($ mk-counter
   (-> (init)
       ($ counter (- init 1))
       (-> ()
           (! counter (+ counter 1))
           counter)))

($ a (mk-counter 5))
($ b (mk-counter 32))

(assert= 5 (a))
(assert= 32 (b))
(assert= 33 (b))
(assert= 6 (a))
(assert= 7 (a))
(assert= 34 (b))

($ (c) 42)

($ (d)
   (+ (c) 1))

(assert= 43 (d))


($ hello 34)

($ (i)
   ($ (j)
      ($ (k)
         (println hello))))

(((i)))

($ @m './mod2')

($ (u)
   ($ (v)
      ($ (w)
         (assert= 42 m::var)
         (assert= 14 (m::fun 7))
         259 )))

(assert= 42 ((-> () m::var)))
(assert= 259 (((u))))