anchor.diff:  bool machineFormat;
   bool overwriteFileContents;
   Selection selection;
  -const followLinks = false;
  +final List<String> paths = [];
  +
  +const FOLLOW_LINKS = false;
   
   
   main(args) {
  
positive.code:   }
  }
  
  _formatDirectory(dir) => dir.listSync(followLinks: followLinks)
      .forEach((resource) => _formatResource(resource));
  
  _formatFile(file) {
    if (_isDartFile(file)) {
      try {
        var buffer = new StringBuffer();
        var rawSource = file.readAsStringSync();
  
negative.code:   if (options.rest.isEmpty) {
      _formatStdin(kind);
    } else {
      paths.addAll(options.rest);
      _formatPaths(paths);
    }
  }
  
  