[antlr-interest] anybody help with me a python grammar rule?

[Terence Parr]

Folks, the formal parameter list for functions looks wacky in the 
distribution and on the net.

First the grammar in the distribution:

varargslist: (fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' 
NAME) | fpdef ['=' test] (',' fpdef ['=' test])* [',']
fpdef: NAME | '(' fplist ')'
fplist: fpdef (',' fpdef)* [',']

The one from the doc is

parameter_list ::=
              (defparameter ",")*
                 ("*" identifier [, "**" identifier]
                 | "**" identifier
                   | defparameter [","])

defparameter ::=
              parameter ["=" expression]

sublist ::=
              parameter ("," parameter)* [","]

parameter ::=
              identifier | "(" sublist ")"

My question here is why have the final '| defparameter [","]' alt in 
parameter_list????  Surely it's redundant (might have to move a comma, 
but...)

Can anybody give me some examples of the various things parameters 
might look like in the wacky cases?

Thanks!

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