[issue17422] language reference should specify restrictions on class namespace

[Caleb Donovick]

Change by Caleb Donovick <donovick at cs.stanford.edu>:


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pull_requests: +18041
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/18682

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17422>
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