Yury Selivanov added the comment:

> If there is a chain A -> B -> C -> D -> E, after assignment C.__context__ = A 
> we will get a chain C -> A -> B -> D -> E. No exception is lost.

What to do when you try to chain "C -> C"?  

I'm not sure I like this reordering idea -- it might introduce some *very* hard 
to find bugs -- you expected one type of exception, then you used some external 
library, and after that you have a completely different exception.

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