module main

fn decode_primitive[T]() !T {
    $if T is int {
        return T(1)
    } $else $if T is u8 {
        return T(10)
    } $else $if T is u16 {
        return T(100)
    }
    return error('decode_primitive: not found')
}

fn decode_array[T](_ []T) ![]T {
    mut arr := []T{}
    arr << decode_primitive[T]()!
    return arr
}

fn decode[T]() !T {
    $if T is $array {
        a := decode_array(T{})!
        return a
    }
    return error('decode: not found')
}

fn test_main() {
    assert decode[[]int]()! == [1]
    assert decode[[]u8]()! == [u8(10)]
    assert decode[[]u16]()! == [u16(100)]
}