//===----------------------------------------------------------------------===//
//
// 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

// <memory>

// allocator:
// T* allocate(size_t n, const void* hint);

//  In C++20, parts of std::allocator<T> have been removed.
//  However, for backwards compatibility, if _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS
//  is defined before including <memory>, then removed members will be restored.

// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS

#include <memory>

void f() {
    std::allocator<int> a;
    a.allocate(3, nullptr); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
}