[issue39049] Add "elif" to "for_stmt" and "while_stmt"

[Andrey]

Change by Andrey <komissar.off.andrey at gmail.com>:


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keywords: +patch
pull_requests: +17082
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17610

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39049>
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