Function storage_proofs_update::vanilla::prepare_tree_r_data

pub fn prepare_tree_r_data<Tree: 'static + MerkleTreeTrait>(
    source: &DiskStore<<Tree::Hasher as Hasher>::Domain>,
    _data: Option<&mut Data<'_>>,
    start: usize,
    end: usize,
) -> Result<TreeRElementData<Tree>>