[issue32856] Optimize the `for y in [x]` idiom in comprehensions

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +16365
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16814

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32856>
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