anchor.diff:  line
       : cmd+ comment?
       | comment
  +    | print
       | procedureDeclaration
       ;
        
  
positive.code:     ;
  
  make
      : 'make' stringliteral value
      ;
  
  print
  
negative.code:     : COMMENT
      ;
       
  STRINGLITERAL
      : '"' STRING
      ;
  
  STRING
      : [a-zA-Z] [a-zA-Z0-9_]*
      ;
  