Function assign_uninit_cpu_rayon 

pub fn assign_uninit_cpu_rayon<T, D>(
    c: &mut [MaybeUninit<T>],
    lc: &Layout<D>,
    a: &[T],
    la: &Layout<D>,
    pool: Option<&ThreadPool>,
) -> Result<(), Error>
where
    T: Clone + Send + Sync,
    D: DimAPI,