Function repeated 

pub fn repeated<C>(
    view: View<'_>,
    layout: &Layout,
    axis: usize,
    counts: &[C],
) -> Result<Option<(Layout, Buffer)>, Error>
where
    C: Key,

repeat’s items with no plan to walk: view, the items of layout, with each cell along axis written as many times as its count, a run at a time (gather::repeat, or gather::positions for counts of 0 and 1). None where a count is negative or axis has keys, which repeat’s plan serves.