[issue2713] Py3k warn on unicode escapes in raw strings

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Why was this patch rejected?
with python2.6,
     len(ur'\u1234') == 1
with python3.0,
     len( r'\u1234') == 6

This is worth a warning IMO.
See also issue2570.

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nosy: +amaury.forgeotdarc

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