Rust exercicio trait+generics ex 8

main.rs

trait DescriptionStd {
    fn description(&self) -> String {
        String::from("No Description")
    }
}

struct Elemento<T> {
    item: T,
}

// Comentando funciona ok.
impl<T> DescriptionStd for Elemento<T> {
    fn description(&self) -> String {
        String::from("Tipo generico")
    }
}

impl DescriptionStd for Elemento<i32> {
    fn description(&self) -> String {
        String::from("Elemento i32: ") + &self.item.to_string()
    }
}

impl DescriptionStd for Elemento<String> {
    fn description(&self) -> String {
        String::from(self.item.as_str())
    }
}

fn main() {
    let elemento = Elemento { item: 10 };
    println!("{}", elemento.description());
    let elemento = Elemento {
        item: String::from("tipo String"),
    };
    println!("{}", elemento.description());
}