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Incorrect inference for types with __eq__ and no __hash__ #18622
Description
problem
class A:
def __eq__(self, o: object, /) -> bool:
return self is o
reveal_type(A().__hash__) # def () -> builtins.intyet
>>> class A:
... def __eq__(self, o: object, /) -> bool:
... return self is o
...
>>> type(A.__hash__)
<class 'NoneType'>solution
iff. class A, and only class A (i.e. excluding any base classes)
- implements
__eq__, and - does not implement
__hash__
infer A.__hash__: ClassVar[None]
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