+let split_nth n l =
+ let rec aux acc n l =
+ match n, l with
+ | 0, _ -> List.rev acc, l
+ | n, [] -> raise (Failure "HExtlib.split_nth")
+ | n, hd :: tl -> aux (hd :: acc) (n - 1) tl in
+ aux [] n l
+
+let list_last l =
+ let l = List.rev l in
+ try List.hd l with exn -> raise (Failure "HExtlib.list_last")
+;;
+