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

[Yury Selivanov]

Yury Selivanov added the comment:

> Yury, do we need to handle more complicated infinite loops, where "self" doesn't actually show up in the loop? Here's an example:

My patch works for your example too.  Since it checks for loops in __context__ setter, you shouldn't be able to create complicated loops.

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