anchor.diff:      );
     }
   
  -  Widget buildToolBar() {
  +  Widget buildToolBar(BuildContext context) {
       String toolbarCaption = hasWon ?
         'Awesome!!' : alive ?
           'Mine Digger [$detectedCount-$totalMineCount]': 'Kaboom! [press here]';
  
positive.code:       // FIXME: Strange to have the toolbar be tapable.
        center: new Listener(
          onPointerDown: handleToolbarPointerDown,
          child: new Text(toolbarCaption, style: Theme.of(this).text.title)
        )
      );
    }
  
    Widget build() {
      // We build the board before we build the toolbar because we compute the win state during build step.
      Widget board = buildBoard();
      return new Title(
        title: 'Mine Digger',
        child: new Scaffold(
          toolbar: buildToolBar(),
          body: new Container(
            child: new Center(child: board),
            decoration: new BoxDecoration(backgroundColor: Colors.grey[50])
  
negative.code:   final int posX;
    final int posY;
  
    Widget build(BuildContext context) {
      Widget text;
      if (flagged)
        text = buildInnerCell(new StyledText(elements : [textStyles[5], '\u2691']));
  