[issue32912] Raise non-silent warning for invalid escape sequences

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

I'm leaving this open, as we may still want to do it in 3.9+, just in a less disruptive manner.  (That, and how, hasn't been decided yet)

Follow the thread(s) on python-dev for the latest on that.

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resolution: fixed -> 
stage: resolved -> 
status: closed -> open
versions: +Python 3.9 -Python 3.8

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<https://bugs.python.org/issue32912>
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