contract LetPatterns =

  record r = {x : int, y : int, b : bool}

  entrypoint test() = foo([1, 0], (2, 3), Some(4), {x = 5, y = 6, b = false})

  entrypoint foo(xs : list(int), p : int * int, some : option(int), r : r) =
    let x :: _  = xs
    let (a, b)  = p
    let Some(n) = some
    let {x = i, y = j} = r
    x + a + b + n + i + j

  entrypoint lc(xs : list(option(int))) : list(int) =
    [ x | Some(x) <- xs ]