[issue35454] Fix miscellaneous issues in error handling

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

This is an extraction from my larger patch. These changes fix real bugs and should be backported.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35454>
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