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