}}) ==
+         SV("00:02:03.45"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<float, std::deci>{1'234.123}}) ==
+         SV("00:02:03.4"));
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<float>{123.123}}) == SV("00:02:03"));
+
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::deca>{-366.5}}) ==
+         SV("-01:01:05"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::hecto>{-72.64}}) ==
+         SV("-02:01:04"));
+  assert(stream_ja_JP_locale<CharT>(std::chrono::hh_mm_ss{std::chrono::duration<double, std::kilo>{-86}}) ==
+         SV("-23:53:20"));
+}
+
+int main(int, char**) {
+  test<char>();
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.compile.fail.cpp
new file mode 100644
index 0000000..9d4ab04
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.compile.fail.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// time_point
+
+// template<class Clock, class Duration1,
+//          three_way_comparable_with<Duration1> Duration2>
+//   constexpr auto operator<=>(const time_point<Clock, Duration1>& lhs,
+//                              const time_point<Clock, Duration2>& rhs);
+
+// time_points with different clocks should not compare
+
+#include <chrono>
+
+#include "../../clock.h"
+
+int main(int, char**) {
+  using namespace std::chrono_literals;
+  std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds> t1{3ms};
+  std::chrono::time_point<Clock, std::chrono::milliseconds> t2{3ms};
+
+  t1 <=> t2;
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.pass.cpp
new file mode 100644
index 0000000..aed8013
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.pass.cpp
@@ -0,0 +1,127 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// time_point
+
+// template<class Clock, class Duration1,
+//          three_way_comparable_with<Duration1> Duration2>
+//   constexpr auto operator<=>(const time_point<Clock, Duration1>& lhs,
+//                              const time_point<Clock, Duration2>& rhs);
+
+#include <cassert>
+#include <chrono>
+#include <ratio>
+
+#include "test_comparisons.h"
+
+constexpr void test_with_integral_ticks_value() {
+  using Clock = std::chrono::system_clock;
+
+  using Duration1 = std::chrono::milliseconds;
+  using Duration2 = std::chrono::microseconds;
+  using T1        = std::chrono::time_point<Clock, Duration1>;
+  using T2        = std::chrono::time_point<Clock, Duration2>;
+
+  {
+    T1 t1(Duration1(3));
+    T1 t2(Duration1(3));
+    assert((t1 <=> t2) == std::strong_ordering::equal);
+    assert(testOrder(t1, t2, std::strong_ordering::equal));
+  }
+  {
+    T1 t1(Duration1(3));
+    T1 t2(Duration1(4));
+    assert((t1 <=> t2) == std::strong_ordering::less);
+    assert(testOrder(t1, t2, std::strong_ordering::less));
+  }
+  {
+    T1 t1(Duration1(3));
+    T2 t2(Duration2(3000));
+    assert((t1 <=> t2) == std::strong_ordering::equal);
+    assert(testOrder(t1, t2, std::strong_ordering::equal));
+  }
+  {
+    T1 t1(Duration1(3));
+    T2 t2(Duration2(3001));
+    assert((t1 <=> t2) == std::strong_ordering::less);
+    assert(testOrder(t1, t2, std::strong_ordering::less));
+    assert((t2 <=> t1) == std::strong_ordering::greater);
+    assert(testOrder(t2, t1, std::strong_ordering::greater));
+  }
+}
+
+constexpr void test_with_integral_ticks_value_and_custom_period_value() {
+  using Clock = std::chrono::system_clock;
+
+  using DInt30Hz = std::chrono::duration<int, std::ratio<1, 30>>;
+  using DInt60Hz = std::chrono::duration<int, std::ratio<1, 60>>;
+
+  using TIntR1 = std::chrono::time_point<Clock, DInt30Hz>;
+  using TIntR2 = std::chrono::time_point<Clock, DInt60Hz>;
+
+  {
+    TIntR1 t1(DInt30Hz(10));
+    TIntR2 t2(DInt60Hz(20));
+    assert((t1 <=> t2) == std::strong_ordering::equal);
+    assert(testOrder(t1, t2, std::strong_ordering::equal));
+  }
+  {
+    TIntR1 t1(DInt30Hz(10));
+    TIntR2 t2(DInt60Hz(21));
+    assert((t1 <=> t2) == std::strong_ordering::less);
+    assert(testOrder(t1, t2, std::strong_ordering::less));
+  }
+  {
+    TIntR1 t1(DInt30Hz(11));
+    TIntR2 t2(DInt60Hz(20));
+    assert((t1 <=> t2) == std::strong_ordering::greater);
+    assert(testOrder(t1, t2, std::strong_ordering::greater));
+  }
+}
+
+constexpr void test_with_floating_point_ticks_value() {
+  using Clock = std::chrono::system_clock;
+
+  using DF30Hz = std::chrono::duration<double, std::ratio<1, 30>>;
+  using DF60Hz = std::chrono::duration<double, std::ratio<1, 60>>;
+  using F1     = std::chrono::time_point<Clock, DF30Hz>;
+  using F2     = std::chrono::time_point<Clock, DF60Hz>;
+
+  // No equality comparison test for floating point values.
+
+  {
+    F1 t1(DF30Hz(3.5));
+    F2 t2(DF60Hz(7.1));
+    assert((t1 <=> t2) == std::weak_ordering::less);
+    assert(testOrder(t1, t2, std::weak_ordering::less));
+  }
+  {
+    F1 t1(DF30Hz(3.6));
+    F2 t2(DF60Hz(7.0));
+    assert((t1 <=> t2) == std::weak_ordering::greater);
+    assert(testOrder(t1, t2, std::weak_ordering::greater));
+  }
+}
+
+constexpr bool test() {
+  test_with_integral_ticks_value();
+  test_with_integral_ticks_value_and_custom_period_value();
+  test_with_floating_point_ticks_value();
+
+  return true;
+}
+
+int main(int, char**) {
+  assert(test());
+  static_assert(test());
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.day.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
index 373db72..88057ea 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
@@ -14,6 +14,12 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
index 1a2fcca..1ae518e 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
@@ -16,6 +16,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
@@ -31,6 +33,7 @@
 #include <concepts>
 #include <locale>
 #include <iostream>
+#include <ratio>
 #include <type_traits>
 
 #include "formatter_tests.h"
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
new file mode 100644
index 0000000..c3001a7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
@@ -0,0 +1,561 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: no-localization
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Evaluate gcc-12 status
+// UNSUPPORTED: gcc-12
+
+// TODO FMT Investigate Windows issues.
+// UNSUPPORTED: msvc, target={{.+}}-windows-gnu
+
+// XFAIL: LIBCXX-FREEBSD-FIXME
+
+// XFAIL: availability-fp_to_chars-missing
+
+// REQUIRES: locale.fr_FR.UTF-8
+// REQUIRES: locale.ja_JP.UTF-8
+
+// <chrono>
+
+// template<class Rep, class Period, class charT>
+//   struct formatter<chrono::hh_mm_ss<duration<Rep, Period>>, charT>;
+
+#include <chrono>
+#include <format>
+
+#include <cassert>
+#include <concepts>
+#include <locale>
+#include <iostream>
+#include <ratio>
+#include <type_traits>
+
+#include "formatter_tests.h"
+#include "make_string.h"
+#include "platform_support.h" // locale name macros
+#include "string_literal.h"
+#include "test_macros.h"
+
+template <class CharT>
+static void test_no_chrono_specs() {
+  using namespace std::literals::chrono_literals;
+
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output
+  check(SV("00:00:00.000"), SV("{}"), std::chrono::hh_mm_ss{0ms});
+  check(SV("*00:00:00.000*"), SV("{:*^14}"), std::chrono::hh_mm_ss{0ms});
+  check(SV("*00:00:00.000"), SV("{:*>13}"), std::chrono::hh_mm_ss{0ms});
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt = SV(
+      "{:"
+      "%%H='%H'%t"
+      "%%OH='%OH'%t"
+      "%%I='%I'%t"
+      "%%OI='%OI'%t"
+      "%%M='%M'%t"
+      "%%OM='%OM'%t"
+      "%%S='%S'%t"
+      "%%OS='%OS'%t"
+      "%%p='%p'%t"
+      "%%R='%R'%t"
+      "%%T='%T'%t"
+      "%%r='%r'%t"
+      "%%X='%X'%t"
+      "%%EX='%EX'%t"
+      "%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV(
+      "{:L"
+      "%%H='%H'%t"
+      "%%OH='%OH'%t"
+      "%%I='%I'%t"
+      "%%OI='%OI'%t"
+      "%%M='%M'%t"
+      "%%OM='%OM'%t"
+      "%%S='%S'%t"
+      "%%OS='%OS'%t"
+      "%%p='%p'%t"
+      "%%R='%R'%t"
+      "%%T='%T'%t"
+      "%%r='%r'%t"
+      "%%X='%X'%t"
+      "%%EX='%EX'%t"
+      "%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+           "%p='AM'\t"
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+           "%r='12:00:00 AM'\t"
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+           "\n"),
+        fmt,
+        std::chrono::hh_mm_ss(0s));
+
+  check(SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30.123'\t"
+           "%OS='30.123'\t"
+           "%p='PM'\t"
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+           "%r='11:31:30 PM'\t"
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+           "\n"),
+        fmt,
+        std::chrono::hh_mm_ss(23h + 31min + 30s + 123ms));
+
+  check(SV("-%H='03'\t"
+           "%OH='03'\t"
+           "%I='03'\t"
+           "%OI='03'\t"
+           "%M='02'\t"
+           "%OM='02'\t"
+           "%S='01.123456789012'\t"
+           "%OS='01.123456789012'\t"
+           "%p='AM'\t"
+           "%R='03:02'\t"
+           "%T='03:02:01.123456789012'\t"
+           "%r='03:02:01 AM'\t"
+           "%X='03:02:01'\t"
+           "%EX='03:02:01'\t"
+           "\n"),
+        fmt,
+        std::chrono::hh_mm_ss(-(3h + 2min + 1s + std::chrono::duration<std::int64_t, std::pico>(123456789012))));
+
+  // The number of fractional seconds is 0 according to the Standard
+  // TODO FMT Determine what to do.
+  check(SV("%H='01'\t"
+           "%OH='01'\t"
+           "%I='01'\t"
+           "%OI='01'\t"
+           "%M='01'\t"
+           "%OM='01'\t"
+           "%S='01'\t"
+           "%OS='01'\t"
+           "%p='AM'\t"
+           "%R='01:01'\t"
+           "%T='01:01:01'\t"
+           "%r='01:01:01 AM'\t"
+           "%X='01:01:01'\t"
+           "%EX='01:01:01'\t"
+           "\n"),
+        fmt,
+        std::chrono::hh_mm_ss(std::chrono::duration<double>(3661.123456)));
+
+  // Use the global locale (fr_FR)
+  check(SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+#if defined(_AIX)
+           "%p='AM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+#ifdef _WIN32
+           "%r='00:00:00'\t"
+#elif defined(_AIX)
+           "%r='12:00:00 AM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='12:00:00 '\t"
+#endif
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(0s));
+
+  check(SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30,123'\t"
+           "%OS='30,123'\t"
+#if defined(_AIX)
+           "%p='PM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='23:31'\t"
+           "%T='23:31:30,123'\t"
+#ifdef _WIN32
+           "%r='23:31:30'\t"
+#elif defined(_AIX)
+           "%r='11:31:30 PM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='11:31:30 '\t"
+#endif
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(23h + 31min + 30s + 123ms));
+
+  check(SV("-%H='03'\t"
+           "%OH='03'\t"
+           "%I='03'\t"
+           "%OI='03'\t"
+           "%M='02'\t"
+           "%OM='02'\t"
+           "%S='01,123456789012'\t"
+           "%OS='01,123456789012'\t"
+#if defined(_AIX)
+           "%p='AM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='03:02'\t"
+           "%T='03:02:01,123456789012'\t"
+#ifdef _WIN32
+           "%r='03:02:01'\t"
+#elif defined(_AIX)
+           "%r='03:02:01 AM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='03:02:01 '\t"
+#endif
+           "%X='03:02:01'\t"
+           "%EX='03:02:01'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(-(3h + 2min + 1s + std::chrono::duration<std::int64_t, std::pico>(123456789012))));
+
+  check(SV("%H='01'\t"
+           "%OH='01'\t"
+           "%I='01'\t"
+           "%OI='01'\t"
+           "%M='01'\t"
+           "%OM='01'\t"
+           "%S='01'\t"
+           "%OS='01'\t"
+#if defined(_AIX)
+           "%p='AM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='01:01'\t"
+           "%T='01:01:01'\t"
+#ifdef _WIN32
+           "%r='01:01:01'\t"
+#elif defined(_AIX)
+           "%r='01:01:01 AM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='01:01:01 '\t"
+#endif
+           "%X='01:01:01'\t"
+           "%EX='01:01:01'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(std::chrono::duration<double>(3661.123456)));
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+#  if defined(__APPLE__)
+           "%p='AM'\t"
+#  else
+           "%p='午前'\t"
+#  endif
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+#  if defined(__APPLE__)
+           "%r='12:00:00 AM'\t"
+           "%X='00時00分00秒'\t"
+           "%EX='00時00分00秒'\t"
+#  else
+           "%r='午前12:00:00'\t"
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(0s));
+
+  check(loc,
+        SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30.123'\t"
+           "%OS='30.123'\t"
+#  if defined(__APPLE__)
+           "%p='PM'\t"
+#  else
+           "%p='午後'\t"
+#  endif
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+#  if defined(__APPLE__)
+           "%r='11:31:30 PM'\t"
+           "%X='23時31分30秒'\t"
+           "%EX='23時31分30秒'\t"
+#  else
+           "%r='午後11:31:30'\t"
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(23h + 31min + 30s + 123ms));
+
+  check(loc,
+        SV("-%H='03'\t"
+           "%OH='03'\t"
+           "%I='03'\t"
+           "%OI='03'\t"
+           "%M='02'\t"
+           "%OM='02'\t"
+           "%S='01.123456789012'\t"
+           "%OS='01.123456789012'\t"
+#  if defined(__APPLE__)
+           "%p='AM'\t"
+#  else
+           "%p='午前'\t"
+#  endif
+           "%R='03:02'\t"
+           "%T='03:02:01.123456789012'\t"
+#  if defined(__APPLE__)
+           "%r='03:02:01 AM'\t"
+           "%X='03時02分01秒'\t"
+           "%EX='03時02分01秒'\t"
+#  else
+           "%r='午前03:02:01'\t"
+           "%X='03:02:01'\t"
+           "%EX='03:02:01'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(-(3h + 2min + 1s + std::chrono::duration<std::int64_t, std::pico>(123456789012))));
+
+  check(loc,
+        SV("%H='01'\t"
+           "%OH='01'\t"
+           "%I='01'\t"
+           "%OI='01'\t"
+           "%M='01'\t"
+           "%OM='01'\t"
+           "%S='01'\t"
+           "%OS='01'\t"
+#  if defined(__APPLE__)
+           "%p='AM'\t"
+#  else
+           "%p='午前'\t"
+#  endif
+           "%R='01:01'\t"
+           "%T='01:01:01'\t"
+#  if defined(__APPLE__)
+           "%r='01:01:01 AM'\t"
+           "%X='01時01分01秒'\t"
+           "%EX='01時01分01秒'\t"
+#  else
+           "%r='午前01:01:01'\t"
+           "%X='01:01:01'\t"
+           "%EX='01:01:01'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(std::chrono::duration<double>(3661.123456)));
+#else  // defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%H='00'\t"
+           "%OH='〇'\t"
+           "%I='12'\t"
+           "%OI='十二'\t"
+           "%M='00'\t"
+           "%OM='〇'\t"
+           "%S='00'\t"
+           "%OS='〇'\t"
+           "%p='午前'\t"
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+           "%r='午前12時00分00秒'\t"
+           "%X='00時00分00秒'\t"
+           "%EX='00時00分00秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(0s));
+
+  // TODO FMT What should fractions be in alternate display mode?
+  check(loc,
+        SV("%H='23'\t"
+           "%OH='二十三'\t"
+           "%I='11'\t"
+           "%OI='十一'\t"
+           "%M='31'\t"
+           "%OM='三十一'\t"
+           "%S='30.123'\t"
+           "%OS='三十.123'\t"
+           "%p='午後'\t"
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+           "%r='午後11時31分30秒'\t"
+           "%X='23時31分30秒'\t"
+           "%EX='23時31分30秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(23h + 31min + 30s + 123ms));
+
+  check(loc,
+        SV("-%H='03'\t"
+           "%OH='三'\t"
+           "%I='03'\t"
+           "%OI='三'\t"
+           "%M='02'\t"
+           "%OM='二'\t"
+           "%S='01.123456789012'\t"
+           "%OS='一.123456789012'\t"
+           "%p='午前'\t"
+           "%R='03:02'\t"
+           "%T='03:02:01.123456789012'\t"
+           "%r='午前03時02分01秒'\t"
+           "%X='03時02分01秒'\t"
+           "%EX='03時02分01秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(-(3h + 2min + 1s + std::chrono::duration<std::int64_t, std::pico>(123456789012))));
+
+  check(loc,
+        SV("%H='01'\t"
+           "%OH='一'\t"
+           "%I='01'\t"
+           "%OI='一'\t"
+           "%M='01'\t"
+           "%OM='一'\t"
+           "%S='01'\t"
+           "%OS='一'\t"
+           "%p='午前'\t"
+           "%R='01:01'\t"
+           "%T='01:01:01'\t"
+           "%r='午前01時01分01秒'\t"
+           "%X='01時01分01秒'\t"
+           "%EX='01時01分01秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(std::chrono::duration<double>(3661.123456)));
+#endif // defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_invalid_values() {
+  using namespace std::literals::chrono_literals;
+
+  // This looks odd, however the 24 hours is not valid for a 24 hour clock.
+  // TODO FMT discuss what the "proper" behaviour is.
+  check_exception("formatting a hour needs a valid value", SV("{:%H"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%OH"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%I"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%OI"), std::chrono::hh_mm_ss{24h});
+  check(SV("00"), SV("{:%M}"), std::chrono::hh_mm_ss{24h});
+  check(SV("00"), SV("{:%OM}"), std::chrono::hh_mm_ss{24h});
+  check(SV("00"), SV("{:%S}"), std::chrono::hh_mm_ss{24h});
+  check(SV("00"), SV("{:%OS}"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%p"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%R"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%T"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%r"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%X"), std::chrono::hh_mm_ss{24h});
+  check_exception("formatting a hour needs a valid value", SV("{:%EX"), std::chrono::hh_mm_ss{24h});
+}
+
+template <class CharT>
+static void test() {
+  using namespace std::literals::chrono_literals;
+
+  test_no_chrono_specs<CharT>();
+  test_valid_values<CharT>();
+  test_invalid_values<CharT>();
+  check_invalid_types<CharT>(
+      {SV("H"),
+       SV("I"),
+       SV("M"),
+       SV("S"),
+       SV("p"),
+       SV("r"),
+       SV("R"),
+       SV("T"),
+       SV("X"),
+       SV("OH"),
+       SV("OI"),
+       SV("OM"),
+       SV("OS"),
+       SV("EX")},
+      std::chrono::hh_mm_ss{0ms});
+
+  check_exception("Expected '%' or '}' in the chrono format-string", SV("{:A"), std::chrono::hh_mm_ss{0ms});
+  check_exception("The chrono-specs contains a '{'", SV("{:%%{"), std::chrono::hh_mm_ss{0ms});
+  check_exception(
+      "End of input while parsing the modifier chrono conversion-spec", SV("{:%"), std::chrono::hh_mm_ss{0ms});
+  check_exception("End of input while parsing the modifier E", SV("{:%E"), std::chrono::hh_mm_ss{0ms});
+  check_exception("End of input while parsing the modifier O", SV("{:%O"), std::chrono::hh_mm_ss{0ms});
+
+  check_exception("Expected '%' or '}' in the chrono format-string", SV("{:.3}"), std::chrono::hh_mm_ss{0ms});
+}
+
+int main(int, char**) {
+  test<char>();
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
index 324887f..5342ef7 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
@@ -11,6 +11,12 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
index f86476f..146b98b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
@@ -17,6 +17,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
index 7c78271..b3b6944 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
@@ -14,6 +14,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
index f34b22c..56b60c7 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
@@ -14,6 +14,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.sys_time.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.sys_time.pass.cpp
new file mode 100644
index 0000000..cdaa19e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.sys_time.pass.cpp
@@ -0,0 +1,940 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: no-localization
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// XFAIL: LIBCXX-FREEBSD-FIXME
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
+// TODO FMT Investigate Windows issues.
+// UNSUPPORTED: msvc, target={{.+}}-windows-gnu
+// TODO FMT It seems GCC uses too much memory in the CI and fails.
+// UNSUPPORTED: gcc-12
+
+// REQUIRES: locale.fr_FR.UTF-8
+// REQUIRES: locale.ja_JP.UTF-8
+
+// <chrono>
+//
+// template<class charT> struct formatter<chrono::day, charT>;
+
+#include <chrono>
+#include <format>
+
+#include <cassert>
+#include <concepts>
+#include <locale>
+#include <iostream>
+#include <type_traits>
+
+#include "formatter_tests.h"
+#include "make_string.h"
+#include "platform_support.h" // locale name macros
+#include "test_macros.h"
+
+template <class CharT>
+static void test_no_chrono_specs() {
+  using namespace std::literals::chrono_literals;
+
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output
+  check(SV("1970-01-01 00:00:00"), SV("{}"), std::chrono::sys_seconds(0s));
+  check(SV("2000-01-01 00:00:00"), SV("{}"), std::chrono::sys_seconds(946'684'800s));
+  check(SV("2000-01-01 01:02:03"), SV("{}"), std::chrono::sys_seconds(946'688'523s));
+
+  check(SV("2000-01-01 01:02:03.123"), SV("{}"), std::chrono::sys_time<std::chrono::milliseconds>(946'688'523'123ms));
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_year() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt =
+      SV("{:%%C='%C'%t%%EC='%EC'%t%%y='%y'%t%%Oy='%Oy'%t%%Ey='%Ey'%t%%Y='%Y'%t%%EY='%EY'%n}");
+  constexpr std::basic_string_view<CharT> lfmt =
+      SV("{:L%%C='%C'%t%%EC='%EC'%t%%y='%y'%t%%Oy='%Oy'%t%%Ey='%Ey'%t%%Y='%Y'%t%%EY='%EY'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%C='19'\t%EC='19'\t%y='70'\t%Oy='70'\t%Ey='70'\t%Y='1970'\t%EY='1970'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%C='20'\t%EC='20'\t%y='09'\t%Oy='09'\t%Ey='09'\t%Y='2009'\t%EY='2009'\n"),
+        fmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use the global locale (fr_FR)
+  check(SV("%C='19'\t%EC='19'\t%y='70'\t%Oy='70'\t%Ey='70'\t%Y='1970'\t%EY='1970'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%C='20'\t%EC='20'\t%y='09'\t%Oy='09'\t%Ey='09'\t%Y='2009'\t%EY='2009'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%C='19'\t%EC='19'\t%y='70'\t%Oy='70'\t%Ey='70'\t%Y='1970'\t%EY='1970'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%C='20'\t%EC='20'\t%y='09'\t%Oy='09'\t%Ey='09'\t%Y='2009'\t%EY='2009'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else                                              // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%C='19'\t%EC='昭和'\t%y='70'\t%Oy='七十'\t%Ey='45'\t%Y='1970'\t%EY='昭和45年'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%C='20'\t%EC='平成'\t%y='09'\t%Oy='九'\t%Ey='21'\t%Y='2009'\t%EY='平成21年'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif                                             // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_month() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%b='%b'%t%%h='%h'%t%%B='%B'%t%%m='%m'%t%%Om='%Om'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%b='%b'%t%%h='%h'%t%%B='%B'%t%%m='%m'%t%%Om='%Om'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%b='Jan'\t%h='Jan'\t%B='January'\t%m='01'\t%Om='01'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%b='May'\t%h='May'\t%B='May'\t%m='05'\t%Om='05'\n"),
+        fmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use the global locale (fr_FR)
+#if defined(__APPLE__)
+  check(SV("%b='jan'\t%h='jan'\t%B='janvier'\t%m='01'\t%Om='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+#else
+  check(SV("%b='janv.'\t%h='janv.'\t%B='janvier'\t%m='01'\t%Om='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+#endif
+
+  check(SV("%b='mai'\t%h='mai'\t%B='mai'\t%m='05'\t%Om='05'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#ifdef _WIN32
+  check(loc,
+        SV("%b='1'\t%h='1'\t%B='1月'\t%m='01'\t%Om='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%b='5'\t%h='5'\t%B='5月'\t%m='05'\t%Om='05'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#elif defined(_AIX)                                // _WIN32
+  check(loc,
+        SV("%b='1月'\t%h='1月'\t%B='1月'\t%m='01'\t%Om='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%b='5月'\t%h='5月'\t%B='5月'\t%m='05'\t%Om='05'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#elif defined(__APPLE__)                           // _WIN32
+  check(loc,
+        SV("%b=' 1'\t%h=' 1'\t%B='1月'\t%m='01'\t%Om='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%b=' 5'\t%h=' 5'\t%B='5月'\t%m='05'\t%Om='05'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#else                                              // _WIN32
+  check(loc,
+        SV("%b=' 1月'\t%h=' 1月'\t%B='1月'\t%m='01'\t%Om='一'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%b=' 5月'\t%h=' 5月'\t%B='5月'\t%m='05'\t%Om='五'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#endif                                             // _WIN32
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_day() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%d='%d'%t%%Od='%Od'%t%%e='%e'%t%%Oe='%Oe'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%d='%d'%t%%Od='%Od'%t%%e='%e'%t%%Oe='%Oe'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%d='01'\t%Od='01'\t%e=' 1'\t%Oe=' 1'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%d='13'\t%Od='13'\t%e='13'\t%Oe='13'\n"),
+        fmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use the global locale (fr_FR)
+  check(SV("%d='01'\t%Od='01'\t%e=' 1'\t%Oe=' 1'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%d='13'\t%Od='13'\t%e='13'\t%Oe='13'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%d='01'\t%Od='01'\t%e=' 1'\t%Oe=' 1'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%d='13'\t%Od='13'\t%e='13'\t%Oe='13'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else                                              // _WIN32
+  check(loc,
+        SV("%d='01'\t%Od='一'\t%e=' 1'\t%Oe='一'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%d='13'\t%Od='十三'\t%e='13'\t%Oe='十三'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+#endif                                             // _WIN32
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_weekday() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt =
+      SV("{:%%a='%a'%t%%A='%A'%t%%u='%u'%t%%Ou='%Ou'%t%%w='%w'%t%%Ow='%Ow'%n}");
+  constexpr std::basic_string_view<CharT> lfmt =
+      SV("{:L%%a='%a'%t%%A='%A'%t%%u='%u'%t%%Ou='%Ou'%t%%w='%w'%t%%Ow='%Ow'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%a='Thu'\t%A='Thursday'\t%u='4'\t%Ou='4'\t%w='4'\t%Ow='4'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%a='Sun'\t%A='Sunday'\t%u='7'\t%Ou='7'\t%w='0'\t%Ow='0'\n"),
+        fmt,
+        std::chrono::sys_seconds(4'294'967'295s)); // 06:28:15 UTC on Sunday, 7 February 2106
+
+  // Use the global locale (fr_FR)
+#if defined(__APPLE__)
+  check(SV("%a='Jeu'\t%A='Jeudi'\t%u='4'\t%Ou='4'\t%w='4'\t%Ow='4'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%a='Dim'\t%A='Dimanche'\t%u='7'\t%Ou='7'\t%w='0'\t%Ow='0'\n"),
+        lfmt,
+        std::chrono::sys_seconds(4'294'967'295s)); // 06:28:15 UTC on Sunday, 7 February 2106
+#else
+  check(SV("%a='jeu.'\t%A='jeudi'\t%u='4'\t%Ou='4'\t%w='4'\t%Ow='4'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%a='dim.'\t%A='dimanche'\t%u='7'\t%Ou='7'\t%w='0'\t%Ow='0'\n"),
+        lfmt,
+        std::chrono::sys_seconds(4'294'967'295s)); // 06:28:15 UTC on Sunday, 7 February 2106
+#endif
+
+  // Use supplied locale (ja_JP).
+  // This locale has a different alternate, but not on all platforms
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%a='木'\t%A='木曜日'\t%u='4'\t%Ou='4'\t%w='4'\t%Ow='4'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%a='日'\t%A='日曜日'\t%u='7'\t%Ou='7'\t%w='0'\t%Ow='0'\n"),
+        lfmt,
+        std::chrono::sys_seconds(4'294'967'295s)); // 06:28:15 UTC on Sunday, 7 February 2106
+#else                                              // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%a='木'\t%A='木曜日'\t%u='4'\t%Ou='四'\t%w='4'\t%Ow='四'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%a='日'\t%A='日曜日'\t%u='7'\t%Ou='七'\t%w='0'\t%Ow='〇'\n"),
+        lfmt,
+        std::chrono::sys_seconds(4'294'967'295s)); // 06:28:15 UTC on Sunday, 7 February 2106
+#endif                                             // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_day_of_year() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%j='%j'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%j='%j'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%j='001'\n"), fmt, std::chrono::sys_seconds(0s));             // 00:00:00 UTC Thursday, 1 January 1970
+  check(SV("%j='138'\n"), fmt, std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use the global locale (fr_FR)
+  check(SV("%j='001'\n"), lfmt, std::chrono::sys_seconds(0s));             // 00:00:00 UTC Thursday, 1 January 1970
+  check(SV("%j='138'\n"), lfmt, std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+  check(loc, SV("%j='001'\n"), lfmt, std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(
+      loc, SV("%j='138'\n"), lfmt, std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_week() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%U='%U'%t%%OU='%OU'%t%%W='%W'%t%%OW='%OW'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%U='%U'%t%%OU='%OU'%t%%W='%W'%t%%OW='%OW'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%U='00'\t%OU='00'\t%W='00'\t%OW='00'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%U='20'\t%OU='20'\t%W='20'\t%OW='20'\n"),
+        fmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use the global locale (fr_FR)
+  check(SV("%U='00'\t%OU='00'\t%W='00'\t%OW='00'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%U='20'\t%OU='20'\t%W='20'\t%OW='20'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%U='00'\t%OU='00'\t%W='00'\t%OW='00'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%U='20'\t%OU='20'\t%W='20'\t%OW='20'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#else                                              // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%U='00'\t%OU='〇'\t%W='00'\t%OW='〇'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%U='20'\t%OU='二十'\t%W='20'\t%OW='二十'\n"),
+        lfmt,
+        std::chrono::sys_seconds(2'000'000'000s)); // 03:33:20 UTC on Wednesday, 18 May 2033
+#endif                                             // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_iso_8601_week() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%g='%g'%t%%G='%G'%t%%V='%V'%t%%OV='%OV'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%g='%g'%t%%G='%G'%t%%V='%V'%t%%OV='%OV'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%g='70'\t%G='1970'\t%V='01'\t%OV='01'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%g='09'\t%G='2009'\t%V='07'\t%OV='07'\n"),
+        fmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use the global locale (fr_FR)
+  check(SV("%g='70'\t%G='1970'\t%V='01'\t%OV='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%g='09'\t%G='2009'\t%V='07'\t%OV='07'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%g='70'\t%G='1970'\t%V='01'\t%OV='01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%g='09'\t%G='2009'\t%V='07'\t%OV='07'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else                                              // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%g='70'\t%G='1970'\t%V='01'\t%OV='一'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%g='09'\t%G='2009'\t%V='07'\t%OV='七'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif                                             // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_date() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%D='%D'%t%%F='%F'%t%%x='%x'%t%%Ex='%Ex'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%D='%D'%t%%F='%F'%t%%x='%x'%t%%Ex='%Ex'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%D='01/01/70'\t%F='1970-01-01'\t%x='01/01/70'\t%Ex='01/01/70'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%D='02/13/09'\t%F='2009-02-13'\t%x='02/13/09'\t%Ex='02/13/09'\n"),
+        fmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use the global locale (fr_FR)
+#if defined(__APPLE__)
+  check(SV("%D='01/01/70'\t%F='1970-01-01'\t%x='01.01.1970'\t%Ex='01.01.1970'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%D='02/13/09'\t%F='2009-02-13'\t%x='13.02.2009'\t%Ex='13.02.2009'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else
+  check(SV("%D='01/01/70'\t%F='1970-01-01'\t%x='01/01/1970'\t%Ex='01/01/1970'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%D='02/13/09'\t%F='2009-02-13'\t%x='13/02/2009'\t%Ex='13/02/2009'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.
+#if defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%D='01/01/70'\t%F='1970-01-01'\t%x='1970/01/01'\t%Ex='1970/01/01'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%D='02/13/09'\t%F='2009-02-13'\t%x='2009/02/13'\t%Ex='2009/02/13'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else                                              // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%D='01/01/70'\t%F='1970-01-01'\t%x='1970年01月01日'\t%Ex='昭和45年01月01日'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%D='02/13/09'\t%F='2009-02-13'\t%x='2009年02月13日'\t%Ex='平成21年02月13日'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif                                             // defined(_WIN32) || defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_time() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt = SV(
+      "{:"
+      "%%H='%H'%t"
+      "%%OH='%OH'%t"
+      "%%I='%I'%t"
+      "%%OI='%OI'%t"
+      "%%M='%M'%t"
+      "%%OM='%OM'%t"
+      "%%S='%S'%t"
+      "%%OS='%OS'%t"
+      "%%p='%p'%t"
+      "%%R='%R'%t"
+      "%%T='%T'%t"
+      "%%r='%r'%t"
+      "%%X='%X'%t"
+      "%%EX='%EX'%t"
+      "%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV(
+      "{:L"
+      "%%H='%H'%t"
+      "%%OH='%OH'%t"
+      "%%I='%I'%t"
+      "%%OI='%OI'%t"
+      "%%M='%M'%t"
+      "%%OM='%OM'%t"
+      "%%S='%S'%t"
+      "%%OS='%OS'%t"
+      "%%p='%p'%t"
+      "%%R='%R'%t"
+      "%%T='%T'%t"
+      "%%r='%r'%t"
+      "%%X='%X'%t"
+      "%%EX='%EX'%t"
+      "%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+           "%p='AM'\t"
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+           "%r='12:00:00 AM'\t"
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+           "\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30.123'\t"
+           "%OS='30.123'\t"
+           "%p='PM'\t"
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+           "%r='11:31:30 PM'\t"
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+           "\n"),
+        fmt,
+        std::chrono::sys_time<std::chrono::milliseconds>(
+            1'234'567'890'123ms)); // 23:31:30 UTC on Friday, 13 February 2009
+  // Use the global locale (fr_FR)
+  check(SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+#if defined(_AIX)
+           "%p='AM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+#ifdef _WIN32
+           "%r='00:00:00'\t"
+#elif defined(_AIX)
+           "%r='12:00:00 AM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='12:00:00 '\t"
+#endif
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+           "\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30,123'\t"
+           "%OS='30,123'\t"
+#if defined(_AIX)
+           "%p='PM'\t"
+#else
+           "%p=''\t"
+#endif
+           "%R='23:31'\t"
+           "%T='23:31:30,123'\t"
+#ifdef _WIN32
+           "%r='23:31:30'\t"
+#elif defined(_AIX)
+           "%r='11:31:30 PM'\t"
+#elif defined(__APPLE__)
+           "%r=''\t"
+#else
+           "%r='11:31:30 '\t"
+#endif
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+           "\n"),
+        lfmt,
+        std::chrono::sys_time<std::chrono::milliseconds>(
+            1'234'567'890'123ms)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.a
+#if defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%H='00'\t"
+           "%OH='00'\t"
+           "%I='12'\t"
+           "%OI='12'\t"
+           "%M='00'\t"
+           "%OM='00'\t"
+           "%S='00'\t"
+           "%OS='00'\t"
+#  if defined(__APPLE__)
+           "%p='AM'\t"
+#  else
+           "%p='午前'\t"
+#  endif
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+#  if defined(__APPLE__)
+           "%r='12:00:00 AM'\t"
+           "%X='00時00分00秒'\t"
+           "%EX='00時00分00秒'\t"
+#  else
+           "%r='午前12:00:00'\t"
+           "%X='00:00:00'\t"
+           "%EX='00:00:00'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(0s));
+
+  check(loc,
+        SV("%H='23'\t"
+           "%OH='23'\t"
+           "%I='11'\t"
+           "%OI='11'\t"
+           "%M='31'\t"
+           "%OM='31'\t"
+           "%S='30.123'\t"
+           "%OS='30.123'\t"
+#  if defined(__APPLE__)
+           "%p='PM'\t"
+#  else
+           "%p='午後'\t"
+#  endif
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+#  if defined(__APPLE__)
+           "%r='11:31:30 PM'\t"
+           "%X='23時31分30秒'\t"
+           "%EX='23時31分30秒'\t"
+#  else
+           "%r='午後11:31:30'\t"
+           "%X='23:31:30'\t"
+           "%EX='23:31:30'\t"
+#  endif
+           "\n"),
+        lfmt,
+        std::chrono::hh_mm_ss(23h + 31min + 30s + 123ms));
+#else  // defined(__APPLE__) || defined(_AIX)
+  check(loc,
+        SV("%H='00'\t"
+           "%OH='〇'\t"
+           "%I='12'\t"
+           "%OI='十二'\t"
+           "%M='00'\t"
+           "%OM='〇'\t"
+           "%S='00'\t"
+           "%OS='〇'\t"
+           "%p='午前'\t"
+           "%R='00:00'\t"
+           "%T='00:00:00'\t"
+           "%r='午前12時00分00秒'\t"
+           "%X='00時00分00秒'\t"
+           "%EX='00時00分00秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%H='23'\t"
+           "%OH='二十三'\t"
+           "%I='11'\t"
+           "%OI='十一'\t"
+           "%M='31'\t"
+           "%OM='三十一'\t"
+           "%S='30.123'\t"
+           "%OS='三十.123'\t"
+           "%p='午後'\t"
+           "%R='23:31'\t"
+           "%T='23:31:30.123'\t"
+           "%r='午後11時31分30秒'\t"
+           "%X='23時31分30秒'\t"
+           "%EX='23時31分30秒'\t"
+           "\n"),
+        lfmt,
+        std::chrono::sys_time<std::chrono::milliseconds>(
+            1'234'567'890'123ms)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif // defined(__APPLE__) || defined(_AIX)
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_date_time() {
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%c='%c'%t%%Ec='%Ec'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%c='%c'%t%%Ec='%Ec'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+  // Non localized output using C-locale
+  check(SV("%c='Thu Jan  1 00:00:00 1970'\t%Ec='Thu Jan  1 00:00:00 1970'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(SV("%c='Fri Feb 13 23:31:30 2009'\t%Ec='Fri Feb 13 23:31:30 2009'\n"),
+        fmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use the global locale (fr_FR)
+  check(
+// https://sourceware.org/bugzilla/show_bug.cgi?id=24054
+#if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 29
+      SV("%c='jeu. 01 janv. 1970 00:00:00 GMT'\t%Ec='jeu. 01 janv. 1970 00:00:00 GMT'\n"),
+#elif defined(_AIX)
+      SV("%c=' 1 janvier 1970 à 00:00:00 UTC'\t%Ec=' 1 janvier 1970 à 00:00:00 UTC'\n"),
+#elif defined(__APPLE__)
+      SV("%c='Jeu  1 jan 00:00:00 1970'\t%Ec='Jeu  1 jan 00:00:00 1970'\n"),
+#else
+      SV("%c='jeu. 01 janv. 1970 00:00:00'\t%Ec='jeu. 01 janv. 1970 00:00:00'\n"),
+#endif
+      lfmt,
+      std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(
+// https://sourceware.org/bugzilla/show_bug.cgi?id=24054
+#if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 29
+      SV("%c='ven. 13 févr. 2009 23:31:30 GMT'\t%Ec='ven. 13 févr. 2009 23:31:30 GMT'\n"),
+#elif defined(_AIX)
+      SV("%c='13 février 2009 à 23:31:30 UTC'\t%Ec='13 février 2009 à 23:31:30 UTC'\n"),
+#elif defined(__APPLE__)
+      SV("%c='Ven 13 fév 23:31:30 2009'\t%Ec='Ven 13 fév 23:31:30 2009'\n"),
+#else
+      SV("%c='ven. 13 févr. 2009 23:31:30'\t%Ec='ven. 13 févr. 2009 23:31:30'\n"),
+#endif
+      lfmt,
+      std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.a
+#if defined(__APPLE__)
+  check(loc,
+        SV("%c='木  1/ 1 00:00:00 1970'\t%Ec='木  1/ 1 00:00:00 1970'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+  check(loc,
+        SV("%c='金  2/13 23:31:30 2009'\t%Ec='金  2/13 23:31:30 2009'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#elif defined(_AIX)                                // __APPLE__
+  check(loc,
+        SV("%c='1970年01月 1日 00:00:00 UTC'\t%Ec='1970年01月 1日 00:00:00 UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+  check(loc,
+        SV("%c='2009年02月13日 23:31:30 UTC'\t%Ec='2009年02月13日 23:31:30 UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#else                                              // __APPLE__
+  check(loc,
+        SV("%c='1970年01月01日 00時00分00秒'\t%Ec='昭和45年01月01日 00時00分00秒'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  check(loc,
+        SV("%c='2009年02月13日 23時31分30秒'\t%Ec='平成21年02月13日 23時31分30秒'\n"),
+        lfmt,
+        std::chrono::sys_seconds(1'234'567'890s)); // 23:31:30 UTC on Friday, 13 February 2009
+#endif                                             // __APPLE__
+
+  std::locale::global(std::locale::classic());
+}
+
+template <class CharT>
+static void test_valid_values_time_zone() {
+// The Apple CI gives %z='-0700'	%Ez='-0700'	%Oz='-0700'	%Z='UTC'
+// -0700 looks like the local time where the CI happens to recide, therefore
+// omit this test on Apple.
+#if !defined(__APPLE__)
+  using namespace std::literals::chrono_literals;
+
+  constexpr std::basic_string_view<CharT> fmt  = SV("{:%%z='%z'%t%%Ez='%Ez'%t%%Oz='%Oz'%t%%Z='%Z'%n}");
+  constexpr std::basic_string_view<CharT> lfmt = SV("{:L%%z='%z'%t%%Ez='%Ez'%t%%Oz='%Oz'%t%%Z='%Z'%n}");
+
+  const std::locale loc(LOCALE_ja_JP_UTF_8);
+  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));
+
+#  if defined(_AIX)
+  // Non localized output using C-locale
+  check(SV("%z='UTC'\t%Ez='UTC'\t%Oz='UTC'\t%Z='UTC'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  // Use the global locale (fr_FR)
+  check(SV("%z='UTC'\t%Ez='UTC'\t%Oz='UTC'\t%Z='UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.a
+  check(loc,
+        SV("%z='UTC'\t%Ez='UTC'\t%Oz='UTC'\t%Z='UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+#  else                                // defined(_AIX)
+  // Non localized output using C-locale
+  check(SV("%z='+0000'\t%Ez='+0000'\t%Oz='+0000'\t%Z='UTC'\n"),
+        fmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  // Use the global locale (fr_FR)
+  check(SV("%z='+0000'\t%Ez='+0000'\t%Oz='+0000'\t%Z='UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+
+  // Use supplied locale (ja_JP). This locale has a different alternate.a
+  check(loc,
+        SV("%z='+0000'\t%Ez='+0000'\t%Oz='+〇'\t%Z='UTC'\n"),
+        lfmt,
+        std::chrono::sys_seconds(0s)); // 00:00:00 UTC Thursday, 1 January 1970
+#  endif                               // defined(_AIX)
+  std::locale::global(std::locale::classic());
+#endif                                 // !defined(__APPLE__)
+}
+
+template <class CharT>
+static void test_valid_values() {
+  test_valid_values_year<CharT>();
+  test_valid_values_month<CharT>();
+  test_valid_values_day<CharT>();
+  test_valid_values_weekday<CharT>();
+  test_valid_values_day_of_year<CharT>();
+  test_valid_values_week<CharT>();
+  test_valid_values_iso_8601_week<CharT>();
+  test_valid_values_date<CharT>();
+  test_valid_values_time<CharT>();
+  test_valid_values_date_time<CharT>();
+  test_valid_values_time_zone<CharT>();
+}
+
+template <class CharT>
+static void test() {
+  using namespace std::literals::chrono_literals;
+
+  test_no_chrono_specs<CharT>();
+  test_valid_values<CharT>();
+  check_invalid_types<CharT>(
+      {SV("a"),  SV("A"),  SV("b"),  SV("B"),  SV("c"),  SV("C"),  SV("d"),  SV("D"),  SV("e"),  SV("F"),  SV("g"),
+       SV("G"),  SV("h"),  SV("H"),  SV("I"),  SV("j"),  SV("m"),  SV("M"),  SV("p"),  SV("r"),  SV("R"),  SV("S"),
+       SV("T"),  SV("u"),  SV("U"),  SV("V"),  SV("w"),  SV("W"),  SV("x"),  SV("X"),  SV("y"),  SV("Y"),  SV("z"),
+       SV("Z"),  SV("Ec"), SV("EC"), SV("Ex"), SV("EX"), SV("Ey"), SV("EY"), SV("Ez"), SV("Od"), SV("Oe"), SV("OH"),
+       SV("OI"), SV("Om"), SV("OM"), SV("OS"), SV("Ou"), SV("OU"), SV("OV"), SV("Ow"), SV("OW"), SV("Oy"), SV("Oz")},
+      std::chrono::sys_seconds(0s));
+
+  check_exception("Expected '%' or '}' in the chrono format-string", SV("{:A"), std::chrono::sys_seconds(0s));
+  check_exception("The chrono-specs contains a '{'", SV("{:%%{"), std::chrono::sys_seconds(0s));
+  check_exception(
+      "End of input while parsing the modifier chrono conversion-spec", SV("{:%"), std::chrono::sys_seconds(0s));
+  check_exception("End of input while parsing the modifier E", SV("{:%E"), std::chrono::sys_seconds(0s));
+  check_exception("End of input while parsing the modifier O", SV("{:%O"), std::chrono::sys_seconds(0s));
+
+  // Precision not allowed
+  check_exception("Expected '%' or '}' in the chrono format-string", SV("{:.3}"), std::chrono::sys_seconds(0s));
+}
+
+int main(int, char**) {
+  test<char>();
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
index 1b3fbe9..7901d9d 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
@@ -14,6 +14,12 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
index 5493034..e2e2425 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
@@ -17,6 +17,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
index e3fa9ae..33661be 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
@@ -17,6 +17,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
index beb4732..ec254f4 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
@@ -14,6 +14,12 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
index 344967d..3875ce1 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
@@ -14,6 +14,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
index 25d5a58..f97675e 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
@@ -17,6 +17,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
index 35ce599..7462811 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
@@ -14,6 +14,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
index 617f183..03d8c3b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
@@ -14,6 +14,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
index 50968a3..5d59bf0 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
@@ -12,6 +12,9 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter_tests.h b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter_tests.h
index 115d6cc..42c176b 100644
--- a/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter_tests.h
+++ b/third_party/llvm-project/libcxx/test/std/time/time.syn/formatter_tests.h
@@ -15,6 +15,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <iostream>
 #include <set>
 #include <string>
 #include <string_view>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.verify.cpp
index fd4d03e..6bd5f80 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.verify.cpp
@@ -16,14 +16,10 @@
 // pointer allocate(size_type n);
 
 #include <scoped_allocator>
-#include <cassert>
 
 #include "allocators.h"
 
-int main(int, char**)
-{
+void f() {
     std::scoped_allocator_adaptor<A1<int>> a;
     a.allocate(10);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.verify.cpp
index 6e60b6a..05588df 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.verify.cpp
@@ -16,14 +16,10 @@
 // pointer allocate(size_type n, const_void_pointer hint);
 
 #include <scoped_allocator>
-#include <cassert>
 
 #include "allocators.h"
 
-int main(int, char**)
-{
+void f() {
     std::scoped_allocator_adaptor<A1<int>> a;
     a.allocate(10, (const void*)0); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
index f235b70..0d4cab8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
index ec0b6c0..08c9acd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
index a4a4095..7bd0ffa 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
index 892ef43..6bb5f13 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
index a1205bf..ec53bf1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
index d70b688..a8a362b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
index c7ccc58..ed7f4e9 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
index 7c5fbfe..00c4c50 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
@@ -25,9 +24,11 @@
 #include "test_macros.h"
 
 struct Tracked {
-  static int count;
-  Tracked()  {++count;}
-  ~Tracked() { --count; }
+    static int count;
+    Tracked() { ++count; }
+    Tracked(Tracked const&) noexcept { ++count; }
+    Tracked& operator=(Tracked const&) = default;
+    ~Tracked() { --count; }
 };
 int Tracked::count = 0;
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
index 7499ed0..eee478d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
index 9e07586..163dafc 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
index 2afac84..4faa75f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
index 5c7c29f..e2db999 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
index 2dc8bd2..23847fe 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
index a066c6a..3bf6279 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
@@ -30,8 +29,7 @@
 struct TestType {};
 struct TestType2 {};
 
-int main(int, char**)
-{
+void f() {
     std::any a;
 
     // expected-error-re@any:* {{{{(static_assert|static assertion)}} failed{{.*}}ValueType is required to be a const lvalue reference or a CopyConstructible type}}
@@ -45,6 +43,4 @@
 
     // expected-error-re@any:* {{{{(static_assert|static assertion)}} failed{{.*}}ValueType is required to be a const lvalue reference or a CopyConstructible type}}
     std::any_cast<TestType2 &&>(static_cast<std::any const&&>(a)); // expected-note {{requested here}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
index a3b3b3b..d1fd05b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
@@ -33,20 +32,19 @@
 
 #include <any>
 
-struct no_copy
-{
+struct no_copy {
     no_copy() {}
     no_copy(no_copy &&) {}
     no_copy(no_copy const &) = delete;
 };
 
 struct no_move {
-  no_move() {}
-  no_move(no_move&&) = delete;
-  no_move(no_move const&) {}
+    no_move() {}
+    no_move(no_move&&) = delete;
+    no_move(no_move const&) {}
 };
 
-int main(int, char**) {
+void f() {
     std::any a;
     // expected-error-re@any:* {{{{(static_assert|static assertion)}} failed{{.*}}ValueType is required to be an lvalue reference or a CopyConstructible type}}
     std::any_cast<no_copy>(static_cast<std::any&>(a)); // expected-note {{requested here}}
@@ -58,6 +56,4 @@
 
     // expected-error-re@any:* {{{{(static_assert|static assertion)}} failed{{.*}}ValueType is required to be an rvalue reference or a CopyConstructible type}}
     std::any_cast<no_move>(static_cast<std::any &&>(a));
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
index 987b387..1a68488 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
index d372b71..becd198 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/floating_point_test_cases.hpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/floating_point_test_cases.hpp
index 55c61db..5ea7143 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/floating_point_test_cases.hpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/floating_point_test_cases.hpp
@@ -7,7 +7,7 @@
 #include <stdint.h>
 #include <utility>
 
-constexpr std::pair<const char*, uint64_t> floating_point_test_cases_double[] = {
+constexpr std::pair<const char*, std::uint64_t> floating_point_test_cases_double[] = {
     // Verify small exactly-representable integers:
     {"1", 0x3FF0000000000000ULL},
     {"2", 0x4000000000000000ULL},
@@ -202,7 +202,7 @@
     {"8.32116e+55", 0x4B8B2628393E02CDULL},
 };
 
-constexpr std::pair<const char*, uint32_t> floating_point_test_cases_float[] = {
+constexpr std::pair<const char*, std::uint32_t> floating_point_test_cases_float[] = {
     // Verify small exactly-representable integers:
     {"1", 0x3F800000U},
     {"2", 0x40000000U},
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.cpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.cpp
index 69e11a6..30ee9ad 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.cpp
@@ -49,12 +49,12 @@
 using namespace std;
 
 void initialize_randomness(mt19937_64& mt64, const int argc, char** const /*argv*/) {
-    constexpr size_t n = mt19937_64::state_size;
-    constexpr size_t w = mt19937_64::word_size;
+    constexpr std::size_t n = mt19937_64::state_size;
+    constexpr std::size_t w = mt19937_64::word_size;
     static_assert(w % 32 == 0);
-    constexpr size_t k = w / 32;
+    constexpr std::size_t k = w / 32;
 
-    vector<uint32_t> vec(n * k);
+    vector<std::uint32_t> vec(n * k);
 
     puts("USAGE:");
     puts("test.exe              : generates seed data from random_device.");
@@ -70,7 +70,7 @@
 
     puts("SEED DATA:");
     for (const auto& elem : vec) {
-        printf("%zu ", static_cast<size_t>(elem));
+        printf("%zu ", static_cast<std::size_t>(elem));
     }
     printf("\n");
 
@@ -103,14 +103,14 @@
     // without attempting to write to extra chars even when they're available. Finally, we also verify that we aren't
     // underrunning the buffer. This is a concern because sometimes we walk backwards when rounding.
 
-    constexpr size_t BufferPrefix = 20; // detect buffer underruns (specific value isn't important)
+    constexpr std::size_t BufferPrefix = 20; // detect buffer underruns (specific value isn't important)
 
-    constexpr size_t Space = is_integral_v<T> ? 1 + 64 // worst case: -2^63 in binary
+    constexpr std::size_t Space = is_integral_v<T> ? 1 + 64 // worst case: -2^63 in binary
                            : is_same_v<T, float>
                                ? 1 + 151 // worst case: negative min subnormal float, fixed notation
                                : 1 + 1076; // worst case: negative min subnormal double, fixed notation
 
-    constexpr size_t BufferSuffix = 30; // detect buffer overruns (specific value isn't important)
+    constexpr std::size_t BufferSuffix = 30; // detect buffer overruns (specific value isn't important)
 
     array<char, BufferPrefix + Space + BufferSuffix> buff;
 
@@ -118,12 +118,12 @@
     char* const first      = buff_begin + BufferPrefix;
     char* const buff_end   = buff_begin + buff.size();
 
-    constexpr size_t ExtraChars = 3;
+    constexpr std::size_t ExtraChars = 3;
     static_assert(ExtraChars + 10 < BufferSuffix,
         "The specific values aren't important, but there should be plenty of room to detect buffer overruns.");
 
-    for (size_t n = 0; n <= correct.size() + ExtraChars; ++n) {
-        assert(n <= static_cast<size_t>(buff_end - first));
+    for (std::size_t n = 0; n <= correct.size() + ExtraChars; ++n) {
+        assert(n <= static_cast<std::size_t>(buff_end - first));
         char* const last = first + n;
 
         buff.fill('@');
@@ -187,12 +187,12 @@
     "1t", "1u", "1v", "1w", "1x", "1y", "1z"};
 
 // https://www.wolframalpha.com : Table[BaseForm[k, n], {k, {MEOW, MEOW, MEOW}}, {n, 2, 36}]
-constexpr uint64_t stress_chunks_positive                          = 12000000345000678900ULL;
-constexpr pair<uint64_t, array<const char*, 37>> output_positive[] = {
+constexpr std::uint64_t stress_chunks_positive                          = 12000000345000678900ULL;
+constexpr pair<std::uint64_t, array<const char*, 37>> output_positive[] = {
     {123U, {{"skip0", "skip1", "1111011", "11120", "1323", "443", "323", "234", "173", "146", "123", "102", "a3", "96",
                "8b", "83", "7b", "74", "6f", "69", "63", "5i", "5d", "58", "53", "4n", "4j", "4f", "4b", "47", "43",
                "3u", "3r", "3o", "3l", "3i", "3f"}}},
-    {uint64_t{INT8_MAX}, {{"skip0", "skip1", "1111111", "11201", "1333", "1002", "331", "241", "177", "151", "127",
+    {std::uint64_t{INT8_MAX}, {{"skip0", "skip1", "1111111", "11201", "1333", "1002", "331", "241", "177", "151", "127",
                              "106", "a7", "9a", "91", "87", "7f", "78", "71", "6d", "67", "61", "5h", "5c", "57", "52",
                              "4n", "4j", "4f", "4b", "47", "43", "3v", "3s", "3p", "3m", "3j"}}},
     {161U, {{"skip0", "skip1", "10100001", "12222", "2201", "1121", "425", "320", "241", "188", "161", "137", "115",
@@ -204,7 +204,7 @@
     {1729U, {{"skip0", "skip1", "11011000001", "2101001", "123001", "23404", "12001", "5020", "3301", "2331", "1729",
                 "1332", "1001", "a30", "8b7", "7a4", "6c1", "5gc", "561", "4f0", "469", "3j7", "3cd", "364", "301",
                 "2j4", "2ed", "2a1", "25l", "21i", "1rj", "1oo", "1m1", "1jd", "1gt", "1ee", "1c1"}}},
-    {uint64_t{INT16_MAX}, {{"skip0", "skip1", "111111111111111", "1122221121", "13333333", "2022032", "411411",
+    {std::uint64_t{INT16_MAX}, {{"skip0", "skip1", "111111111111111", "1122221121", "13333333", "2022032", "411411",
                               "164350", "77777", "48847", "32767", "22689", "16b67", "11bb7", "bd27", "9a97", "7fff",
                               "6b68", "5b27", "4eeb", "41i7", "3b67", "31f9", "2flf", "28l7", "22ah", "1mc7", "1hpg",
                               "1dm7", "19rq", "16c7", "1330", "vvv", "u2v", "sbp", "qq7", "pa7"}}},
@@ -221,7 +221,7 @@
                     "1b9a06b2", "11973ba8", "9636514", "639e338", "43d49e6", "2g19gfb", "21b9d18", "19dec94", "124addi",
                     "h8f25b", "dhdfa6", "b13hg2", "8m91he", "7720j3", "5pgj58", "4pmelq", "43k17i", "3dg8ek", "2ro898",
                     "2f0et8", "23qif6", "1qw5lh", "1j7l7s", "1cdvli", "16cgrq"}}},
-    {uint64_t{INT32_MAX},
+    {std::uint64_t{INT32_MAX},
         {{"skip0", "skip1", "1111111111111111111111111111111", "12112122212110202101", "1333333333333333",
             "13344223434042", "553032005531", "104134211161", "17777777777", "5478773671", "2147483647", "a02220281",
             "4bb2308a7", "282ba4aaa", "1652ca931", "c87e66b7", "7fffffff", "53g7f548", "3928g3h1", "27c57h32",
@@ -247,7 +247,7 @@
             "4d0d5e232c53", "2d63h403i580", "1bf5h8185hdj", "kc3g550fkcg", "d41id5k9984", "8ef5n0him4g", "5i2dijfe1la",
             "3me22fm5fhi", "2hfmhgg73kd", "1ngpfabr53c", "18i7220bh11", "rm0lcjngpa", "kk1elesni1", "fgfge3c3fg",
             "bp4q5l6bjg", "8xna46jp0k", "6wejomvji5", "5di2s1qhv4"}}},
-    {uint64_t{INT64_MAX},
+    {std::uint64_t{INT64_MAX},
         {{"skip0", "skip1", "111111111111111111111111111111111111111111111111111111111111111",
             "2021110011022210012102010021220101220221", "13333333333333333333333333333333",
             "1104332401304422434310311212", "1540241003031030222122211", "22341010611245052052300",
@@ -290,8 +290,8 @@
 };
 
 // https://www.wolframalpha.com : Table[BaseForm[k, n], {k, {MEOW, MEOW, MEOW}}, {n, 2, 36}]
-constexpr int64_t stress_chunks_negative                          = -9000876000000054321LL;
-constexpr pair<int64_t, array<const char*, 37>> output_negative[] = {
+constexpr std::int64_t stress_chunks_negative                          = -9000876000000054321LL;
+constexpr pair<std::int64_t, array<const char*, 37>> output_negative[] = {
     {-85, {{"skip0", "skip1", "-1010101", "-10011", "-1111", "-320", "-221", "-151", "-125", "-104", "-85", "-78",
               "-71", "-67", "-61", "-5a", "-55", "-50", "-4d", "-49", "-45", "-41", "-3j", "-3g", "-3d", "-3a", "-37",
               "-34", "-31", "-2r", "-2p", "-2n", "-2l", "-2j", "-2h", "-2f", "-2d"}}},
@@ -360,8 +360,8 @@
         test_integer_to_chars(static_cast<T>(base * 2 - 1), base, output_max_digit[base]);
 
         for (const auto& p : output_positive) {
-            if (p.first <= static_cast<uint64_t>(numeric_limits<T>::max())) {
-                test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<size_t>(base)]);
+            if (p.first <= static_cast<std::uint64_t>(numeric_limits<T>::max())) {
+                test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<std::size_t>(base)]);
             }
         }
 
@@ -369,8 +369,8 @@
             test_integer_to_chars(static_cast<T>(-1), base, "-1");
 
             for (const auto& p : output_negative) {
-                if (p.first >= static_cast<int64_t>(numeric_limits<T>::min())) {
-                    test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<size_t>(base)]);
+                if (p.first >= static_cast<std::int64_t>(numeric_limits<T>::min())) {
+                    test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<std::size_t>(base)]);
                 }
             }
         }
@@ -382,7 +382,7 @@
 enum class TestFromCharsMode { Normal, SignalingNaN };
 
 template <typename T, typename BaseOrFmt>
-void test_from_chars(const string_view input, const BaseOrFmt base_or_fmt, const size_t correct_idx,
+void test_from_chars(const string_view input, const BaseOrFmt base_or_fmt, const std::size_t correct_idx,
     const errc correct_ec, const optional<T> opt_correct = nullopt,
     const TestFromCharsMode mode = TestFromCharsMode::Normal) {
 
@@ -402,7 +402,7 @@
     if (correct_ec == errc{} || (is_floating_point_v<T> && correct_ec == errc::result_out_of_range)) {
         if constexpr (is_floating_point_v<T>) {
             if (mode == TestFromCharsMode::Normal) {
-                using Uint = conditional_t<is_same_v<T, float>, uint32_t, uint64_t>;
+                using Uint = conditional_t<is_same_v<T, float>, std::uint32_t, std::uint64_t>;
                 assert(opt_correct.has_value());
                 assert(_Bit_cast<Uint>(dest) == _Bit_cast<Uint>(opt_correct.value()));
             } else {
@@ -543,9 +543,9 @@
     test_from_chars<int>("-2147483650", 10, 11, out_ran); // beyond risky
 }
 
-void assert_message_bits(const bool b, const char* const msg, const uint32_t bits) {
+void assert_message_bits(const bool b, const char* const msg, const std::uint32_t bits) {
     if (!b) {
-        fprintf(stderr, "%s failed for 0x%08zX\n", msg, static_cast<size_t>(bits));
+        fprintf(stderr, "%s failed for 0x%08zX\n", msg, static_cast<std::size_t>(bits));
         fprintf(stderr, "This is a randomized test.\n");
         fprintf(stderr, "DO NOT IGNORE/RERUN THIS FAILURE.\n");
         fprintf(stderr, "You must report it to the STL maintainers.\n");
@@ -553,7 +553,7 @@
     }
 }
 
-void assert_message_bits(const bool b, const char* const msg, const uint64_t bits) {
+void assert_message_bits(const bool b, const char* const msg, const std::uint64_t bits) {
     if (!b) {
         // libc++ uses long for 64-bit values.
         fprintf(stderr, "%s failed for 0x%016llX\n", msg, static_cast<unsigned long long>(bits));
@@ -564,30 +564,30 @@
     }
 }
 
-constexpr uint32_t FractionBits = 10; // Tunable for test coverage vs. performance.
+constexpr std::uint32_t FractionBits = 10; // Tunable for test coverage vs. performance.
 static_assert(FractionBits >= 1, "Must test at least 1 fraction bit.");
 static_assert(FractionBits <= 23, "There are only 23 fraction bits in a float.");
 
-constexpr uint32_t Fractions = 1U << FractionBits;
-constexpr uint32_t Mask32    = ~((1U << FractionBits) - 1U);
-constexpr uint64_t Mask64    = ~((1ULL << FractionBits) - 1ULL);
+constexpr std::uint32_t Fractions = 1U << FractionBits;
+constexpr std::uint32_t Mask32    = ~((1U << FractionBits) - 1U);
+constexpr std::uint64_t Mask64    = ~((1ULL << FractionBits) - 1ULL);
 
-constexpr uint32_t PrefixesToTest = 100; // Tunable for test coverage vs. performance.
+constexpr std::uint32_t PrefixesToTest = 100; // Tunable for test coverage vs. performance.
 static_assert(PrefixesToTest >= 1, "Must test at least 1 prefix.");
 
-constexpr uint32_t PrefixLimit = 2 // sign bit
+constexpr std::uint32_t PrefixLimit = 2 // sign bit
                                * 255 // non-INF/NAN exponents for float
                                * (1U << (23 - FractionBits)); // fraction bits in prefix
 static_assert(PrefixesToTest <= PrefixLimit, "Too many prefixes.");
 
 template <bool IsDouble>
-void test_floating_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
+void test_floating_prefix(const conditional_t<IsDouble, std::uint64_t, std::uint32_t> prefix) {
 
-    using UIntType     = conditional_t<IsDouble, uint64_t, uint32_t>;
+    using UIntType     = conditional_t<IsDouble, std::uint64_t, std::uint32_t>;
     using FloatingType = conditional_t<IsDouble, double, float>;
 
     // "-1.2345678901234567e-100" or "-1.23456789e-10"
-    constexpr size_t buffer_size = IsDouble ? 24 : 15;
+    constexpr std::size_t buffer_size = IsDouble ? 24 : 15;
     char buffer[buffer_size];
 // TODO Enable once std::from_chars has floating point support.
 #if 0
@@ -600,14 +600,14 @@
     // 1 character for a negative sign
     // + 325 (for double; 46 for float) characters in the "0.000~~~000" prefix of the min subnormal
     // + 17 (for double; 9 for float) characters for round-trip digits
-    constexpr size_t fixed_buffer_size = IsDouble ? 1 + 325 + 17 : 1 + 46 + 9;
+    constexpr std::size_t fixed_buffer_size = IsDouble ? 1 + 325 + 17 : 1 + 46 + 9;
     char fixed_buffer[fixed_buffer_size];
 
     // worst case: negative sign + max normal + null terminator
-    constexpr size_t stdio_buffer_size = 1 + (IsDouble ? 309 : 39) + 1;
+    constexpr std::size_t stdio_buffer_size = 1 + (IsDouble ? 309 : 39) + 1;
     char stdio_buffer[stdio_buffer_size];
 
-    for (uint32_t frac = 0; frac < Fractions; ++frac) {
+    for (std::uint32_t frac = 0; frac < Fractions; ++frac) {
         const UIntType bits      = prefix + frac;
         const FloatingType input = _Bit_cast<FloatingType>(bits);
 
@@ -630,7 +630,7 @@
             // Also verify that to_chars() and sprintf_s() emit the same output for integers in fixed notation.
             const auto fixed_result = to_chars(fixed_buffer, end(fixed_buffer), input, chars_format::fixed);
             assert_message_bits(fixed_result.ec == errc{}, "fixed_result.ec", bits);
-            const string_view fixed_sv(fixed_buffer, static_cast<size_t>(fixed_result.ptr - fixed_buffer));
+            const string_view fixed_sv(fixed_buffer, static_cast<std::size_t>(fixed_result.ptr - fixed_buffer));
 
             if (find(fixed_sv.begin(), fixed_sv.end(), '.') == fixed_sv.end()) {
                 const int stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.0f", input);
@@ -643,9 +643,9 @@
 }
 
 template <bool IsDouble>
-void test_floating_hex_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
+void test_floating_hex_prefix(const conditional_t<IsDouble, std::uint64_t, std::uint32_t> prefix) {
 
-    using UIntType     = conditional_t<IsDouble, uint64_t, uint32_t>;
+    using UIntType     = conditional_t<IsDouble, std::uint64_t, std::uint32_t>;
     using FloatingType = conditional_t<IsDouble, double, float>;
 
     // The precision is the number of hexits after the decimal point.
@@ -654,14 +654,14 @@
     // float explicitly stores 23 fraction bits. 23 / 4 == 5.75, so we need 6 hexits.
 
