anchor.diff:    // Stop at 'debugger' statement.
     hasStoppedAtBreakpoint,
     (Isolate mainIsolate) async {
  -    for (var i = 0; i < Platform.script.pathSegments.length; i++) {
  -      print('segment $i: "${Platform.script.pathSegments[i]}"');
  -    }
  -    print('Directory: $directory');
       // Grab the VM.
       VM vm = mainIsolate.vm;
       await vm.reloadIsolates();
  
positive.code: 
      // Reload to v2.
      var response = await slaveIsolate.reloadSources(
         rootLibUri: '$directory${Platform.pathSeparator}'
                    'complex_reload${Platform.pathSeparator}'
                    'v2${Platform.pathSeparator}'
                    'main.dart',
      );
      expect(response['success'], isTrue);
  
  
negative.code: 
      // Reload to v3.
      response = await slaveIsolate.reloadSources(
        rootLibUri: v3Uri.toString(),
      );
      expect(response['success'], isTrue);
  
  