Type annotation on method parameter is resolved using attrs class instance variables

[injust]

Bug Report

On an attrs class, mypy appears to resolve the httpx in the method parameter type annotation to the instance variable httpx instead of the module httpx.

To Reproduce

from __future__ import annotations

import httpx
from attrs import define, field


@define
class Foo:
    httpx: httpx.AsyncClient = field(factory=httpx.AsyncClient)

    def bar(self, response: httpx.Response) -> None:
        pass

Expected Behavior

The code should type check.

Actual Behavior

test.py:11: error: Name "httpx.Response" is not defined  [name-defined]

Your Environment

Using attrs 25.4.0

• Mypy version used: 1.18.2
• Mypy command-line flags: N/A
• Python version used: 3.13.5

[sterliakov]

Also #18525 and #12907, maybe a few more as well.

Attrs is a red herring here; the following reproduces the same issue:

from __future__ import annotations

import collections

class Foo:
    collections: collections.deque[int]

    def bar(self, response: collections.deque[int]) -> None:
        pass

# Or even

class Bar:
    list: str
    
    def baz(self, _: list[int]) -> None: ...