8000 "Overloaded function implementation does not accept all possible arguments" · Issue #11391 · python/mypy · GitHub
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"Overloaded function implementation does not accept all possible arguments" #11391

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9999years opened this issue Oct 26, 2021 · 0 comments
Open

"Overloaded function implementation does not accept all possible arguments" #11391

9999years opened this issue Oct 26, 2021 · 0 comments
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bug mypy got something wrong topic-overloads

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@9999years
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9999years commented Oct 26, 2021 •
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False positive; mypy doesn't believe that Foo[T] is a subtype of T.

from typing import Union, Generic, TypeVar, overload

T = TypeVar("T")

class Foo(Generic[T]):
    pass

@overload
def expect(pattern: Foo[T]) -> None: ...

@overload
def expect(pattern: T) -> None: ...

def expect(pattern: Union[Foo[T], T]) -> None: return None
$ mypy xxx.py
xxx.py:14: error: Overloaded function implementation does not accept all possible arguments of signature 1

Note that the second overload referencing the type variable used in the first overload is necessary; if pattern: int is used instead of pattern: T in the second overload, mypy type-checks the file correctly.

Environment

  • Mypy version used: 0.910
  • Python version used: 3.10 and 3.7
  • Operating system and version: Fedora 34

Related issues

I think that #10390 fixes this issue, but I'm not sure.
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@JelleZijlstra @9999years
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