anchor.diff: -#!/path to dart executable
  +#!/path to dart
   
   // Copyright (c) 2014, Google Inc. Please see the AUTHORS file for details.
   // All rights reserved. Use of this source code is governed by a BSD-style
  
positive.code: 
  void main()
  {
  
    Stream sIn = stdin;
    try {
      StreamSubscription cmdSubscription = sIn
        .listen((data) {
          try {
            Map jsonObj = _transformInput(data);
            if (jsonObj != null) {
              _sendMessage(JSON.encode(jsonObj));
              if (jsonObj.containsKey("action")) {
                String str = jsonObj["action"];
                if (str == "dartium") {
                  _runDartium();
                }
              }
            }
          } catch(e) {
            _sendMessage('{"exception":"${e.toString()}"}');
          }
        },
        onError: (e) => _sendMessage('{"onError":"${e.toString()}"}'));
    } catch (e) {
      _sendMessage('{"exception":"${e.toString()}"}');
    }
  
negative.code:   Map jsonObj;
    int len = _fromBytesToInt32(data.sublist(0,4));
    if (len > 0) {
      String source = UTF8.decode(data.sublist(4));
      jsonObj = JSON.decode(source);
    }
    return jsonObj;
  