// An implementation of the factorial function where each recursive
// call is to another contract. Not the cheapest way to compute factorial.
contract FactorialServer =
  function fac : (int) => int

contract Factorial =

  record state = {worker : FactorialServer}

  function init(worker) = {worker = worker}

  function set_worker(worker) = put(state{worker = worker})

  function fac(x : int) : int =
    if(x == 0) 1
    else x * state.worker.fac(x - 1)