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-rw-r--r--stdlib/callback.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdlib/callback.ml b/stdlib/callback.ml
index 5e19cdbdc..91e396553 100644
--- a/stdlib/callback.ml
+++ b/stdlib/callback.ml
@@ -19,5 +19,5 @@ external register_named_value: string -> Obj.t -> unit = "register_named_value"
let register name v =
register_named_value name (Obj.repr v)
-let register_exception name (exn: exn) =
+let register_exception name (exn : exn) =
register_named_value name (Obj.field (Obj.repr exn) 0)