2 files changed, 6 insertions, 0 deletions
diff --git a/lib/util.ml b/lib/util.ml
index ee373120e2..8b3fb2428b 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -778,6 +778,11 @@ let option_smartmap f a = match a with
   | None -> a
   | Some x -> let x' = f x in if x'==x then a else Some x'
 
+let rec filter_some = function
+  | [] -> []
+  | None::l -> filter_some l
+  | Some a::l -> a :: filter_some l
+
 let map_succeed f = 
   let rec map_f = function 
     | [] -> []
diff --git a/lib/util.mli b/lib/util.mli
index afa11d31dc..8a406519e8 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -216,6 +216,7 @@ val option_fold_left2 : ('a -> 'b -> 'c -> 'a) -> 'a -> 'b option ->
 val option_iter : ('a -> unit) -> 'a option -> unit
 val option_compare : ('a -> 'b -> bool) -> 'a option -> 'b option -> bool 
 val option_smartmap : ('a -> 'a) -> 'a option -> 'a option
+val filter_some : 'a option list -> 'a list
 
 (* In [map_succeed f l] an element [a] is removed if [f a] raises *)
 (* [Failure _] otherwise behaves as [List.map f l] *)