in
aux [] l
+let list_rev_map_filter_fold f v l =
+ let rec aux v a = function
+ | [] -> v, a
+ | hd :: tl ->
+ begin match f v hd with
+ | v, None -> aux v a tl
+ | v, Some b -> aux v (b :: a) tl
+ end
+ in
+ aux v [] l
+
let list_concat ?(sep = []) =
let rec aux acc =
function