R. David Murray <rdmur...@bitdance.com> added the comment:

My impression is that IGNORE_EXCEPTION_DETAIL is designed to allow you
to have a doctest as an example with a fully typed out exception detail,
but have it pass even if the exception detail changes.  If that is
indeed the original design, then I think your case 4 should pass.]

The one argument against it that I can see is the hypothetical case of
an x.y.Error passing when the code actually raised an a.b.Error when a
rename is *not* involved.  But that seems like a marginal enough case
that we could just ignore it.  Especially since having case 4 pass makes
the behavior of the modified IGNORE_EXCEPTION_DETAIL more consistent.

----------
nosy: +r.david.murray

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7490>
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