fn main() {
	a0 := [1, 2]
	a1 := [3, 4]
	a2 := [5, 6]
	a3 := ['aa', 'bb']

	a2.prepend(a1)
	a1.insert(0, a0)
	a3.sort_with_compare(fn (a &string, b &string) int {
		if a < b {
			return -1
		}
		if a > b {
			return 1
		}
		return 0
	})
	a3.delete(0)
	a2.pop()
	a3.sort()

	b0 := ['aa', 'bb']!
	b0.sort_with_compare(fn (a &string, b &string) int {
		if a < b {
			return -1
		}
		if a > b {
			return 1
		}
		return 0
	})
	b0.sort()
}