Sum and Product in Rust

main.rs

use std::convert::From;
use std::ops::{Add, Mul};

trait Sumable<T> {
    fn sum(&self) -> T;
}

trait Productable<T> {
    fn product(&self) -> T;
}

impl<T> Sumable<T> for Vec<T> where T: Add<Output = T> + From<i32> + Copy {
    fn sum(&self) -> T {
        self.iter().fold(T::from(0), |acc, &x| acc + x)
    }
}

impl<T> Productable<T> for Vec<T> where T: Mul<Output = T> + From<i32> + Copy {
    fn product(&self) -> T {
        self.iter().fold(T::from(1), |acc, &x| acc * x)
    }
}

fn main() {
    println!("{}", vec![2, 3, 5].sum());
    println!("{}", vec![2, 3, 5].product());
}