[issue39601] brace escapes are not working in formatted string literal format specifications

[Zachary Ware]

Change by Zachary Ware <zachary.ware at gmail.com>:


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components:  -2to3 (2.x to 3.x conversion tool)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39601>
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