From 8d8dd804e34416cfdb5f70dffb7edbb21bb1246a Mon Sep 17 00:00:00 2001
From: dr-carlos <dr_steven_carlos@outlook.com>
Date: Thu, 13 Aug 2026 18:39:45 +0930
Subject: [PATCH] Test `get_annotations()` on wrapped cyclical
 `functools.partial`

---
 Lib/test/test_annotationlib.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Lib/test/test_annotationlib.py b/Lib/test/test_annotationlib.py
index 5087c3ca425f1fc..b86b94d5b5c87dd 100644
--- a/Lib/test/test_annotationlib.py
+++ b/Lib/test/test_annotationlib.py
@@ -654,6 +654,13 @@ def f(x: 'int') -> 'str': ...
         result = get_annotations(f, eval_str=True)
         self.assertEqual(result, {'x': int, 'return': str})
 
+    def test_eval_str_wrapped_partial_cycle_self(self):
+        def f(x: 'int') -> 'str': ...
+        f.__wrapped__ = functools.partial(f, 0)
+        # Cycle is detected and broken; globals from f itself are used.
+        result = get_annotations(f, eval_str=True)
+        self.assertEqual(result, {'x': int, 'return': str})
+
     def test_eval_str_wrapped_cycle_mutual(self):
         # gh-146556: mutual __wrapped__ cycle (a -> b -> a) must not hang.
         def a(x: 'int'): ...