No autocomplete for Literal with descriptor __set__ method

[armoha]

Might be related to #5299

Environment data

• Language Server version: 2024.9.104
• OS and version: win32 x64
• Python version (and distribution if applicable, e.g. Anaconda): 3.11.9 64 bit
• python.analysis.indexing: true
• python.analysis.typeCheckingMode: off

Code Snippet

from __future__ import annotations

from typing import overload, Self, Literal


class FooDescriptor:
    @overload
    def __get__(self, instance: None, owner: type[Foo]) -> Self:
        ...

    @overload
    def __get__(self, instance: Foo, owner: type[Foo]) -> str:
        ...

    def __get__(self, instance, owner):
        if instance is None:
            return self
        return "foo"

    def __set__(self, instance: Foo, value: Literal["abc", "def"]) -> None:
        pass


class Foo:
    foo = FooDescriptor()


foo = Foo()
foo.foo = "_no_literal_suggestion_"

Repro Steps

Type foo.foo = "" and no auto-completes off the literal.

Expected behavior

Literal "abc", "def" are suggested in the autocomplete popup, just like how property works:

Actual behavior

No autocomplete popup appears.

Logs

https://gist.github.com/armoha/444e446feed23b09a19371e83dd6d3c9

[debonte]

If I annotate Foo.foo as ClassVar[FooDescriptor] I get the expected behavior.

[armoha]

Annotating ClassVar[FooDescriptor] solved it, thank you!