I reported this a couple of years ago:
http://caml.inria.fr/mantis/view.php?id=4904


On Tue, Sep 17, 2013 at 2:55 PM, Török Edwin <edwin+ml-ocaml@etorok.net>wrote:

> Hi,
>
> The following is accepted:
>
> let foo ~x ~x () = ()
> let () =
>   foo ~x:4 ~x:5 ()
>
> I tried -w A and I got no warnings with OCaml 4.01.0, is this intended?
> Should I file a feature request to get a warning for this situation?
>
> (How I got in this situation: I did an overly eager search/replace that
> caused the duplicate ~x)
>
> Best regards,
> --Edwin
>
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