fn f_array[T](a []T) T {
    return a[0]
}

fn g_array[T](mut a []T) {
    a[0] = a[1]
}

fn test_array() {
    // []int
    mut a1 := [7, 8]
    r1 := f_array(a1)
    assert r1 == 7

    g_array(mut a1)
    assert a1[0] == 8

    // []f64
    mut a2 := [1.1, 2.2]
    r2 := f_array(a2)
    assert r2 == 1.1

    g_array(mut a2)
    assert a2[0] == 2.2

    // []string
    mut a3 := ['aa', 'bb']
    r3 := f_array(a3)
    assert r3 == 'aa'

    g_array(mut a3)
    assert a3[0] == 'bb'

    // []bool
    mut a4 := [true, false]
    r4 := f_array(a4)
    assert r4 == true

    g_array(mut a4)
    assert a4[0] == false
}