[issue31333] Implement ABCMeta in C

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

There has been a lot of work by a number of people on this feature leading up to the 3.7.0b1.  Thank you!  On PR 5273, Yury says that he believes the feature is ready to merge but would prefer an extension until 3.7.0b2 and that Guido has agreed.  I'll defer to Yury's judgement on this and somewhat reluctantly allow an extension: there's a lot going on here.  Let's try to get it in as soon as we can, please!

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nosy: +ned.deily
priority: normal -> deferred blocker
versions: +Python 3.8

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<https://bugs.python.org/issue31333>
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