如何设置ocamlinit以使ppx正常工作？

Question

这是我的ocamlinit：

(* Added by OPAM. *)
let () =
  try Topdirs.dir_directory (Sys.getenv "OCAML_TOPLEVEL_PATH")
  with Not_found -> ()
;;

(* ## added by OPAM user-setup for ocamltop / base ## 3ec62baf6f9c219ae06d9814069da862 ## you can edit, but keep this line *)

#use "topfind";;
(* ## end of OPAM user-setup addition for ocamltop / base ## keep this line *)

#thread;;

(* #ppx "ppx-jane -as-ppx";; *)
#require "ppx_jane";;
#require "core.top";;
#require "async";;
#require "core_extended";;


open Core.Std;;

就是这样，我在utop中得到了这个

utop # type test = char list [@@deriving show];;
Error: Cannot locate deriver show 

如果使用以#ppx开头的行，而不是以#require "ppx_jane"开头的行，则会出现以下错误

utop # type test = char list [@@deriving show];;
Error: ppx_type_conv: 'show' is not a supported type type-conv generator

我应该如何设置ocamlinit来使用[@@deriving show]

Answer 1

我设法使用#require "ppx_deriving.show";; (不管有没有#require "ppx_jane";;)让它工作。

Answer 2

除了皮埃尔的建议之外，我还发现我需要与ppx_jane沟通。

此外，我使用#require "ppx_deriving.std"而不只是ppx_deriving.show来获取ord和其他东西。

这是我的完整的ocamlinit

(* Added by OPAM. *)
let () =
  try Topdirs.dir_directory (Sys.getenv "OCAML_TOPLEVEL_PATH")
  with Not_found -> ()
;;

(* ## added by OPAM user-setup for ocamltop / base ## 3ec62baf6f9c219ae06d9814069da862 ## you can edit, but keep this line *)
#use "topfind";;
(* ## end of OPAM user-setup addition for ocamltop / base ## keep this line *)

#thread;;

#require "ppx_jane";;
#require "core.top";;
#require "async";;
#require "core_extended";;

#require "ppx_deriving.std";;

open Core.Std;;