unused-import false negative when typing.Annotated has str parameters

[lggruspe]

Bug description

example.py:

# pylint: disable=missing-docstring
from pathlib import Path
import typing as t

example: t.Annotated[str, "Path"] = "/foo/bar"

Configuration

No response

Command used

pylint example.py

Pylint output

Success: no issues found in 1 source file

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

Expected behavior

It should report unused-import, since the parameter to Annotated does not refer to pathlib.Path.

Pylint version

pylint 2.15.3
astroid 2.12.10
Python 3.10.7 (main, Sep  7 2022, 00:00:00) [GCC 12.2.1 20220819 (Red Hat 12.2.1-1)]

OS / Environment

fedora 36

Additional dependencies

No response

[Pierre-Sassoulas]

I don't understand the example, what does the parameter of annotated refer to according to you ? I think "Path" does refer to pathlib.Path ?

[lggruspe]

What comes after the first parameter to Annotated is just "an arbitrary list of Python values".
Its interpretation is left to the library or tool that encounters the Annotated type: https://peps.python.org/pep-0593/#consuming-annotations.

So if I understand correctly, the "Path" in the example is just a string literal rather than a reference to a type.

[Pierre-Sassoulas]

Ok, I think you're right and it's a false negative. autoflake is not removing the import either, you could open the same issue in their repository if you want.

[DanielNoord]

Just to be sure, we should just ignore any second parameter to Annotated right? Or is there any case where it should be counted towards "usage".

[lggruspe]

I think so. mypy ignores the second parameter as well.