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 // <string>
10
11 // class deque
12
13 // bool empty() const noexcept; // constexpr since C++20
14
15 // UNSUPPORTED: c++03, c++11, c++14, c++17
16
17 #include <string>
18
f()19 void f() {
20 std::string c;
21 c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
22 }
23