Re: [Caml-list] Fwd: Toplevel and syntax extension.

[Philippe Veber <philippe.veber@gmail.com>]

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Thanks David!

The first call fails with a syntax error on "with sexp":

[pbil:~ 18:58]$cat rien.ml
let () =
  try Topdirs.dir_directory (Sys.getenv "OCAML_TOPLEVEL_PATH")
  with Not_found -> ()
;;

#use "topfind";;
#camlp4o;;
#require " sexplib.syntax";;

open Sexplib.Std;;

type t = int with sexp;;

[pbil:~ 18:58]$ocaml rien.ml
File "rien.ml", line 12, characters 13-17:
Error: Syntax error

It seems like the sexp syntax extension is not loaded when the script is
evaluated. But it's not really clear to me what going wrong...

Cheers!
ph.



2014-07-01 18:51 GMT+02:00 David Sheets <sheets@alum.mit.edu>:

> On Tue, Jul 1, 2014 at 5:38 PM, Philippe Veber <philippe.veber@gmail.com>
> wrote:
> > Reposting this question here, just in case.
> >
> > ---------- Forwarded message ----------
> > From: Philippe Veber <philippe.veber@gmail.com>
> > Date: 2014-06-28 21:32 GMT+02:00
> > Subject: Toplevel and syntax extension.
> > To: ocaml_beginners@yahoogroups.com
> >
> >
> > Dear camlers,
> >
> > Consider the following script:
> >
> > #use "topfind";;
> > #camlp4o;;
> > #require "sexplib.syntax";;
> >
> > open Sexplib.Std;;
> >
> > type t = int with sexp;;
> >
> > Saved as script.ml, the simple call:
> >
> > ocaml script.ml
> >
> > fails while the call:
> >
> > cat script.ml | ocaml
> >
> > succeeds. Any idea how I could fix the first call?
>
> How does the first call fail? A difference between the two is that, in
> the second, the .ocamlinit file is used. If you are using opam with
> ocamlfind installed via it, this file will contain your Topdirs setup.
> You can try:
>
> let () =
>   try Topdirs.dir_directory (Sys.getenv "OCAML_TOPLEVEL_PATH")
>   with Not_found -> ()
> ;;
>
> at the top of your script (after hashbang but before directives).
>
> Hope this helps,
>
> David
>

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