--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libstdc++-v3/testsuite/30_threads/unique_lock/cons/1.cc	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,52 @@
+// { dg-do run }
+// { dg-options "-pthread"  }
+// { dg-require-effective-target c++11 }
+// { dg-require-effective-target pthread }
+// { dg-require-cstdint "" }
+// { dg-require-gthreads "" }
+
+// Copyright (C) 2008-2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+#include <mutex>
+#include <system_error>
+#include <testsuite_hooks.h>
+
+int main()
+{
+  typedef std::mutex mutex_type;
+  typedef std::unique_lock<mutex_type> lock_type;
+
+  try 
+    {
+      lock_type lock;
+
+      VERIFY( !lock.owns_lock() );
+      VERIFY( !(bool)lock );
+    }
+  catch (const std::system_error& e)
+    {
+      VERIFY( false );
+    }
+  catch (...)
+    {
+      VERIFY( false );
+    }
+
+  return 0;
+}