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[Steve Kelem <s_kelem@pacbell.net>]

The top-level rule in the SableCC grammar is

grammar = P.package? P.Helpers? P.states? P.tokens? ign_tokens? 
P.productions?;

But it's convenient for a grammar writer to have a stock template, 
especially because the order of these sections is fixed.

/* Stock header for my template */
Package ;
Helpers ;
States ;
Tokens ;
Ignored  Tokens ;
Productions ;

In the current grammar for SableCC, the above is invalid.  In fact, any 
time any of those sections is empty, you're not allowed to use the 
keyword for that section.

A few small changes to the grammar would allow empty sections without 
invalidating the grammar or having to comment out a section.

helper_def = helper? semicolon;
helper = id equal reg_exp;

token_def = token? semicolon;
token = state_list? id equal reg_exp look_ahead?;

prod = production? semicolon;
production = id equal alts;

The ramification of this is that extra semicolons can be used without 
getting syntax errors, at the cost of recognizing (and ignoring) empty 
helpers/tokens/productions.

Steven Kelem, Ph.D.