[issue25782] CPython hangs on error __context__ set to the error itself

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +19787
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20543

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25782>
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