Bug report

Bug description:

The following input will cause a SyntaxError. That's all well and good, but the message for the SyntaxError is incorrect.

f(A,*)

SyntaxError: iterable argument unpacking follows keyword argument unpacking

This is not correct. That error message is intended for cases like this f(**kwargs, *args).
This bug is present on 3.9, 3.10, and 3.11. I haven't tested 3.12, but I suspect that it is present there as well. The bug is not present on 3.8.

CPython versions tested on:

3.8 3.9, 3.10, 3.11

Operating systems tested on:

Linux, Windows

Linked PRs

• gh-109120: Fix handle of incorrect star expressions #117444
• [3.11] gh-109120: Fix syntax error in handlinh of incorrect star expressions… #117464
• [3.12] gh-109120: Fix syntax error in handlinh of incorrect star expressions… #117465