Add regression test cases #17869
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Add regression test cases #17869
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| # https://github.com/python/mypy/issues/17864 | ||
| def f(x: str | int) -> None: | ||
| if x == "x": | ||
| reveal_type(x) # N: Revealed type is "Union[builtins.str, builtins.int]" |
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Is this desired behavior? I feel like we should narrow to Literal["x"]. Yes, it might be a subclass of int that compares equal with str, but don't do that.
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Yeah, this case seems fine. But classes that compare equal to int are not unusual (e.g. Decimal), so it's not clear where to draw the line. We might need some ad-hoc rules to support common use cases.
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The last time I tried that change IIRC it looked pretty good on primer, I think the main obstacle was it exposed some shortcomings in the binder
JelleZijlstra
approved these changes
Oct 2, 2024
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#17864