struct Encoder {}

struct Writer {}

struct APrice {}

struct Association {
    association &Association = unsafe { nil }
    price       APrice
}

fn get_value_from_ref[T](val &T) T {
    return *val
}

fn (e &Encoder) encode_struct[U](val U, mut wr Writer) ! {
    $for field in U.fields {
        $if field.typ is &Association {
            assert get_value_from_ref(val.$(field.name)) == Association{
                association: unsafe { nil }
                price:       APrice{}
            }
        }
    }
}

fn test_main() {
    e := Encoder{}
    mut sb := Writer{}

    value := Association{
        association: &Association{
            price: APrice{}
        }
        price:       APrice{}
    }

    assert get_value_from_ref(&Association{
        price: APrice{}
    }) == Association{
        association: unsafe { nil }
        price:       APrice{}
    }

    e.encode_struct(value, mut sb)!
}