Auto-ref woes

matrix.rs

#[deriving(Show)]
struct Matrix
{
    data: Vec<f32>
}

trait ToMat
{
    fn to_mat(self) -> Matrix;
}

impl<'l> ToMat for &'l Matrix
{
    fn to_mat(self) -> Matrix
    {
        println!("Clone");
        Matrix{ data: self.data.clone() }
    }
}

impl ToMat for Matrix
{
    fn to_mat(self) -> Matrix
    {
        self
    }
}

impl
Mul<f32, Matrix>
for Matrix
{
    fn mul(&self, f: &f32) -> Matrix
    {
        let mut v2 = self.to_mat();
        for v in v2.data.mut_iter()
        {
            *v *= *f;
        }
        v2
    }
}

impl<'l>
Mul<f32, Matrix>
for &'l Matrix
{
    fn mul(&self, f: &f32) -> Matrix
    {
        let mut v2 = self.to_mat();
        for v in v2.data.mut_iter()
        {
            *v *= *f;
        }
        v2
    }
}

fn main()
{
    let m = Matrix{ data: vec![1.0f32, 2.0, 3.0] };
    let m2 = m * 2.0 * 5.0 * 3.0;
    println!("{}", m2);
}