anchor.diff:  
   expression
       :   primary
  -    |  'new' Identifier '(' methodParams? ')'
  +//    |  'new' Identifier '(' methodParams? ')'
       |  Identifier '.' Identifier '(' methodParams? ')'
       |  Identifier '(' methodParams? ')'
  +    |  'new' classType '(' methodParams? ')'
   //    |   expression ('++' | '--')
   //    |   ('+'|'-'|'++'|'--') expression
   //    |   ('~'|'!') expression
  
positive.code:         prodAnt?
          conAnt ?
          antApiOperation?
          resourcePath
          resourceDeclaration
      ;
  
negative.code:  ;
  
  methodParams
      :    ((literal | Identifier ('.' Identifier)*) ((',' (literal | Identifier))*))?
      ;
  
  type
  