Dict Key Literal Autocompletion does not work with Attributes

[JakobDev]

Environment data

• Language Server version: v2022.11.30
• OS and version: Windows 10
• Python version: 3.10.0

Code Snippet

from typing import Literal


test_literal = Literal[
    "Hello", 
    "World",
    "Test",
    "123"
]


a: dict[test_literal, str] = {}
# a[] Autocompletion of Keys works


def test_func() -> dict[test_literal, str]:
    pass


b = test_func()
# b[] Autocompletion of Keys works


class TestClass:
    def __init__(self) -> None:
        self.test_dict = dict[test_literal, str]

        # self.test_dict[] Autocompletion of Keys does not work


c = TestClass()
# c.test_dict[] Autocompletion of Keys does not work

Repro Steps

Copy this code and start typing, where the comments are e.g. a[]. If you do this, the Autocompletion will pop-up and will provide Autocompletion for the Keys. ("Hello, World, Test, 123).

Expected behavior

It should work everywhere

Actual behavior

The autocompletion works only with a and b., but not with self.test_dict and c.test_dict.

Logs

Logs have nothing to do with this

[debonte]

One issue is that self.test_dict, as written, is a type alias.

However, even if I change the declaration of test_dict to one of the following, and Pylance understands that it is of type dict[test_literal, str], I still don't see the expected suggestions:

self.test_dict = dict[test_literal, str]()
self.test_dict: dict[test_literal, str] = {}

[bschnurr]

Currently we only support a limited number of cases.

This would be an enhancement.
Thank you

[rchiodo]

This issue has been fixed in prerelease version 2022.11.41, which we've just released. You can find the changelog here: CHANGELOG.md