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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.
//
//===----------------------------------------------------------------------===//
// REQUIRES: thread-safety
// <mutex>
#define _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS
#include <mutex>
std::mutex m;
int main() {
m.lock();
} // expected-error {{mutex 'm' is still held at the end of function}}