[issue45379] Improve errors related to frozen modules.

[Filipe Laíns]

Change by Filipe Laíns <lains at riseup.net>:


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pull_requests: +27460
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/29189

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45379>
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