[Bug]: pyright reports type error when calling a bound method decorated with lru_cache

[slqy123]

What happened?

Here is the error message.

  /tmp/a/test.py:6:20 - error: Cannot access attribute "bar" for class "A*"
    Argument of type "Self@A" cannot be assigned to parameter "instance" of type "None" in function "__get__"
      "A*" is not assignable to "None" (reportAttributeAccessIssue)

This happens for pyright >= 1.1.394, tested in python = 3.12.7, 3.13.2 and asyncstdlib = 3.13.0.

But for mypy this is ok, so it may be an issue with pyright, but I do not know the exact reason behind it.

Minimal Reproducible Example

from asyncstdlib import lru_cache


class A:
    async def foo(self):
        await self.bar("hello")  # error
        await A.bar(self, "hello")  # this is ok

    @lru_cache
    async def bar(self, x: str):
        print("hello")
        return x

Request Assignment [Optional]

• I already understand the cause and want to submit a bugfix.

[slqy123]

Sorry for the duplicated, It seems to be same as #161, which has been solved in mypy.

So it is possilbe to fix it in pyright too?🙄

[maxfischer2781]

Thanks for the report! This should be fixed by #171 but it's not in a release yet. I'll try and get this done until next week.

[slqy123]

Thank you for you help!