anchor.diff:        appBar: new AppBar(
           title: new Text('Travel stream')
         ),
  -      body: new Block(
  +      body: new ScrollableList(
  +        itemExtent: TravelDestinationItem.height,
           padding: const EdgeInsets.only(top: 8.0, left: 8.0, right: 8.0),
           children: destinations.map((TravelDestination destination) {
             return new Container(
  
positive.code:     assert(destination != null && destination.isValid);
    }
  
    final TravelDestination destination;
  
    @override
    Widget build(BuildContext context) {
  
negative.code:     TextStyle descriptionStyle = theme.textTheme.subhead;
      TextStyle buttonStyle = theme.textTheme.button.copyWith(color: theme.primaryColor);
  
      return new SizedBox(
        height: height,
        child: new Card(
          child: new Column(
            children: <Widget>[
              // photo and title
  