[antlr-interest] how to create a list of ast nodes correctly?

[v r]

Hi, i`m building an ast and have a problem with the following rule:
   
  array_declarator_suffix
 : (LEFT_BRACKET constant_expression? RIGHT_BRACKET)+ -> ^(ARRAY_DIM constant_expression?)+
   
  which is meant to define multidimensional arrays.
  antlr says:
  [05:23:20] E:\Engine\EngineSVN\Engine\trunk\antlr\GLSL\GLSLastParser.java:9808: illegal start of expression
[05:23:20]                 if ( !() ) {
[05:23:20]                        ^
[05:23:20] E:\Engine\EngineSVN\Engine\trunk\antlr\GLSL\GLSLastParser.java:9811: illegal start of expression
[05:23:20]                 while (  ) {
[05:23:20]                          ^
[05:23:20] 2 errors
   
  but if i write constant_expression instead of constant_expression? everything is ok.
   
   

       
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