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

Thu Oct 4 14:23:24 EDT 2018

Neil Schemenauer <nas-python at arctrix.com> added the comment:

> The problem with a SyntaxWarning is that the wrong people will see it. It gets in the way of users of applications that happen to be written in Python.

Turn the check on only when PYTHONDEVMODE is set?  Seems like it solves the issue with the wrong people seeing the warning.

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nosy: +nascheme

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