anchor.diff:      page = 0;
       list.clear();
       _hasNext = true;
  +    _finishedWithError = false;
       return loadNextPage();
     }
   
  
positive.code:     int reqVersion = _version;
      RestResult rr = await client.get();
      if (_version != reqVersion) return false;
  
      UnpackedData data = _driver.unpackData(rr.data);
      page++;
  
negative.code:   int page = 0;
  
    bool _hasNext = true;
    bool _finishedWithError = false;
    int _version = 0;
    RestListingDriver _driver;
  
  