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Date: Fri, 25 Jul 2008 05:31:09 -0700 (PDT)
From: Dario Teixeira <darioteixeira@yahoo.com>
Subject: Sexplib and types defined via constraint
To: caml-list@yquem.inria.fr
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X-Spam: no; 0.00; extensively:01 syntax:01 syntax:01 foobar:01 sig:01 foo:01 foobar:01 sexp:01 foo:01 sexp:01 struct:01 rec:01 functions:01 functions:01 constraint:01 

Hi,

I've been using Sexplib quite extensively.  The syntax extension makes addi=
ng
(de)serialisation functions very simple and convenient, and up till now it
has automatically handled every data structure I threw at it.

But consider the module fragment below; type t is defined via a constraint,
and includes a type parameter ('b) used as a phantom type.  The Sexplib syn=
tax
extension fails to parse the definition of t, producing an error:

Failure: "get_tparam_id: not a type parameter"
Preprocessing error on file document.ml

Is this a known limitation of Sexplib, in which case the (de)serialization
functions for t must be built manually?

Thanks in advance,
Dario Teixeira


module rec Foobar:
sig
        type foo_t =3D [ `A of int | `B of Foobar.bar_t ] with sexp
        type bar_t =3D [ `C of int | `D of Foobar.foo_t ] with sexp
        type foobar_t =3D [ foo_t | bar_t ] with sexp

        type (+'a, 'b) t =3D private Foobar of 'a constraint 'a =3D [< foob=
ar_t ] with sexp
end =3D
struct
        type foo_t =3D [ `A of int | `B of Foobar.bar_t ] with sexp
        type bar_t =3D [ `C of int | `D of Foobar.foo_t ] with sexp
        type foobar_t =3D [ foo_t | bar_t ] with sexp

        type (+'a, 'b) t =3D Foobar of 'a constraint 'a =3D [< foobar_t ] w=
ith sexp
end
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