pub fn compute_position_and_nodes_with_no_spaces<'store, HAST, It>(
    root: HAST::IdN,
    offsets: &mut It,
    stores: &'store HAST
) -> (Position, Vec<HAST::IdN>, Vec<It::Item>)where
    HAST::IdN: Clone,
    HAST: HyperAST<'store>,
    HAST::T: WithSerialization + WithChildren<ChildIdx = It::Item>,
    It: Iterator,
    It::Item: Clone + PrimInt,