include 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 sexp_of_edge : edge -> Ppx_sexp_conv_lib.Sexp.tval edge_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> edgeval compare : t -> t -> int