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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.
//
//===----------------------------------------------------------------------===//
// <mutex>
// template <class Mutex> class lock_guard;
// lock_guard(lock_guard const&) = delete;
#include <mutex>
int main()
{
std::mutex m;
std::lock_guard<std::mutex> lg0(m);
std::lock_guard<std::mutex> lg(lg0);
}