anchor.diff:  
   OF
       :   'of'
  -    ;
  -
  -SPECIFY
  -    :   'specify'
       ;
   
   SUBTYPE
  
positive.code:     ;
  
  typeClass
      : 'is' memberName
      ;
  
  typeConstraint
  
negative.code: //      style parameters below?
  memberDefinition
      : memberParameters?
        ( /*'...' |*/ block | (specifier | initializer)? ';'! )
      ;
      
  interfaceDeclaration
  