[issue11333] Add empty __slots__ to collections.abc abstract base classes

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset d50a71994f51 by Raymond Hettinger in branch 'default':
Issue #11333: Add __slots__ to the collections ABCs.
http://hg.python.org/cpython/rev/d50a71994f51

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nosy: +python-dev

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