val list_uniq:
?eq:('a->'a->bool) -> 'a list -> 'a list (** uniq unix filter on lists *)
val filter_map: ('a -> 'b option) -> 'a list -> 'b list (** filter + map *)
+val list_rev_map_filter: ('a -> 'b option) -> 'a list -> 'b list
+val list_rev_map_filter_fold: ('c -> 'a -> 'c * 'b option) -> 'c -> 'a list -> 'c * 'b list
val list_concat: ?sep:'a list -> 'a list list -> 'a list (**String.concat-like*)
val list_findopt: ('a -> 'b option) -> 'a list -> 'b option
val flatten_map: ('a -> 'b list) -> 'a list -> 'b list
+val list_last: 'a list -> 'a
(** split_nth n l
* @returns two list, the first contains at least n elements, the second the