False attr-defined error when dataclass property mirrors initvar

[joshuafishman]

Bug Report

#12046 describes one false positive in this case. However, any time the mirrored attribute is referenced also raises a false positive attribute error. Short of ignoring every reference to the offending attribute, I don't see a workaround.

To Reproduce

from dataclasses import dataclass, InitVar


@dataclass
class Baz:
    foo: InitVar[int]

    @property  # type: ignore
    def foo(self) -> int:
        return 0


print(Baz(0).foo)

Actual Behavior

error: "Baz" has no attribute "foo" [attr-defined]

Your Environment

• Mypy version used: 0.910
• Python version used: 3.9
• Operating system and version: Ubuntu 20.04

[AlexWaygood]

Duplicate of #12046

[AlexWaygood]

Duplicate of #12046

Please add your additional details to the existing bug report — it's the same bug being exhibited here, just a slightly different symptom.