Benjamin Peterson added the comment:
Here is a patch, which fixes the issue. This brings up rather subtle issues.
For example you can have "{[{}]}" but not "{[{]}" as a format string. I wonder
if having braces in the field name at all should be an error.
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keywords: +patch
nosy: +benjamin.peterson
Added file: http://bugs.python.org/file29691/fix_format_spec.patch
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