anchor.diff:      }
     }
   
  +  /// Render internal representation of the [VNode].
     void render(VContext context) {
       if ((flags & (elementFlag | componentFlag | rootFlag)) != 0) {
         final html.Element r = ref;
  
positive.code:   }
  }
  
  void _updateImplicitChildren(VNode parent, List<VNode> a, List<VNode> b, VContext context, bool attached) {
    int aStart = 0;
    int bStart = 0;
  
negative.code:     return this;
    }
  
    /// Check if [VNode]s have the same type.
    ///
    /// [VNode]s can be updated only when they have the same type.
    bool sameType(VNode other) => (flags == other.flags && tag == other.tag);
  
    /// Create root level element of the [VNode] object, or [Component] for
    /// component nodes.
    void create(VContext context) {
      if ((flags & textFlag) != 0) {
        ref = new html.Text(data);
  