Could you also add a NEWS entry?

Most changes to Python require a NEWS entry.

Please add it using the blurb_it web app or the blurb command-line tool.

Thanks; still missing the NEWS entry, though.

NEWS added :)

NEWS added :)

Thanks; that's some entry! :) Could you narrow it down to a couple of concise sentences that describe the actual changes only?

Also, could you please add tests for each case?

Also, could you please add tests for each case?

Do you mean put the test cases into test_linic.py?

To see if the OOB bug is fixed in commit 6203962 , I should write some code snippet calling function _PyArg_UnpackKeywordsWithVararg, compile it and ensure that it does not crash.

I'm not sure how can I do this without touching the Python vm or library,
though I have wrote a proof-of-concept by adding a built-in function and test it manually:
https://github.com/colorfulappl/cpython/tree/unpack_keywords_oob_bug_poc .

As for commit 6793f38, I'm looking at test_linic.py and will have a try later.

Is it still waiting for further changes?

Since gh-96178 has recently been merged, we finally have a test framework for functional clinic tests, so I'd say this PR should add some tests before we are ready to land.

I added some test cases and did another change in a48971d, so this PR may be necessary to be reviewed again. @erlend-aasland @isidentical @kumaraditya303

Another change in e6a4e13:
Argument Clinic does not generate noptargs when there is a vararg and no optional argument.

@colorfulappl, please fix the merge conflicts

Thanks @colorfulappl for the PR, and @erlend-aasland for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11.
🐍🍒⛏🤖

Sorry, @colorfulappl and @erlend-aasland, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 0da728387c99fe6c127b070f2d250dc5bdd62ee5 3.11

Sorry @colorfulappl and @erlend-aasland, I had trouble checking out the 3.10 backport branch.
Please retry by removing and re-adding the "needs backport to 3.10" label.
Alternatively, you can backport using cherry_picker on the command line.
cherry_picker 0da728387c99fe6c127b070f2d250dc5bdd62ee5 3.10

@kumaraditya303 I'm inclined to backport the functional tests for AC to 3.11 and 3.10. What do you think? We've backported tests to increase coverage in the maintained branches before; it would help backporting the AC fixes (and by the way, we should backport the AC bug fixes that we landed earlier today)

GH-100368 is a backport of this pull request to the 3.11 branch.

I have backported this to 3.11 (#100368).
And since 3.10 Argument Clinic does not support varargs parsing, there is no need to backport this to 3.10, IMHO.

It is too later for 3.10.