anchor.diff:  
     /**
      * Stop listening for uncaught errors through [port].
  -   *
  -   * WARNING: This method is experimental and not handled on every platform yet.
      *
      * The `port` should be a port that is listening for errors through
      * [addErrorListener]. This call requests that the isolate stops sending
  
positive.code: 
    /**
     * Requests the isolate to shut down.
     *
     * WARNING: This method is experimental and not handled on every platform yet.
     *
     * The isolate is requested to terminate itself.
     * The [priority] argument specifies when this must happen.
  
negative.code:   /**
     * Request that the isolate send [response] on the [responsePort].
     *
     * If the isolate is alive, it will eventually send `response`
     * (defaulting to `null`) on the response port.
     *
  