third_party/llvm-project/libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.verify.cpp

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

// <new>

// template <class T> constexpr T* launder(T* p) noexcept;

// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: c++17 && !stdlib=libc++

#include <new>

void f() {
    int *p = nullptr;
    std::launder(p); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
}