Sexp_app.Sexpstype t = Core.Sexp.t Core.Hash_set.tval create : unit -> tval of_list : Core.Sexp.t list -> tinclude Core.Sexpable with type t := tinclude Sexplib0.Sexpable.Of_sexp with type t := tval t_of_sexp : Sexplib0.Sexp.t -> tinclude Sexplib0.Sexpable.Sexp_of with type t := tval sexp_of_t : t -> Sexplib0.Sexp.t