[issue5237] Allow auto-numbered replacement fields in str.format() strings

[Eric Smith]

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

Thanks, Terry.

I think the only changes I'll make are:

arg_name: (`identifier` | `integer`)*
should be:
arg_name: (`identifier` | `integer`)?

And leave:
conversion: "r" | "s"
instead of:
conversion: "r" | "s" | "a"
because 'a' isn't valid in 2.7.

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<http://bugs.python.org/issue5237>
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