1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <new>
11 
12 // template <class T> constexpr T* launder(T* p) noexcept;
13 
14 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
15 // REQUIRES: verify-support
16 
17 #include <new>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 int main(int, char**)
23 {
24     int *p = nullptr;
25     std::launder(p); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
26 
27     return 0;
28 }
29