anchor.diff:      ;
   
   fieldDeclaration
  -    :   accessType type variableDeclarators delimiter
  +    :   accessType? type variableDeclarators delimiter
       ;
   
   variableDeclarators
  
positive.code: 
  LINE_COMMENT
      :   '//' ~[\r\n]* -> skip
      ;
negative.code: 
  primary
      :   literal
      ;
  
  literal
  