1 files changed, 10 insertions, 0 deletions
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
index a15405fcd98b..fffd087ee877 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
@@ -15,11 +15,16 @@
 
 // explicit lock_guard(mutex_type& m);
 
+// template<class _Mutex> lock_guard(lock_guard<_Mutex>)
+//     -> lock_guard<_Mutex>;  // C++17
+
 #include <mutex>
 #include <thread>
 #include <cstdlib>
 #include <cassert>
 
+#include "test_macros.h"
+
 std::mutex m;
 
 typedef std::chrono::system_clock Clock;
@@ -47,4 +52,9 @@ int main()
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+    
+#ifdef __cpp_deduction_guides
+    std::lock_guard lg(m);
+    static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
+#endif
 }