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 // <unordered_set>
11
12 // class unordered_set
13
14 // bool empty() const noexcept;
15
16 // UNSUPPORTED: c++03, c++11, c++14, c++17
17
18 #include <unordered_set>
19
20 #include "test_macros.h"
21
main(int,char **)22 int main(int, char**)
23 {
24 std::unordered_set<int> c;
25 c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
26
27 return 0;
28 }
29