gh-89547: Add support for nesting special forms like Final #116092
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Hmm, for CLA it's probably easier if I close and remake the PR with email of this account. That's my work email, which has a github account, but it's github enterprise account and unsure how to sign with it. |
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Resolves this issue. The main goal was to permit
ClassVar[Final[int]]andFinal[ClassVar[int]]. This drops validation check that Final/ClassVar argument is not a special form.This does allow some silly cases like
ClassVar[ClassVar[int]]but I think it's simpler to allow them then have more complex validation rules at runtime. I did not remove special form check for other forms soUnion[ClassVar[int], int]remains forbidden andlist[ClassVar[int]]is also forbidden. There already was a test case thatlist[ClassVar[int]]fails.I also added couple tests for Annotated to ensure it can nest freely with
ClassVar/Final.