u8 *s = fib_path_list_format(pli, NULL);
s = format(s, "children:");
s = fib_node_children_format(path_list->fpl_node.fn_children, s);
u8 *s = fib_path_list_format(pli, NULL);
s = format(s, "children:");
s = fib_node_children_format(path_list->fpl_node.fn_children, s);