Union type as second arg for `isinstance` raises W1116

[hofrob]

Bug description

The following is valid code in python 3.10+ (iirc):

a = 1

isinstance(a, int | str)

Configuration

# default

Command used

pylint --score=n -d all -e W1116 foo.py

Pylint output

************* Module foo
foo.py:3:0: W1116: Second argument of isinstance is not a type (isinstance-second-argument-not-valid-type)

Expected behavior

No error

Pylint version

$ pylint --version
pylint 2.16.3
astroid 2.14.2
Python 3.11.2 (main, Feb  9 2023, 13:29:03) [GCC 11.3.0]

OS / Environment

Ubuntu 22.04

Additional dependencies

No response

[hofrob]

I just discovered this because ruff is rewriting isinstance(a, (int, str)) to union types since v0.0.254. It may be related to another issue, but I came up empty after looking at existing ones.

[nickdrozd]

Fixed with #8206. 2.17 maybe?

[Pierre-Sassoulas]

We'll release 2.17 soon, we're only waiting for try star node support from astroid.