Define generics from a different function

jedi/evaluate/context/instance.py

@@ -279,8 +279,7 @@ class TreeInstance(AbstractInstanceContext):
                 continue
 
             all_annotations = pep0484.py__annotations__(execution.tree_node)
-            defined = pep0484.define_type_vars(
-                self.class_context,
+            defined = self.class_context.define_generics(
                 pep0484.infer_type_vars_for_execution(execution, all_annotations),
             )
             debug.dbg('Inferred instance context as %s', defined, color='BLUE')