[issue40397] Refactor typing._GenericAlias

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Even simpler: Dict[T, List[int]][str].

Dict[T, list[int]][str] also fails. But dict[T, list[int]][str] works as expected (and there are tests).

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<https://bugs.python.org/issue40397>
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