minor

src/optimization/dce.ml

@@ -115,6 +115,7 @@ let rec check_feature dce s =
 
 and check_and_add_feature dce s =
 	check_feature dce s;
+	(* assert (dce.curclass != null_class); *)
 	Hashtbl.replace dce.curclass.cl_module.m_extra.m_features s true
 
 (* mark a field as kept *)