Code shared from the Rust Playground

playground.rs

struct Int32(i32);
struct Int64(i64);

pub trait Num {
    fn new() -> Self;
}

impl Num for Int32 {
    fn new() -> Self { Int32(0) }
}

impl Num for Int64 {
    fn new() -> Self { Int64(0) }
}

fn main() {
    let i_32 = Num::new();
}