framework/behaviors/CacheableWidgetBehavior.php
public function afterRun($event)
    {
        echo $event->result;
        $event->result = null;

        $this->owner->view->endCache();
    }
public function afterRun($event)
    {
        echo $event->result;
        $event->result = null;

        $this->owner->view->endCache();
    }
Outputs widget contents and ends fragment caching.

@param WidgetEvent $event `Widget::EVENT_AFTER_RUN` event.