Bug Report

Given the following code:

from __future__ import annotations

from collections.abc import Iterable
from typing import Any


class MyThing:
    def keys(self) -> Iterable[str]:
        return ['foo']

    def __getitem__(self, __key: str) -> Any:
        return 'bar'


def foo(**args: Any) -> None:
    print(args)


foo(**MyThing())

mypy generates an error at line 19: Argument after ** must be a mapping, not "MyThing"

Expected Behavior

No error should be generated since it works at runtime. This has been discussed over in the Python Type School, and pyright has been updated to support this.

Your Environment

• Mypy version used: 1.1.1
• Mypy command-line flags: n/a
• Mypy configuration options from mypy.ini (and other config files): n/a
• Python version used: 3.10.10