anchor.diff:    /// Execution context: [domScheduler]:write
     vdom.VRootBase<T> build() => null;
   
  -  /// Lifecycle method to update [Component].
  +  /// Lifecycle method to update [Component]. *EXPERIMENTAL*
     ///
     /// Execution context: [domScheduler]:write
     Future update() => null;
  
positive.code:     return null;
    }
  
    /// Experimental API
    dynamic scopeGet(Symbol key) {
      Component c = this;
      while (c != null) {
  
negative.code:     return null;
    }
  
    /// *EXPERIMENTAL*
    void scopeSet(Symbol key, dynamic value) {
      if (_store == null) {
        _store = new HashMap<Symbol, dynamic>();
  