exclude local Python classes from method call optimisation (even with...

exclude local Python classes from method call optimisation (even with metaclasses in place, they are fairly unlikely to return methods)

Cython/Compiler/Optimize.py

@@ -3774,9 +3774,10 @@ class FinalOptimizePhase(Visitor.CythonTransform, Visitor.NodeRefCleanupMixin):
                     if function.entry.is_builtin:
                         may_be_a_method = False
                     elif function.cf_state:
-                        # local functions are definitely not methods
+                        # local functions/classes are definitely not methods
+                        non_method_nodes = (ExprNodes.PyCFunctionNode, ExprNodes.ClassNode, ExprNodes.Py3ClassNode)
                         may_be_a_method = any(
-                            assignment.rhs and not isinstance(assignment.rhs, ExprNodes.PyCFunctionNode)
+                            assignment.rhs and not isinstance(assignment.rhs, non_method_nodes)
                             for assignment in function.cf_state)
                 if may_be_a_method:
                     node = self.replace(node, ExprNodes.PyMethodCallNode.from_node(