Found a strange bug today: https://mypy-play.net/?mypy=master&python=3.11&gist=5069b99b248041428036a717e52a3476

from pandas import DataFrame, Series
from typing import TypeVar

T = TypeVar("T", Series, DataFrame)

def f(x: T) -> None:
    match x:
        case Series() | DataFrame():  # type: ignore[misc]  # ignore does not work!
            pass
        case _:
            pass

This makes mypy emit main.py: error: Expected type in class pattern; found "Any" [misc] without any line number. Adding the # type:ignore[misc] statement ends up not doing anything. I think it is because both Series and DataFrame are of Any-type (not using pandas-stubs here since it still raises too many issues)

Your Environment

• Mypy version used: 1.4.0
• Python version used: 3.11