[issue19656] Add Py3k warning for non-ascii bytes literals

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6bd21268876e by Serhiy Storchaka in branch '2.7':
Issue #19656: Running Python with the -3 option now also warns about
http://hg.python.org/cpython/rev/6bd21268876e

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nosy: +python-dev

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<http://bugs.python.org/issue19656>
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