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

[Irit Katriel]

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

Note that my PR can (and should) be backported, while a change in the semantics of __context__ assignment, I'm not sure.

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