remove a custom implementation of std::is_reference
diff --git a/googlemock/include/gmock/gmock-more-actions.h b/googlemock/include/gmock/gmock-more-actions.h
index a052495..d42484a 100644
--- a/googlemock/include/gmock/gmock-more-actions.h
+++ b/googlemock/include/gmock/gmock-more-actions.h
@@ -105,7 +105,7 @@
// Ensures that argument #k is a reference. If you get a compiler
// error on the next line, you are using SetArgReferee<k>(value) in
// a mock function whose k-th (0-based) argument is not a reference.
- GTEST_COMPILE_ASSERT_(internal::is_reference<argk_type>::value,
+ GTEST_COMPILE_ASSERT_(std::is_reference<argk_type>::value,
SetArgReferee_must_be_used_with_a_reference_argument);
::std::get<k>(args) = value;
}