anchor.diff:  
         if (throttle > 0)
           args..add("--throttle")..add(throttle.toString());
  +
  +      if ()
       }
   
       _log.fine(args.join(" "));
  
positive.code: 
  import 'dart:async';
  import 'dart:io';
  import 'sync_options.dart';
  import 'load_options.dart';
  import 'package:logging/logging.dart';
  import 'package:path/path.dart' as path;
  
  
negative.code:     _url = new path.Context(style: path.Style.url, current: remoteRoot);
    }
  
    Future upload(String remotePath, String localPath, {LoadOption handleExisting}) async {
      var args = [
        "--upload", _url.absolute(remotePath), path.absolute(localPath)
      ];
  