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-rw-r--r--stdlib/queue.mli2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdlib/queue.mli b/stdlib/queue.mli
index 867915bd0..c569ae7dc 100644
--- a/stdlib/queue.mli
+++ b/stdlib/queue.mli
@@ -36,7 +36,7 @@ val clear : 'a t -> unit
(* Discard all elements from a queue. *)
val length: 'a t -> int
(* Return the number of elements in a queue. *)
-val iter: ('a -> unit) -> 'a t -> unit
+val iter: fun:('a -> unit) -> 'a t -> unit
(* [iter f q] applies [f] in turn to all elements of [q],
from the least recently entered to the most recently entered.
The queue itself is unchanged. *)