decl fruit-cost : \fruit -> \int
def fruit-cost : fruit = {
  var fruit-copy = fruit
  return (match <- fruit-copy with // consuming match
      | $banana -> 11
      | $apple | $orange -> 7)
}

decl amount-to-string : \int -> \bool -> \string
def amount-to-string : x is-zero-separated = {
  let ans = match x with
    | 0 ?? is-zero-separated -> "Zero"
    | 0 | 1 | 2 | 3 | 4 -> "Few"
    | x ?? (5--9)..contains: x -> "Several"
    | x ?? (10--19)..contains: x -> "Pack"
    | _ -> "Lots"
  return ans
}