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

[Guido van Rossum]

Guido van Rossum added the comment:

Ouch, it's unfortunate those APIs don't have an error return. :-(

Setting it to NULL is one option -- silently ignoring the assignment
(leaving whatever was there) might also be good? In 90% of the cases it
would be the same thing right? (I'm not familiar with this part of the code
TBH.)

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<http://bugs.python.org/issue25782>
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