anchor.diff:    });
     return files;
   }
  -
  
positive.code: import 'dart:mirrors';
  import 'dart:io';
  import 'package:path/path.dart' as path;
  
  
  Future<String> httpGet(String url) {
    HttpClient client = new HttpClient();
  
negative.code:     if (directory.existsSync()) {
        for (var entry
            in directory.listSync(recursive: true, followLinks: false)) {
          var relative = path.relative(entry.path, from: directory.path);
          if (_isDartFileName(entry.path) && !_isInHiddenDir(relative)) {
            files.add(entry.path);
          }
        }
  