+val sharing_map_acc:
+ ('acc -> 'a -> 'acc * 'a) -> 'acc -> 'a list -> 'acc * '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
+exception FailureAt of int
+(* 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. It can also raise FailureAt when ??? *)
+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