fix-missing-args

Darshan808 · Darshan808 · commit a0f72a0946c6 · 2025-10-22T23:43:44.000+05:45
diff --git a/IPython/core/guarded_eval.py b/IPython/core/guarded_eval.py
@@ -700,7 +700,9 @@ def eval_node(node: Union[ast.AST, None], context: EvaluationContext):
 
         if func_context.class_transients is not None:
             if not is_static and not is_classmethod:
-                func_context.instance_arg_name = node.args.args[0].arg
+                func_context.instance_arg_name = (
+                    node.args.args[0].arg if node.args.args else None
+                )
 
         return_type = eval_node(node.returns, context=context)
 
diff --git a/tests/test_completer.py b/tests/test_completer.py
@@ -2240,6 +2240,18 @@ def _(expected):
             ),
             "append",
         ],
+        [
+            "\n".join(
+                [
+                    "class NotYetDefined:",
+                    "    def test():",
+                    "        return []",
+                    "instance = NotYetDefined()",
+                    "instance.test().",
+                ]
+            ),
+            "append",
+        ],
         [
             "\n".join(
                 [