     // "-1.fffffffffffffp+1023" or "-1.fffffep+127"
-    constexpr size_t buffer_size = IsDouble ? 22 : 14;
+    constexpr std::size_t buffer_size = IsDouble ? 22 : 14;
     char buffer[buffer_size];
 // TODO Enable once std::from_chars has floating point support.
 #if 0
     FloatingType val;
 #endif
 
-    for (uint32_t frac = 0; frac < Fractions; ++frac) {
+    for (std::uint32_t frac = 0; frac < Fractions; ++frac) {
         const UIntType bits      = prefix + frac;
         const FloatingType input = _Bit_cast<FloatingType>(bits);
 
@@ -681,9 +681,9 @@
 }
 
 template <bool IsDouble>
-void test_floating_precision_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
+void test_floating_precision_prefix(const conditional_t<IsDouble, std::uint64_t, std::uint32_t> prefix) {
 
-    using UIntType     = conditional_t<IsDouble, uint64_t, uint32_t>;
+    using UIntType     = conditional_t<IsDouble, std::uint64_t, std::uint32_t>;
     using FloatingType = conditional_t<IsDouble, double, float>;
 
     // Precision for min subnormal in fixed notation. (More than enough for scientific notation.)
@@ -693,28 +693,28 @@
     constexpr int max_integer_length = IsDouble ? 309 : 39;
 
     // Size for fixed notation. (More than enough for scientific notation.)
-    constexpr size_t charconv_buffer_size = 1 // negative sign
+    constexpr std::size_t charconv_buffer_size = 1 // negative sign
                                           + max_integer_length // integer digits
                                           + 1 // decimal point
                                           + precision; // fractional digits
     char charconv_buffer[charconv_buffer_size];
 
-    constexpr size_t stdio_buffer_size = charconv_buffer_size + 1; // null terminator
+    constexpr std::size_t stdio_buffer_size = charconv_buffer_size + 1; // null terminator
     char stdio_buffer[stdio_buffer_size];
 
     // 1 character for a negative sign
     // + worst cases: 0x1.fffffffffffffp-1022 and 0x1.fffffep-126f
-    constexpr size_t general_buffer_size = 1 + (IsDouble ? 773 : 117);
+    constexpr std::size_t general_buffer_size = 1 + (IsDouble ? 773 : 117);
     char general_buffer[general_buffer_size];
     char general_stdio_buffer[general_buffer_size + 1]; // + null terminator
 
-    for (uint32_t frac = 0; frac < Fractions; ++frac) {
+    for (std::uint32_t frac = 0; frac < Fractions; ++frac) {
         const UIntType bits      = prefix + frac;
         const FloatingType input = _Bit_cast<FloatingType>(bits);
 
         auto result = to_chars(charconv_buffer, end(charconv_buffer), input, chars_format::fixed, precision);
         assert_message_bits(result.ec == errc{}, "to_chars fixed precision", bits);
-        string_view charconv_sv(charconv_buffer, static_cast<size_t>(result.ptr - charconv_buffer));
+        string_view charconv_sv(charconv_buffer, static_cast<std::size_t>(result.ptr - charconv_buffer));
 
         int stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.*f", precision, input);
         assert_message_bits(stdio_ret != -1, "sprintf_s fixed precision", bits);
@@ -725,7 +725,7 @@
 
         result = to_chars(charconv_buffer, end(charconv_buffer), input, chars_format::scientific, precision);
         assert_message_bits(result.ec == errc{}, "to_chars scientific precision", bits);
-        charconv_sv = string_view(charconv_buffer, static_cast<size_t>(result.ptr - charconv_buffer));
+        charconv_sv = string_view(charconv_buffer, static_cast<std::size_t>(result.ptr - charconv_buffer));
 
         stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.*e", precision, input);
         assert_message_bits(stdio_ret != -1, "sprintf_s scientific precision", bits);
@@ -736,7 +736,7 @@
 
         result = to_chars(general_buffer, end(general_buffer), input, chars_format::general, 5000);
         assert_message_bits(result.ec == errc{}, "to_chars general precision", bits);
-        charconv_sv = string_view(general_buffer, static_cast<size_t>(result.ptr - general_buffer));
+        charconv_sv = string_view(general_buffer, static_cast<std::size_t>(result.ptr - general_buffer));
 
         stdio_ret = sprintf_s(general_stdio_buffer, size(general_stdio_buffer), "%.5000g", input);
         assert_message_bits(stdio_ret != -1, "sprintf_s general precision", bits);
@@ -748,10 +748,10 @@
 
 void test_floating_prefixes(mt19937_64& mt64) {
     {
-        set<uint64_t> prefixes64;
+        set<std::uint64_t> prefixes64;
 
         while (prefixes64.size() < PrefixesToTest) {
-            const uint64_t val = mt64();
+            const std::uint64_t val = mt64();
 
             if ((val & 0x7FF0000000000000ULL) != 0x7FF0000000000000ULL) { // skip INF/NAN
                 prefixes64.insert(val & Mask64);
@@ -767,10 +767,10 @@
     }
 
     {
-        set<uint32_t> prefixes32;
+        set<std::uint32_t> prefixes32;
 
         while (prefixes32.size() < PrefixesToTest) {
-            const uint32_t val = static_cast<uint32_t>(mt64());
+            const std::uint32_t val = static_cast<std::uint32_t>(mt64());
 
             if ((val & 0x7F800000U) != 0x7F800000U) { // skip INF/NAN
                 prefixes32.insert(val & Mask32);
@@ -1072,7 +1072,7 @@
     const long long ms = chrono::duration_cast<chrono::milliseconds>(finish - start).count();
 
     puts("PASS");
-    printf("Randomized test cases: %zu\n", static_cast<size_t>(PrefixesToTest * Fractions));
+    printf("Randomized test cases: %zu\n", static_cast<std::size_t>(PrefixesToTest * Fractions));
     printf("Total time: %lld ms\n", ms);
 
     if (ms < 3'000) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.hpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.hpp
index 3fdc0d3..eb6d648 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.hpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.hpp
@@ -21,7 +21,7 @@
 struct FloatFromCharsTestCase {
     const char* input;
     chars_format fmt;
-    size_t correct_idx;
+    std::size_t correct_idx;
     errc correct_ec;
     float correct_value;
 };
@@ -42,7 +42,7 @@
 struct DoubleFromCharsTestCase {
     const char* input;
     chars_format fmt;
-    size_t correct_idx;
+    std::size_t correct_idx;
     errc correct_ec;
     double correct_value;
 };
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
index c1a4699..09ef70e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
@@ -10,7 +10,7 @@
 
 // to_chars requires functions in the dylib that have not been introduced in older
 // versions of the dylib on macOS.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // steady_clock requires threads.
 // UNSUPPORTED: no-threads
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.syn/chars_format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.syn/chars_format.pass.cpp
index beee526..85b78c4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.syn/chars_format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.syn/chars_format.pass.cpp
@@ -18,8 +18,9 @@
 //   general = fixed | scientific
 // };
 
-#include <charconv>
 #include <cassert>
+#include <charconv>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
index 4bdb8ca..3fc5670 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
@@ -23,26 +23,26 @@
 #include "charconv_test_helpers.h"
 
 #ifndef TEST_HAS_NO_INT128
-TEST_CONSTEXPR_CXX23 __uint128_t make_u128(__uint128_t a, uint64_t b) {
+TEST_CONSTEXPR_CXX23 __uint128_t make_u128(__uint128_t a, std::uint64_t b) {
   a *= 1000000000000000000UL;
   a *= 10;
   return a + b;
 }
 
-TEST_CONSTEXPR_CXX23 __uint128_t make_u128(__uint128_t a, uint64_t b, uint64_t c) {
+TEST_CONSTEXPR_CXX23 __uint128_t make_u128(__uint128_t a, std::uint64_t b, std::uint64_t c) {
   a *= 10000000000000ULL;
   a += b;
   a *= 10000000000000ULL;
   return a + c;
 }
 
-TEST_CONSTEXPR_CXX23 __int128_t make_i128(__int128_t a, int64_t b) {
+TEST_CONSTEXPR_CXX23 __int128_t make_i128(__int128_t a, std::int64_t b) {
   if (a < 0)
     return -make_u128(-a, b);
   return make_u128(a, b);
 }
 
-TEST_CONSTEXPR_CXX23 __int128_t make_i128(__int128_t a, __int128_t b, int64_t c) {
+TEST_CONSTEXPR_CXX23 __int128_t make_i128(__int128_t a, __int128_t b, std::int64_t c) {
   if (a < 0)
     return -make_u128(-a, b, c);
   return make_u128(a, b, c);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
index 2e60242..44fee37 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
@@ -22,10 +22,10 @@
 #include "test_macros.h"
 
 int main(int, char**) {
-  [[maybe_unused]] auto store = std::make_format_args(42, nullptr, false, 1.0);
+  [[maybe_unused]] auto store = std::make_format_args(42, nullptr, false, 'x');
 
   LIBCPP_STATIC_ASSERT(
-      std::same_as<decltype(store), std::__format_arg_store<std::format_context, int, nullptr_t, bool, double>>);
+      std::same_as<decltype(store), std::__format_arg_store<std::format_context, int, nullptr_t, bool, char>>);
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.sh.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.sh.cpp
index d36f189..0e46dbe 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.sh.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.sh.cpp
@@ -19,6 +19,7 @@
 // - otherwise, if T is char and char_type is wchar_t, initializes value with static_cast<wchar_t>(v);
 
 #include <format>
+#include <iterator>
 #include <string>
 
 void test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
index 14328a1..feb23c5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
@@ -22,10 +22,10 @@
 #include "test_macros.h"
 
 int main(int, char**) {
-  [[maybe_unused]] auto store = std::make_wformat_args(42, nullptr, false, 1.0);
+  [[maybe_unused]] auto store = std::make_wformat_args(42, nullptr, false, 'x');
 
   LIBCPP_STATIC_ASSERT(
-      std::same_as<decltype(store), std::__format_arg_store<std::wformat_context, int, nullptr_t, bool, double>>);
+      std::same_as<decltype(store), std::__format_arg_store<std::wformat_context, int, nullptr_t, bool, char>>);
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
index ea2680a..c67d868 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
@@ -8,14 +8,12 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // template<class Visitor, class Context>
 //   see below visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);
 
+#include <algorithm>
 #include <format>
 #include <cassert>
 #include <type_traits>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/ctad.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/ctad.compile.pass.cpp
new file mode 100644
index 0000000..b500b1e
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/ctad.compile.pass.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// <format>
+
+// template<class Context, class... Args>
+//   basic_format_args(format-arg-store<Context, Args...>) -> basic_format_args<Context>;
+
+#include <concepts>
+#include <format>
+
+#include "test_macros.h"
+
+void test() {
+  // Note the Standard way to create a format-arg-store is by using make_format_args.
+  static_assert(std::same_as<decltype(std::basic_format_args(std::make_format_args(42))),
+                             std::basic_format_args<std::format_context>>);
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  static_assert(std::same_as<decltype(std::basic_format_args(std::make_wformat_args(42))),
+                             std::basic_format_args<std::wformat_context>>);
+
+#endif
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
index 35bee3e..ecb055e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
@@ -8,9 +8,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // basic_format_arg<Context> get(size_t i) const noexcept;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/types.compile.pass.cpp
index 9ca1d31..4121d0b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.arguments/format.args/types.compile.pass.cpp
@@ -26,6 +26,3 @@
 static_assert(std::is_same_v<std::wformat_args,
                              std::basic_format_args<std::wformat_context>>);
 #endif
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
index e3d3c48..c2d3d6b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // class format_error;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
index 8f5404d..d51531d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
@@ -33,14 +33,14 @@
   (void)std::basic_format_string<char>{"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{0:{0}}"};
-  (void)std::basic_format_string<char, float>{"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
+  (void)std::basic_format_string<char, bool>{"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   (void)std::basic_format_string<wchar_t>{L"foo"};
   (void)std::basic_format_string<wchar_t>{L"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{0:{0}}"};
-  (void)std::basic_format_string<wchar_t, float>{L"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
+  (void)std::basic_format_string<wchar_t, bool>{L"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
 #endif
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
index bf7e2ad..d9a8c9f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
@@ -35,10 +35,10 @@
 constexpr bool test() {
   assert((std::basic_format_string<CharT>{CSTR("foo")}.get() == SV("foo")));
   assert((std::basic_format_string<CharT, int>{CSTR("{}")}.get() == SV("{}")));
-  assert((std::basic_format_string<CharT, int, float>{CSTR("{} {:01.23L}")}.get() == SV("{} {:01.23L}")));
+  assert((std::basic_format_string<CharT, int, char>{CSTR("{} {:*>6}")}.get() == SV("{} {:*>6}")));
 
   // Embedded NUL character
-  assert((std::basic_format_string<CharT, void*, double>{SV("{}\0{}")}.get() == SV("{}\0{}")));
+  assert((std::basic_format_string<CharT, void*, bool>{SV("{}\0{}")}.get() == SV("{}\0{}")));
   return true;
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
index 3ebd2bf..1ecfb5d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
@@ -29,12 +29,11 @@
 
 static_assert(std::same_as<std::format_string<>, std::basic_format_string<char>>);
 static_assert(std::same_as<std::format_string<int>, std::basic_format_string<char, int>>);
-static_assert(std::same_as<std::format_string<int, float>, std::basic_format_string<char, int, float>>);
-static_assert(std::same_as<std::format_string<int, float, void*>, std::basic_format_string<char, int, float, void*>>);
+static_assert(std::same_as<std::format_string<int, bool>, std::basic_format_string<char, int, bool>>);
+static_assert(std::same_as<std::format_string<int, bool, void*>, std::basic_format_string<char, int, bool, void*>>);
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 static_assert(std::same_as<std::wformat_string<>, std::basic_format_string<wchar_t>>);
 static_assert(std::same_as<std::wformat_string<int>, std::basic_format_string<wchar_t, int>>);
-static_assert(std::same_as<std::wformat_string<int, float>, std::basic_format_string<wchar_t, int, float>>);
-static_assert(
-    std::same_as<std::wformat_string<int, float, void*>, std::basic_format_string<wchar_t, int, float, void*>>);
+static_assert(std::same_as<std::wformat_string<int, bool>, std::basic_format_string<wchar_t, int, bool>>);
+static_assert(std::same_as<std::wformat_string<int, bool, void*>, std::basic_format_string<wchar_t, int, bool, void*>>);
 #endif
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
index b0abc2c..6957c7b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// This test uses std::filesystem::path, which is not always available
+// XFAIL: availability-filesystem-missing
+
 // <format>
 
 // template<class T, class charT>
@@ -107,9 +110,7 @@
   assert_is_formattable<__uint128_t, CharT>();
 #endif
 
-  assert_is_formattable<float, CharT>();
-  assert_is_formattable<double, CharT>();
-  assert_is_formattable<long double, CharT>();
+  // floating-point types are tested in concept.formattable.float.compile.pass.cpp
 
   assert_is_formattable<std::nullptr_t, CharT>();
   assert_is_formattable<void*, CharT>();
@@ -135,7 +136,7 @@
 
   assert_is_formattable<std::chrono::microseconds, CharT>();
 
-  assert_is_not_formattable<std::chrono::sys_time<std::chrono::microseconds>, CharT>();
+  assert_is_formattable<std::chrono::sys_time<std::chrono::microseconds>, CharT>();
   //assert_is_formattable<std::chrono::utc_time<std::chrono::microseconds>, CharT>();
   //assert_is_formattable<std::chrono::tai_time<std::chrono::microseconds>, CharT>();
   //assert_is_formattable<std::chrono::gps_time<std::chrono::microseconds>, CharT>();
@@ -161,7 +162,7 @@
   assert_is_formattable<std::chrono::year_month_weekday, CharT>();
   assert_is_formattable<std::chrono::year_month_weekday_last, CharT>();
 
-  assert_is_not_formattable<std::chrono::hh_mm_ss<std::chrono::microseconds>, CharT>();
+  assert_is_formattable<std::chrono::hh_mm_ss<std::chrono::microseconds>, CharT>();
 
   //assert_is_formattable<std::chrono::sys_info, CharT>();
   //assert_is_formattable<std::chrono::local_info, CharT>();
@@ -174,7 +175,8 @@
 // Tests for P1636 Formatters for library types
 //
 // The paper hasn't been voted in so currently all formatters are disabled.
-// TODO validate whether the test is correct after the paper has been accepted.
+// Note the paper has been abandoned, the types are kept since other papers may
+// introduce these formatters.
 template <class CharT>
 void test_P1636() {
   assert_is_not_formattable<std::basic_streambuf<CharT>, CharT>();
@@ -190,7 +192,7 @@
     assert_is_not_formattable<std::sub_match<CharT*>, CharT>();
 #endif
 #ifndef TEST_HAS_NO_THREADS
-  assert_is_not_formattable<std::thread::id, CharT>();
+  assert_is_formattable<std::thread::id, CharT>();
 #endif
   assert_is_not_formattable<std::unique_ptr<int>, CharT>();
 }
@@ -199,6 +201,12 @@
 void test_P2286_vector_bool() {
   assert_is_formattable<Vector, CharT>();
   assert_is_formattable<typename Vector::reference, CharT>();
+
+  // The const_reference shall be a bool.
+  // However libc++ uses a __bit_const_reference<vector> when
+  // _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL is defined.
+  assert_is_formattable<const Vector&, CharT>();
+  assert_is_formattable<typename Vector::const_reference, CharT>();
 }
 
 // Tests for P2286 Formatting ranges
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
new file mode 100644
index 0000000..09b957f
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// <format>
+
+// template<class T, class charT>
+// concept formattable = ...
+
+#include <concepts>
+#include <format>
+
+#include "test_macros.h"
+
+template <class T, class CharT>
+void assert_is_not_formattable() {
+  static_assert(!std::formattable<T, CharT>);
+}
+
+template <class T, class CharT>
+void assert_is_formattable() {
+  // Only formatters for CharT == char || CharT == wchar_t are enabled for the
+  // standard formatters. When CharT is a different type the formatter should
+  // be disabled.
+  if constexpr (std::same_as<CharT, char>
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+                || std::same_as<CharT, wchar_t>
+#endif
+  )
+    static_assert(std::formattable<T, CharT>);
+  else
+    assert_is_not_formattable<T, CharT>();
+}
+
+template <class CharT>
+void test() {
+  assert_is_formattable<float, CharT>();
+  assert_is_formattable<double, CharT>();
+  assert_is_formattable<long double, CharT>();
+}
+
+void test() {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+  test<char8_t>();
+  test<char16_t>();
+  test<char32_t>();
+
+  test<int>();
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/arg.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/arg.pass.cpp
index 84f328a..bb190c5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/arg.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/arg.pass.cpp
@@ -13,6 +13,7 @@
 // basic_format_arg<basic_format_context> arg(size_t id) const;
 
 #include <format>
+#include <iterator>
 #include <cassert>
 
 #include "test_basic_format_arg.h"
@@ -31,7 +32,7 @@
   const std::basic_format_context context = test_format_context_create(OutIt{output}, args);
   LIBCPP_ASSERT(args.__size() == 4);
   ASSERT_NOEXCEPT(context.arg(0));
-  for (size_t i = 0, e = args.__size(); i != e; ++i) {
+  for (std::size_t i = 0, e = args.__size(); i != e; ++i) {
     assert(context.arg(i));
   }
   assert(!context.arg(args.__size()));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/ctor.pass.cpp
index d270a86..a3ab5e4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/ctor.pass.cpp
@@ -24,6 +24,7 @@
 
 #include <format>
 #include <cassert>
+#include <iterator>
 #include <type_traits>
 
 #include "test_basic_format_arg.h"
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/locale.pass.cpp
index 06730b3..2a6b5c6 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.context/format.context/locale.pass.cpp
@@ -17,6 +17,7 @@
 // std::locale locale();
 
 #include <format>
+#include <iterator>
 #include <cassert>
 
 #include "make_string.h"
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.bool.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.bool.pass.cpp
index da886d3..c3263d0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.bool.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.bool.pass.cpp
@@ -22,6 +22,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -31,14 +32,14 @@
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT>
-void test(StringT expected, StringViewT fmt, bool arg) {
+void test(StringT expected, StringViewT fmt, bool arg, std::size_t offset) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<bool, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -60,9 +61,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.c_string.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.c_string.pass.cpp
index 1c94ca7..16b9f4b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.c_string.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.c_string.pass.cpp
@@ -21,6 +21,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -32,13 +33,13 @@
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 template <class T, class StringT, class StringViewT, class CharT>
-void test(StringT expected, StringViewT fmt, const CharT* a) {
+void test(StringT expected, StringViewT fmt, const CharT* a, std::size_t offset) {
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<T, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -60,9 +61,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test<ArgumentT>(expected, fmt, arg);
+  test<ArgumentT>(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test<ArgumentT>(expected, fmt, arg);
+  test<ArgumentT>(expected, fmt, arg, 0);
 }
 
 #if TEST_STD_VER > 20
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char.pass.cpp
index 1a228e7..ac1dfec 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char.pass.cpp
@@ -22,6 +22,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -32,14 +33,14 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class StringT, class StringViewT, class ArgumentT>
-void test(StringT expected, StringViewT fmt, ArgumentT arg) {
+void test(StringT expected, StringViewT fmt, ArgumentT arg, std::size_t offset) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArgumentT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -61,9 +62,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 #if TEST_STD_VER > 20
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp
index 4788ffe..10aaeaa 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp
@@ -21,6 +21,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -33,24 +34,25 @@
 
 // This is based on the method found in
 // clang/test/CXX/temp/temp.arg/temp.arg.nontype/p1-cxx20.cpp
-template <size_t N>
+template <std::size_t N>
 struct Tester {
   // This is not part of the real test, but is used the deduce the size of the input.
   constexpr Tester(const char (&r)[N]) { __builtin_memcpy(text, r, N); }
   char text[N];
 
   // The size of the array shouldn't include the NUL character.
-  static const size_t size = N - 1;
+  static const std::size_t size = N - 1;
 
   template <class CharT>
-  void test(const std::basic_string<CharT>& expected, const std::basic_string_view<CharT>& fmt) const {
+  void
+  test(const std::basic_string<CharT>& expected, const std::basic_string_view<CharT>& fmt, std::size_t offset) const {
     using Str = CharT[size];
     std::basic_format_parse_context<CharT> parse_ctx{fmt};
     std::formatter<Str, CharT> formatter;
     static_assert(std::semiregular<decltype(formatter)>);
 
     auto it = formatter.parse(parse_ctx);
-    assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+    assert(it == fmt.end() - offset);
 
     std::basic_string<CharT> result;
     auto out = std::back_inserter(result);
@@ -75,13 +77,13 @@
     std::basic_string_view<CharT> fmt{f};
     assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-    test(expected, fmt);
+    test(expected, fmt, 1);
     fmt.remove_suffix(1);
-    test(expected, fmt);
+    test(expected, fmt, 0);
   }
 };
 
-template <size_t N>
+template <std::size_t N>
 Tester(const char (&)[N]) -> Tester<N>;
 
 template <Tester t, class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp
deleted file mode 100644
index 624fb81..0000000
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp
+++ /dev/null
@@ -1,150 +0,0 @@
-//===----------------------------------------------------------------------===//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: libcpp-has-no-incomplete-format
-// TODO FMT Evaluate gcc-12 status
-// UNSUPPORTED: gcc-12
-
-// <format>
-
-// C++23 the formatter is a debug-enabled specialization.
-// [format.formatter.spec]:
-// Each header that declares the template `formatter` provides the following
-// enabled specializations:
-// For each `charT`, the string type specializations
-//   template<size_t N> struct formatter<const charT[N], charT>;
-
-#include <format>
-#include <cassert>
-#include <concepts>
-#include <type_traits>
-
-#include "test_format_context.h"
-#include "test_macros.h"
-#include "make_string.h"
-
-#define STR(S) MAKE_STRING(CharT, S)
-#define SV(S) MAKE_STRING_VIEW(CharT, S)
-#define CSTR(S) MAKE_CSTRING(CharT, S)
-
-// This is based on the method found in
-// clang/test/CXX/temp/temp.arg/temp.arg.nontype/p1-cxx20.cpp
-template <size_t N>
-struct Tester {
-  // This is not part of the real test, but is used the deduce the size of the input.
-  constexpr Tester(const char (&r)[N]) { __builtin_memcpy(text, r, N); }
-  char text[N];
-
-  // The size of the array shouldn't include the NUL character.
-  static const size_t size = N - 1;
-
-  template <class CharT>
-  void test(const std::basic_string<CharT>& expected,
-            const std::basic_string_view<CharT>& fmt) const {
-    using Str = const CharT[size];
-    std::basic_format_parse_context<CharT> parse_ctx{fmt};
-    std::formatter<Str, CharT> formatter;
-    static_assert(std::semiregular<decltype(formatter)>);
-
-    auto it = formatter.parse(parse_ctx);
-    assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
-
-    std::basic_string<CharT> result;
-    auto out = std::back_inserter(result);
-    using FormatCtxT = std::basic_format_context<decltype(out), CharT>;
-
-    std::basic_string<CharT> buffer{text, text + N};
-    // Note not too found of this hack
-    Str* data = reinterpret_cast<Str*>(buffer.c_str());
-
-    FormatCtxT format_ctx =
-        test_format_context_create<decltype(out), CharT>(out, std::make_format_args<FormatCtxT>(*data));
-    formatter.format(*data, format_ctx);
-    assert(result == expected);
-  }
-
-  template <class CharT>
-  void test_termination_condition(const std::basic_string<CharT>& expected,
-                                  const std::basic_string<CharT>& f) const {
-    // The format-spec is valid if completely consumed or terminates at a '}'.
-    // The valid inputs all end with a '}'. The test is executed twice:
-    // - first with the terminating '}',
-    // - second consuming the entire input.
-    std::basic_string_view<CharT> fmt{f};
-    assert(fmt.back() == CharT('}') && "Pre-condition failure");
-
-    test(expected, fmt);
-    fmt.remove_suffix(1);
-    test(expected, fmt);
-  }
-};
-
-template <size_t N>
-Tester(const char (&)[N]) -> Tester<N>;
-
-template <Tester t, class CharT>
-void test_helper_wrapper(std::basic_string<CharT> expected,
-                         std::basic_string<CharT> fmt) {
-  t.test_termination_condition(expected, fmt);
-}
-
-#if TEST_STD_VER > 20
-template <class CharT>
-constexpr bool test_set_debug_format() {
-  std::formatter<const CharT[1], CharT> formatter;
-  LIBCPP_ASSERT(formatter.__parser_.__type_ == std::__format_spec::__type::__default);
-
-  formatter.set_debug_format();
-  LIBCPP_ASSERT(formatter.__parser_.__type_ == std::__format_spec::__type::__debug);
-
-  std::basic_string_view fmt = SV("s}");
-  std::basic_format_parse_context<CharT> parse_ctx{fmt};
-  formatter.parse(parse_ctx);
-  LIBCPP_ASSERT(formatter.__parser_.__type_ == std::__format_spec::__type::__string);
-
-  formatter.set_debug_format();
-  LIBCPP_ASSERT(formatter.__parser_.__type_ == std::__format_spec::__type::__debug);
-
-  return true;
-}
-#endif
-template <class CharT>
-void test_array() {
-  test_helper_wrapper<" azAZ09,./<>?">(STR(" azAZ09,./<>?"), STR("}"));
-
-  std::basic_string<CharT> s(CSTR("abc\0abc"), 7);
-  test_helper_wrapper<"abc\0abc">(s, STR("}"));
-
-  test_helper_wrapper<"world">(STR("world"), STR("}"));
-  test_helper_wrapper<"world">(STR("world"), STR("_>}"));
-
-  test_helper_wrapper<"world">(STR("   world"), STR(">8}"));
-  test_helper_wrapper<"world">(STR("___world"), STR("_>8}"));
-  test_helper_wrapper<"world">(STR("_world__"), STR("_^8}"));
-  test_helper_wrapper<"world">(STR("world___"), STR("_<8}"));
-
-  test_helper_wrapper<"world">(STR("world"), STR(".5}"));
-  test_helper_wrapper<"universe">(STR("unive"), STR(".5}"));
-
-  test_helper_wrapper<"world">(STR("%world%"), STR("%^7.7}"));
-  test_helper_wrapper<"universe">(STR("univers"), STR("%^7.7}"));
-
-#if TEST_STD_VER > 20
-  test_set_debug_format<CharT>();
-  static_assert(test_set_debug_format<CharT>());
-#endif
-}
-
-int main(int, char**) {
-  test_array<char>();
-#ifndef TEST_HAS_NO_WIDE_CHARACTERS
-  test_array<wchar_t>();
-#endif
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
index 123d0ac..2fde253 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
@@ -8,6 +8,8 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // [format.formatter.spec]:
@@ -31,6 +33,7 @@
 #include <cmath>
 #include <charconv>
 #include <concepts>
+#include <iterator>
 #include <string>
 #include <type_traits>
 
@@ -41,13 +44,13 @@
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class CharT, class ArithmeticT>
-void test(std::basic_string_view<CharT> fmt, ArithmeticT arg, std::basic_string<CharT> expected) {
+void test(std::basic_string_view<CharT> fmt, ArithmeticT arg, std::basic_string<CharT> expected, std::size_t offset) {
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   std::basic_string<CharT> result;
   auto out = std::back_inserter(result);
@@ -75,9 +78,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(fmt, arg, expected);
+  test(fmt, arg, expected, 1);
   fmt.remove_suffix(1);
-  test(fmt, arg, expected);
+  test(fmt, arg, expected, 0);
 }
 
 template <class CharT, class ArithmeticT>
@@ -86,7 +89,7 @@
   char* end = std::to_chars(buffer.begin(), buffer.end(), value, std::chars_format::hex, 20'000).ptr;
   test_termination_condition(STR(".20000a}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000a}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -126,7 +129,7 @@
   std::transform(buffer.begin(), end, buffer.begin(), [](char c) { return std::toupper(c); });
   test_termination_condition(STR(".20000A}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000A}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -166,7 +169,7 @@
   char* end = std::to_chars(buffer.begin(), buffer.end(), value, std::chars_format::scientific, 20'000).ptr;
   test_termination_condition(STR(".20000e}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000e}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -206,7 +209,7 @@
   std::transform(buffer.begin(), end, buffer.begin(), [](char c) { return std::toupper(c); });
   test_termination_condition(STR(".20000E}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000E}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -246,7 +249,7 @@
   char* end = std::to_chars(buffer.begin(), buffer.end(), value, std::chars_format::fixed, 20'000).ptr;
   test_termination_condition(STR(".20000f}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000f}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -286,7 +289,7 @@
   std::transform(buffer.begin(), end, buffer.begin(), [](char c) { return std::toupper(c); });
   test_termination_condition(STR(".20000F}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000F}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -326,7 +329,7 @@
   char* end = std::to_chars(buffer.begin(), buffer.end(), value, std::chars_format::general, 20'000).ptr;
   test_termination_condition(STR(".20000g}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000g}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
@@ -366,7 +369,7 @@
   std::transform(buffer.begin(), end, buffer.begin(), [](char c) { return std::toupper(c); });
   test_termination_condition(STR(".20000G}"), value, std::basic_string<CharT>{buffer.begin(), end});
 
-  size_t size = buffer.end() - end;
+  std::size_t size = buffer.end() - end;
   std::fill_n(end, size, '#');
   test_termination_condition(STR("#<25000.20000G}"), value, std::basic_string<CharT>{buffer.begin(), buffer.end()});
   std::rotate(buffer.begin(), buffer.end() - (size / 2), buffer.end());
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.handle.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.handle.pass.cpp
index 1523fd3..b963232 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.handle.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.handle.pass.cpp
@@ -21,6 +21,7 @@
 #include <cmath>
 #include <charconv>
 #include <concepts>
+#include <iterator>
 #include <string>
 #include <type_traits>
 
@@ -37,13 +38,13 @@
   }
 };
 
-void test(std::string expected, std::string_view fmt, color arg) {
+void test(std::string expected, std::string_view fmt, color arg, std::size_t offset) {
   auto parse_ctx = std::format_parse_context(fmt);
   std::formatter<color, char> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   std::string result;
   auto out = std::back_inserter(result);
@@ -63,9 +64,9 @@
   std::string_view fmt{f};
   assert(fmt.back() == '}' && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.pointer.pass.cpp
index 316667a..330ac06 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.pointer.pass.cpp
@@ -26,6 +26,7 @@
 #include <cmath>
 #include <charconv>
 #include <concepts>
+#include <iterator>
 #include <string>
 #include <type_traits>
 
@@ -36,14 +37,14 @@
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class PointerT>
-void test(StringT expected, StringViewT fmt, PointerT arg) {
+void test(StringT expected, StringViewT fmt, PointerT arg, std::size_t offset) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<PointerT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -58,7 +59,7 @@
     buffer[0] = CharT('0');
     buffer[1] = CharT('x');
     expected.append(buffer.begin(),
-                    std::to_chars(buffer.begin() + 2, buffer.end(), reinterpret_cast<uintptr_t>(arg), 16).ptr);
+                    std::to_chars(buffer.begin() + 2, buffer.end(), reinterpret_cast<std::uintptr_t>(arg), 16).ptr);
   }
   assert(result == expected);
 }
@@ -73,9 +74,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 template <class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.signed_integral.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.signed_integral.pass.cpp
index 07f5be4..65caa6b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.signed_integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.signed_integral.pass.cpp
@@ -29,6 +29,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -38,14 +39,14 @@
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class ArithmeticT>
-void test(StringT expected, StringViewT fmt, ArithmeticT arg) {
+void test(StringT expected, StringViewT fmt, ArithmeticT arg, std::size_t offset) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -67,9 +68,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 template <class Arithmetic, class CharT>
@@ -87,8 +88,8 @@
     test_termination_condition(STR("2147483647"), STR("}"), A(2147483647));
   }
   if (sizeof(A) > 4) {
-    test_termination_condition(STR("-9223372036854775808"), STR("}"), A(std::numeric_limits<int64_t>::min()));
-    test_termination_condition(STR("9223372036854775807"), STR("}"), A(std::numeric_limits<int64_t>::max()));
+    test_termination_condition(STR("-9223372036854775808"), STR("}"), A(std::numeric_limits<std::int64_t>::min()));
+    test_termination_condition(STR("9223372036854775807"), STR("}"), A(std::numeric_limits<std::int64_t>::max()));
   }
 #ifndef TEST_HAS_NO_INT128
   if (sizeof(A) > 8) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.string.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.string.pass.cpp
index 994916d..3b91834 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.string.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.string.pass.cpp
@@ -23,6 +23,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "make_string.h"
@@ -34,7 +35,7 @@
 #define CSTR(S) MAKE_CSTRING(CharT, S)
 
 template <class T, class ArgumentT, class StringT, class StringViewT>
-void test(StringT expected, StringViewT fmt, StringT a) {
+void test(StringT expected, StringViewT fmt, StringT a, std::size_t offset) {
   static_assert(
       std::same_as<typename T::value_type,
                    typename std::decay_t<ArgumentT>::value_type> &&
@@ -46,7 +47,7 @@
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -69,9 +70,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test<T, ArgumentT>(expected, fmt, arg);
+  test<T, ArgumentT>(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test<T, ArgumentT>(expected, fmt, arg);
+  test<T, ArgumentT>(expected, fmt, arg, 0);
 }
 
 #if TEST_STD_VER > 20
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.unsigned_integral.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.unsigned_integral.pass.cpp
index 11025af..c413aba 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.unsigned_integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.unsigned_integral.pass.cpp
@@ -29,6 +29,7 @@
 #include <format>
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <type_traits>
 
 #include "test_format_context.h"
@@ -38,14 +39,14 @@
 #define STR(S) MAKE_STRING(CharT, S)
 
 template <class StringT, class StringViewT, class ArithmeticT>
-void test(StringT expected, StringViewT fmt, ArithmeticT arg) {
+void test(StringT expected, StringViewT fmt, ArithmeticT arg, std::size_t offset) {
   using CharT = typename StringT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<ArithmeticT, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 
   StringT result;
   auto out = std::back_inserter(result);
@@ -67,9 +68,9 @@
   std::basic_string_view<CharT> fmt{f};
   assert(fmt.back() == CharT('}') && "Pre-condition failure");
 
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 1);
   fmt.remove_suffix(1);
-  test(expected, fmt, arg);
+  test(expected, fmt, arg, 0);
 }
 
 template <class ArithmeticT, class CharT>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
index 2f45544..f106105 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // constexpr void check_arg_id(size_t id);
@@ -19,13 +16,14 @@
 #include <format>
 
 #include <cassert>
+#include <cstring>
 #include <string_view>
 
 #include "test_macros.h"
 
 constexpr bool test() {
   std::format_parse_context context("", 10);
-  for (size_t i = 0; i < 10; ++i)
+  for (std::size_t i = 0; i < 10; ++i)
     context.check_arg_id(i);
 
   return true;
@@ -39,20 +37,19 @@
       context.check_arg_id(0);
       assert(false);
     } catch ([[maybe_unused]] const std::format_error& e) {
-      LIBCPP_ASSERT(strcmp(e.what(), "Using manual argument numbering in automatic "
-                                     "argument numbering mode") == 0);
+      LIBCPP_ASSERT(std::strcmp(e.what(), "Using manual argument numbering in automatic argument numbering mode") == 0);
       return;
     }
     assert(false);
   }();
 
-  auto test_arg = [](size_t num_args) {
+  auto test_arg = [](std::size_t num_args) {
     std::format_parse_context context("", num_args);
     // Out of bounds access is valid if !std::is_constant_evaluated()
-    for (size_t i = 0; i <= num_args; ++i)
+    for (std::size_t i = 0; i <= num_args; ++i)
       context.check_arg_id(i);
   };
-  for (size_t i = 0; i < 10; ++i)
+  for (std::size_t i = 0; i < 10; ++i)
     test_arg(i);
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.verify.cpp
index 74342c7..c3f6820 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.verify.cpp
@@ -12,8 +12,6 @@
 
 #include <format>
 
-#include "test_macros.h"
-
 constexpr bool test() {
   // [format.parse.ctx]/11
   // Remarks: Call expressions where id >= num_args_ are not
@@ -24,9 +22,7 @@
   return true;
 }
 
-int main(int, char**) {
+void f() {
   // expected-error-re@+1 {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
   static_assert(test());
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
index 581defb..03da8fd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // constexpr size_t next_arg_id();
@@ -19,13 +16,14 @@
 #include <format>
 
 #include <cassert>
+#include <cstring>
 #include <string_view>
 
 #include "test_macros.h"
 
 constexpr bool test() {
-  std::format_parse_context context("");
-  for (size_t i = 0; i < 10; ++i)
+  std::format_parse_context context("", 10);
+  for (std::size_t i = 0; i < 10; ++i)
     assert(i == context.next_arg_id());
 
   return true;
@@ -39,8 +37,7 @@
     TEST_IGNORE_NODISCARD context.next_arg_id();
     assert(false);
   } catch ([[maybe_unused]] const std::format_error& e) {
-    LIBCPP_ASSERT(strcmp(e.what(), "Using automatic argument numbering in manual "
-                                   "argument numbering mode") == 0);
+    LIBCPP_ASSERT(std::strcmp(e.what(), "Using automatic argument numbering in manual argument numbering mode") == 0);
     return;
   }
   assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.verify.cpp
new file mode 100644
index 0000000..8448560
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.verify.cpp
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// constexpr size_t next_arg_id()
+
+#include <format>
+
+constexpr bool test() {
+  // [format.parse.ctx]/8
+  // Let cur-arg-id be the value of next_arg_id_ prior to this call. Call
+  // expressions where cur-arg-id >= num_args_ is true are not core constant
+  // expressions (7.7 [expr.const]).
+  std::format_parse_context context("", 0);
+  context.next_arg_id();
+
+  return true;
+}
+
+void f() {
+  // expected-error-re@+1 {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
+  static_assert(test());
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/types.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/types.compile.pass.cpp
index eaa18a4..f224dae 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/types.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/types.compile.pass.cpp
@@ -62,6 +62,3 @@
 static_assert(std::is_same_v<std::wformat_parse_context,
                              std::basic_format_parse_context<wchar_t> >);
 #endif
-
-// Required for MSVC internal test runner compatibility.
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
index 9a5baec..1b3a8e4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Tests whether a move only type can be formatted. This is required by
 // P2418R2 "Add support for std::generator-like types to std::format"
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
index 4b94ebb..1f6e052 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
@@ -11,6 +11,9 @@
 // Force unicode to be disabled.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // Tests Unicode is ignored and handled as ASCII.
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
index 329124f..bcba8e9 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Force unicode to be disabled.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
 
@@ -18,6 +21,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <list>
 #include <vector>
 
@@ -25,6 +29,7 @@
 #include "make_string.h"
 #include "test_format_string.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 #ifndef TEST_HAS_NO_LOCALIZATION
 #  include <iostream>
@@ -37,7 +42,7 @@
   {
     std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
     TEST_REQUIRE(out == expected,
-                 test_concat_message(
+                 TEST_WRITE_CONCATENATED(
                      "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
   }
 #ifndef TEST_HAS_NO_LOCALIZATION
@@ -89,12 +94,12 @@
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
       {
-        size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
+        std::size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
         assert(size == expected.size());
       }
 #ifndef TEST_HAS_NO_LOCALIZATION
       {
-        size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
+        std::size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
         assert(size == expected.size());
       }
 #endif // TEST_HAS_NO_LOCALIZATION
@@ -104,37 +109,37 @@
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
       {
-        size_t n = expected.size();
+        std::size_t n = expected.size();
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected);
       }
 #ifndef TEST_HAS_NO_LOCALIZATION
       {
-        size_t n = expected.size();
+        std::size_t n = expected.size();
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result =
             std::format_to_n(out.begin(), n, std::locale(), fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected);
       }
 #endif // TEST_HAS_NO_LOCALIZATION
       {
-        ptrdiff_t n = 0;
+        std::ptrdiff_t n = 0;
         std::basic_string<CharT> out;
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out.empty());
       }
       {
-        ptrdiff_t n = expected.size() / 2;
+        std::ptrdiff_t n = expected.size() / 2;
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected.substr(0, n));
       }
@@ -222,7 +227,7 @@
     // Unicode fitting in a 32-bit wchar_t
 
     constexpr wchar_t x  = 0x1ffff;
-    constexpr uint32_t y = 0x1ffff;
+    constexpr std::uint32_t y = 0x1ffff;
     static_assert(x == y);
 
     using V = std::basic_string_view<CharT>;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
index c940bcb..8ee7396 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
@@ -15,6 +15,12 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO FMT Fix this test using GCC, it currently crashes.
+// UNSUPPORTED: gcc-12
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // This test the debug string type for the formatter specializations for char
@@ -24,6 +30,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <list>
 #include <vector>
 
@@ -31,6 +38,7 @@
 #include "make_string.h"
 #include "test_format_string.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 #ifndef TEST_HAS_NO_LOCALIZATION
 #  include <iostream>
@@ -43,7 +51,7 @@
   {
     std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
     TEST_REQUIRE(out == expected,
-                 test_concat_message(
+                 TEST_WRITE_CONCATENATED(
                      "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
   }
 #ifndef TEST_HAS_NO_LOCALIZATION
@@ -95,12 +103,12 @@
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
       {
-        size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
+        std::size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
         assert(size == expected.size());
       }
 #ifndef TEST_HAS_NO_LOCALIZATION
       {
-        size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
+        std::size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
         assert(size == expected.size());
       }
 #endif // TEST_HAS_NO_LOCALIZATION
@@ -110,37 +118,37 @@
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
       {
-        size_t n = expected.size();
+        std::size_t n = expected.size();
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected);
       }
 #ifndef TEST_HAS_NO_LOCALIZATION
       {
-        size_t n = expected.size();
+        std::size_t n = expected.size();
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result =
             std::format_to_n(out.begin(), n, std::locale(), fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected);
       }
 #endif // TEST_HAS_NO_LOCALIZATION
       {
-        ptrdiff_t n = 0;
+        std::ptrdiff_t n = 0;
         std::basic_string<CharT> out;
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out.empty());
       }
       {
-        ptrdiff_t n = expected.size() / 2;
+        std::ptrdiff_t n = expected.size() / 2;
         std::basic_string<CharT> out(n, CharT(' '));
         std::format_to_n_result result = std::format_to_n(out.begin(), n, fmt, std::forward<Args>(args)...);
-        assert(result.size == static_cast<ptrdiff_t>(expected.size()));
+        assert(result.size == static_cast<std::ptrdiff_t>(expected.size()));
         assert(result.out == out.end());
         assert(out == expected.substr(0, n));
       }
@@ -200,14 +208,9 @@
     test_format(V{L"'\\u{600}'"}, L"{:?}", L'\x600');   // ARABIC NUMBER SIGN
     test_format(V{L"'\\u{feff}'"}, L"{:?}", L'\xfeff'); // ZERO WIDTH NO-BREAK SPACE
 
-    if constexpr (sizeof(CharT) == 2) {
-      // Incomplete surrogate pair in UTF-16
-      test_format(V{L"'\\x{d800}'"}, L"{:?}", L'\xd800'); // <surrogate-D800>
-      test_format(V{L"'\\x{dfff}'"}, L"{:?}", L'\xdfff'); // <surrogate-DFFF>
-    } else {
-      test_format(V{L"'\\u{d800}'"}, L"{:?}", L'\xd800'); // <surrogate-D800>
-      test_format(V{L"'\\u{dfff}'"}, L"{:?}", L'\xdfff'); // <surrogate-DFFF>
-    }
+    // Incomplete surrogate pair in UTF-16
+    test_format(V{L"'\\x{d800}'"}, L"{:?}", L'\xd800'); // <surrogate-D800>
+    test_format(V{L"'\\x{dfff}'"}, L"{:?}", L'\xdfff'); // <surrogate-DFFF>
 
     // Private_Use
     test_format(V{L"'\\u{e000}'"}, L"{:?}", L'\xe000'); // <private-use-E000>
@@ -228,7 +231,7 @@
     // Unicode fitting in a 32-bit wchar_t
 
     constexpr wchar_t x  = 0x1ffff;
-    constexpr uint32_t y = 0x1ffff;
+    constexpr std::uint32_t y = 0x1ffff;
     static_assert(x == y);
 
     using V = std::basic_string_view<CharT>;
@@ -275,6 +278,48 @@
     // Ill-formend UTF-8
     test_format(SV(R"(["\x{c3}"])"), SV("[{:?}]"), "\xc3");
     test_format(SV(R"(["\x{c3}("])"), SV("[{:?}]"), "\xc3\x28");
+
+    /* U+0000..U+0007F 1 code unit range, encoded in 2 code units. */
+    test_format(SV(R"(["\x{c0}\x{80}"])"), SV("[{:?}]"), "\xc0\x80"); // U+0000
+    test_format(SV(R"(["\x{c1}\x{bf}"])"), SV("[{:?}]"), "\xc1\xbf"); // U+007F
+    test_format(SV(R"(["\u{80}"])"), SV("[{:?}]"), "\xc2\x80");       // U+0080 first valid (General_Category=Control)
+
+    /* U+0000..U+07FFF 1 and 2 code unit range, encoded in 3 code units. */
+    test_format(SV(R"(["\x{e0}\x{80}\x{80}"])"), SV("[{:?}]"), "\xe0\x80\x80"); // U+0000
+    test_format(SV(R"(["\x{e0}\x{81}\x{bf}"])"), SV("[{:?}]"), "\xe0\x81\xbf"); // U+007F
+    test_format(SV(R"(["\x{e0}\x{82}\x{80}"])"), SV("[{:?}]"), "\xe0\x82\x80"); // U+0080
+    test_format(SV(R"(["\x{e0}\x{9f}\x{bf}"])"), SV("[{:?}]"), "\xe0\x9f\xbf"); // U+07FF
+    test_format(SV("[\"\u0800\"]"), SV("[{:?}]"), "\xe0\xa0\x80");              // U+0800 first valid
+
+#if 0
+	// This code point is in the Hangul Jamo Extended-B block and at the time of writing
+	// it's unassigned. When it comes defined, this branch might become true.
+    test_format(SV("[\"\ud7ff\"]"), SV("[{:?}]"), "\xed\x9f\xbf");              // U+D7FF last valid
+#else
+    /* U+D800..D+DFFFF surrogate range */
+    test_format(SV(R"(["\u{d7ff}"])"), SV("[{:?}]"), "\xed\x9f\xbf");           // U+D7FF last valid
+#endif
+    test_format(SV(R"(["\x{ed}\x{a0}\x{80}"])"), SV("[{:?}]"), "\xed\xa0\x80"); // U+D800
+    test_format(SV(R"(["\x{ed}\x{af}\x{bf}"])"), SV("[{:?}]"), "\xed\xaf\xbf"); // U+DBFF
+    test_format(SV(R"(["\x{ed}\x{bf}\x{80}"])"), SV("[{:?}]"), "\xed\xbf\x80"); // U+DC00
+    test_format(SV(R"(["\x{ed}\x{bf}\x{bf}"])"), SV("[{:?}]"), "\xed\xbf\xbf"); // U+DFFF
+    test_format(SV(R"(["\u{e000}"])"), SV("[{:?}]"), "\xee\x80\x80");           // U+E000 first valid
+                                                                                // (in the Private Use Area block)
+
+    /* U+0000..U+FFFF 1, 2, and 3 code unit range */
+    test_format(SV(R"(["\x{f0}\x{80}\x{80}\x{80}"])"), SV("[{:?}]"), "\xf0\x80\x80\x80"); // U+0000
+    test_format(SV(R"(["\x{f0}\x{80}\x{81}\x{bf}"])"), SV("[{:?}]"), "\xf0\x80\x81\xbf"); // U+007F
+    test_format(SV(R"(["\x{f0}\x{80}\x{82}\x{80}"])"), SV("[{:?}]"), "\xf0\x80\x82\x80"); // U+0080
+    test_format(SV(R"(["\x{f0}\x{80}\x{9f}\x{bf}"])"), SV("[{:?}]"), "\xf0\x80\x9f\xbf"); // U+07FF
+    test_format(SV(R"(["\x{f0}\x{80}\x{a0}\x{80}"])"), SV("[{:?}]"), "\xf0\x80\xa0\x80"); // U+0800
+    test_format(SV(R"(["\x{f0}\x{8f}\x{bf}\x{bf}"])"), SV("[{:?}]"), "\xf0\x8f\xbf\xbf"); // U+FFFF
+    test_format(SV("[\"\U00010000\"]"), SV("[{:?}]"), "\xf0\x90\x80\x80");                // U+10000 first valid
+
+    /* U+10FFFF..U+1FFFFF invalid range */
+    test_format(SV(R"(["\u{10ffff}"])"), SV("[{:?}]"), "\xf4\x8f\xbf\xbf"); // U+10FFFF last valid
+                                                                            // (in Supplementary Private Use Area-B)
+    test_format(SV(R"(["\x{f4}\x{90}\x{80}\x{80}"])"), SV("[{:?}]"), "\xf4\x90\x80\x80"); // U+110000
+    test_format(SV(R"(["\x{f4}\x{bf}\x{bf}\x{bf}"])"), SV("[{:?}]"), "\xf4\xbf\xbf\xbf"); // U+11FFFF
   } else {
     // Valid UTF-16 and UTF-32
     test_format(SV("[\"\u00c3\"]"), SV("[{:?}]"), L"\xc3"); // LATIN CAPITAL LETTER A WITH TILDE
@@ -318,11 +363,8 @@
     // Format
     test_format(V{LR"("\u{ad}\u{600}\u{feff}")"}, L"{:?}", L"\xad\x600\xfeff");
 
-    if constexpr (sizeof(CharT) == 2)
-      // Incomplete surrogate pair in UTF-16
-      test_format(V{LR"("\x{d800}")"}, L"{:?}", L"\xd800");
-    else
-      test_format(V{LR"("\u{d800}")"}, L"{:?}", L"\xd800");
+    // Incomplete surrogate pair in UTF-16
+    test_format(V{LR"("\x{d800}")"}, L"{:?}", L"\xd800");
 
     // Private_Use
     test_format(V{LR"("\u{e000}\u{f8ff}")"}, L"{:?}", L"\xe000\xf8ff");
@@ -339,7 +381,7 @@
     // Unicode fitting in a 32-bit wchar_t
 
     constexpr wchar_t x  = 0x1ffff;
-    constexpr uint32_t y = 0x1ffff;
+    constexpr std::uint32_t y = 0x1ffff;
     static_assert(x == y);
 
     using V = std::basic_string_view<CharT>;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
index ab34558..506938f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED:gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class... Args>
@@ -28,6 +30,7 @@
 #include "string_literal.h"
 #include "test_format_string.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test =
     []<class CharT, class... Args>(
@@ -35,7 +38,7 @@
       std::basic_string<CharT> out = std::format(std::locale(), fmt, std::forward<Args>(args)...);
       TEST_REQUIRE(
           out == expected,
-          test_concat_message(
+          TEST_WRITE_CONCATENATED(
               "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
     };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
index de182c7..6421376 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
index ca9d1d9..8eab255 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // Note this formatter shows additional information when tests are failing.
 // This aids the development. Since other formatters fail in the same fashion
 // they don't have this additional output.
@@ -30,6 +32,7 @@
 #include "string_literal.h"
 #include "test_format_string.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test =
     []<class CharT, class... Args>(
@@ -37,7 +40,7 @@
       std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
       TEST_REQUIRE(
           out == expected,
-          test_concat_message(
+          TEST_WRITE_CONCATENATED(
               "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
     };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
index 23c9c2c..aee8b20 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_tests.h
index 86d11f2..c798b36 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_tests.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_tests.h
@@ -154,8 +154,8 @@
   check_exception("A format-spec arg-id replacement exceeds the maximum supported value", SV("hello {:{}}"), world,
                   unsigned(-1));
   check_exception("Argument index out of bounds", SV("hello {:{}}"), world);
-  check_exception("A format-spec arg-id replacement argument isn't an integral type", SV("hello {:{}}"), world,
-                  universe);
+  check_exception(
+      "Replacement argument isn't a standard signed or unsigned integer type", SV("hello {:{}}"), world, universe);
   check_exception("Using manual argument numbering in automatic argument numbering mode", SV("hello {:{0}}"), world, 1);
   check_exception("Using automatic argument numbering in manual argument numbering mode", SV("hello {0:{}}"), world, 1);
   // Arg-id may not have leading zeros.
@@ -178,8 +178,8 @@
   check_exception("A format-spec arg-id replacement exceeds the maximum supported value", SV("hello {:.{}}"), world,
                   ~0u);
   check_exception("Argument index out of bounds", SV("hello {:.{}}"), world);
-  check_exception("A format-spec arg-id replacement argument isn't an integral type", SV("hello {:.{}}"), world,
-                  universe);
+  check_exception(
+      "Replacement argument isn't a standard signed or unsigned integer type", SV("hello {:.{}}"), world, universe);
   check_exception("Using manual argument numbering in automatic argument numbering mode", SV("hello {:.{0}}"), world,
                   1);
   check_exception("Using automatic argument numbering in manual argument numbering mode", SV("hello {0:.{}}"), world,
@@ -662,28 +662,28 @@
 #ifndef TEST_HAS_NO_INT128
   format_test_integer<__int128_t, CharT>(check, check_exception);
 #endif
-  // *** check the minma and maxima ***
-  check(SV("-0b10000000"), SV("{:#b}"), std::numeric_limits<int8_t>::min());
-  check(SV("-0200"), SV("{:#o}"), std::numeric_limits<int8_t>::min());
-  check(SV("-128"), SV("{:#}"), std::numeric_limits<int8_t>::min());
-  check(SV("-0x80"), SV("{:#x}"), std::numeric_limits<int8_t>::min());
+  // *** check the minima and maxima ***
+  check(SV("-0b10000000"), SV("{:#b}"), std::numeric_limits<std::int8_t>::min());
+  check(SV("-0200"), SV("{:#o}"), std::numeric_limits<std::int8_t>::min());
+  check(SV("-128"), SV("{:#}"), std::numeric_limits<std::int8_t>::min());
+  check(SV("-0x80"), SV("{:#x}"), std::numeric_limits<std::int8_t>::min());
 
-  check(SV("-0b1000000000000000"), SV("{:#b}"), std::numeric_limits<int16_t>::min());
-  check(SV("-0100000"), SV("{:#o}"), std::numeric_limits<int16_t>::min());
-  check(SV("-32768"), SV("{:#}"), std::numeric_limits<int16_t>::min());
-  check(SV("-0x8000"), SV("{:#x}"), std::numeric_limits<int16_t>::min());
+  check(SV("-0b1000000000000000"), SV("{:#b}"), std::numeric_limits<std::int16_t>::min());
+  check(SV("-0100000"), SV("{:#o}"), std::numeric_limits<std::int16_t>::min());
+  check(SV("-32768"), SV("{:#}"), std::numeric_limits<std::int16_t>::min());
+  check(SV("-0x8000"), SV("{:#x}"), std::numeric_limits<std::int16_t>::min());
 
-  check(SV("-0b10000000000000000000000000000000"), SV("{:#b}"), std::numeric_limits<int32_t>::min());
-  check(SV("-020000000000"), SV("{:#o}"), std::numeric_limits<int32_t>::min());
-  check(SV("-2147483648"), SV("{:#}"), std::numeric_limits<int32_t>::min());
-  check(SV("-0x80000000"), SV("{:#x}"), std::numeric_limits<int32_t>::min());
+  check(SV("-0b10000000000000000000000000000000"), SV("{:#b}"), std::numeric_limits<std::int32_t>::min());
+  check(SV("-020000000000"), SV("{:#o}"), std::numeric_limits<std::int32_t>::min());
+  check(SV("-2147483648"), SV("{:#}"), std::numeric_limits<std::int32_t>::min());
+  check(SV("-0x80000000"), SV("{:#x}"), std::numeric_limits<std::int32_t>::min());
 
   check(SV("-0b1000000000000000000000000000000000000000000000000000000000000000"),
         SV("{:#b}"),
-        std::numeric_limits<int64_t>::min());
-  check(SV("-01000000000000000000000"), SV("{:#o}"), std::numeric_limits<int64_t>::min());
-  check(SV("-9223372036854775808"), SV("{:#}"), std::numeric_limits<int64_t>::min());
-  check(SV("-0x8000000000000000"), SV("{:#x}"), std::numeric_limits<int64_t>::min());
+        std::numeric_limits<std::int64_t>::min());
+  check(SV("-01000000000000000000000"), SV("{:#o}"), std::numeric_limits<std::int64_t>::min());
+  check(SV("-9223372036854775808"), SV("{:#}"), std::numeric_limits<std::int64_t>::min());
+  check(SV("-0x8000000000000000"), SV("{:#x}"), std::numeric_limits<std::int64_t>::min());
 
 #ifndef TEST_HAS_NO_INT128
   check(SV("-0b1000000000000000000000000000000000000000000000000000000000000000"
@@ -695,27 +695,27 @@
   check(SV("-0x80000000000000000000000000000000"), SV("{:#x}"), std::numeric_limits<__int128_t>::min());
 #endif
 
-  check(SV("0b1111111"), SV("{:#b}"), std::numeric_limits<int8_t>::max());
-  check(SV("0177"), SV("{:#o}"), std::numeric_limits<int8_t>::max());
-  check(SV("127"), SV("{:#}"), std::numeric_limits<int8_t>::max());
-  check(SV("0x7f"), SV("{:#x}"), std::numeric_limits<int8_t>::max());
+  check(SV("0b1111111"), SV("{:#b}"), std::numeric_limits<std::int8_t>::max());
+  check(SV("0177"), SV("{:#o}"), std::numeric_limits<std::int8_t>::max());
+  check(SV("127"), SV("{:#}"), std::numeric_limits<std::int8_t>::max());
+  check(SV("0x7f"), SV("{:#x}"), std::numeric_limits<std::int8_t>::max());
 
-  check(SV("0b111111111111111"), SV("{:#b}"), std::numeric_limits<int16_t>::max());
-  check(SV("077777"), SV("{:#o}"), std::numeric_limits<int16_t>::max());
-  check(SV("32767"), SV("{:#}"), std::numeric_limits<int16_t>::max());
-  check(SV("0x7fff"), SV("{:#x}"), std::numeric_limits<int16_t>::max());
+  check(SV("0b111111111111111"), SV("{:#b}"), std::numeric_limits<std::int16_t>::max());
+  check(SV("077777"), SV("{:#o}"), std::numeric_limits<std::int16_t>::max());
+  check(SV("32767"), SV("{:#}"), std::numeric_limits<std::int16_t>::max());
+  check(SV("0x7fff"), SV("{:#x}"), std::numeric_limits<std::int16_t>::max());
 
-  check(SV("0b1111111111111111111111111111111"), SV("{:#b}"), std::numeric_limits<int32_t>::max());
-  check(SV("017777777777"), SV("{:#o}"), std::numeric_limits<int32_t>::max());
-  check(SV("2147483647"), SV("{:#}"), std::numeric_limits<int32_t>::max());
-  check(SV("0x7fffffff"), SV("{:#x}"), std::numeric_limits<int32_t>::max());
+  check(SV("0b1111111111111111111111111111111"), SV("{:#b}"), std::numeric_limits<std::int32_t>::max());
+  check(SV("017777777777"), SV("{:#o}"), std::numeric_limits<std::int32_t>::max());
+  check(SV("2147483647"), SV("{:#}"), std::numeric_limits<std::int32_t>::max());
+  check(SV("0x7fffffff"), SV("{:#x}"), std::numeric_limits<std::int32_t>::max());
 
   check(SV("0b111111111111111111111111111111111111111111111111111111111111111"),
         SV("{:#b}"),
-        std::numeric_limits<int64_t>::max());
-  check(SV("0777777777777777777777"), SV("{:#o}"), std::numeric_limits<int64_t>::max());
-  check(SV("9223372036854775807"), SV("{:#}"), std::numeric_limits<int64_t>::max());
-  check(SV("0x7fffffffffffffff"), SV("{:#x}"), std::numeric_limits<int64_t>::max());
+        std::numeric_limits<std::int64_t>::max());
+  check(SV("0777777777777777777777"), SV("{:#o}"), std::numeric_limits<std::int64_t>::max());
+  check(SV("9223372036854775807"), SV("{:#}"), std::numeric_limits<std::int64_t>::max());
+  check(SV("0x7fffffffffffffff"), SV("{:#x}"), std::numeric_limits<std::int64_t>::max());
 
 #ifndef TEST_HAS_NO_INT128
   check(SV("0b111111111111111111111111111111111111111111111111111111111111111"
@@ -739,27 +739,27 @@
   format_test_integer<__uint128_t, CharT>(check, check_exception);
 #endif
   // *** test the maxima ***
-  check(SV("0b11111111"), SV("{:#b}"), std::numeric_limits<uint8_t>::max());
-  check(SV("0377"), SV("{:#o}"), std::numeric_limits<uint8_t>::max());
-  check(SV("255"), SV("{:#}"), std::numeric_limits<uint8_t>::max());
-  check(SV("0xff"), SV("{:#x}"), std::numeric_limits<uint8_t>::max());
+  check(SV("0b11111111"), SV("{:#b}"), std::numeric_limits<std::uint8_t>::max());
+  check(SV("0377"), SV("{:#o}"), std::numeric_limits<std::uint8_t>::max());
+  check(SV("255"), SV("{:#}"), std::numeric_limits<std::uint8_t>::max());
+  check(SV("0xff"), SV("{:#x}"), std::numeric_limits<std::uint8_t>::max());
 
-  check(SV("0b1111111111111111"), SV("{:#b}"), std::numeric_limits<uint16_t>::max());
-  check(SV("0177777"), SV("{:#o}"), std::numeric_limits<uint16_t>::max());
-  check(SV("65535"), SV("{:#}"), std::numeric_limits<uint16_t>::max());
-  check(SV("0xffff"), SV("{:#x}"), std::numeric_limits<uint16_t>::max());
+  check(SV("0b1111111111111111"), SV("{:#b}"), std::numeric_limits<std::uint16_t>::max());
+  check(SV("0177777"), SV("{:#o}"), std::numeric_limits<std::uint16_t>::max());
+  check(SV("65535"), SV("{:#}"), std::numeric_limits<std::uint16_t>::max());
+  check(SV("0xffff"), SV("{:#x}"), std::numeric_limits<std::uint16_t>::max());
 
-  check(SV("0b11111111111111111111111111111111"), SV("{:#b}"), std::numeric_limits<uint32_t>::max());
-  check(SV("037777777777"), SV("{:#o}"), std::numeric_limits<uint32_t>::max());
-  check(SV("4294967295"), SV("{:#}"), std::numeric_limits<uint32_t>::max());
-  check(SV("0xffffffff"), SV("{:#x}"), std::numeric_limits<uint32_t>::max());
+  check(SV("0b11111111111111111111111111111111"), SV("{:#b}"), std::numeric_limits<std::uint32_t>::max());
+  check(SV("037777777777"), SV("{:#o}"), std::numeric_limits<std::uint32_t>::max());
+  check(SV("4294967295"), SV("{:#}"), std::numeric_limits<std::uint32_t>::max());
+  check(SV("0xffffffff"), SV("{:#x}"), std::numeric_limits<std::uint32_t>::max());
 
   check(SV("0b1111111111111111111111111111111111111111111111111111111111111111"),
         SV("{:#b}"),
-        std::numeric_limits<uint64_t>::max());
-  check(SV("01777777777777777777777"), SV("{:#o}"), std::numeric_limits<uint64_t>::max());
-  check(SV("18446744073709551615"), SV("{:#}"), std::numeric_limits<uint64_t>::max());
-  check(SV("0xffffffffffffffff"), SV("{:#x}"), std::numeric_limits<uint64_t>::max());
+        std::numeric_limits<std::uint64_t>::max());
+  check(SV("01777777777777777777777"), SV("{:#o}"), std::numeric_limits<std::uint64_t>::max());
+  check(SV("18446744073709551615"), SV("{:#}"), std::numeric_limits<std::uint64_t>::max());
+  check(SV("0xffffffffffffffff"), SV("{:#x}"), std::numeric_limits<std::uint64_t>::max());
 
 #ifndef TEST_HAS_NO_INT128
   check(SV("0b1111111111111111111111111111111111111111111111111111111111111111"
@@ -2367,6 +2367,7 @@
 
   // *** alternate form **
   // When precision is zero there's no decimal point except when the alternate form is specified.
+  // Note unlike the g and G option the trailing zeros are still removed.
   check(SV("answer is '0'"), SV("answer is '{:.0}'"), F(0));
   check(SV("answer is '0.'"), SV("answer is '{:#.0}'"), F(0));
 
@@ -2449,6 +2450,57 @@
   // See locale-specific_form.pass.cpp
 }
 
+template <class F, class CharT, class TestFunction>
+void format_test_floating_point_PR58714(TestFunction check) {
+  check(SV("+1234"), SV("{:+}"), F(1234.0));
+  check(SV("+1.348p+10"), SV("{:+a}"), F(1234.0));
+  check(SV("+1.234000e+03"), SV("{:+e}"), F(1234.0));
+  check(SV("+1234.000000"), SV("{:+f}"), F(1234.0));
+  check(SV("+1234"), SV("{:+g}"), F(1234.0));
+
+  check(SV("1234."), SV("{:#}"), F(1234.0));
+  check(SV("1.348p+10"), SV("{:#a}"), F(1234.0));
+  check(SV("1.234000e+03"), SV("{:#e}"), F(1234.0));
+  check(SV("1234.000000"), SV("{:#f}"), F(1234.0));
+  check(SV("1234.00"), SV("{:#g}"), F(1234.0));
+
+  check(SV("4.e+30"), SV("{:#}"), F(4.0e+30));
+  check(SV("1.p+102"), SV("{:#a}"), F(0x4.0p+100));
+  check(SV("4.000000e+30"), SV("{:#e}"), F(4.0e+30));
+  check(SV("5070602400912917605986812821504.000000"), SV("{:#f}"), F(0x4.0p+100));
+  check(SV("4.00000e+30"), SV("{:#g}"), F(4.0e+30));
+
+  check(SV("1234."), SV("{:#.6}"), F(1234.0)); // # does not restore zeros
+  check(SV("1.348000p+10"), SV("{:#.6a}"), F(1234.0));
+  check(SV("1.234000e+03"), SV("{:#.6e}"), F(1234.0));
+  check(SV("1234.000000"), SV("{:#.6f}"), F(1234.0));
+  check(SV("1234.00"), SV("{:#.6g}"), F(1234.0));
+
+  check(SV("-1234."), SV("{:#}"), F(-1234.0));
+  check(SV("-1.348p+10"), SV("{:#a}"), F(-1234.0));
+  check(SV("-1.234000e+03"), SV("{:#e}"), F(-1234.0));
+  check(SV("-1234.000000"), SV("{:#f}"), F(-1234.0));
+  check(SV("-1234.00"), SV("{:#g}"), F(-1234.0));
+
+  check(SV("-1234."), SV("{:#.6}"), F(-1234.0)); // # does not restore zeros
+  check(SV("-1.348000p+10"), SV("{:#.6a}"), F(-1234.0));
+  check(SV("-1.234000e+03"), SV("{:#.6e}"), F(-1234.0));
+  check(SV("-1234.000000"), SV("{:#.6f}"), F(-1234.0));
+  check(SV("-1234.00"), SV("{:#.6g}"), F(-1234.0));
+
+  check(SV("+1234."), SV("{:+#}"), F(1234.0));
+  check(SV("+1.348p+10"), SV("{:+#a}"), F(1234.0));
+  check(SV("+1.234000e+03"), SV("{:+#e}"), F(1234.0));
+  check(SV("+1234.000000"), SV("{:+#f}"), F(1234.0));
+  check(SV("+1234.00"), SV("{:+#g}"), F(1234.0));
+
+  check(SV("+1234."), SV("{:+#.6}"), F(1234.0)); // # does not restore zeros
+  check(SV("+1.348000p+10"), SV("{:+#.6a}"), F(1234.0));
+  check(SV("+1.234000e+03"), SV("{:+#.6e}"), F(1234.0));
+  check(SV("+1234.000000"), SV("{:+#.6f}"), F(1234.0));
+  check(SV("+1234.00"), SV("{:+#.6g}"), F(1234.0));
+}
+
 template <class F, class CharT, class TestFunction, class ExceptionTest>
 void format_test_floating_point(TestFunction check, ExceptionTest check_exception) {
   format_test_floating_point_hex_lower_case<F, CharT>(check);
@@ -2468,6 +2520,8 @@
   format_test_floating_point_default<F, CharT>(check);
   format_test_floating_point_default_precision<F, CharT>(check);
 
+  format_test_floating_point_PR58714<F, CharT>(check);
+
   // *** type ***
   for (const auto& fmt : invalid_types<CharT>("aAeEfFgG"))
     check_exception("The format-spec type has a type not supported for a floating-point argument", fmt, F(1));
@@ -2617,6 +2671,10 @@
 
   check(SV("{"), SV("{{"));
   check(SV("}"), SV("}}"));
+  check(SV("{:^}"), SV("{{:^}}"));
+  check(SV("{: ^}"), SV("{{:{}^}}"), CharT(' '));
+  check(SV("{:{}^}"), SV("{{:{{}}^}}"));
+  check(SV("{:{ }^}"), SV("{{:{{{}}}^}}"), CharT(' '));
 
   // *** Test argument ID ***
   check(SV("hello false true"), SV("hello {0:} {1:}"), false, true);
@@ -2669,7 +2727,6 @@
   check_exception("The format string contains an invalid escape sequence", SV("{:}-}"), 42);
 
   check_exception("The format string contains an invalid escape sequence", SV("} "));
-
   check_exception("The arg-id of the format-spec starts with an invalid character", SV("{-"), 42);
   check_exception("Argument index out of bounds", SV("hello {}"));
   check_exception("Argument index out of bounds", SV("hello {0}"));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
index f497e2d..af87108 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out, class... Args>
@@ -23,6 +25,7 @@
 #include <format>
 #include <algorithm>
 #include <cassert>
+#include <iterator>
 #include <list>
 #include <vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
index e399060..c06a8ef 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
index 90615f7..7a97f55 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out, class... Args>
@@ -20,6 +22,7 @@
 #include <format>
 #include <algorithm>
 #include <cassert>
+#include <iterator>
 #include <list>
 #include <vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
index a40b532..43fee3f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // Basic test to validate ill-formed code is properly detected.
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
index 8a9a539..80d1a6c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out, class... Args>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
index ec4e292..a4c7aad 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
index 8ce91da..b0ca148 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out, class... Args>
@@ -22,6 +24,7 @@
 #include <format>
 #include <algorithm>
 #include <cassert>
+#include <iterator>
 #include <list>
 #include <vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
index 7c064c5..51abc5b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
index 625b99f..47ca522 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class... Args>
@@ -32,7 +34,7 @@
 auto test =
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) constexpr {
-      size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
+      std::size_t size = std::formatted_size(std::locale(), fmt, std::forward<Args>(args)...);
       assert(size == expected.size());
     };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
index dc80c12..3e32f84 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
index 6a627ec..d1d2330 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class... Args>
@@ -29,7 +31,7 @@
 auto test =
     []<class CharT, class... Args>(
         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) constexpr {
-      size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
+      std::size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
       assert(size == expected.size());
     };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
index 1662d89..2bd0e62 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
index 86d56da..6cf6931 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
@@ -12,6 +12,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // REQUIRES: locale.en_US.UTF-8
 
 // <format>
@@ -94,6 +96,7 @@
 #include "string_literal.h"
 #include "test_format_string.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 #define STR(S) MAKE_STRING(CharT, S)
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
@@ -129,7 +132,7 @@
   {
     std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
     TEST_REQUIRE(out == expected,
-                 test_concat_message(
+                 TEST_WRITE_CONCATENATED(
                      "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
   }
   // *** vformat ***
@@ -164,7 +167,7 @@
   }
   // *** formatted_size ***
   {
-    size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
+    std::size_t size = std::formatted_size(fmt, std::forward<Args>(args)...);
     assert(size == expected.size());
   }
 }
@@ -214,7 +217,7 @@
   }
   // *** formatted_size ***
   {
-    size_t size = std::formatted_size(loc, fmt, std::forward<Args>(args)...);
+    std::size_t size = std::formatted_size(loc, fmt, std::forward<Args>(args)...);
     assert(size == expected.size());
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
index db659f5..a5c5fdb 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
@@ -15,6 +15,9 @@
 // UNSUPPORTED msvc, target={{.+}}-windows-gnu
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // Tests the Unicode width support of the standard format specifiers.
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
index 90c56df..dd6c24e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // string vformat(const locale& loc, string_view fmt, format_args args);
@@ -24,13 +26,14 @@
 #include "format_tests.h"
 #include "string_literal.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
   std::basic_string<CharT> out = std::vformat(std::locale(), fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -38,19 +41,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(std::locale(), fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch ([[maybe_unused]] const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(std::locale(), fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
index 236d83e..a6aa38d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // string vformat(string_view fmt, format_args args);
@@ -23,13 +25,14 @@
 #include "format_tests.h"
 #include "string_literal.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -37,20 +40,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch ([[maybe_unused]] const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
index 993f19a..8aecf7b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
@@ -11,6 +11,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out>
@@ -26,7 +28,8 @@
 #include <list>
 #include <vector>
 
-#include "test_macros.h"
+#include "assert_macros.h"
+#include "concat_macros.h"
 #include "format_tests.h"
 #include "string_literal.h"
 
@@ -58,23 +61,22 @@
   }
 };
 
-auto test_exception =
-    []<class CharT, class... Args>(
-        [[maybe_unused]] std::string_view what,
-        [[maybe_unused]] std::basic_string_view<CharT> fmt,
-        [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
+auto test_exception = []<class CharT, class... Args>([[maybe_unused]] std::string_view what,
+                                                     [[maybe_unused]] std::basic_string_view<CharT> fmt,
+                                                     [[maybe_unused]] Args&&... args) {
+  TEST_VALIDATE_EXCEPTION(
+      std::format_error,
+      [&]([[maybe_unused]] const std::format_error& e) {
+        TEST_LIBCPP_REQUIRE(
+            e.what() == what,
+            TEST_WRITE_CONCATENATED(
+                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+      },
+      [&] {
         std::basic_string<CharT> out;
         std::vformat_to(std::back_inserter(out), std::locale(), fmt, std::make_format_args<context_t<CharT>>(args...));
-        assert(false);
-      } catch ([[maybe_unused]] const std::format_error& e) {
-        LIBCPP_ASSERT(e.what() == what);
-        return;
-      }
-      assert(false);
-#endif
-    };
+      }());
+};
 
 int main(int, char**) {
   format_tests<char, execution_modus::partial>(test, test_exception);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
index 0574d49..3be94e5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
@@ -10,6 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// XFAIL: availability-fp_to_chars-missing
+
 // <format>
 
 // template<class Out>
@@ -23,6 +25,8 @@
 #include <list>
 #include <vector>
 
+#include "assert_macros.h"
+#include "concat_macros.h"
 #include "test_macros.h"
 #include "format_tests.h"
 #include "string_literal.h"
@@ -60,17 +64,18 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        std::basic_string<CharT> out;
-        std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...));
-        assert(false);
-      } catch ([[maybe_unused]] const std::format_error& e) {
-        LIBCPP_ASSERT(e.what() == what);
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          [&] {
+            std::basic_string<CharT> out;
+            std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...));
+          }());
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
new file mode 100644
index 0000000..9c29722
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
@@ -0,0 +1,111 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   struct range-default-formatter<range_format::sequence, R, charT>
+
+// template<class FormatContext>
+//   typename FormatContext::iterator
+//     format(maybe-const-r& elems, FormatContext& ctx) const;
+
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <format>
+#include <iterator>
+
+#include "assert_macros.h"
+#include "format.functions.common.h"
+#include "test_format_context.h"
+#include "test_macros.h"
+#include "make_string.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class StringViewT>
+void test_format(StringViewT expected, std::array<int, 2> arg) {
+  using CharT      = typename StringViewT::value_type;
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+
+  std::formatter<std::array<int, 2>, CharT> formatter;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+  formatter.format(arg, format_ctx);
+  assert(result == expected);
+}
+
+template <class CharT>
+void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::array<parse_call_validator, 2> arg;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  std::formatter<decltype(arg), CharT> formatter;
+  std::basic_format_parse_context<CharT> ctx{fmt};
+
+  formatter.parse(ctx);
+  formatter.format(arg, format_ctx);
+}
+
+template <class CharT>
+void test_assure_parse_is_called() {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::array<parse_call_validator, 2> arg;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  { // parse not called
+    [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
+    TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
+  }
+
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("n"));
+  test_assure_parse_is_called(SV("5n"));
+}
+
+template <class CharT>
+void test_fmt() {
+  test_format(SV("[1, 42]"), std::array<int, 2>{{1, 42}});
+  test_format(SV("[0, 99]"), std::array<int, 2>{{0, 99}});
+
+  test_assure_parse_is_called<CharT>();
+}
+
+void test() {
+  test_fmt<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_fmt<wchar_t>();
+#endif
+}
+
+int main(int, char**) {
+  test();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp
new file mode 100644
index 0000000..f66ef7b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp
@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   struct range-default-formatter<range_format::sequence, R, charT>
+
+// template<class ParseContext>
+//   constexpr typename ParseContext::iterator
+//     parse(ParseContext& ctx);
+
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <format>
+
+#include "test_format_context.h"
+#include "test_macros.h"
+#include "make_string.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class StringViewT>
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
+  using CharT    = typename StringViewT::value_type;
+  auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
+  std::formatter<std::array<int, 2>, CharT> formatter;
+  static_assert(std::semiregular<decltype(formatter)>);
+
+  std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
+  assert(it == fmt.end() - offset);
+}
+
+template <class CharT>
+constexpr void test_fmt() {
+  test_parse(SV(""), 0);
+  test_parse(SV(":5"), 0);
+
+  test_parse(SV("}"), 1);
+  test_parse(SV(":5}"), 1);
+}
+
+constexpr bool test() {
+  test_fmt<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_fmt<wchar_t>();
+#endif
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
new file mode 100644
index 0000000..c17edb2
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   struct range-default-formatter<range_format::sequence, R, charT>
+
+// constexpr void constexpr void set_brackets(basic_string_view<charT> opening,
+//                                            basic_string_view<charT> closing) noexcept;
+
+#include <format>
+#include <cassert>
+#include <iterator>
+#include <type_traits>
+#include <vector>
+
+#include "make_string.h"
+#include "test_format_context.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT>
+constexpr void test_setter() {
+  std::formatter<std::vector<int>, CharT> formatter;
+  formatter.set_brackets(SV("open"), SV("close"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_brackets(std::basic_string_view<CharT>{}, std::basic_string_view<CharT>{})));
+
+  // Note there is no direct way to validate this function modified the object.
+  if (!std::is_constant_evaluated()) {
+    using String     = std::basic_string<CharT>;
+    using OutIt      = std::back_insert_iterator<String>;
+    using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+
+    String result;
+    OutIt out             = std::back_inserter(result);
+    FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>());
+    formatter.format(std::vector<int>{0, 42, 99}, format_ctx);
+    assert(result == SV("open0, 42, 99close"));
+  }
+}
+
+constexpr bool test() {
+  test_setter<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_setter<wchar_t>();
+#endif
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
new file mode 100644
index 0000000..3f91e7b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
@@ -0,0 +1,67 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   struct range-default-formatter<range_format::sequence, R, charT>
+
+// constexpr void set_separator(basic_string_view<charT> sep) noexcept;
+
+#include <format>
+#include <cassert>
+#include <iterator>
+#include <type_traits>
+#include <vector>
+
+#include "make_string.h"
+#include "test_format_context.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT>
+constexpr void test_setter() {
+  std::formatter<std::vector<int>, CharT> formatter;
+  formatter.set_separator(SV("sep"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_separator(std::basic_string_view<CharT>{})));
+
+  // Note there is no direct way to validate this function modified the object.
+  if (!std::is_constant_evaluated()) {
+    using String     = std::basic_string<CharT>;
+    using OutIt      = std::back_insert_iterator<String>;
+    using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+
+    String result;
+    OutIt out             = std::back_inserter(result);
+    FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>());
+    formatter.format(std::vector<int>{0, 42, 99}, format_ctx);
+    assert(result == SV("[0sep42sep99]"));
+  }
+}
+
+constexpr bool test() {
+  test_setter<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_setter<wchar_t>();
+#endif
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
index d343ad1..9a0c155 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// This test uses std::filesystem::path, which is not always available
+// XFAIL: availability-filesystem-missing
+
 // <format>
 
 // template<ranges::input_range R>
@@ -47,7 +50,7 @@
   struct iterator {
     using iterator_concept = std::input_iterator_tag;
     using value_type       = recursive_range;
-    using difference_type  = ptrdiff_t;
+    using difference_type  = std::ptrdiff_t;
     using reference        = recursive_range;
 
     reference operator*() const;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
index b2e65ec..2dcdfc8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -32,13 +30,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.tests.h
index 005a2bd..3aa8953 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.tests.h
@@ -26,20 +26,20 @@
 void test_char(TestFunction check, ExceptionTest check_exception) {
   std::map<CharT, CharT> input{{CharT('a'), CharT('A')}, {CharT('c'), CharT('C')}, {CharT('b'), CharT('B')}};
 
-  check(SV("{a: A, b: B, c: C}"), SV("{}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{}"), input);
 
   // ***** underlying has no format-spec
 
   // *** align-fill & width ***
-  check(SV("{a: A, b: B, c: C}     "), SV("{:23}"), input);
-  check(SV("{a: A, b: B, c: C}*****"), SV("{:*<23}"), input);
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^23}"), input);
-  check(SV("#####{a: A, b: B, c: C}"), SV("{:#>23}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}     "), SV("{:35}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}*****"), SV("{:*<35}"), input);
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^35}"), input);
+  check(SV("#####{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{:#>35}"), input);
 
-  check(SV("{a: A, b: B, c: C}     "), SV("{:{}}"), input, 23);
-  check(SV("{a: A, b: B, c: C}*****"), SV("{:*<{}}"), input, 23);
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^{}}"), input, 23);
-  check(SV("#####{a: A, b: B, c: C}"), SV("{:#>{}}"), input, 23);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}     "), SV("{:{}}"), input, 35);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}*****"), SV("{:*<{}}"), input, 35);
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^{}}"), input, 35);
+  check(SV("#####{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{:#>{}}"), input, 35);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -63,10 +63,10 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** n
-  check(SV("__a: A, b: B, c: C___"), SV("{:_^21n}"), input);
+  check(SV("__'a': 'A', 'b': 'B', 'c': 'C'___"), SV("{:_^33n}"), input);
 
   // *** type ***
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^23m}"), input); // the m type does the same as the default.
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^35m}"), input); // the m type does the same as the default.
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
@@ -134,20 +134,20 @@
   std::map<char, char> input{{'a', 'A'}, {'c', 'C'}, {'b', 'B'}};
 
   using CharT = wchar_t;
-  check(SV("{a: A, b: B, c: C}"), SV("{}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{}"), input);
 
   // ***** underlying has no format-spec
 
   // *** align-fill & width ***
-  check(SV("{a: A, b: B, c: C}     "), SV("{:23}"), input);
-  check(SV("{a: A, b: B, c: C}*****"), SV("{:*<23}"), input);
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^23}"), input);
-  check(SV("#####{a: A, b: B, c: C}"), SV("{:#>23}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}     "), SV("{:35}"), input);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}*****"), SV("{:*<35}"), input);
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^35}"), input);
+  check(SV("#####{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{:#>35}"), input);
 
-  check(SV("{a: A, b: B, c: C}     "), SV("{:{}}"), input, 23);
-  check(SV("{a: A, b: B, c: C}*****"), SV("{:*<{}}"), input, 23);
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^{}}"), input, 23);
-  check(SV("#####{a: A, b: B, c: C}"), SV("{:#>{}}"), input, 23);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}     "), SV("{:{}}"), input, 35);
+  check(SV("{'a': 'A', 'b': 'B', 'c': 'C'}*****"), SV("{:*<{}}"), input, 35);
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^{}}"), input, 35);
+  check(SV("#####{'a': 'A', 'b': 'B', 'c': 'C'}"), SV("{:#>{}}"), input, 35);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -171,10 +171,10 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** n
-  check(SV("__a: A, b: B, c: C___"), SV("{:_^21n}"), input);
+  check(SV("__'a': 'A', 'b': 'B', 'c': 'C'___"), SV("{:_^33n}"), input);
 
   // *** type ***
-  check(SV("__{a: A, b: B, c: C}___"), SV("{:_^23m}"), input); // the m type does the same as the default.
+  check(SV("__{'a': 'A', 'b': 'B', 'c': 'C'}___"), SV("{:_^35m}"), input); // the m type does the same as the default.
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
@@ -642,20 +642,20 @@
   std::map<std::basic_string<CharT>, std::basic_string<CharT>> input{
       {STR("hello"), STR("HELLO")}, {STR("world"), STR("WORLD")}};
 
-  check(SV(R"({hello: HELLO, world: WORLD})"), SV("{}"), input);
+  check(SV(R"({"hello": "HELLO", "world": "WORLD"})"), SV("{}"), input);
 
   // ***** underlying has no format-spec
 
   // *** align-fill & width ***
-  check(SV(R"({hello: HELLO, world: WORLD}     )"), SV("{:33}"), input);
-  check(SV(R"({hello: HELLO, world: WORLD}*****)"), SV("{:*<33}"), input);
-  check(SV(R"(__{hello: HELLO, world: WORLD}___)"), SV("{:_^33}"), input);
-  check(SV(R"(#####{hello: HELLO, world: WORLD})"), SV("{:#>33}"), input);
+  check(SV(R"({"hello": "HELLO", "world": "WORLD"}     )"), SV("{:41}"), input);
+  check(SV(R"({"hello": "HELLO", "world": "WORLD"}*****)"), SV("{:*<41}"), input);
+  check(SV(R"(__{"hello": "HELLO", "world": "WORLD"}___)"), SV("{:_^41}"), input);
+  check(SV(R"(#####{"hello": "HELLO", "world": "WORLD"})"), SV("{:#>41}"), input);
 
-  check(SV(R"({hello: HELLO, world: WORLD}     )"), SV("{:{}}"), input, 33);
-  check(SV(R"({hello: HELLO, world: WORLD}*****)"), SV("{:*<{}}"), input, 33);
-  check(SV(R"(__{hello: HELLO, world: WORLD}___)"), SV("{:_^{}}"), input, 33);
-  check(SV(R"(#####{hello: HELLO, world: WORLD})"), SV("{:#>{}}"), input, 33);
+  check(SV(R"({"hello": "HELLO", "world": "WORLD"}     )"), SV("{:{}}"), input, 41);
+  check(SV(R"({"hello": "HELLO", "world": "WORLD"}*****)"), SV("{:*<{}}"), input, 41);
+  check(SV(R"(__{"hello": "HELLO", "world": "WORLD"}___)"), SV("{:_^{}}"), input, 41);
+  check(SV(R"(#####{"hello": "HELLO", "world": "WORLD"})"), SV("{:#>{}}"), input, 41);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -677,10 +677,10 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** n
-  check(SV(R"(__hello: HELLO, world: WORLD___)"), SV("{:_^31n}"), input);
+  check(SV(R"(__"hello": "HELLO", "world": "WORLD"___)"), SV("{:_^39n}"), input);
 
   // *** type ***
-  check(SV(R"(__{hello: HELLO, world: WORLD}___)"), SV("{:_^33m}"), input);
+  check(SV(R"(__{"hello": "HELLO", "world": "WORLD"}___)"), SV("{:_^41m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
index 27b8805..b2d32ba 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -29,13 +27,14 @@
 #include "format.functions.tests.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -43,20 +42,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch (const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
index 0001618..8ac3220 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
@@ -30,8 +26,11 @@
 #include <cassert>
 #include <concepts>
 #include <format>
+#include <iterator>
 #include <map>
 
+#include "assert_macros.h"
+#include "format.functions.common.h"
 #include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
@@ -55,9 +54,52 @@
 }
 
 template <class CharT>
+void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::map<parse_call_validator, parse_call_validator> arg{{parse_call_validator{}, parse_call_validator{}}};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  std::formatter<decltype(arg), CharT> formatter;
+  std::basic_format_parse_context<CharT> ctx{fmt};
+
+  formatter.parse(ctx);
+  formatter.format(arg, format_ctx);
+}
+
+template <class CharT>
+void test_assure_parse_is_called() {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::map<parse_call_validator, parse_call_validator> arg{{parse_call_validator{}, parse_call_validator{}}};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  { // parse not called
+    [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
+    TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
+  }
+
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("n"));
+  test_assure_parse_is_called(SV("m"));
+  test_assure_parse_is_called(SV("5n"));
+  test_assure_parse_is_called(SV("5m"));
+}
+
+template <class CharT>
 void test_fmt() {
   test_format(SV("{1: 42}"), std::map<int, int>{{1, 42}});
   test_format(SV("{0: 99}"), std::map<int, int>{{0, 99}});
+
+  test_assure_parse_is_called<CharT>();
 }
 
 void test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
index 92763be..441a717 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
@@ -39,23 +35,23 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<std::map<int, int>, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class CharT>
 constexpr void test_fmt() {
-  test_parse(SV(""));
-  test_parse(SV(":5"));
+  test_parse(SV(""), 0);
+  test_parse(SV(":5"), 0);
 
-  test_parse(SV("}"));
-  test_parse(SV(":5}"));
+  test_parse(SV("}"), 1);
+  test_parse(SV(":5}"), 1);
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
index 1361626..8272d13 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -32,13 +30,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.tests.h
index a884ba7..bbb49e2 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.tests.h
@@ -1100,20 +1100,20 @@
 
 template <class CharT, class TestFunction, class ExceptionTest>
 void test_pair_tuple(TestFunction check, ExceptionTest check_exception, auto&& input) {
-  check(SV("{(1, a), (42, *)}"), SV("{}"), input);
+  check(SV("{(1, 'a'), (42, '*')}"), SV("{}"), input);
 
   // ***** underlying has no format-spec
 
   // *** align-fill & width ***
-  check(SV("{(1, a), (42, *)}     "), SV("{:22}"), input);
-  check(SV("{(1, a), (42, *)}*****"), SV("{:*<22}"), input);
-  check(SV("__{(1, a), (42, *)}___"), SV("{:_^22}"), input);
-  check(SV("#####{(1, a), (42, *)}"), SV("{:#>22}"), input);
+  check(SV("{(1, 'a'), (42, '*')}     "), SV("{:26}"), input);
+  check(SV("{(1, 'a'), (42, '*')}*****"), SV("{:*<26}"), input);
+  check(SV("__{(1, 'a'), (42, '*')}___"), SV("{:_^26}"), input);
+  check(SV("#####{(1, 'a'), (42, '*')}"), SV("{:#>26}"), input);
 
-  check(SV("{(1, a), (42, *)}     "), SV("{:{}}"), input, 22);
-  check(SV("{(1, a), (42, *)}*****"), SV("{:*<{}}"), input, 22);
-  check(SV("__{(1, a), (42, *)}___"), SV("{:_^{}}"), input, 22);
-  check(SV("#####{(1, a), (42, *)}"), SV("{:#>{}}"), input, 22);
+  check(SV("{(1, 'a'), (42, '*')}     "), SV("{:{}}"), input, 26);
+  check(SV("{(1, 'a'), (42, '*')}*****"), SV("{:*<{}}"), input, 26);
+  check(SV("__{(1, 'a'), (42, '*')}___"), SV("{:_^{}}"), input, 26);
+  check(SV("#####{(1, 'a'), (42, '*')}"), SV("{:#>{}}"), input, 26);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -1137,11 +1137,11 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** n
-  check(SV("__(1, a), (42, *)___"), SV("{:_^20n}"), input);
-  check(SV("__(1, a), (42, *)___"), SV("{:_^20nm}"), input); // m should have no effect
+  check(SV("__(1, 'a'), (42, '*')___"), SV("{:_^24n}"), input);
+  check(SV("__(1, 'a'), (42, '*')___"), SV("{:_^24nm}"), input); // m should have no effect
 
   // *** type ***
-  check(SV("__{(1, a), (42, *)}___"), SV("{:_^22m}"), input);
+  check(SV("__{(1, 'a'), (42, '*')}___"), SV("{:_^26m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
@@ -1260,7 +1260,7 @@
   check(SV("__(42), (99)___"), SV("{:_^15n}"), input);
 
   // *** type ***
-  check(SV("__{(42), (99)}___"), SV("{:_^17m}"), input);
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
@@ -1366,7 +1366,7 @@
   check(SV("__(1, 10, 100), (42, 99, 0)___"), SV("{:_^30n}"), input);
 
   // *** type ***
-  check(SV("__{(1, 10, 100), (42, 99, 0)}___"), SV("{:_^32m}"), input);
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
index 4a8ee4c..8113b01 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -29,13 +27,14 @@
 #include "format.functions.tests.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -43,20 +42,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch (const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
index 651ae86..2da3c7f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
@@ -8,9 +8,8 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
 
 // <format>
 
@@ -26,9 +25,12 @@
 
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <format>
 #include <set>
 
+#include "assert_macros.h"
+#include "format.functions.common.h"
 #include "test_format_context.h"
 #include "test_macros.h"
 #include "make_string.h"
@@ -52,8 +54,49 @@
 }
 
 template <class CharT>
+void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::set<parse_call_validator> arg{parse_call_validator{}};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  std::formatter<decltype(arg), CharT> formatter;
+  std::basic_format_parse_context<CharT> ctx{fmt};
+
+  formatter.parse(ctx);
+  formatter.format(arg, format_ctx);
+}
+
+template <class CharT>
+void test_assure_parse_is_called() {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::set<parse_call_validator> arg{parse_call_validator{}};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  { // parse not called
+    [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
+    TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
+  }
+
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("n"));
+  test_assure_parse_is_called(SV("5n"));
+}
+
+template <class CharT>
 void test_fmt() {
   test_format(SV("{42}"), std::set<int>{42});
+
+  test_assure_parse_is_called<CharT>();
 }
 
 void test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
index 753a975..fede410 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
@@ -8,9 +8,8 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
 
 // <format>
 
@@ -36,23 +35,23 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<std::set<int>, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class CharT>
 constexpr void test_fmt() {
-  test_parse(SV(""));
-  test_parse(SV(":5"));
+  test_parse(SV(""), 0);
+  test_parse(SV(":5"), 0);
 
-  test_parse(SV("}"));
-  test_parse(SV(":5}"));
+  test_parse(SV("}"), 1);
+  test_parse(SV(":5}"), 1);
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.format.pass.cpp
new file mode 100644
index 0000000..2de2376
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.format.pass.cpp
@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// XFAIL: availability-fp_to_chars-missing
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   requires (K == range_format::string || K == range_format::debug_string)
+// struct range-default-formatter<K, R, charT>
+//
+// template<class... Args>
+//   string format(format_string<Args...> fmt, Args&&... args);
+// template<class... Args>
+//   wstring format(wformat_string<Args...> fmt, Args&&... args);
+
+#include <format>
+#include <cassert>
+
+#include "format.functions.tests.h"
+#include "test_format_string.h"
+#include "test_macros.h"
+#include "assert_macros.h"
+#include "concat_macros.h"
+
+auto test = []<class CharT, class... Args>(
+                std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
+  std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+};
+
+auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
+  // After P2216 most exceptions thrown by std::format become ill-formed.
+  // Therefore this tests does nothing.
+};
+
+int main(int, char**) {
+  format_tests<char>(test, test_exception);
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  format_tests<wchar_t>(test, test_exception);
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.tests.h
new file mode 100644
index 0000000..c0e9c9d
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.tests.h
@@ -0,0 +1,439 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_STD_UTILITIES_FORMAT_FORMAT_RANGE_FORMAT_RANGE_FMTSTR_FORMAT_FUNCTIONS_TESTS_H
+#define TEST_STD_UTILITIES_FORMAT_FORMAT_RANGE_FORMAT_RANGE_FMTSTR_FORMAT_FUNCTIONS_TESTS_H
+
+#include <array>
+#include <format>
+#include <list>
+
+#include "format.functions.common.h"
+#include "make_string.h"
+#include "platform_support.h" // locale name macros
+#include "test_macros.h"
+
+//
+// Types
+//
+
+template <class Container>
+class test_range_format_string {
+public:
+  explicit test_range_format_string(Container str) : str_(std::move(str)) {}
+
+  typename Container::const_iterator begin() const { return str_.begin(); }
+  typename Container::const_iterator end() const { return str_.end(); }
+
+private:
+  Container str_;
+};
+
+template <class Container>
+constexpr std::range_format std::format_kind<test_range_format_string<Container>> = std::range_format::string;
+
+template <class Container>
+class test_range_format_debug_string {
+public:
+  explicit test_range_format_debug_string(Container str) : str_(std::move(str)) {}
+
+  typename Container::const_iterator begin() const { return str_.begin(); }
+  typename Container::const_iterator end() const { return str_.end(); }
+
+private:
+  Container str_;
+};
+
+template <class Container>
+constexpr std::range_format std::format_kind<test_range_format_debug_string<Container>> =
+    std::range_format::debug_string;
+
+//
+// String
+//
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_string(TestFunction check, ExceptionTest check_exception, auto&& input) {
+  check(SV("hello"), SV("{}"), input);
+
+  // *** align-fill & width ***
+  check(SV("hello     "), SV("{:10}"), input);
+  check(SV("hello*****"), SV("{:*<10}"), input);
+  check(SV("__hello___"), SV("{:_^10}"), input);
+  check(SV(":::::hello"), SV("{::>10}"), input);
+
+  check(SV("hello     "), SV("{:{}}"), input, 10);
+  check(SV("hello*****"), SV("{:*<{}}"), input, 10);
+  check(SV("__hello___"), SV("{:_^{}}"), input, 10);
+  check(SV(":::::hello"), SV("{::>{}}"), input, 10);
+
+  check_exception("The format-spec fill field contains an invalid character", SV("{:}<}"), input);
+  check_exception("The format-spec fill field contains an invalid character", SV("{:{<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{:0}"), input);
+
+  // *** precision ***
+  check(SV("hel"), SV("{:.3}"), input);
+  check(SV("hel"), SV("{:.{}}"), input, 3);
+
+  check(SV("hel  "), SV("{:5.3}"), input);
+  check(SV("hel  "), SV("{:{}.{}}"), input, 5, 3);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
+
+  // *** type ***
+  check(SV("hello"), SV("{:s}"), input);
+  check(SV("\"hello\""), SV("{:?}"), input);
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s?"))
+    check_exception("The format-spec type has a type not supported for a string argument", fmt, input);
+}
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_string(TestFunction check, ExceptionTest check_exception) {
+  // libc++ uses different containers for contiguous and non-contiguous ranges.
+  std::basic_string<CharT> input = STR("hello");
+  test_string<CharT>(check, check_exception, test_range_format_string<std::basic_string<CharT>>{input});
+  test_string<CharT>(check, check_exception, test_range_format_string<std::basic_string_view<CharT>>{input});
+  test_string<CharT>(
+      check, check_exception, test_range_format_string<std::list<CharT>>{std::list<CharT>{input.begin(), input.end()}});
+}
+
+//
+// String range
+//
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_range_string(TestFunction check, ExceptionTest check_exception, auto&& input) {
+  check(SV(R"([Hello, world])"), SV("{}"), input);
+
+  // ***** underlying has no format-spec
+
+  // *** align-fill & width ***
+  check(SV(R"([Hello, world]     )"), SV("{:19}"), input);
+  check(SV(R"([Hello, world]*****)"), SV("{:*<19}"), input);
+  check(SV(R"(__[Hello, world]___)"), SV("{:_^19}"), input);
+  check(SV(R"(#####[Hello, world])"), SV("{:#>19}"), input);
+
+  check(SV(R"([Hello, world]     )"), SV("{:{}}"), input, 19);
+  check(SV(R"([Hello, world]*****)"), SV("{:*<{}}"), input, 19);
+  check(SV(R"(__[Hello, world]___)"), SV("{:_^{}}"), input, 19);
+  check(SV(R"(#####[Hello, world])"), SV("{:#>{}}"), input, 19);
+
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{::<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{:0}"), input);
+
+  // *** precision ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:.}"), input);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
+
+  // *** n
+  check(SV(R"(_Hello, world_)"), SV("{:_^14n}"), input);
+
+  // *** type ***
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
+  check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
+  check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
+
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s"))
+    check_exception("The format-spec should consume the input or end with a '}'", fmt, input);
+
+  // ***** Only underlying has a format-spec
+  check(SV(R"([Hello   , world   ])"), SV("{::8}"), input);
+  check(SV(R"([Hello***, world***])"), SV("{::*<8}"), input);
+  check(SV(R"([_Hello__, _world__])"), SV("{::_^8}"), input);
+  check(SV(R"([:::Hello, :::world])"), SV("{:::>8}"), input);
+
+  check(SV(R"([Hello   , world   ])"), SV("{::{}}"), input, 8);
+  check(SV(R"([Hello***, world***])"), SV("{::*<{}}"), input, 8);
+  check(SV(R"([_Hello__, _world__])"), SV("{::_^{}}"), input, 8);
+  check(SV(R"([:::Hello, :::world])"), SV("{:::>{}}"), input, 8);
+
+  check_exception("The format-spec fill field contains an invalid character", SV("{::}<}"), input);
+  check_exception("The format-spec fill field contains an invalid character", SV("{::{<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::-}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{::05}"), input);
+
+  // *** precision ***
+  check(SV(R"([Hel, wor])"), SV("{::.3}"), input);
+
+  check(SV(R"([Hel, wor])"), SV("{::.{}}"), input, 3);
+
+  check_exception("The format-spec precision field doesn't contain a value or arg-id", SV("{::.}"), input);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::L}"), input);
+
+  // *** type ***
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_nested_types<CharT>("s?"))
+    check_exception("The format-spec type has a type not supported for a string argument", fmt, input);
+
+  // ***** Both have a format-spec
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^25::>8}"), input);
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^{}::>8}"), input, 25);
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^{}::>{}}"), input, 25, 8);
+
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^25::>8}"), input);
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^{}::>8}"), input, 25);
+  check(SV(R"(^^[:::Hello, :::world]^^^)"), SV("{:^^{}::>{}}"), input, 25, 8);
+
+  check_exception("Argument index out of bounds", SV("{:^^{}::>8}"), input);
+  check_exception("Argument index out of bounds", SV("{:^^{}::>{}}"), input, 25);
+}
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_range_string(TestFunction check, ExceptionTest check_exception) {
+  // libc++ uses different containers for contiguous and non-contiguous ranges.
+  std::array input{STR("Hello"), STR("world")};
+  test_range_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_string<std::basic_string<CharT>>{input[0]},
+                 test_range_format_string<std::basic_string<CharT>>{input[1]}});
+  test_range_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_string<std::basic_string_view<CharT>>{input[0]},
+                 test_range_format_string<std::basic_string_view<CharT>>{input[1]}});
+  test_range_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_string<std::list<CharT>>{std::list<CharT>{input[0].begin(), input[0].end()}},
+                 test_range_format_string<std::list<CharT>>{std::list<CharT>{input[1].begin(), input[1].end()}}});
+  test_range_string<CharT>(
+      check,
+      check_exception,
+      std::list{test_range_format_string<std::list<CharT>>{std::list<CharT>{input[0].begin(), input[0].end()}},
+                test_range_format_string<std::list<CharT>>{std::list<CharT>{input[1].begin(), input[1].end()}}});
+}
+
+//
+// Debug string
+//
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_debug_string(TestFunction check, ExceptionTest check_exception, auto&& input) {
+  check(SV("\"hello\""), SV("{}"), input);
+
+  // *** align-fill & width ***
+  check(SV("\"hello\"     "), SV("{:12}"), input);
+  check(SV("\"hello\"*****"), SV("{:*<12}"), input);
+  check(SV("__\"hello\"___"), SV("{:_^12}"), input);
+  check(SV(":::::\"hello\""), SV("{::>12}"), input);
+
+  check(SV("\"hello\"     "), SV("{:{}}"), input, 12);
+  check(SV("\"hello\"*****"), SV("{:*<{}}"), input, 12);
+  check(SV("__\"hello\"___"), SV("{:_^{}}"), input, 12);
+  check(SV(":::::\"hello\""), SV("{::>{}}"), input, 12);
+
+  check_exception("The format-spec fill field contains an invalid character", SV("{:}<}"), input);
+  check_exception("The format-spec fill field contains an invalid character", SV("{:{<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{:0}"), input);
+
+  // *** precision ***
+  check(SV("\"he"), SV("{:.3}"), input);
+  check(SV("\"he"), SV("{:.{}}"), input, 3);
+
+  check(SV("\"he  "), SV("{:5.3}"), input);
+  check(SV("\"he  "), SV("{:{}.{}}"), input, 5, 3);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
+
+  // *** type ***
+  check(SV("\"hello\""), SV("{:s}"), input); // escape overrides the type option s
+  check(SV("\"hello\""), SV("{:?}"), input);
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s?"))
+    check_exception("The format-spec type has a type not supported for a string argument", fmt, input);
+}
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_debug_string(TestFunction check, ExceptionTest check_exception) {
+  // libc++ uses different containers for contiguous and non-contiguous ranges.
+  std::basic_string<CharT> input = STR("hello");
+  test_debug_string<CharT>(check, check_exception, test_range_format_debug_string<std::basic_string<CharT>>{input});
+  test_debug_string<CharT>(
+      check, check_exception, test_range_format_debug_string<std::basic_string_view<CharT>>{input});
+  test_debug_string<CharT>(
+      check,
+      check_exception,
+      test_range_format_debug_string<std::list<CharT>>{std::list<CharT>{input.begin(), input.end()}});
+}
+
+//
+// Debug string range
+//
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_range_debug_string(TestFunction check, ExceptionTest check_exception, auto&& input) {
+  // ***** underlying has no format-spec
+
+  // *** align-fill & width ***
+  check(SV(R"(["Hello", "world"]     )"), SV("{:23}"), input);
+  check(SV(R"(["Hello", "world"]*****)"), SV("{:*<23}"), input);
+  check(SV(R"(__["Hello", "world"]___)"), SV("{:_^23}"), input);
+  check(SV(R"(#####["Hello", "world"])"), SV("{:#>23}"), input);
+
+  check(SV(R"(["Hello", "world"]     )"), SV("{:{}}"), input, 23);
+  check(SV(R"(["Hello", "world"]*****)"), SV("{:*<{}}"), input, 23);
+  check(SV(R"(__["Hello", "world"]___)"), SV("{:_^{}}"), input, 23);
+  check(SV(R"(#####["Hello", "world"])"), SV("{:#>{}}"), input, 23);
+
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
+  check_exception("The format-spec range-fill field contains an invalid character", SV("{::<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{:0}"), input);
+
+  // *** precision ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:.}"), input);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
+
+  // *** n
+  check(SV(R"(_"Hello", "world"_)"), SV("{:_^18n}"), input);
+
+  // *** type ***
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
+  check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
+  check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
+
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s"))
+    check_exception("The format-spec should consume the input or end with a '}'", fmt, input);
+
+  // ***** Only underlying has a format-spec
+  check(SV(R"(["Hello"   , "world"   ])"), SV("{::10}"), input);
+  check(SV(R"(["Hello"***, "world"***])"), SV("{::*<10}"), input);
+  check(SV(R"([_"Hello"__, _"world"__])"), SV("{::_^10}"), input);
+  check(SV(R"([:::"Hello", :::"world"])"), SV("{:::>10}"), input);
+
+  check(SV(R"(["Hello"   , "world"   ])"), SV("{::{}}"), input, 10);
+  check(SV(R"(["Hello"***, "world"***])"), SV("{::*<{}}"), input, 10);
+  check(SV(R"([_"Hello"__, _"world"__])"), SV("{::_^{}}"), input, 10);
+  check(SV(R"([:::"Hello", :::"world"])"), SV("{:::>{}}"), input, 10);
+
+  check_exception("The format-spec fill field contains an invalid character", SV("{::}<}"), input);
+  check_exception("The format-spec fill field contains an invalid character", SV("{::{<}"), input);
+
+  // *** sign ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::-}"), input);
+
+  // *** alternate form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::#}"), input);
+
+  // *** zero-padding ***
+  check_exception("A format-spec width field shouldn't have a leading zero", SV("{::05}"), input);
+
+  // *** precision ***
+  check(SV(R"(["He, "wo])"), SV("{::.3}"), input);
+
+  check(SV(R"(["He, "wo])"), SV("{::.{}}"), input, 3);
+
+  check_exception("The format-spec precision field doesn't contain a value or arg-id", SV("{::.}"), input);
+
+  // *** locale-specific form ***
+  check_exception("The format-spec should consume the input or end with a '}'", SV("{::L}"), input);
+
+  // *** type ***
+  for (std::basic_string_view<CharT> fmt : fmt_invalid_nested_types<CharT>("s?"))
+    check_exception("The format-spec type has a type not supported for a string argument", fmt, input);
+
+  // ***** Both have a format-spec
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^29::>10}"), input);
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^{}::>10}"), input, 29);
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^{}::>{}}"), input, 29, 10);
+
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^29::>10}"), input);
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^{}::>10}"), input, 29);
+  check(SV(R"(^^[:::"Hello", :::"world"]^^^)"), SV("{:^^{}::>{}}"), input, 29, 10);
+
+  check_exception("Argument index out of bounds", SV("{:^^{}::>10}"), input);
+  check_exception("Argument index out of bounds", SV("{:^^{}::>{}}"), input, 29);
+}
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void test_range_debug_string(TestFunction check, ExceptionTest check_exception) {
+  // libc++ uses different containers for contiguous and non-contiguous ranges.
+  std::array input{STR("Hello"), STR("world")};
+  test_range_debug_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_debug_string<std::basic_string<CharT>>{input[0]},
+                 test_range_format_debug_string<std::basic_string<CharT>>{input[1]}});
+  test_range_debug_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_debug_string<std::basic_string_view<CharT>>{input[0]},
+                 test_range_format_debug_string<std::basic_string_view<CharT>>{input[1]}});
+  test_range_debug_string<CharT>(
+      check,
+      check_exception,
+      std::array{test_range_format_debug_string<std::list<CharT>>{std::list<CharT>{input[0].begin(), input[0].end()}},
+                 test_range_format_debug_string<std::list<CharT>>{std::list<CharT>{input[1].begin(), input[1].end()}}});
+  test_range_debug_string<CharT>(
+      check,
+      check_exception,
+      std::list{test_range_format_debug_string<std::list<CharT>>{std::list<CharT>{input[0].begin(), input[0].end()}},
+                test_range_format_debug_string<std::list<CharT>>{std::list<CharT>{input[1].begin(), input[1].end()}}});
+}
+
+//
+// Driver
+//
+
+template <class CharT, class TestFunction, class ExceptionTest>
+void format_tests(TestFunction check, ExceptionTest check_exception) {
+  test_string<CharT>(check, check_exception);
+  test_range_string<CharT>(check, check_exception);
+
+  test_debug_string<CharT>(check, check_exception);
+  test_range_debug_string<CharT>(check, check_exception);
+}
+
+#endif //  TEST_STD_UTILITIES_FORMAT_FORMAT_RANGE_FORMAT_RANGE_FMTSTR_FORMAT_FUNCTIONS_TESTS_H
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.vformat.pass.cpp
new file mode 100644
index 0000000..a549b69
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.vformat.pass.cpp
@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Fix this test using GCC, it currently times out.
+// UNSUPPORTED: gcc-12
+
+// XFAIL: availability-fp_to_chars-missing
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   requires (K == range_format::string || K == range_format::debug_string)
+// struct range-default-formatter<K, R, charT>
+//
+// string vformat(string_view fmt, format_args args);
+// wstring vformat(wstring_view fmt, wformat_args args);
+
+#include <format>
+#include <cassert>
+
+#include "format.functions.tests.h"
+#include "test_macros.h"
+#include "assert_macros.h"
+#include "concat_macros.h"
+
+auto test = []<class CharT, class... Args>(
+                std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
+  std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+};
+
+auto test_exception =
+    []<class CharT, class... Args>(
+        [[maybe_unused]] std::string_view what,
+        [[maybe_unused]] std::basic_string_view<CharT> fmt,
+        [[maybe_unused]] Args&&... args) {
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
+    };
+
+int main(int, char**) {
+  format_tests<char>(test, test_exception);
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  format_tests<wchar_t>(test, test_exception);
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.pass.cpp
new file mode 100644
index 0000000..9ae44b3
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.pass.cpp
@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Investigate why this fails.
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   requires (K == range_format::string || K == range_format::debug_string)
+// struct range-default-formatter<K, R, charT>
+
+// template<class FormatContext>
+//   typename FormatContext::iterator
+//     format(const T& ref, FormatContext& ctx) const;
+
+// Note this tests the basics of this function. It's tested in more detail in
+// the format.functions test.
+
+#include <cassert>
+#include <concepts>
+#include <format>
+
+#include "format.functions.tests.h"
+#include "test_format_context.h"
+#include "test_macros.h"
+
+template <class StringViewT, class ArgT>
+void test_format(StringViewT expected, ArgT arg) {
+  using CharT      = typename StringViewT::value_type;
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+
+  std::formatter<ArgT, CharT> formatter;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+  formatter.format(arg, format_ctx);
+  assert(result == expected);
+}
+
+template <class CharT>
+void test_fmt() {
+  test_format(SV("hello"), test_range_format_string<std::basic_string<CharT>>{STR("hello")});
+  test_format(SV("hello"), test_range_format_debug_string<std::basic_string<CharT>>{STR("hello")});
+}
+
+void test() {
+  test_fmt<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_fmt<wchar_t>();
+#endif
+}
+
+int main(int, char**) {
+  test();
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp
new file mode 100644
index 0000000..64919eb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp
@@ -0,0 +1,73 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// TODO FMT Investigate why this fails.
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+
+// <format>
+
+// template<ranges::input_range R, class charT>
+//   requires (K == range_format::string || K == range_format::debug_string)
+// struct range-default-formatter<K, R, charT>
+
+// template<class ParseContext>
+//   constexpr typename ParseContext::iterator
+//     parse(ParseContext& ctx);
+
+// Note this tests the basics of this function. It's tested in more detail in
+// the format.functions test.
+
+#include <cassert>
+#include <concepts>
+#include <format>
+
+#include "format.functions.tests.h"
+#include "test_format_context.h"
+#include "test_macros.h"
+
+template <class FormatterT, class StringViewT>
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
+  using CharT    = typename StringViewT::value_type;
+  auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
+  FormatterT formatter;
+  static_assert(std::semiregular<decltype(formatter)>);
+
+  std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
+  assert(it == fmt.end() - offset);
+}
+
+template <class StringViewT>
+constexpr void test_formatters(StringViewT fmt, std::size_t offset) {
+  using CharT = typename StringViewT::value_type;
+  test_parse<std::formatter<test_range_format_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
+  test_parse<std::formatter<test_range_format_debug_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
+}
+
+template <class CharT>
+constexpr void test_char_type() {
+  test_formatters(SV(""), 0);
+  test_formatters(SV("}"), 1);
+}
+
+constexpr bool test() {
+  test_char_type<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test_char_type<wchar_t>();
+#endif
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
index 78e04fe..02c9467 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -33,13 +31,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.tests.h
index a465916..57f1861 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.tests.h
@@ -17,6 +17,7 @@
 #include <list>
 #include <ranges>
 #include <span>
+#include <tuple>
 #include <vector>
 
 #include "format.functions.common.h"
@@ -927,20 +928,20 @@
   // So when there is no range-underlying-spec, there is no need to call parse
   // thus the char element is not escaped.
   // TODO FMT P2733 addresses this issue.
-  check(SV("[(1, a), (42, *)]"), SV("{}"), input);
+  check(SV("[(1, 'a'), (42, '*')]"), SV("{}"), input);
 
   // ***** underlying has no format-spec
 
   // *** align-fill & width ***
-  check(SV("[(1, a), (42, *)]     "), SV("{:22}"), input);
-  check(SV("[(1, a), (42, *)]*****"), SV("{:*<22}"), input);
-  check(SV("__[(1, a), (42, *)]___"), SV("{:_^22}"), input);
-  check(SV("#####[(1, a), (42, *)]"), SV("{:#>22}"), input);
+  check(SV("[(1, 'a'), (42, '*')]     "), SV("{:26}"), input);
+  check(SV("[(1, 'a'), (42, '*')]*****"), SV("{:*<26}"), input);
+  check(SV("__[(1, 'a'), (42, '*')]___"), SV("{:_^26}"), input);
+  check(SV("#####[(1, 'a'), (42, '*')]"), SV("{:#>26}"), input);
 
-  check(SV("[(1, a), (42, *)]     "), SV("{:{}}"), input, 22);
-  check(SV("[(1, a), (42, *)]*****"), SV("{:*<{}}"), input, 22);
-  check(SV("__[(1, a), (42, *)]___"), SV("{:_^{}}"), input, 22);
-  check(SV("#####[(1, a), (42, *)]"), SV("{:#>{}}"), input, 22);
+  check(SV("[(1, 'a'), (42, '*')]     "), SV("{:{}}"), input, 26);
+  check(SV("[(1, 'a'), (42, '*')]*****"), SV("{:*<{}}"), input, 26);
+  check(SV("__[(1, 'a'), (42, '*')]___"), SV("{:_^{}}"), input, 26);
+  check(SV("#####[(1, 'a'), (42, '*')]"), SV("{:#>{}}"), input, 26);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -964,11 +965,11 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** n
-  check(SV("__(1, a), (42, *)___"), SV("{:_^20n}"), input);
-  check(SV("__(1, a), (42, *)___"), SV("{:_^20nm}"), input); // m should have no effect
+  check(SV("__(1, 'a'), (42, '*')___"), SV("{:_^24n}"), input);
+  check(SV("__(1, 'a'), (42, '*')___"), SV("{:_^24nm}"), input); // m should have no effect
 
   // *** type ***
-  check(SV("__{(1, a), (42, *)}___"), SV("{:_^22m}"), input);
+  check(SV("__{(1, 'a'), (42, '*')}___"), SV("{:_^26m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
   for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s"))
@@ -1083,7 +1084,7 @@
   check(SV("__(42), (99)___"), SV("{:_^15n}"), input);
 
   // *** type ***
-  check(SV("__{(42), (99)}___"), SV("{:_^17m}"), input);
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
   for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s"))
@@ -1184,7 +1185,7 @@
   check(SV("__(42, 99, 0), (1, 10, 100)___"), SV("{:_^30n}"), input);
 
   // *** type ***
-  check(SV("__{(42, 99, 0), (1, 10, 100)}___"), SV("{:_^32m}"), input);
+  check_exception("The range-format-spec type m requires two elements for a pair or tuple", SV("{:m}"), input);
   check_exception("The range-format-spec type s requires formatting a character type", SV("{:s}"), input);
   check_exception("The range-format-spec type ?s requires formatting a character type", SV("{:?s}"), input);
   for (std::basic_string_view<CharT> fmt : fmt_invalid_types<CharT>("s"))
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
index c473893..06558b3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
@@ -11,9 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -30,13 +28,14 @@
 #include "format.functions.tests.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -44,20 +43,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch (const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
index acfe8cc..e62c562 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
@@ -30,12 +26,15 @@
 
 #include <cassert>
 #include <concepts>
+#include <iterator>
 #include <format>
 #include <vector>
 
+#include "assert_macros.h"
+#include "format.functions.common.h"
+#include "make_string.h"
 #include "test_format_context.h"
 #include "test_macros.h"
-#include "make_string.h"
 
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
@@ -56,9 +55,55 @@
 }
 
 template <class CharT>
+void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::vector<parse_call_validator> arg{1};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  std::range_formatter<parse_call_validator, CharT> formatter;
+  std::basic_format_parse_context<CharT> ctx{fmt};
+
+  formatter.parse(ctx);
+  formatter.format(arg, format_ctx);
+}
+
+template <class CharT>
+void test_assure_parse_is_called() {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::vector<parse_call_validator> arg{1};
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  { // parse not called
+    [[maybe_unused]] const std::range_formatter<parse_call_validator, CharT> formatter;
+    TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
+  }
+
+  // The range-format-spec has no range-underlying-spec
+  // This uses various variants, which have different code paths in libc++
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("n"));
+  test_assure_parse_is_called(SV(":"));
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("5n"));
+  test_assure_parse_is_called(SV("5n:"));
+}
+
+template <class CharT>
 void test_fmt() {
   test_format(SV("[1]"), std::vector<int>{1});
   test_format(SV("[0]"), std::vector<int>{0});
+
+  test_assure_parse_is_called<CharT>();
 }
 
 void test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
index ce1c0c9..9ea2ed8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
@@ -39,23 +35,23 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class StringViewT>
-constexpr void test_parse(StringViewT fmt) {
+constexpr void test_parse(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::range_formatter<int, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class CharT>
 constexpr void test_fmt() {
-  test_parse(SV(""));
-  test_parse(SV(":d"));
+  test_parse(SV(""), 0);
+  test_parse(SV(":d"), 0);
 
-  test_parse(SV("}"));
-  test_parse(SV(":d}"));
+  test_parse(SV("}"), 1);
+  test_parse(SV(":d}"), 1);
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
index fe2d72c..0b0e3a1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
@@ -22,13 +18,14 @@
 // class range_formatter
 
 // constexpr void constexpr void set_brackets(basic_string_view<charT> opening,
-//                                            basic_string_view<charT> closing);
+//                                            basic_string_view<charT> closing) noexcept;
 
 // Note this tests the basics of this function. It's tested in more detail in
 // the format functions test.
 
 #include <format>
 #include <cassert>
+#include <iterator>
 #include <type_traits>
 #include <vector>
 
@@ -41,6 +38,8 @@
 constexpr void test_setter() {
   std::range_formatter<int, CharT> formatter;
   formatter.set_brackets(SV("open"), SV("close"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_brackets(std::basic_string_view<CharT>{}, std::basic_string_view<CharT>{})));
 
   // Note there is no direct way to validate this function modified the object.
   if (!std::is_constant_evaluated()) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
index 413f5b4..c63cc52 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
@@ -11,23 +11,20 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
 //   requires same_as<remove_cvref_t<T>, T> && formattable<T, charT>
 // class range_formatter
 
-// constexpr void set_separator(basic_string_view<charT> sep);
+// constexpr void set_separator(basic_string_view<charT> sep) noexcept;
 
 // Note this tests the basics of this function. It's tested in more detail in
 // the format functions test.
 
 #include <format>
 #include <cassert>
+#include <iterator>
 #include <type_traits>
 #include <vector>
 
@@ -40,6 +37,8 @@
 constexpr void test_setter() {
   std::range_formatter<int, CharT> formatter;
   formatter.set_separator(SV("sep"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_separator(std::basic_string_view<CharT>{})));
 
   // Note there is no direct way to validate this function modified the object.
   if (!std::is_constant_evaluated()) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
index 7d819d4..52ac58a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
@@ -11,18 +11,14 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
 //   requires same_as<remove_cvref_t<T>, T> && formattable<T, charT>
 // class range_formatter
 
-// constexpr formatter<T, charT>& underlying();
-// constexpr const formatter<T, charT>& underlying() const;
+// constexpr formatter<T, charT>& underlying() noexcept;
+// constexpr const formatter<T, charT>& underlying() const noexcept;
 
 #include <concepts>
 #include <format>
@@ -34,10 +30,12 @@
   {
     std::range_formatter<int, CharT> formatter;
     [[maybe_unused]] std::same_as<std::formatter<int, CharT>&> decltype(auto) underlying = formatter.underlying();
+    static_assert(noexcept(formatter.underlying()));
   }
   {
     const std::range_formatter<int, CharT> formatter;
     [[maybe_unused]] std::same_as<const std::formatter<int, CharT>&> decltype(auto) underlying = formatter.underlying();
+    static_assert(noexcept(formatter.underlying()));
   }
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.pass.cpp
new file mode 100644
index 0000000..6d148ae
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.pass.cpp
@@ -0,0 +1,90 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// XFAIL: availability-fp_to_chars-missing
+
+// <format>
+
+// [format.string.std]/8
+// If { arg-idopt } is used in a width or precision, the value of the
+// corresponding formatting argument is used in its place. If the
+// corresponding formatting argument is not of standard signed or unsigned
+// integer type, or its value is negative for precision or non-positive for
+// width, an exception of type format_error is thrown.
+//
+// This test does the run-time validation
+
+#include <cassert>
+#include <format>
+
+#include "assert_macros.h"
+#include "concat_macros.h"
+#include "format.functions.common.h"
+#include "make_string.h"
+#include "test_macros.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT, class... Args>
+void test_exception([[maybe_unused]] std::basic_string_view<CharT> fmt, [[maybe_unused]] Args&&... args) {
+  [[maybe_unused]] std::string_view what = "Replacement argument isn't a standard signed or unsigned integer type";
+  TEST_VALIDATE_EXCEPTION(
+      std::format_error,
+      [&]([[maybe_unused]] const std::format_error& e) {
+        TEST_LIBCPP_REQUIRE(
+            e.what() == what,
+            TEST_WRITE_CONCATENATED(
+                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+      },
+      TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
+}
+
+template <class CharT>
+void test() {
+  // *** Width ***
+  test_exception(SV("{:{}}"), 42, true);
+  test_exception(SV("{:{}}"), 42, '0');
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  if constexpr (std::same_as<CharT, wchar_t>)
+    test_exception(SV("{:{}}"), 42, L'0');
+#endif
+#ifndef TEST_HAS_NO_INT128
+  test_exception(SV("{:{}}"), 42, __int128_t(0));
+  test_exception(SV("{:{}}"), 42, __uint128_t(0));
+#endif
+  test_exception(SV("{:{}}"), 42, 42.0f);
+  test_exception(SV("{:{}}"), 42, 42.0);
+  test_exception(SV("{:{}}"), 42, 42.0l);
+
+  // *** Precision ***
+  test_exception(SV("{:0.{}}"), 42.0, true);
+  test_exception(SV("{:0.{}}"), 42.0, '0');
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  if constexpr (std::same_as<CharT, wchar_t>)
+    test_exception(SV("{:0.{}}"), 42.0, L'0');
+#endif
+#ifndef TEST_HAS_NO_INT128
+  test_exception(SV("{:0.{}}"), 42.0, __int128_t(0));
+  test_exception(SV("{:0.{}}"), 42.0, __uint128_t(0));
+#endif
+  test_exception(SV("{:0.{}}"), 42.0, 42.0f);
+  test_exception(SV("{:0.{}}"), 42.0, 42.0);
+  test_exception(SV("{:0.{}}"), 42.0, 42.0l);
+}
+
+int main(int, char**) {
+  test<char>();
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.verify.cpp
new file mode 100644
index 0000000..ce6ca7b
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.string/format.string.std/lwg3720_arg_id_width_precision_allowed_types.verify.cpp
@@ -0,0 +1,109 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// XFAIL: availability-fp_to_chars-missing
+
+// <format>
+
+// [format.string.std]/8
+// If { arg-idopt } is used in a width or precision, the value of the
+// corresponding formatting argument is used in its place. If the
+// corresponding formatting argument is not of standard signed or unsigned
+// integer type, or its value is negative for precision or non-positive for
+// width, an exception of type format_error is thrown.
+//
+// This test does the compile-time validation
+
+#include <format>
+
+#include "test_macros.h"
+
+void test_char_width() {
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, true);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, '0');
+#ifndef TEST_HAS_NO_INT128
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, __int128_t(0));
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, __uint128_t(0));
+#endif
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, 42.0f);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, 42.0);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:{}}", 42, 42.0l);
+}
+
+void test_char_precision() {
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, true);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, '0');
+#ifndef TEST_HAS_NO_INT128
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, __int128_t(0));
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, __uint128_t(0));
+#endif
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, 42.0f);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, 42.0);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format("{:0.{}}", 42.0, 42.0l);
+}
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+void test_wchar_t_width() {
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, true);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, '0');
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, L'0');
+#  ifndef TEST_HAS_NO_INT128
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, __int128_t(0));
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, __uint128_t(0));
+#  endif
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, 42.0f);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, 42.0);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:{}}", 42, 42.0l);
+}
+
+void test_wchar_t_precision() {
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, true);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, '0');
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, L'0');
+#  ifndef TEST_HAS_NO_INT128
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, __int128_t(0));
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, __uint128_t(0));
+#  endif
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, 42.0f);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, 42.0);
+  // expected-error-re@*:* {{call to consteval function {{.*}} is not a constant expression}}
+  TEST_IGNORE_NODISCARD std::format(L"{:0.{}}", 42.0, 42.0l);
+}
+
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.syn/format_to_n_result.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.syn/format_to_n_result.pass.cpp
index 6b21023..d1e1b2d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.syn/format_to_n_result.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.syn/format_to_n_result.pass.cpp
@@ -22,6 +22,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <iterator>
 
 #include "test_macros.h"
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
index 6f64016..1132815 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -34,13 +33,14 @@
 #include "test_format_string.h"
 #include "test_macros.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
index 58685f9..92fd195 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
 #include <format>
 
 #include <utility>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.tests.h b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.tests.h
index 3f7a1fa..6ebc17d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.tests.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.tests.h
@@ -10,6 +10,7 @@
 
 #include <concepts>
 #include <format>
+#include <tuple>
 
 #include "format.functions.common.h"
 
@@ -287,18 +288,18 @@
   //   P2733 Fix handling of empty specifiers in std::format
   // addressed this.
 
