// This is the "new" format, with multiple
                        // roots, and `grandchild` is one of the
                        // roots.

                        // Single-root repository, we need to follow
                        // the root's children.

                debug!("has_nonempty_root: {:?}", has_nonempty_root);
                debug!("root_vertices: {:?}", root_vertices);

                    item.v_papa = vertex.to_option();

        debug!("fileid = {:?}", fileid);

        // Since we are replacing the value, we don't want to
        // decrement its reference counter (which del would do), hence
        // the transmute.
        //
        // This would normally be wrong. The only reason it works is
        // because we know that dbs_channels has never been forked
        // from another database, hence all the reference counts to
        // its elements are 1 (and therefore represented as "not
        // referenced" in Sanakirja).

    debug!("output_repository_no_pending: {:?}", prefix);

    debug!("prefix_basename = {:?}", prefix_basename);

                debug!("e = {:?}", e);

                debug!("e' = {:?}", e);

    // First, get the basename of the path we're outputting.

            debug!("next = {:?} basename = {:?}", next, basename);