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Intersections with @final types should result in Never #451

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DetachHead opened this issue Apr 26, 2023 · 3 comments · May be fixed by #530
Open

Intersections with @final types should result in Never #451

DetachHead opened this issue Apr 26, 2023 · 3 comments · May be fixed by #530
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topic-intersection

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@DetachHead
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DetachHead commented Apr 26, 2023 •
edited by KotlinIsland
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@final
class A: pass
class B: pass

x: A & B
reveal_type(x)  # Never
@KotlinIsland
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  • Upstream issue #15148

@zmievsa
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zmievsa commented Apr 29, 2023 •
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Note that this proposal wouldn't necessarily affect protocols (because you do not need to inherit from it) and ABCs with overriden isinstance and issubclass hooks. Also, this feels like low priority given that mypy has the same problem already.

@KotlinIsland
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KotlinIsland commented Apr 29, 2023 •
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How would this be affected with customized metaclass/__instancecheck__. Hmm, probably the exact same as everything currently is.

@KotlinIsland KotlinIsland linked a pull request Oct 9, 2023 that will close this issue
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intersections become never KotlinIsland/basedmypy
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@zmievsa @DetachHead @KotlinIsland