second type argument to `Generator` is unsafe

[DetachHead]

Description

Code sample in basedpyright playground

from collections.abc import Generator
from typing import reveal_type


def iter() -> Generator[None, int, None]:
    reveal_type((yield)) # basedpyright: int, runtime: NoneType


for _ in iter():
    ...

[KotlinIsland]

i think it's more like: generators in for loops are not checked correctly