[issue43151] is with literals in 3.8 release

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

I think the strangeness is happening because sometimes, the warning is printed to stderr, while other times, IDLE's parser notices the "is <literal>" anti-pattern and raises a SyntaxError.

See the attached screenshot for the IDLE output versus the console output for a recent 3.10 build.

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Added file: https://bugs.python.org/file49796/idle_stderr.jpg

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