-  check(SV("(42, (hello, red))"), SV("{}"), input);
+  check(SV("(42, (\"hello\", \"red\"))"), SV("{}"), input);
 
   // *** align-fill & width ***
-  check(SV("(42, (hello, red))     "), SV("{:23}"), input);
-  check(SV("(42, (hello, red))*****"), SV("{:*<23}"), input);
-  check(SV("__(42, (hello, red))___"), SV("{:_^23}"), input);
-  check(SV("#####(42, (hello, red))"), SV("{:#>23}"), input);
+  check(SV("(42, (\"hello\", \"red\"))     "), SV("{:27}"), input);
+  check(SV("(42, (\"hello\", \"red\"))*****"), SV("{:*<27}"), input);
+  check(SV("__(42, (\"hello\", \"red\"))___"), SV("{:_^27}"), input);
+  check(SV("#####(42, (\"hello\", \"red\"))"), SV("{:#>27}"), input);
 
-  check(SV("(42, (hello, red))     "), SV("{:{}}"), input, 23);
-  check(SV("(42, (hello, red))*****"), SV("{:*<{}}"), input, 23);
-  check(SV("__(42, (hello, red))___"), SV("{:_^{}}"), input, 23);
-  check(SV("#####(42, (hello, red))"), SV("{:#>{}}"), input, 23);
+  check(SV("(42, (\"hello\", \"red\"))     "), SV("{:{}}"), input, 27);
+  check(SV("(42, (\"hello\", \"red\"))*****"), SV("{:*<{}}"), input, 27);
+  check(SV("__(42, (\"hello\", \"red\"))___"), SV("{:_^{}}"), input, 27);
+  check(SV("#####(42, (\"hello\", \"red\"))"), SV("{:#>{}}"), input, 27);
 
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:}<}"), input);
   check_exception("The format-spec range-fill field contains an invalid character", SV("{:{<}"), input);
@@ -322,8 +323,8 @@
   check_exception("The format-spec should consume the input or end with a '}'", SV("{:L}"), input);
 
   // *** type ***
-  check(SV("__42: (hello, red)___"), SV("{:_^21m}"), input);
-  check(SV("__42, (hello, red)___"), SV("{:_^21n}"), input);
+  check(SV("__42: (\"hello\", \"red\")___"), SV("{:_^25m}"), input);
+  check(SV("__42, (\"hello\", \"red\")___"), SV("{:_^25n}"), input);
 
   for (CharT c : SV("aAbBcdeEfFgGopsxX?")) {
     check_exception("The format-spec should consume the input or end with a '}'",
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
index 6853134..fd97e00 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
@@ -10,9 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
@@ -30,13 +28,14 @@
 #include "test_macros.h"
 #include "format.functions.tests.h"
 #include "assert_macros.h"
+#include "concat_macros.h"
 
 auto test = []<class CharT, class... Args>(
                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-  TEST_REQUIRE(
-      out == expected,
-      test_concat_message("\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
 };
 
 auto test_exception =
@@ -44,20 +43,15 @@
         [[maybe_unused]] std::string_view what,
         [[maybe_unused]] std::basic_string_view<CharT> fmt,
         [[maybe_unused]] Args&&... args) {
-#ifndef TEST_HAS_NO_EXCEPTIONS
-      try {
-        TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
-        TEST_FAIL(test_concat_message("\nFormat string   ", fmt, "\nDidn't throw an exception.\n"));
-      } catch ([[maybe_unused]] const std::format_error& e) {
-        TEST_LIBCPP_REQUIRE(
-            e.what() == what,
-            test_concat_message(
-                "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
-
-        return;
-      }
-      assert(false);
-#endif
+      TEST_VALIDATE_EXCEPTION(
+          std::format_error,
+          [&]([[maybe_unused]] const std::format_error& e) {
+            TEST_LIBCPP_REQUIRE(
+                e.what() == what,
+                TEST_WRITE_CONCATENATED(
+                    "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
+          },
+          TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
     };
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
index 442df5d..d9571e6 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
@@ -30,12 +26,15 @@
 #include <cassert>
 #include <concepts>
 #include <format>
+#include <iterator>
 #include <tuple>
 #include <utility>
 
+#include "assert_macros.h"
+#include "format.functions.common.h"
+#include "make_string.h"
 #include "test_format_context.h"
 #include "test_macros.h"
-#include "make_string.h"
 
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
@@ -56,11 +55,54 @@
 }
 
 template <class CharT>
+void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::pair<parse_call_validator, parse_call_validator> arg;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  std::formatter<decltype(arg), CharT> formatter;
+  std::basic_format_parse_context<CharT> ctx{fmt};
+
+  formatter.parse(ctx);
+  formatter.format(arg, format_ctx);
+}
+
+template <class CharT>
+void test_assure_parse_is_called() {
+  using String     = std::basic_string<CharT>;
+  using OutIt      = std::back_insert_iterator<String>;
+  using FormatCtxT = std::basic_format_context<OutIt, CharT>;
+  std::pair<parse_call_validator, parse_call_validator> arg;
+
+  String result;
+  OutIt out             = std::back_inserter(result);
+  FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
+
+  { // parse not called
+    [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
+    TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
+  }
+
+  test_assure_parse_is_called(SV("5"));
+  test_assure_parse_is_called(SV("n"));
+  test_assure_parse_is_called(SV("m"));
+  test_assure_parse_is_called(SV("5n"));
+  test_assure_parse_is_called(SV("5m"));
+}
+
+template <class CharT>
 void test() {
   test(SV("(1)"), std::tuple<int>{1});
   test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
   test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
-  test(SV("(1, 1, 1)"), std::tuple<int, CharT, double>{1, CharT('1'), 1.0});
+  test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
+
+  test_assure_parse_is_called<CharT>();
 }
 
 void test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
index 05c9055..3cb699a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
@@ -40,23 +36,23 @@
 #define SV(S) MAKE_STRING_VIEW(CharT, S)
 
 template <class Arg, class StringViewT>
-constexpr void test(StringViewT fmt) {
+constexpr void test(StringViewT fmt, std::size_t offset) {
   using CharT    = typename StringViewT::value_type;
   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
   std::formatter<Arg, CharT> formatter;
   static_assert(std::semiregular<decltype(formatter)>);
 
   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
-  assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}'));
+  assert(it == fmt.end() - offset);
 }
 
 template <class CharT, class Arg>
 constexpr void test() {
-  test<Arg>(SV(""));
-  test<Arg>(SV("42"));
+  test<Arg>(SV(""), 0);
+  test<Arg>(SV("42"), 0);
 
-  test<Arg>(SV("}"));
-  test<Arg>(SV("42}"));
+  test<Arg>(SV("}"), 1);
+  test<Arg>(SV("42}"), 1);
 }
 
 template <class CharT>
@@ -64,7 +60,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
index 86c9845..63efdb0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
@@ -11,17 +11,13 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
 //   struct formatter<pair-or-tuple<Ts...>, charT>
 
 // constexpr void constexpr void set_brackets(basic_string_view<charT> opening,
-//                                            basic_string_view<charT> closing);
+//                                            basic_string_view<charT> closing) noexcept;
 
 // Note this tests the basics of this function. It's tested in more detail in
 // the format functions tests.
@@ -38,6 +34,8 @@
 constexpr void test() {
   std::formatter<Arg, CharT> formatter;
   formatter.set_brackets(SV("open"), SV("close"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_brackets(std::basic_string_view<CharT>{}, std::basic_string_view<CharT>{})));
 
   // Note there is no direct way to validate this function modified the object.
 }
@@ -47,7 +45,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
index fd2c827..92a77b3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
@@ -11,17 +11,13 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // class range_formatter
 // template<class charT, formattable<charT>... Ts>
 //   struct formatter<pair-or-tuple<Ts...>, charT>
 
-// constexpr void set_separator(basic_string_view<charT> sep);
+// constexpr void set_separator(basic_string_view<charT> sep) noexcept;
 
 // Note this tests the basics of this function. It's tested in more detail in
 // the format functions tests.
@@ -38,6 +34,8 @@
 constexpr void test() {
   std::formatter<Arg, CharT> formatter;
   formatter.set_separator(SV("sep"));
+  // Note the SV macro may throw, so can't use it.
+  static_assert(noexcept(formatter.set_separator(std::basic_string_view<CharT>{})));
 
   // Note there is no direct way to validate this function modified the object.
 }
@@ -47,7 +45,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
index f3ef086..5940988 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
@@ -23,8 +23,10 @@
     LIBCPP_STATIC_ASSERT(std::is_bind_expression<T&>::value == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_bind_expression<const T>::value == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_bind_expression<const T&>::value == Expected, "");
+    static_assert(std::is_base_of<std::integral_constant<bool, Expected>, std::is_bind_expression<T> >::value, "");
 
 #if TEST_STD_VER > 14
+    ASSERT_SAME_TYPE(decltype(std::is_bind_expression_v<T>), const bool);
     static_assert(std::is_bind_expression_v<T> == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_bind_expression_v<T&> == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_bind_expression_v<const T> == Expected, "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/is_placeholder.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/is_placeholder.pass.cpp
index c020ea4..1e85ca7 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/is_placeholder.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/is_placeholder.pass.cpp
@@ -21,8 +21,13 @@
     LIBCPP_STATIC_ASSERT(std::is_placeholder<T&>::value == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_placeholder<const T>::value == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_placeholder<const T&>::value == Expected, "");
+    static_assert(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<T> >::value, "");
+    LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<T&> >::value, "");
+    LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<const T> >::value, "");
+    LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<const T&> >::value, "");
 
 #if TEST_STD_VER > 14
+    ASSERT_SAME_TYPE(decltype(std::is_placeholder_v<T>), const int);
     static_assert(std::is_placeholder_v<T> == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_placeholder_v<T&> == Expected, "");
     LIBCPP_STATIC_ASSERT(std::is_placeholder_v<const T> == Expected, "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.bind_front/bind_front.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.bind_front/bind_front.verify.cpp
index f7d2499..ac9c97d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.bind_front/bind_front.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.bind_front/bind_front.verify.cpp
@@ -15,8 +15,6 @@
 
 #include <functional>
 
-#include "test_macros.h"
-
 constexpr int pass(const int n) { return n; }
 
 int simple(int n) { return n; }
@@ -34,8 +32,7 @@
 
 void testNotMoveConst(NotMoveConst) { }
 
-int main(int, char**)
-{
+void f() {
     int n = 1;
     const int c = 1;
 
@@ -45,6 +42,4 @@
     auto d = std::bind_front(do_nothing, n); // expected-error {{no matching function for call to 'bind_front'}}
 
     auto t = std::bind_front(testNotMoveConst, NotMoveConst(0)); // expected-error {{no matching function for call to 'bind_front'}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp
deleted file mode 100644
index b040465..0000000
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp
+++ /dev/null
@@ -1,40 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <functional>
-
-// template <class F, class ...Args>
-// result_of_t<F&&(Args&&...)> invoke(F&&, Args&&...);
-
-#include <functional>
-#include <cassert>
-
-#include "test_macros.h"
-
-#if TEST_STD_VER <= 14
-# ifdef __cpp_lib_invoke
-#   error Feature test macro should be defined
-# endif
-#else
-# ifndef __cpp_lib_invoke
-#   error Feature test macro not defined
-# endif
-# if __cpp_lib_invoke != 201411
-#   error __cpp_lib_invoke has the wrong value
-# endif
-#endif
-
-int foo(int) { return 42; }
-
-int main(int, char**) {
-#if defined(__cpp_lib_invoke)
-  assert(std::invoke(foo, 101) == 42);
-#endif
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.pass.cpp
new file mode 100644
index 0000000..af4c0ba
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.pass.cpp
@@ -0,0 +1,139 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// <functional>
+
+// template<class R, class F, class... Args>
+// constexpr R invoke_r(F&& f, Args&&... args)              // C++23
+//     noexcept(is_nothrow_invocable_r_v<R, F, Args...>);
+
+#include <cassert>
+#include <concepts>
+#include <functional>
+#include <type_traits>
+#include <utility> // declval
+
+template <class R, class F, class ...Args>
+concept can_invoke_r = requires {
+    { std::invoke_r<R>(std::declval<F>(), std::declval<Args>()...) } -> std::same_as<R>;
+};
+
+constexpr bool test() {
+    // Make sure basic functionality works (i.e. we actually call the function and
+    // return the right result).
+    {
+        auto f = [](int i) { return i + 3; };
+        assert(std::invoke_r<int>(f, 4) == 7);
+    }
+
+    // Make sure invoke_r is SFINAE-friendly
+    {
+        auto f = [](int) -> char* { return nullptr; };
+        static_assert( can_invoke_r<char*, decltype(f), int>);
+        static_assert( can_invoke_r<void*, decltype(f), int>);
+        static_assert( can_invoke_r<void,  decltype(f), int>);   // discard return type
+        static_assert(!can_invoke_r<char*, decltype(f), void*>); // wrong argument type
+        static_assert(!can_invoke_r<char*, decltype(f)>);        // missing argument
+        static_assert(!can_invoke_r<int*,  decltype(f), int>);   // incompatible return type
+        static_assert(!can_invoke_r<void,  decltype(f), void*>); // discard return type, invalid argument type
+    }
+
+    // Make sure invoke_r has the right noexcept specification
+    {
+        auto f = [](int) noexcept(true) -> char* { return nullptr; };
+        auto g = [](int) noexcept(false) -> char* { return nullptr; };
+        struct ConversionNotNoexcept {
+            constexpr ConversionNotNoexcept(char*) noexcept(false) { }
+        };
+        static_assert( noexcept(std::invoke_r<char*>(f, 0)));
+        static_assert(!noexcept(std::invoke_r<char*>(g, 0)));                 // function call is not noexcept
+        static_assert(!noexcept(std::invoke_r<ConversionNotNoexcept>(f, 0))); // function call is noexcept, conversion isn't
+        static_assert(!noexcept(std::invoke_r<ConversionNotNoexcept>(g, 0))); // function call and conversion are both not noexcept
+    }
+
+    // Make sure invoke_r works with cv-qualified void return type
+    {
+        auto check = []<class CV_Void> {
+            bool was_called = false;
+            auto f = [&](int) -> char* { was_called = true; return nullptr; };
+            std::invoke_r<CV_Void>(f, 3);
+            assert(was_called);
+            static_assert(std::is_void_v<decltype(std::invoke_r<CV_Void>(f, 3))>);
+        };
+        check.template operator()<void>();
+        check.template operator()<void const>();
+        // volatile void is deprecated, so not testing it
+        // const volatile void is deprecated, so not testing it
+    }
+
+    // Make sure invoke_r forwards its arguments
+    {
+        struct NonCopyable {
+            NonCopyable() = default;
+            NonCopyable(NonCopyable const&) = delete;
+            NonCopyable(NonCopyable&&) = default;
+        };
+        // Forward argument, with void return
+        {
+            bool was_called = false;
+            auto f = [&](NonCopyable) { was_called = true; };
+            std::invoke_r<void>(f, NonCopyable());
+            assert(was_called);
+        }
+        // Forward argument, with non-void return
+        {
+            bool was_called = false;
+            auto f = [&](NonCopyable) -> int { was_called = true; return 0; };
+            std::invoke_r<int>(f, NonCopyable());
+            assert(was_called);
+        }
+        // Forward function object, with void return
+        {
+            struct MoveOnlyVoidFunction {
+                bool& was_called;
+                constexpr void operator()() && { was_called = true; }
+            };
+            bool was_called = false;
+            std::invoke_r<void>(MoveOnlyVoidFunction{was_called});
+            assert(was_called);
+        }
+        // Forward function object, with non-void return
+        {
+            struct MoveOnlyIntFunction {
+                bool& was_called;
+                constexpr int operator()() && { was_called = true; return 0; }
+            };
+            bool was_called = false;
+            std::invoke_r<int>(MoveOnlyIntFunction{was_called});
+            assert(was_called);
+        }
+    }
+
+    // Make sure invoke_r performs an implicit conversion of the result
+    {
+        struct Convertible {
+            constexpr operator int() const { return 42; }
+        };
+        auto f = []() -> Convertible { return Convertible{}; };
+        int result = std::invoke_r<int>(f);
+        assert(result == 42);
+    }
+
+    // Note: We don't test that `std::invoke_r` works with all kinds of callable types here,
+    //       since that is extensively tested in the `std::invoke` tests.
+
+    return true;
+}
+
+int main(int, char**) {
+    test();
+    static_assert(test());
+    return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.temporary.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.temporary.verify.cpp
new file mode 100644
index 0000000..2506ea0
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke_r.temporary.verify.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// <functional>
+
+// template<class R, class F, class... Args>
+// constexpr R invoke_r(F&& f, Args&&... args)              // C++23
+//     noexcept(is_nothrow_invocable_r_v<R, F, Args...>);
+//
+// Make sure that we diagnose when std::invoke_r is used with a return type that
+// would yield a dangling reference to a temporary.
+
+// TODO: We currently can't diagnose because we don't implement reference_converts_from_temporary.
+// XFAIL: *
+
+#include <functional>
+#include <cassert>
+
+#include "test_macros.h"
+
+void f() {
+    auto func = []() -> int { return 0; };
+    std::invoke_r<int&&>(func); // expected-error {{Returning from invoke_r would bind a temporary object}}
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
index a7665f1..1704eb6 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
@@ -39,7 +39,7 @@
 #include "test_iterators.h"
 
 template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
+    std::size_t operator () (T t) const { return static_cast<size_t>(t); }
 };
 
 template <typename Iter1, typename Iter2>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
index c70782c..3648be9 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
@@ -39,7 +39,7 @@
 #include "test_iterators.h"
 
 template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
+    std::size_t operator () (T t) const { return static_cast<size_t>(t); }
 };
 
 struct count_equal
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
index 8ada7ef..d0e6d5f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
@@ -38,7 +38,7 @@
 #include "test_iterators.h"
 
 template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
+    std::size_t operator () (T t) const { return static_cast<size_t>(t); }
 };
 
 template <typename Iter1, typename Iter2>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
index ec74f53..59b5b30 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
@@ -38,7 +38,7 @@
 #include "test_iterators.h"
 
 template <typename T> struct MyHash {
-    size_t operator () (T t) const { return static_cast<size_t>(t); }
+    std::size_t operator () (T t) const { return static_cast<size_t>(t); }
 };
 
 struct count_equal
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.verify.cpp
index 49c8284..b5d4a72 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.verify.cpp
@@ -17,12 +17,8 @@
 // This signature was removed in C++17
 
 #include <functional>
-#include <cassert>
+#include <memory>
 
-#include "min_allocator.h"
-
-int main(int, char**)
-{
+void f() {
     std::function<int(int)> f(std::allocator_arg, std::allocator<int>()); // expected-error {{no matching constructor for initialization of}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
index 1c54647..733a057 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
@@ -33,6 +33,12 @@
 };
 #endif
 
+template <class T>
+struct non_default_test_allocator : test_allocator<T> {
+  non_default_test_allocator() = delete;
+  using test_allocator<T>::test_allocator;
+};
+
 test_allocator_statistics alloc_stats;
 
 class DummyClass {};
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.verify.cpp
index 2353b51..88f8149 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.verify.cpp
@@ -17,15 +17,10 @@
 // This signature was removed in C++17
 
 #include <functional>
-#include <cassert>
 #include <memory>
 
-#include "test_macros.h"
-
 void foo(int) {}
 
-int main(int, char**)
-{
+void f() {
     std::function<void(int)> f(std::allocator_arg, std::allocator<int>(), foo); // expected-error {{no matching constructor for initialization of}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
index 4537e6d..00b3675 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
@@ -22,6 +22,12 @@
 #include "count_new.h"
 #include "../function_types.h"
 
+template <class T>
+struct non_default_test_allocator : test_allocator<T> {
+  non_default_test_allocator() = delete;
+  using test_allocator<T>::test_allocator;
+};
+
 class DummyClass {};
 
 template <class FuncType, class AllocType>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.verify.cpp
index 4263eee..acb42fc 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.verify.cpp
@@ -17,15 +17,10 @@
 // This signature was removed in C++17
 
 #include <functional>
-#include <cassert>
 #include <memory>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     typedef std::function<void(int)> F;
     F f1;
     F f2(std::allocator_arg, std::allocator<int>(), f1); // expected-error {{no matching constructor for initialization of}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.verify.cpp
index 6e9a6c4..d457e21 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.verify.cpp
@@ -17,12 +17,8 @@
 // This signature was removed in C++17
 
 #include <functional>
-#include <cassert>
+#include <memory>
 
-#include "min_allocator.h"
-
-int main(int, char**)
-{
+void f() {
     std::function<int(int)> f(std::allocator_arg, std::allocator<int>(), nullptr); // expected-error {{no matching constructor for initialization of}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
index b04b958..5fd6c96 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
@@ -16,13 +16,10 @@
 //
 // This signature was removed in C++17
 
-#include <cassert>
 #include <functional>
 #include <memory>
 #include <utility>
 
-#include "test_macros.h"
-
 class A
 {
     int data_[10];
@@ -52,9 +49,7 @@
 
 int g(int) { return 0; }
 
-int main(int, char**)
-{
+void f() {
     std::function<int(int)> f = A();
     std::function<int(int)> f2(std::allocator_arg, std::allocator<A>(), std::move(f)); // expected-error {{no matching constructor for initialization of}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/deduct_F.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/deduct_F.verify.cpp
index cc20a01..520e5f0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/deduct_F.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/deduct_F.verify.cpp
@@ -19,15 +19,13 @@
 // Make sure we stick to the specification.
 
 #include <functional>
-#include <type_traits>
 
 struct R { };
 struct f0 { R operator()() && { return {}; } };
 struct f1 { R operator()(int, ...) { return {}; } };
 
-int main(int, char**) {
+void f() {
     std::function f = f0{}; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
     std::function g = f1{}; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
     std::function h = nullptr; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
index 1f6e153..5e7947f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
@@ -16,17 +16,13 @@
 
 #include <functional>
 
-#include "test_macros.h"
-
 struct Predicate {
     typedef int first_argument_type;
     typedef int second_argument_type;
     bool operator()(first_argument_type, second_argument_type) const { return true; }
 };
 
-int main(int, char**) {
+void test() {
     std::binary_negate<Predicate> f((Predicate())); // expected-warning {{'binary_negate<Predicate>' is deprecated}}
     (void)f;
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
index e807a1e..4758a17 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
@@ -16,15 +16,11 @@
 
 #include <functional>
 
-#include "test_macros.h"
-
 struct Predicate {
     typedef int argument_type;
     bool operator()(argument_type) const { return true; }
 };
 
-int main(int, char**) {
+void f() {
     std::not1(Predicate()); // expected-warning {{'not1<Predicate>' is deprecated}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
index 7e079f5..e6e1637 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
@@ -16,16 +16,12 @@
 
 #include <functional>
 
-#include "test_macros.h"
-
 struct Predicate {
     typedef int first_argument_type;
     typedef int second_argument_type;
     bool operator()(first_argument_type, second_argument_type) const { return true; }
 };
 
-int main(int, char**) {
+void f() {
     std::not2(Predicate()); // expected-warning {{'not2<Predicate>' is deprecated}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
index 1cf1629..70c871f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
@@ -16,16 +16,12 @@
 
 #include <functional>
 
-#include "test_macros.h"
-
 struct Predicate {
     typedef int argument_type;
     bool operator()(argument_type) const { return true; }
 };
 
-int main(int, char**) {
+void test() {
     std::unary_negate<Predicate> f((Predicate())); // expected-warning {{'unary_negate<Predicate>' is deprecated}}
     (void)f;
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
index e5f3b13..f4743e1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
@@ -10,16 +10,22 @@
 
 // reference_wrapper
 
-// template <class... ArgTypes>
-//   requires Callable<T, ArgTypes&&...>
-//   Callable<T, ArgTypes&&...>::result_type
-//   operator()(ArgTypes&&... args) const;
+//  template <class... ArgTypes>
+//    constexpr typename result_of<T&(ArgTypes&&...)>::type               // constexpr since C++20
+//        operator() (ArgTypes&&...) const
+//            noexcept(is_nothrow_invocable_v<T&, ArgTypes...>);          // noexcept since C++17
 
 #include <functional>
 #include <cassert>
 
 #include "test_macros.h"
 
+#if TEST_STD_VER > 14
+#  define INVOKE_NOEXCEPT(expected, ...) static_assert(noexcept(__VA_ARGS__) == expected)
+#else
+#  define INVOKE_NOEXCEPT(expected, ...)
+#endif
+
 int count = 0;
 
 // 1 arg, return void
@@ -49,6 +55,7 @@
     std::reference_wrapper<void (int)> r1(f_void_1);
     int i = 2;
     r1(i);
+    INVOKE_NOEXCEPT(false, r1(i));
     assert(count == save_count+2);
     save_count = count;
     }
@@ -58,6 +65,7 @@
     std::reference_wrapper<void (*)(int)> r1(fp);
     int i = 3;
     r1(i);
+    INVOKE_NOEXCEPT(false, r1(i));
     assert(count == save_count+3);
     save_count = count;
     }
@@ -67,6 +75,7 @@
     std::reference_wrapper<A_void_1> r1(a0);
     int i = 4;
     r1(i);
+    INVOKE_NOEXCEPT(false, r1(i));
     assert(count == save_count+4);
     save_count = count;
     }
@@ -76,10 +85,12 @@
     std::reference_wrapper<void (A_void_1::*)()> r1(fp);
     A_void_1 a;
     r1(a);
+    INVOKE_NOEXCEPT(false, r1(a));
     assert(count == save_count+1);
     save_count = count;
     A_void_1* ap = &a;
     r1(ap);
+    INVOKE_NOEXCEPT(false, r1(ap));
     assert(count == save_count+1);
     save_count = count;
     }
@@ -89,10 +100,12 @@
     std::reference_wrapper<void (A_void_1::*)() const> r1(fp);
     A_void_1 a;
     r1(a);
+    INVOKE_NOEXCEPT(false, r1(a));
     assert(count == save_count+1);
     save_count = count;
     A_void_1* ap = &a;
     r1(ap);
+    INVOKE_NOEXCEPT(false, r1(ap));
     assert(count == save_count+1);
     save_count = count;
     }
@@ -126,6 +139,7 @@
     std::reference_wrapper<int (int)> r1(f_int_1);
     int i = 2;
     assert(r1(i) == 3);
+    INVOKE_NOEXCEPT(false, r1(i));
     }
     // function pointer
     {
@@ -133,6 +147,7 @@
     std::reference_wrapper<int (*)(int)> r1(fp);
     int i = 3;
     assert(r1(i) == 4);
+    INVOKE_NOEXCEPT(false, r1(i));
     }
     // functor
     {
@@ -140,6 +155,7 @@
     std::reference_wrapper<A_int_1> r1(a0);
     int i = 4;
     assert(r1(i) == 3);
+    INVOKE_NOEXCEPT(false, r1(i));
     }
     // member function pointer
     {
@@ -147,8 +163,10 @@
     std::reference_wrapper<int (A_int_1::*)()> r1(fp);
     A_int_1 a;
     assert(r1(a) == 3);
+    INVOKE_NOEXCEPT(false, r1(a));
     A_int_1* ap = &a;
     assert(r1(ap) == 3);
+    INVOKE_NOEXCEPT(false, r1(ap));
     }
     // const member function pointer
     {
@@ -156,8 +174,10 @@
     std::reference_wrapper<int (A_int_1::*)() const> r1(fp);
     A_int_1 a;
     assert(r1(a) == 4);
+    INVOKE_NOEXCEPT(false, r1(a));
     A_int_1* ap = &a;
     assert(r1(ap) == 4);
+    INVOKE_NOEXCEPT(false, r1(ap));
     }
     // member data pointer
     {
@@ -165,12 +185,14 @@
     std::reference_wrapper<int A_int_1::*> r1(fp);
     A_int_1 a;
     assert(r1(a) == 5);
+    INVOKE_NOEXCEPT(true, r1(a));
     r1(a) = 6;
     assert(r1(a) == 6);
     A_int_1* ap = &a;
     assert(r1(ap) == 6);
     r1(ap) = 7;
     assert(r1(ap) == 7);
+    INVOKE_NOEXCEPT(true, r1(ap));
     }
 }
 
@@ -202,6 +224,7 @@
     int i = 2;
     int j = 3;
     r1(i, j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     assert(count == save_count+5);
     save_count = count;
     }
@@ -212,6 +235,7 @@
     int i = 3;
     int j = 4;
     r1(i, j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     assert(count == save_count+7);
     save_count = count;
     }
@@ -222,6 +246,7 @@
     int i = 4;
     int j = 5;
     r1(i, j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     assert(count == save_count+9);
     save_count = count;
     }
@@ -236,6 +261,7 @@
     save_count = count;
     A_void_2* ap = &a;
     r1(ap, i);
+    INVOKE_NOEXCEPT(false, r1(ap, i));
     assert(count == save_count+3);
     save_count = count;
     }
@@ -246,10 +272,12 @@
     A_void_2 a;
     int i = 4;
     r1(a, i);
+    INVOKE_NOEXCEPT(false, r1(a, i));
     assert(count == save_count+4);
     save_count = count;
     A_void_2* ap = &a;
     r1(ap, i);
+    INVOKE_NOEXCEPT(false, r1(ap, i));
     assert(count == save_count+4);
     save_count = count;
     }
@@ -274,7 +302,7 @@
 };
 
 void
-testint_2()
+test_int_2()
 {
     // function
     {
@@ -282,6 +310,7 @@
     int i = 2;
     int j = 3;
     assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     }
     // function pointer
     {
@@ -290,6 +319,7 @@
     int i = 3;
     int j = 4;
     assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     }
     // functor
     {
@@ -298,6 +328,7 @@
     int i = 4;
     int j = 5;
     assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(false, r1(i, j));
     }
     // member function pointer
     {
@@ -306,8 +337,10 @@
     A_int_2 a;
     int i = 3;
     assert(r1(a, i) == i+1);
+    INVOKE_NOEXCEPT(false, r1(a, i));
     A_int_2* ap = &a;
     assert(r1(ap, i) == i+1);
+    INVOKE_NOEXCEPT(false, r1(ap, i));
     }
     // const member function pointer
     {
@@ -316,17 +349,357 @@
     A_int_2 a;
     int i = 4;
     assert(r1(a, i) == i+2);
+    INVOKE_NOEXCEPT(false, r1(a, i));
     A_int_2* ap = &a;
     assert(r1(ap, i) == i+2);
+    INVOKE_NOEXCEPT(false, r1(ap, i));
     }
 }
 
+#if TEST_STD_VER >= 11
+
+// 1 arg, return void, noexcept
+
+void f_void_1_noexcept(int i) noexcept
+{
+    count += i;
+}
+
+struct A_void_1_noexcept
+{
+    void operator()(int i) noexcept
+    {
+        count += i;
+    }
+
+    void mem1() noexcept {++count;}
+    void mem2() const noexcept {++count;}
+};
+
+void
+test_void_1_noexcept()
+{
+    int save_count = count;
+    // function
+    {
+    std::reference_wrapper<void (int) noexcept> r1(f_void_1_noexcept);
+    int i = 2;
+    r1(i);
+    INVOKE_NOEXCEPT(true, r1(i));
+    assert(count == save_count+2);
+    save_count = count;
+    }
+    // function pointer
+    {
+    void (*fp)(int) noexcept = f_void_1_noexcept;
+    std::reference_wrapper<void (*)(int) noexcept> r1(fp);
+    int i = 3;
+    r1(i);
+    INVOKE_NOEXCEPT(true, r1(i));
+    assert(count == save_count+3);
+    save_count = count;
+    }
+    // functor
+    {
+    A_void_1_noexcept a0;
+    std::reference_wrapper<A_void_1_noexcept> r1(a0);
+    int i = 4;
+    r1(i);
+    INVOKE_NOEXCEPT(true, r1(i));
+    assert(count == save_count+4);
+    save_count = count;
+    }
+    // member function pointer
+    {
+    void (A_void_1_noexcept::*fp)() noexcept = &A_void_1_noexcept::mem1;
+    std::reference_wrapper<void (A_void_1_noexcept::*)() noexcept> r1(fp);
+    A_void_1_noexcept a;
+    r1(a);
+    INVOKE_NOEXCEPT(true, r1(a));
+    assert(count == save_count+1);
+    save_count = count;
+    A_void_1_noexcept* ap = &a;
+    r1(ap);
+    INVOKE_NOEXCEPT(true, r1(ap));
+    assert(count == save_count+1);
+    save_count = count;
+    }
+    // const member function pointer
+    {
+    void (A_void_1_noexcept::*fp)() const noexcept = &A_void_1_noexcept::mem2;
+    std::reference_wrapper<void (A_void_1_noexcept::*)() const noexcept> r1(fp);
+    A_void_1_noexcept a;
+    r1(a);
+    INVOKE_NOEXCEPT(true, r1(a));
+    assert(count == save_count+1);
+    save_count = count;
+    A_void_1_noexcept* ap = &a;
+    r1(ap);
+    INVOKE_NOEXCEPT(true, r1(ap));
+    assert(count == save_count+1);
+    save_count = count;
+    }
+}
+
+// 1 arg, return int, noexcept
+
+int f_int_1_noexcept(int i) noexcept
+{
+    return i + 1;
+}
+
+struct A_int_1_noexcept
+{
+    A_int_1_noexcept() : data_(5) {}
+    int operator()(int i) noexcept
+    {
+        return i - 1;
+    }
+
+    int mem1() noexcept {return 3;}
+    int mem2() const noexcept {return 4;}
+    int data_;
+};
+
+void
+test_int_1_noexcept()
+{
+    // function
+    {
+    std::reference_wrapper<int (int) noexcept> r1(f_int_1_noexcept);
+    int i = 2;
+    assert(r1(i) == 3);
+    INVOKE_NOEXCEPT(true, r1(i));
+    }
+    // function pointer
+    {
+    int (*fp)(int) noexcept = f_int_1_noexcept;
+    std::reference_wrapper<int (*)(int) noexcept> r1(fp);
+    int i = 3;
+    assert(r1(i) == 4);
+    INVOKE_NOEXCEPT(true, r1(i));
+    }
+    // functor
+    {
+    A_int_1_noexcept a0;
+    std::reference_wrapper<A_int_1_noexcept> r1(a0);
+    int i = 4;
+    assert(r1(i) == 3);
+    INVOKE_NOEXCEPT(true, r1(i));
+    }
+    // member function pointer
+    {
+    int (A_int_1_noexcept::*fp)() noexcept = &A_int_1_noexcept::mem1;
+    std::reference_wrapper<int (A_int_1_noexcept::*)() noexcept> r1(fp);
+    A_int_1_noexcept a;
+    assert(r1(a) == 3);
+    INVOKE_NOEXCEPT(true, r1(a));
+    A_int_1_noexcept* ap = &a;
+    assert(r1(ap) == 3);
+    INVOKE_NOEXCEPT(true, r1(ap));
+    }
+    // const member function pointer
+    {
+    int (A_int_1_noexcept::*fp)() const noexcept = &A_int_1_noexcept::mem2;
+    std::reference_wrapper<int (A_int_1_noexcept::*)() const noexcept> r1(fp);
+    A_int_1_noexcept a;
+    assert(r1(a) == 4);
+    INVOKE_NOEXCEPT(true, r1(a));
+    A_int_1_noexcept* ap = &a;
+    assert(r1(ap) == 4);
+    INVOKE_NOEXCEPT(true, r1(ap));
+    }
+    // member data pointer
+    {
+    int A_int_1_noexcept::*fp = &A_int_1_noexcept::data_;
+    std::reference_wrapper<int A_int_1_noexcept::*> r1(fp);
+    A_int_1_noexcept a;
+    assert(r1(a) == 5);
+    INVOKE_NOEXCEPT(true, r1(a));
+    r1(a) = 6;
+    assert(r1(a) == 6);
+    A_int_1_noexcept* ap = &a;
+    assert(r1(ap) == 6);
+    r1(ap) = 7;
+    assert(r1(ap) == 7);
+    INVOKE_NOEXCEPT(true, r1(ap));
+    }
+}
+
+// 2 arg, return void, noexcept
+
+void f_void_2_noexcept(int i, int j) noexcept
+{
+    count += i+j;
+}
+
+struct A_void_2_noexcept
+{
+    void operator()(int i, int j) noexcept
+    {
+        count += i+j;
+    }
+
+    void mem1(int i) noexcept {count += i;}
+    void mem2(int i) const noexcept {count += i;}
+};
+
+void
+test_void_2_noexcept()
+{
+    int save_count = count;
+    // function
+    {
+    std::reference_wrapper<void (int, int) noexcept> r1(f_void_2_noexcept);
+    int i = 2;
+    int j = 3;
+    r1(i, j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    assert(count == save_count+5);
+    save_count = count;
+    }
+    // function pointer
+    {
+    void (*fp)(int, int) noexcept = f_void_2_noexcept;
+    std::reference_wrapper<void (*)(int, int) noexcept> r1(fp);
+    int i = 3;
+    int j = 4;
+    r1(i, j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    assert(count == save_count+7);
+    save_count = count;
+    }
+    // functor
+    {
+    A_void_2_noexcept a0;
+    std::reference_wrapper<A_void_2_noexcept> r1(a0);
+    int i = 4;
+    int j = 5;
+    r1(i, j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    assert(count == save_count+9);
+    save_count = count;
+    }
+    // member function pointer
+    {
+    void (A_void_2_noexcept::*fp)(int) noexcept = &A_void_2_noexcept::mem1;
+    std::reference_wrapper<void (A_void_2_noexcept::*)(int) noexcept> r1(fp);
+    A_void_2_noexcept a;
+    int i = 3;
+    r1(a, i);
+    assert(count == save_count+3);
+    save_count = count;
+    A_void_2_noexcept* ap = &a;
+    r1(ap, i);
+    INVOKE_NOEXCEPT(true, r1(ap, i));
+    assert(count == save_count+3);
+    save_count = count;
+    }
+    // const member function pointer
+    {
+    void (A_void_2_noexcept::*fp)(int) const noexcept = &A_void_2_noexcept::mem2;
+    std::reference_wrapper<void (A_void_2_noexcept::*)(int) const noexcept> r1(fp);
+    A_void_2_noexcept a;
+    int i = 4;
+    r1(a, i);
+    INVOKE_NOEXCEPT(true, r1(a, i));
+    assert(count == save_count+4);
+    save_count = count;
+    A_void_2_noexcept* ap = &a;
+    r1(ap, i);
+    INVOKE_NOEXCEPT(true, r1(ap, i));
+    assert(count == save_count+4);
+    save_count = count;
+    }
+}
+
+// 2 arg, return int, noexcept
+
+int f_int_2_noexcept(int i, int j) noexcept
+{
+    return i+j;
+}
+
+struct A_int_2_noexcept
+{
+    int operator()(int i, int j) noexcept
+    {
+        return i+j;
+    }
+
+    int mem1(int i) noexcept {return i+1;}
+    int mem2(int i) const noexcept {return i+2;}
+};
+
+void
+test_int_2_noexcept()
+{
+    // function
+    {
+    std::reference_wrapper<int (int, int) noexcept> r1(f_int_2_noexcept);
+    int i = 2;
+    int j = 3;
+    assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    }
+    // function pointer
+    {
+    int (*fp)(int, int) noexcept = f_int_2_noexcept;
+    std::reference_wrapper<int (*)(int, int) noexcept> r1(fp);
+    int i = 3;
+    int j = 4;
+    assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    }
+    // functor
+    {
+    A_int_2_noexcept a0;
+    std::reference_wrapper<A_int_2_noexcept> r1(a0);
+    int i = 4;
+    int j = 5;
+    assert(r1(i, j) == i+j);
+    INVOKE_NOEXCEPT(true, r1(i, j));
+    }
+    // member function pointer
+    {
+    int(A_int_2_noexcept::*fp)(int) noexcept = &A_int_2_noexcept::mem1;
+    std::reference_wrapper<int (A_int_2_noexcept::*)(int) noexcept> r1(fp);
+    A_int_2_noexcept a;
+    int i = 3;
+    assert(r1(a, i) == i+1);
+    INVOKE_NOEXCEPT(true, r1(a, i));
+    A_int_2_noexcept* ap = &a;
+    assert(r1(ap, i) == i+1);
+    INVOKE_NOEXCEPT(true, r1(ap, i));
+    }
+    // const member function pointer
+    {
+    int (A_int_2_noexcept::*fp)(int) const noexcept = &A_int_2_noexcept::mem2;
+    std::reference_wrapper<int (A_int_2_noexcept::*)(int) const noexcept> r1(fp);
+    A_int_2_noexcept a;
+    int i = 4;
+    assert(r1(a, i) == i+2);
+    INVOKE_NOEXCEPT(true, r1(a, i));
+    A_int_2_noexcept* ap = &a;
+    assert(r1(ap, i) == i+2);
+    INVOKE_NOEXCEPT(true, r1(ap, i));
+    }
+}
+
+#endif // TEST_STD_VER >= 11
+
 int main(int, char**)
 {
     test_void_1();
     test_int_1();
     test_void_2();
-    testint_2();
+    test_int_2();
+#if TEST_STD_VER >= 11
+    test_void_1_noexcept();
+    test_int_1_noexcept();
+    test_void_2_noexcept();
+    test_int_2_noexcept();
+#endif // TEST_STD_VER >= 11
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.compile.fail.cpp
index 2e36b4c..4401bc1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.compile.fail.cpp
@@ -19,7 +19,7 @@
 int main(int, char**)
 {
     X x;
-    size_t h = std::hash<X>{} ( x );
+    std::size_t h = std::hash<X>{} ( x );
 
   return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
index 6dd14dc..54e9f25 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
@@ -23,7 +23,7 @@
 enum class Cardinals { zero, one, two, three, five=5 };
 enum class LongColors : short { red, orange, yellow, green, blue, indigo, violet };
 enum class ShortColors : long { red, orange, yellow, green, blue, indigo, violet };
-enum class EightBitColors : uint8_t { red, orange, yellow, green, blue, indigo, violet };
+enum class EightBitColors : std::uint8_t { red, orange, yellow, green, blue, indigo, violet };
 
 enum Fruits { apple, pear, grape, mango, cantaloupe };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/integral.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
index 2cfed3e..4d6bc17 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
@@ -44,7 +44,7 @@
         if (small)
         {
             const std::size_t result = h(t);
-            LIBCPP_ASSERT(result == static_cast<size_t>(t));
+            LIBCPP_ASSERT(result == static_cast<std::size_t>(t));
             ((void)result); // Prevent unused warning
         }
     }
@@ -72,43 +72,43 @@
 
 //  LWG #2119
     test<std::ptrdiff_t>();
-    test<size_t>();
+    test<std::size_t>();
 
-    test<int8_t>();
-    test<int16_t>();
-    test<int32_t>();
-    test<int64_t>();
+    test<std::int8_t>();
+    test<std::int16_t>();
+    test<std::int32_t>();
+    test<std::int64_t>();
 
-    test<int_fast8_t>();
-    test<int_fast16_t>();
-    test<int_fast32_t>();
-    test<int_fast64_t>();
+    test<std::int_fast8_t>();
+    test<std::int_fast16_t>();
+    test<std::int_fast32_t>();
+    test<std::int_fast64_t>();
 
-    test<int_least8_t>();
-    test<int_least16_t>();
-    test<int_least32_t>();
-    test<int_least64_t>();
+    test<std::int_least8_t>();
+    test<std::int_least16_t>();
+    test<std::int_least32_t>();
+    test<std::int_least64_t>();
 
-    test<intmax_t>();
-    test<intptr_t>();
+    test<std::intmax_t>();
+    test<std::intptr_t>();
 
-    test<uint8_t>();
-    test<uint16_t>();
-    test<uint32_t>();
-    test<uint64_t>();
+    test<std::uint8_t>();
+    test<std::uint16_t>();
+    test<std::uint32_t>();
+    test<std::uint64_t>();
 
-    test<uint_fast8_t>();
-    test<uint_fast16_t>();
-    test<uint_fast32_t>();
-    test<uint_fast64_t>();
+    test<std::uint_fast8_t>();
+    test<std::uint_fast16_t>();
+    test<std::uint_fast32_t>();
+    test<std::uint_fast64_t>();
 
-    test<uint_least8_t>();
-    test<uint_least16_t>();
-    test<uint_least32_t>();
-    test<uint_least64_t>();
+    test<std::uint_least8_t>();
+    test<std::uint_least16_t>();
+    test<std::uint_least32_t>();
+    test<std::uint_least64_t>();
 
-    test<uintmax_t>();
-    test<uintptr_t>();
+    test<std::uintmax_t>();
+    test<std::uintptr_t>();
 
 #ifndef TEST_HAS_NO_INT128
     test<__int128_t>();
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
index f607da7..10a30dc 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
@@ -27,9 +27,9 @@
 {
 //  Make a couple of sequences
     using int3    = std::make_integer_sequence<int, 3>;     // generates int:    0,1,2
-    using size7   = std::make_integer_sequence<size_t, 7>;  // generates size_t: 0,1,2,3,4,5,6
+    using size7   = std::make_integer_sequence<std::size_t, 7>;  // generates size_t: 0,1,2,3,4,5,6
     using size4   = std::make_index_sequence<4>;            // generates size_t: 0,1,2,3
-    using size2   = std::index_sequence_for<int, size_t>;   // generates size_t: 0,1
+    using size2   = std::index_sequence_for<int, std::size_t>;   // generates size_t: 0,1
     using intmix  = std::integer_sequence<int, 9, 8, 7, 2>; // generates int:    9,8,7,2
     using sizemix = std::index_sequence<1, 1, 2, 3, 5>;     // generates size_t: 1,1,2,3,5
 
@@ -37,19 +37,19 @@
     static_assert ( std::is_same<int3::value_type, int>::value, "int3 type wrong" );
     static_assert ( int3::size () == 3, "int3 size wrong" );
 
-    static_assert ( std::is_same<size7::value_type, size_t>::value, "size7 type wrong" );
+    static_assert ( std::is_same<size7::value_type, std::size_t>::value, "size7 type wrong" );
     static_assert ( size7::size () == 7, "size7 size wrong" );
 
-    static_assert ( std::is_same<size4::value_type, size_t>::value, "size4 type wrong" );
+    static_assert ( std::is_same<size4::value_type, std::size_t>::value, "size4 type wrong" );
     static_assert ( size4::size () == 4, "size4 size wrong" );
 
-    static_assert ( std::is_same<size2::value_type, size_t>::value, "size2 type wrong" );
+    static_assert ( std::is_same<size2::value_type, std::size_t>::value, "size2 type wrong" );
     static_assert ( size2::size () == 2, "size2 size wrong" );
 
     static_assert ( std::is_same<intmix::value_type, int>::value, "intmix type wrong" );
     static_assert ( intmix::size () == 4, "intmix size wrong" );
 
-    static_assert ( std::is_same<sizemix::value_type, size_t>::value, "sizemix type wrong" );
+    static_assert ( std::is_same<sizemix::value_type, std::size_t>::value, "sizemix type wrong" );
     static_assert ( sizemix::size () == 5, "sizemix size wrong" );
 
     auto tup = std::make_tuple ( 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
index e22bec1..c117744 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03
+
 // <memory>
 
 // struct allocator_arg_t { explicit allocator_arg_t() = default; };
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocate_at_least.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocate_at_least.pass.cpp
index c8e2394..ad9a238 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocate_at_least.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocate_at_least.pass.cpp
@@ -27,8 +27,8 @@
   using value_type = T;
   T t;
 
-  constexpr T* allocate(size_t) { return &t; }
-  constexpr void deallocate(T*, size_t) {}
+  constexpr T* allocate(std::size_t) { return &t; }
+  constexpr void deallocate(T*, std::size_t) {}
 };
 
 template <class T>
@@ -37,9 +37,9 @@
   T t1;
   T t2;
 
-  constexpr T* allocate(size_t) { return &t1; }
-  constexpr void deallocate(T*, size_t) {}
-  constexpr std::allocation_result<T*> allocate_at_least(size_t) {
+  constexpr T* allocate(std::size_t) { return &t1; }
+  constexpr void deallocate(T*, std::size_t) {}
+  constexpr std::allocation_result<T*> allocate_at_least(std::size_t) {
     return {&t2, 2};
   }
 };
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.verify.cpp
index 7e3c41c..adb4d69 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.verify.cpp
@@ -17,36 +17,18 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-#include <cassert>
 #include <cstddef>
-#include <cstdint>
 #include <memory>
 
-#include "test_macros.h"
-
 template <class T>
-struct A
-{
+struct A {
     typedef T value_type;
-
-    value_type* allocate(std::size_t n)
-    {
-        assert(n == 12);
-        return reinterpret_cast<value_type*>(static_cast<std::uintptr_t>(0xEEADBEEF));
-    }
-    value_type* allocate(std::size_t n, const void* p)
-    {
-        assert(n == 11);
-        assert(p == 0);
-        return reinterpret_cast<value_type*>(static_cast<std::uintptr_t>(0xFEADBEEF));
-    }
+    value_type* allocate(std::size_t n);
+    value_type* allocate(std::size_t n, const void* p);
 };
 
-int main(int, char**)
-{
+void f() {
     A<int> a;
     std::allocator_traits<A<int> >::allocate(a, 10);          // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::allocator_traits<A<int> >::allocate(a, 10, nullptr); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
index 301078e..3ede16a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
@@ -36,7 +36,7 @@
 {
     typedef T value_type;
 
-    TEST_CONSTEXPR_CXX20 size_t max_size() const
+    TEST_CONSTEXPR_CXX20 std::size_t max_size() const
     {
         return 100;
     }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
index d9d4fc3..5d200a4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
@@ -12,6 +12,7 @@
 
 #include <memory>
 #include <vector>
+#include <type_traits>
 
 #include "test_macros.h"
 
@@ -42,7 +43,9 @@
 test()
 {
     static_assert((std::uses_allocator<T, A>::value == Expected), "");
+    static_assert(std::is_base_of<std::integral_constant<bool, Expected>, std::uses_allocator<T, A> >::value, "");
 #if TEST_STD_VER > 14
+    ASSERT_SAME_TYPE(decltype(std::uses_allocator_v<T, A>), const bool);
     static_assert((std::uses_allocator_v<T, A> == Expected), "");
 #endif
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.constexpr.size.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.constexpr.size.verify.cpp
index 717ba0d..67ee2d8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.constexpr.size.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.constexpr.size.verify.cpp
@@ -13,7 +13,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-#include <cassert>
 #include <cstddef>
 #include <memory>
 
@@ -27,15 +26,13 @@
     A a;
     TEST_IGNORE_NODISCARD a.allocate(AT::max_size(a) + 1);           // just barely too large
     TEST_IGNORE_NODISCARD a.allocate(AT::max_size(a) * 2);           // significantly too large
-    TEST_IGNORE_NODISCARD a.allocate(((size_t) -1) / sizeof(T) + 1); // multiply will overflow
-    TEST_IGNORE_NODISCARD a.allocate((size_t) -1);                   // way too large
+    TEST_IGNORE_NODISCARD a.allocate(((std::size_t) -1) / sizeof(T) + 1); // multiply will overflow
+    TEST_IGNORE_NODISCARD a.allocate((std::size_t) -1);                   // way too large
 
     return true;
 }
 
-int main(int, char**)
-{
+void f() {
     static_assert(test<double>()); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
     LIBCPP_STATIC_ASSERT(test<const double>()); // expected-error-re {{{{(static_assert|static assertion)}} expression is not an integral constant expression}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
index 49c7a0b..244e980 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
@@ -26,15 +26,15 @@
 #endif
 
 #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
-static const size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
+static const std::size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
 #else
-static const size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
+static const std::size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
 #endif
 
-static const size_t OverAligned = MaxAligned * 2;
+static const std::size_t OverAligned = MaxAligned * 2;
 
 
-template <size_t Align>
+template <std::size_t Align>
 struct TEST_ALIGNAS(Align) AlignedType {
   char data;
   static int constructed;
@@ -42,11 +42,11 @@
   AlignedType(AlignedType const&) { ++constructed; }
   ~AlignedType() { --constructed; }
 };
-template <size_t Align>
+template <std::size_t Align>
 int AlignedType<Align>::constructed = 0;
 
 
-template <size_t Align>
+template <std::size_t Align>
 void test_aligned() {
   typedef AlignedType<Align> T;
   T::constructed = 0;
@@ -78,7 +78,7 @@
 }
 
 #if TEST_STD_VER > 17
-template <size_t Align>
+template <std::size_t Align>
 constexpr bool test_aligned_constexpr() {
     typedef AlignedType<Align> T;
     std::allocator<T> a;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
index 3622b7c..1913a0e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
@@ -19,7 +19,7 @@
 #include "test_macros.h"
 
 template <typename T>
-void test_max(size_t count)
+void test_max(std::size_t count)
 {
     std::allocator<T> a;
     try {
@@ -38,8 +38,8 @@
     A a;
     test_max<T> (AT::max_size(a) + 1);             // just barely too large
     test_max<T> (AT::max_size(a) * 2);             // significantly too large
-    test_max<T> (((size_t) -1) / sizeof(T) + 1);   // multiply will overflow
-    test_max<T> ((size_t) -1);                     // way too large
+    test_max<T> (((std::size_t) -1) / sizeof(T) + 1);   // multiply will overflow
+    test_max<T> ((std::size_t) -1);                     // way too large
 }
 
 int main(int, char**)
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.verify.cpp
index c19710a..b2b6f51 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.verify.cpp
@@ -14,14 +14,8 @@
 // T* allocate(size_t n);
 
 #include <memory>
-#include <cassert>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
+void f() {
     std::allocator<int> a;
     a.allocate(3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
-
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate_at_least.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate_at_least.pass.cpp
index 6ac63a4..05c66b0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate_at_least.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate_at_least.pass.cpp
@@ -25,14 +25,14 @@
 #endif
 
 #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
-static const size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
+static const std::size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
 #else
-static const size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
+static const std::size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
 #endif
 
-static const size_t OverAligned = MaxAligned * 2;
+static const std::size_t OverAligned = MaxAligned * 2;
 
-template <size_t Align>
+template <std::size_t Align>
 struct alignas(Align) AlignedType {
   char data;
   static int constructed;
@@ -40,11 +40,11 @@
   AlignedType(AlignedType const&) { ++constructed; }
   ~AlignedType() { --constructed; }
 };
-template <size_t Align>
+template <std::size_t Align>
 int AlignedType<Align>::constructed = 0;
 
 
-template <size_t Align>
+template <std::size_t Align>
 void test_aligned() {
   typedef AlignedType<Align> T;
   T::constructed = 0;
@@ -76,7 +76,7 @@
   }
 }
 
-template <size_t Align>
+template <std::size_t Align>
 constexpr bool test_aligned_constexpr() {
     typedef AlignedType<Align> T;
     std::allocator<T> a;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
index 901f047..9174929 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
@@ -27,7 +27,7 @@
 
 #include <memory>
 
-int main(int, char**) {
+void f() {
     {
         typedef std::allocator<char>::pointer Pointer;                  // expected-warning {{'pointer' is deprecated}}
         typedef std::allocator<char>::const_pointer ConstPointer;       // expected-warning {{'const_pointer' is deprecated}}
@@ -48,5 +48,4 @@
         // reference and const_reference are not provided by std::allocator<void>
         typedef std::allocator<void>::rebind<int>::other Rebind;        // expected-warning {{'rebind<int>' is deprecated}}
     }
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.removed_in_cxx20.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.removed_in_cxx20.verify.cpp
index 1d91a02..2fb7a60 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.removed_in_cxx20.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/default.allocator/allocator_types.removed_in_cxx20.verify.cpp
@@ -26,7 +26,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
 #include <memory>
-#include "test_macros.h"
 
 template <typename T>
 void check()
@@ -38,10 +37,8 @@
     typedef typename std::allocator<T>::template rebind<int>::other ARO; // expected-error 3 {{no member named 'rebind'}}
 }
 
-int main(int, char**)
-{
+void f() {
     check<char>();
     check<char const>();
     check<void>();
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/ranges_uninitialized_copy_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/ranges_uninitialized_copy_n.pass.cpp
index 013db78..097f88d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/ranges_uninitialized_copy_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/ranges_uninitialized_copy_n.pass.cpp
@@ -33,9 +33,9 @@
 // libc++-specific.
 LIBCPP_STATIC_ASSERT(std::is_class_v<decltype(std::ranges::uninitialized_copy_n)>);
 
-static_assert(std::is_invocable_v<decltype(std::ranges::uninitialized_copy_n), int*, size_t, long*, long*>);
+static_assert(std::is_invocable_v<decltype(std::ranges::uninitialized_copy_n), int*, std::size_t, long*, long*>);
 struct NotConvertibleFromInt {};
-static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_copy_n), int*, size_t, NotConvertibleFromInt*,
+static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_copy_n), int*, std::size_t, NotConvertibleFromInt*,
                                    NotConvertibleFromInt*>);
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/ranges_uninitialized_fill_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/ranges_uninitialized_fill_n.pass.cpp
index a905507..0e8846e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/ranges_uninitialized_fill_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/ranges_uninitialized_fill_n.pass.cpp
@@ -33,7 +33,7 @@
 LIBCPP_STATIC_ASSERT(std::is_class_v<decltype(std::ranges::uninitialized_fill_n)>);
 
 struct NotConvertibleFromInt {};
-static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_fill_n), NotConvertibleFromInt*, size_t, int>);
+static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_fill_n), NotConvertibleFromInt*, std::size_t, int>);
 
 int main(int, char**) {
   constexpr int value = 42;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.move/ranges_uninitialized_move_n.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.move/ranges_uninitialized_move_n.pass.cpp
index 09bdcf4..df79987 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.move/ranges_uninitialized_move_n.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.move/ranges_uninitialized_move_n.pass.cpp
@@ -34,9 +34,9 @@
 // libc++-specific.
 LIBCPP_STATIC_ASSERT(std::is_class_v<decltype(std::ranges::uninitialized_move_n)>);
 
-static_assert(std::is_invocable_v<decltype(std::ranges::uninitialized_move_n), int*, size_t, long*, long*>);
+static_assert(std::is_invocable_v<decltype(std::ranges::uninitialized_move_n), int*, std::size_t, long*, long*>);
 struct NotConvertibleFromInt {};
-static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_move_n), int*, size_t, NotConvertibleFromInt*,
+static_assert(!std::is_invocable_v<decltype(std::ranges::uninitialized_move_n), int*, std::size_t, NotConvertibleFromInt*,
                                    NotConvertibleFromInt*>);
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
index a4f534e..019a6aa 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
@@ -11,7 +11,7 @@
 // Aligned allocations are not supported on macOS < 10.13
 // Note: use 'unsupported' instead of 'xfail' to ensure
 // we won't pass prior to c++17.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
@@ -40,7 +40,7 @@
 {
     std::pair<A*, std::ptrdiff_t> ip = std::get_temporary_buffer<A>(5);
     assert(!(ip.first == nullptr) ^ (ip.second == 0));
-    assert(reinterpret_cast<uintptr_t>(ip.first) % alignof(A) == 0);
+    assert(reinterpret_cast<std::uintptr_t>(ip.first) % alignof(A) == 0);
     std::return_temporary_buffer(ip.first);
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
index fc1500f..707038e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
@@ -48,8 +48,8 @@
 }
 
 template <class T>
-struct std::hash<min_pointer<T, std::integral_constant<size_t, 1>>> {
-  size_t operator()(min_pointer<T, std::integral_constant<size_t, 1>> p) const TEST_NOEXCEPT_FALSE {
+struct std::hash<min_pointer<T, std::integral_constant<std::size_t, 1>>> {
+  std::size_t operator()(min_pointer<T, std::integral_constant<size_t, 1>> p) const TEST_NOEXCEPT_FALSE {
     if (!p) return 0;
     return std::hash<T*>{}(std::addressof(*p));
   }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
index 35671c4..b5abcb6 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
@@ -55,6 +55,16 @@
   }
 };
 
+// https://llvm.org/PR53368
+// Bogus unique_ptr-to-shared_ptr conversions should be forbidden
+#if TEST_STD_VER >= 17
+static_assert( std::is_assignable<std::shared_ptr<A>&,   std::unique_ptr<A>&&>::value, "");
+static_assert( std::is_assignable<std::shared_ptr<A[]>&, std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_assignable<std::shared_ptr<A>&,   std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_assignable<std::shared_ptr<B[]>&, std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_assignable<std::shared_ptr<B>&,   std::unique_ptr<A[]>&&>::value, "");
+#endif
+
 int main(int, char**)
 {
     {
@@ -126,40 +136,6 @@
     assert(B::count == 0);
     assert(A::count == 0);
 
-#ifdef _LIBCPP_VERSION // https://llvm.org/PR53368
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<B> p;
-      p = std::move(ptr);
-      assert(A::count == 8);
-      assert(B::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-    assert(B::count == 0);
-
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<A> p;
-      p = std::move(ptr);
-      assert(A::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-
-    {
-      std::unique_ptr<int[]> ptr(new int[8]);
-      std::shared_ptr<int> p;
-      p = std::move(ptr);
-    }
-#endif // _LIBCPP_VERSION
-
 #if TEST_STD_VER > 14
     {
       StatefulArrayDeleter<A> d;
@@ -172,22 +148,6 @@
     assert(A::count == 0);
     assert(B::count == 0);
 
-#ifdef _LIBCPP_VERSION // https://llvm.org/PR53368
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<B[]> p;
-      p = std::move(ptr);
-      assert(A::count == 8);
-      assert(B::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-    assert(B::count == 0);
-#endif // _LIBCPP_VERSION
-
     {
       std::unique_ptr<A[]> ptr(new A[8]);
       A* raw_ptr = ptr.get();
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
index ef3270e..87b0cbd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
@@ -10,8 +10,9 @@
 
 // template<class Y> explicit shared_ptr(Y* p);
 
-#include <memory>
 #include <cassert>
+#include <memory>
+#include <type_traits>
 
 #include "test_macros.h"
 
@@ -26,6 +27,25 @@
 
 int A::count = 0;
 
+struct Derived : A {};
+
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert( std::is_constructible<std::shared_ptr<int>,  int*>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<A>,  Derived*>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,  int*>::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( std::is_constructible<std::shared_ptr<int[]>,  int*>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,  int(*)[]>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[5]>, int*>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>, int(*)[5]>::value, "");
+#endif
+
+// Test explicit
+static_assert(std::is_constructible<std::shared_ptr<int>, int*>::value, "");
+static_assert(!std::is_convertible<int*, std::shared_ptr<int> >::value, "");
+
 int main(int, char**)
 {
     {
@@ -71,11 +91,18 @@
     }
 
     {
-          assert(A::count == 0);
+        assert(A::count == 0);
         std::shared_ptr<const A[]> pA(new A[8]);
         assert(pA.use_count() == 1);
         assert(A::count == 8);
     }
+
+    {
+        assert(A::count == 0);
+        std::shared_ptr<A> pA(new Derived);
+        assert(pA.use_count() == 1);
+        assert(A::count == 1);
+    }
 #endif
 
     return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
index b3580e2..4631307 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
@@ -60,6 +60,22 @@
     void operator()(T *ptr) { delete ptr; }
 };
 
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert( std::is_constructible<std::shared_ptr<int>,  int*, test_deleter<int> >::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>,  int*, bad_deleter>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<Base>,  Derived*, test_deleter<Base> >::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,  int*, test_deleter<A> >::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( std::is_constructible<std::shared_ptr<int[]>,  int*, test_deleter<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,  int*, bad_deleter>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,  int(*)[], test_deleter<int>>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[5]>, int*, test_deleter<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>, int*, bad_deleter>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>, int(*)[5], test_deleter<int>>::value, "");
+#endif
+
 int main(int, char**)
 {
     {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
index 2fc2528..6d66e05 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
@@ -60,6 +60,23 @@
     void operator()(T *ptr) { delete ptr; }
 };
 
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert( std::is_constructible<std::shared_ptr<int>,  int*, test_deleter<int>, test_allocator<int> >::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>,  int*, bad_deleter, test_allocator<int> >::value, "");
+static_assert( std::is_constructible<std::shared_ptr<Base>,  Derived*, test_deleter<Base>, test_allocator<Base> >::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,  int*, test_deleter<A>, test_allocator<A> >::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( std::is_constructible<std::shared_ptr<int[]>,  int*, test_deleter<int>, test_allocator<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,  int*, bad_deleter, test_allocator<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,  int(*)[], test_deleter<int>, test_allocator<int>>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[5]>, int*, test_deleter<int>, test_allocator<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>, int*, bad_deleter, test_allocator<int>>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>, int(*)[5], test_deleter<int>, test_allocator<int>>::value, "");
+#endif
+
+
 int main(int, char**)
 {
     {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
index 26f381c..0681730 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
@@ -74,6 +74,23 @@
     }
 };
 
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::shared_ptr<long>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<B>,       const std::shared_ptr<A>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<const A>, const std::shared_ptr<A>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,       const std::shared_ptr<const A>&>::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::shared_ptr<int[]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::shared_ptr<int[5]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,   const std::shared_ptr<int>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[]>,   const std::shared_ptr<int[5]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  const std::shared_ptr<int>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  const std::shared_ptr<int[]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[7]>,  const std::shared_ptr<int[5]>&>::value, "");
+#endif
+
 int main(int, char**)
 {
     static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
index 84ec26e..10ccbc4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
@@ -55,6 +55,23 @@
 
 int C::count = 0;
 
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert(!std::is_constructible<std::shared_ptr<int>,     std::shared_ptr<long>&&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<B>,       std::shared_ptr<A>&&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<const A>, std::shared_ptr<A>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,       std::shared_ptr<const A>&&>::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert(!std::is_constructible<std::shared_ptr<int>,     std::shared_ptr<int[]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>,     std::shared_ptr<int[5]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,   std::shared_ptr<int>&&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[]>,   std::shared_ptr<int[5]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  std::shared_ptr<int>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  std::shared_ptr<int[]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[7]>,  std::shared_ptr<int[5]>&&>::value, "");
+#endif
+
 int main(int, char**)
 {
     static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
index 871aac6..9308bb3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
@@ -90,6 +90,16 @@
   int *moves_;
 };
 
+// https://llvm.org/PR53368
+// Bogus unique_ptr-to-shared_ptr conversions should be forbidden
+#if TEST_STD_VER >= 17
+static_assert( std::is_constructible<std::shared_ptr<A>,   std::unique_ptr<A>&&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<A[]>, std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,   std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<B[]>, std::unique_ptr<A[]>&&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<B>,   std::unique_ptr<A[]>&&>::value, "");
+#endif
+
 int main(int, char**)
 {
     {
@@ -169,36 +179,6 @@
     }
 
     assert(A::count == 0);
-#ifdef _LIBCPP_VERSION // https://llvm.org/PR53368
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<B> p(std::move(ptr));
-      assert(A::count == 8);
-      assert(B::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-    assert(B::count == 0);
-
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<A> p(std::move(ptr));
-      assert(A::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-
-    {
-      std::unique_ptr<int[]> ptr(new int[8]);
-      std::shared_ptr<int> p(std::move(ptr));
-    }
-#endif // _LIBCPP_VERSION
 
 #if TEST_STD_VER > 14
     {
@@ -211,21 +191,6 @@
     assert(A::count == 0);
     assert(B::count == 0);
 
-#ifdef _LIBCPP_VERSION // https://llvm.org/PR53368
-    {
-      std::unique_ptr<A[]> ptr(new A[8]);
-      A* raw_ptr = ptr.get();
-      std::shared_ptr<B[]> p(std::move(ptr));
-      assert(A::count == 8);
-      assert(B::count == 8);
-      assert(p.use_count() == 1);
-      assert(p.get() == raw_ptr);
-      assert(ptr.get() == 0);
-    }
-    assert(A::count == 0);
-    assert(B::count == 0);
-#endif // _LIBCPP_VERSION
-
     {
       std::unique_ptr<A[]> ptr(new A[8]);
       A* raw_ptr = ptr.get();
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
index 57d7cc5..f591813 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
@@ -12,8 +12,9 @@
 
 // template<class Y> explicit shared_ptr(const weak_ptr<Y>& r);
 
-#include <memory>
 #include <cassert>
+#include <memory>
+#include <type_traits>
 
 #include "test_macros.h"
 
@@ -40,6 +41,23 @@
 
 int A::count = 0;
 
+// https://llvm.org/PR60258
+// Invalid constructor SFINAE for std::shared_ptr's array ctors
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::weak_ptr<long>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<B>,       const std::weak_ptr<A>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<const A>, const std::weak_ptr<A>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<A>,       const std::weak_ptr<const A>&>::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::weak_ptr<int[]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int>,     const std::weak_ptr<int[5]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[]>,   const std::weak_ptr<int>&>::value, "");
+static_assert( std::is_constructible<std::shared_ptr<int[]>,   const std::weak_ptr<int[5]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  const std::weak_ptr<int>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[5]>,  const std::weak_ptr<int[]>&>::value, "");
+static_assert(!std::is_constructible<std::shared_ptr<int[7]>,  const std::weak_ptr<int[5]>&>::value, "");
+#endif
+
 int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
index 06e767f..79558cf 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
index 5842c47..f6e0f4e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_construct.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_construct.pass.cpp
index 3fa4ce7..4281cc1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_construct.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_construct.pass.cpp
@@ -122,8 +122,8 @@
   std::max_align_t y;
 };
 
-void test_aligned(void* p, size_t align) {
-  assert(reinterpret_cast<uintptr_t>(p) % align == 0);
+void test_aligned(void* p, std::size_t align) {
+  assert(reinterpret_cast<std::uintptr_t>(p) % align == 0);
 }
 
 int main(int, char**) {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp
index e69adee..27ff3cd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp
@@ -94,37 +94,62 @@
   testDefaultConstructor<bare_allocator<WithDefaultCtor>>();
 }
 
+struct CountDestructions {
+  int* destructions_;
+  constexpr CountDestructions() = default;
+  constexpr CountDestructions(int* d) : destructions_(d) { }
+  constexpr ~CountDestructions() { ++*destructions_; }
+};
+
 void testAllocatorOperationsCalled() {
   // single
   {
     test_allocator_statistics alloc_stats;
+    int destructions = 0;
     {
-      [[maybe_unused]] std::same_as<std::shared_ptr<int>> auto ptr =
-          std::allocate_shared_for_overwrite<int>(test_allocator<void>{&alloc_stats});
+      [[maybe_unused]] std::same_as<std::shared_ptr<CountDestructions>> auto ptr =
+          std::allocate_shared_for_overwrite<CountDestructions>(test_allocator<void>{&alloc_stats});
+      std::construct_at<CountDestructions>(ptr.get(), &destructions);
       assert(alloc_stats.alloc_count == 1);
+      assert(alloc_stats.construct_count == 0);
     }
+    assert(destructions == 1);
+    assert(alloc_stats.destroy_count == 0);
     assert(alloc_stats.alloc_count == 0);
   }
 
