anchor.diff:      }
     }
   
  -  void setParentData(RenderObject child) {
  +  void setupParentData(RenderObject child) {
       // TODO(ianh): avoid code duplication
       if (child.parentData is! SectorChildListParentData)
         child.parentData = new SectorChildListParentData();
  
positive.code:     markNeedsLayout();
    }
  
    void setParentData(RenderObject child) {
      if (child.parentData is! SectorParentData)
        child.parentData = new SectorParentData();
    }
  
negative.code: 
  abstract class RenderSector extends RenderObject {
  
    void setupParentData(RenderObject child) {
      if (child.parentData is! SectorParentData)
        child.parentData = new SectorParentData();
    }
  