anchor.diff:        TextSpan span = _stackToTextSpan(new _MarkdownNodeList(stack));
         contents = new RichText(text: span);
   
  -      if (listIndents.length > 0) {
  +      if (listIndents.isNotEmpty) {
           Widget bullet;
           if (listIndents.last == 'ul') {
             bullet = new Text(
  
positive.code: 
    Widget _buildImage(BuildContext context, String src) {
      List<String> parts = src.split('#');
      if (parts.length == 0) return new Container();
  
      String path = parts.first;
      double width;
  
negative.code: 
      Widget contents;
  
      if (subBlocks.isNotEmpty) {
        List<Widget> subWidgets = <Widget>[];
        for (_Block subBlock in subBlocks) {
          subWidgets.add(subBlock.build(context));
  