[issue38908] Troubles with @runtime_checkable protocols

[Ken Jin]

Ken Jin <kenjin4096 at gmail.com> added the comment:

Yurii and Kevin, thanks for pushing the patch forward! Thanks for the review too Guido.

I'm closing this issue as all bugfix PRs have landed to bugfix branches. This will make its way into the next versions of Python for those respective branches.

One point of contention is whether to introduce this in 3.9.6. This will cause code previously working in 3.9.5 to throw an error if people were using it incorrectly. So it might be better to only enforce this in 3.10 onwards.

I created GH-26077 just in case the decision is made to revert. Sorry for any inconvenience caused everyone!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.10, Python 3.11 -Python 3.8

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<https://bugs.python.org/issue38908>
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