Right now there are two tests for name colisions of type parameters of type aliases and functions:

• cpython/Lib/test/test_type_params.py

  Lines 11 to 12 in 27c68a6

  	def test_name_collision_01(self):
  	check_syntax_error(self, """def func[**A, A](): ...""")

• cpython/Lib/test/test_type_aliases.py

  Lines 11 to 12 in 27c68a6

  	def test_name_collision_01(self):
  	check_syntax_error(self, """type TA1[A, **A] = None""", "duplicate type parameter 'A'")

They only test A and **A collide. But, PEP clearly states that A and *A collide as well.
I will send a PR.

I am really sorry that I have to put all my review comments to #103764 as separate issues, but I've missed my chance to properly review the PEP's implementation.

Linked PRs

• gh-105437: Improve tests of type params names for PEP 695 #105438
• [3.12] gh-105437: Improve tests of type params names for PEP 695 (GH-105438) #105452