[issue12422] When deepcopying, don't store immutable objects in the memo dict

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset e24ad85e9608 by Benjamin Peterson in branch 'default':
don't memoize objects that are their own copies (closes #12422)
http://hg.python.org/cpython/rev/e24ad85e9608

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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/issue12422>
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