anchor.diff:     ;
   
   include
  -   : INCLUDE string
  +   : INCLUDE name
      ;
   
   expressionlist
  
positive.code:    | string
     | ('(' expression ')')
     | ('[' expression ']')
     | NOT expression
     | OFFSET expression
     ;
  
negative.code:    ;
  
  line
     : lbl? (assemblerdirective | instruction)? comment?
     ;
  
  instruction
  