Dataclass support doesn't fully resolve ClassVar annotation

[abelcheung]

Environment data

• Language Server version: 2021.1.3-pre.1, 2021.1.2, and possibly earlier versions affected as well
• OS and version: Windows 7
• Python version (& distribution if applicable, e.g. Anaconda): 3.8.2

Issue

Pylance complains with following sample code, with type checking mode set to basic or strict:

import typing
from dataclasses import dataclass

@dataclass
class FooBar:

    attr1: int = 1
    attr2: typing.ClassVar[str]

Screenshot here:

The warning persists when ClassVar is imported under any alias, like ClassV, typing.ClassVar, whatever.ClassVar. The warning only goes away if I use the exact word ClassVar in annotation. That is replacing first and last line in above sample code with:

from typing import ClassVar
    attr2: ClassVar[str]

[erictraut]

Thanks for the bug report. This will be fixed in the next release.

[jakebailey]

This issue has been fixed in version 2021.1.3, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/main/CHANGELOG.md#202113-27-january-2021