Link.Extinclude Sexplib0.Sexpable.S1 with type 'a t := 'a tval t_of_sexp : (Sexplib0.Sexp.t -> 'a) -> Sexplib0.Sexp.t -> 'a tval sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.tval language : 'a t -> Language.tval value : 'a t -> 'aval make : ?charset:Charset.t -> ?language:Language.t -> 'a -> 'a t