   // bounded array
   {
     test_allocator_statistics alloc_stats;
+    int destructions = 0;
     {
-      [[maybe_unused]] std::same_as<std::shared_ptr<int[2]>> auto ptr =
-          std::allocate_shared_for_overwrite<int[2]>(test_allocator<void>{&alloc_stats});
+      [[maybe_unused]] std::same_as<std::shared_ptr<CountDestructions[2]>> auto ptr =
+          std::allocate_shared_for_overwrite<CountDestructions[2]>(test_allocator<void>{&alloc_stats});
+      std::construct_at<CountDestructions>(ptr.get() + 0, &destructions);
+      std::construct_at<CountDestructions>(ptr.get() + 1, &destructions);
       assert(alloc_stats.alloc_count == 1);
+      assert(alloc_stats.construct_count == 0);
     }
+    assert(destructions == 2);
+    assert(alloc_stats.destroy_count == 0);
     assert(alloc_stats.alloc_count == 0);
   }
 
   // unbounded array
   {
     test_allocator_statistics alloc_stats;
+    int destructions = 0;
     {
-      [[maybe_unused]] std::same_as<std::shared_ptr<int[]>> auto ptr =
-          std::allocate_shared_for_overwrite<int[]>(test_allocator<void>{&alloc_stats}, 3);
+      [[maybe_unused]] std::same_as<std::shared_ptr<CountDestructions[]>> auto ptr =
+          std::allocate_shared_for_overwrite<CountDestructions[]>(test_allocator<void>{&alloc_stats}, 3);
+      std::construct_at<CountDestructions>(ptr.get() + 0, &destructions);
+      std::construct_at<CountDestructions>(ptr.get() + 1, &destructions);
+      std::construct_at<CountDestructions>(ptr.get() + 2, &destructions);
       assert(alloc_stats.alloc_count == 1);
+      assert(alloc_stats.construct_count == 0);
     }
+    assert(destructions == 3);
+    assert(alloc_stats.destroy_count == 0);
     assert(alloc_stats.alloc_count == 0);
   }
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
index 20fa508..60fb9bb 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
index 44365b0..01681cd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared_for_overwrite.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared_for_overwrite.pass.cpp
index 690a334..21e1786 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared_for_overwrite.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared_for_overwrite.pass.cpp
@@ -17,9 +17,9 @@
 
 #include <cassert>
 #include <concepts>
+#include <cstdlib>
 #include <cstring>
 #include <memory>
-#include <stdlib.h>
 #include <utility>
 
 #include "test_macros.h"
@@ -40,26 +40,26 @@
 
 // bounded array
 static_assert(HasMakeSharedForOverwrite<int[2]>);
-static_assert(!HasMakeSharedForOverwrite<int[2], size_t>);
+static_assert(!HasMakeSharedForOverwrite<int[2], std::size_t>);
 static_assert(!HasMakeSharedForOverwrite<int[2], int>);
 static_assert(!HasMakeSharedForOverwrite<int[2], int, int>);
 static_assert(HasMakeSharedForOverwrite<Foo[2]>);
-static_assert(!HasMakeSharedForOverwrite<Foo[2], size_t>);
+static_assert(!HasMakeSharedForOverwrite<Foo[2], std::size_t>);
 static_assert(!HasMakeSharedForOverwrite<Foo[2], int>);
 static_assert(!HasMakeSharedForOverwrite<Foo[2], int, int>);
 
 // unbounded array
-static_assert(HasMakeSharedForOverwrite<int[], size_t>);
-static_assert(HasMakeSharedForOverwrite<Foo[], size_t>);
+static_assert(HasMakeSharedForOverwrite<int[], std::size_t>);
+static_assert(HasMakeSharedForOverwrite<Foo[], std::size_t>);
 static_assert(!HasMakeSharedForOverwrite<int[]>);
 static_assert(!HasMakeSharedForOverwrite<Foo[]>);
-static_assert(!HasMakeSharedForOverwrite<int[], size_t, int>);
-static_assert(!HasMakeSharedForOverwrite<Foo[], size_t, int>);
+static_assert(!HasMakeSharedForOverwrite<int[], std::size_t, int>);
+static_assert(!HasMakeSharedForOverwrite<Foo[], std::size_t, int>);
 
 constexpr char pattern = 0xDE;
 
 void* operator new(std::size_t count) {
-  void* ptr = malloc(count);
+  void* ptr = std::malloc(count);
   for (std::size_t i = 0; i < count; ++i) {
     *(reinterpret_cast<char*>(ptr) + i) = pattern;
   }
@@ -68,7 +68,7 @@
 
 void* operator new[](std::size_t count) { return ::operator new(count); }
 
-void operator delete(void* ptr) noexcept { free(ptr); }
+void operator delete(void* ptr) noexcept { std::free(ptr); }
 
 void operator delete[](void* ptr) noexcept { ::operator delete(ptr); }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_helper.h b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_helper.h
new file mode 100644
index 0000000..27d7264
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_helper.h
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef TEST_STD_SHARED_PTR_RESET_H
+#define TEST_STD_SHARED_PTR_RESET_H
+
+#include <memory>
+#include <type_traits>
+
+template <class T, class... Args>
+std::false_type test_has_reset(...);
+
+template <class T, class... Args>
+typename std::enable_if<std::is_same<decltype(std::declval<T>().reset(std::declval<Args>()...)), void>::value,
+                        std::true_type>::type
+test_has_reset(int);
+
+template <class T, class... Args>
+using HasReset = decltype(test_has_reset<T, Args...>(0));
+
+#endif // TEST_STD_SHARED_PTR_RESET_H
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
index d764e8a..d1d19e4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
@@ -15,6 +15,7 @@
 #include <memory>
 #include <cassert>
 
+#include "reset_helper.h"
 #include "test_macros.h"
 
 struct B
@@ -40,6 +41,19 @@
 
 int A::count = 0;
 
+struct Derived : A {};
+
+static_assert( HasReset<std::shared_ptr<int>,  int*>::value, "");
+static_assert( HasReset<std::shared_ptr<A>,  Derived*>::value, "");
+static_assert(!HasReset<std::shared_ptr<A>,  int*>::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( HasReset<std::shared_ptr<int[]>,  int*>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[]>,  int(*)[]>::value, "");
+static_assert( HasReset<std::shared_ptr<int[5]>, int*>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[5]>, int(*)[5]>::value, "");
+#endif
+
 int main(int, char**)
 {
     {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
index 14c336b..d0375d3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
@@ -12,10 +12,11 @@
 
 // template<class Y, class D> void reset(Y* p, D d);
 
-#include <memory>
 #include <cassert>
-#include "test_macros.h"
+#include <memory>
 #include "deleter_types.h"
+#include "reset_helper.h"
+#include "test_macros.h"
 
 struct B
 {
@@ -40,6 +41,29 @@
 
 int A::count = 0;
 
+struct bad_ty { };
+struct bad_deleter
+{
+    void operator()(bad_ty) { }
+};
+
+struct Base { };
+struct Derived : Base { };
+
+static_assert( HasReset<std::shared_ptr<int>,  int*, test_deleter<int> >::value, "");
+static_assert(!HasReset<std::shared_ptr<int>,  int*, bad_deleter>::value, "");
+static_assert( HasReset<std::shared_ptr<Base>,  Derived*, test_deleter<Base> >::value, "");
+static_assert(!HasReset<std::shared_ptr<A>,  int*, test_deleter<A> >::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( HasReset<std::shared_ptr<int[]>,  int*, test_deleter<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[]>,  int*, bad_deleter>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[]>,  int(*)[], test_deleter<int>>::value, "");
+static_assert( HasReset<std::shared_ptr<int[5]>, int*, test_deleter<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[5]>, int*, bad_deleter>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[5]>, int(*)[5], test_deleter<int>>::value, "");
+#endif
+
 int main(int, char**)
 {
     {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
index a6ea07e..1cd42c0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
@@ -12,10 +12,11 @@
 
 // template<class Y, class D, class A> void reset(Y* p, D d, A a);
 
-#include <memory>
 #include <cassert>
+#include <memory>
 #include "test_macros.h"
 #include "deleter_types.h"
+#include "reset_helper.h"
 #include "test_allocator.h"
 
 struct B
@@ -41,6 +42,30 @@
 
 int A::count = 0;
 
+struct bad_ty { };
+
+struct bad_deleter
+{
+    void operator()(bad_ty) { }
+};
+
+struct Base { };
+struct Derived : Base { };
+
+static_assert( HasReset<std::shared_ptr<int>,  int*, test_deleter<int>, test_allocator<int> >::value, "");
+static_assert(!HasReset<std::shared_ptr<int>,  int*, bad_deleter, test_allocator<int> >::value, "");
+static_assert( HasReset<std::shared_ptr<Base>,  Derived*, test_deleter<Base>, test_allocator<Base> >::value, "");
+static_assert(!HasReset<std::shared_ptr<A>,  int*, test_deleter<A>, test_allocator<A> >::value, "");
+
+#if TEST_STD_VER >= 17
+static_assert( HasReset<std::shared_ptr<int[]>,  int*, test_deleter<int>, test_allocator<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[]>,  int*, bad_deleter, test_allocator<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[]>,  int(*)[], test_deleter<int>, test_allocator<int>>::value, "");
+static_assert( HasReset<std::shared_ptr<int[5]>, int*, test_deleter<int>, test_allocator<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[5]>, int*, bad_deleter, test_allocator<int>>::value, "");
+static_assert(!HasReset<std::shared_ptr<int[5]>, int(*)[5], test_deleter<int>, test_allocator<int>>::value, "");
+#endif
+
 int main(int, char**)
 {
     test_allocator_statistics alloc_stats;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
index 35d1160..51fe5dc 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
@@ -274,7 +274,7 @@
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
 #if TEST_STD_VER >= 11
-    const size_t alignment = TEST_ALIGNOF(std::max_align_t) > 16 ?
+    const std::size_t alignment = TEST_ALIGNOF(std::max_align_t) > 16 ?
         16 : TEST_ALIGNOF(std::max_align_t);
     static_assert(std::alignment_of<T1>::value == alignment, "");
 #else
@@ -292,7 +292,7 @@
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
 #if TEST_STD_VER >= 11
-    const size_t alignment = TEST_ALIGNOF(std::max_align_t) > 16 ?
+    const std::size_t alignment = TEST_ALIGNOF(std::max_align_t) > 16 ?
         16 : TEST_ALIGNOF(std::max_align_t);
     static_assert(std::alignment_of<T1>::value == alignment, "");
     static_assert(sizeof(T1) == 16 + alignment, "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_reference.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_reference.compile.pass.cpp
index 643d530..9332865 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_reference.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/common_reference.compile.pass.cpp
@@ -217,5 +217,3 @@
 static_assert(!has_type<std::common_reference<std::pair<int, X2>, std::pair<float, Z2>>>);
 static_assert(!has_type<std::common_reference<std::pair<int, X2>, int, X2>>);
 #endif
-
-int main(int, char**) { return 0; }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/objc_support.compile.pass.mm b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/objc_support.compile.pass.mm
new file mode 100644
index 0000000..e1fb119
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.trans/objc_support.compile.pass.mm
@@ -0,0 +1,106 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: objective-c++
+
+// Simple test to check that type traits support Objective-C types.
+
+#include <type_traits>
+#include "test_macros.h"
+
+@interface I;
+@end
+
+// add_pointer
+static_assert(std::is_same<std::add_pointer<id>::type, id*>::value, "");
+static_assert(std::is_same<std::add_pointer<I>::type, I*>::value, "");
+
+// add_lvalue_reference
+static_assert(std::is_same<std::add_lvalue_reference<id>::type, id&>::value, "");
+static_assert(std::is_same<std::add_lvalue_reference<I>::type, I&>::value, "");
+
+// add_rvalue_reference
+static_assert(std::is_same<std::add_rvalue_reference<id>::type, id&&>::value, "");
+static_assert(std::is_same<std::add_rvalue_reference<I>::type, I&&>::value, "");
+
+// decay
+static_assert(std::is_same<std::decay<id>::type, id>::value, "");
+static_assert(std::is_same<std::decay<I>::type, I>::value, "");
+static_assert(std::is_same<std::decay<id(&)[5]>::type, id*>::value, "");
+
+// __libcpp_is_referenceable
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<id>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<id*>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<id&>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<id&&>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<I>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<I*>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<I&>::value, "");
+LIBCPP_STATIC_ASSERT(std::__libcpp_is_referenceable<I&&>::value, "");
+
+// remove_all_extents
+static_assert(std::is_same<std::remove_all_extents<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_all_extents<id[5]>::type, id>::value, "");
+static_assert(std::is_same<std::remove_all_extents<id[5][10]>::type, id>::value, "");
+static_assert(std::is_same<std::remove_all_extents<I>::type, I>::value, "");
+
+// remove_const
+static_assert(std::is_same<std::remove_const<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_const<const id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_const<I>::type, I>::value, "");
+static_assert(std::is_same<std::remove_const<const I>::type, I>::value, "");
+
+// remove_cv
+static_assert(std::is_same<std::remove_cv<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_cv<const volatile id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_cv<I>::type, I>::value, "");
+static_assert(std::is_same<std::remove_cv<const volatile I>::type, I>::value, "");
+
+#if TEST_STD_VER >= 20
+// remove_cvref
+static_assert(std::is_same<std::remove_cvref<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_cvref<const volatile id&>::type, id>::value, "");
+static_assert(std::is_same<std::remove_cvref<const volatile id&&>::type, id>::value, "");
+static_assert(std::is_same<std::remove_cvref<I>::type, I>::value, "");
+static_assert(std::is_same<std::remove_cvref<const volatile I&>::type, I>::value, "");
+static_assert(std::is_same<std::remove_cvref<const volatile I&&>::type, I>::value, "");
+#endif
+
+// remove_extent
+static_assert(std::is_same<std::remove_all_extents<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_all_extents<id[5]>::type, id>::value, "");
+static_assert(std::is_same<std::remove_all_extents<I>::type, I>::value, "");
+
+// remove_pointer
+static_assert(!std::is_same<std::remove_pointer<id>::type, id>::value, "");
+// The result of removing and re-adding pointer to `id` should be still `id`.
+static_assert(std::is_same<std::remove_pointer<id>::type*, id>::value, "");
+static_assert(std::is_same<std::add_pointer<std::remove_pointer<id>::type>::type, id>::value, "");
+static_assert(std::is_same<std::remove_pointer<std::add_pointer<id>::type>::type, id>::value, "");
+
+// remove_reference
+static_assert(std::is_same<std::remove_reference<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_reference<id&>::type, id>::value, "");
+static_assert(std::is_same<std::remove_reference<const id&>::type, const id>::value, "");
+static_assert(std::is_same<std::remove_reference<id&&>::type, id>::value, "");
+static_assert(std::is_same<std::remove_reference<const id&&>::type, const id>::value, "");
+static_assert(std::is_same<std::remove_reference<I>::type, I>::value, "");
+static_assert(std::is_same<std::remove_reference<I&>::type, I>::value, "");
+static_assert(std::is_same<std::remove_reference<const I&>::type, const I>::value, "");
+static_assert(std::is_same<std::remove_reference<I&&>::type, I>::value, "");
+static_assert(std::is_same<std::remove_reference<const I&&>::type, const I>::value, "");
+
+// remove_volatile
+static_assert(std::is_same<std::remove_volatile<id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_volatile<volatile id>::type, id>::value, "");
+static_assert(std::is_same<std::remove_volatile<I>::type, I>::value, "");
+static_assert(std::is_same<std::remove_volatile<volatile I>::type, I>::value, "");
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
index a1c24b7..6631895 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
@@ -43,8 +43,8 @@
 {
     test_alignment_of<int&, 4>();
     test_alignment_of<Class, 1>();
-    test_alignment_of<int*, sizeof(intptr_t)>();
-    test_alignment_of<const int*, sizeof(intptr_t)>();
+    test_alignment_of<int*, sizeof(std::intptr_t)>();
+    test_alignment_of<const int*, sizeof(std::intptr_t)>();
     test_alignment_of<char[3], 1>();
     test_alignment_of<int, 4>();
     test_alignment_of<double, TEST_ALIGNOF(double)>();
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
index 7f0439b..ab01a74 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_optional_access-missing
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
index ad1112f..954f399 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_optional_access-missing
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
index bb8a319..cb23e03 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.hash/hash.pass.cpp
@@ -27,7 +27,7 @@
 
 template <>
 struct hash<B> {
-  size_t operator()(B const&) noexcept(false) { return 0; }
+  std::size_t operator()(B const&) noexcept(false) { return 0; }
 };
 
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
index a627abd..375820a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
index 11783af..79a8cfc 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
index 3a627a2..17a1e94 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
@@ -40,6 +40,8 @@
     static bool dtor_called;
     Y() = default;
     Y(int) { TEST_THROW(6);}
+    Y(const Y&) = default;
+    Y& operator=(const Y&) = default;
     ~Y() {dtor_called = true;}
 };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
index 2323acf..0581fa3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
@@ -31,6 +31,8 @@
     constexpr X(int i, bool& dtor_called) : i_(i), dtor_called_(&dtor_called) {}
     constexpr X(std::initializer_list<int> il, bool& dtor_called)
     : i_(il.begin()[0]), j_(il.begin()[1]), dtor_called_(&dtor_called) {}
+    X(const X&) = default;
+    X& operator=(const X&) = default;
     TEST_CONSTEXPR_CXX20 ~X() {*dtor_called_ = true;}
 
     friend constexpr bool operator==(const X& x, const X& y)
@@ -60,6 +62,8 @@
     Z(int i) : i_(i) {}
     Z(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1])
         { TEST_THROW(6);}
+    Z(const Z&) = default;
+    Z& operator=(const Z&) = default;
     ~Z() {dtor_called = true;}
 
     friend bool operator==(const Z& x, const Z& y)
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
index e99c872..60e589b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
index ddfc491..32334a0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
index e4918f7..41b5633 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
index dddd8fa..d301212 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
index be127a6..c004427 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
@@ -29,6 +29,8 @@
 public:
     static bool dtor_called;
     X() = default;
+    X(const X&) = default;
+    X& operator=(const X&) = default;
     ~X() {dtor_called = true;}
 };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
index 22544c9..112ee21 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
@@ -23,6 +23,9 @@
 struct X
 {
     static bool dtor_called;
+    X() = default;
+    X(const X&) = default;
+    X& operator=(const X&) = default;
     ~X() {dtor_called = true;}
 };
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
index 8cd9bcb..d4c0e8f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
index 103a631..9349f1d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
index 7402e98..2831816 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
index 2885699..dabeced 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // <optional>
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // constexpr T& optional<T>::value() &&;
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
index 1bd688b..d6c770f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 //
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.verify.cpp
index d125eb0..46506e5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.verify.cpp
@@ -13,13 +13,12 @@
 // test op*()
 
 #include <memory>
-#include <cassert>
 
-int main(int, char**) {
+#include "test_macros.h"
+
+void f() {
   std::unique_ptr<int[]> p(new int(3));
   const std::unique_ptr<int[]>& cp = p;
   TEST_IGNORE_NODISCARD(*p);  // expected-error-re {{indirection requires pointer operand ('std::unique_ptr<int{{[ ]*}}[]>' invalid)}}
   TEST_IGNORE_NODISCARD(*cp); // expected-error-re {{indirection requires pointer operand ('const std::unique_ptr<int{{[ ]*}}[]>' invalid)}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.verify.cpp
index 3d1a5e0..5361c1f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.verify.cpp
@@ -13,13 +13,12 @@
 // test op->()
 
 #include <memory>
-#include <cassert>
 
 struct V {
   int member;
 };
 
-int main(int, char**) {
+void f() {
   std::unique_ptr<V[]> p;
   std::unique_ptr<V[]> const& cp = p;
 
@@ -28,6 +27,4 @@
 
   cp->member; // expected-error-re {{member reference type 'const std::unique_ptr<V{{[ ]*}}[]>' is not a pointer}}
               // expected-error@-1 {{no member named 'member'}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.default_init.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.default_init.pass.cpp
index 5f4fbd4..8011a37 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.default_init.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.default_init.pass.cpp
@@ -20,13 +20,13 @@
 #include <cassert>
 #include <concepts>
 #include <cstddef>
+#include <cstdlib>
 #include <memory>
-#include <stdlib.h>
 
 constexpr char pattern = 0xDE;
 
 void* operator new(std::size_t count) {
-  void* ptr = malloc(count);
+  void* ptr = std::malloc(count);
   for (std::size_t i = 0; i < count; ++i) {
     *(reinterpret_cast<char*>(ptr) + i) = pattern;
   }
@@ -35,7 +35,7 @@
 
 void* operator new[](std::size_t count) { return ::operator new(count); }
 
-void operator delete(void* ptr) noexcept { free(ptr); }
+void operator delete(void* ptr) noexcept { std::free(ptr); }
 
 void operator delete[](void* ptr) noexcept { ::operator delete(ptr); }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.pass.cpp
index 3f86904..06367fe 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique_for_overwrite.pass.cpp
@@ -42,21 +42,21 @@
 
 // template<class T>
 //   constexpr unique_ptr<T> make_unique_for_overwrite(size_t n);
-static_assert(HasMakeUniqueForOverwrite<int[], size_t>);
-static_assert(HasMakeUniqueForOverwrite<Foo[], size_t>);
+static_assert(HasMakeUniqueForOverwrite<int[], std::size_t>);
+static_assert(HasMakeUniqueForOverwrite<Foo[], std::size_t>);
 static_assert(!HasMakeUniqueForOverwrite<int[]>);
 static_assert(!HasMakeUniqueForOverwrite<Foo[]>);
-static_assert(!HasMakeUniqueForOverwrite<int[], size_t, int>);
-static_assert(!HasMakeUniqueForOverwrite<Foo[], size_t, int>);
+static_assert(!HasMakeUniqueForOverwrite<int[], std::size_t, int>);
+static_assert(!HasMakeUniqueForOverwrite<Foo[], std::size_t, int>);
 
 // template<class T, class... Args>
 //   unspecified make_unique_for_overwrite(Args&&...) = delete;
 static_assert(!HasMakeUniqueForOverwrite<int[2]>);
-static_assert(!HasMakeUniqueForOverwrite<int[2], size_t>);
+static_assert(!HasMakeUniqueForOverwrite<int[2], std::size_t>);
 static_assert(!HasMakeUniqueForOverwrite<int[2], int>);
 static_assert(!HasMakeUniqueForOverwrite<int[2], int, int>);
 static_assert(!HasMakeUniqueForOverwrite<Foo[2]>);
-static_assert(!HasMakeUniqueForOverwrite<Foo[2], size_t>);
+static_assert(!HasMakeUniqueForOverwrite<Foo[2], std::size_t>);
 static_assert(!HasMakeUniqueForOverwrite<Foo[2], int>);
 static_assert(!HasMakeUniqueForOverwrite<Foo[2], int, int>);
 
@@ -108,13 +108,13 @@
   inline static bool customNewCalled    = false;
   inline static bool customNewArrCalled = false;
 
-  static void* operator new(size_t n) {
+  static void* operator new(std::size_t n) {
     customNewCalled = true;
     return ::operator new(n);
     ;
   }
 
-  static void* operator new[](size_t n) {
+  static void* operator new[](std::size_t n) {
     customNewArrCalled = true;
     return ::operator new[](n);
   }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
index 327765b..2a80e2d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
@@ -8,11 +8,12 @@
 
 // bitset(string, pos, n, zero, one); // constexpr since C++23
 
-#include <bitset>
 #include <algorithm> // for 'min' and 'max'
+#include <bitset>
 #include <cassert>
 #include <stdexcept> // for 'invalid_argument'
 #include <string>
+#include <type_traits>
 
 #include "test_macros.h"
 
@@ -75,7 +76,7 @@
     // since it may not be well formed and can cause an error in the
     // non-immediate context.
     static_assert(!std::is_constructible<std::bitset<3>, Nonsense*>::value, "");
-    static_assert(!std::is_constructible<std::bitset<3>, Nonsense*, size_t, Nonsense&, Nonsense&>::value, "");
+    static_assert(!std::is_constructible<std::bitset<3>, Nonsense*, std::size_t, Nonsense&, Nonsense&>::value, "");
 }
 
 TEST_CONSTEXPR_CXX23 bool test() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
index 957bb67..e3a2114 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
@@ -43,7 +43,7 @@
   TypeID const* arg_types;
 };
 
-template <class Tp, size_t N>
+template <class Tp, std::size_t N>
 struct ConstructibleFromTuple<std::array<Tp, N>> {
 template <class ...Args>
   explicit ConstructibleFromTuple(Args&&... xargs)
@@ -61,12 +61,6 @@
     return std::make_from_tuple<Tp>(std::forward<Tuple>(tup)).args == tup;
 }
 
-// Needed by do_forwarding_test() since it compares pairs of different types.
-template <class T1, class T2, class U1, class U2>
-inline bool operator==(const std::pair<T1, T2>& lhs, const std::pair<U1, U2>& rhs) {
-    return lhs.first == rhs.first && lhs.second == rhs.second;
-}
-
 template <class ...ExpectTypes, class Tuple>
 bool do_forwarding_test(Tuple&& tup) {
     using RawTuple = std::decay_t<Tuple>;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/recursion_depth.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/recursion_depth.pass.cpp
index 339361a..df10df8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/recursion_depth.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/recursion_depth.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 #include <utility>
 
-template <size_t... I>
+template <std::size_t... I>
 constexpr void CreateTuple(std::index_sequence<I...>) {
   std::tuple<decltype(I)...> tuple(I...);
   assert(std::get<0>(tuple) == 0);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
index 2236b6d..c92ad4b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
@@ -24,7 +24,7 @@
 
 #include "test_macros.h"
 
-template <class T, std::size_t N, class U, size_t idx>
+template <class T, std::size_t N, class U, std::size_t idx>
 void test()
 {
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.ranges.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.ranges.pass.cpp
index 36f7745..716acbf 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.ranges.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.ranges.pass.cpp
@@ -22,8 +22,8 @@
 class SizedSentinel {
 public:
     constexpr bool operator==(int*) const;
-    friend constexpr ptrdiff_t operator-(const SizedSentinel&, int*);
-    friend constexpr ptrdiff_t operator-(int*, const SizedSentinel&);
+    friend constexpr std::ptrdiff_t operator-(const SizedSentinel&, int*);
+    friend constexpr std::ptrdiff_t operator-(int*, const SizedSentinel&);
 };
 
 static_assert(std::sized_sentinel_for<SizedSentinel, Iterator>);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
index 458e4ff..243f162 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
@@ -23,7 +23,7 @@
 
 #include "test_macros.h"
 
-template <class T, std::size_t N, class U, size_t idx>
+template <class T, std::size_t N, class U, std::size_t idx>
 void test()
 {
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
index cde87e1..a2a65e0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
@@ -27,7 +27,7 @@
 template <>
 struct std::tuple_size<Dummy1> {
 public:
-  static size_t value;
+  static std::size_t value;
 };
 
 template <>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
index c0ec0ca..cb8d3e7 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
@@ -22,7 +22,7 @@
 
 #include "test_macros.h"
 
-template <class T, size_t Size = sizeof(std::tuple_size<T>)>
+template <class T, std::size_t Size = sizeof(std::tuple_size<T>)>
 constexpr bool is_complete(int) { static_assert(Size > 0, ""); return true; }
 template <class> constexpr bool is_complete(long) { return false; }
 template <class T> constexpr bool is_complete() { return is_complete<T>(0); }
@@ -31,7 +31,7 @@
 struct Dummy2 {};
 
 namespace std {
-template <> struct tuple_size<Dummy1> : public integral_constant<size_t, 0> {};
+template <> struct tuple_size<Dummy1> : public integral_constant<std::size_t, 0> {};
 }
 
 template <class T>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
index eb87e0b..937d47a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
@@ -113,7 +113,7 @@
   int x;
 };
 
-template <size_t N>
+template <std::size_t N>
 int get(Test const&) { static_assert(N == 0, ""); return -1; }
 
 template <>
@@ -130,7 +130,7 @@
 template <>
 struct std::tuple_size<Test> {
 public:
-  static const size_t value = 1;
+  static const std::size_t value = 1;
 };
 
 void test_after_tuple_size_specialization() {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
index 02a02c9..df1f270 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
index 1f58228..fd69706 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
index f291489..2a99883 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
index 96742fc..6f10c60 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
index ece7594..f6063b0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
@@ -29,7 +28,7 @@
 #include "test_macros.h"
 #include "test_std_memory_resource.h"
 
-template <size_t S, size_t Align>
+template <std::size_t S, size_t Align>
 void testForSizeAndAlign() {
   struct T {
     alignas(Align) std::byte buf[S];
@@ -48,7 +47,7 @@
 }
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
-template <size_t S>
+template <std::size_t S>
 void testAllocForSizeThrows() {
   struct T {
     std::byte buf[S];
@@ -60,8 +59,8 @@
   Alloc a(&R);
 
   // Test that allocating exactly the max size does not throw.
-  size_t maxSize = Traits::max_size(a);
-  size_t sizeTypeMax = std::numeric_limits<std::size_t>::max();
+  std::size_t maxSize = Traits::max_size(a);
+  std::size_t sizeTypeMax = std::numeric_limits<std::size_t>::max();
   if (maxSize != sizeTypeMax) {
     // Test that allocating size_t(~0) throws bad alloc.
     try {
@@ -71,7 +70,7 @@
     }
 
     // Test that allocating even one more than the max size does throw.
-    size_t overSize = maxSize + 1;
+    std::size_t overSize = maxSize + 1;
     try {
       (void)a.allocate(overSize);
       assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
index a4db295..4bddd56 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
@@ -27,8 +26,8 @@
 
 template <class T>
 void test() {
-  size_t last_size      = 0;
-  size_t last_alignment = 0;
+  std::size_t last_size      = 0;
+  std::size_t last_alignment = 0;
   TrackingMemRes resource(&last_size, &last_alignment);
 
   std::pmr::polymorphic_allocator<T> allocator(&resource);
@@ -38,10 +37,10 @@
     auto ptr                                      = static_cast<char*>(allocation);
     std::fill(ptr, ptr + 13, '0');
     assert(last_size == 13);
-    assert(last_alignment == alignof(max_align_t));
+    assert(last_alignment == alignof(std::max_align_t));
     allocator.deallocate_bytes(allocation, 13);
     assert(last_size == 13);
-    assert(last_alignment == alignof(max_align_t));
+    assert(last_alignment == alignof(std::max_align_t));
   }
   {
     void* allocation = allocator.allocate_bytes(13, 64);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
index b061afb..ddf6541 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
@@ -27,8 +26,8 @@
 
 template <class T>
 void test() {
-  size_t last_size      = 0;
-  size_t last_alignment = 0;
+  std::size_t last_size      = 0;
+  std::size_t last_alignment = 0;
   TrackingMemRes resource(&last_size, &last_alignment);
 
   std::pmr::polymorphic_allocator<T> allocator(&resource);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
index 4f56b74..eafbc46 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -26,20 +25,38 @@
 
 int constructed = 0;
 
+template <int>
 struct default_constructible {
   default_constructible() : x(42) { ++constructed; }
   int x = 0;
 };
 
 int main(int, char**) {
-  // pair<default_constructible, default_constructible> as T()
+  // pair<default_constructible, default_constructible>
   {
-    typedef default_constructible T;
+    typedef default_constructible<0> T;
     typedef std::pair<T, T> P;
     typedef std::pmr::polymorphic_allocator<void> A;
     alignas(P) char buffer[sizeof(P)];
     P* ptr = reinterpret_cast<P*>(buffer);
     A a;
+    constructed = 0;
+    a.construct(ptr);
+    assert(constructed == 2);
+    assert(ptr->first.x == 42);
+    assert(ptr->second.x == 42);
+  }
+
+  // pair<default_constructible<0>, default_constructible<1>>
+  {
+    typedef default_constructible<0> T;
+    typedef default_constructible<1> U;
+    typedef std::pair<T, U> P;
+    typedef std::pmr::polymorphic_allocator<void> A;
+    alignas(P) char buffer[sizeof(P)];
+    P* ptr = reinterpret_cast<P*>(buffer);
+    A a;
+    constructed = 0;
     a.construct(ptr);
     assert(constructed == 2);
     assert(ptr->first.x == 42);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
index 522f962..ed2f541 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
index 00bb667..a8ac09c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
index 6d39a7e..e8a3c62 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
index 619c554..d75a94a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
index 30b4374..88e1632 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
index 8b79616..15c4629 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
index e7884c9..3ad5d44 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "test_std_memory_resource.h"
 
-template <size_t S, size_t Align>
+template <std::size_t S, size_t Align>
 void testForSizeAndAlign() {
   struct T {
     alignas(Align) std::byte buf[S];
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
index 67d552c..0e5175c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// UNSUPPORTED: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
index 985dda2..0c2605b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
index 463a815..c4fcca1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
@@ -27,8 +26,8 @@
 
 template <class T>
 void test() {
-  size_t last_size      = 0;
-  size_t last_alignment = 0;
+  std::size_t last_size      = 0;
+  std::size_t last_alignment = 0;
   TrackingMemRes resource(&last_size, &last_alignment);
 
   std::pmr::polymorphic_allocator<T> allocator(&resource);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
index a6ed1f5..dc5f6ef 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
index 5b2551e..b3aa171 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/tracking_mem_res.h b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/tracking_mem_res.h
index d0b9eab..e78d988 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/tracking_mem_res.h
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/tracking_mem_res.h
@@ -9,23 +9,24 @@
 #ifndef TRACKING_MEM_RES_H
 #define TRACKING_MEM_RES_H
 
+#include <cstddef>
 #include <memory_resource>
 
 class TrackingMemRes : public std::pmr::memory_resource {
 public:
-  TrackingMemRes(size_t* last_size, size_t* last_alginment) : last_size_(last_size), last_alginment_(last_alginment) {}
+  TrackingMemRes(std::size_t* last_size, size_t* last_alginment) : last_size_(last_size), last_alginment_(last_alginment) {}
 
 private:
-  size_t* last_size_;
-  size_t* last_alginment_;
-  void* do_allocate(size_t size, size_t alignment) override {
+  std::size_t* last_size_;
+  std::size_t* last_alginment_;
+  void* do_allocate(std::size_t size, size_t alignment) override {
     *last_size_      = size;
     *last_alginment_ = alignment;
 
     return std::pmr::new_delete_resource()->allocate(size, alignment);
   }
 
-  void do_deallocate(void* ptr, size_t size, size_t alignment) override {
+  void do_deallocate(void* ptr, std::size_t size, size_t alignment) override {
     *last_size_      = size;
     *last_alginment_ = alignment;
     std::pmr::new_delete_resource()->deallocate(ptr, size, alignment);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
index 3fe8a45..c7f4946 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <deque>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
index e96b21e..8eacb29 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <deque>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
index 2a09354..7947ec4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <forward_list>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
index 9adabd4..32a5838 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <list>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
index fef4cb2..069cb44 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <list>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
index 0ba22fc..2633c8f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
index 452f922..07a2219 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
index 1414108..b2284ef 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-localization
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <regex>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
index 7b0a6aa..ec0db98 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
index b63677e..7dae37c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
index 9ae4b67..71f4de8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <string>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
index 2f70806..22c4369 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <string>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
index 0f660b5..b0dab6e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
index 8117539..2fd284f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_map>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
index 7f34fb2..3f70709 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
index 36cd6bf..a8f0c48 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_set>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
index 0caca07..df7543d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
index 330f4be..037a25b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <vector>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
index 1c46f5b..66f23b5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
index bd8b8e9..898cbf0 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -22,12 +21,12 @@
 #include "test_macros.h"
 
 class assert_on_compare : public std::pmr::memory_resource {
-  void* do_allocate(size_t, size_t) override {
+  void* do_allocate(std::size_t, size_t) override {
     assert(false);
     return nullptr;
   }
 
-  void do_deallocate(void*, size_t, size_t) override { assert(false); }
+  void do_deallocate(void*, std::size_t, size_t) override { assert(false); }
 
   bool do_is_equal(const std::pmr::memory_resource&) const noexcept override {
     assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
index fdaa398..aa2be02 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -24,12 +23,12 @@
 #include "test_macros.h"
 
 struct assert_on_compare : public std::pmr::memory_resource {
-  void* do_allocate(size_t, size_t) override {
+  void* do_allocate(std::size_t, size_t) override {
     assert(false);
     return nullptr;
   }
 
-  void do_deallocate(void*, size_t, size_t) override { assert(false); }
+  void do_deallocate(void*, std::size_t, size_t) override { assert(false); }
 
   bool do_is_equal(const std::pmr::memory_resource&) const noexcept override {
     assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
index ff93f82..463b0ee 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
index 8adebb7..f1c75e6 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
index f75198a..f7312fe 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
index d8f8dac..9ef6275 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-exceptions
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -27,9 +26,9 @@
   explicit repointable_resource(std::pmr::memory_resource* res) : which(res) {}
 
 private:
-  void* do_allocate(size_t size, size_t align) override { return which->allocate(size, align); }
+  void* do_allocate(std::size_t size, size_t align) override { return which->allocate(size, align); }
 
-  void do_deallocate(void* p, size_t size, size_t align) override { return which->deallocate(p, size, align); }
+  void do_deallocate(void* p, std::size_t size, size_t align) override { return which->deallocate(p, size, align); }
 
   bool do_is_equal(std::pmr::memory_resource const& rhs) const noexcept override { return which->is_equal(rhs); }
 };
@@ -49,7 +48,7 @@
   assert(res != buffer);
   assert(globalMemCounter.checkNewCalledEq(1));
   assert(globalMemCounter.checkDeleteCalledEq(0));
-  const size_t last_new_size = globalMemCounter.last_new_size;
+  const std::size_t last_new_size = globalMemCounter.last_new_size;
 
   upstream.which = std::pmr::null_memory_resource();
   try {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
index 446030e..549b487 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
index acd4ca5..6d2760b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
index ffe17d1..dbac78d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -30,7 +29,7 @@
   std::pmr::memory_resource& r1 = mono1;
 
   assert(globalMemCounter.checkNewCalledEq(0));
-  size_t next_buffer_size = 100;
+  std::size_t next_buffer_size = 100;
   void* ret               = r1.allocate(10, 1);
   assert(ret != nullptr);
   assert(globalMemCounter.checkNewCalledEq(1));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
index d2b8454..6e894a4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -25,7 +24,7 @@
   auto mono1                    = std::pmr::monotonic_buffer_resource(1024, std::pmr::new_delete_resource());
   std::pmr::memory_resource& r1 = mono1;
 
-  constexpr size_t big_alignment = 8 * alignof(std::max_align_t);
+  constexpr std::size_t big_alignment = 8 * alignof(std::max_align_t);
   static_assert(big_alignment > 4);
 
   void* ret = r1.allocate(2048, big_alignment);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
index 15b3336..8adc667 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -20,7 +19,7 @@
 #include "count_new.h"
 #include "test_macros.h"
 
-void test(size_t initial_buffer_size) {
+void test(std::size_t initial_buffer_size) {
   globalMemCounter.reset();
 
   auto mono1 = std::pmr::monotonic_buffer_resource(initial_buffer_size, std::pmr::new_delete_resource());
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
index 4263310..cae2545 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -19,12 +18,12 @@
 #include <cstddef> // size_t
 
 struct assert_on_compare : public std::pmr::memory_resource {
-  void* do_allocate(size_t, size_t) override {
+  void* do_allocate(std::size_t, size_t) override {
     assert(false);
     return nullptr;
   }
 
-  void do_deallocate(void*, size_t, size_t) override { assert(false); }
+  void do_deallocate(void*, std::size_t, size_t) override { assert(false); }
 
   bool do_is_equal(const std::pmr::memory_resource&) const noexcept override {
     assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
index 323bc43..fad096d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
index 6597768..9cb5de8 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
index 72a4bd9..a314f5f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
index 39f0a11..5ef7e3d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -23,12 +22,12 @@
 #include "count_new.h"
 
 class assert_on_compare : public std::pmr::memory_resource {
-  void* do_allocate(size_t, size_t) override {
+  void* do_allocate(std::size_t, size_t) override {
     assert(false);
     return nullptr;
   }
 
-  void do_deallocate(void*, size_t, size_t) override { assert(false); }
+  void do_deallocate(void*, std::size_t, size_t) override { assert(false); }
 
   bool do_is_equal(const std::pmr::memory_resource&) const noexcept override {
     assert(false);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
index fb90553..2e0dbf1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
index d962d7f..08b8be4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -21,9 +20,9 @@
 #include "count_new.h"
 #include "test_macros.h"
 
-bool is_aligned_to(void* p, size_t alignment) {
+bool is_aligned_to(void* p, std::size_t alignment) {
   void* p2     = p;
-  size_t space = 1;
+  std::size_t space = 1;
   void* result = std::align(alignment, 1, p2, space);
   return (result == p);
 }
@@ -34,7 +33,7 @@
   std::pmr::synchronized_pool_resource sync1(opts, std::pmr::new_delete_resource());
   std::pmr::memory_resource& r1 = sync1;
 
-  constexpr size_t big_alignment = 8 * alignof(std::max_align_t);
+  constexpr std::size_t big_alignment = 8 * alignof(std::max_align_t);
   static_assert(big_alignment > 4);
 
   assert(globalMemCounter.checkNewCalledEq(0));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
index 1fbc2b0..f52f07c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -21,9 +20,9 @@
 #include "count_new.h"
 #include "test_macros.h"
 
-static bool is_aligned_to(void* p, size_t alignment) {
+static bool is_aligned_to(void* p, std::size_t alignment) {
   void* p2     = p;
-  size_t space = 1;
+  std::size_t space = 1;
   void* result = std::align(alignment, 1, p2, space);
   return (result == p);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
index 26101d8..3742c37 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -22,9 +21,9 @@
 #include <vector>
 
 struct allocation_record {
-  size_t bytes;
-  size_t align;
-  explicit allocation_record(size_t b, size_t a) : bytes(b), align(a) {}
+  std::size_t bytes;
+  std::size_t align;
+  explicit allocation_record(std::size_t b, size_t a) : bytes(b), align(a) {}
   bool operator==(const allocation_record& rhs) const { return (bytes == rhs.bytes) && (align == rhs.align); }
   bool operator<(const allocation_record& rhs) const {
     if (bytes != rhs.bytes)
@@ -34,12 +33,12 @@
 };
 
 class test_resource : public std::pmr::memory_resource {
-  void* do_allocate(size_t bytes, size_t align) override {
+  void* do_allocate(std::size_t bytes, size_t align) override {
     void* result = std::pmr::new_delete_resource()->allocate(bytes, align);
     successful_allocations.emplace_back(bytes, align);
     return result;
   }
-  void do_deallocate(void* p, size_t bytes, size_t align) override {
+  void do_deallocate(void* p, std::size_t bytes, size_t align) override {
     deallocations.emplace_back(bytes, align);
     return std::pmr::new_delete_resource()->deallocate(p, bytes, align);
   }
@@ -70,7 +69,7 @@
       tr.deallocations.end()));
 }
 
-template <size_t Bytes, size_t Align>
+template <std::size_t Bytes, size_t Align>
 auto foo() {
   return [=](auto& mr) {
     void* p = mr.allocate(Bytes, Align);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
index 69d4f2e..730fb09 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
index a316750..c4b501c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -21,9 +20,9 @@
 #include "count_new.h"
 #include "test_macros.h"
 
-bool is_aligned_to(void* p, size_t alignment) {
+bool is_aligned_to(void* p, std::size_t alignment) {
   void* p2     = p;
-  size_t space = 1;
+  std::size_t space = 1;
   void* result = std::align(alignment, 1, p2, space);
   return (result == p);
 }
@@ -34,7 +33,7 @@
   auto unsync1                  = std::pmr::unsynchronized_pool_resource(opts, std::pmr::new_delete_resource());
   std::pmr::memory_resource& r1 = unsync1;
 
-  constexpr size_t big_alignment = 8 * alignof(std::max_align_t);
+  constexpr std::size_t big_alignment = 8 * alignof(std::max_align_t);
   static_assert(big_alignment > 4);
 
   assert(globalMemCounter.checkNewCalledEq(0));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
index 72087e8..cb6fc18 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -21,9 +20,9 @@
 #include "count_new.h"
 #include "test_macros.h"
 
-static bool is_aligned_to(void* p, size_t alignment) {
+static bool is_aligned_to(void* p, std::size_t alignment) {
   void* p2     = p;
-  size_t space = 1;
+  std::size_t space = 1;
   void* result = std::align(alignment, 1, p2, space);
   return (result == p);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
index 2863cba..5cbe3a4 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
@@ -22,9 +21,9 @@
 #include <vector>
 
 struct allocation_record {
-  size_t bytes;
-  size_t align;
-  explicit allocation_record(size_t b, size_t a) : bytes(b), align(a) {}
+  std::size_t bytes;
+  std::size_t align;
+  explicit allocation_record(std::size_t b, size_t a) : bytes(b), align(a) {}
   bool operator==(const allocation_record& rhs) const { return (bytes == rhs.bytes) && (align == rhs.align); }
   bool operator<(const allocation_record& rhs) const {
     if (bytes != rhs.bytes)
@@ -34,12 +33,12 @@
 };
 
 class test_resource : public std::pmr::memory_resource {
-  void* do_allocate(size_t bytes, size_t align) override {
+  void* do_allocate(std::size_t bytes, size_t align) override {
     void* result = std::pmr::new_delete_resource()->allocate(bytes, align);
     successful_allocations.emplace_back(bytes, align);
     return result;
   }
-  void do_deallocate(void* p, size_t bytes, size_t align) override {
+  void do_deallocate(void* p, std::size_t bytes, size_t align) override {
     deallocations.emplace_back(bytes, align);
     return std::pmr::new_delete_resource()->deallocate(p, bytes, align);
   }
@@ -70,7 +69,7 @@
       tr.deallocations.end()));
 }
 
-template <size_t Bytes, size_t Align>
+template <std::size_t Bytes, size_t Align>
 auto foo() {
   return [=](auto& mr) {
     void* p = mr.allocate(Bytes, Align);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
index d31cfda..9d60e35 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
index 5444d62..c8b9f1c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
index dde8faa..6008baf 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
index 1f1b2f8..f9ffa90 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
index 4e2bd7c..0dd35f5 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
index 0844294..7034ceb 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.verify.cpp
similarity index 71%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.verify.cpp
index e186514..a920c69 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/get_const.verify.cpp
@@ -15,17 +15,9 @@
 //     get(const pair<T1, T2>&);
 
 #include <utility>
-#include <cassert>
 
-int main(int, char**)
-{
-    {
-        typedef std::pair<int, short> P;
-        const P p(3, 4);
-        assert(std::get<0>(p) == 3);
-        assert(std::get<1>(p) == 4);
-        std::get<0>(p) = 5;
-    }
-
-  return 0;
+void f() {
+  typedef std::pair<int, short> P;
+  const P p(3, 4);
+  std::get<0>(p) = 5; // expected-error {{cannot assign to return value}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.compile.fail.cpp
deleted file mode 100644
index 931ec31..0000000
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.compile.fail.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-#include <utility>
-#include <complex>
-
-#include <cassert>
-
-int main(int, char**)
-{
-    typedef std::complex<float> cf;
-    auto t1 = std::make_pair<int, double> ( 42, 3.4 );
-    assert (( std::get<cf>(t1) == cf {1,2} ));  // no such type
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.verify.cpp
similarity index 70%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.verify.cpp
index 559ff3c..cae19a1 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.verify.cpp
@@ -7,16 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
+
 #include <utility>
 #include <complex>
 
-#include <cassert>
-
-int main(int, char**)
-{
-    typedef std::unique_ptr<int> upint;
-    std::pair<upint, int> t(upint(new int(4)), 23);
-    upint p = std::get<upint>(t);
-
-  return 0;
+void f() {
+  typedef std::complex<float> cf;
+  auto t1 = std::make_pair<int, double>(42, 3.4);
+  (void)std::get<cf>(t1); // expected-error {{no matching function for call to 'get'}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.compile.fail.cpp
deleted file mode 100644
index aa6eaaa..0000000
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.compile.fail.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03, c++11
-#include <utility>
-#include <complex>
-
-#include <cassert>
-
-int main(int, char**)
-{
-    typedef std::complex<float> cf;
-    auto t1 = std::make_pair<int, int> ( 42, 43 );
-    assert ( std::get<int>(t1) == 42 ); // two ints
-
-  return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.verify.cpp
similarity index 70%
copy from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.verify.cpp
index 559ff3c..1ba894b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.verify.cpp
@@ -7,16 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
+
 #include <utility>
 #include <complex>
 
-#include <cassert>
-
-int main(int, char**)
-{
-    typedef std::unique_ptr<int> upint;
-    std::pair<upint, int> t(upint(new int(4)), 23);
-    upint p = std::get<upint>(t);
-
-  return 0;
+void f() {
+  typedef std::complex<float> cf;
+  auto t1 = std::make_pair<int, int> ( 42, 43 );
+  (void)std::get<int>(t1); // expected-error {{call to 'get' is ambiguous}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.verify.cpp
similarity index 66%
copy from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
copy to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.verify.cpp
index 559ff3c..d2d9b67 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.compile.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.verify.cpp
@@ -7,16 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
+
+#include <memory>
 #include <utility>
-#include <complex>
 
-#include <cassert>
-
-int main(int, char**)
-{
-    typedef std::unique_ptr<int> upint;
-    std::pair<upint, int> t(upint(new int(4)), 23);
-    upint p = std::get<upint>(t);
-
-  return 0;
+void f() {
+  typedef std::unique_ptr<int> Ptr;
+  std::pair<Ptr, int> t(Ptr(new int(4)), 23);
+  Ptr p = std::get<Ptr>(t); // expected-error {{call to implicitly-deleted copy constructor of 'Ptr'}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.verify.cpp
similarity index 70%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.verify.cpp
index a9a16a4..4f70e9f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_element.verify.cpp
@@ -14,10 +14,7 @@
 
 #include <utility>
 
-int main(int, char**)
-{
-    typedef std::pair<int, short> T;
-    std::tuple_element<2, T>::type foo; // expected-error@*:* {{Index out of bounds in std::tuple_element<std::pair<T1, T2>>}}
-
-    return 0;
+void f() {
+  typedef std::pair<int, short> T;
+  std::tuple_element<2, T>::type foo; // expected-error@*:* {{Index out of bounds in std::tuple_element<std::pair<T1, T2>>}}
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.verify.cpp
similarity index 94%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.verify.cpp
index 3a7af09..a72a99d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct_t.verify.cpp
@@ -17,9 +17,4 @@
 
 #include <utility>
 
-
 std::piecewise_construct_t f() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
-
-int main(int, char**) {
-    return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.U_V.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.U_V.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.const_first_const_second.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.const_first_const_second.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.const_first_const_second_cxx03.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.const_first_const_second_cxx03.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.copy.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.copy.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.copy_move_trivial.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.copy_move_trivial.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default.explicit.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.explicit_LWG2510.verify.cpp
similarity index 96%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default.explicit.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.explicit_LWG2510.verify.cpp
index 2c4106f..50a4eb7 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default.explicit.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.explicit_LWG2510.verify.cpp
@@ -32,7 +32,3 @@
 std::pair<ExplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test2() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
 std::pair<ExplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test3() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
 std::pair<ImplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test4() { return {}; }
-
-int main(int, char**) {
-    return 0;
-}
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.sfinae_LWG2367.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.sfinae_LWG2367.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.move.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.move.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.not_constexpr_cxx11.verify.cpp
similarity index 85%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.not_constexpr_cxx11.verify.cpp
index 88d0f96..e994734 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.not_constexpr_cxx11.verify.cpp
@@ -16,19 +16,18 @@
 #include <cassert>
 
 struct ExplicitT {
-  constexpr explicit ExplicitT(int x) : value(x) {}
-  constexpr explicit ExplicitT(ExplicitT const& o) : value(o.value) {}
-  int value;
+    constexpr explicit ExplicitT(int x) : value(x) {}
+    constexpr explicit ExplicitT(ExplicitT const& o) : value(o.value) {}
+    int value;
 };
 
 struct ImplicitT {
-  constexpr ImplicitT(int x) : value(x) {}
-  constexpr ImplicitT(ImplicitT const& o) : value(o.value) {}
-  int value;
+    constexpr ImplicitT(int x) : value(x) {}
+    constexpr ImplicitT(ImplicitT const& o) : value(o.value) {}
+    int value;
 };
 
-int main(int, char**)
-{
+void f() {
     {
         using P = std::pair<int, int>;
         constexpr int x = 42;
@@ -53,6 +52,4 @@
         constexpr P U_V = {42, 101}; // expected-error {{must be initialized by a constant expression}}
         constexpr P pair_U_V = other; // expected-error {{must be initialized by a constant expression}}
     }
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor_pair_U_V_const_move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_move.pass.cpp
similarity index 99%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor_pair_U_V_const_move.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_move.pass.cpp
index d3fbf6f..63f409b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor_pair_U_V_const_move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_move.pass.cpp
@@ -11,6 +11,7 @@
 // <utility>
 
 // template <class T1, class T2> struct pair
+
 // template <class U1, class U2>
 //   constexpr explicit(see below) pair(const pair<U1, U2>&& p);
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_ref.cxx03.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_ref.cxx03.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_ref.pass.cpp
similarity index 98%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_ref.pass.cpp
index 42ddb4e..3a1e9ad 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_const_ref.pass.cpp
@@ -12,7 +12,8 @@
 
 // template <class T1, class T2> struct pair
 
-// template <class U, class V> EXPLICIT constexpr pair(const pair<U, V>& p);
+// template <class U, class V>
+//  explicit(see-below) constexpr pair(const pair<U, V>& p);
 
 #include <utility>
 #include <cassert>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_move.pass.cpp
similarity index 98%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_move.pass.cpp
index 593df90..3b2d093 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_move.pass.cpp
@@ -12,7 +12,8 @@
 
 // template <class T1, class T2> struct pair
 
-// template <class U, class V> pair(pair<U, V>&& p);
+// template <class U, class V>
+//   constexpr explicit(see below) pair(pair<U, V>&& p);
 
 #include <utility>
 #include <memory>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor_pair_U_V_ref.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_ref.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor_pair_U_V_ref.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.pair_U_V_ref.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.piecewise_construct.pass.cpp
similarity index 100%
rename from third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
rename to third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.piecewise_construct.pass.cpp
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
index 76c1509..76f9771 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
@@ -10,12 +10,12 @@
 
 // template <class T1, class T2> struct pair
 
-// template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
-// template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
-// template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
-// template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
-// template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
-// template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);
+// template <class T1, class T2, class U1, class U2> bool operator==(const pair<T1,T2>&, const pair<U1,U2>&);
+// template <class T1, class T2, class U1, class U2> bool operator!=(const pair<T1,T2>&, const pair<U1,U2>&);
+// template <class T1, class T2, class U1, class U2> bool operator< (const pair<T1,T2>&, const pair<U1,U2>&);
+// template <class T1, class T2, class U1, class U2> bool operator> (const pair<T1,T2>&, const pair<U1,U2>&);
+// template <class T1, class T2, class U1, class U2> bool operator>=(const pair<T1,T2>&, const pair<U1,U2>&);
+// template <class T1, class T2, class U1, class U2> bool operator<=(const pair<T1,T2>&, const pair<U1,U2>&);
 
 #include <utility>
 #include <cassert>
@@ -25,6 +25,18 @@
 int main(int, char**)
 {
     {
+        typedef std::pair<int, short> P1;
+        typedef std::pair<long, long> P2;
+        P1 p1(3, static_cast<short>(4));
+        P2 p2(3, 4);
+        assert( (p1 == p2));
+        assert(!(p1 != p2));
+        assert(!(p1 <  p2));
+        assert( (p1 <= p2));
+        assert(!(p1 >  p2));
+        assert( (p1 >= p2));
+    }
+    {
         typedef std::pair<int, short> P;
         P p1(3, static_cast<short>(4));
         P p2(3, static_cast<short>(4));
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/three_way_comparison.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/three_way_comparison.pass.cpp
index bd93d3f..5aa6efb 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/three_way_comparison.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/pairs/pairs.spec/three_way_comparison.pass.cpp
@@ -10,7 +10,9 @@
 
 // template <class T1, class T2> struct pair
 
-// template <class T1, class T2> bool operator<=>(const pair<T1,T2>&, const pair<T1,T2>&);
+// template <class T1, class T2, class U1, class U2>
+//   constexpr common_comparison_category_t<synth-three-way-result<T1, U1>,synth-three-way-result<T2, U2>>
+//     operator<=>(const pair<T1,T2>&, const pair<U1,U2>&);
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
@@ -19,15 +21,38 @@
 #include <limits>
 #include <type_traits> // std::is_constant_evaluated
 #include <utility>
+#include <string>
 
 #include "test_macros.h"
 
-template<class T> concept HasEqual = requires(T t) { t == t; };
-template<class T> concept HasLess = requires(T t) { t < t; };
-template<class T> concept HasSpaceship = requires(T t) { t <=> t; };
+template <class T>
+concept HasEqual = requires(T t) { t == t; };
+template <class T>
+concept HasLess = requires(T t) { t < t; };
+template <class T, class U = T>
+concept HasSpaceship = requires(T t, U u) { t <=> u; };
 
 constexpr bool test() {
   {
+    // Pairs of different types should compare with strong ordering.
+    using P1 = std::pair<int, int>;
+    using P2 = std::pair<long long, long long>;
+    ASSERT_SAME_TYPE(decltype(P1() <=> P2()), std::strong_ordering);
+    assert((P1(1, 1) <=> P2(1, 2)) == std::strong_ordering::less);
+    assert((P1(2, 1) <=> P2(1, 2)) == std::strong_ordering::greater);
+    assert((P1(0, 0) <=> P2(0, 0)) == std::strong_ordering::equal);
+  }
+  {
+    // Pairs of different types should compare with partial ordering.
+    using P1 = std::pair<int, int>;
+    using P2 = std::pair<double, double>;
+    ASSERT_SAME_TYPE(decltype(P1() <=> P2()), std::partial_ordering);
+    assert((P1(1, 1) <=> P2(1.0, 2.0)) == std::partial_ordering::less);
+    assert((P1(2, 1) <=> P2(1.0, 2.0)) == std::partial_ordering::greater);
+    assert((P1(0, 0) <=> P2(0.0, 0.0)) == std::partial_ordering::equivalent);
+  }
+  { static_assert(!HasSpaceship<std::pair<int, int>, std::pair<std::string, int>>); }
+  {
     // Pairs of types that both have strong ordering should compare with strong ordering.
     using P = std::pair<int, int>;
     ASSERT_SAME_TYPE(decltype(P() <=> P()), std::strong_ordering);
@@ -50,7 +75,7 @@
   }
   {
     // Pairs of int (strongly ordered) and double (partially ordered) should compare with partial ordering.
-    using P = std::pair<int, double>;
+    using P              = std::pair<int, double>;
     constexpr double nan = std::numeric_limits<double>::quiet_NaN();
     ASSERT_SAME_TYPE(decltype(P() <=> P()), std::partial_ordering);
     assert((P(1, 1.0) <=> P(1, 2.0)) == std::partial_ordering::less);
@@ -62,7 +87,7 @@
     assert((P(1, nan) <=> P(1, nan)) == std::partial_ordering::unordered);
   }
   {
-    using P = std::pair<double, int>;
+    using P              = std::pair<double, int>;
     constexpr double nan = std::numeric_limits<double>::quiet_NaN();
     ASSERT_SAME_TYPE(decltype(P() <=> P()), std::partial_ordering);
     assert((P(2.0, 1) <=> P(1.0, 2)) == std::partial_ordering::greater);
@@ -93,12 +118,12 @@
 #endif
   {
     {
-      using P = std::pair<int, double>;
+      using P              = std::pair<int, double>;
       constexpr double nan = std::numeric_limits<double>::quiet_NaN();
       assert((P(1, 2.0) <=> P(1, nan)) == std::partial_ordering::unordered);
     }
     {
-      using P = std::pair<double, int>;
+      using P              = std::pair<double, int>;
       constexpr double nan = std::numeric_limits<double>::quiet_NaN();
       assert((P(1.0, 1) <=> P(nan, 2)) == std::partial_ordering::unordered);
     }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
index 8a1afe2..79a9f5f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
@@ -61,12 +61,12 @@
     {
         using T1 = std::in_place_index_t<0>;
         using T2 = std::in_place_index_t<1>;
-        using T3 = std::in_place_index_t<static_cast<size_t>(-1)>;
+        using T3 = std::in_place_index_t<static_cast<std::size_t>(-1)>;
         static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value);
         static_assert(!std::is_same<T2, T3>::value);
         static_assert(check_tag<T1>(std::in_place_index<0>));
         static_assert(check_tag<T2>(std::in_place_index<1>));
-        static_assert(check_tag<T3>(std::in_place_index<static_cast<size_t>(-1)>));
+        static_assert(check_tag<T3>(std::in_place_index<static_cast<std::size_t>(-1)>));
     }
 
   return 0;
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.intcmp/intcmp.in_range/in_range.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.intcmp/intcmp.in_range/in_range.pass.cpp
index 1efa3d9..847cee2 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.intcmp/intcmp.in_range/in_range.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.intcmp/intcmp.in_range/in_range.pass.cpp
@@ -47,14 +47,14 @@
 }
 
 constexpr void test_in_range() {
-  constexpr Tuple<uint8_t> utup8;
-  constexpr Tuple<int8_t> stup8;
-  assert(!std::in_range<int8_t>(utup8.max));
+  constexpr Tuple<std::uint8_t> utup8;
+  constexpr Tuple<std::int8_t> stup8;
+  assert(!std::in_range<std::int8_t>(utup8.max));
   assert(std::in_range<short>(utup8.max));
-  assert(!std::in_range<uint8_t>(stup8.min));
-  assert(std::in_range<int8_t>(utup8.mid));
-  assert(!std::in_range<uint8_t>(stup8.mid));
-  assert(!std::in_range<uint8_t>(-1));
+  assert(!std::in_range<std::uint8_t>(stup8.min));
+  assert(std::in_range<std::int8_t>(utup8.mid));
+  assert(!std::in_range<std::uint8_t>(stup8.mid));
+  assert(!std::in_range<std::uint8_t>(-1));
 }
 
 template <class... Ts>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.underlying/to_underlying.verify.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.underlying/to_underlying.verify.cpp
index b1b2881..9236d6e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.underlying/to_underlying.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.underlying/to_underlying.verify.cpp
@@ -16,9 +16,7 @@
 
 struct S {};
 
-int main(int, char**) {
+void f() {
   std::to_underlying(125); // expected-error {{no matching function for call}}
   std::to_underlying(S{}); // expected-error {{no matching function for call}}
-
-  return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
index cfb3606..f571c1e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // Make sure that reaching std::unreachable() with assertions enabled triggers an assertion.
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
index 0db55cf..aa9c925 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_variant_access-missing
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
index b18d94f..47aed9a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -234,7 +233,7 @@
 #endif
 }
 
-template <std::size_t I> using Idx = std::integral_constant<size_t, I>;
+template <std::size_t I> using Idx = std::integral_constant<std::size_t, I>;
 
 void test_throws_for_all_value_categories() {
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -245,8 +244,8 @@
   V v1(42l);
   const V &cv1 = v1;
   assert(v1.index() == 1);
-  std::integral_constant<size_t, 0> zero;
-  std::integral_constant<size_t, 1> one;
+  std::integral_constant<std::size_t, 0> zero;
+  std::integral_constant<std::size_t, 1> one;
   auto test = [](auto idx, auto &&v) {
     using Idx = decltype(idx);
     try {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
index dc938d1..734fe1b 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.hash/hash.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.hash/hash.pass.cpp
index 770bbec..f472144 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.hash/hash.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.hash/hash.pass.cpp
@@ -24,7 +24,7 @@
 #ifndef TEST_HAS_NO_EXCEPTIONS
 namespace std {
 template <> struct hash<::MakeEmptyT> {
-  size_t operator()(const ::MakeEmptyT &) const {
+  std::size_t operator()(const ::MakeEmptyT &) const {
     assert(false);
     return 0;
   }
@@ -127,7 +127,7 @@
 
 template <>
 struct hash<B> {
-  size_t operator()(B const&) const {
+  std::size_t operator()(B const&) const {
     return 0;
   }
 };
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
index f5e1e3d..be1a0c9 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
@@ -27,7 +27,7 @@
 #include "test_macros.h"
 #include "variant_test_helpers.h"
 
-template <class V, size_t I, class E> void test() {
+template <class V, std::size_t I, class E> void test() {
   static_assert(
       std::is_same_v<typename std::variant_alternative<I, V>::type, E>, "");
   static_assert(
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
index 8c5b70d..1ee0c32 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
@@ -23,7 +23,7 @@
 
 #include "test_macros.h"
 
-template <class V, size_t E> void test() {
+template <class V, std::size_t E> void test() {
   static_assert(std::variant_size<V>::value == E, "");
   static_assert(std::variant_size<const V>::value == E, "");
   static_assert(std::variant_size<volatile V>::value == E, "");
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
index bc52c9c..7596855 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
index 46ccd44..a0b6684 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -322,7 +321,7 @@
 #endif // TEST_HAS_NO_EXCEPTIONS
 }
 
-template <typename T> struct Result { size_t index; T value; };
+template <typename T> struct Result { std::size_t index; T value; };
 
 void test_copy_assignment_same_index() {
   {
@@ -550,7 +549,7 @@
   }
 }
 
-template <size_t NewIdx, class ValueType>
+template <std::size_t NewIdx, class ValueType>
 constexpr bool test_constexpr_assign_imp(
     std::variant<long, void*, int>&& v, ValueType&& new_value)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
index 775330f..f62b5be 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -291,7 +290,7 @@
 #endif // TEST_HAS_NO_EXCEPTIONS
 }
 
-template <typename T> struct Result { size_t index; T value; };
+template <typename T> struct Result { std::size_t index; T value; };
 
 void test_move_assignment_same_index() {
   {
@@ -464,7 +463,7 @@
   }
 }
 
-template <size_t NewIdx, class ValueType>
+template <std::size_t NewIdx, class ValueType>
 constexpr bool test_constexpr_assign_imp(
     std::variant<long, void*, int>&& v, ValueType&& new_value)
 {
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
index 015c64c..108f92d 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
index b328ba4..3a487c7 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -223,7 +222,7 @@
 #endif // TEST_HAS_NO_EXCEPTIONS
 }
 
-template <size_t Idx>
+template <std::size_t Idx>
 constexpr bool test_constexpr_copy_ctor_imp(std::variant<long, void*, const int> const& v) {
   auto v2 = v;
   return v2.index() == v.index() &&
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
index 17b7242..fd490a3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
index 4e96e59..56d8585 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
index 25eed24..8b4c0cd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
index 2635b5c..dbee67f 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
index 3571505..ea05d90 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
index 1c67f02..308461e 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -161,7 +160,7 @@
 }
 
 template <typename T>
-struct Result { size_t index; T value; };
+struct Result { std::size_t index; T value; };
 
 void test_move_ctor_basic() {
   {
@@ -292,7 +291,7 @@
 #endif // TEST_HAS_NO_EXCEPTIONS
 }
 
-template <size_t Idx>
+template <std::size_t Idx>
 constexpr bool test_constexpr_ctor_imp(std::variant<long, void*, const int> const& v) {
   auto copy = v;
   auto v2 = std::move(copy);
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
index 37a1849..21a02c2 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -28,18 +27,18 @@
 #include "test_macros.h"
 #include "variant_test_helpers.h"
 
-template <class Var, size_t I, class... Args>
+template <class Var, std::size_t I, class... Args>
 constexpr auto test_emplace_exists_imp(int) -> decltype(
     std::declval<Var>().template emplace<I>(std::declval<Args>()...), true) {
   return true;
 }
 
-template <class, size_t, class...>
+template <class, std::size_t, class...>
 constexpr auto test_emplace_exists_imp(long) -> bool {
   return false;
 }
 
-template <class Var, size_t I, class... Args> constexpr bool emplace_exists() {
+template <class Var, std::size_t I, class... Args> constexpr bool emplace_exists() {
   return test_emplace_exists_imp<Var, I, Args...>(0);
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
index 3080678..efbe6bd 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
@@ -39,18 +38,18 @@
       : size(il.size()), value(v) {}
 };
 
