struct EmptyStruct {
    a int
    b []int
}

struct Encoder {
}

fn (e &Encoder) encode_array[T](val []T) []T {
    return val
}

fn encode_struct[T](val T) []string {
    e := Encoder{}
    mut out := []string{}
    $if T is $struct {
        $for field in T.fields {
            out << field.name
            out << field.is_array.str()

            $if field.is_array {
                value := val.$(field.name)
                out << e.encode_array(value).str()
                out << e.encode_array([1, 2]).str()
            }
        }
    }
    return out
}

fn test_main() {
    out := encode_struct(EmptyStruct{3, [2, 1]})
    assert out[0] == 'a'
    assert out[1] == 'false'
    assert out[2] == 'b'
    assert out[3] == 'true'
    assert out[4] == '[2, 1]'
    assert out[5] == '[1, 2]'
}