anchor.diff:  }
   
   main(List<String> arguments) {
  -  parseArgs(arguments);
  +  final env = parseArgs(arguments);
   
     List files = filesToProcess(env.input);
   
  
positive.code:   }
  
    env.verbose = args["verbose"];
  }
negative.code: /// Checks the validity of the provided arguments. Does not initialize actual
  /// processing.
  parseArgs(List<String> arguments) {
    final env = new Environment();
    var parser = new ArgParser();
  
    parser.addOption("sdk-root", abbr: "s",
  