[issue29051] Improve error reporting involving f-strings (PEP 498)

[Mark Shannon]

Mark Shannon added the comment:

It is also worth mentioning that incorrect line numbers means that tools like pyflakes, pylint, mypy, lgtm, etc, need to reimplement parsing of f-strings.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29051>
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