anchor.diff:  
   import 'dart:core';
   import 'dart:html';
  +//import 'dart:isolate';
   import 'rialto.dart';
   
   final Map tests = {
  
positive.code: 
  
  void main() {
      String config;
  
      // The Rules:
  
negative.code:         try {
              final uri = Uri.parse(config);
              hub.commands.loadScriptFromUrl(uri);
          } catch (e) {
              Hub.error("Top-level exception caught", object: e);
          }
  