From 4cb13a6ac575282a10b5ad48d885cfd78b7977c5 Mon Sep 17 00:00:00 2001
From: javulticat <31746850+javulticat@users.noreply.github.com>
Date: Tue, 17 Nov 2020 02:24:59 -0500
Subject: [PATCH] AttributeError exception in copy_method_to_another_class
 (#531)

* Fix for method_node having no arguments

* Trim whitespace
---
 mypy_django_plugin/lib/helpers.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mypy_django_plugin/lib/helpers.py b/mypy_django_plugin/lib/helpers.py
index 8b7b80f..e13b0ec 100644
--- a/mypy_django_plugin/lib/helpers.py
+++ b/mypy_django_plugin/lib/helpers.py
@@ -361,8 +361,13 @@ def copy_method_to_another_class(
     if isinstance(bound_return_type, PlaceholderNode):
         return
 
+    try:
+        original_arguments = method_node.arguments[1:]
+    except AttributeError:
+        original_arguments = []
+
     for arg_name, arg_type, original_argument in zip(
-        method_type.arg_names[1:], method_type.arg_types[1:], method_node.arguments[1:]
+        method_type.arg_names[1:], method_type.arg_types[1:], original_arguments
     ):
         bound_arg_type = semanal_api.anal_type(arg_type, allow_placeholder=True)
         if bound_arg_type is None and not semanal_api.final_iteration: