rec {

  x = 123;

  y = 567.890;

  a = "foo";

  b = "bar";

  c = "foo" + "bar";

  f =
    {
      z,
      x,
      y,
    }:
    if y then x else z;

  id = x: x;

  at =
    args@{
      x,
      y,
      z,
    }:
    x;

  ellipsis =
    {
      x,
      y,
      z,
      ...
    }:
    x;

}