From: "Eric C. Cooper" <ecc@cmu.edu>
To: caml-list@inria.fr
Subject: Re: [Caml-list] mystified by typing of optional arguments
Date: Thu, 3 Apr 2003 10:08:49 -0500 [thread overview]
Message-ID: <20030403150849.GA1919@ecooper.com> (raw)
In-Reply-To: <A5D19256-65E3-11D7-8811-000A95773ED2@rouaix.org>
On Thu, Apr 03, 2003 at 04:50:44PM +0200, Francois Rouaix wrote:
> The following example mystifies me
>
> let f ?opt x =
> match opt with
> | None -> x
> | Some dx -> x + dx
>
> let g x = x + 1
>
> let h1 = function
> | 0 -> [g]
> | _ -> [f; g]
>
>
> let h2 = function
> | _ -> [f; g]
>
>
> h1 is typable but not h2.
> Why is that ?
Even simpler: [g; f] type-checks, but [f; g] does not.
--
Eric C. Cooper e c c @ c m u . e d u
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next prev parent reply other threads:[~2003-04-03 15:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-03 14:50 Francois Rouaix
2003-04-03 15:04 ` Francois Thomasset
2003-04-03 15:05 ` Ville-Pertti Keinonen
2003-04-03 15:08 ` Eric C. Cooper [this message]
2003-04-03 15:13 ` Jacques Carette
2003-04-04 0:36 ` Jacques Garrigue
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