1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // The LLVM Compiler Infrastructure
5 //
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
10
11 // <new>
12
13 // template <class T> constexpr T* launder(T* p) noexcept;
14
15 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
16 // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
17
18 #include <new>
19 #include <cassert>
20
21 #include "test_macros.h"
22
main()23 int main ()
24 {
25 int *p = nullptr;
26 std::launder(p); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
27 }
28