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[3.12] gh-115165: Fix typing.Annotated for immutable types (GH-115213) (#115227)

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gh-115165: Fix `typing.Annotated` for immutable types (GH-115213)

The return value from an annotated callable can raise any exception from
__setattr__ for the `__orig_class__` property.
(cherry picked from commit 564385612c)

Co-authored-by: dave-shawley <daveshawley@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-02-09 23:31:57 +01:00 • committed by GitHub
parent 3539b02873
commit 321ec5e0fe
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3 changed files with 28 additions and 1 deletions
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4
Lib/typing.py
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@ -1140,7 +1140,9 @@ class _BaseGenericAlias(_Final, _root=True):
result = self.__origin__(*args, **kwargs)
try:
result.__orig_class__ = self
except AttributeError:
# Some objects raise TypeError (or something even more exotic)
# if you try to set attributes on them; we guard against that here
except Exception:
pass
return result