[issue12959] Add 'ChainMap' to collections.__all__

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 12bb3cd873c8 by Benjamin Peterson in branch 'default':
add ChainMap to __all__ (closes #12959)
http://hg.python.org/cpython/rev/12bb3cd873c8

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nosy: +python-dev
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12959>
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