Echo variable from frontend in widget dashboard form

I create a WordPress widget and want to echo $widget_id variable inside

   function form($instance); 

to be visible inside WP dashboard. Variable exists http://ift.tt/1n7vqxu and is echoed in frontend using

 function widget( $args, $instance )

without issues. Is that possible? (when I try to echo variable I get notice that variable is undefined, and it is not displayed)