From: Richard Jones <rich@annexia.org>
To: Jacques GARRIGUE <garrigue@kurims.kyoto-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Optional and mandatory labels with the same name in the same function ?
Date: Thu, 15 Jul 2004 15:23:06 +0100 [thread overview]
Message-ID: <20040715142305.GA14257@redhat.com> (raw)
In-Reply-To: <20040715.231153.68538428.garrigue@kurims.kyoto-u.ac.jp>
On Thu, Jul 15, 2004 at 11:11:53PM +0900, Jacques GARRIGUE wrote:
> Then I suppose that
> let f x x = 33
> should also cause a warning, because this has just the same
> semantics.
It's a bit more subtle than that. OCaml 3.07 always picks the last
argument, and ignores the others. Thus:
# let f x x = x;;
val f : 'a -> 'b -> 'b = <fun>
# let f x x x x = x;;
val f : 'a -> 'b -> 'c -> 'd -> 'd = <fun>
But a future version might pick the first argument, or one in the
middle, or one at random. I can't find any guarantee in the manual
that the behaviour won't change, so this might cause a bug.
Rich.
--
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
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next prev parent reply other threads:[~2004-07-15 14:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-15 11:54 Berke Durak
2004-07-15 14:11 ` Jacques GARRIGUE
2004-07-15 14:23 ` Richard Jones [this message]
2004-07-15 14:49 ` Jacques GARRIGUE
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