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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: libcpp-has-no-threads
// <mutex>
// template <class Mutex> class lock_guard;
// explicit lock_guard(mutex_type& m);
#include <mutex>
int main()
{
std::mutex m;
std::lock_guard<std::mutex> lg = m; // expected-error{{no viable conversion}}
}
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