[issue35711] Print information about an unexpectedly pending error before crashing

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch, patch, patch
pull_requests: +11071, 11072, 11073
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35711>
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