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

[Gregory P. Smith]

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

Oh neat, I didn't realize that Nathaniel.  That makes such warnings much more useful.

I'm fine if you go ahead with this change.  In the unlikely event it turns out to cause user annoyance problems in betas due to third party code that can't be updated, we can reconsider.

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