R. David Murray added the comment:

It is a backward compatibility bug.  Something that used to work doesn't any 
more.  And it was explicitly *made* to work previously (the original __init__ 
statement was 'import collections.abc').  And it is is an implementation bug in 
the original patch because otherwise there would be no point in importing 
_collections_abc in __init__.

But you are right, it is relatively unlikely that anyone is relying on it.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20784>
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