2 files changed, 6 insertions, 0 deletions
diff --git a/lib/util.ml b/lib/util.ml
index 29edaf3073..ce336ac34c 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -741,6 +741,11 @@ let array_map_left_pair f a g b =
     r, s
   end
 
+let array_iter2 f v1 v2 =
+  let n = Array.length v1 in
+  if Array.length v2 <> n then invalid_arg "array_iter2"
+  else for i = 0 to n - 1 do f v1.(i) v2.(i) done
+
 let pure_functional = false
 
 let array_fold_map' f v e =
diff --git a/lib/util.mli b/lib/util.mli
index 92822f770b..befe844bc8 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -198,6 +198,7 @@ val array_map3 :
 val array_map_left : ('a -> 'b) -> 'a array -> 'b array
 val array_map_left_pair : ('a -> 'b) -> 'a array -> ('c -> 'd) -> 'c array ->
   'b array * 'd array
+val array_iter2 : ('a -> 'b -> unit) -> 'a array -> 'b array -> unit
 val array_fold_map' : ('a -> 'c -> 'b * 'c) -> 'a array -> 'c -> 'b array * 'c
 val array_fold_map2' :
   ('a -> 'b -> 'c -> 'd * 'c) -> 'a array -> 'b array -> 'c -> 'd array * 'c