4 (make-actor-with-address 'factorial
5 (lambda (self customer . message)
7 ((n) (send-message self customer n 1) 'sleep)
8 ((0 acc) (send-message customer acc) 'sleep)
9 ((n acc) (send-message self customer (- n 1) (* acc n)) 'sleep)))))
12 (make-actor-with-address 'println
13 (lambda (self . message)
17 (send-message factorial println 5)
18 (send-message factorial println 7)