anchor.diff:  import 'dart:mirrors';
   import 'dart:io';
   import 'package:path/path.dart' as path;
  -
   
   Future<String> httpGet(String url) {
     HttpClient client = new HttpClient();
  
positive.code:   }).toList();
  }
  
  
  /// Takes a list of paths and if an element is a directory it expands it to
  /// the Dart source files contained by this directory, otherwise the element is
  /// added to the result unchanged.
  
negative.code:   });
    return files;
  }
  