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