Shared via mypy Playground

main.py

from typing import Never, Self, overload
from warnings import deprecated

class MyClass:
    def __init__(self: Self, x: int):
        self.x = x

    @overload
    def __eq__(self, other: Self) -> bool: ...
    
    @overload
    @deprecated('foo')
    def __eq__(self, other: object) -> bool: ...

    def __eq__(self, other: object) -> bool: ...

reveal_type(MyClass(5) == 5)  # ❌ I want mypy to give an error here