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gh-118168: Fix Unpack interaction with builtin aliases (#118169)

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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Jelle Zijlstra 2024-04-23 06:40:26 -07:00 • committed by GitHub
parent d687d3fcfa
commit d0b664ee06
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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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@ -1786,8 +1786,9 @@ 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