fix PR#76

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@3027 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

otherlibs/db/db.ml

@@ -106,14 +106,10 @@ let find_all db x =
 let remove db x = del db x []
 
 let iter f db =
-  let rec walk k =
-    let k, v = seq db k [R_NEXT] in
-    f k v;
-    walk k
+  let rec walk = function
+      None -> ()
+    | Some(k, v) ->
+        f k v;
+        walk (try Some(seq db k [R_NEXT]) with Not_found -> None)
   in
-  try
-    let k, v = seq db "" [R_FIRST] in
-    f k v;
-    walk k
-  with
-    Not_found -> ()
+  walk (try Some(seq db "" [R_FIRST]) with Not_found -> None)

otherlibs/dbm/dbm.ml

@@ -48,12 +48,10 @@ let _ = Callback.register_exception "dbmerror" (Dbm_error "")
 
 (* Usual iterator *)
 let iter f t =
-  let rec walk k = 
-    f k (find t k); 
-    match try Some(nextkey t) with Not_found -> None
-    with
-         None -> ()
-       | Some k -> walk k
+  let rec walk = function
+      None -> ()
+    | Some k ->
+        f k (find t k); 
+        walk (try Some(nextkey t) with Not_found -> None)
   in
-  walk (firstkey t)
-
+  walk (try Some(firstkey t) with Not_found -> None)