-template <class Var, size_t I, class... Args>
+template <class Var, std::size_t I, class... Args>
 constexpr auto test_emplace_exists_imp(int) -> decltype(
     std::declval<Var>().template emplace<I>(std::declval<Args>()...), true) {
   return true;
 }
 
-template <class, size_t, class...>
+template <class, std::size_t, class...>
 constexpr auto test_emplace_exists_imp(long) -> bool {
   return false;
 }
 
-template <class Var, size_t I, class... Args> constexpr bool emplace_exists() {
+template <class Var, std::size_t I, class... Args> constexpr bool emplace_exists() {
   return test_emplace_exists_imp<Var, I, Args...>(0);
 }
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
index eae070e..45c891c 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
index af30e73..9f96166 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
index b61f508..64e65ac 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
index 4a651f3..f4b191a 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class Visitor, class... Variants>
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
index 1e29073..26a44b3 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class Visitor, class... Variants>
@@ -347,7 +346,7 @@
 struct MyVariant : std::variant<short, long, float> {};
 
 namespace std {
-template <size_t Index>
+template <std::size_t Index>
 void get(const MyVariant&) {
   assert(false);
 }
diff --git a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
index 3ae5372..3a848ca 100644
--- a/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class R, class Visitor, class... Variants>
diff --git a/third_party/llvm-project/libcxx/test/support/Counter.h b/third_party/llvm-project/libcxx/test/support/Counter.h
index 8dbdaeb..6a51cc9 100644
--- a/third_party/llvm-project/libcxx/test/support/Counter.h
+++ b/third_party/llvm-project/libcxx/test/support/Counter.h
@@ -25,7 +25,7 @@
     Counter& operator=(const Counter& rhs)          { data_ = rhs.data_; return *this; }
 #if TEST_STD_VER >= 11
     Counter(Counter&& rhs) : data_(std::move(rhs.data_))  { ++gConstructed; }
-    Counter& operator=(Counter&& rhs) { ++gConstructed; data_ = std::move(rhs.data_); return *this; }
+    Counter& operator=(Counter&& rhs) { data_ = std::move(rhs.data_); return *this; }
 #endif
     ~Counter() { --gConstructed; }
 
diff --git a/third_party/llvm-project/libcxx/test/support/MoveOnly.h b/third_party/llvm-project/libcxx/test/support/MoveOnly.h
index 0795cac..4a1c1fc 100644
--- a/third_party/llvm-project/libcxx/test/support/MoveOnly.h
+++ b/third_party/llvm-project/libcxx/test/support/MoveOnly.h
@@ -61,8 +61,8 @@
 struct std::hash<MoveOnly>
 {
     typedef MoveOnly argument_type;
-    typedef size_t result_type;
-    TEST_CONSTEXPR size_t operator()(const MoveOnly& x) const {return static_cast<size_t>(x.get());}
+    typedef std::size_t result_type;
+    TEST_CONSTEXPR std::size_t operator()(const MoveOnly& x) const {return static_cast<size_t>(x.get());}
 };
 
 #endif // MOVEONLY_H
diff --git a/third_party/llvm-project/libcxx/test/support/allocators.h b/third_party/llvm-project/libcxx/test/support/allocators.h
index 0cdaacb..2b987ad 100644
--- a/third_party/llvm-project/libcxx/test/support/allocators.h
+++ b/third_party/llvm-project/libcxx/test/support/allocators.h
@@ -9,6 +9,7 @@
 #ifndef ALLOCATORS_H
 #define ALLOCATORS_H
 
+#include <cstddef>
 #include <memory>
 #include <new>
 #include <type_traits>
diff --git a/third_party/llvm-project/libcxx/test/support/almost_satisfies_types.h b/third_party/llvm-project/libcxx/test/support/almost_satisfies_types.h
index 2a60c22..296dbb6 100644
--- a/third_party/llvm-project/libcxx/test/support/almost_satisfies_types.h
+++ b/third_party/llvm-project/libcxx/test/support/almost_satisfies_types.h
@@ -25,17 +25,22 @@
 static_assert(std::ranges::contiguous_range<UncheckedRange<int*, int*>>);
 
 // almost an input_iterator
-class InputIteratorNotDerivedFrom {
+template <class T>
+class InputIteratorNotDerivedFromGeneric {
 public:
   using difference_type = long;
-  using value_type = int;
+  using value_type = T;
   using iterator_category = void;
 
-  InputIteratorNotDerivedFrom& operator++();
+  InputIteratorNotDerivedFromGeneric& operator++();
   void operator++(int);
-  const int& operator*() const;
+  const T& operator*() const;
 };
 
+using InputIteratorNotDerivedFrom = InputIteratorNotDerivedFromGeneric<int>;
+
+template <class T>
+using InputRangeNotDerivedFromGeneric = UncheckedRange<InputIteratorNotDerivedFromGeneric<T>>;
 using InputRangeNotDerivedFrom = UncheckedRange<InputIteratorNotDerivedFrom>;
 
 static_assert(std::input_or_output_iterator<InputIteratorNotDerivedFrom>);
@@ -58,7 +63,7 @@
 static_assert(std::input_or_output_iterator<InputIteratorNotIndirectlyReadable>);
 static_assert(!std::indirectly_readable<InputIteratorNotIndirectlyReadable>);
 static_assert(!std::input_iterator<InputIteratorNotIndirectlyReadable>);
-static_assert(!std::ranges::input_range<InputIteratorNotIndirectlyReadable>);
+static_assert(!std::ranges::input_range<InputRangeNotIndirectlyReadable>);
 
 class InputIteratorNotInputOrOutputIterator {
 public:
@@ -287,7 +292,7 @@
 static_assert(!std::input_or_output_iterator<OutputIteratorNotInputOrOutputIterator>);
 static_assert(std::indirectly_writable<OutputIteratorNotInputOrOutputIterator, int>);
 static_assert(!std::output_iterator<OutputIteratorNotInputOrOutputIterator, int>);
-static_assert(!std::ranges::input_range<OutputRangeNotInputOrOutputIterator>);
+static_assert(!std::ranges::output_range<OutputRangeNotInputOrOutputIterator, int>);
 
 class OutputIteratorNotIndirectlyWritable {
 public:
@@ -389,6 +394,39 @@
 
 using RandomAccessRangeBadIndex = UncheckedRange<RandomAccessIteratorBadIndex>;
 
+class RandomAccessIteratorBadDifferenceType {
+  using Self = RandomAccessIteratorBadDifferenceType;
+
+public:
+  using value_type = int;
+  // Deliberately use a non-integer `difference_type`
+  using difference_type   = double;
+  using pointer           = double*;
+  using reference         = double&;
+  using iterator_category = std::random_access_iterator_tag;
+
+  reference operator*() const;
+  reference operator[](difference_type) const;
+
+  Self& operator++();
+  Self& operator--();
+  Self operator++(int);
+  Self operator--(int);
+
+  Self& operator+=(difference_type);
+  Self& operator-=(difference_type);
+  friend Self operator+(Self, difference_type);
+  friend Self operator+(difference_type, Self);
+  friend Self operator-(Self, difference_type);
+  friend difference_type operator-(Self, Self);
+
+  auto operator<=>(const Self&) const = default;
+};
+
+static_assert(std::regular<RandomAccessIteratorBadDifferenceType>);
+static_assert(!std::weakly_incrementable<RandomAccessIteratorBadDifferenceType>);
+static_assert(!std::random_access_iterator<RandomAccessIteratorBadDifferenceType>);
+
 template <class Iter>
 class ComparatorNotCopyable {
 public:
diff --git a/third_party/llvm-project/libcxx/test/support/assert_macros.h b/third_party/llvm-project/libcxx/test/support/assert_macros.h
index 5d5d810..bf382e1 100644
--- a/third_party/llvm-project/libcxx/test/support/assert_macros.h
+++ b/third_party/llvm-project/libcxx/test/support/assert_macros.h
@@ -29,78 +29,124 @@
 #include <cstdio>
 #include <cstdlib>
 
-#ifndef TEST_HAS_NO_LOCALIZATION
-#  include <sstream>
-#endif
-
-#if TEST_STD_VER > 17
-
-#  ifndef TEST_HAS_NO_LOCALIZATION
-template <class T>
-concept test_char_streamable = requires(T&& value) { std::stringstream{} << std::forward<T>(value); };
-#  endif
-
-// If possible concatenates message for the assertion function, else returns a
-// default message. Not being able to stream is not considered and error. For
-// example, streaming to std::wcerr doesn't work properly in the CI. Therefore
-// the formatting tests should only stream to std::string_string.
-template <class... Args>
-std::string test_concat_message([[maybe_unused]] Args&&... args) {
-#  ifndef TEST_HAS_NO_LOCALIZATION
-  if constexpr ((test_char_streamable<Args> && ...)) {
-    std::stringstream sstr;
-    ((sstr << std::forward<Args>(args)), ...);
-    return sstr.str();
-  } else
-#  endif
-    return "Message discarded since it can't be streamed to std::cerr.\n";
-}
-
-#endif // TEST_STD_VER > 17
-
-// Logs the error and calls exit.
+// This function prints the given arguments to standard error.
 //
-// It shows a generic assert like message including a custom message. This
-// message should end with a newline.
-[[noreturn]] void test_log_error(const char* condition, const char* file, int line, std::string&& message) {
+// Keeping this as a separate function is important since it provides a single point for
+// downstreams to customize how errors are printed on exotic targets, if needed.
+template <class ...Args>
+void test_eprintf(char const* fmt, Args const& ...args) {
+  std::fprintf(stderr, fmt, args...);
+}
+
+void test_log(const char* condition, const char* file, int line, const char* message) {
   const char* msg = condition ? "Assertion failure: " : "Unconditional failure:";
-  std::fprintf(stderr, "%s%s %s %d\n%s", msg, condition, file, line, message.c_str());
-  exit(EXIT_FAILURE);
+  test_eprintf("%s%s %s %d\n%s", msg, condition, file, line, message);
 }
 
-inline void test_fail(const char* file, int line, std::string&& message) {
-  test_log_error("", file, line, std::move(message));
+template <class F>
+void test_log(const char* condition, const char* file, int line, const F& functor) {
+  test_eprintf("Assertion failure: %s %s %d\n", condition, file, line);
+  functor();
 }
 
-inline void test_require(bool condition, const char* condition_str, const char* file, int line, std::string&& message) {
+template <class Arg>
+[[noreturn]] void test_fail(const char* file, int line, const Arg& arg) {
+  test_log("", file, line, arg);
+  std::abort();
+}
+
+template <class Arg>
+void test_require(bool condition, const char* condition_str, const char* file, int line, const Arg& arg) {
   if (condition)
     return;
 
-  test_log_error(condition_str, file, line, std::move(message));
-}
-
-inline void test_libcpp_require(
-    [[maybe_unused]] bool condition,
-    [[maybe_unused]] const char* condition_str,
-    [[maybe_unused]] const char* file,
-    [[maybe_unused]] int line,
-    [[maybe_unused]] std::string&& message) {
-#if defined(_LIBCPP_VERSION)
-  test_require(condition, condition_str, file, line, std::move(message));
-#endif
+  test_log(condition_str, file, line, arg);
+  std::abort();
 }
 
 // assert(false) replacement
-#define TEST_FAIL(MSG) ::test_fail(__FILE__, __LINE__, MSG)
+// The ARG is either a
+// - c-ctring or std::string, in which case the string is printed to stderr,
+// - an invocable object, which will be invoked.
+#define TEST_FAIL(ARG) ::test_fail(__FILE__, __LINE__, ARG)
 
 // assert replacement.
-#define TEST_REQUIRE(CONDITION, MSG) ::test_require(CONDITION, #CONDITION, __FILE__, __LINE__, MSG)
+// ARG is the same as for TEST_FAIL
+#define TEST_REQUIRE(CONDITION, ARG) ::test_require(CONDITION, #CONDITION, __FILE__, __LINE__, ARG)
 
 // LIBCPP_ASSERT replacement
 //
 // This requirement is only tested when the test suite is used for libc++.
 // This allows checking libc++ specific requirements, for example the error
 // messages of exceptions.
-#define TEST_LIBCPP_REQUIRE(CONDITION, MSG) ::test_libcpp_require(CONDITION, #CONDITION, __FILE__, __LINE__, MSG)
+// ARG is the same as for TEST_FAIL
+#if defined(_LIBCPP_VERSION)
+#  define TEST_LIBCPP_REQUIRE(CONDITION, ARG) ::test_require(CONDITION, #CONDITION, __FILE__, __LINE__, ARG)
+#else
+#  define TEST_LIBCPP_REQUIRE(...) /* DO NOTHING */
+#endif
+
+// Helper macro to test an expression does not throw any exception.
+#ifndef TEST_HAS_NO_EXCEPTIONS
+#  define TEST_DOES_NOT_THROW(EXPR)                                                                                    \
+    do {                                                                                                               \
+      try {                                                                                                            \
+        static_cast<void>(EXPR);                                                                                       \
+      } catch (...) {                                                                                                  \
+        ::test_log(#EXPR, __FILE__, __LINE__, "no exception was expected\n");                                          \
+        ::std::abort();                                                                                                \
+      }                                                                                                                \
+    } while (false) /* */
+
+// Helper macro to test an expression throws an exception of the expected type.
+#  define TEST_THROWS_TYPE(TYPE, EXPR)                                                                                 \
+    do {                                                                                                               \
+      try {                                                                                                            \
+        static_cast<void>(EXPR);                                                                                       \
+        ::test_log(nullptr,                                                                                            \
+                   __FILE__,                                                                                           \
+                   __LINE__,                                                                                           \
+                   "no exception is thrown while an exception of type " #TYPE " was expected\n");                      \
+        ::std::abort();                                                                                                \
+      } catch (const TYPE&) {                                                                                          \
+        /* DO NOTHING */                                                                                               \
+      } catch (...) {                                                                                                  \
+        ::test_log(nullptr,                                                                                            \
+                   __FILE__,                                                                                           \
+                   __LINE__,                                                                                           \
+                   "the type of the exception caught differs from the expected type " #TYPE "\n");                     \
+        ::std::abort();                                                                                                \
+      }                                                                                                                \
+    } while (false) /* */
+
+// Helper macro to test an expression throws an exception of the expected type and satisfies a predicate.
+//
+// In order to log additional information the predicate can use log macros.
+// The exception caught is used as argument to the predicate.
+#  define TEST_VALIDATE_EXCEPTION(TYPE, PRED, EXPR)                                                                    \
+    do {                                                                                                               \
+      try {                                                                                                            \
+        static_cast<void>(EXPR);                                                                                       \
+        ::test_log(nullptr,                                                                                            \
+                   __FILE__,                                                                                           \
+                   __LINE__,                                                                                           \
+                   "no exception is thrown while an exception of type " #TYPE " was expected\n");                      \
+        ::std::abort();                                                                                                \
+      } catch (const TYPE& EXCEPTION) {                                                                                \
+        PRED(EXCEPTION);                                                                                               \
+      } catch (...) {                                                                                                  \
+        ::test_log(nullptr,                                                                                            \
+                   __FILE__,                                                                                           \
+                   __LINE__,                                                                                           \
+                   "the type of the exception caught differs from the expected type " #TYPE "\n");                     \
+        ::std::abort();                                                                                                \
+      }                                                                                                                \
+    } while (false)                    /* */
+
+#else                                  // TEST_HAS_NO_EXCEPTIONS
+#  define TEST_DOES_NOT_THROW(EXPR) static_cast<void>(EXPR);
+#  define TEST_THROWS_TYPE(...)        /* DO NOTHING */
+#  define TEST_VALIDATE_EXCEPTION(...) /* DO NOTHING */
+#endif                                 // TEST_HAS_NO_EXCEPTIONS
 
 #endif // TEST_SUPPORT_ASSERT_MACROS_H
diff --git a/third_party/llvm-project/libcxx/test/support/atomic_helpers.h b/third_party/llvm-project/libcxx/test/support/atomic_helpers.h
index dc38b7b..8add02d 100644
--- a/third_party/llvm-project/libcxx/test/support/atomic_helpers.h
+++ b/third_party/llvm-project/libcxx/test/support/atomic_helpers.h
@@ -10,6 +10,7 @@
 #define ATOMIC_HELPERS_H
 
 #include <cassert>
+#include <cstdint>
 
 #include "test_macros.h"
 
@@ -83,14 +84,14 @@
 #endif
     TestFunctor<char16_t>()();
     TestFunctor<char32_t>()();
-    TestFunctor<int8_t>()();
-    TestFunctor<uint8_t>()();
-    TestFunctor<int16_t>()();
-    TestFunctor<uint16_t>()();
-    TestFunctor<int32_t>()();
-    TestFunctor<uint32_t>()();
-    TestFunctor<int64_t>()();
-    TestFunctor<uint64_t>()();
+    TestFunctor<std::int8_t>()();
+    TestFunctor<std::uint8_t>()();
+    TestFunctor<std::int16_t>()();
+    TestFunctor<std::uint16_t>()();
+    TestFunctor<std::int32_t>()();
+    TestFunctor<std::uint32_t>()();
+    TestFunctor<std::int64_t>()();
+    TestFunctor<std::uint64_t>()();
   }
 };
 
diff --git a/third_party/llvm-project/libcxx/test/support/charconv_test_helpers.h b/third_party/llvm-project/libcxx/test/support/charconv_test_helpers.h
index 1ba95e7..f5fbedb 100644
--- a/third_party/llvm-project/libcxx/test/support/charconv_test_helpers.h
+++ b/third_party/llvm-project/libcxx/test/support/charconv_test_helpers.h
@@ -10,12 +10,15 @@
 #define SUPPORT_CHARCONV_TEST_HELPERS_H
 
 #include <algorithm>
-#include <charconv>
 #include <cassert>
+#include <cerrno>
+#include <charconv>
+#include <cstddef>
 #include <limits>
 #include <numeric>
 #include <string.h>
 #include <stdlib.h>
+#include <type_traits>
 
 #include "test_macros.h"
 
@@ -78,12 +81,12 @@
 template <typename X>
 struct to_chars_test_base
 {
-    template <typename T, size_t N, typename... Ts>
+    template <typename T, std::size_t N, typename... Ts>
     TEST_CONSTEXPR_CXX23 void test(T v, char const (&expect)[N], Ts... args)
     {
         std::to_chars_result r;
 
-        constexpr size_t len = N - 1;
+        constexpr std::size_t len = N - 1;
         static_assert(len > 0, "expected output won't be empty");
 
         if (!fits_in<X>(v))
@@ -110,7 +113,7 @@
         std::iota(buf, buf + sizeof(buf), static_cast<unsigned char>(1));
         r = std::to_chars(buf, buf + sizeof(buf), v, args...);
         assert(r.ec == std::errc{});
-        for (size_t i = r.ptr - buf; i < sizeof(buf); ++i)
+        for (std::size_t i = r.ptr - buf; i < sizeof(buf); ++i)
             assert(static_cast<unsigned char>(buf[i]) == i + 1);
         *r.ptr = '\0';
 
diff --git a/third_party/llvm-project/libcxx/test/support/concat_macros.h b/third_party/llvm-project/libcxx/test/support/concat_macros.h
new file mode 100644
index 0000000..d6396a7
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/support/concat_macros.h
@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_SUPPORT_CONCAT_MACROS_H
+#define TEST_SUPPORT_CONCAT_MACROS_H
+
+#include <cstdio>
+#include <string>
+
+#include "assert_macros.h"
+#include "test_macros.h"
+
+#ifndef TEST_HAS_NO_LOCALIZATION
+#  include <sstream>
+#endif
+
+#if TEST_STD_VER > 17
+
+#  ifndef TEST_HAS_NO_LOCALIZATION
+template <class T>
+concept test_char_streamable = requires(T&& value) { std::stringstream{} << std::forward<T>(value); };
+#  endif
+
+// If possible concatenates message for the assertion function, else returns a
+// default message. Not being able to stream is not considered and error. For
+// example, streaming to std::wcerr doesn't work properly in the CI. Therefore
+// the formatting tests should only stream to std::string.
+//
+// The macro TEST_WRITE_CONCATENATED can be used to evaluate the arguments
+// lazily. This useful when using this function in combination with
+// assert_macros.h.
+template <class... Args>
+std::string test_concat_message([[maybe_unused]] Args&&... args) {
+#  ifndef TEST_HAS_NO_LOCALIZATION
+  if constexpr ((test_char_streamable<Args> && ...)) {
+    std::stringstream sstr;
+    ((sstr << std::forward<Args>(args)), ...);
+    return sstr.str();
+  } else
+#  endif
+    return "Message discarded since it can't be streamed to std::cerr.\n";
+}
+
+// Writes its arguments to stderr, using the test_concat_message helper.
+#  define TEST_WRITE_CONCATENATED(...) [&] { ::test_eprintf("%s", ::test_concat_message(__VA_ARGS__).c_str()); }
+
+#endif // TEST_STD_VER > 17
+
+#endif //  TEST_SUPPORT_CONCAT_MACROS_H
diff --git a/third_party/llvm-project/libcxx/test/support/constexpr_char_traits.h b/third_party/llvm-project/libcxx/test/support/constexpr_char_traits.h
index 56c22fe..75380d5 100644
--- a/third_party/llvm-project/libcxx/test/support/constexpr_char_traits.h
+++ b/third_party/llvm-project/libcxx/test/support/constexpr_char_traits.h
@@ -12,6 +12,7 @@
 
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 
@@ -35,12 +36,12 @@
     static TEST_CONSTEXPR  bool lt(char_type c1, char_type c2) TEST_NOEXCEPT
         {return c1 < c2;}
 
-    static TEST_CONSTEXPR_CXX14 int              compare(const char_type* s1, const char_type* s2, size_t n);
-    static TEST_CONSTEXPR_CXX14 size_t           length(const char_type* s);
-    static TEST_CONSTEXPR_CXX14 const char_type* find(const char_type* s, size_t n, const char_type& a);
-    static TEST_CONSTEXPR_CXX14 char_type*       move(char_type* s1, const char_type* s2, size_t n);
-    static TEST_CONSTEXPR_CXX14 char_type*       copy(char_type* s1, const char_type* s2, size_t n);
-    static TEST_CONSTEXPR_CXX14 char_type*       assign(char_type* s, size_t n, char_type a);
+    static TEST_CONSTEXPR_CXX14 int              compare(const char_type* s1, const char_type* s2, std::size_t n);
+    static TEST_CONSTEXPR_CXX14 std::size_t           length(const char_type* s);
+    static TEST_CONSTEXPR_CXX14 const char_type* find(const char_type* s, std::size_t n, const char_type& a);
+    static TEST_CONSTEXPR_CXX14 char_type*       move(char_type* s1, const char_type* s2, std::size_t n);
+    static TEST_CONSTEXPR_CXX14 char_type*       copy(char_type* s1, const char_type* s2, std::size_t n);
+    static TEST_CONSTEXPR_CXX14 char_type*       assign(char_type* s, std::size_t n, char_type a);
 
     static TEST_CONSTEXPR int_type  not_eof(int_type c) TEST_NOEXCEPT
         {return eq_int_type(c, eof()) ? ~eof() : c;}
@@ -61,7 +62,7 @@
 
 template <class CharT>
 TEST_CONSTEXPR_CXX14 int
-constexpr_char_traits<CharT>::compare(const char_type* s1, const char_type* s2, size_t n)
+constexpr_char_traits<CharT>::compare(const char_type* s1, const char_type* s2, std::size_t n)
 {
     for (; n; --n, ++s1, ++s2)
     {
@@ -74,10 +75,10 @@
 }
 
 template <class CharT>
-TEST_CONSTEXPR_CXX14 size_t
+TEST_CONSTEXPR_CXX14 std::size_t
 constexpr_char_traits<CharT>::length(const char_type* s)
 {
-    size_t len = 0;
+    std::size_t len = 0;
     for (; !eq(*s, char_type(0)); ++s)
         ++len;
     return len;
@@ -85,7 +86,7 @@
 
 template <class CharT>
 TEST_CONSTEXPR_CXX14 const CharT*
-constexpr_char_traits<CharT>::find(const char_type* s, size_t n, const char_type& a)
+constexpr_char_traits<CharT>::find(const char_type* s, std::size_t n, const char_type& a)
 {
     for (; n; --n)
     {
@@ -98,7 +99,7 @@
 
 template <class CharT>
 TEST_CONSTEXPR_CXX14 CharT*
-constexpr_char_traits<CharT>::move(char_type* s1, const char_type* s2, size_t n)
+constexpr_char_traits<CharT>::move(char_type* s1, const char_type* s2, std::size_t n)
 {
     char_type* r = s1;
     if (s1 < s2)
@@ -118,7 +119,7 @@
 
 template <class CharT>
 TEST_CONSTEXPR_CXX14 CharT*
-constexpr_char_traits<CharT>::copy(char_type* s1, const char_type* s2, size_t n)
+constexpr_char_traits<CharT>::copy(char_type* s1, const char_type* s2, std::size_t n)
 {
     if (!TEST_IS_CONSTANT_EVALUATED) // fails in constexpr because we might be comparing unrelated pointers
         assert(s2 < s1 || s2 >= s1+n);
@@ -130,7 +131,7 @@
 
 template <class CharT>
 TEST_CONSTEXPR_CXX14 CharT*
-constexpr_char_traits<CharT>::assign(char_type* s, size_t n, char_type a)
+constexpr_char_traits<CharT>::assign(char_type* s, std::size_t n, char_type a)
 {
     char_type* r = s;
     for (; n; --n, ++s)
diff --git a/third_party/llvm-project/libcxx/test/support/container_test_types.h b/third_party/llvm-project/libcxx/test/support/container_test_types.h
index 96e2e2d..ed26ba5 100644
--- a/third_party/llvm-project/libcxx/test/support/container_test_types.h
+++ b/third_party/llvm-project/libcxx/test/support/container_test_types.h
@@ -86,6 +86,7 @@
  */
 
 #include <cassert>
+#include <cstddef>
 #include <functional>
 #include <new>
 #include <utility>
@@ -428,9 +429,9 @@
   template <int ID>
   struct hash< ::CopyInsertable<ID> > {
     typedef ::CopyInsertable<ID> argument_type;
-    typedef size_t result_type;
+    typedef std::size_t result_type;
 
-    size_t operator()(argument_type const& arg) const {
+    std::size_t operator()(argument_type const& arg) const {
       return arg.data;
     }
   };
diff --git a/third_party/llvm-project/libcxx/test/support/controlled_allocators.h b/third_party/llvm-project/libcxx/test/support/controlled_allocators.h
index 1144ae4..be517d6 100644
--- a/third_party/llvm-project/libcxx/test/support/controlled_allocators.h
+++ b/third_party/llvm-project/libcxx/test/support/controlled_allocators.h
@@ -29,7 +29,7 @@
     // 'AllocController' is a concrete type that instruments and controls the
     // behavior of test allocators.
 
-template <class T, size_t ID = 0>
+template <class T, std::size_t ID = 0>
 class CountingAllocator;
     // 'CountingAllocator' is an basic implementation of the 'Allocator'
     // requirements that use the 'AllocController' interface.
@@ -97,7 +97,7 @@
 
     AllocController() = default;
 
-    void countAlloc(void* p, size_t s, size_t a) {
+    void countAlloc(void* p, std::size_t s, size_t a) {
         ++alive;
         ++alloc_count;
         alive_size += s;
@@ -107,7 +107,7 @@
         last_align = last_alloc_align = a;
     }
 
-    void countDealloc(void* p, size_t s, size_t a) {
+    void countDealloc(void* p, std::size_t s, size_t a) {
         --alive;
         ++dealloc_count;
         alive_size -= s;
@@ -144,35 +144,35 @@
       last_destroy_pointer = nullptr;
     }
 public:
-    bool checkAlloc(void* p, size_t s, size_t a) const {
+    bool checkAlloc(void* p, std::size_t s, size_t a) const {
         return p == last_alloc_pointer &&
                s == last_alloc_size &&
                a == last_alloc_align;
     }
 
-    bool checkAlloc(void* p, size_t s) const {
+    bool checkAlloc(void* p, std::size_t s) const {
         return p == last_alloc_pointer &&
                s == last_alloc_size;
     }
 
-    bool checkAllocAtLeast(void* p, size_t s, size_t a) const {
+    bool checkAllocAtLeast(void* p, std::size_t s, size_t a) const {
         return p == last_alloc_pointer &&
                s <= last_alloc_size &&
                a <= last_alloc_align;
     }
 
-    bool checkAllocAtLeast(void* p, size_t s) const {
+    bool checkAllocAtLeast(void* p, std::size_t s) const {
         return p == last_alloc_pointer &&
                s <= last_alloc_size;
     }
 
-    bool checkDealloc(void* p, size_t s, size_t a) const {
+    bool checkDealloc(void* p, std::size_t s, size_t a) const {
         return p == last_dealloc_pointer &&
                s == last_dealloc_size &&
                a == last_dealloc_align;
     }
 
-    bool checkDealloc(void* p, size_t s) const {
+    bool checkDealloc(void* p, std::size_t s) const {
         return p == last_dealloc_pointer &&
                s == last_dealloc_size;
     }
@@ -222,7 +222,7 @@
   DISALLOW_COPY(AllocController);
 };
 
-template <class T, size_t ID>
+template <class T, std::size_t ID>
 class CountingAllocator
 {
 public:
@@ -282,12 +282,12 @@
     AllocController& getController() const { return *P; }
 
 private:
-    template <class Tp, size_t XID> friend class CountingAllocator;
+    template <class Tp, std::size_t XID> friend class CountingAllocator;
     AllocController *P;
 };
 
 
-template <size_t ID>
+template <std::size_t ID>
 class CountingAllocator<void, ID>
 {
 public:
@@ -325,17 +325,17 @@
     AllocController& getController() const { return *P; }
 
 private:
-    template <class Tp, size_t> friend class CountingAllocator;
+    template <class Tp, std::size_t> friend class CountingAllocator;
     AllocController *P;
 };
 
-template <class T, class U, size_t ID>
+template <class T, class U, std::size_t ID>
 inline bool operator==(CountingAllocator<T, ID> const& x,
                        CountingAllocator<U, ID> const& y) {
     return &x.getController() == &y.getController();
 }
 
-template <class T, class U, size_t ID>
+template <class T, class U, std::size_t ID>
 inline bool operator!=(CountingAllocator<T, ID> const& x,
                        CountingAllocator<U, ID> const& y) {
     return !(x == y);
diff --git a/third_party/llvm-project/libcxx/test/support/counting_predicates.h b/third_party/llvm-project/libcxx/test/support/counting_predicates.h
index ef3c293..7bf58b2 100644
--- a/third_party/llvm-project/libcxx/test/support/counting_predicates.h
+++ b/third_party/llvm-project/libcxx/test/support/counting_predicates.h
@@ -23,12 +23,12 @@
     ~unary_counting_predicate() {}
 
     bool operator () (const Arg &a) const { ++count_; return p_(a); }
-    size_t count() const { return count_; }
+    std::size_t count() const { return count_; }
     void reset() { count_ = 0; }
 
 private:
     Predicate p_;
-    mutable size_t count_;
+    mutable std::size_t count_;
 };
 
 
@@ -43,12 +43,12 @@
     ~binary_counting_predicate() {}
 
     bool operator () (const Arg1 &a1, const Arg2 &a2) const { ++count_; return p_(a1, a2); }
-    size_t count() const { return count_; }
+    std::size_t count() const { return count_; }
     void reset() { count_ = 0; }
 
 private:
     Predicate p_;
-    mutable size_t count_;
+    mutable std::size_t count_;
 };
 
 #if TEST_STD_VER > 14
diff --git a/third_party/llvm-project/libcxx/test/support/deduction_guides_sfinae_checks.h b/third_party/llvm-project/libcxx/test/support/deduction_guides_sfinae_checks.h
index 767ff02..5ada5ac 100644
--- a/third_party/llvm-project/libcxx/test/support/deduction_guides_sfinae_checks.h
+++ b/third_party/llvm-project/libcxx/test/support/deduction_guides_sfinae_checks.h
@@ -9,6 +9,7 @@
 #ifndef TEST_SUPPORT_DEDUCTION_GUIDES_SFINAE_CHECKS_H
 #define TEST_SUPPORT_DEDUCTION_GUIDES_SFINAE_CHECKS_H
 
+#include <cstddef>
 #include <functional>
 #include <initializer_list>
 #include <iterator>
@@ -178,30 +179,30 @@
   // (iter, iter, buckets)
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets)
-  static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t>);
-  LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, size_t>);
+  static_assert(SFINAEs_away<Container, BadIter, BadIter, std::size_t>);
+  LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, std::size_t>);
 
   // (iter, iter, buckets, hash)
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets, hash)
-  static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash>);
+  static_assert(SFINAEs_away<Container, BadIter, BadIter, std::size_t, Hash>);
   LIBCPP_STATIC_ASSERT(
-      SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash>);
+      SFINAEs_away<Container, OutputIter, OutputIter, std::size_t, Hash>);
   // Cannot deduce from (iter, iter, buckets, BAD_hash)
-  static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash>);
+  static_assert(SFINAEs_away<Container, Iter, Iter, std::size_t, BadHash>);
   // Note: (iter, iter, buckets, ALLOC_as_hash) is allowed -- it just calls
   // (iter, iter, buckets, alloc)
 
   // (iter, iter, buckets, hash, pred)
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, pred)
-  static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Pred>);
+  static_assert(SFINAEs_away<Container, BadIter, BadIter, std::size_t, Hash, Pred>);
   LIBCPP_STATIC_ASSERT(
-      SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash, Pred>);
+      SFINAEs_away<Container, OutputIter, OutputIter, std::size_t, Hash, Pred>);
   // Cannot deduce from (iter, iter, buckets, BAD_hash, pred)
-  static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Pred>);
+  static_assert(SFINAEs_away<Container, Iter, Iter, std::size_t, BadHash, Pred>);
   // Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, pred)
-  static_assert(SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Pred>);
+  static_assert(SFINAEs_away<Container, Iter, Iter, std::size_t, AllocAsHash, Pred>);
   // Note: (iter, iter, buckets, hash, ALLOC_as_pred) is allowed -- it just
   // calls (iter, iter, buckets, hash, alloc)
 
@@ -209,28 +210,28 @@
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, pred, alloc)
   static_assert(
-      SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Pred, Alloc>);
+      SFINAEs_away<Container, BadIter, BadIter, std::size_t, Hash, Pred, Alloc>);
   LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter,
-      size_t, Hash, Pred, Alloc>);
+      std::size_t, Hash, Pred, Alloc>);
   // Cannot deduce from (iter, iter, buckets, BAD_hash, pred, alloc)
   static_assert(
-      SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Pred, Alloc>);
+      SFINAEs_away<Container, Iter, Iter, std::size_t, BadHash, Pred, Alloc>);
   // Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, pred, alloc)
   static_assert(
-      SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Pred, Alloc>);
+      SFINAEs_away<Container, Iter, Iter, std::size_t, AllocAsHash, Pred, Alloc>);
   // Cannot deduce from (iter, iter, buckets, hash, ALLOC_as_pred, alloc)
   static_assert(
-      SFINAEs_away<Container, Iter, Iter, size_t, Hash, AllocAsPred, Alloc>);
+      SFINAEs_away<Container, Iter, Iter, std::size_t, Hash, AllocAsPred, Alloc>);
   // Cannot deduce from (iter, iter, buckets, hash, pred, BAD_alloc)
   static_assert(
-      SFINAEs_away<Container, Iter, Iter, size_t, Hash, Pred, BadAlloc>);
+      SFINAEs_away<Container, Iter, Iter, std::size_t, Hash, Pred, BadAlloc>);
 
   // (iter, iter, buckets, alloc)
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets, alloc)
-  static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Alloc>);
+  static_assert(SFINAEs_away<Container, BadIter, BadIter, std::size_t, Alloc>);
   LIBCPP_STATIC_ASSERT(
-      SFINAEs_away<Container, OutputIter, OutputIter, size_t, Alloc>);
+      SFINAEs_away<Container, OutputIter, OutputIter, std::size_t, Alloc>);
   // Note: (iter, iter, buckets, BAD_alloc) is interpreted as (iter, iter,
   // buckets, hash), which is valid because the only requirement for the hash
   // parameter is that it's not integral.
@@ -246,14 +247,14 @@
   // (iter, iter, buckets, hash, alloc)
   //
   // Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, alloc)
-  static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Alloc>);
+  static_assert(SFINAEs_away<Container, BadIter, BadIter, std::size_t, Hash, Alloc>);
   LIBCPP_STATIC_ASSERT(
-      SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash, Alloc>);
+      SFINAEs_away<Container, OutputIter, OutputIter, std::size_t, Hash, Alloc>);
   // Cannot deduce from (iter, iter, buckets, BAD_hash, alloc)
-  static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Alloc>);
+  static_assert(SFINAEs_away<Container, Iter, Iter, std::size_t, BadHash, Alloc>);
   // Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, alloc)
   static_assert(
-      SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Alloc>);
+      SFINAEs_away<Container, Iter, Iter, std::size_t, AllocAsHash, Alloc>);
   // Note: (iter, iter, buckets, hash, BAD_alloc) is interpreted as (iter, iter,
   // buckets, hash, pred), which is valid because there are no requirements for
   // the predicate.
@@ -261,16 +262,16 @@
   // (init_list, buckets, hash)
   //
   // Cannot deduce from (init_list, buckets, BAD_hash)
-  static_assert(SFINAEs_away<Container, InitList, size_t, BadHash>);
+  static_assert(SFINAEs_away<Container, InitList, std::size_t, BadHash>);
   // Note: (init_list, buckets, ALLOC_as_hash) is interpreted as (init_list,
   // buckets, alloc), which is valid.
 
   // (init_list, buckets, hash, pred)
   //
   // Cannot deduce from (init_list, buckets, BAD_hash, pred)
-  static_assert(SFINAEs_away<Container, InitList, size_t, BadHash, Pred>);
+  static_assert(SFINAEs_away<Container, InitList, std::size_t, BadHash, Pred>);
   // Cannot deduce from (init_list, buckets, ALLOC_as_hash, pred)
-  static_assert(SFINAEs_away<Container, InitList, size_t, AllocAsHash, Pred>);
+  static_assert(SFINAEs_away<Container, InitList, std::size_t, AllocAsHash, Pred>);
   // Note: (init_list, buckets, hash, ALLOC_as_pred) is interpreted as
   // (init_list, buckets, hash, alloc), which is valid.
 
@@ -278,16 +279,16 @@
   //
   // Cannot deduce from (init_list, buckets, BAD_hash, pred, alloc)
   static_assert(
-      SFINAEs_away<Container, InitList, size_t, BadHash, Pred, Alloc>);
+      SFINAEs_away<Container, InitList, std::size_t, BadHash, Pred, Alloc>);
   // Cannot deduce from (init_list, buckets, ALLOC_as_hash, pred, alloc)
   static_assert(
-      SFINAEs_away<Container, InitList, size_t, AllocAsHash, Pred, Alloc>);
+      SFINAEs_away<Container, InitList, std::size_t, AllocAsHash, Pred, Alloc>);
   // Cannot deduce from (init_list, buckets, hash, ALLOC_as_pred, alloc)
   static_assert(
-      SFINAEs_away<Container, InitList, size_t, Hash, AllocAsPred, Alloc>);
+      SFINAEs_away<Container, InitList, std::size_t, Hash, AllocAsPred, Alloc>);
   // Cannot deduce from (init_list, buckets, hash, pred, BAD_alloc)
   static_assert(
-      SFINAEs_away<Container, InitList, size_t, Hash, Pred, BadAlloc>);
+      SFINAEs_away<Container, InitList, std::size_t, Hash, Pred, BadAlloc>);
 
   // (init_list, buckets, alloc)
   //
@@ -298,9 +299,9 @@
   // (init_list, buckets, hash, alloc)
   //
   // Cannot deduce from (init_list, buckets, BAD_hash, alloc)
-  static_assert(SFINAEs_away<Container, InitList, size_t, BadHash, Alloc>);
+  static_assert(SFINAEs_away<Container, InitList, std::size_t, BadHash, Alloc>);
   // Cannot deduce from (init_list, buckets, ALLOC_as_hash, alloc)
-  static_assert(SFINAEs_away<Container, InitList, size_t, AllocAsHash, Alloc>);
+  static_assert(SFINAEs_away<Container, InitList, std::size_t, AllocAsHash, Alloc>);
 
   // (init_list, alloc)
   //
diff --git a/third_party/llvm-project/libcxx/test/support/deleter_types.h b/third_party/llvm-project/libcxx/test/support/deleter_types.h
index c568002..2afb9b3 100644
--- a/third_party/llvm-project/libcxx/test/support/deleter_types.h
+++ b/third_party/llvm-project/libcxx/test/support/deleter_types.h
@@ -15,6 +15,7 @@
 #ifndef SUPPORT_DELETER_TYPES_H
 #define SUPPORT_DELETER_TYPES_H
 
+#include <cstddef>
 #include <type_traits>
 #include <utility>
 #include <cassert>
@@ -385,13 +386,13 @@
 
 #if TEST_STD_VER >= 11
 
-template <class T, size_t ID = 0>
+template <class T, std::size_t ID = 0>
 class PointerDeleter {
   PointerDeleter(const PointerDeleter&);
   PointerDeleter& operator=(const PointerDeleter&);
 
 public:
-  typedef min_pointer<T, std::integral_constant<size_t, ID>> pointer;
+  typedef min_pointer<T, std::integral_constant<std::size_t, ID>> pointer;
 
   TEST_CONSTEXPR_CXX23 PointerDeleter()                            = default;
   TEST_CONSTEXPR_CXX23 PointerDeleter(PointerDeleter&&)            = default;
@@ -413,13 +414,13 @@
   PointerDeleter(const PointerDeleter<U, ID>&, typename std::enable_if<!std::is_same<U, T>::value>::type* = 0);
 };
 
-template <class T, size_t ID>
+template <class T, std::size_t ID>
 class PointerDeleter<T[], ID> {
   PointerDeleter(const PointerDeleter&);
   PointerDeleter& operator=(const PointerDeleter&);
 
 public:
-  typedef min_pointer<T, std::integral_constant<size_t, ID> > pointer;
+  typedef min_pointer<T, std::integral_constant<std::size_t, ID> > pointer;
 
   TEST_CONSTEXPR_CXX23 PointerDeleter()                            = default;
   TEST_CONSTEXPR_CXX23 PointerDeleter(PointerDeleter&&)            = default;
diff --git a/third_party/llvm-project/libcxx/test/support/filesystem_test_helper.h b/third_party/llvm-project/libcxx/test/support/filesystem_test_helper.h
index d09b37e..c7a5470 100644
--- a/third_party/llvm-project/libcxx/test/support/filesystem_test_helper.h
+++ b/third_party/llvm-project/libcxx/test/support/filesystem_test_helper.h
@@ -14,16 +14,18 @@
 #endif
 
 #include <cassert>
+#include <cerrno>
 #include <chrono>
 #include <cstdint>
 #include <cstdio> // for printf
 #include <string>
 #include <system_error>
+#include <type_traits>
 #include <vector>
 
+#include "assert_macros.h"
 #include "make_string.h"
 #include "test_macros.h"
-#include "rapid-cxx-test.h"
 #include "format_string.h"
 
 // For creating socket files
@@ -101,7 +103,7 @@
     // N.B. libc might define some of the foo[64] identifiers using macros from
     // foo64 -> foo or vice versa.
 #if defined(_WIN32)
-    using off64_t = int64_t;
+    using off64_t = std::int64_t;
 #elif defined(__MVS__) || defined(__LP64__)
     using off64_t = ::off_t;
 #else
@@ -214,7 +216,7 @@
     // but the caller is not (std::filesystem also uses uintmax_t rather than
     // off_t). On a 32-bit system this allows us to create a file larger than
     // 2GB.
-    std::string create_file(fs::path filename_path, uintmax_t size = 0) {
+    std::string create_file(fs::path filename_path, std::uintmax_t size = 0) {
         std::string filename = sanitize_path(filename_path.string());
 
         if (size >
@@ -335,7 +337,7 @@
         fs::path const cwd = utils::getcwd();
         fs::path const tmp = fs::temp_directory_path();
         std::string base = cwd.filename().string();
-        size_t i = std::hash<std::string>()(cwd.string());
+        std::size_t i = std::hash<std::string>()(cwd.string());
         fs::path p = tmp / (base + "-static_env." + std::to_string(i));
         while (utils::exists(p.string())) {
             p = tmp / (base + "-static_env." + std::to_string(++i));
@@ -672,9 +674,9 @@
         num_paths(2), func_name(fun_name), opt_message(opt_msg) {}
 
   void operator()(fs::filesystem_error const& Err) {
-    TEST_CHECK(ErrorIsImp(Err.code(), {expected_err}));
-    TEST_CHECK(Err.path1() == expected_path1);
-    TEST_CHECK(Err.path2() == expected_path2);
+    assert(ErrorIsImp(Err.code(), {expected_err}));
+    assert(Err.path1() == expected_path1);
+    assert(Err.path2() == expected_path2);
     LIBCPP_ONLY(check_libcxx_string(Err));
   }
 
@@ -703,11 +705,11 @@
                              transform_path(expected_path1).c_str(),
                              transform_path(expected_path2).c_str());
       default:
-        TEST_CHECK(false && "unexpected case");
+        TEST_FAIL("unexpected case");
         return "";
       }
     }();
-    TEST_CHECK(format == Err.what());
+    assert(format == Err.what());
     if (format != Err.what()) {
       fprintf(stderr,
               "filesystem_error::what() does not match expected output:\n");
diff --git a/third_party/llvm-project/libcxx/test/support/format.functions.common.h b/third_party/llvm-project/libcxx/test/support/format.functions.common.h
index 769b1af..e5f6bbb 100644
--- a/third_party/llvm-project/libcxx/test/support/format.functions.common.h
+++ b/third_party/llvm-project/libcxx/test/support/format.functions.common.h
@@ -11,6 +11,8 @@
 // Contains the common part of the formatter tests for different papers.
 
 #include <algorithm>
+#include <cctype>
+#include <cstddef>
 #include <charconv>
 #include <format>
 #include <ranges>
@@ -43,16 +45,22 @@
 using context_t = typename context<T>::type;
 
 // A user-defined type used to test the handle formatter.
-enum class status : uint16_t { foo = 0xAAAA, bar = 0x5555, foobar = 0xAA55 };
+enum class status : std::uint16_t { foo = 0xAAAA, bar = 0x5555, foobar = 0xAA55 };
 
 // The formatter for a user-defined type used to test the handle formatter.
 template <class CharT>
 struct std::formatter<status, CharT> {
-  int type = 0;
+  // During the 2023 Issaquah meeting LEWG made it clear a formatter is
+  // required to call its parse function. LWG3892 Adds the wording for that
+  // requirement. Therefore this formatter is initialized in an invalid state.
+  // A call to parse sets it in a valid state and a call to format validates
+  // the state.
+  int type = -1;
 
   constexpr auto parse(basic_format_parse_context<CharT>& parse_ctx) -> decltype(parse_ctx.begin()) {
     auto begin = parse_ctx.begin();
-    auto end = parse_ctx.end();
+    auto end   = parse_ctx.end();
+    type       = 0;
     if (begin == end)
       return begin;
 
@@ -85,11 +93,14 @@
     const char* begin = names[0];
     const char* end = names[0];
     switch (type) {
+    case -1:
+      throw_format_error("The formatter's parse function has not been called.");
+
     case 0:
       begin = buffer;
       buffer[0] = '0';
       buffer[1] = 'x';
-      end = std::to_chars(&buffer[2], std::end(buffer), static_cast<uint16_t>(s), 16).ptr;
+      end = std::to_chars(&buffer[2], std::end(buffer), static_cast<std::uint16_t>(s), 16).ptr;
       buffer[6] = '\0';
       break;
 
@@ -97,7 +108,7 @@
       begin = buffer;
       buffer[0] = '0';
       buffer[1] = 'X';
-      end = std::to_chars(&buffer[2], std::end(buffer), static_cast<uint16_t>(s), 16).ptr;
+      end = std::to_chars(&buffer[2], std::end(buffer), static_cast<std::uint16_t>(s), 16).ptr;
       std::transform(static_cast<const char*>(&buffer[2]), end, &buffer[2], [](char c) {
         return static_cast<char>(std::toupper(c)); });
       buffer[6] = '\0';
@@ -123,7 +134,7 @@
   }
 
 private:
-  void throw_format_error(const char* s) {
+  void throw_format_error(const char* s) const {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     throw std::format_error(s);
 #else
@@ -133,6 +144,52 @@
   }
 };
 
+struct parse_call_validator {
+  struct parse_function_not_called {};
+
+  friend constexpr auto operator<=>(const parse_call_validator& lhs, const parse_call_validator& rhs) {
+    return &lhs <=> &rhs;
+  }
+};
+
+// The formatter for a user-defined type used to test the handle formatter.
+//
+// Like std::formatter<status, CharT> this formatter validates that parse is
+// called. This formatter is intended to be used when the formatter's parse is
+// called directly and not with format. In that case the format-spec does not
+// require a terminating }. The tests must be written in a fashion where this
+// formatter is always called with an empty format-spec. This requirement
+// allows testing of certain code paths that are never reached by using a
+// well-formed format-string in the format functions.
+template <class CharT>
+struct std::formatter<parse_call_validator, CharT> {
+  bool parse_called{false};
+
+  constexpr auto parse(basic_format_parse_context<CharT>& parse_ctx) -> decltype(parse_ctx.begin()) {
+    auto begin = parse_ctx.begin();
+    auto end   = parse_ctx.end();
+    assert(begin == end);
+    parse_called = true;
+    return begin;
+  }
+
+  auto format(parse_call_validator, auto& ctx) const -> decltype(ctx.out()) {
+    if (!parse_called)
+      throw_error<parse_call_validator::parse_function_not_called>();
+    return ctx.out();
+  }
+
+private:
+  template <class T>
+  [[noreturn]] void throw_error() const {
+#ifndef TEST_HAS_NO_EXCEPTIONS
+    throw T{};
+#else
+    std::abort();
+#endif
+  }
+};
+
 // Creates format string for the invalid types.
 //
 // valid contains a list of types that are valid.
@@ -142,7 +199,7 @@
 // The return value is a collection of basic_strings, instead of
 // basic_string_views since the values are temporaries.
 namespace detail {
-template <class CharT, size_t N>
+template <class CharT, std::size_t N>
 std::basic_string<CharT> get_colons() {
   static std::basic_string<CharT> result(N, CharT(':'));
   return result;
diff --git a/third_party/llvm-project/libcxx/test/support/make_string.h b/third_party/llvm-project/libcxx/test/support/make_string.h
index 728b654..50dd609 100644
--- a/third_party/llvm-project/libcxx/test/support/make_string.h
+++ b/third_party/llvm-project/libcxx/test/support/make_string.h
@@ -47,18 +47,18 @@
 #define MKSTR_LEN(CharT, Str) MKSTR(Str).length((const CharT*)0)
 
 struct MultiStringType {
-  MKSTR_WCHAR_ONLY(const wchar_t* w_; size_t wn_; )
-  MKSTR_CHAR8_ONLY(const char8_t* u8_; size_t u8n_; )
-  MKSTR_CXX11_ONLY(const char16_t* u16_; size_t u16n_; )
-  MKSTR_CXX11_ONLY(const char32_t* u32_; size_t u32n_; )
-  const char* s_; size_t sn_;
+  MKSTR_WCHAR_ONLY(const wchar_t* w_; std::size_t wn_; )
+  MKSTR_CHAR8_ONLY(const char8_t* u8_; std::size_t u8n_; )
+  MKSTR_CXX11_ONLY(const char16_t* u16_; std::size_t u16n_; )
+  MKSTR_CXX11_ONLY(const char32_t* u32_; std::size_t u32n_; )
+  const char* s_; std::size_t sn_;
 
   TEST_CONSTEXPR MultiStringType(
-      MKSTR_WCHAR_ONLY(const wchar_t *w, size_t wn,)
-      MKSTR_CHAR8_ONLY(const char8_t *u8, size_t u8n,)
-      MKSTR_CXX11_ONLY(const char16_t *u16, size_t u16n,)
-      MKSTR_CXX11_ONLY(const char32_t *u32, size_t u32n,)
-      const char *s, size_t sn)
+      MKSTR_WCHAR_ONLY(const wchar_t *w, std::size_t wn,)
+      MKSTR_CHAR8_ONLY(const char8_t *u8, std::size_t u8n,)
+      MKSTR_CXX11_ONLY(const char16_t *u16, std::size_t u16n,)
+      MKSTR_CXX11_ONLY(const char32_t *u32, std::size_t u32n,)
+      const char *s, std::size_t sn)
     : MKSTR_WCHAR_ONLY(w_(w), wn_(wn),)
       MKSTR_CHAR8_ONLY(u8_(u8), u8n_(u8n),)
       MKSTR_CXX11_ONLY(u16_(u16), u16n_(u16n),)
@@ -71,11 +71,11 @@
   MKSTR_CXX11_ONLY(constexpr const char16_t *as_ptr(const char16_t*) const { return u16_; })
   MKSTR_CXX11_ONLY(constexpr const char32_t *as_ptr(const char32_t*) const { return u32_; })
 
-  TEST_CONSTEXPR size_t length(const char*) const { return sn_; }
-  MKSTR_WCHAR_ONLY(TEST_CONSTEXPR size_t length(const wchar_t*) const { return wn_; })
-  MKSTR_CHAR8_ONLY(constexpr size_t length(const char8_t*) const { return u8n_; })
-  MKSTR_CXX11_ONLY(constexpr size_t length(const char16_t*) const { return u16n_; })
-  MKSTR_CXX11_ONLY(constexpr size_t length(const char32_t*) const { return u32n_; })
+  TEST_CONSTEXPR std::size_t length(const char*) const { return sn_; }
+  MKSTR_WCHAR_ONLY(TEST_CONSTEXPR std::size_t length(const wchar_t*) const { return wn_; })
+  MKSTR_CHAR8_ONLY(constexpr std::size_t length(const char8_t*) const { return u8n_; })
+  MKSTR_CXX11_ONLY(constexpr std::size_t length(const char16_t*) const { return u16n_; })
+  MKSTR_CXX11_ONLY(constexpr std::size_t length(const char32_t*) const { return u32n_; })
 
   // These implicit conversions are used by some tests. TODO: maybe eliminate them?
   TEST_CONSTEXPR operator const char*() const { return s_; }
diff --git a/third_party/llvm-project/libcxx/test/support/min_allocator.h b/third_party/llvm-project/libcxx/test/support/min_allocator.h
index f27ac80..1b3727a 100644
--- a/third_party/llvm-project/libcxx/test/support/min_allocator.h
+++ b/third_party/llvm-project/libcxx/test/support/min_allocator.h
@@ -17,6 +17,7 @@
 #include <memory>
 #include <new>
 #include <type_traits>
+#include <cstring>
 
 #include "test_macros.h"
 
@@ -84,12 +85,12 @@
 };
 
 struct malloc_allocator_base {
-    static size_t outstanding_bytes;
-    static size_t alloc_count;
-    static size_t dealloc_count;
+    static std::size_t outstanding_bytes;
+    static std::size_t alloc_count;
+    static std::size_t dealloc_count;
     static bool disable_default_constructor;
 
-    static size_t outstanding_alloc() {
+    static std::size_t outstanding_alloc() {
       assert(alloc_count >= dealloc_count);
       return (alloc_count - dealloc_count);
     }
@@ -122,7 +123,7 @@
 
     T* allocate(std::size_t n)
     {
-        const size_t nbytes = n*sizeof(T);
+        const std::size_t nbytes = n*sizeof(T);
         ++alloc_count;
         outstanding_bytes += nbytes;
         return static_cast<T*>(std::malloc(nbytes));
@@ -130,7 +131,7 @@
 
     void deallocate(T* p, std::size_t n)
     {
-        const size_t nbytes = n*sizeof(T);
+        const std::size_t nbytes = n*sizeof(T);
         ++dealloc_count;
         outstanding_bytes -= nbytes;
         std::free(static_cast<void*>(p));
@@ -193,7 +194,7 @@
 };
 template <class T> bool cpp03_overload_allocator<T>::construct_called = false;
 
-template <class T, class = std::integral_constant<size_t, 0> > class min_pointer;
+template <class T, class = std::integral_constant<std::size_t, 0> > class min_pointer;
 template <class T, class ID> class min_pointer<const T, ID>;
 template <class ID> class min_pointer<void, ID>;
 template <class ID> class min_pointer<const void, ID>;
@@ -432,4 +433,51 @@
     TEST_CONSTEXPR_CXX20 friend bool operator!=(explicit_allocator x, explicit_allocator y) {return !(x == y);}
 };
 
+template <class T>
+class unaligned_allocator {
+public:
+  static_assert(TEST_ALIGNOF(T) == 1, "Type T cannot be created on unaligned address (UB)");
+  typedef T value_type;
+
+  TEST_CONSTEXPR_CXX20 unaligned_allocator() TEST_NOEXCEPT {}
+
+  template <class U>
+  TEST_CONSTEXPR_CXX20 explicit unaligned_allocator(unaligned_allocator<U>) TEST_NOEXCEPT {}
+
+  TEST_CONSTEXPR_CXX20 T* allocate(std::size_t n) { return std::allocator<T>().allocate(n + 1) + 1; }
+
+  TEST_CONSTEXPR_CXX20 void deallocate(T* p, std::size_t n) { std::allocator<T>().deallocate(p - 1, n + 1); }
+
+  TEST_CONSTEXPR_CXX20 friend bool operator==(unaligned_allocator, unaligned_allocator) { return true; }
+  TEST_CONSTEXPR_CXX20 friend bool operator!=(unaligned_allocator x, unaligned_allocator y) { return !(x == y); }
+};
+
+template <class T>
+class safe_allocator {
+public:
+  typedef T value_type;
+
+  TEST_CONSTEXPR_CXX20 safe_allocator() TEST_NOEXCEPT {}
+
+  template <class U>
+  TEST_CONSTEXPR_CXX20 safe_allocator(safe_allocator<U>) TEST_NOEXCEPT {}
+
+  TEST_CONSTEXPR_CXX20 T* allocate(std::size_t n) {
+    T* memory = std::allocator<T>().allocate(n);
+    if (!std::__libcpp_is_constant_evaluated())
+      std::memset(memory, 0, sizeof(T) * n);
+
+    return memory;
+  }
+
+  TEST_CONSTEXPR_CXX20 void deallocate(T* p, std::size_t n) {
+    if (!std::__libcpp_is_constant_evaluated())
+      DoNotOptimize(std::memset(p, 0, sizeof(T) * n));
+    std::allocator<T>().deallocate(p, n);
+  }
+
+  TEST_CONSTEXPR_CXX20 friend bool operator==(safe_allocator, safe_allocator) { return true; }
+  TEST_CONSTEXPR_CXX20 friend bool operator!=(safe_allocator x, safe_allocator y) { return !(x == y); }
+};
+
 #endif // MIN_ALLOCATOR_H
diff --git a/third_party/llvm-project/libcxx/test/support/nasty_containers.h b/third_party/llvm-project/libcxx/test/support/nasty_containers.h
index 0b56a27..18a424b 100644
--- a/third_party/llvm-project/libcxx/test/support/nasty_containers.h
+++ b/third_party/llvm-project/libcxx/test/support/nasty_containers.h
@@ -10,6 +10,7 @@
 #define NASTY_CONTAINERS_H
 
 #include <cassert>
+#include <cstddef>
 #include <vector>
 #include <list>
 
diff --git a/third_party/llvm-project/libcxx/test/support/nasty_string.h b/third_party/llvm-project/libcxx/test/support/nasty_string.h
new file mode 100644
index 0000000..672c3cb
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/support/nasty_string.h
@@ -0,0 +1,185 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_SUPPORT_NASTY_STRING_H
+#define TEST_SUPPORT_NASTY_STRING_H
+
+#include <algorithm>
+#include <cstddef>
+#include <string>
+#include <type_traits>
+
+#include "make_string.h"
+#include "test_macros.h"
+
+// This defines a nasty_string similar to nasty_containers. This string's
+// value_type does operator hijacking, which allows us to ensure that the
+// library uses the provided `CharTraits` instead of using operations on
+// the value_type directly.
+
+
+// When using the code during constant evaluation it relies on
+//   P2647R1 Permitting static constexpr variables in constexpr functions
+// This is a C++23 feature, which is not supported by all compilers yet.
+// * GCC >= 13
+// * Clang >= 16
+// * MSVC no support yet
+//
+// TODO After there is proper compiler support use TEST_STD_VER >= 23 instead
+// of this macro in the tests.
+#if TEST_STD_VER < 23 || __cpp_constexpr < 202211L
+#  define TEST_HAS_NO_NASTY_STRING
+#endif
+
+#ifndef TEST_HAS_NO_NASTY_STRING
+// Make sure the char-like operations in strings do not depend on the char-like type.
+struct nasty_char {
+  template <typename T>
+  friend auto operator<=>(T, T) = delete;
+
+  template <typename T>
+  friend void operator+(T&&) = delete;
+
+  template <typename T>
+  friend void operator-(T&&) = delete;
+
+  template <typename T>
+  friend void operator&(T&&) = delete;
+
+  char c;
+};
+
+static_assert(std::is_trivial<nasty_char>::value, "");
+static_assert(std::is_standard_layout<nasty_char>::value, "");
+
+// These traits are based on the constexpr_traits test class.
+struct nasty_char_traits {
+  typedef nasty_char char_type;
+  typedef int int_type;
+  typedef std::streamoff off_type;
+  typedef std::streampos pos_type;
+  typedef std::mbstate_t state_type;
+  // The comparison_category is omitted so the class will have weak_ordering
+  // in C++20. This is intentional.
+
+  static constexpr void assign(char_type& c1, const char_type& c2) noexcept { c1 = c2; }
+
+  static constexpr bool eq(char_type c1, char_type c2) noexcept { return c1.c == c2.c; }
+
+  static constexpr bool lt(char_type c1, char_type c2) noexcept { return c1.c < c2.c; }
+
+  static constexpr int compare(const char_type* s1, const char_type* s2, std::size_t n);
+  static constexpr std::size_t length(const char_type* s);
+  static constexpr const char_type* find(const char_type* s, std::size_t n, const char_type& a);
+  static constexpr char_type* move(char_type* s1, const char_type* s2, std::size_t n);
+  static constexpr char_type* copy(char_type* s1, const char_type* s2, std::size_t n);
+  static constexpr char_type* assign(char_type* s, std::size_t n, char_type a);
+
+  static constexpr int_type not_eof(int_type c) noexcept { return eq_int_type(c, eof()) ? ~eof() : c; }
+
+  static constexpr char_type to_char_type(int_type c) noexcept { return char_type(c); }
+
+  static constexpr int_type to_int_type(char_type c) noexcept { return int_type(c.c); }
+
+  static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept { return c1 == c2; }
+
+  static constexpr int_type eof() noexcept { return int_type(EOF); }
+};
+
+constexpr int nasty_char_traits::compare(const nasty_char* s1, const nasty_char* s2, std::size_t n) {
+  for (; n; --n, ++s1, ++s2) {
+    if (lt(*s1, *s2))
+      return -1;
+    if (lt(*s2, *s1))
+      return 1;
+  }
+  return 0;
+}
+
+constexpr std::size_t nasty_char_traits::length(const nasty_char* s) {
+  std::size_t len = 0;
+  for (; !eq(*s, nasty_char(0)); ++s)
+    ++len;
+  return len;
+}
+
+constexpr const nasty_char* nasty_char_traits::find(const nasty_char* s, std::size_t n, const nasty_char& a) {
+  for (; n; --n) {
+    if (eq(*s, a))
+      return s;
+    ++s;
+  }
+  return 0;
+}
+
+constexpr nasty_char* nasty_char_traits::move(nasty_char* s1, const nasty_char* s2, std::size_t n) {
+  nasty_char* r = s1;
+  if (s1 < s2) {
+    for (; n; --n, ++s1, ++s2)
+      assign(*s1, *s2);
+  } else if (s2 < s1) {
+    s1 += n;
+    s2 += n;
+    for (; n; --n)
+      assign(*--s1, *--s2);
+  }
+  return r;
+}
+
+constexpr nasty_char* nasty_char_traits::copy(nasty_char* s1, const nasty_char* s2, std::size_t n) {
+  if (!std::is_constant_evaluated()) // fails in constexpr because we might be comparing unrelated pointers
+    assert(s2 < s1 || s2 >= s1 + n);
+  nasty_char* r = s1;
+  for (; n; --n, ++s1, ++s2)
+    assign(*s1, *s2);
+  return r;
+}
+
+constexpr nasty_char* nasty_char_traits::assign(nasty_char* s, std::size_t n, nasty_char a) {
+  nasty_char* r = s;
+  for (; n; --n, ++s)
+    assign(*s, a);
+  return r;
+}
+
+using nasty_string = std::basic_string<nasty_char, nasty_char_traits>;
+
+template <std::size_t N>
+struct ToNastyChar {
+  constexpr ToNastyChar(const char (&r)[N]) {
+    std::transform(r, r + N, std::addressof(text[0]), [](char c) { return nasty_char{c}; });
+  }
+  nasty_char text[N];
+};
+
+template <std::size_t N>
+ToNastyChar(const char (&)[N]) -> ToNastyChar<N>;
+
+template <ToNastyChar t>
+constexpr auto to_nasty_char() {
+  return t;
+}
+
+// A macro like MAKE_CSTRING
+//
+// The difference is this macro can convert the nasty_char too.
+//
+// The lambda is a template, so the 'if constexpr' false branch is not evaluated for the nasty_char.
+#  define CONVERT_TO_CSTRING(CHAR, STR)                                                                                \
+    []<class CharT> {                                                                                                  \
+      if constexpr (std::is_same_v<CharT, nasty_char>) {                                                               \
+        static constexpr auto result = to_nasty_char<STR>();                                                           \
+        return result.text;                                                                                            \
+      } else                                                                                                           \
+        return MAKE_CSTRING(CharT, STR);                                                                               \
+    }.template operator()<CHAR>() /* */
+#else                             // TEST_HAS_NO_NASTY_STRING
+#  define CONVERT_TO_CSTRING(CharT, STR) MAKE_CSTRING(CharT, STR)
+#endif                            // TEST_HAS_NO_NASTY_STRING
+
+#endif                            // TEST_SUPPORT_NASTY_STRING_H
diff --git a/third_party/llvm-project/libcxx/test/support/operator_hijacker.h b/third_party/llvm-project/libcxx/test/support/operator_hijacker.h
index 34be330..a2569da 100644
--- a/third_party/llvm-project/libcxx/test/support/operator_hijacker.h
+++ b/third_party/llvm-project/libcxx/test/support/operator_hijacker.h
@@ -31,9 +31,16 @@
   friend void operator||(T&&, U&&) = delete;
 };
 
+static_assert(std::is_trivially_copyable<operator_hijacker>::value &&     //
+                  std::is_copy_constructible<operator_hijacker>::value && //
+                  std::is_move_constructible<operator_hijacker>::value && //
+                  std::is_copy_assignable<operator_hijacker>::value &&    //
+                  std::is_move_assignable<operator_hijacker>::value,      //
+              "does not satisfy the requirements for atomic<operator_hijacker>");
+
 template <>
 struct std::hash<operator_hijacker> {
-  size_t operator()(const operator_hijacker&) const { return 0; }
+  std::size_t operator()(const operator_hijacker&) const { return 0; }
 };
 
