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

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

I like this solution of a syntax warning for `is <literal>` and I agree that `== None` should not be a warning.

(And for what its worth, I strongly disagree with making `is` a hybrid sometimes-check-identity-sometimes-check-equality operator.)

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nosy: +steven.daprano

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<https://bugs.python.org/issue34850>
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