Example from #5485 works with mypy 0.902 ``` from dataclasses import dataclass from typing import Callable @dataclass class Repro: fn: Callable[[int], str] r = Repro(fn=repr) assert "1" == r.fn(1) ``` but let's change the dataclass to a frozen one ``` from dataclasses import dataclass from typing import Callable @dataclass(frozen=True) class Repro: fn: Callable[[int], str] r = Repro(fn=repr) assert "1" == r.fn(1) ``` then ``` $ mypy t.py t.py:9: error: Invalid self argument "Repro" to attribute function "fn" with type "Callable[[int], str]" t.py:9: error: "str" not callable Found 2 errors in 1 file (checked 1 source file) ```