#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ops::Mul;
struct Scalar {
    value: usize,
}
#[derive(Debug, PartialEq)]
struct Vector {
    value: Vec<usize>,
}
impl Mul<Scalar> for Vector {
    type Output = Self;
    fn mul(self, rhs: Scalar) -> Self::Output {
        Self {
            value: self.value.iter().map(|v| v * rhs.value).collect(),
        }
    }
}
fn main() {
    let vector = Vector { value: vec![2, 4, 6] };
    let scalar = Scalar { value: 3 };
    assert_eq!(vector * scalar, Vector { value : vec![6, 12, 18] });
}