[issue28128] Improve the warning message for invalid escape sequences

[Eric V. Smith]

Eric V. Smith added the comment:

Tim: Cool! That's way more useful than I thought it would be.

Serhiy: It's a proof of concept. Lots of design remains to be done. I'm not sure we've agreed on the concept yet, so I don't think it's worthwhile designing the API.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28128>
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