anchor.diff:          example =
             ''
               BrowsePoll cups.example.com
  -            LogLevel debug
  +            MaxCopies 42
             '';
           description = ''
             Extra contents of the configuration file of the CUPS daemon
  
positive.code: 
      services.printing.extraConf =
        ''
          LogLevel info
  
          DefaultAuthType Basic
  
          <Location />
  
negative.code: 
      WebInterface ${if cfg.webInterface then "Yes" else "No"}
  
      LogLevel ${cfg.logLevel}
  
      ${cfg.extraConf}
    '';
  
  