anchor.diff:      ;
   
   blockItemList
  -    :   blockItem
  -    |   blockItemList blockItem
  +    :   blockItem+
       ;
   
   blockItem
  
positive.code:     ;
  
  identifierList
      :   Identifier
      |   identifierList ',' Identifier
      ;
  
  typeName
  
negative.code: 
  fragment
  FloatingSuffix
      :   [flFL]
      ;
  
  fragment
  