1 files changed, 5 insertions, 0 deletions
diff --git a/lib/util.ml b/lib/util.ml
index 1bb69bf323..6632beaf29 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -501,6 +501,11 @@ let option_app f = function
   | None -> None
   | Some x -> Some (f x)
 
+let option_compare f a b = match (a,b) with
+  | None, None -> true
+  | Some a', Some b' -> f a' b'
+  | _ -> failwith "option_compare"
+
 let map_succeed f = 
   let rec map_f = function 
     | [] -> []