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(馃悶) TypeGuard passed to a TypeVar becomes Any, not bool #17117

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KotlinIsland opened this issue Apr 11, 2024 · 0 comments 路 May be fixed by #17145
Open

(馃悶) TypeGuard passed to a TypeVar becomes Any, not bool #17117

KotlinIsland opened this issue Apr 11, 2024 · 0 comments 路 May be fixed by #17145
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bug mypy got something wrong

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KotlinIsland commented Apr 11, 2024 •
edited

topic-typeguard TypeGuard / PEP 647 topic-type-variables 

from typing import TypeGuard, TypeVar, Callable

T = TypeVar("T")

def guard(x: object) -> TypeGuard[str]:
    return True

def f(fn: Callable[[object], T]) -> T:
    return fn(1)

reveal_type(f(guard))  # Any

This should be bool, not Any
@KotlinIsland KotlinIsland added the bug mypy got something wrong label Apr 11, 2024
@sloboegen sloboegen linked a pull request Apr 20, 2024 that will close this issue
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fix: TypeGuard becomes bool instead of Any when passed as TypeVar (fixes #17117) sloboegen/mypy
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