Anyone managed to get PPX's working via utop?

[Yaron Minsky]

Has anyone had luck getting the PPX converters working with opam and utop?  After installing the new packages and #requiring' them in utop, no love:

utop # type t = int [@@deriving compare];;

Cannot locate deriver compare

I can get other ppx_deriving extensions to work just fine, e.g.:

utop # type t = int [@@deriving show];;

type t = int                                                                                                     val pp : Format.formatter -> t -> unit = <fun>                                                   val show : t -> bytes = <fun>

Any ideas what I should do differently?

y

[Jeremie Dimino]

I'm not sure why, but it seems that you need to load ppx_deriving explicitely first:

utop # #require "ppx_deriving";;

utop # #require "ppx_sexp_conv";;

utop # type t = int [@@deriving sexp];;

Error: Unbound module Sexplib

Someone reported it on github too: https://github.com/janestreet/ppx_sexp_conv/issues/1

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Jeremie