anchor.diff:     * on the filesystem while the program has been running.
      */
     static Future<_FileNode> _resolve(String uri, 
  -                                  Path packageDir, 
  -                                  {bool useCache: true} ) {
  +                                    Path packageDir, 
  +                                    {bool useCache: true} ) {
       
       _log("Running DartCodeDb.resolve($uri, $useCache)");
       File sourceFile = new File(uri);
  
positive.code:    */
    static Map<String,Path> _hashToPathCache = new Map();
    
    /**
     * **NOTE: This method is not implemented correctly right now!**
     * 
  
negative.code:    * [_RequestBundle] objects. The returned [Future] is finished when all steps 
     * in the process is finished.
     */
    static Future downloadHashFiles(List<_RequestBundle> requests,
                                          Network sender) {
      if (logging) {
        _log("Running downloadFilesAndCreateLinks(");
        requests.forEach((_RequestBundle r) {
          _log("     ${r.fileHash}:");
          _log("        hashFilePath: ${r.hashFilePath}");
          _log("        filePath:     ${r.filePath}");
        });
        _log("     , $sender)");
      }
      
      // Create list of hash for files we need to request for. Don't create
      // requests for files we already waiting for.
      List<Future> waitingList = new List();
      List<String> downloadList = new List();
      
      requests.forEach((_RequestBundle bundle) {
        DownloadRequest request = _downloadQueue[bundle.fileHash];
        
        if (request == null) {
          request = new DownloadRequest(bundle.hashFilePath);
          
          // After file is downloaded we remove it from _downloadQueue 
          request.future = request.future.then((_) 
              => _downloadQueue.remove(bundle.fileHash));
          
          _downloadQueue[bundle.fileHash] = request;
          downloadList.add(bundle.fileHash);
        }
        
        waitingList.add(request.future);
      });
      
      // Send list of hashes as web request to sender.
      sender.send(_NETWORK_FILE_REQUEST_HANDLER, downloadList);
      
      return Future.wait(waitingList);;
    }
    
    /**
  