contract Functions =
  private function curry(f : ('a, 'b) => 'c) =
    (x) => (y) => f(x, y)
  private function map(f : 'a => 'b, xs : list('a)) =
    switch(xs)
      [] => []
      x :: xs => f(x) :: map(f, xs)
  private function map'() = map
  private function plus(x, y) = x + y
  function test1(xs : list(int)) = map(curry(plus)(5), xs)
  function test2(xs : list(int)) = map'()(((x) => (y) => ((x, y) => x + y)(x, y))(100), xs)
  function test3(xs : list(int)) =
    let m(f, xs) = map(f, xs)
    m((x) => x + 1, xs)