val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
val some_if_all_elements_are_some : 'a option t -> 'a t option
val map2_prefix : ('a -> 'b -> 'c) -> 'a t -> 'b t -> 'c t * 'b t
val split_at : int -> 'a t -> 'a t * 'a t
val is_prefix : equal:('a -> 'a -> bool) -> 'a list -> of_:'a list -> bool
type !'a longest_common_prefix_result = private {
longest_common_prefix : 'a list;
first_without_longest_common_prefix : 'a list;
second_without_longest_common_prefix : 'a list;
}