Description

Ruff complains with F821 Undefined name "xyz" for the values described in arguments typed as typing.Literal. I was however only able to reproduce this when Literal is imported indirectly (i.e. not from typing import Literal).

As an example, the following file passes all checks:

from typing import Literal

a: Literal["fu", "bar"] = "fu"
a = "bar"

But this does not:

• x.py

  from typing import Literal
  __all__ = ["Literal"]

• y.py

  from x import Literal
  a: Literal["fu", "bar"] = "fu"
  a = "bar"

• Output:

  $ ruff y.py
  y.py:2:12: F821 Undefined name `fu`
  y.py:2:18: F821 Undefined name `bar`
  

• Reproduced without any configuration changes.

• Ruff version:

  $ ruff --version
  ruff 0.0.225