Ensure subtyping works with erased typevartuples in callables#18408
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A5rocks wants to merge 1 commit intopython:masterfrom
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Ensure subtyping works with erased typevartuples in callables#18408A5rocks wants to merge 1 commit intopython:masterfrom
A5rocks wants to merge 1 commit intopython:masterfrom
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
A5rocks
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Jan 2, 2025
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| if ( | ||
| right.arg_kinds == [ARG_STAR] | ||
| and isinstance(get_proper_type(right.arg_types[0]), AnyType) |
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I'm pretty sure this check is redundant. It would require updating above to just handle *args: Any and handling tuple[Any, ...] here:
Lines 2164 to 2168 in e05770d
I'm just not sure because the comment says the form isn't constructed by mypy but it's the constructed form of any erased typevartuple? I also don't like treating any given *args: Any as finite length, but I think that ship has sailed.
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Fixes #18407
Ironically this is logic directly taken from my other PR #17512. I present this as a seperate PR because now I have a test case for the easier logic -- I'm not pleased with the rest and I think it can be done better (once I have time to think about how to work with constraint logic for a more general solution).
The reason behind these subtyping changes are to allow this subtyping check to pass:
mypy/mypy/constraints.py
Lines 424 to 427 in e05770d
After this, everything works as is typical. I'm pretty sure the reason this passes without the union is because constraints with a callable template don't check subtyping.