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gh-98852: Fix subscription of type aliases (GH-98920)

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Fix subscription of type aliases containing bare generic types or types
like TypeVar: for example tuple[A, T][int] and tuple[TypeVar, T][int],
where A is a generic type, and T is a type variable.
(cherry picked from commit 0e15c31c7e)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2022-11-01 01:01:28 -07:00 • committed by GitHub
parent 217a317425
commit 20c258c692
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4 changed files with 43 additions and 0 deletions
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4
Lib/typing.py
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@ -1425,6 +1425,10 @@ def _determine_new_args(self, args):
new_args = []
for old_arg in self.__args__:
if isinstance(old_arg, type):
new_args.append(old_arg)
continue
substfunc = getattr(old_arg, '__typing_subst__', None)
if substfunc:
new_arg = substfunc(new_arg_by_param[old_arg])