[issue34850] Emit a syntax warning for "is" with a literal

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +9034
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34850>
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