Unbound value "string_of_sexp"

Question

It works quite well in utop with #require "ppx_jane" but I added (preprocess (pps ppx_jane)) in my dune file which looks like this:

(library
 (preprocess (pps ppx_jane))
 (name raftml)
 (modules raft rpc types)
 (libraries 
   core 
   core_unix 
   proto 
   grpc 
   grpc-lwt 
   ocaml-protoc 
   lwt 
   lwt.unix 
   h2 
   h2-lwt-unix 
   domainslib
   yojson
   ppx_jane
   ppx_sexp_conv
   ppx_deriving_yojson
   ppx_deriving
   ppx_deriving_yojson.runtime))

And my types are like this:

type log = {
    mutable command: string;
    mutable term: int32;
    mutable index: int32
} [@@deriving sexp]

I call sexp_of_log in my code like this:

let persist () = Out_channel.write_all "file_name" ~data:(Sexp.to_string (sexp_of_log { command = "hello"; term = (10l); index = (24l); }))

And there's an error when I run dune build: Unbound value "string_of_sexp"

What happens if you add `sexplib` to your libraries in dune? — Chris, Nov 29 '22 at 18:49
Have you shown us all of your code? I don't see a call to `string_of_sexp` in what you've shown. — Chris, Nov 30 '22 at 01:43
@Chris Yes. string is the type of command which is a field of log. — Murphy, Nov 30 '22 at 04:10
You might as well just get rid of those parens. Thy aren't doing anything other than making your source code 4 bytes larger. — Chris, Nov 30 '22 at 21:07

score 0 · Accepted Answer · answered Nov 30 '22 at 15:09

0

I solved this by adding:

open Sexplib.Std

At the top of the file that has the record types deriving sexp.

answered Nov 30 '22 at 15:09

Rawley Fowler

1,366
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1

Alternatively, fully qualify the call to `string_of_sexp` or open the module locally. – Chris Nov 30 '22 at 15:14

Unbound value "string_of_sexp"

1 Answers1