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Module type Hashtbl.Key

module type Key = Core_hashtbl_intf.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.