anchor.diff:      |breakStat
       |continueStat
       |varDeclStat
  +    |returnStat
  +;
  +returnStat:
  +    'return' expression? ';'
   ;
   
   varDeclStat:
  
positive.code:     //|   expression '.' 'new' nonWildcardTypeArguments? innerCreator
      //|   expression '.' 'super' superSuffix
      //|   expression DOT explicitGenericInvocation
      |     expression '.' Identifier arguments  #exprInvocation
      //|   expression LBRACK expression RBRACK
      //|   expression '(' expressionList? ')'
      //|   NEW creator
  
negative.code:     |   StringLiteral 
      |   BooleanLiteral 
      |   'null' 
      ;
  
  arguments
  