[issue43797] Improve syntax error for invalid comparisons

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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keywords: +patch
pull_requests: +24052
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25317

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43797>
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