From: Sven LUTHER <luther@dpt-info.u-strasbg.fr>
To: Chris Hecker <checker@d6.com>
Cc: caml-list@inria.fr
Subject: Re: anonymous function + lable bug?
Date: Tue, 7 Nov 2000 14:40:55 +0100 [thread overview]
Message-ID: <20001107144055.C30034@lambda.u-strasbg.fr> (raw)
In-Reply-To: <4.3.2.7.2.20001105044616.00ababc0@shell16.ba.best.com>; from checker@d6.com on Sun, Nov 05, 2000 at 05:11:11AM -0800
On Sun, Nov 05, 2000 at 05:11:11AM -0800, Chris Hecker wrote:
>
> Is this a bug?
>
> # let f = fun ~x -> x;;
> val f : x:'a -> 'a = <fun>
>
> # let g = function ~x -> x;;
> Characters 17-18:
> Syntax error
>
> I thought these two were equivalent?
No, function has only one argument, and can do more kind of polymorphism than
fun which can take more than one argument as in :
let f = fun x y z -> x + y + z
f 5 6 7 evaluates to 18.
I think the use of function is preferable over fun, which is there for
compatibility reasons.
not sure what the ~ does, i think it is one of the label stuffs.
Try :
# let f ~x = x ;;
val f : x:'a -> 'a = <fun>
Don't know why there is a problem with the above though.
Friendly,
Sven Luther
next prev parent reply other threads:[~2000-11-08 17:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-05 13:11 Chris Hecker
2000-11-07 2:52 ` Jacques Garrigue
2000-11-07 19:03 ` Chris Hecker
2000-11-08 1:01 ` Jacques Garrigue
2000-11-07 13:40 ` Sven LUTHER [this message]
2000-11-08 19:14 ` Chris Hecker
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