B024: false negative with annotated, unassigned instance variables of a class

[cmp0xff]

This issue derives from #14455 (comment).

[copied from other issue] Meanwhile, upon checking the Python documentation, it turns out that only when subscribed by typing.ClassVar is an annotate variable considered a class variable. Copied from the above-mentioned documentation:

class Starship:
    stats: ClassVar[dict[str, int]] = {} # class variable
    damage: int = 10                     # instance variable

What I had as an example in the original post is therefore an instance variable, not a class variable. This contradicts the discussion in PyCQA/flake8-bugbear#293, which only has to do with typing.ClassVar.

[dylwil3]

To clarify, the suggestion here is this:

from abc import ABC

class Foo(ABC):
    a: ClassVar[int]              #<--- should not trigger B024

class Bar(ABC):
    b: int              #<--- should trigger B024 because it is not annotated as a class variable

this makes some sense to me but I'd have to read the documentation to make sure I'm understanding correctly, so I'm not sure whether to adopt this behavior just yet.