[issue27921] f-strings: do not allow backslashes

[Roundup Robot]

Roundup Robot added the comment:

New changeset 899ee1e68a8d by Eric V. Smith in branch 'default':
Issue 27921: Remove backslash from another f-string.
https://hg.python.org/cpython/rev/899ee1e68a8d

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27921>
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