[issue27364] Deprecate invalid unicode escape sequences

[Emanuel Barry]

Emanuel Barry added the comment:

I found the cause of the failed assertion, an invalid escape sequence slipped through in a file. Patch attached (also with Serhiy's comments).

It worries me a little though that pure Python code can cause a hard crash. Ok, it worries me a lot. Please don't merge this until it's fixed. I'm guessing this is a combination of unittest catching warnings and compiling the faulty source file. As to why a malformed node (i.e. one that raised a DeprecationWarning) managed to pass through unharmed is beyond me.

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Added file: http://bugs.python.org/file43527/deprecate_invalid_unicode_escapes_2.patch

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