+val list_mapi: ('a -> int -> 'b) -> 'a list -> 'b list
+(* Finds the zero based index of the first element that satisfies a predicate*)
+val list_index: ('a -> bool) -> 'a list -> (int * 'a) option
+val sharing_map: ('a -> 'a) -> 'a list -> 'a list
+(* Iters in parallel on two lists until the first list is empty.
+ The second one can be shorter and is padded with a default value.
+ This function cannot fail. *)
+val list_iter_default2: ('a -> 'b -> unit) -> 'a list -> 'b -> 'b list -> unit
+(* Checks a predicate in parallel on three lists, the first two having the same
+ length (otherwise it raises Invalid_argument). It stops when the first two
+ lists are empty. The third one can be shorter and is padded with a default value. *)
+val list_forall_default3: ('a -> 'b -> 'c -> bool) -> 'a list -> 'b list -> 'c -> 'c list -> bool
+val list_forall_default3_var: ('a -> 'b -> 'c -> bool) -> 'a list -> 'b list -> 'c -> 'c list -> bool
+
+exception FailureAt of int