[3.10] bpo-44524: Fix cryptic TypeError message when trying to subclass special forms in `typing` (GH-27710) by miss-islington · Pull Request #27815 · python/cpython

…ial forms in `typing` (pythonGH-27710)

This was a Python 3.9 regression.
(cherry picked from commit a3a4d20)

Co-authored-by: Yurii Karabas <1998uriyyo@gmail.com>