gh-141174: Test `get_annotations()` on wrapped cyclical `functools.partial` (#155663)

https://github.com/python/cpython/commit/5d3f02a5c339f03fc377bacd40a83eb9217ffddb
commit: 5d3f02a5c339f03fc377bacd40a83eb9217ffddb
branch: main
author: dr-carlos <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-08-13T14:17:21Z
summary:

gh-141174: Test `get_annotations()` on wrapped cyclical `functools.partial` (#155663)

Test `get_annotations()` on wrapped cyclical `functools.partial`

files:
M Lib/test/test_annotationlib.py

diff --git a/Lib/test/test_annotationlib.py b/Lib/test/test_annotationlib.py
index 5bfcf5ce4131e3..23d31b05efea2a 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'): ...

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