fn main ()
  call fibo
    const 34
  echo

fn fibo (($x i64) -> i64)
  local.get $x
  const 3
  i.lt
  if (->)
    do
      const 1
      return
    do
      local.get $x
      const -1
      i.add
      call fibo
      local.get $x
      const -2
      i.add
      call fibo
      i.add
      return