[issue1026] Backport ABC to 2.6

[Guido van Rossum]

Guido van Rossum added the comment:

Committed revision 58099.
(I had to backport test_typechecks.py myself, and fix one issue in abc.py.)

Are you going to backport _abcoll.py and its tests?

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assignee:  -> gvanrossum
nosy: +gvanrossum
resolution:  -> accepted
status: open -> closed

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