@Override
 protected String getUnassignedRuleCallToken(
     EObject semanticObject, RuleCall ruleCall, INode node) {
   if (ruleCall.getRule() == grammarAccess.getArrayBracketsRule())
     return getArrayBracketsToken(semanticObject, ruleCall, node);
   else if (ruleCall.getRule() == grammarAccess.getOpSingleAssignRule())
     return getOpSingleAssignToken(semanticObject, ruleCall, node);
   return "";
 }