[issue27921] f-strings: do not allow backslashes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> -            result.append(f'  [Previous line repeated {count-3} more times]\n')
> +            result.append(f'  [Previous line repeated {count-3} more times]''\n')

This looks a little ugly.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue27921>
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