[issue47129] Improve errors messages in f-string syntax errors

[Maciej Górski]

Change by Maciej Górski <macgors at gmail.com>:


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keywords: +patch
pull_requests: +30206
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/32127

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47129>
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