[antlr-interest] action syntax

[Akhilesh Mritunjai]

> If I do
> type:("char"|"int") name:IDENTIFIER
> { do something with 'type' and 'name' }
> in the parser, ANTLR tells me there's no variable 'type'.

Its my favorite pet-peeve with ANTLR. Labels are extremely limited in how  
they can be used.

> If I make TYPE:"char"|"int"; in the lexer and say type:TYPE instead in
> the parser and try to parse some sensible data, I always get "unexpected
> token: char" or "unexpected token: int" as if it doesn't see I said to

Nope. It'd conflict with identifier.

The solution is:

typeName: "int" | "char";

decl:
   type:typeName name:IDENTIFIER
{
   // do whatever
}
;


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