struct FixedStruct1 {
    a int
    b string
    c ?int
    d ?string
}

fn encode_struct[T](val T) []string {
    mut out := []string{}
    $for field in T.fields {
        value := val.$(field.name)
        $if field.is_option {
            gg := value ?
            println(gg)
            out << '${gg}'
        } $else {
            gg := value
            println(gg)
            out << gg.str()
        }
    }
    return out
}

fn test_main() {
    out := encode_struct(FixedStruct1{1, 'foo', 4, 'bar'})
    assert out[0] == '1'
    assert out[1] == 'foo'
    assert out[2] == '4'
    assert out[3] == 'bar'
}