Function copy_scale_raw 

pub fn copy_scale_raw<T>(
    dest: &mut RawStridedMut<'_, T>,
    src: &RawStridedRef<'_, T>,
    scale: T,
) -> Result<(), StridedError>
where
    T: Copy + Mul<Output = T> + ElementOpApply + MaybeSendSync,

dest = scale * src over borrowed raw strided layouts.