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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
type t = Obj.t
let obj = Obj.new_block Obj.closure_tag 0
(** This is an empty closure block. In the current implementation, it is
sufficient to allow marshalling but forbid equality. Sadly still allows
hash. *)
(** FIXME : use custom blocks somehow. *)
module type Obj = sig type t end
module Make(M : Obj) =
struct
type canary = t
type t = (canary * M.t)
let prj (_, x) = x
let inj x = (obj, x)
end
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