[Python-Dev] review request: anti-registration of ABCs

[Ivan Levkivskyi]

I have unsuccessfully tried to ping the issue http://bugs.python.org/
issue25958 on "anti-registration" of implicit ABCs by setting attributes to
None.

Guido said: "But with the indicated fixes, I think this good to go (for
Python 3.6)"

I have manually "rebased" the previous patch by Andrew Barnert taking into
account part of the work that has been done on Reversible and fixing final
minor comments.

I would like this to land in time for 3.6, could someone please review the
latest patch and check that everything is OK?

--
Ivan
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