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 // template <class Mutex> class lock_guard;
14 
15 // explicit lock_guard(mutex_type& m);
16 
17 #include <mutex>
18 
19 int main(int, char**)
20 {
21     std::mutex m;
22     std::lock_guard<std::mutex> lg = m; // expected-error{{no viable conversion}}
23 
24   return 0;
25 }
26