type t = ('a, 'b) tinclude Ppx_sexp_conv_lib.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> tval sexp_of_t : t -> Sexplib0.Sexp.tval create : Raw.t -> t Or_error.tValidated.Maketype t = ('a, 'b) tinclude Ppx_sexp_conv_lib.Sexpable.S with type t := tval t_of_sexp : Sexplib0.Sexp.t -> tval sexp_of_t : t -> Sexplib0.Sexp.tval create : Raw.t -> t Or_error.t