Rename shadowed variable in libstdc++ test.

	* testsuite/30_threads/timed_mutex/try_lock_until/57641.cc: Rename
	shadowed variable.

From-SVN: r227519

libstdc++-v3/ChangeLog

 2015-09-07  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/30_threads/timed_mutex/try_lock_until/57641.cc: Rename
+	shadowed variable.
+
 	* testsuite/30_threads/recursive_timed_mutex/unlock/2.cc: Run on
 	darwin.
 	* testsuite/30_threads/timed_mutex/unlock/2.cc: Run on darwin.

libstdc++-v3/testsuite/30_threads/timed_mutex/try_lock_until/57641.cc

@@ -48,21 +48,21 @@ struct clock
 };
 
 std::timed_mutex mx;
-bool test = false;
+bool locked = false;
 
 void f()
 {
-  test = mx.try_lock_until(clock::now() + C::milliseconds(1));
+  locked = mx.try_lock_until(clock::now() + C::milliseconds(1));
 }
 
 int main()
 {
-  bool test = false;
+  bool test __attribute__((unused)) = true;
   std::lock_guard<std::timed_mutex> l(mx);
   auto start = C::system_clock::now();
   std::thread t(f);
   t.join();
   auto stop = C::system_clock::now();
   VERIFY( (stop - start) < C::seconds(9) );
-  VERIFY( !test );
+  VERIFY( !locked );
 }