Function mul 

pub fn mul<D: Copy + Mul<S, Output = D> + Send + Sync, S: Copy + Send + Sync, Op: ElementOp<S>>(
    dest: &mut StridedViewMut<'_, D>,
    src: &StridedView<'_, S, Op>,
    exec: Exec<'_>,
) -> Result<()>

Element-wise multiplication: dest[i] *= src[i].

Source may have a different element type from destination.