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

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

It looks like everyone is in favor of the change.  I'll apply the patch after adding some comments and tests.

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assignee: ncoghlan -> rhettinger

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<http://bugs.python.org/issue11333>
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