[antlr-interest] speaking of => etc...

[Micheal J]

> How about this:
> 
> (...)?             optional subrule
> (...)#>            syntactic predicate
> {...}>>            hoisting disambiguating semantic predicate
> {...}=>            gated semantic predicate

Better. Much better. We could protect/leverage more of what ANTLR-ites
already learned:

 (...)?             optional subrule
 (...)=>            syntactic predicate
 {...}>>            hoisting disambiguating semantic predicate
 {...}@>            gated semantic predicate

Everthing else stays the same as they are now.

Micheal