anchor.diff:     ;
   
   STRING2
  -   : '\'' ~ ['\'']* '\''
  +   :  '\u0027' ~ ['\u0027']* '\u0027'
      ;
   
   
  
positive.code:    : P T R
     ;
  
  
  NOT
     : N O T
     ;
  
  
  
  
  REGISTER
     : A X | B X | C X | D X | C I | D I | B P | S P | I P | C S | D S | E S | S S
     ;
  
negative.code:    ;
  
  line
     : lbl? (assemblerdirective | instruction)? comment?
     ;
  
  instruction
     : opcode expressionlist?
     ;
  
  lbl
  