[issue17644] str.format() crashes

[Benjamin Peterson]

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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