[antlr-interest] Tokens as keywords

[Gavin Lambert]

At 04:30 5/05/2008, Jim Idle wrote:
 >Whether you need the predicate depends on the presence of 
optional
 >identifiers that can be keywords. You need the predicate to 
avoid a
 >warning saying that the upcoming keyword is ambiguous and 
assuming
 >that the language expects it to be resolved this way.

Doesn't ANTLR simply drop predicates on the final alt, 
though?  (Except when backtracking is enabled.)