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[3.12] gh-118168: Fix Unpack interaction with builtin aliases (GH-118169) (#118178)

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Miss Islington (bot) 2024-04-23 15:57:36 +02:00 • committed by GitHub
parent fbe29e639d
commit 30e25d4ff9
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3 changed files with 39 additions and 2 deletions
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5
Lib/typing.py
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@ -1704,8 +1704,9 @@ class _UnpackGenericAlias(_GenericAlias, _root=True):
assert self.__origin__ is Unpack
assert len(self.__args__) == 1
arg, = self.__args__
if isinstance(arg, _GenericAlias):
assert arg.__origin__ is tuple
if isinstance(arg, (_GenericAlias, types.GenericAlias)):
if arg.__origin__ is not tuple:
raise TypeError("Unpack[...] must be used with a tuple type")
return arg.__args__
return None