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

[Gregory P. Smith]

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

If we were to ship a "chaos" mode in the CPython interpreter itself, I assume you envision an interpreter flag and/or env var?  If it required someone compiling the interpreter a special way I don't think it would be widely adopted within continuous integration testing systems.

I was actually pondering doing a "chaos" mode of sorts at work because I have the power to cause everyone's tests to be run that way mode by default.  (I'd basically just disable interning and str/int singletons)  But while it's a nice idea, it's low on my work priorities.  While we had thousands of is literal comparisons that we're about to fix en-masse, they are only a tiny fraction of all literal comparisons in our codebase.  And pylint is now more widely used which should help prevent new ones.

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