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 // UNSUPPORTED: no-threads
10 
11 // <mutex>
12 
13 // struct once_flag;
14 
15 // once_flag(const once_flag&) = delete;
16 
17 #include <mutex>
18 
19 int main(int, char**)
20 {
21     std::once_flag f;
22     std::once_flag f2(f);
23 
24   return 0;
25 }
26