val get : 'a t -> int -> 'a
val unsafe_get : 'a t -> int -> 'a
val set : 'a t -> int -> 'a -> unit
val unsafe_set : 'a t -> int -> 'a -> unit
val append : 'a t -> 'a t -> 'a t
val concat : 'a t list -> 'a t
val sub : 'a t -> int -> int -> 'a t
val make : int -> 'a -> 'a t
val iter : ('a -> unit) -> 'a t -> unit
val map : ('a -> 'b) -> 'a t -> 'b t
val fold_right : ('a -> 'b -> 'b) -> 'a t -> 'b -> 'b