[issue41084] Signify that a SyntaxError comes from an fstring in the error message

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

AFAIK, we don't guarantee the stability of error messages, so I think backporting is fine. It's all the better that this is just prefixing something to an existing error message.

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<https://bugs.python.org/issue41084>
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