2

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;;

正是有了这个，我在 utop 中得到了这个

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

#ppx如果我使用以代替开头的行#require "ppx_jane"，我会收到此错误

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]？

4

2 回答 2

1

我设法让它使用#require "ppx_deriving.show";;（有或没有#require "ppx_jane";;）工作。

于 2016-12-28T05:43:24.427 回答
0

除了 Pierre 的建议之外，我发现我需要使用ppx_jane.

此外，我使用#require "ppx_deriving.std"而不是仅仅ppx_deriving.show获取ord和其余的东西。

这是我完整的 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;;
于 2016-12-28T15:21:50.393 回答