Module type Hash_set.Elt

module type Elt = Hashtbl.Key

type t 
val sexp_of_t : t -> Sexplib.Sexp.t
val t_of_sexp : Sexplib.Sexp.t -> t
val compare : t -> t -> int
val hash : t -> int
Values returned by hash must be non-negative. An exception will be raised in the case that hash returns a negative value.