[antlr-interest] newbie problem)reference to rewrite element name without reference on left of ->.

[ali azimi]

Hi,
   
  I have a problem regarding rewrite error messages. The Rule1 produces Error1 when I try to generate code from it. But when I enclose the parser grammar(before ->) in parenthesis (Rule2), there is no error message.
   
    
     Why is that?
  
     Could you also tell me if referencing of  SLIST[$signallistitem.start] is ok? 

  Rule1 signallistitem
              :signalidentifier|signallistidentifier|timeridentifier
              ->^(SLIST[$signallistitem.start] signalidentifier signallistidentifier timeridentifier)
              ;
  Error1:
  Check grammar failed:
   (136):C:\Documents and Settings\...\FinalProjectSim.g:875:13:reference to rewrite element name without reference on left of ->.
   
   
  Rule2 signallistitem
              : ( signalidentifier|signallistidentifier|timeridentifier )
              ->^(SLIST[$signallistitem.start ]signalidentifier signallistidentifier timeridentifier)
              ;
  Thank you so much in advance.
   
  Best wishes,
   
  Al

       
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