proc main!() {
  let og = [1, 2, 3, 4, 5]
  let [..xs, a, b] = og
  assert "a" as a == 4
  assert "b" as b == 5
  assert "xs" as xs == [1, 2, 3]
  assert "og" as og == [1, 2, 3, 4, 5]
}