[issue46221] Simplify except* implementation and move helpers to exceptions.c

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

Fixed in https://github.com/python/cpython/pull/30289.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<https://bugs.python.org/issue46221>
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