pyloxi: raise an exception when unimplemented
diff --git a/py_gen/tests/of13.py b/py_gen/tests/of13.py
index 76231fa..5689a94 100644
--- a/py_gen/tests/of13.py
+++ b/py_gen/tests/of13.py
@@ -142,6 +142,7 @@
             ofp.message.group_mod,
             ofp.message.group_stats_reply,
             ofp.message.meter_stats_reply,
+            ofp.message.meter_features_stats_reply,
             ofp.message.table_features_stats_reply,
             ofp.message.table_features_stats_request,
         ]