Hi,

I've been using Sexplib quite extensively.  The syntax extension makes adding
(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 syntax
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 = [ `A of int | `B of Foobar.bar_t ] with sexp
        type bar_t = [ `C of int | `D of Foobar.foo_t ] with sexp
        type foobar_t = [ foo_t | bar_t ] with sexp

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

        type (+'a, 'b) t = Foobar of 'a constraint 'a = [< foobar_t ] with sexp
end



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