// Test: Pattern matching
type Option<'a> =
  | Some of 'a
  | None

let unwrap_or = fn default opt =>
  match opt with
  | Some(x) => x
  | None => default
  end

let main = fn () =>
  let x = Some(42) in
  let y = None in
  let result1 = unwrap_or(0, x) in
  let result2 = unwrap_or(0, y) in
  print(result1)