 #endif // SUPPORT_OPERATOR_HIJACKER_H
diff --git a/third_party/llvm-project/libcxx/test/support/platform_support.h b/third_party/llvm-project/libcxx/test/support/platform_support.h
index 88ddf84..ba14b32 100644
--- a/third_party/llvm-project/libcxx/test/support/platform_support.h
+++ b/third_party/llvm-project/libcxx/test/support/platform_support.h
@@ -87,7 +87,7 @@
 inline bool glibc_version_less_than(char const* version) {
   std::string test_version = std::string("glibc ") + version;
 
-  size_t n = confstr(_CS_GNU_LIBC_VERSION, nullptr, (size_t)0);
+  std::size_t n = confstr(_CS_GNU_LIBC_VERSION, nullptr, (size_t)0);
   char *current_version = new char[n];
   confstr(_CS_GNU_LIBC_VERSION, current_version, n);
 
diff --git a/third_party/llvm-project/libcxx/test/support/poisoned_hash_helper.h b/third_party/llvm-project/libcxx/test/support/poisoned_hash_helper.h
index d37f3b3..000b08c 100644
--- a/third_party/llvm-project/libcxx/test/support/poisoned_hash_helper.h
+++ b/third_party/llvm-project/libcxx/test/support/poisoned_hash_helper.h
@@ -11,6 +11,7 @@
 #define SUPPORT_POISONED_HASH_HELPER_H
 
 #include <cassert>
+#include <cstddef>
 #include <type_traits>
 #include <utility>
 
@@ -117,7 +118,7 @@
 
 template <class Hasher, class Key, class Res = decltype(std::declval<Hasher&>()(std::declval<Key>()))>
 constexpr bool can_hash(int) {
-  return std::is_same<Res, size_t>::value;
+  return std::is_same<Res, std::size_t>::value;
 }
 template <class, class>
 constexpr bool can_hash(long) {
diff --git a/third_party/llvm-project/libcxx/test/support/rapid-cxx-test.h b/third_party/llvm-project/libcxx/test/support/rapid-cxx-test.h
deleted file mode 100644
index 0f3dcd8..0000000
--- a/third_party/llvm-project/libcxx/test/support/rapid-cxx-test.h
+++ /dev/null
@@ -1,866 +0,0 @@
-#ifndef RAPID_CXX_TEST_H
-#define RAPID_CXX_TEST_H
-
-# include <cstddef>
-# include <cstdlib>
-# include <cstdio>
-# include <cstring>
-# include <cassert>
-
-#include "test_macros.h"
-
-#if !defined(RAPID_CXX_TEST_NO_SYSTEM_HEADER) || !defined(__GNUC__)
-#pragma GCC system_header
-#endif
-
-# define RAPID_CXX_TEST_PP_CAT(x, y) RAPID_CXX_TEST_PP_CAT_2(x, y)
-# define RAPID_CXX_TEST_PP_CAT_2(x, y) x##y
-
-# define RAPID_CXX_TEST_PP_STR(...) RAPID_CXX_TEST_PP_STR_2(__VA_ARGS__)
-# define RAPID_CXX_TEST_PP_STR_2(...) #__VA_ARGS__
-
-# if defined(__GNUC__)
-#   define TEST_FUNC_NAME() __PRETTY_FUNCTION__
-#   define RAPID_CXX_TEST_UNUSED __attribute__((unused))
-# else
-#   define TEST_FUNC_NAME() __func__
-#   define RAPID_CXX_TEST_UNUSED
-# endif
-
-////////////////////////////////////////////////////////////////////////////////
-//                          TEST_SUITE
-////////////////////////////////////////////////////////////////////////////////
-# define TEST_SUITE(Name)                                           \
-namespace Name                                                      \
-{                                                                   \
-    inline ::rapid_cxx_test::test_suite & get_test_suite()          \
-    {                                                               \
-        static ::rapid_cxx_test::test_suite m_suite(#Name);         \
-        return m_suite;                                             \
-    }                                                               \
-                                                                    \
-    inline int unit_test_main(int, char**)                          \
-    {                                                               \
-        ::rapid_cxx_test::test_runner runner(get_test_suite());     \
-        return runner.run();                                        \
-    }                                                               \
-}                                                                   \
-int main(int argc, char **argv)                                     \
-{                                                                   \
-    return Name::unit_test_main(argc, argv);                        \
-}                                                                   \
-namespace Name                                                      \
-{ /* namespace closed in TEST_SUITE_END */
-#
-
-////////////////////////////////////////////////////////////////////////////////
-//                         TEST_SUITE_END
-////////////////////////////////////////////////////////////////////////////////
-# define TEST_SUITE_END()                                       \
-} /* namespace opened in TEST_SUITE(...) */
-#
-
-////////////////////////////////////////////////////////////////////////////////
-//                          TEST_CASE
-////////////////////////////////////////////////////////////////////////////////
-
-# if !defined(__clang__)
-#
-# define TEST_CASE(Name)                                                                                \
-    void Name();                                                                                        \
-    static void RAPID_CXX_TEST_PP_CAT(Name, _invoker)()                                                 \
-    {                                                                                                   \
-        Name();                                                                                         \
-    }                                                                                                   \
-    static ::rapid_cxx_test::registrar                                                                  \
-    RAPID_CXX_TEST_PP_CAT(rapid_cxx_test_registrar_, Name)(                                         \
-        get_test_suite()                                                                                \
-      , ::rapid_cxx_test::test_case(__FILE__, #Name, __LINE__, & RAPID_CXX_TEST_PP_CAT(Name, _invoker)) \
-      );                                                                                                \
-    void Name()
-#
-# else /* __clang__ */
-#
-# define TEST_CASE(Name)                                                                                \
-    void Name();                                                                                        \
-    static void RAPID_CXX_TEST_PP_CAT(Name, _invoker)()                                                 \
-    {                                                                                                   \
-        Name();                                                                                         \
-    }                                                                                                   \
-    _Pragma("clang diagnostic push")                                                                    \
-    _Pragma("clang diagnostic ignored \"-Wglobal-constructors\"")                                       \
-    static ::rapid_cxx_test::registrar                                                                  \
-    RAPID_CXX_TEST_PP_CAT(rapid_cxx_test_registrar_, Name)(                                         \
-        get_test_suite()                                                                                \
-      , ::rapid_cxx_test::test_case(__FILE__, #Name, __LINE__, & RAPID_CXX_TEST_PP_CAT(Name, _invoker)) \
-      );                                                                                                \
-    _Pragma("clang diagnostic pop")                                                                     \
-    void Name()
-#
-# endif /* !defined(__clang__) */
-
-
-# define TEST_SET_CHECKPOINT() ::rapid_cxx_test::set_checkpoint(__FILE__, TEST_FUNC_NAME(), __LINE__)
-
-#define RAPID_CXX_TEST_OUTCOME()
-
-////////////////////////////////////////////////////////////////////////////////
-//                              TEST_UNSUPPORTED
-////////////////////////////////////////////////////////////////////////////////
-# define TEST_UNSUPPORTED()                                                                 \
-    do {                                                                                    \
-        TEST_SET_CHECKPOINT();                                                              \
-        ::rapid_cxx_test::test_outcome m_f(                                                 \
-          ::rapid_cxx_test::failure_type::unsupported, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-          , "", ""                                                                          \
-        );                                                                                  \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                       \
-        return;                                                                             \
-    } while (false)
-#
-
-
-////////////////////////////////////////////////////////////////////////////////
-//                            BASIC ASSERTIONS
-////////////////////////////////////////////////////////////////////////////////
-# define TEST_WARN(...)                                                                \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_WARN(" #__VA_ARGS__ ")", ""                                        \
-            );                                                                         \
-        if (not (__VA_ARGS__)) {                                                       \
-            m_f.type = ::rapid_cxx_test::failure_type::warn;                           \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-# define TEST_CHECK(...)                                                               \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_CHECK(" #__VA_ARGS__ ")", ""                                       \
-            );                                                                         \
-        if (not (__VA_ARGS__)) {                                                       \
-            m_f.type = ::rapid_cxx_test::failure_type::check;                          \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-# define TEST_REQUIRE(...)                                                             \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_REQUIRE(" #__VA_ARGS__ ")", ""                                     \
-            );                                                                         \
-        if (not (__VA_ARGS__)) {                                                       \
-            m_f.type = ::rapid_cxx_test::failure_type::require;                        \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            return;                                                                    \
-        }                                                                              \
-    } while (false)
-#
-
-# define TEST_ASSERT(...)                                                              \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_ASSERT(" #__VA_ARGS__ ")", ""                                      \
-            );                                                                         \
-        if (not (__VA_ARGS__)) {                                                       \
-            m_f.type = ::rapid_cxx_test::failure_type::assert;                         \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            std::abort();                                                              \
-        }                                                                              \
-    } while (false)
-#
-
-////////////////////////////////////////////////////////////////////////////////
-//                    TEST_CHECK_NO_THROW / TEST_CHECK_THROW
-////////////////////////////////////////////////////////////////////////////////
-#ifndef TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_CHECK_NO_THROW(...)                                                      \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_CHECK_NO_THROW(" #__VA_ARGS__ ")", ""                              \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-        } catch (...) {                                                                \
-            m_f.type = ::rapid_cxx_test::failure_type::check;                          \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-# define TEST_CHECK_THROW(Except, ...)                                                 \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_CHECK_THROW(" #Except "," #__VA_ARGS__ ")", ""                     \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-            m_f.type = ::rapid_cxx_test::failure_type::check;                          \
-        } catch (Except const &) {}                                                    \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-#define TEST_CHECK_THROW_RESULT(Except, Checker, ...)                          \
-  do {                                                                         \
-    TEST_SET_CHECKPOINT();                                                     \
-    ::rapid_cxx_test::test_outcome m_f(::rapid_cxx_test::failure_type::none,   \
-                                       __FILE__, TEST_FUNC_NAME(), __LINE__,   \
-                                       "TEST_CHECK_THROW_RESULT(" #Except      \
-                                       "," #Checker "," #__VA_ARGS__ ")",      \
-                                       "");                                    \
-    try {                                                                      \
-      (static_cast<void>(__VA_ARGS__));                                        \
-      m_f.type = ::rapid_cxx_test::failure_type::check;                        \
-    } catch (Except const& Caught) {                                           \
-      Checker(Caught);                                                         \
-    }                                                                          \
-    ::rapid_cxx_test::get_reporter().report(m_f);                              \
-  } while (false)
-#
-
-#else // TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_CHECK_NO_THROW(...)                                                      \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_CHECK_NO_THROW(" #__VA_ARGS__ ")", ""                              \
-            );                                                                         \
-        (static_cast<void>(__VA_ARGS__));                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-#define TEST_CHECK_THROW(Except, ...) ((void)0)
-#define TEST_CHECK_THROW_RESULT(Except, Checker, ...) ((void)0)
-
-#endif // TEST_HAS_NO_EXCEPTIONS
-
-
-////////////////////////////////////////////////////////////////////////////////
-//                    TEST_REQUIRE_NO_THROW / TEST_REQUIRE_THROWs
-////////////////////////////////////////////////////////////////////////////////
-#ifndef TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_REQUIRE_NO_THROW(...)                                                    \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_REQUIRE_NO_THROW(" #__VA_ARGS__ ")", ""                            \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-        } catch (...) {                                                                \
-            m_f.type = ::rapid_cxx_test::failure_type::require;                        \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            return;                                                                    \
-        }                                                                              \
-    } while (false)
-#
-
-# define TEST_REQUIRE_THROW(Except, ...)                                               \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_REQUIRE_THROW(" #Except "," #__VA_ARGS__ ")", ""                   \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-            m_f.type = ::rapid_cxx_test::failure_type::require;                        \
-        } catch (Except const &) {}                                                    \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            return;                                                                    \
-        }                                                                              \
-    } while (false)
-#
-
-#else // TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_REQUIRE_NO_THROW(...)                                                    \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_REQUIRE_NO_THROW(" #__VA_ARGS__ ")", ""                            \
-            );                                                                         \
-        (static_cast<void>(__VA_ARGS__));                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-#define TEST_REQUIRE_THROW(Except, ...) ((void)0)
-
-#endif // TEST_HAS_NO_EXCEPTIONS
-
-////////////////////////////////////////////////////////////////////////////////
-//                    TEST_ASSERT_NO_THROW / TEST_ASSERT_THROW
-////////////////////////////////////////////////////////////////////////////////
-#ifndef TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_ASSERT_NO_THROW(...)                                                     \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_ASSERT_NO_THROW(" #__VA_ARGS__ ")", ""                             \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-        } catch (...) {                                                                \
-            m_f.type = ::rapid_cxx_test::failure_type::assert;                         \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            std::abort();                                                              \
-        }                                                                              \
-    } while (false)
-#
-
-# define TEST_ASSERT_THROW(Except, ...)                                                \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_ASSERT_THROW(" #Except "," #__VA_ARGS__ ")", ""                    \
-            );                                                                         \
-        try {                                                                          \
-            (static_cast<void>(__VA_ARGS__));                                          \
-            m_f.type = ::rapid_cxx_test::failure_type::assert;                         \
-        } catch (Except const &) {}                                                    \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            std::abort();                                                              \
-        }                                                                              \
-    } while (false)
-#
-
-#else // TEST_HAS_NO_EXCEPTIONS
-
-# define TEST_ASSERT_NO_THROW(...)                                                     \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-            ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__ \
-            , "TEST_ASSERT_NO_THROW(" #__VA_ARGS__ ")", ""                             \
-            );                                                                         \
-        (static_cast<void>(__VA_ARGS__));                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-#define TEST_ASSERT_THROW(Except, ...) ((void)0)
-
-#endif // TEST_HAS_NO_EXCEPTIONS
-
-////////////////////////////////////////////////////////////////////////////////
-//
-////////////////////////////////////////////////////////////////////////////////
-
-# define TEST_WARN_EQUAL_COLLECTIONS(...)                                              \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-          ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__   \
-          , "TEST_WARN_EQUAL_COLLECTIONS(" #__VA_ARGS__ ")", ""                        \
-        );                                                                             \
-        if (not ::rapid_cxx_test::detail::check_equal_collections_impl(__VA_ARGS__)) { \
-            m_f.type = ::rapid_cxx_test::failure_type::warn;                           \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-# define TEST_CHECK_EQUAL_COLLECTIONS(...)                                             \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-          ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__   \
-          , "TEST_CHECK_EQUAL_COLLECTIONS(" #__VA_ARGS__ ")", ""                       \
-        );                                                                             \
-        if (not ::rapid_cxx_test::detail::check_equal_collections_impl(__VA_ARGS__)) { \
-            m_f.type = ::rapid_cxx_test::failure_type::check;                          \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-    } while (false)
-#
-
-# define TEST_REQUIRE_EQUAL_COLLECTIONS(...)                                           \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-          ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__   \
-          , "TEST_REQUIRE_EQUAL_COLLECTIONS(" #__VA_ARGS__ ")", ""                     \
-        );                                                                             \
-        if (not ::rapid_cxx_test::detail::check_equal_collections_impl(__VA_ARGS__)) { \
-            m_f.type = ::rapid_cxx_test::failure_type::require;                        \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-            return;                                                                    \
-        }                                                                              \
-    } while (false)
-#
-
-# define TEST_ASSERT_EQUAL_COLLECTIONS(...)                                            \
-    do {                                                                               \
-        TEST_SET_CHECKPOINT();                                                         \
-        ::rapid_cxx_test::test_outcome m_f(                                            \
-          ::rapid_cxx_test::failure_type::none, __FILE__, TEST_FUNC_NAME(), __LINE__   \
-          , "TEST_ASSERT_EQUAL_COLLECTIONS(" #__VA_ARGS__ ")", ""                      \
-        );                                                                             \
-        if (not ::rapid_cxx_test::detail::check_equal_collections_impl(__VA_ARGS__)) { \
-            m_f.type = ::rapid_cxx_test::failure_type::assert;                         \
-        }                                                                              \
-        ::rapid_cxx_test::get_reporter().report(m_f);                                  \
-        if (m_f.type != ::rapid_cxx_test::failure_type::none) {                        \
-          ::std::abort();                                                              \
-        }                                                                              \
-    } while (false)
-#
-
-namespace rapid_cxx_test
-{
-    typedef void (*invoker_t)();
-
-    ////////////////////////////////////////////////////////////////////////////
-    struct test_case
-    {
-        test_case()
-            : file(""), func(""), line(0), invoke(NULL)
-        {}
-
-        test_case(const char* file1, const char* func1, std::size_t line1,
-                  invoker_t invoke1)
-            : file(file1), func(func1), line(line1), invoke(invoke1)
-        {}
-
-        const char *file;
-        const char *func;
-        std::size_t line;
-        invoker_t invoke;
-    };
-
-    ////////////////////////////////////////////////////////////////////////////
-    struct failure_type
-    {
-        enum enum_type {
-            none,
-            unsupported,
-            warn,
-            check,
-            require,
-            assert,
-            uncaught_exception
-        };
-    };
-
-    typedef failure_type::enum_type failure_type_t;
-
-    ////////////////////////////////////////////////////////////////////////////
-    struct test_outcome
-    {
-        test_outcome()
-            : type(failure_type::none),
-              file(""), func(""), line(0),
-              expression(""), message("")
-        {}
-
-        test_outcome(failure_type_t type1, const char* file1, const char* func1,
-                     std::size_t line1, const char* expression1,
-                     const char* message1)
-            : type(type1), file(file1), func(func1), line(line1),
-              expression(expression1), message(message1)
-        {
-            trim_func_string();
-        }
-
-        failure_type_t type;
-        const char *file;
-        const char *func;
-        std::size_t line;
-        const char *expression;
-        const char *message;
-
-    private:
-        void trim_file_string() {
-            const char* f_start  = file;
-            const char* prev_start = f_start;
-            const char* last_start = f_start;
-            char last;
-            while ((last = *f_start) != '\0') {
-                ++f_start;
-                if (last == '/' && *f_start) {
-                    prev_start = last_start;
-                    last_start = f_start;
-                }
-            }
-            file = prev_start;
-        }
-      void trim_func_string() {
-          const char* void_loc = ::strstr(func, "void ");
-          if (void_loc == func) {
-              func += strlen("void ");
-          }
-          const char* namespace_loc = ::strstr(func, "::");
-          if (namespace_loc) {
-              func = namespace_loc + 2;
-          }
-      }
-    };
-
-    ////////////////////////////////////////////////////////////////////////////
-    struct checkpoint
-    {
-        const char *file;
-        const char *func;
-        std::size_t line;
-    };
-
-    namespace detail
-    {
-        inline checkpoint & global_checkpoint()
-        {
-            static checkpoint cp = {"", "", 0};
-            return cp;
-        }
-    }
-
-    ////////////////////////////////////////////////////////////////////////////
-    inline void set_checkpoint(const char* file, const char* func, std::size_t line)
-    {
-        checkpoint& cp = detail::global_checkpoint();
-        cp.file = file;
-        cp.func = func;
-        cp.line = line;
-    }
-
-    ////////////////////////////////////////////////////////////////////////////
-    inline checkpoint const & get_checkpoint()
-    {
-        return detail::global_checkpoint();
-    }
-
-    ////////////////////////////////////////////////////////////////////////////
-    class test_suite
-    {
-    public:
-        typedef test_case const* iterator;
-        typedef iterator const_iterator;
-
-    public:
-        test_suite(const char *xname)
-          : m_name(xname), m_tests(), m_size(0)
-        {
-            assert(xname);
-        }
-
-    public:
-        const char *name() const { return m_name; }
-
-        std::size_t size() const { return m_size; }
-
-        test_case const & operator[](std::size_t i) const
-        {
-            assert(i < m_size);
-            return m_tests[i];
-        }
-
-        const_iterator begin() const
-        { return m_tests; }
-
-        const_iterator end() const
-        {
-            return m_tests + m_size;
-        }
-
-    public:
-        std::size_t register_test(test_case tc)
-        {
-            static std::size_t test_case_max = sizeof(m_tests) / sizeof(test_case);
-            assert(m_size < test_case_max);
-            m_tests[m_size] = tc;
-            return m_size++;
-        }
-
-    private:
-        test_suite(test_suite const &);
-        test_suite & operator=(test_suite const &);
-
-    private:
-        const char* m_name;
-        // Since fast compile times in a priority, we use simple containers
-        // with hard limits.
-        test_case m_tests[256];
-        std::size_t m_size;
-    };
-
-    ////////////////////////////////////////////////////////////////////////////
-    class registrar
-    {
-    public:
-        registrar(test_suite & st, test_case tc)
-        {
-            st.register_test(tc);
-        }
-    };
-
-    ////////////////////////////////////////////////////////////////////////////
-    class test_reporter
-    {
-    public:
-        test_reporter()
-            : m_testcases(0), m_testcase_failures(0), m_unsupported(0),
-              m_assertions(0), m_warning_failures(0), m_check_failures(0),
-              m_require_failures(0), m_uncaught_exceptions(0), m_failure()
-        {
-        }
-
-        void test_case_begin()
-        {
-            ++m_testcases;
-            clear_failure();
-        }
-
-        void test_case_end()
-        {
-            if (m_failure.type != failure_type::none
-                && m_failure.type !=  failure_type::unsupported) {
-                ++m_testcase_failures;
-            }
-        }
-
-# if defined(__GNUC__)
-#   pragma GCC diagnostic push
-#   pragma GCC diagnostic ignored "-Wswitch-default"
-# endif
-        // Each assertion and failure is reported through this function.
-        void report(test_outcome o)
-        {
-            ++m_assertions;
-            switch (o.type)
-            {
-            case failure_type::none:
-                break;
-            case failure_type::unsupported:
-                ++m_unsupported;
-                m_failure = o;
-                break;
-            case failure_type::warn:
-                ++m_warning_failures;
-                report_error(o);
-                break;
-            case failure_type::check:
-                ++m_check_failures;
-                report_error(o);
-                m_failure = o;
-                break;
-            case failure_type::require:
-                ++m_require_failures;
-                report_error(o);
-                m_failure = o;
-                break;
-            case failure_type::assert:
-                report_error(o);
-                break;
-            case failure_type::uncaught_exception:
-                ++m_uncaught_exceptions;
-                std::fprintf(stderr
-                    , "Test case FAILED with uncaught exception:\n"
-                      "    last checkpoint near %s::%lu %s\n\n"
-                    , o.file, o.line, o.func
-                    );
-                m_failure = o;
-                break;
-            }
-        }
-# if defined(__GNUC__)
-#   pragma GCC diagnostic pop
-# endif
-
-        test_outcome current_failure() const
-        {
-            return m_failure;
-        }
-
-        void clear_failure()
-        {
-            m_failure.type = failure_type::none;
-            m_failure.file = "";
-            m_failure.func = "";
-            m_failure.line = 0;
-            m_failure.expression = "";
-            m_failure.message = "";
-        }
-
-        std::size_t test_case_count() const
-        { return m_testcases; }
-
-        std::size_t test_case_failure_count() const
-        { return m_testcase_failures; }
-
-        std::size_t unsupported_count() const
-        { return m_unsupported; }
-
-        std::size_t assertion_count() const
-        { return m_assertions; }
-
-        std::size_t warning_failure_count() const
-        { return m_warning_failures; }
-
-        std::size_t check_failure_count() const
-        { return m_check_failures; }
-
-        std::size_t require_failure_count() const
-        { return m_require_failures; }
-
-        std::size_t failure_count() const
-        { return m_check_failures + m_require_failures + m_uncaught_exceptions; }
-
-        // Print a summary of what was run and the outcome.
-        void print_summary(const char* suitename) const
-        {
-            FILE* out = failure_count() ? stderr : stdout;
-            std::size_t testcases_run = m_testcases - m_unsupported;
-            std::fprintf(out, "Summary for testsuite %s:\n", suitename);
-            std::fprintf(out, "    %lu of %lu test cases passed.\n", testcases_run - m_testcase_failures, testcases_run);
-            std::fprintf(out, "    %lu of %lu assertions passed.\n", m_assertions - (m_warning_failures + m_check_failures + m_require_failures), m_assertions);
-            std::fprintf(out, "    %lu unsupported test case%s.\n", m_unsupported, (m_unsupported != 1 ? "s" : ""));
-        }
-
-    private:
-        test_reporter(test_reporter const &);
-        test_reporter const & operator=(test_reporter const &);
-
-        void report_error(test_outcome o) const
-        {
-            std::fprintf(stderr, "In %s:%lu Assertion %s failed.\n    in file: %s\n    %s\n"
-                , o.func, o.line, o.expression, o.file,  o.message ? o.message : ""
-              );
-        }
-
-    private:
-        // counts of testcases, failed testcases, and unsupported testcases.
-        std::size_t m_testcases;
-        std::size_t m_testcase_failures;
-        std::size_t m_unsupported;
-
-        // counts of assertions and assertion failures.
-        std::size_t m_assertions;
-        std::size_t m_warning_failures;
-        std::size_t m_check_failures;
-        std::size_t m_require_failures;
-        std::size_t m_uncaught_exceptions;
-
-        // The last failure. This is cleared between testcases.
-        test_outcome m_failure;
-    };
-
-    ////////////////////////////////////////////////////////////////////////////
-    inline test_reporter & get_reporter()
-    {
-        static test_reporter o;
-        return o;
-    }
-
-    ////////////////////////////////////////////////////////////////////////////
-    class test_runner
-    {
-    public:
-        test_runner(test_suite & ts)
-          : m_ts(ts)
-        {}
-
-    public:
-        int run()
-        {
-            // for each testcase
-            for (test_suite::const_iterator b = m_ts.begin(), e = m_ts.end();
-                 b != e; ++b)
-            {
-                test_case const& tc = *b;
-                set_checkpoint(tc.file, tc.func, tc.line);
-                get_reporter().test_case_begin();
-#ifndef TEST_HAS_NO_EXCEPTIONS
-                try {
-#endif
-                    tc.invoke();
-#ifndef TEST_HAS_NO_EXCEPTIONS
-                } catch (...) {
-                    test_outcome o;
-                    o.type = failure_type::uncaught_exception;
-                    o.file = get_checkpoint().file;
-                    o.func = get_checkpoint().func;
-                    o.line = get_checkpoint().line;
-                    o.expression = "";
-                    o.message = "";
-                    get_reporter().report(o);
-                }
-#endif
-                get_reporter().test_case_end();
-            }
-            auto exit_code = get_reporter().failure_count() ? EXIT_FAILURE : EXIT_SUCCESS;
-            if (exit_code == EXIT_FAILURE || get_reporter().unsupported_count())
-              get_reporter().print_summary(m_ts.name());
-            return exit_code;
-        }
-
-    private:
-        test_runner(test_runner const &);
-        test_runner operator=(test_runner const &);
-
-        test_suite & m_ts;
-    };
-
-    namespace detail
-    {
-        template <class Iter1, class Iter2>
-        bool check_equal_collections_impl(
-            Iter1 start1, Iter1 const end1
-          , Iter2 start2, Iter2 const end2
-          )
-        {
-            while (start1 != end1 && start2 != end2) {
-                if (*start1 != *start2) {
-                    return false;
-                }
-                ++start1; ++start2;
-            }
-            return (start1 == end1 && start2 == end2);
-        }
-    }                                                       // namespace detail
-
-}                                                    // namespace rapid_cxx_test
-
-
-# if defined(__GNUC__)
-#   pragma GCC diagnostic pop
-# endif
-
-#endif /* RAPID_CXX_TEST_H */
diff --git a/third_party/llvm-project/libcxx/test/support/test.support/test_check_assertion.pass.cpp b/third_party/llvm-project/libcxx/test/support/test.support/test_check_assertion.pass.cpp
index cd09445..5612bec 100644
--- a/third_party/llvm-project/libcxx/test/support/test.support/test_check_assertion.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/support/test.support/test_check_assertion.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <cassert>
diff --git a/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_exceptions.verify.cpp b/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_exceptions.verify.cpp
index cc156e2..efdf1c0 100644
--- a/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_exceptions.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_exceptions.verify.cpp
@@ -17,7 +17,6 @@
 #  error "TEST_HAS_NO_EXCEPTIONS should be defined"
 #endif
 
-int main(int, char**) {
+void f() {
     try { (void)0; } catch (...) { } // expected-error {{exceptions disabled}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_rtti.verify.cpp b/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_rtti.verify.cpp
index a7f3557..8790c73 100644
--- a/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_rtti.verify.cpp
+++ b/third_party/llvm-project/libcxx/test/support/test.support/test_macros_header.no_rtti.verify.cpp
@@ -20,8 +20,7 @@
 struct A { virtual ~A() { } };
 struct B : A { };
 
-int main(int, char**) {
+void f() {
     A* ptr = new B;
     (void)dynamic_cast<B*>(ptr); // expected-error{{use of dynamic_cast requires -frtti}}
-    return 0;
 }
diff --git a/third_party/llvm-project/libcxx/test/support/test.support/test_poisoned_hash_helper.pass.cpp b/third_party/llvm-project/libcxx/test/support/test.support/test_poisoned_hash_helper.pass.cpp
index f204fc3..8145074 100644
--- a/third_party/llvm-project/libcxx/test/support/test.support/test_poisoned_hash_helper.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/support/test.support/test_poisoned_hash_helper.pass.cpp
@@ -17,7 +17,7 @@
 
 #include "test_macros.h"
 
-template <class T, size_t = sizeof(T)>
+template <class T, std::size_t = sizeof(T)>
 constexpr bool is_complete_imp(int) { return true; }
 template <class> constexpr bool is_complete_imp(long) { return false; }
 template <class T> constexpr bool is_complete() { return is_complete_imp<T>(0); }
diff --git a/third_party/llvm-project/libcxx/test/support/test.support/type_algorithms.pass.cpp b/third_party/llvm-project/libcxx/test/support/test.support/type_algorithms.pass.cpp
index f94487d..cf6144d 100644
--- a/third_party/llvm-project/libcxx/test/support/test.support/type_algorithms.pass.cpp
+++ b/third_party/llvm-project/libcxx/test/support/test.support/type_algorithms.pass.cpp
@@ -14,14 +14,14 @@
 #include "type_algorithms.h"
 
 // concatenate
-static_assert(std::is_same<meta::concatenate_t<meta::type_list<> >, meta::type_list<> >::value, "");
-static_assert(std::is_same<meta::concatenate_t<meta::type_list<int> >, meta::type_list<int> >::value, "");
+static_assert(std::is_same<types::concatenate_t<types::type_list<> >, types::type_list<> >::value, "");
+static_assert(std::is_same<types::concatenate_t<types::type_list<int> >, types::type_list<int> >::value, "");
 static_assert(
-    std::is_same<meta::concatenate_t<meta::type_list<int>, meta::type_list<long> >, meta::type_list<int, long> >::value,
+    std::is_same<types::concatenate_t<types::type_list<int>, types::type_list<long> >, types::type_list<int, long> >::value,
     "");
 static_assert(
-    std::is_same<meta::concatenate_t<meta::type_list<int>, meta::type_list<long>, meta::type_list<long long> >,
-                 meta::type_list<int, long, long long> >::value,
+    std::is_same<types::concatenate_t<types::type_list<int>, types::type_list<long>, types::type_list<long long> >,
+                 types::type_list<int, long, long long> >::value,
     "");
 
 // apply_all
@@ -57,7 +57,7 @@
 
 TEST_CONSTEXPR_CXX20 void test_for_each() {
   bool is_called_array[3] = {};
-  meta::for_each(meta::type_list<NumT<0>, NumT<1>, NumT<2> >(), ApplyAllTest(is_called_array));
+  types::for_each(types::type_list<NumT<0>, NumT<1>, NumT<2> >(), ApplyAllTest(is_called_array));
   assert(std::all_of(is_called_array, is_called_array + 3, Identity()));
 }
 
diff --git a/third_party/llvm-project/libcxx/test/support/test_allocator.h b/third_party/llvm-project/libcxx/test/support/test_allocator.h
index 3b9676e..9330150 100644
--- a/third_party/llvm-project/libcxx/test/support/test_allocator.h
+++ b/third_party/llvm-project/libcxx/test/support/test_allocator.h
@@ -31,6 +31,8 @@
   int throw_after = INT_MAX;
   int count = 0;
   int alloc_count = 0;
+  int construct_count = 0; // the number of times that ::construct was called
+  int destroy_count = 0; // the number of times that ::destroy was called
   int copied = 0;
   int moved = 0;
   int converted = 0;
@@ -40,6 +42,8 @@
     count = 0;
     time_to_throw = 0;
     alloc_count = 0;
+    construct_count = 0;
+    destroy_count = 0;
     throw_after = INT_MAX;
     clear_ctor_counters();
   }
@@ -144,7 +148,7 @@
   TEST_CONSTEXPR pointer address(reference x) const { return &x; }
   TEST_CONSTEXPR const_pointer address(const_reference x) const { return &x; }
 
-  TEST_CONSTEXPR_CXX14 pointer allocate(size_type n, const void* = 0) {
+  TEST_CONSTEXPR_CXX14 pointer allocate(size_type n, const void* = nullptr) {
     assert(data_ != test_alloc_base::destructed_value);
     if (stats_ != nullptr) {
       if (stats_->time_to_throw >= stats_->throw_after)
@@ -166,6 +170,8 @@
 
   template <class U>
   TEST_CONSTEXPR_CXX20 void construct(pointer p, U&& val) {
+    if (stats_ != nullptr)
+      ++stats_->construct_count;
 #if TEST_STD_VER > 17
     std::construct_at(std::to_address(p), std::forward<U>(val));
 #else
@@ -173,7 +179,11 @@
 #endif
   }
 
-  TEST_CONSTEXPR_CXX14 void destroy(pointer p) { p->~T(); }
+  TEST_CONSTEXPR_CXX14 void destroy(pointer p) {
+    if (stats_ != nullptr)
+      ++stats_->destroy_count;
+    p->~T();
+  }
   TEST_CONSTEXPR friend bool operator==(const test_allocator& x, const test_allocator& y) { return x.data_ == y.data_; }
   TEST_CONSTEXPR friend bool operator!=(const test_allocator& x, const test_allocator& y) { return !(x == y); }
 
@@ -181,88 +191,6 @@
   TEST_CONSTEXPR int get_id() const { return id_; }
 };
 
-template <class T>
-class non_default_test_allocator {
-  int data_ = 0;
-  test_allocator_statistics* stats_ = nullptr;
-
-  template <class U>
-  friend class non_default_test_allocator;
-
-public:
-  typedef unsigned size_type;
-  typedef int difference_type;
-  typedef T value_type;
-  typedef value_type* pointer;
-  typedef const value_type* const_pointer;
-  typedef typename std::add_lvalue_reference<value_type>::type reference;
-  typedef typename std::add_lvalue_reference<const value_type>::type const_reference;
-
-  template <class U>
-  struct rebind {
-    typedef non_default_test_allocator<U> other;
-  };
-
-  TEST_CONSTEXPR_CXX14
-  explicit non_default_test_allocator(int i, test_allocator_statistics* stats = nullptr) TEST_NOEXCEPT
-      : data_(i), stats_(stats) {
-    if (stats_ != nullptr) {
-      ++stats_->count;
-    }
-  }
-
-  TEST_CONSTEXPR_CXX14
-  non_default_test_allocator(const non_default_test_allocator& a) TEST_NOEXCEPT : data_(a.data_), stats_(a.stats_) {
-    if (stats_ != nullptr)
-      ++stats_->count;
-  }
-
-  template <class U>
-  TEST_CONSTEXPR_CXX14 non_default_test_allocator(const non_default_test_allocator<U>& a) TEST_NOEXCEPT
-      : data_(a.data_), stats_(a.stats_) {
-    if (stats_ != nullptr)
-      ++stats_->count;
-  }
-
-  TEST_CONSTEXPR_CXX20 ~non_default_test_allocator() TEST_NOEXCEPT {
-    assert(data_ != test_alloc_base::destructed_value);
-    if (stats_ != nullptr)
-      --stats_->count;
-    data_ = test_alloc_base::destructed_value;
-  }
-
-  TEST_CONSTEXPR pointer address(reference x) const { return &x; }
-  TEST_CONSTEXPR const_pointer address(const_reference x) const { return &x; }
-
-  TEST_CONSTEXPR_CXX20 pointer allocate(size_type n, const void* = nullptr) {
-    assert(data_ != test_alloc_base::destructed_value);
-    if (stats_ != nullptr) {
-      if (stats_->time_to_throw >= stats_->throw_after)
-        TEST_THROW(std::bad_alloc());
-      ++stats_->time_to_throw;
-      ++stats_->alloc_count;
-    }
-    return std::allocator<value_type>().allocate(n);
-  }
-
-  TEST_CONSTEXPR_CXX20 void deallocate(pointer p, size_type n) {
-    assert(data_ != test_alloc_base::destructed_value);
-    if (stats_ != nullptr)
-      --stats_->alloc_count;
-    std::allocator<value_type>().deallocate(p, n);
-  }
-
-  TEST_CONSTEXPR size_type max_size() const TEST_NOEXCEPT { return UINT_MAX / sizeof(T); }
-
-  TEST_CONSTEXPR friend bool operator==(const non_default_test_allocator& x, const non_default_test_allocator& y) {
-    return x.data_ == y.data_;
-  }
-
-  TEST_CONSTEXPR friend bool operator!=(const non_default_test_allocator& x, const non_default_test_allocator& y) {
-    return !(x == y);
-  }
-};
-
 template <>
 class test_allocator<void> {
   int data_ = 0;
@@ -477,7 +405,7 @@
   struct control_block {
     template <class... Args>
     TEST_CONSTEXPR control_block(Args... args) : content(std::forward<Args>(args)...) {}
-    size_t ref_count = 1;
+    std::size_t ref_count = 1;
     T content;
   };
 
diff --git a/third_party/llvm-project/libcxx/test/support/test_comparisons.h b/third_party/llvm-project/libcxx/test/support/test_comparisons.h
index 8187a7c..c54e877 100644
--- a/third_party/llvm-project/libcxx/test/support/test_comparisons.h
+++ b/third_party/llvm-project/libcxx/test/support/test_comparisons.h
@@ -24,7 +24,9 @@
 #define TEST_COMPARISONS_H
 
 #include <cassert>
+#include <compare>
 #include <concepts>
+#include <limits>
 #include <type_traits>
 #include <utility>
 
@@ -238,4 +240,33 @@
     return lhs.value == rhs.value;
   }
 };
+
+#if TEST_STD_VER > 17
+struct StrongOrder {
+  int value;
+  constexpr StrongOrder(int v) : value(v) {}
+  friend std::strong_ordering operator<=>(StrongOrder, StrongOrder) = default;
+};
+
+struct WeakOrder {
+  int value;
+  constexpr WeakOrder(int v) : value(v) {}
+  friend std::weak_ordering operator<=>(WeakOrder, WeakOrder) = default;
+};
+
+struct PartialOrder {
+  int value;
+  constexpr PartialOrder(int v) : value(v) {}
+  friend constexpr std::partial_ordering operator<=>(PartialOrder lhs, PartialOrder rhs) {
+    if (lhs.value == std::numeric_limits<int>::min() || rhs.value == std::numeric_limits<int>::min())
+      return std::partial_ordering::unordered;
+    return lhs.value <=> rhs.value;
+  }
+  friend constexpr bool operator==(PartialOrder lhs, PartialOrder rhs) {
+    return (lhs <=> rhs) == std::partial_ordering::equivalent;
+  }
+};
+
+#endif
+
 #endif // TEST_COMPARISONS_H
diff --git a/third_party/llvm-project/libcxx/test/support/test_constexpr_container.h b/third_party/llvm-project/libcxx/test/support/test_constexpr_container.h
index 092f8b6..ca553be 100644
--- a/third_party/llvm-project/libcxx/test/support/test_constexpr_container.h
+++ b/third_party/llvm-project/libcxx/test/support/test_constexpr_container.h
@@ -14,6 +14,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cstddef>
 #include <utility>
 
 #include "test_macros.h"
@@ -34,7 +35,7 @@
     constexpr iterator end() { return data_ + size_; }
     constexpr const_iterator begin() const { return data_; }
     constexpr const_iterator end() const { return data_ + size_; }
-    constexpr size_t size() const { return size_; }
+    constexpr std::size_t size() const { return size_; }
     constexpr const T& front() const { assert(size_ >= 1); return data_[0]; }
     constexpr const T& back() const { assert(size_ >= 1); return data_[size_-1]; }
 
diff --git a/third_party/llvm-project/libcxx/test/support/test_container_comparisons.h b/third_party/llvm-project/libcxx/test/support/test_container_comparisons.h
new file mode 100644
index 0000000..561275c
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/support/test_container_comparisons.h
@@ -0,0 +1,208 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//  Utility functions to test comparisons on containers.
+
+#ifndef TEST_CONTAINER_COMPARISONS
+#define TEST_CONTAINER_COMPARISONS
+
+#include "test_comparisons.h"
+
+// Implementation detail of `test_sequence_container_spaceship`
+template <template <typename...> typename Container, typename Elem, typename Order>
+constexpr void test_sequence_container_spaceship_with_type() {
+  // Empty containers
+  {
+    Container<Elem> l1;
+    Container<Elem> l2;
+    assert(testOrder(l1, l2, Order::equivalent));
+  }
+  // Identical contents
+  {
+    Container<Elem> l1{1, 1};
+    Container<Elem> l2{1, 1};
+    assert(testOrder(l1, l2, Order::equivalent));
+  }
+  // Less, due to contained values
+  {
+    Container<Elem> l1{1, 1};
+    Container<Elem> l2{1, 2};
+    assert(testOrder(l1, l2, Order::less));
+  }
+  // Greater, due to contained values
+  {
+    Container<Elem> l1{1, 3};
+    Container<Elem> l2{1, 2};
+    assert(testOrder(l1, l2, Order::greater));
+  }
+  // Shorter list
+  {
+    Container<Elem> l1{1};
+    Container<Elem> l2{1, 2};
+    assert(testOrder(l1, l2, Order::less));
+  }
+  // Longer list
+  {
+    Container<Elem> l1{1, 2};
+    Container<Elem> l2{1};
+    assert(testOrder(l1, l2, Order::greater));
+  }
+  // Unordered
+  if constexpr (std::is_same_v<Elem, PartialOrder>) {
+    Container<Elem> l1{1, std::numeric_limits<int>::min()};
+    Container<Elem> l2{1, 2};
+    assert(testOrder(l1, l2, Order::unordered));
+  }
+}
+
+// Tests the `operator<=>` on sequence containers
+template <template <typename...> typename Container>
+constexpr bool test_sequence_container_spaceship() {
+  // The container should fulfil `std::three_way_comparable`
+  static_assert(std::three_way_comparable<Container<int>>);
+
+  // Test different comparison categories
+  test_sequence_container_spaceship_with_type<Container, int, std::strong_ordering>();
+  test_sequence_container_spaceship_with_type<Container, StrongOrder, std::strong_ordering>();
+  test_sequence_container_spaceship_with_type<Container, WeakOrder, std::weak_ordering>();
+  test_sequence_container_spaceship_with_type<Container, PartialOrder, std::partial_ordering>();
+
+  // `LessAndEqComp` does not have `operator<=>`. ordering is sythesized based on `operator<`
+  test_sequence_container_spaceship_with_type<Container, LessAndEqComp, std::weak_ordering>();
+
+  // Thanks to SFINAE, the following is not a compiler error but returns `false`
+  struct NonComparable {};
+  static_assert(!std::three_way_comparable<Container<NonComparable>>);
+
+  return true;
+}
+
+// Implementation detail of `test_ordered_map_container_spaceship`
+template <template <typename...> typename Container, typename Key, typename Val, typename Order>
+constexpr void test_ordered_map_container_spaceship_with_type() {
+  // Empty containers
+  {
+    Container<Key, Val> l1;
+    Container<Key, Val> l2;
+    assert(testOrder(l1, l2, Order::equivalent));
+  }
+  // Identical contents
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 1}};
+    Container<Key, Val> l2{{1, 1}, {2, 1}};
+    assert(testOrder(l1, l2, Order::equivalent));
+  }
+  // Less, due to contained values
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 1}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::less));
+  }
+  // Greater, due to contained values
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 3}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::greater));
+  }
+  // Shorter list
+  {
+    Container<Key, Val> l1{{1, 1}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::less));
+  }
+  // Longer list
+  {
+    Container<Key, Val> l1{{1, 2}, {2, 2}};
+    Container<Key, Val> l2{{1, 1}};
+    assert(testOrder(l1, l2, Order::greater));
+  }
+  // Unordered
+  if constexpr (std::is_same_v<Val, PartialOrder>) {
+    Container<Key, Val> l1{{1, 1}, {2, std::numeric_limits<int>::min()}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::unordered));
+  }
+
+  // Identical contents
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 1}, {2, 2}};
+    Container<Key, Val> l2{{1, 1}, {2, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::equivalent));
+    Container<Key, Val> l3{{1, 1}, {2, 1}, {2, 2}};
+    Container<Key, Val> l4{{2, 1}, {2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::equivalent));
+  }
+  // Less, due to contained values
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 1}, {2, 1}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}, {2, 2}};
+    assert(testOrder(l1, l2, Order::less));
+    Container<Key, Val> l3{{1, 1}, {2, 1}, {2, 1}};
+    Container<Key, Val> l4{{2, 2}, {2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::less));
+  }
+  // Greater, due to contained values
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 3}, {2, 3}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}, {2, 2}};
+    assert(testOrder(l1, l2, Order::greater));
+    Container<Key, Val> l3{{1, 1}, {2, 3}, {2, 3}};
+    Container<Key, Val> l4{{2, 2}, {2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::greater));
+  }
+  // Shorter list
+  {
+    Container<Key, Val> l1{{1, 1}, {2, 2}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}, {2, 2}, {3, 1}};
+    assert(testOrder(l1, l2, Order::less));
+    Container<Key, Val> l3{{1, 1}, {2, 2}};
+    Container<Key, Val> l4{{3, 1}, {2, 2}, {2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::less));
+  }
+  // Longer list
+  {
+    Container<Key, Val> l1{{1, 2}, {2, 2}, {2, 2}, {3, 1}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}};
+    assert(testOrder(l1, l2, Order::greater));
+    Container<Key, Val> l3{{1, 2}, {2, 2}, {2, 2}, {3, 1}};
+    Container<Key, Val> l4{{2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::greater));
+  }
+  // Unordered
+  if constexpr (std::is_same_v<Val, PartialOrder>) {
+    Container<Key, Val> l1{{1, 1}, {2, std::numeric_limits<int>::min()}, {2, 3}};
+    Container<Key, Val> l2{{1, 1}, {2, 2}, {2, 3}};
+    assert(testOrder(l1, l2, Order::unordered));
+    Container<Key, Val> l3{{1, 1}, {2, std::numeric_limits<int>::min()}, {2, 3}};
+    Container<Key, Val> l4{{2, 3}, {2, 2}, {1, 1}};
+    assert(testOrder(l3, l4, Order::unordered));
+  }
+}
+
+// Tests the `operator<=>` on ordered containers
+template <template <typename...> typename Container>
+constexpr bool test_ordered_map_container_spaceship() {
+  // The container should fulfil `std::three_way_comparable`
+  static_assert(std::three_way_comparable<Container<int, int>>);
+
+  // Test different comparison categories
+  test_ordered_map_container_spaceship_with_type<Container, int, int, std::strong_ordering>();
+  test_ordered_map_container_spaceship_with_type<Container, int, StrongOrder, std::strong_ordering>();
+  test_ordered_map_container_spaceship_with_type<Container, int, WeakOrder, std::weak_ordering>();
+  test_ordered_map_container_spaceship_with_type<Container, int, PartialOrder, std::partial_ordering>();
+
+  // `LessAndEqComp` does not have `operator<=>`. ordering is sythesized based on `operator<`
+  test_ordered_map_container_spaceship_with_type<Container, int, LessAndEqComp, std::weak_ordering>();
+
+  // Thanks to SFINAE, the following is not a compiler error but returns `false`
+  struct NonComparable {};
+  static_assert(!std::three_way_comparable<Container<int, NonComparable>>);
+
+  return true;
+}
+
+#endif
diff --git a/third_party/llvm-project/libcxx/test/support/test_iterators.h b/third_party/llvm-project/libcxx/test/support/test_iterators.h
index 588a24f..f0e19fc 100644
--- a/third_party/llvm-project/libcxx/test/support/test_iterators.h
+++ b/third_party/llvm-project/libcxx/test/support/test_iterators.h
@@ -455,7 +455,7 @@
 template <typename T>
 struct ThrowingIterator {
     typedef std::bidirectional_iterator_tag iterator_category;
-    typedef ptrdiff_t                       difference_type;
+    typedef std::ptrdiff_t                       difference_type;
     typedef const T                         value_type;
     typedef const T *                       pointer;
     typedef const T &                       reference;
@@ -566,7 +566,7 @@
 template <typename T>
 struct NonThrowingIterator {
     typedef std::bidirectional_iterator_tag iterator_category;
-    typedef ptrdiff_t                       difference_type;
+    typedef std::ptrdiff_t                       difference_type;
     typedef const T                         value_type;
     typedef const T *                       pointer;
     typedef const T &                       reference;
@@ -916,7 +916,7 @@
  public:
   using value_type = int;
   using reference = int&;
-  using difference_type = ptrdiff_t;
+  using difference_type = std::ptrdiff_t;
 
  private:
   value_type* ptr_ = nullptr;
@@ -1418,23 +1418,33 @@
   requires std::ranges::viewable_range<R&&>
 ProxyRange(R&&) -> ProxyRange<std::views::all_t<R&&>>;
 
-namespace meta {
+#endif // TEST_STD_VER > 17
+
+namespace types {
 template <class Ptr>
-using random_access_iterator_list = type_list<Ptr, contiguous_iterator<Ptr>, random_access_iterator<Ptr>>;
+using random_access_iterator_list =
+    type_list<Ptr,
+#if TEST_STD_VER >= 20
+              contiguous_iterator<Ptr>,
+#endif
+              random_access_iterator<Ptr> >;
 
 template <class Ptr>
 using bidirectional_iterator_list =
-    concatenate_t<random_access_iterator_list<Ptr>, type_list<bidirectional_iterator<Ptr>>>;
+    concatenate_t<random_access_iterator_list<Ptr>, type_list<bidirectional_iterator<Ptr> > >;
 
 template <class Ptr>
-using forward_iterator_list = concatenate_t<bidirectional_iterator_list<Ptr>, type_list<forward_iterator<Ptr>>>;
+using forward_iterator_list = concatenate_t<bidirectional_iterator_list<Ptr>, type_list<forward_iterator<Ptr> > >;
 
 template <class Ptr>
+using cpp17_input_iterator_list = concatenate_t<forward_iterator_list<Ptr>, type_list<cpp17_input_iterator<Ptr> > >;
+
+#if TEST_STD_VER >= 20
+template <class Ptr>
 using cpp20_input_iterator_list =
     concatenate_t<forward_iterator_list<Ptr>, type_list<cpp20_input_iterator<Ptr>, cpp17_input_iterator<Ptr>>>;
+#endif
+} // namespace types
 
-} // namespace meta
-
-#endif // TEST_STD_VER > 17
 
 #endif // SUPPORT_TEST_ITERATORS_H
diff --git a/third_party/llvm-project/libcxx/test/support/test_macros.h b/third_party/llvm-project/libcxx/test/support/test_macros.h
index 573c8d8..210bbf0 100644
--- a/third_party/llvm-project/libcxx/test/support/test_macros.h
+++ b/third_party/llvm-project/libcxx/test/support/test_macros.h
@@ -78,7 +78,8 @@
 #endif
 
 #if defined(__apple_build_version__)
-#define TEST_APPLE_CLANG_VER (__clang_major__ * 100) + __clang_minor__
+// Given AppleClang XX.Y.Z, TEST_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
+#define TEST_APPLE_CLANG_VER (__apple_build_version__ / 10000)
 #elif defined(__clang_major__)
 #define TEST_CLANG_VER (__clang_major__ * 100) + __clang_minor__
 #elif defined(__GNUC__)
diff --git a/third_party/llvm-project/libcxx/test/support/test_memory_resource.h b/third_party/llvm-project/libcxx/test/support/test_memory_resource.h
index 1a0d722..280cdae 100644
--- a/third_party/llvm-project/libcxx/test/support/test_memory_resource.h
+++ b/third_party/llvm-project/libcxx/test/support/test_memory_resource.h
@@ -113,8 +113,8 @@
 
 struct NullProvider {
     NullProvider() {}
-    void* allocate(size_t, size_t) { return nullptr; }
-    void deallocate(void*, size_t, size_t) {}
+    void* allocate(std::size_t, size_t) { return nullptr; }
+    void deallocate(void*, std::size_t, size_t) {}
     void reset() {}
 private:
     DISALLOW_COPY(NullProvider);
@@ -122,22 +122,22 @@
 
 struct NewDeleteProvider {
     NewDeleteProvider() {}
-    void* allocate(size_t s, size_t) { return ::operator new(s); }
-    void deallocate(void* p, size_t, size_t) { ::operator delete(p); }
+    void* allocate(std::size_t s, size_t) { return ::operator new(s); }
+    void deallocate(void* p, std::size_t, size_t) { ::operator delete(p); }
     void reset() {}
 private:
     DISALLOW_COPY(NewDeleteProvider);
 };
 
-template <size_t Size = 4096 * 10> // 10 pages worth of memory.
+template <std::size_t Size = 4096 * 10> // 10 pages worth of memory.
 struct BufferProvider {
     char buffer[Size];
     void* next = &buffer;
-    size_t space = Size;
+    std::size_t space = Size;
 
     BufferProvider() {}
 
-    void* allocate(size_t s, size_t a) {
+    void* allocate(std::size_t s, size_t a) {
         void* ret = std::align(s, a, next, space);
         if (ret == nullptr) {
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -150,7 +150,7 @@
         return ret;
     }
 
-    void deallocate(void*, size_t, size_t) {}
+    void deallocate(void*, std::size_t, size_t) {}
 
     void reset() {
         next = &buffer;
diff --git a/third_party/llvm-project/libcxx/test/support/test_std_memory_resource.h b/third_party/llvm-project/libcxx/test/support/test_std_memory_resource.h
index b372c27..f3923ae 100644
--- a/third_party/llvm-project/libcxx/test/support/test_std_memory_resource.h
+++ b/third_party/llvm-project/libcxx/test/support/test_std_memory_resource.h
@@ -105,14 +105,14 @@
 
 struct NullProvider {
   NullProvider() {}
-  void* allocate(size_t, size_t) {
+  void* allocate(std::size_t, size_t) {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     throw std::runtime_error("");
 #else
     std::abort();
 #endif
   }
-  void deallocate(void*, size_t, size_t) {}
+  void deallocate(void*, std::size_t, size_t) {}
   void reset() {}
 
 private:
@@ -121,23 +121,23 @@
 
 struct NewDeleteProvider {
   NewDeleteProvider() {}
-  void* allocate(size_t s, size_t) { return ::operator new(s); }
-  void deallocate(void* p, size_t, size_t) { ::operator delete(p); }
+  void* allocate(std::size_t s, size_t) { return ::operator new(s); }
+  void deallocate(void* p, std::size_t, size_t) { ::operator delete(p); }
   void reset() {}
 
 private:
   DISALLOW_COPY(NewDeleteProvider);
 };
 
-template <size_t Size = 4096 * 10> // 10 pages worth of memory.
+template <std::size_t Size = 4096 * 10> // 10 pages worth of memory.
 struct BufferProvider {
   char buffer[Size];
   void* next   = &buffer;
-  size_t space = Size;
+  std::size_t space = Size;
 
   BufferProvider() {}
 
-  void* allocate(size_t s, size_t a) {
+  void* allocate(std::size_t s, size_t a) {
     void* ret = std::align(a, s, next, space);
     if (ret == nullptr) {
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -150,7 +150,7 @@
     return ret;
   }
 
-  void deallocate(void*, size_t, size_t) {}
+  void deallocate(void*, std::size_t, size_t) {}
 
   void reset() {
     next  = &buffer;
diff --git a/third_party/llvm-project/libcxx/test/support/type_algorithms.h b/third_party/llvm-project/libcxx/test/support/type_algorithms.h
index 823978b..95a282b 100644
--- a/third_party/llvm-project/libcxx/test/support/type_algorithms.h
+++ b/third_party/llvm-project/libcxx/test/support/type_algorithms.h
@@ -13,7 +13,7 @@
 
 #include "test_macros.h"
 
-namespace meta {
+namespace types {
 template <class... Types>
 struct type_list {};
 
@@ -100,6 +100,20 @@
 using floating_point_types = type_list<float, double, long double>;
 
 using arithmetic_types = concatenate_t<integral_types, floating_point_types>;
-} // namespace meta
+
+template <class T>
+using cv_qualified_versions = type_list<T, const T, volatile T, const volatile T>;
+
+template <class T>
+struct type_list_as_pointers;
+
+template <class... Types>
+struct type_list_as_pointers<type_list<Types...> > {
+  using type = type_list<Types*...>;
+};
+
+template <class T>
+using as_pointers = typename type_list_as_pointers<T>::type;
+} // namespace types
 
 #endif // TEST_SUPPORT_TYPE_ALGORITHMS_H
diff --git a/third_party/llvm-project/libcxx/test/support/uses_alloc_types.h b/third_party/llvm-project/libcxx/test/support/uses_alloc_types.h
index 9403572..d4489ff 100644
--- a/third_party/llvm-project/libcxx/test/support/uses_alloc_types.h
+++ b/third_party/llvm-project/libcxx/test/support/uses_alloc_types.h
@@ -101,7 +101,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 namespace detail {
 
-template <bool IsZero, size_t N, class ArgList, class ...Args>
+template <bool IsZero, std::size_t N, class ArgList, class ...Args>
 struct TakeNImp;
 
 template <class ArgList, class ...Args>
@@ -109,11 +109,11 @@
   typedef ArgList type;
 };
 
-template <size_t N, class ...A1, class F, class ...R>
+template <std::size_t N, class ...A1, class F, class ...R>
 struct TakeNImp<false, N, ArgumentListID<A1...>, F, R...>
     : TakeNImp<N-1 == 0, N - 1, ArgumentListID<A1..., F>, R...> {};
 
-template <size_t N, class ...Args>
+template <std::size_t N, class ...Args>
 struct TakeNArgs : TakeNImp<N == 0, N, ArgumentListID<>, Args...> {};
 
 template <class T>
@@ -263,7 +263,7 @@
     UsesAllocatorTestBaseStorage<CtorAlloc> alloc_store;
 };
 
-template <class Alloc, size_t Arity>
+template <class Alloc, std::size_t Arity>
 class UsesAllocatorV1 : public UsesAllocatorTestBase<UsesAllocatorV1<Alloc, Arity>, Alloc>
 {
 public:
@@ -297,7 +297,7 @@
 };
 
 
-template <class Alloc, size_t Arity>
+template <class Alloc, std::size_t Arity>
 class UsesAllocatorV2 : public UsesAllocatorTestBase<UsesAllocatorV2<Alloc, Arity>, Alloc>
 {
 public:
@@ -323,7 +323,7 @@
     {}
 };
 
-template <class Alloc, size_t Arity>
+template <class Alloc, std::size_t Arity>
 class UsesAllocatorV3 : public UsesAllocatorTestBase<UsesAllocatorV3<Alloc, Arity>, Alloc>
 {
 public:
@@ -355,7 +355,7 @@
     {}
 };
 
-template <class Alloc, size_t Arity>
+template <class Alloc, std::size_t Arity>
 class NotUsesAllocator : public UsesAllocatorTestBase<NotUsesAllocator<Alloc, Arity>, Alloc>
 {
 public:
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
index adceee2..bd1611f 100644
--- a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
@@ -3,13 +3,24 @@
 set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
 set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)
 
+# The find_package changes these variables. This leaves the build in an odd
+# state. Calling cmake a second time tries to write site config information in
+# the system's libc++. Restoring these setting after testing fixes this issue.
+set(LLVM_DIR_SAVE ${LLVM_DIR})
+set(Clang_DIR_SAVE ${Clang_DIR})
+
 find_package(Clang 16)
+if (NOT Clang_FOUND)
+  find_package(Clang 17)
+endif()
 
 set(SOURCES
     abi_tag_on_virtual.cpp
     hide_from_abi.cpp
-    robust_against_adl.cpp
+    proper_version_checks.cpp
     qualify_declval.cpp
+    robust_against_adl.cpp
+    uglify_attributes.cpp
 
     libcpp_module.cpp
    )
@@ -20,6 +31,9 @@
   return()
 endif()
 
+set(LLVM_DIR "${LLVM_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for LLVM." FORCE)
+set(Clang_DIR "${Clang_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for Clang." FORCE)
+
 message(STATUS "Found system-installed LLVM ${LLVM_PACKAGE_VERSION} with headers in ${LLVM_INCLUDE_DIRS}")
 
 set(CMAKE_CXX_STANDARD 20)
@@ -32,7 +46,16 @@
                            ${CLANG_INCLUDE_DIRS}
                            ${LLVM_INCLUDE_DIRS}
                           )
-target_compile_options(clangTidy INTERFACE -fno-rtti)
+target_compile_options(clangTidy INTERFACE
+                       -fno-rtti
+                       -fno-sanitize=address,hwaddress,undefined,thread,leak # ignore any sanitizers
+                      )
+
+if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  target_compile_options(clangTidy INTERFACE
+                         -fno-sanitize=memory,dataflow
+                        )
+endif()
 
 add_library(cxx-tidy MODULE ${SOURCES})
 target_link_libraries(cxx-tidy clangTidy)
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/libcpp_module.cpp b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/libcpp_module.cpp
index f1dfbf5..9ecb41e 100644
--- a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/libcpp_module.cpp
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/libcpp_module.cpp
@@ -11,8 +11,10 @@
 
 #include "abi_tag_on_virtual.hpp"
 #include "hide_from_abi.hpp"
-#include "robust_against_adl.hpp"
+#include "proper_version_checks.hpp"
 #include "qualify_declval.hpp"
+#include "robust_against_adl.hpp"
+#include "uglify_attributes.hpp"
 
 namespace {
 class LibcxxTestModule : public clang::tidy::ClangTidyModule {
@@ -20,7 +22,9 @@
   void addCheckFactories(clang::tidy::ClangTidyCheckFactories& check_factories) override {
     check_factories.registerCheck<libcpp::abi_tag_on_virtual>("libcpp-avoid-abi-tag-on-virtual");
     check_factories.registerCheck<libcpp::hide_from_abi>("libcpp-hide-from-abi");
+    check_factories.registerCheck<libcpp::proper_version_checks>("libcpp-cpp-version-check");
     check_factories.registerCheck<libcpp::robust_against_adl_check>("libcpp-robust-against-adl");
+    check_factories.registerCheck<libcpp::uglify_attributes>("libcpp-uglify-attributes");
     check_factories.registerCheck<libcpp::qualify_declval>("libcpp-qualify-declval");
   }
 };
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.cpp b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.cpp
new file mode 100644
index 0000000..2abc5ce
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.cpp
@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "proper_version_checks.hpp"
+
+#include <clang/Lex/Lexer.h>
+#include <clang/Lex/PPCallbacks.h>
+#include <clang/Lex/Preprocessor.h>
+
+namespace libcpp {
+namespace {
+class proper_version_checks_callbacks : public clang::PPCallbacks {
+public:
+  proper_version_checks_callbacks(clang::Preprocessor& preprocessor, clang::tidy::ClangTidyCheck& check)
+      : preprocessor_(preprocessor), check_(check) {}
+
+  void If(clang::SourceLocation location, clang::SourceRange condition_range, ConditionValueKind) override {
+    check_condition(location, condition_range);
+  }
+
+  void Elif(clang::SourceLocation location,
+            clang::SourceRange condition_range,
+            ConditionValueKind,
+            clang::SourceLocation if_location) override {
+    check_condition(location, condition_range);
+  }
+
+private:
+  void check_condition(clang::SourceLocation location, clang::SourceRange condition_range) {
+    std::string_view condition = clang::Lexer::getSourceText(
+        clang::CharSourceRange::getTokenRange(condition_range),
+        preprocessor_.getSourceManager(),
+        preprocessor_.getLangOpts());
+    if (preprocessor_.getSourceManager().isInMainFile(location))
+      return;
+
+    if (condition.starts_with("_LIBCPP_STD_VER") && condition.find(">") != std::string_view::npos &&
+        condition.find(">=") == std::string_view::npos)
+      check_.diag(location, "_LIBCPP_STD_VER >= version should be used instead of _LIBCPP_STD_VER > prev_version");
+
+    else if (condition.starts_with("__cplusplus"))
+      check_.diag(location, "Use _LIBCPP_STD_VER instead of __cplusplus to constrain based on the C++ version");
+
+    else if (condition == "_LIBCPP_STD_VER >= 11")
+      check_.diag(location, "_LIBCPP_STD_VER >= 11 is always true. Did you mean '#ifndef _LIBCPP_CXX03_LANG'?");
+
+    else if (condition.starts_with("_LIBCPP_STD_VER >= ") &&
+             std::ranges::none_of(std::array{"14", "17", "20", "23"}, [&](auto val) {
+               return condition.find(val) != std::string_view::npos;
+             }))
+      check_.diag(location, "Not a valid value for _LIBCPP_STD_VER. Use 14, 17, 20 or 23");
+  }
+
+  clang::Preprocessor& preprocessor_;
+  clang::tidy::ClangTidyCheck& check_;
+};
+} // namespace
+
+proper_version_checks::proper_version_checks(llvm::StringRef name, clang::tidy::ClangTidyContext* context)
+    : clang::tidy::ClangTidyCheck(name, context) {}
+
+void proper_version_checks::registerPPCallbacks(
+    const clang::SourceManager& source_manager,
+    clang::Preprocessor* preprocessor,
+    clang::Preprocessor* module_expander) {
+  preprocessor->addPPCallbacks(std::make_unique<proper_version_checks_callbacks>(*preprocessor, *this));
+}
+
+} // namespace libcpp
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.hpp b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.hpp
new file mode 100644
index 0000000..5c33b95
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/proper_version_checks.hpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang-tidy/ClangTidyCheck.h"
+
+namespace libcpp {
+class proper_version_checks : public clang::tidy::ClangTidyCheck {
+public:
+  proper_version_checks(llvm::StringRef, clang::tidy::ClangTidyContext*);
+  void registerPPCallbacks(const clang::SourceManager& source_manager,
+                           clang::Preprocessor* preprocessor,
+                           clang::Preprocessor* module_expander) override;
+};
+} // namespace libcpp
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.cpp b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.cpp
new file mode 100644
index 0000000..038788d
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.cpp
@@ -0,0 +1,123 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang-tidy/ClangTidyCheck.h"
+#include "clang-tidy/ClangTidyModuleRegistry.h"
+
+#include "uglify_attributes.hpp"
+
+#include <algorithm>
+#include <array>
+#include <span>
+#include <string_view>
+
+namespace {
+bool isUgly(std::string_view str) {
+  if (str.size() < 2)
+    return false;
+  if (str[0] == '_' && str[1] >= 'A' && str[1] <= 'Z')
+    return true;
+  return str.find("__") != std::string_view::npos;
+}
+
+std::vector<const char*> get_standard_attributes(const clang::LangOptions& lang_opts) {
+  std::vector<const char*> attributes = {"noreturn", "carries_dependency"};
+
+  if (lang_opts.CPlusPlus14)
+    attributes.emplace_back("deprecated");
+
+  if (lang_opts.CPlusPlus17) {
+    attributes.emplace_back("fallthrough");
+    attributes.emplace_back("nodiscard");
+    attributes.emplace_back("maybe_unused");
+  }
+
+  if (lang_opts.CPlusPlus20) {
+    attributes.emplace_back("likely");
+    attributes.emplace_back("unlikely");
+    attributes.emplace_back("no_unique_address");
+  }
+
+  if (lang_opts.CPlusPlus2b) {
+    attributes.emplace_back("assume");
+  }
+
+  return attributes;
+}
+
+AST_MATCHER(clang::Attr, isPretty) {
+  if (Node.isKeywordAttribute())
+    return false;
+  if (Node.isCXX11Attribute() && !Node.hasScope()) {
+    if (isUgly(Node.getAttrName()->getName()))
+      return false;
+    return !llvm::is_contained(
+        get_standard_attributes(Finder->getASTContext().getLangOpts()), Node.getAttrName()->getName());
+  }
+  if (Node.hasScope())
+    if (!isUgly(Node.getScopeName()->getName()))
+      return true;
+  if (Node.getAttrName())
+    return !isUgly(Node.getAttrName()->getName());
+
+  return false;
+}
+
+std::optional<std::string> getUglyfiedCXX11Attr(const clang::Attr& attr) {
+  // TODO: Don't emit FixItHints for attributes with `using` in them or emit correct fixes.
+
+  std::string attr_string;
+  if (attr.isClangScope())
+    attr_string += "_Clang::";
+  else if (attr.isGNUScope())
+    attr_string += "__gnu__::";
+
+  if (!attr.getAttrName()->getName().starts_with("__")) {
+    attr_string += "__";
+    attr_string += attr.getAttrName()->getName();
+    attr_string += "__";
+  } else {
+    attr_string += attr.getAttrName()->getName();
+  }
+  return std::move(attr_string);
+}
+
+std::optional<std::string> getUglyfiedGNUAttr(const clang::Attr& attr) {
+  return "__" + attr.getAttrName()->getName().str() + "__";
+}
+
+std::optional<std::string> getUglified(const clang::Attr& attr) {
+  if (attr.isCXX11Attribute()) {
+    return getUglyfiedCXX11Attr(attr);
+  } else if (attr.isGNUAttribute()) {
+    return getUglyfiedGNUAttr(attr);
+  }
+
+  return std::nullopt;
+}
+} // namespace
+
+namespace libcpp {
+uglify_attributes::uglify_attributes(llvm::StringRef name, clang::tidy::ClangTidyContext* context)
+    : clang::tidy::ClangTidyCheck(name, context) {}
+
+void uglify_attributes::registerMatchers(clang::ast_matchers::MatchFinder* finder) {
+  using namespace clang::ast_matchers;
+  finder->addMatcher(attr(isPretty()).bind("normal_attribute"), this);
+}
+
+void uglify_attributes::check(const clang::ast_matchers::MatchFinder::MatchResult& result) {
+  if (const auto* attr = result.Nodes.getNodeAs<clang::Attr>("normal_attribute"); attr != nullptr) {
+    auto diagnostic = diag(attr->getLoc(), "Non-standard attributes should use the _Ugly spelling");
+    auto uglified   = getUglified(*attr);
+    if (uglified.has_value()) {
+      diagnostic << clang::FixItHint::CreateReplacement(attr->getRange(), *uglified);
+    }
+  }
+}
+} // namespace libcpp
diff --git a/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.hpp b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.hpp
new file mode 100644
index 0000000..a3a06e6
--- /dev/null
+++ b/third_party/llvm-project/libcxx/test/tools/clang_tidy_checks/uglify_attributes.hpp
@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang-tidy/ClangTidyCheck.h"
+
+namespace libcpp {
+class uglify_attributes : public clang::tidy::ClangTidyCheck {
+public:
+  uglify_attributes(llvm::StringRef, clang::tidy::ClangTidyContext*);
+  void registerMatchers(clang::ast_matchers::MatchFinder*) override;
+  void check(const clang::ast_matchers::MatchFinder::MatchResult&) override;
+};
+} // namespace libcpp
diff --git a/third_party/llvm-project/libcxx/utils/ci/Dockerfile b/third_party/llvm-project/libcxx/utils/ci/Dockerfile
index 2a2e8e5..85d0ff1 100644
--- a/third_party/llvm-project/libcxx/utils/ci/Dockerfile
+++ b/third_party/llvm-project/libcxx/utils/ci/Dockerfile
@@ -15,7 +15,9 @@
 #   $ docker run --env-file <secrets> -it $(docker build -q libcxx/utils/ci)
 #
 # The environment variables in `<secrets>` should be the ones necessary
-# to run a BuildKite agent.
+# to run a BuildKite agent:
+#
+#   BUILDKITE_AGENT_TOKEN=<token>
 #
 # If you're only looking to run the Docker image locally for debugging a
 # build bot, see the `run-buildbot-container` script located in this directory.
@@ -36,7 +38,13 @@
 RUN apt-get update && apt-get install -y bash curl
 
