Hi. I've noticed it today. Sorry for the lack of a diff :/
$ black foo.py Traceback (most recent call last): File "/usr/local/bin/black", line 5, in <module> from black import patched_main File "/usr/local/lib/python3.10/site-packages/black/__init__.py", line 37, in <module> from black.cache import Cache File "/usr/local/lib/python3.10/site-packages/black/cache.py", line 19, in <module> from typing_extensions import Self ModuleNotFoundError: No module named 'typing_extensions' # pkg_info -qI py3-black py3-black-23.9.1 -- Regards, Mikolaj