[issue11297] Make ChainMap() public in the collections module.

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Raymond: Sorry I was imprecise.  I was referring specifically to “import __builtin__” in collections.rst.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11297>
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