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-rw-r--r--lib/hashcons.mli6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/hashcons.mli b/lib/hashcons.mli
index 2f86174b2..ae7d6b9d9 100644
--- a/lib/hashcons.mli
+++ b/lib/hashcons.mli
@@ -91,5 +91,11 @@ val recursive2_hcons :
module Hstring : (S with type t = string and type u = unit)
(** Hashconsing of strings. *)
+module type SomeData = sig type t end
+
+module Hlist (D:SomeData) :
+ (S with type t = D.t list and type u = (D.t list -> D.t list)*(D.t->D.t))
+(** Hashconsing of lists. *)
+
module Hobj : (S with type t = Obj.t and type u = (Obj.t -> Obj.t) * unit)
(** Hashconsing of OCaml values. *)