[issue27364] Deprecate invalid escape sequences in str/bytes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes, this was the intention. One of often errors is using "\n" in non-raw docstrings. This change doesn't prevent this error, but increases chances of catching it when there are other backslashes in the docstring.

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<http://bugs.python.org/issue27364>
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