#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ops::Shl;
#[derive(PartialEq, Debug)]
struct Scalar(usize);
impl Shl<Scalar> for Scalar {
    type Output = Self;
    fn shl(self, Self(rhs): Self) -> Self::Output {
        let Self(lhs) = self;
        Self(lhs << rhs)
    }
}
fn main() {
    assert_eq!(Scalar(4) << Scalar(2), Scalar(16));
}