type Ints = []int
fn test_first() {
ints := Ints([5, 10])
assert ints.first() == 5
}
fn test_last() {
ints := Ints([7, 4])
assert ints.last() == 4
fn test_index() {
ints := Ints([1, 5, 2, 3])
assert ints[2] == 2