anchor.diff:    }
   }
   
  -class FillStackContainer extends SkyElementWrapper {
  +class FillStackContainer extends OneChildListRenderNodeWrapper {
   
     RenderCSSStack _root;
     RenderCSSStack _createNode() => new RenderCSSStack(this);
   
     static final FillStackContainer _emptyContainer = new FillStackContainer();
   
  -  SkyNodeWrapper get _emptyNode => _emptyContainer;
  +  RenderNodeWrapper get _emptyNode => _emptyContainer;
   
     FillStackContainer({
       Object key,
  
positive.code:   }
  }
  
  class TextFragment extends SkyElementWrapper {
  
    RenderCSSInline _root;
    RenderCSSInline _createNode() => new RenderCSSInline(this, this.data);
  
    static final TextFragment _emptyText = new TextFragment('');
  
    SkyNodeWrapper get _emptyNode => _emptyText;
  
    final String data;
  
  
negative.code:   );
  }
  
  class FlexContainer extends OneChildListRenderNodeWrapper {
  
    RenderCSSFlex _root;
    RenderCSSFlex _createNode() => new RenderCSSFlex(this, this.direction);
  