ability Zing where
  zing : Nat -> {Zing} (Nat -> Nat)
  zing2 : Nat -> Nat ->{Zing} (Nat -> Nat -> [Nat])

unzing z = case z of
  {a} -> a
  {Zing.zing n -> k} -> handle unzing in k (x -> x `drop` n)
  {Zing.zing2 n1 n2 -> k} -> handle unzing in k (n3 n4 -> [n1, n2, n3, n4])

--exacth = handle unzing in
--  f = Zing.zing 3
--  f 20 + 1
--
--overapplyh = handle unzing in
--  Zing.zing 3 20 + 1

-- SEQUENCES with abilities

-- sequence1 = handle unzing in [Zing.zing 1 4]

-- gives incorrect results
sequence2 = handle unzing in
  zonk = Zing.zing 1
  subtract10 = Zing.zing 10
  -- zonk somehow refers to subtract10 here
  zoot = zonk
  [zoot 40]

-- bombs
-- sequence3 = handle unzing in [Zing.zing 1 4, Zing.zing 2 4, Zing.zing 3 4, Zing.zing 4 4]

> sequence2