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-rw-r--r--library/lib.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/lib.ml b/library/lib.ml
index 23d334a5d..7554fd0bb 100644
--- a/library/lib.ml
+++ b/library/lib.ml
@@ -539,7 +539,7 @@ let close_section () =
(*****************)
(* Backtracking. *)
-let (inLabel,outLabel) =
+let (inLabel : int -> obj), (outLabel : obj -> int) =
declare_object_full {(default_object "DOT") with
classify_function = (fun _ -> Dispose)}