#[derive(Copy, Clone, Debug)]
struct Matrix {
    inner: [[u8; 2]; 2]
}

impl std::ops::Mul<Matrix> for u8 {
    type Output = Matrix;
    fn mul(self, Matrix { inner: right }: Matrix) -> Matrix {
        let mut inner = [[0; 2]; 2];
        for i in 0..2 {
            for j in 0..2 {
                inner[i][j] = self * right[i][j];
            }
        }
        Matrix { inner }
    }
}

fn main(){
    let result = 5 * Matrix { inner: [[1, 2], [3, 4]] };
    println!("{:?}", result);
}