anchor.diff:      | 'pop'
       ;
   
  -argument_b
  +argumentB
       : REGISTER
  -    | location_in_register
  -    | location_offset_by_register
  +    | locationInRegister
  +    | locationOffsetByRegister
       | PUSH
       | PEEK
       | pick
  
positive.code:     : [abcxyzijABCXYZIJ]
      ;
  
  unary_opcode
      : JSR
      | INT
      | IAG
  
negative.code:     | NUMBER
      ;
  
  binaryOperation
      : binaryOpcode argumentB ',' argumentA
      ;
  
  binaryOpcode
      : SET
      | ADD
      | SUB
  