trait Element {
    fn get_id(&self) -> u128;
}

struct Image {
    id: u128,
}

#[allow(dead_code)]
struct Video {
    id: u128,
}


impl Element for Image {
    fn get_id(&self) -> u128 {
        return self.id;
    }
}

//impl Element for Video {}

// lot of more elements...

#[allow(unused_variables)]
fn main() {
    let x = Image {id: 23};

}