Nick Coghlan added the comment:

Via issue 28410, Serhiy is adding a private "_PyErr_FormatFromCause" helper API 
to make explicit C level exception chaining easier within the implementation of 
CPython (this helps resolve issue 28214, an exception reporting problem in the 
new PEP 487 __set_name__ feature).

It may be sufficient to make that API public, and use that as the home of 
documentation for some of the subtleties discussed here.

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versions: +Python 3.7 -Python 3.5

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<http://bugs.python.org/issue23188>
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