1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <stack> 10 11 // class stack 12 13 // bool empty() const noexcept; 14 15 // UNSUPPORTED: c++03, c++11, c++14, c++17 16 17 #include <stack> 18 19 #include "test_macros.h" 20 21 int main(int, char**) 22 { 23 std::stack<int> c; 24 c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 25 26 return 0; 27 } 28