 # Install various tools used by the build or the test suite
-RUN apt-get update && apt-get install -y ninja-build python3 python3-sphinx python3-distutils python3-psutil git gdb
+#RUN apt-get update && apt-get install -y ninja-build python3 python3-sphinx python3-distutils python3-psutil git gdb
+# TODO add ninja-build once 1.11 is available in Ubuntu, also remove the manual installation.
+RUN apt-get update && apt-get install -y python3 python3-sphinx python3-distutils python3-psutil git gdb
+RUN apt-get update && apt-get install -y wget && \
+  wget -qO /usr/local/bin/ninja.gz https://github.com/ninja-build/ninja/releases/latest/download/ninja-linux.zip && \
+  gunzip /usr/local/bin/ninja.gz && \
+  chmod a+x /usr/local/bin/ninja
 
 # Install dependencies required to run the LLDB data formatter tests
 RUN apt-get update && apt-get install -y python3 python3-dev libpython3-dev uuid-dev libncurses5-dev swig3.0 libxml2-dev libedit-dev
@@ -58,7 +66,7 @@
 # LLVM 15, we still need to have Clang 12 in this Docker image because the LLVM
 # 14 release branch CI uses it. The tip-of-trunk CI will never use Clang 12,
 # though.
-ENV LLVM_HEAD_VERSION=16
+ENV LLVM_HEAD_VERSION=17
 RUN apt-get update && apt-get install -y lsb-release wget software-properties-common
 RUN wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
 RUN bash /tmp/llvm.sh $(($LLVM_HEAD_VERSION - 3)) # for CI transitions
@@ -66,41 +74,41 @@
 RUN bash /tmp/llvm.sh $(($LLVM_HEAD_VERSION - 1)) # latest release
 RUN bash /tmp/llvm.sh $LLVM_HEAD_VERSION          # current ToT
 
-# Make the latest version of Clang the "default" compiler on the system
-# TODO: After branching for LLVM 16, all jobs will be using an
-#       explicitly-versioned version of Clang instead, so we can get rid of
-#       these symlinks.
-RUN ln -fs /usr/bin/clang++-14 /usr/bin/c++ && [ -e $(readlink /usr/bin/c++) ]
-RUN ln -fs /usr/bin/clang-14 /usr/bin/cc && [ -e $(readlink /usr/bin/cc) ]
+# Install clang-scan-deps, which is required to build modules; always all supported versions.
+RUN apt-get update && apt-get install -y clang-tools-$(($LLVM_HEAD_VERSION - 3)) \
+                                         clang-tools-$(($LLVM_HEAD_VERSION - 2)) \
+                                         clang-tools-$(($LLVM_HEAD_VERSION - 1)) \
+                                         clang-tools-$LLVM_HEAD_VERSION
 
 # Install clang-format; always use the lastest stable branch.
-# TODO LLVM 16 remove hard-coded version 14 and the symlinks
 RUN apt-get update && apt-get install -y clang-format-$(($LLVM_HEAD_VERSION - 2)) clang-format-$(($LLVM_HEAD_VERSION - 1))
-RUN ln -s /usr/bin/clang-format-14 /usr/bin/clang-format && [ -e $(readlink /usr/bin/clang-format) ]
-RUN ln -s /usr/bin/git-clang-format-14 /usr/bin/git-clang-format && [ -e $(readlink /usr/bin/git-clang-format) ]
 
 # Install clang-tidy
-# TODO LLVM 16 remove hard-coded version 14 and the symlink
-RUN apt-get update && apt-get install -y clang-tidy-$(($LLVM_HEAD_VERSION - 1)) clang-tidy-$LLVM_HEAD_VERSION clang-tidy-14
-RUN ln -s /usr/bin/clang-tidy-14 /usr/bin/clang-tidy && [ -e $(readlink /usr/bin/clang-tidy) ]
+RUN apt-get update && apt-get install -y clang-tidy-$(($LLVM_HEAD_VERSION - 2)) clang-tidy-$((LLVM_HEAD_VERSION - 1))
 
 # Install llvm-dev and libclang-dev to compile custom clang-tidy checks
 RUN apt-get update && apt-get install -y llvm-$(($LLVM_HEAD_VERSION - 1))-dev     llvm-$(($LLVM_HEAD_VERSION - 2))-dev \
                                      libclang-$(($LLVM_HEAD_VERSION - 1))-dev libclang-$(($LLVM_HEAD_VERSION - 2))-dev
 
-# TODO LLVM16 Don't install llvm-16-dev explicitly
-RUN apt-get update && apt-get install -y llvm-16-dev libclang-16-dev
-
 # Install the most recent GCC, like clang install the previous version as a transition.
 ENV GCC_LATEST_VERSION=12
 RUN apt-get update && apt install -y gcc-$((GCC_LATEST_VERSION - 1)) g++-$((GCC_LATEST_VERSION - 1))
 RUN apt-get update && apt install -y gcc-$GCC_LATEST_VERSION g++-$GCC_LATEST_VERSION
 
+# Remove all, no longer needed, apt data
+RUN rm -rf /var/lib/apt/lists/*
+
 # Install a recent CMake
 RUN wget https://github.com/Kitware/CMake/releases/download/v3.21.1/cmake-3.21.1-linux-x86_64.sh -O /tmp/install-cmake.sh
 RUN bash /tmp/install-cmake.sh --prefix=/usr --exclude-subdir --skip-license
 RUN rm /tmp/install-cmake.sh
 
+# Install a newer CMake for modules
+# TODO Remove the duplicated installation when all runtimes can be build with CMake 3.26.
+RUN wget https://github.com/Kitware/CMake/releases/download/v3.26.1/cmake-3.26.1-linux-x86_64.sh -O /tmp/install-cmake.sh
+RUN bash /tmp/install-cmake.sh --prefix=/opt --exclude-subdir --skip-license
+RUN rm /tmp/install-cmake.sh
+
 # Change the user to a non-root user, since some of the libc++ tests
 # (e.g. filesystem) require running as non-root. Also setup passwordless sudo.
 RUN apt-get update && apt-get install -y sudo
diff --git a/third_party/llvm-project/libcxx/utils/ci/apple-install-libcxx.sh b/third_party/llvm-project/libcxx/utils/ci/apple-install-libcxx.sh
index dd34915..15504f5 100755
--- a/third_party/llvm-project/libcxx/utils/ci/apple-install-libcxx.sh
+++ b/third_party/llvm-project/libcxx/utils/ci/apple-install-libcxx.sh
@@ -108,6 +108,12 @@
 }
 
 for arch in ${architectures}; do
+    # Construct the target-triple that we're testing for. Otherwise, the target triple is currently detected
+    # as <arch>-apple-darwin<version> instead of <arch>-apple-macosx<version>, which trips up the test suite.
+    # TODO: This shouldn't be necessary anymore if `clang -print-target-triple` behaved properly, see https://llvm.org/PR61762.
+    #       Then LLVM would guess the LLVM_DEFAULT_TARGET_TRIPLE properly and we wouldn't have to specify it.
+    target=$(xcrun clang -arch ${arch} -xc - -### 2>&1 | grep --only-matching -E '"-triple" ".+?"' | grep --only-matching -E '"[^ ]+-apple-[^ ]+?"' | tr -d '"')
+
     step "Building libc++.dylib and libc++abi.dylib for architecture ${arch}"
     mkdir -p "${build_dir}/${arch}"
     xcrun cmake -S "${llvm_root}/runtimes" \
@@ -119,7 +125,11 @@
                 -DCMAKE_INSTALL_PREFIX="${build_dir}/${arch}-install" \
                 -DCMAKE_INSTALL_NAME_DIR="/usr/lib" \
                 -DCMAKE_OSX_ARCHITECTURES="${arch}" \
-                -DLIBCXXABI_LIBRARY_VERSION="${version}"
+                -DLIBCXXABI_LIBRARY_VERSION="${version}" \
+                -DLIBCXX_LIBRARY_VERSION="${version}" \
+                -DLIBCXX_TEST_PARAMS="target_triple=${target}" \
+                -DLIBCXXABI_TEST_PARAMS="target_triple=${target}" \
+                -DLIBUNWIND_TEST_PARAMS="target_triple=${target}"
 
     if [ "$headers_only" = true ]; then
         xcrun cmake --build "${build_dir}/${arch}" --target install-cxx-headers install-cxxabi-headers -- -v
@@ -150,6 +160,9 @@
     universal_dylib libc++.1.dylib
     universal_dylib libc++abi.dylib
     (cd "${install_dir}/usr/lib" && ln -s "libc++.1.dylib" libc++.dylib)
+
+    experimental_libs=$(for arch in ${architectures}; do echo "${build_dir}/${arch}-install/lib/libc++experimental.a"; done)
+    xcrun lipo -create ${experimental_libs} -output "${install_dir}/usr/lib/libc++experimental.a"
 fi
 
 # Install the headers by copying the headers from one of the built architectures
diff --git a/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline-clang.yml b/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline-clang.yml
index b8ad2c1..7ed5874 100644
--- a/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline-clang.yml
+++ b/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline-clang.yml
@@ -14,7 +14,7 @@
 # in various configurations.
 #
 env:
-    LLVM_HEAD_VERSION: "16"
+    LLVM_HEAD_VERSION: "17"
 steps:
   - label: "Building clang"
     commands:
diff --git a/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline.yml b/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline.yml
index c6339e4..474138d 100644
--- a/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/third_party/llvm-project/libcxx/utils/ci/buildkite-pipeline.yml
@@ -23,8 +23,8 @@
 # Theses numbers are available in all runners, making it easier to update the
 # version number.
 env:
-    LLVM_STABLE_VERSION: "15"
-    LLVM_HEAD_VERSION: "16"
+    LLVM_STABLE_VERSION: "16"
+    LLVM_HEAD_VERSION: "17"
     GCC_STABLE_VERSION: "12"
 steps:
   #
@@ -36,7 +36,9 @@
     artifact_paths:
       - "**/clang-format.patch"
     env:
-        GIT_CLANG_FORMAT: "/usr/bin/git-clang-format-${LLVM_STABLE_VERSION}"
+        GIT_CLANG_FORMAT: "/usr/bin/git-clang-format-${LLVM_STABLE_VERSION} --binary clang-format-${LLVM_STABLE_VERSION}"
+        CC: "clang-${LLVM_HEAD_VERSION}"
+        CXX: "clang++-${LLVM_HEAD_VERSION}"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -44,8 +46,6 @@
       automatic:
         - exit_status: -1  # Agent was lost
           limit: 2
-    soft_fail:
-        - exit_status: 1
     timeout_in_minutes: 120
 
   - label: "Generated output"
@@ -53,6 +53,10 @@
     artifact_paths:
       - "**/generated_output.patch"
       - "**/generated_output.status"
+    env:
+        CC: "clang-${LLVM_HEAD_VERSION}"
+        CXX: "clang++-${LLVM_HEAD_VERSION}"
+        CLANG_FORMAT: "/usr/bin/clang-format-${LLVM_STABLE_VERSION}"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -66,6 +70,9 @@
     command: "libcxx/utils/ci/run-buildbot documentation"
     artifact_paths:
       - "**/test-results.xml"
+    env:
+        CC: "clang-${LLVM_HEAD_VERSION}"
+        CXX: "clang++-${LLVM_HEAD_VERSION}"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -90,6 +97,7 @@
     env:
         CC: "gcc-${GCC_STABLE_VERSION}"
         CXX: "g++-${GCC_STABLE_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -125,6 +133,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -238,23 +247,7 @@
     env:
         CC: "gcc-${GCC_STABLE_VERSION}"
         CXX: "g++-${GCC_STABLE_VERSION}"
-    agents:
-      queue: "libcxx-builders"
-      os: "linux"
-    retry:
-      automatic:
-        - exit_status: -1  # Agent was lost
-          limit: 2
-    timeout_in_minutes: 120
-
-  - label: "Clang 14"
-    command: "libcxx/utils/ci/run-buildbot generic-cxx2b"
-    artifact_paths:
-      - "**/test-results.xml"
-      - "**/*.abilist"
-    env:
-        CC: "clang-14"
-        CXX: "clang++-14"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -272,6 +265,26 @@
     env:
         CC: "clang-15"
         CXX: "clang++-15"
+        # TODO LLVM18: Enable clang-tidy
+        # ENABLE_CLANG_TIDY: "On"
+    agents:
+      queue: "libcxx-builders"
+      os: "linux"
+    retry:
+      automatic:
+        - exit_status: -1  # Agent was lost
+          limit: 2
+    timeout_in_minutes: 120
+
+  - label: "Clang 16"
+    command: "libcxx/utils/ci/run-buildbot generic-cxx2b"
+    artifact_paths:
+      - "**/test-results.xml"
+      - "**/*.abilist"
+    env:
+        CC: "clang-16"
+        CXX: "clang++-16"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -292,6 +305,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -309,6 +323,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -326,6 +341,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -343,6 +359,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -382,6 +399,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -399,6 +417,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -416,6 +435,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -433,6 +453,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -450,6 +471,25 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
+    agents:
+      queue: "libcxx-builders"
+      os: "linux"
+    retry:
+      automatic:
+        - exit_status: -1  # Agent was lost
+          limit: 2
+    timeout_in_minutes: 120
+
+  - label: "Modular build with Local Submodule Visibility"
+    command: "libcxx/utils/ci/run-buildbot generic-modules-lsv"
+    artifact_paths:
+      - "**/test-results.xml"
+      - "**/*.abilist"
+    env:
+        CC: "clang-${LLVM_HEAD_VERSION}"
+        CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -469,6 +509,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -486,6 +527,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -503,6 +545,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -520,6 +563,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -537,6 +581,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -554,6 +599,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -571,6 +617,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -588,6 +635,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -605,6 +653,7 @@
       env:
           CC: "clang-${LLVM_HEAD_VERSION}"
           CXX: "clang++-${LLVM_HEAD_VERSION}"
+          ENABLE_CLANG_TIDY: "On"
       agents:
         queue: "libcxx-builders"
         os: "linux"
@@ -622,6 +671,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -640,6 +690,7 @@
     env:
         CC: "clang-${LLVM_HEAD_VERSION}"
         CXX: "clang++-${LLVM_HEAD_VERSION}"
+        ENABLE_CLANG_TIDY: "On"
     agents:
       queue: "libcxx-builders"
       os: "linux"
@@ -732,7 +783,7 @@
   - group: ":apple: Apple"
     steps:
     - label: "MacOS x86_64"
-      command: "libcxx/utils/ci/run-buildbot apple-cxx20"
+      command: "libcxx/utils/ci/run-buildbot generic-cxx20"
       artifact_paths:
         - "**/test-results.xml"
         - "**/*.abilist"
@@ -747,7 +798,7 @@
       timeout_in_minutes: 120
 
     - label: "MacOS arm64"
-      command: "libcxx/utils/ci/run-buildbot apple-cxx20"
+      command: "libcxx/utils/ci/run-buildbot generic-cxx20"
       artifact_paths:
         - "**/test-results.xml"
         - "**/*.abilist"
@@ -761,6 +812,20 @@
             limit: 2
       timeout_in_minutes: 120
 
+    - label: "MacOS with Modules"
+      command: "libcxx/utils/ci/run-buildbot generic-modules"
+      artifact_paths:
+        - "**/test-results.xml"
+        - "**/*.abilist"
+      agents:
+        queue: "libcxx-builders"
+        os: "macos"
+      retry:
+        automatic:
+          - exit_status: -1  # Agent was lost
+            limit: 2
+      timeout_in_minutes: 120
+
     # Build with the configuration we use to generate libc++.dylib on Apple platforms
     - label: "Apple system"
       command: "libcxx/utils/ci/run-buildbot apple-system"
@@ -960,3 +1025,22 @@
           - exit_status: -1  # Agent was lost
             limit: 2
       timeout_in_minutes: 120
+
+  - group: "FreeBSD"
+    steps:
+    - label: "FreeBSD 13 amd64"
+      command: "libcxx/utils/ci/run-buildbot generic-cxx2b"
+      artifact_paths:
+        - "**/test-results.xml"
+        - "**/*.abilist"
+      env:
+          CC: "clang15"
+          CXX: "clang++15"
+      agents:
+        queue: "libcxx-builders"
+        os: "freebsd"
+      retry:
+        automatic:
+          - exit_status: -1  # Agent was lost
+            limit: 2
+      timeout_in_minutes: 120
diff --git a/third_party/llvm-project/libcxx/utils/ci/run-buildbot b/third_party/llvm-project/libcxx/utils/ci/run-buildbot
index 8ec401c..15b8688 100755
--- a/third_party/llvm-project/libcxx/utils/ci/run-buildbot
+++ b/third_party/llvm-project/libcxx/utils/ci/run-buildbot
@@ -38,13 +38,16 @@
 CXX                 The C++ compiler to use, this value is used by CMake. This
                     variable is optional.
 
+CLANG_FORMAT        The clang-format binary to use when generating the format
+                    ignore list.
+
 GIT_CLANG_FORMAT    The git-clang-format binary to use in the 'format' builder.
                     When the value is omitted, it defaults to
                     'git-clang-format'. This variable or its fallback must work
                     when running the 'format' builder.
 
 ENABLE_CLANG_TIDY   Whether to compile and run clang-tidy checks. This variable
-                    is optional
+                    is optional.
 EOF
 }
 
@@ -184,10 +187,8 @@
     fi
     ${GIT_CLANG_FORMAT} \
         --diff \
-        --extensions ',h,hh,hpp,hxx,c,cc,cxx,cpp' HEAD~1 \
-        -- \
-            libcxx/{benchmarks,include,src,test} \
-            libcxxabi/{fuzz,include,src,test} \
+        --extensions ',h,hpp,c,cpp,inc,ipp' HEAD~1 \
+        -- $(find libcxx/{benchmarks,include,src}/ -type f | grep -vf libcxx/utils/data/ignore_format.txt) \
         | tee ${BUILD_DIR}/clang-format.patch
     # Check if the diff is empty, fail otherwise.
     ! grep -q '^--- a' ${BUILD_DIR}/clang-format.patch
@@ -211,6 +212,18 @@
         false
     fi
 
+    ${MONOREPO_ROOT}/libcxx/utils/generate_ignore_format.sh
+    git diff | tee ${BUILD_DIR}/generated_output.patch
+    git ls-files -o --exclude-standard | tee ${BUILD_DIR}/generated_output.status
+    ! grep -q '^--- a' ${BUILD_DIR}/generated_output.patch || false
+    if [ -s ${BUILD_DIR}/generated_output.status ]; then
+        echo "It looks like the list of not formatted files has changed."
+        echo "If a file is now properly formatted with clang-format, remove the file name from "
+        echo "libcxx/utils/data/ignore_format.txt. Otherwise you have to fix the"
+        echo "formatting of some of the changed files."
+        false
+    fi
+
     # Reject patches that introduce non-ASCII characters or hard tabs.
     # Depends on LC_COLLATE set at the top of this script.
     ! grep -rn '[^ -~]' libcxx/include libcxx/src libcxx/test libcxx/benchmarks \
@@ -371,6 +384,12 @@
     check-runtimes
     check-abi-list
 ;;
+generic-modules-lsv)
+    clean
+    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-modules-lsv.cmake"
+    check-runtimes
+    check-abi-list
+;;
 #
 # Parts removed
 #
@@ -417,8 +436,7 @@
 ;;
 generic-noexceptions)
     clean
-    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-noexceptions.cmake" \
-                   -DLIBCXX_ENABLE_CLANG_TIDY=ON
+    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-noexceptions.cmake"
     check-runtimes
     check-abi-list
 ;;
@@ -430,12 +448,6 @@
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-abi-unstable.cmake"
     check-runtimes
 ;;
-apple-cxx20)
-    clean
-    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx20.cmake"
-    check-runtimes
-    check-abi-list
-;;
 apple-system)
     clean
 
@@ -478,11 +490,7 @@
     PARAMS+=";cxx_runtime_root=${OSX_ROOTS}/macOS/libc++/${DEPLOYMENT_TARGET}"
     PARAMS+=";abi_runtime_root=${OSX_ROOTS}/macOS/libc++abi/${DEPLOYMENT_TARGET}"
     PARAMS+=";unwind_runtime_root=${OSX_ROOTS}/macOS/libunwind/${DEPLOYMENT_TARGET}"
-    PARAMS+=";use_system_cxx_lib=True"
     PARAMS+=";enable_assertions=True"
-    # TODO: Enable experimental features during back-deployment -- right now some of the availability
-    #       annotations are incorrect, leading to test failures that could be avoided.
-    PARAMS+=";enable_experimental=False"
 
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_CONFIG="apple-libc++-backdeployment.cfg.in" \
@@ -520,10 +528,6 @@
     PARAMS+=";cxx_runtime_root=${OSX_ROOTS}/macOS/libc++/${DEPLOYMENT_TARGET}"
     PARAMS+=";abi_runtime_root=${OSX_ROOTS}/macOS/libc++abi/${DEPLOYMENT_TARGET}"
     PARAMS+=";unwind_runtime_root=${OSX_ROOTS}/macOS/libunwind/${DEPLOYMENT_TARGET}"
-    PARAMS+=";use_system_cxx_lib=True"
-    # TODO: Enable experimental features during back-deployment -- right now some of the availability
-    #       annotations are incorrect, leading to test failures that could be avoided.
-    PARAMS+=";enable_experimental=False"
 
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_CONFIG="apple-libc++-backdeployment.cfg.in" \
diff --git a/third_party/llvm-project/libcxx/utils/data/ignore_format.txt b/third_party/llvm-project/libcxx/utils/data/ignore_format.txt
new file mode 100644
index 0000000..ed596ab
--- /dev/null
+++ b/third_party/llvm-project/libcxx/utils/data/ignore_format.txt
@@ -0,0 +1,838 @@
+libcxx/benchmarks/CartesianBenchmarks.h
+libcxx/benchmarks/ContainerBenchmarks.h
+libcxx/benchmarks/GenerateInput.h
+libcxx/benchmarks/Utilities.h
+libcxx/benchmarks/VariantBenchmarks.h
+libcxx/benchmarks/algorithms/common.h
+libcxx/benchmarks/algorithms/lower_bound.bench.cpp
+libcxx/benchmarks/algorithms/make_heap.bench.cpp
+libcxx/benchmarks/algorithms/make_heap_then_sort_heap.bench.cpp
+libcxx/benchmarks/algorithms.partition_point.bench.cpp
+libcxx/benchmarks/algorithms/pop_heap.bench.cpp
+libcxx/benchmarks/algorithms/push_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_make_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_make_heap_then_sort_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_pop_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_push_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_sort.bench.cpp
+libcxx/benchmarks/algorithms/ranges_sort_heap.bench.cpp
+libcxx/benchmarks/algorithms/ranges_stable_sort.bench.cpp
+libcxx/benchmarks/algorithms/sort.bench.cpp
+libcxx/benchmarks/algorithms/sort_heap.bench.cpp
+libcxx/benchmarks/algorithms/stable_sort.bench.cpp
+libcxx/benchmarks/allocation.bench.cpp
+libcxx/benchmarks/deque.bench.cpp
+libcxx/benchmarks/filesystem.bench.cpp
+libcxx/benchmarks/formatter_float.bench.cpp
+libcxx/benchmarks/formatter_int.bench.cpp
+libcxx/benchmarks/format_to.bench.cpp
+libcxx/benchmarks/format_to_n.bench.cpp
+libcxx/benchmarks/function.bench.cpp
+libcxx/benchmarks/map.bench.cpp
+libcxx/benchmarks/ordered_set.bench.cpp
+libcxx/benchmarks/random.bench.cpp
+libcxx/benchmarks/string.bench.cpp
+libcxx/benchmarks/stringstream.bench.cpp
+libcxx/benchmarks/unordered_set_operations.bench.cpp
+libcxx/benchmarks/vector_operations.bench.cpp
+libcxx/include/__algorithm/binary_search.h
+libcxx/include/__algorithm/clamp.h
+libcxx/include/__algorithm/comp.h
+libcxx/include/__algorithm/comp_ref_type.h
+libcxx/include/__algorithm/copy_backward.h
+libcxx/include/__algorithm/copy.h
+libcxx/include/__algorithm/copy_if.h
+libcxx/include/__algorithm/copy_move_common.h
+libcxx/include/__algorithm/copy_n.h
+libcxx/include/__algorithm/equal.h
+libcxx/include/__algorithm/equal_range.h
+libcxx/include/__algorithm/fill.h
+libcxx/include/__algorithm/fill_n.h
+libcxx/include/__algorithm/find_end.h
+libcxx/include/__algorithm/find_first_of.h
+libcxx/include/__algorithm/for_each.h
+libcxx/include/__algorithm/for_each_n.h
+libcxx/include/__algorithm/generate.h
+libcxx/include/__algorithm/generate_n.h
+libcxx/include/__algorithm/half_positive.h
+libcxx/include/__algorithm/includes.h
+libcxx/include/__algorithm/in_found_result.h
+libcxx/include/__algorithm/in_fun_result.h
+libcxx/include/__algorithm/in_in_out_result.h
+libcxx/include/__algorithm/in_in_result.h
+libcxx/include/__algorithm/in_out_out_result.h
+libcxx/include/__algorithm/in_out_result.h
+libcxx/include/__algorithm/inplace_merge.h
+libcxx/include/__algorithm/is_heap.h
+libcxx/include/__algorithm/is_heap_until.h
+libcxx/include/__algorithm/is_partitioned.h
+libcxx/include/__algorithm/is_permutation.h
+libcxx/include/__algorithm/is_sorted.h
+libcxx/include/__algorithm/is_sorted_until.h
+libcxx/include/__algorithm/iterator_operations.h
+libcxx/include/__algorithm/iter_swap.h
+libcxx/include/__algorithm/lexicographical_compare.h
+libcxx/include/__algorithm/lower_bound.h
+libcxx/include/__algorithm/make_heap.h
+libcxx/include/__algorithm/make_projected.h
+libcxx/include/__algorithm/max_element.h
+libcxx/include/__algorithm/max.h
+libcxx/include/__algorithm/merge.h
+libcxx/include/__algorithm/min_element.h
+libcxx/include/__algorithm/min.h
+libcxx/include/__algorithm/minmax_element.h
+libcxx/include/__algorithm/minmax.h
+libcxx/include/__algorithm/min_max_result.h
+libcxx/include/__algorithm/mismatch.h
+libcxx/include/__algorithm/move_backward.h
+libcxx/include/__algorithm/move.h
+libcxx/include/__algorithm/next_permutation.h
+libcxx/include/__algorithm/nth_element.h
+libcxx/include/__algorithm/partial_sort_copy.h
+libcxx/include/__algorithm/partial_sort.h
+libcxx/include/__algorithm/partition_copy.h
+libcxx/include/__algorithm/partition.h
+libcxx/include/__algorithm/partition_point.h
+libcxx/include/__algorithm/pop_heap.h
+libcxx/include/__algorithm/prev_permutation.h
+libcxx/include/__algorithm/push_heap.h
+libcxx/include/__algorithm/ranges_adjacent_find.h
+libcxx/include/__algorithm/ranges_all_of.h
+libcxx/include/__algorithm/ranges_any_of.h
+libcxx/include/__algorithm/ranges_binary_search.h
+libcxx/include/__algorithm/ranges_clamp.h
+libcxx/include/__algorithm/ranges_copy_backward.h
+libcxx/include/__algorithm/ranges_copy.h
+libcxx/include/__algorithm/ranges_copy_if.h
+libcxx/include/__algorithm/ranges_copy_n.h
+libcxx/include/__algorithm/ranges_count.h
+libcxx/include/__algorithm/ranges_count_if.h
+libcxx/include/__algorithm/ranges_equal.h
+libcxx/include/__algorithm/ranges_equal_range.h
+libcxx/include/__algorithm/ranges_fill.h
+libcxx/include/__algorithm/ranges_fill_n.h
+libcxx/include/__algorithm/ranges_find_end.h
+libcxx/include/__algorithm/ranges_find_first_of.h
+libcxx/include/__algorithm/ranges_find.h
+libcxx/include/__algorithm/ranges_find_if.h
+libcxx/include/__algorithm/ranges_find_if_not.h
+libcxx/include/__algorithm/ranges_for_each.h
+libcxx/include/__algorithm/ranges_for_each_n.h
+libcxx/include/__algorithm/ranges_generate.h
+libcxx/include/__algorithm/ranges_generate_n.h
+libcxx/include/__algorithm/ranges_includes.h
+libcxx/include/__algorithm/ranges_inplace_merge.h
+libcxx/include/__algorithm/ranges_is_heap.h
+libcxx/include/__algorithm/ranges_is_heap_until.h
+libcxx/include/__algorithm/ranges_is_partitioned.h
+libcxx/include/__algorithm/ranges_is_permutation.h
+libcxx/include/__algorithm/ranges_is_sorted.h
+libcxx/include/__algorithm/ranges_is_sorted_until.h
+libcxx/include/__algorithm/ranges_lexicographical_compare.h
+libcxx/include/__algorithm/ranges_lower_bound.h
+libcxx/include/__algorithm/ranges_make_heap.h
+libcxx/include/__algorithm/ranges_max_element.h
+libcxx/include/__algorithm/ranges_max.h
+libcxx/include/__algorithm/ranges_merge.h
+libcxx/include/__algorithm/ranges_min_element.h
+libcxx/include/__algorithm/ranges_min.h
+libcxx/include/__algorithm/ranges_minmax_element.h
+libcxx/include/__algorithm/ranges_minmax.h
+libcxx/include/__algorithm/ranges_mismatch.h
+libcxx/include/__algorithm/ranges_move_backward.h
+libcxx/include/__algorithm/ranges_move.h
+libcxx/include/__algorithm/ranges_none_of.h
+libcxx/include/__algorithm/ranges_nth_element.h
+libcxx/include/__algorithm/ranges_partial_sort_copy.h
+libcxx/include/__algorithm/ranges_partial_sort.h
+libcxx/include/__algorithm/ranges_partition_copy.h
+libcxx/include/__algorithm/ranges_partition.h
+libcxx/include/__algorithm/ranges_partition_point.h
+libcxx/include/__algorithm/ranges_pop_heap.h
+libcxx/include/__algorithm/ranges_prev_permutation.h
+libcxx/include/__algorithm/ranges_push_heap.h
+libcxx/include/__algorithm/ranges_remove_copy.h
+libcxx/include/__algorithm/ranges_remove_copy_if.h
+libcxx/include/__algorithm/ranges_remove.h
+libcxx/include/__algorithm/ranges_remove_if.h
+libcxx/include/__algorithm/ranges_replace_copy.h
+libcxx/include/__algorithm/ranges_replace_copy_if.h
+libcxx/include/__algorithm/ranges_replace.h
+libcxx/include/__algorithm/ranges_replace_if.h
+libcxx/include/__algorithm/ranges_reverse_copy.h
+libcxx/include/__algorithm/ranges_reverse.h
+libcxx/include/__algorithm/ranges_rotate_copy.h
+libcxx/include/__algorithm/ranges_rotate.h
+libcxx/include/__algorithm/ranges_sample.h
+libcxx/include/__algorithm/ranges_search.h
+libcxx/include/__algorithm/ranges_search_n.h
+libcxx/include/__algorithm/ranges_set_difference.h
+libcxx/include/__algorithm/ranges_set_intersection.h
+libcxx/include/__algorithm/ranges_set_symmetric_difference.h
+libcxx/include/__algorithm/ranges_set_union.h
+libcxx/include/__algorithm/ranges_shuffle.h
+libcxx/include/__algorithm/ranges_sort.h
+libcxx/include/__algorithm/ranges_sort_heap.h
+libcxx/include/__algorithm/ranges_stable_partition.h
+libcxx/include/__algorithm/ranges_stable_sort.h
+libcxx/include/__algorithm/ranges_swap_ranges.h
+libcxx/include/__algorithm/ranges_transform.h
+libcxx/include/__algorithm/ranges_unique_copy.h
+libcxx/include/__algorithm/ranges_unique.h
+libcxx/include/__algorithm/ranges_upper_bound.h
+libcxx/include/__algorithm/remove_copy.h
+libcxx/include/__algorithm/remove_copy_if.h
+libcxx/include/__algorithm/remove.h
+libcxx/include/__algorithm/remove_if.h
+libcxx/include/__algorithm/replace_copy.h
+libcxx/include/__algorithm/replace_copy_if.h
+libcxx/include/__algorithm/replace.h
+libcxx/include/__algorithm/replace_if.h
+libcxx/include/__algorithm/reverse_copy.h
+libcxx/include/__algorithm/reverse.h
+libcxx/include/__algorithm/rotate_copy.h
+libcxx/include/__algorithm/rotate.h
+libcxx/include/__algorithm/sample.h
+libcxx/include/__algorithm/search.h
+libcxx/include/__algorithm/search_n.h
+libcxx/include/__algorithm/set_difference.h
+libcxx/include/__algorithm/shift_left.h
+libcxx/include/__algorithm/shift_right.h
+libcxx/include/__algorithm/shuffle.h
+libcxx/include/__algorithm/sift_down.h
+libcxx/include/__algorithm/sort.h
+libcxx/include/__algorithm/sort_heap.h
+libcxx/include/__algorithm/stable_partition.h
+libcxx/include/__algorithm/stable_sort.h
+libcxx/include/__algorithm/swap_ranges.h
+libcxx/include/__algorithm/transform.h
+libcxx/include/__algorithm/uniform_random_bit_generator_adaptor.h
+libcxx/include/__algorithm/unwrap_iter.h
+libcxx/include/__algorithm/unwrap_range.h
+libcxx/include/__algorithm/upper_bound.h
+libcxx/include/any
+libcxx/include/array
+libcxx/include/__atomic/atomic_base.h
+libcxx/include/__atomic/atomic_flag.h
+libcxx/include/__atomic/atomic.h
+libcxx/include/__atomic/atomic_init.h
+libcxx/include/__atomic/atomic_lock_free.h
+libcxx/include/__atomic/atomic_sync.h
+libcxx/include/__atomic/check_memory_order.h
+libcxx/include/__atomic/contention_t.h
+libcxx/include/__atomic/cxx_atomic_impl.h
+libcxx/include/__atomic/fence.h
+libcxx/include/__atomic/kill_dependency.h
+libcxx/include/__atomic/memory_order.h
+libcxx/include/__availability
+libcxx/include/barrier
+libcxx/include/__bit/bit_cast.h
+libcxx/include/__bit/bit_ceil.h
+libcxx/include/__bit/byteswap.h
+libcxx/include/__bit/countl.h
+libcxx/include/__bit/countr.h
+libcxx/include/__bit/endian.h
+libcxx/include/__bit/popcount.h
+libcxx/include/__bit_reference
+libcxx/include/__bit/rotate.h
+libcxx/include/bitset
+libcxx/include/__bsd_locale_defaults.h
+libcxx/include/__bsd_locale_fallbacks.h
+libcxx/include/cctype
+libcxx/include/chrono
+libcxx/include/__chrono/calendar.h
+libcxx/include/__chrono/convert_to_timespec.h
+libcxx/include/__chrono/day.h
+libcxx/include/__chrono/duration.h
+libcxx/include/__chrono/file_clock.h
+libcxx/include/__chrono/formatter.h
+libcxx/include/__chrono/hh_mm_ss.h
+libcxx/include/__chrono/high_resolution_clock.h
+libcxx/include/__chrono/literals.h
+libcxx/include/__chrono/monthday.h
+libcxx/include/__chrono/month.h
+libcxx/include/__chrono/month_weekday.h
+libcxx/include/__chrono/steady_clock.h
+libcxx/include/__chrono/system_clock.h
+libcxx/include/__chrono/time_point.h
+libcxx/include/__chrono/weekday.h
+libcxx/include/__chrono/year.h
+libcxx/include/__chrono/year_month_day.h
+libcxx/include/__chrono/year_month.h
+libcxx/include/__chrono/year_month_weekday.h
+libcxx/include/cmath
+libcxx/include/codecvt
+libcxx/include/__compare/common_comparison_category.h
+libcxx/include/__compare/compare_partial_order_fallback.h
+libcxx/include/__compare/compare_strong_order_fallback.h
+libcxx/include/__compare/compare_three_way.h
+libcxx/include/__compare/compare_three_way_result.h
+libcxx/include/__compare/compare_weak_order_fallback.h
+libcxx/include/__compare/ordering.h
+libcxx/include/__compare/partial_order.h
+libcxx/include/__compare/strong_order.h
+libcxx/include/__compare/three_way_comparable.h
+libcxx/include/__compare/weak_order.h
+libcxx/include/complex
+libcxx/include/__concepts/arithmetic.h
+libcxx/include/__concepts/assignable.h
+libcxx/include/__concepts/boolean_testable.h
+libcxx/include/__concepts/class_or_enum.h
+libcxx/include/__concepts/common_reference_with.h
+libcxx/include/__concepts/common_with.h
+libcxx/include/__concepts/constructible.h
+libcxx/include/__concepts/convertible_to.h
+libcxx/include/__concepts/copyable.h
+libcxx/include/__concepts/derived_from.h
+libcxx/include/__concepts/destructible.h
+libcxx/include/__concepts/different_from.h
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+libcxx/src/include/config_elast.h
+libcxx/src/include/refstring.h
+libcxx/src/include/ryu/ryu.h
+libcxx/src/include/sso_allocator.h
+libcxx/src/ios.cpp
+libcxx/src/iostream.cpp
+libcxx/src/legacy_debug_handler.cpp
+libcxx/src/locale.cpp
+libcxx/src/memory.cpp
+libcxx/src/mutex.cpp
+libcxx/src/mutex_destructor.cpp
+libcxx/src/new.cpp
+libcxx/src/optional.cpp
+libcxx/src/random.cpp
+libcxx/src/random_shuffle.cpp
+libcxx/src/regex.cpp
+libcxx/src/shared_mutex.cpp
+libcxx/src/stdexcept.cpp
+libcxx/src/std_stream.h
+libcxx/src/string.cpp
+libcxx/src/strstream.cpp
+libcxx/src/support/ibm/mbsnrtowcs.cpp
+libcxx/src/support/ibm/wcsnrtombs.cpp
+libcxx/src/support/ibm/xlocale_zos.cpp
+libcxx/src/support/runtime/exception_fallback.ipp
+libcxx/src/support/runtime/exception_glibcxx.ipp
+libcxx/src/support/runtime/exception_libcxxabi.ipp
+libcxx/src/support/runtime/exception_libcxxrt.ipp
+libcxx/src/support/runtime/exception_msvc.ipp
+libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
+libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
+libcxx/src/support/runtime/exception_pointer_msvc.ipp
+libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
+libcxx/src/support/runtime/new_handler_fallback.ipp
+libcxx/src/support/runtime/stdexcept_default.ipp
+libcxx/src/support/runtime/stdexcept_vcruntime.ipp
+libcxx/src/support/solaris/mbsnrtowcs.inc
+libcxx/src/support/solaris/wcsnrtombs.inc
+libcxx/src/support/solaris/xlocale.cpp
+libcxx/src/support/win32/locale_win32.cpp
+libcxx/src/support/win32/support.cpp
+libcxx/src/support/win32/thread_win32.cpp
+libcxx/src/system_error.cpp
+libcxx/src/thread.cpp
+libcxx/src/typeinfo.cpp
+libcxx/src/valarray.cpp
+libcxx/src/variant.cpp
+libcxx/src/vector.cpp
+libcxx/src/verbose_abort.cpp
diff --git a/third_party/llvm-project/libcxx/utils/generate_escaped_output_table.py b/third_party/llvm-project/libcxx/utils/generate_escaped_output_table.py
index cc0b1dd..09e186c 100755
--- a/third_party/llvm-project/libcxx/utils/generate_escaped_output_table.py
+++ b/third_party/llvm-project/libcxx/utils/generate_escaped_output_table.py
@@ -228,13 +228,13 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 20
+#if _LIBCPP_STD_VER >= 23
 
 namespace __escaped_output_table {{
 {content}
 }} // namespace __escaped_output_table
 
-#endif //_LIBCPP_STD_VER > 20
+#endif //_LIBCPP_STD_VER >= 23
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_table.py b/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_table.py
index 2762c01..0050998 100755
--- a/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_table.py
+++ b/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_table.py
@@ -222,13 +222,13 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
 
 namespace __extended_grapheme_custer_property_boundary {{
 {content}
 }} // namespace __extended_grapheme_custer_property_boundary
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_test.py b/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_test.py
index 5061c80..6714b22 100755
--- a/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_test.py
+++ b/third_party/llvm-project/libcxx/utils/generate_extended_grapheme_cluster_test.py
@@ -99,7 +99,7 @@
 //===----------------------------------------------------------------------===//
 
 // WARNING, this entire header is generated by
-// utiles/generate_extended_grapheme_cluster_test.py
+// utils/generate_extended_grapheme_cluster_test.py
 // DO NOT MODIFY!
 
 // UNICODE, INC. LICENSE AGREEMENT - DATA FILES AND SOFTWARE
@@ -169,7 +169,7 @@
   /// The offset of the last code units of the extended grapheme clusters in the input.
   ///
   /// The vector has the same number of entries as \\ref code_points.
-  std::vector<size_t> breaks;
+  std::vector<std::size_t> breaks;
 }};
 
 /// The data for UTF-8.
diff --git a/third_party/llvm-project/libcxx/utils/generate_feature_test_macro_components.py b/third_party/llvm-project/libcxx/utils/generate_feature_test_macro_components.py
index 69cb942..fb59395 100755
--- a/third_party/llvm-project/libcxx/utils/generate_feature_test_macro_components.py
+++ b/third_party/llvm-project/libcxx/utils/generate_feature_test_macro_components.py
@@ -48,9 +48,7 @@
 #                   just libc++. It may depend on
 #                    * macros defined by the compiler itself, or
 #                    * macros generated by CMake.
-#                   In some cases we add
-#                   `&& !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM_...)`
-#                   in order to make libc++ pass the tests on OSX; see D94983.
+#                   In some cases we add also depend on macros defined in <__availability>.
 # libcxx_guard      An optional string field. When this field is provided,
 #                   `test_suite_guard` must also be provided. This field is used
 #                   only to guard the feature-test macro in <version>. It may
@@ -138,14 +136,14 @@
     "name": "__cpp_lib_atomic_wait",
     "values": { "c++20": 201907 },
     "headers": ["atomic"],
-    "test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)",
-    "libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)",
+    "test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
+    "libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
   }, {
     "name": "__cpp_lib_barrier",
     "values": { "c++20": 201907 },
     "headers": ["barrier"],
-    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)",
-    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
   }, {
     "name": "__cpp_lib_bind_back",
     "values": { "c++2b": 202202 },
@@ -267,7 +265,6 @@
     "name": "__cpp_lib_constexpr_typeinfo",
     "values": { "c++2b": 202106 },
     "headers": ["typeinfo"],
-    "unimplemented": True,
   }, {
     "name": "__cpp_lib_constexpr_utility",
     "values": { "c++20": 201811 },
@@ -285,7 +282,7 @@
     "values": { "c++20": 201806 },
     "headers": ["new"],
     "test_suite_guard": "TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L",
-    "libcxx_guard": "_LIBCPP_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L",
+    "libcxx_guard": "_LIBCPP_STD_VER >= 20 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L",
   }, {
     "name": "__cpp_lib_enable_shared_from_this",
     "values": { "c++17": 201603 },
@@ -315,8 +312,8 @@
     "name": "__cpp_lib_filesystem",
     "values": { "c++17": 201703 },
     "headers": ["filesystem"],
-    "test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)",
-    "libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)"
+    "test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)",
+    "libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)"
   }, {
     "name": "__cpp_lib_format",
     "values": {
@@ -327,8 +324,21 @@
         # "c++23": 202207, Not implemented P2419R2 Clarify handling of encodings in localized formatting of chrono types
         },
     "headers": ["format"],
-    "test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
-    "libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+    "unimplemented": True,
+  }, {
+    "name": "__cpp_lib_format_ranges",
+    "values": { "c++2b": 202207 },
+    "headers": ["format"],
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+  }, {
+    "name": "__cpp_lib_formatters",
+    "values": { "c++2b": 202302 },
+    "headers": ["stacktrace", "thread"],
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_forward_like",
@@ -392,7 +402,6 @@
     "name": "__cpp_lib_invoke_r",
     "values": { "c++2b": 202106 },
     "headers": ["functional"],
-    "unimplemented": True,
   }, {
     "name": "__cpp_lib_is_aggregate",
     "values": { "c++17": 201703 },
@@ -446,8 +455,8 @@
     "name": "__cpp_lib_latch",
     "values": { "c++20": 201907 },
     "headers": ["latch"],
-    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)",
-    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
   }, {
     "name": "__cpp_lib_launder",
     "values": { "c++17": 201606 },
@@ -490,6 +499,10 @@
     "values": { "c++17": 201603 },
     "headers": ["memory_resource"],
   }, {
+    "name": "__cpp_lib_move_iterator_concept",
+    "values": { "c++20": 202207 },
+    "headers": ["iterator"],
+   }, {
     "name": "__cpp_lib_move_only_function",
     "values": { "c++2b": 202110 },
     "headers": ["functional"],
@@ -537,6 +550,10 @@
     "values": { "c++20": 202106 },
     "headers": ["algorithm", "functional", "iterator", "memory", "ranges"],
   }, {
+    "name": "__cpp_lib_ranges_as_rvalue",
+    "values": { "c++2b": 202207 },
+    "headers": ["ranges"],
+  }, {
     "name": "__cpp_lib_ranges_chunk",
     "values": { "c++2b": 202202 },
     "headers": ["ranges"],
@@ -609,14 +626,14 @@
     "name": "__cpp_lib_semaphore",
     "values": { "c++20": 201907 },
     "headers": ["semaphore"],
-    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)",
-    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SYNC)",
   }, {
     "name": "__cpp_lib_shared_mutex",
     "values": { "c++17": 201505 },
     "headers": ["shared_mutex"],
-    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)",
-    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)",
   }, {
     "name": "__cpp_lib_shared_ptr_arrays",
     "values": { "c++17": 201611, "c++20": 201707 },
@@ -629,8 +646,8 @@
     "name": "__cpp_lib_shared_timed_mutex",
     "values": { "c++14": 201402 },
     "headers": ["shared_mutex"],
-    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)",
-    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)",
+    "test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)",
+    "libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX)",
   }, {
     "name": "__cpp_lib_shift",
     "values": { "c++20": 201806 },
@@ -644,8 +661,8 @@
     "name": "__cpp_lib_source_location",
     "values": { "c++20": 201907 },
     "headers": ["source_location"],
-    "test_suite_guard": "__has_builtin(__builtin_source_location)",
-    "libcxx_guard": "__has_builtin(__builtin_source_location)",
+    "test_suite_guard": "__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)",
+    "libcxx_guard": "__has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)",
   }, {
     "name": "__cpp_lib_span",
     "values": { "c++20": 202002 },
@@ -875,17 +892,15 @@
   return result.strip()
 
 def produce_macros_definitions():
-  macro_definition_template = """#if _LIBCPP_STD_VER > {previous_std_number}
+  macro_definition_template = """#if _LIBCPP_STD_VER >= {std_number}
 {macro_definition}
 #endif"""
 
   macros_definitions = []
-  previous_std_number = '11'
   for std in get_std_dialects():
     macros_definitions.append(
-      macro_definition_template.format(previous_std_number=previous_std_number,
+      macro_definition_template.format(std_number=get_std_number(std).replace('2b', '23'),
                                        macro_definition=produce_macros_definition_for_std(std)))
-    previous_std_number = get_std_number(std)
 
   return '\n\n'.join(macros_definitions)
 
diff --git a/third_party/llvm-project/libcxx/utils/generate_header_tests.py b/third_party/llvm-project/libcxx/utils/generate_header_tests.py
index 2981963..f9f9ddc 100755
--- a/third_party/llvm-project/libcxx/utils/generate_header_tests.py
+++ b/third_party/llvm-project/libcxx/utils/generate_header_tests.py
@@ -43,7 +43,6 @@
     "wchar.h": "!defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)",
 
     "experimental/algorithm": "__cplusplus >= 201103L",
-    "experimental/coroutine": "__cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)",
     "experimental/deque": "__cplusplus >= 201103L",
     "experimental/forward_list": "__cplusplus >= 201103L",
     "experimental/functional": "__cplusplus >= 201103L",
diff --git a/third_party/llvm-project/libcxx/utils/generate_ignore_format.sh b/third_party/llvm-project/libcxx/utils/generate_ignore_format.sh
new file mode 100755
index 0000000..c07b76d
--- /dev/null
+++ b/third_party/llvm-project/libcxx/utils/generate_ignore_format.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Generate a list of headers that aren't formatted yet
+
+if [ -z "${CLANG_FORMAT}" ]; then
+  CLANG_FORMAT=clang-format
+fi
+
+rm libcxx/utils/data/ignore_format.txt
+# This uses the same matches as the check-format CI step.
+#
+# Since it's hard to match empty extensions the following
+# method is used, remove all files with an extension, then
+# add the list of extensions that should be formatted.
+for file in $(find libcxx/{benchmarks,include,src}/ -type f -not -name '*.*' -or \( \
+	 -name "*.h" -or -name "*.hpp" -or \
+	 -name "*.c" -or -name "*.cpp" -or \
+	 -name "*.inc" -or -name "*.ipp" \
+	 \) ); do
+
+  ${CLANG_FORMAT} --Werror --dry-run ${file} >& /dev/null
+  if [ $? != 0 ]; then
+    echo ${file} >> libcxx/utils/data/ignore_format.txt
+  fi
+done
+
+# Force sorting not to depend on the system's locale.
+LC_ALL=C sort libcxx/utils/data/ignore_format.txt -d -o libcxx/utils/data/ignore_format.txt
diff --git a/third_party/llvm-project/libcxx/utils/generate_iwyu_mapping.py b/third_party/llvm-project/libcxx/utils/generate_iwyu_mapping.py
index 1e0242b..16db78d 100644
--- a/third_party/llvm-project/libcxx/utils/generate_iwyu_mapping.py
+++ b/third_party/llvm-project/libcxx/utils/generate_iwyu_mapping.py
@@ -30,7 +30,7 @@
             c_headers.append(i.name)
 
     result = []
-    temporary_mappings = {'__tuple_dir': 'tuple'}
+    temporary_mappings = {}
     for i in detail_directories:
         public_header = temporary_mappings.get(i, i.lstrip('_'))
         result.append(f'{generate(f"@<{i}/.*>", public_header)},')
@@ -53,7 +53,6 @@
         elif i == '__mutex_base': continue
         elif i == '__node_handle': public = ['map', 'set', 'unordered_map', 'unordered_set']
         elif i == '__split_buffer': public = ['deque', 'vector']
-        elif i == '__std_stream': public = ['iostream']
         elif i == '__threading_support': public = ['atomic', 'mutex', 'semaphore', 'thread']
         elif i == '__tree': public = ['map', 'set']
         elif i == '__undef_macros': continue
diff --git a/third_party/llvm-project/libcxx/utils/libcxx/test/newconfig.py b/third_party/llvm-project/libcxx/utils/libcxx/test/config.py
similarity index 100%
rename from third_party/llvm-project/libcxx/utils/libcxx/test/newconfig.py
rename to third_party/llvm-project/libcxx/utils/libcxx/test/config.py
diff --git a/third_party/llvm-project/libcxx/utils/libcxx/test/features.py b/third_party/llvm-project/libcxx/utils/libcxx/test/features.py
index c2745b9..dd5163f 100644
--- a/third_party/llvm-project/libcxx/utils/libcxx/test/features.py
+++ b/third_party/llvm-project/libcxx/utils/libcxx/test/features.py
@@ -7,10 +7,11 @@
 #===----------------------------------------------------------------------===##
 
 from libcxx.test.dsl import *
+from lit.BooleanExpression import BooleanExpression
 import re
 import shutil
-import sys
 import subprocess
+import sys
 
 _isClang      = lambda cfg: '__clang__' in compilerMacros(cfg) and '__apple_build_version__' not in compilerMacros(cfg)
 _isAppleClang = lambda cfg: '__apple_build_version__' in compilerMacros(cfg)
@@ -35,11 +36,6 @@
     return None
 
 DEFAULT_FEATURES = [
-  Feature(name='fcoroutines-ts',
-          when=lambda cfg: hasCompileFlag(cfg, '-fcoroutines-ts') and
-                           featureTestMacros(cfg, flags='-fcoroutines-ts').get('__cpp_coroutines', 0) >= 201703,
-          actions=[AddCompileFlag('-fcoroutines-ts')]),
-
   Feature(name='thread-safety',
           when=lambda cfg: hasCompileFlag(cfg, '-Werror=thread-safety'),
           actions=[AddCompileFlag('-Werror=thread-safety')]),
@@ -244,7 +240,10 @@
 DEFAULT_FEATURES += [
   Feature(name='darwin', when=lambda cfg: '__APPLE__' in compilerMacros(cfg)),
   Feature(name='windows', when=lambda cfg: '_WIN32' in compilerMacros(cfg)),
-  Feature(name='windows-dll', when=lambda cfg: '_WIN32' in compilerMacros(cfg) and programSucceeds(cfg, """
+  Feature(name='windows-dll', when=lambda cfg: '_WIN32' in compilerMacros(cfg) and sourceBuilds(cfg, """
+            #include <iostream>
+            int main(int, char**) { return 0; }
+          """) and programSucceeds(cfg, """
             #include <iostream>
             #include <windows.h>
             #include <winnt.h>
@@ -323,3 +322,63 @@
     actions=[AddSubstitution('%{gdb}', lambda cfg: shutil.which('gdb'))]
   )
 ]
+
+# Define features for back-deployment testing.
+#
+# These features can be used to XFAIL tests that fail when deployed on (or compiled
+# for) an older system. For example, if a test exhibits a bug in the libc on a
+# particular system version, or if it uses a symbol that is not available on an
+# older version of the dylib, it can be marked as XFAIL with these features.
+#
+# It is sometimes useful to check that a test fails specifically when compiled for a
+# given deployment target. For example, this is the case when testing availability
+# markup, where we want to make sure that using the annotated facility on a deployment
+# target that doesn't support it will fail at compile time, not at runtime. This can
+# be achieved by creating a `.verify.cpp` test that checks for the right errors, and
+# mark that test as requiring `stdlib=<vendor>-libc++ && target=<target>`.
+DEFAULT_FEATURES += [
+  # Tests that require std::to_chars(floating-point) in the built library
+  Feature(name='availability-fp_to_chars-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx{{(10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0|13.0)(.0)?}}', cfg.available_features)),
+
+  # Tests that require https://wg21.link/P0482 support in the built library
+  Feature(name='availability-char8_t_support-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx{{(10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0)(.0)?}}', cfg.available_features)),
+
+  # Tests that require __libcpp_verbose_abort support in the built library
+  Feature(name='availability-verbose_abort-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx{{(10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0|13.0)(.0)?}}', cfg.available_features)),
+
+  # Tests that require std::bad_variant_access in the built library
+  Feature(name='availability-bad_variant_access-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12)(.0)?}}', cfg.available_features)),
+
+  # Tests that require std::bad_optional_access in the built library
+  Feature(name='availability-bad_optional_access-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12)(.0)?}}', cfg.available_features)),
+
+  # Tests that require std::bad_any_cast in the built library
+  Feature(name='availability-bad_any_cast-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12)(.0)?}}', cfg.available_features)),
+
+  # Tests that require std::pmr support in the built library
+  Feature(name='availability-pmr-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx{{(10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0)(.0)?}}', cfg.available_features)),
+
+  # Tests that require std::filesystem support in the built library
+  Feature(name='availability-filesystem-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12|13|14)(.0)?}}', cfg.available_features)),
+
+  # Tests that require the C++20 synchronization library (P1135R6 implemented by https://llvm.org/D68480) in the built library
+  Feature(name='availability-synchronization_library-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12|13|14|15)(.0)?}}', cfg.available_features)),
+
+  # Tests that require support for std::shared_mutex and std::shared_timed_mutex in the built library
+  Feature(name='availability-shared_mutex-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11)(.0)?}}', cfg.available_features)),
+
+  # Tests that require support for aligned allocation in the built library. This is about `operator new(..., std::align_val_t, ...)` specifically,
+  # not other forms of aligned allocation.
+  Feature(name='availability-aligned_allocation-missing',
+    when=lambda cfg: BooleanExpression.evaluate('stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{(9|10|11|12)(.0)?}}', cfg.available_features)),
+]
diff --git a/third_party/llvm-project/libcxx/utils/libcxx/test/format.py b/third_party/llvm-project/libcxx/utils/libcxx/test/format.py
index 6860f8d..4d3466d 100644
--- a/third_party/llvm-project/libcxx/utils/libcxx/test/format.py
+++ b/third_party/llvm-project/libcxx/utils/libcxx/test/format.py
@@ -115,9 +115,11 @@
     FOO.pass.mm             - Same as .pass.cpp, but for Objective-C++
 
     FOO.compile.pass.cpp    - Compiles successfully, link and run not attempted
+    FOO.compile.pass.mm     - Same as .compile.pass.cpp, but for Objective-C++
     FOO.compile.fail.cpp    - Does not compile successfully
 
     FOO.link.pass.cpp       - Compiles and links successfully, run not attempted
+    FOO.link.pass.mm        - Same as .link.pass.cpp, but for Objective-C++
     FOO.link.fail.cpp       - Compiles successfully, but fails to link
 
     FOO.sh.<anything>       - A builtin Lit Shell test
@@ -187,8 +189,10 @@
     """
     def getTestsInDirectory(self, testSuite, pathInSuite, litConfig, localConfig):
         SUPPORTED_SUFFIXES = ['[.]pass[.]cpp$', '[.]pass[.]mm$',
-                              '[.]compile[.]pass[.]cpp$', '[.]compile[.]fail[.]cpp$',
-                              '[.]link[.]pass[.]cpp$', '[.]link[.]fail[.]cpp$',
+                              '[.]compile[.]pass[.]cpp$', '[.]compile[.]pass[.]mm$',
+                              '[.]compile[.]fail[.]cpp$',
+                              '[.]link[.]pass[.]cpp$', '[.]link[.]pass[.]mm$',
+                              '[.]link[.]fail[.]cpp$',
                               '[.]sh[.][^.]+$',
                               '[.]verify[.]cpp$',
                               '[.]fail[.]cpp$']
@@ -211,7 +215,7 @@
         if re.search('[.]sh[.][^.]+$', filename):
             steps = [ ] # The steps are already in the script
             return self._executeShTest(test, litConfig, steps)
-        elif filename.endswith('.compile.pass.cpp'):
+        elif filename.endswith('.compile.pass.cpp') or filename.endswith('.compile.pass.mm'):
             steps = [
                 "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} -fsyntax-only"
             ]
@@ -221,7 +225,7 @@
                 "%dbg(COMPILED WITH) ! %{cxx} %s %{flags} %{compile_flags} -fsyntax-only"
             ]
             return self._executeShTest(test, litConfig, steps)
-        elif filename.endswith('.link.pass.cpp'):
+        elif filename.endswith('.link.pass.cpp') or filename.endswith('.link.pass.mm'):
             steps = [
                 "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe"
             ]
@@ -266,11 +270,6 @@
         else:
             return lit.Test.Result(lit.Test.UNRESOLVED, "Unknown test suffix for '{}'".format(filename))
 
-    # Utility function to add compile flags in lit.local.cfg files.
-    def addCompileFlags(self, config, *flags):
-        string = ' '.join(flags)
-        config.substitutions = [(s, x + ' ' + string) if s == '%{compile_flags}' else (s, x) for (s, x) in config.substitutions]
-
     def _executeShTest(self, test, litConfig, steps):
         if test.config.unsupported:
             return lit.Test.Result(lit.Test.UNSUPPORTED, 'Test is unsupported')
diff --git a/third_party/llvm-project/libcxx/utils/libcxx/test/params.py b/third_party/llvm-project/libcxx/utils/libcxx/test/params.py
index 74a4ec2..3d0addb 100644
--- a/third_party/llvm-project/libcxx/utils/libcxx/test/params.py
+++ b/third_party/llvm-project/libcxx/utils/libcxx/test/params.py
@@ -17,6 +17,7 @@
   '-Wextra',
   '-Wshadow',
   '-Wundef',
+  '-Wunused-template',
   '-Wno-unused-command-line-argument',
   '-Wno-attributes',
   '-Wno-pessimizing-move',
@@ -94,6 +95,12 @@
               AddCompileFlag('-fcxx-modules'), # AppleClang disregards -fmodules entirely when compiling C++. This enables modules for C++.
             ] if modules else []),
 
+  Parameter(name='enable_modules_lsv', choices=[True, False], type=bool, default=False,
+          help="Whether to enable Local Submodule Visibility in the Modules build.",
+          actions=lambda lsv: [
+            AddCompileFlag('-Xclang -fmodules-local-submodule-visibility'),
+          ] if lsv else []),
+
   Parameter(name='enable_exceptions', choices=[True, False], type=bool, default=True,
             help="Whether to enable exceptions when compiling the test suite.",
             actions=lambda exceptions: [] if exceptions else [
@@ -118,8 +125,8 @@
                  The Standard libraries currently supported are:
                  - llvm-libc++: The 'upstream' libc++ as shipped with LLVM.
                  - apple-libc++: libc++ as shipped by Apple. This is basically like the LLVM one, but
-                                 there are a few differences like installation paths and the use of
-                                 universal dylibs.
+                                 there are a few differences like installation paths, the use of
+                                 universal dylibs and the existence of availability markup.
                  - libstdc++: The GNU C++ library typically shipped with GCC.
                  - msvc: The Microsoft implementation of the C++ Standard Library.
                 """,
@@ -208,38 +215,3 @@
               AddCompileFlag('-D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES')
             ]),
 ]
-
-DEFAULT_PARAMETERS += [
-  Parameter(name='use_system_cxx_lib', choices=[True, False], type=bool, default=False,
-            help="""
-    Whether the test suite is being *run* against the library shipped on the
-    target triple in use, as opposed to the trunk library.
-
-    When vendor-specific availability annotations are enabled, we add the
-    'use_system_cxx_lib' Lit feature to allow writing XFAIL or UNSUPPORTED
-    markup for tests that are known to fail on a particular triple.
-
-    That feature can be used to XFAIL a test that fails when deployed on (or is
-    compiled for) an older system. For example, if the test exhibits a bug in the
-    libc on a particular system version, or if the test uses a symbol that is not
-    available on an older version of the dylib, it can be marked as XFAIL with
-    the above feature.
-
-    It is sometimes useful to check that a test fails specifically when compiled
-    for a given deployment target. For example, this is the case when testing
-    availability markup, where we want to make sure that using the annotated
-    facility on a deployment target that doesn't support it will fail at compile
-    time, not at runtime. This can be achieved by creating a `.compile.pass.cpp`
-    and XFAILing it for the right deployment target. If the test doesn't fail at
-    compile-time like it's supposed to, the test will XPASS. Another option is to
-    create a `.verify.cpp` test that checks for the right errors, and mark that
-    test as requiring `use_system_cxx_lib && <target>`.
-    """,
-    actions=lambda useSystem: [
-      AddFeature('use_system_cxx_lib')
-    ] if useSystem else [
-      # If we're testing upstream libc++, disable availability markup,
-      # which is not relevant for non-shipped flavors of libc++.
-      AddCompileFlag('-D_LIBCPP_DISABLE_AVAILABILITY')
-    ])
-]