[issue7928] String formatting: grammar wrongly limits [index] to integer

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I'm not exactly sure what wording to use here.

      element_index: `integer` | `identifier`

is not exactly correct, because it can be a non-identifier (as the example that eddy quotes points out. It's really "any sequence of characters except ']'".

Any ideas on the best way to express that? Maybe taking a clue from string literals, this would be:
      element_index: `integer` | index_string
      index_string: <any source character except "]"> +

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7928>
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