From: Alain Frisch <Alain.Frisch@inria.fr>
To: Jim Farrand <jim@farrand.net>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Type constraints
Date: Tue, 07 Dec 2004 08:12:20 +0100 [thread overview]
Message-ID: <41B557D4.2000306@inria.fr> (raw)
In-Reply-To: <20041206195527.GA32094@draco.skynet>
Jim Farrand wrote:
> Hi,
> The problem is that the type constraint generated,
>
> ((fun x -> x) : 'a -> 'a)
>
> does not reject values with a less general type. This is fine when the
> type given matches the function, as it does above, but causes me
> problems if the type given is less general.
Maybe you can use local structures and signatures:
(e :: s) ==>
let module M : sig val v : s end = struct let v = e end in M.v;;
where s is a type scheme.
Btw, does someone know why in
# let module M : sig val v: 'a -> 'a end = struct let v x = x end in M.v;;
- : '_a -> '_a = <fun>
the type variable is not generalized ?
-- Alain
next prev parent reply other threads:[~2004-12-07 7:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-06 19:55 Jim Farrand
2004-12-07 7:12 ` Alain Frisch [this message]
2004-12-07 13:43 ` [Caml-list] " Damien Doligez
2004-12-07 14:57 ` Andreas Rossberg
2004-12-07 17:44 ` Damien Doligez
2004-12-07 18:08 ` Alain Frisch
2004-12-07 21:04 ` Damien Doligez
2004-12-07 21:43 ` Alain Frisch
2004-12-08 3:30 ` nakata keiko
[not found] ` <8002B033-4906-11D9-8195-000D9345235C@inria.fr>
2004-12-09 0:56 ` nakata keiko
2004-12-09 1:27 ` Jacques Garrigue
2004-12-08 10:53 ` Damien Doligez
2004-12-08 12:39 ` Alain Frisch
2004-12-08 14:23 ` Jacques Garrigue
2004-12-09 3:07 ` skaller
2004-12-09 4:53 ` Jacques Garrigue
2004-12-08 16:10 ` Xavier Leroy
2004-12-07 18:13 ` William Lovas
2004-12-08 0:27 ` Jacques Garrigue
2004-12-07 18:41 ` Boris Yakobowski
2004-12-07 19:38 ` Jim Farrand
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