[antlr-interest] ahum.. tree question

[Lloyd Dupont]

here is my rule:
===========
compare : (shift -> shift)
  (
       ( (LT | GT | LTE | GTE) s=shift -> ^((LT | GT | LTE | GTE) $compare $s) )*
          | is='is' i=identifier -> ^(IS[$is] $compare $i)
          | as='as' i=identifier  -> ^(AS[$as] $compare $i)
  )
 ;
 ===========

it doesn't work...
it looks like think ANTLR doesn't like my 
^((LT | GT | LTE | GTE) 

in the tree rewriting rule.
any tip on how I could rewrite this tree? 

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