struct Foo1 {
    arr1 [5]?int
    arr2 [5]int
}

fn get_has_option_fixed() ?int {
    foo := Foo1{}
    return foo.arr1[0]
}

fn get_no_option_fixed() int {
    foo := Foo1{}
    return foo.arr2[0]
}

fn test_option_fixed() {
    x := get_has_option_fixed() or { 0 }
    assert x == 0
    assert get_no_option_fixed() == 0
}

struct Foo2 {
mut:
    arr1 []?int
    arr2 []int
}

fn get_has_option() ?int {
    mut foo := Foo2{}
    foo.arr1 << 0
    return foo.arr1[0]
}

fn get_no_option() int {
    mut foo := Foo2{}
    foo.arr2 << 0
    return foo.arr2[0]
}

fn test_option_non_fixed() {
    x := get_has_option()?
    assert x == 0
    assert get_no_option() == 0
}