Patch typing.py to let _py_abc fallback

youknowone · youknowone · commit 224380416288 · 2025-06-30T23:46:54.000+09:00
diff --git a/Lib/typing.py b/Lib/typing.py
@@ -1987,7 +1987,8 @@ def _allow_reckless_class_checks(depth=2):
     The abc and functools modules indiscriminately call isinstance() and
     issubclass() on the whole MRO of a user class, which may contain protocols.
     """
-    return _caller(depth) in {'abc', 'functools', None}
+    # XXX: RUSTPYTHON; https://github.com/python/cpython/pull/136115
+    return _caller(depth) in {'abc', '_py_abc', 'functools', None}
 
 
 _PROTO_ALLOWLIST = {
