From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Delivered-To: caml-list@yquem.inria.fr Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by yquem.inria.fr (Postfix) with ESMTP id CF166BB81 for ; Tue, 7 Dec 2004 21:01:20 +0100 (CET) Received: from pauillac.inria.fr (pauillac.inria.fr [128.93.11.35]) by nez-perce.inria.fr (8.13.0/8.13.0) with ESMTP id iB7K1KKf030233 for ; Tue, 7 Dec 2004 21:01:20 +0100 Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id VAA09352 for ; Tue, 7 Dec 2004 21:01:20 +0100 (MET) Received: from postfix4-1.free.fr (postfix4-1.free.fr [213.228.0.62]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id iB7K1J7j020691; Tue, 7 Dec 2004 21:01:20 +0100 Received: from [192.168.0.1] (rkeller-6-82-229-183-156.fbx.proxad.net [82.229.183.156]) by postfix4-1.free.fr (Postfix) with ESMTP id BB346208D32; Tue, 7 Dec 2004 19:09:19 +0100 (CET) Message-ID: <41B5F1B2.3000503@inria.fr> Date: Tue, 07 Dec 2004 19:08:50 +0100 From: Alain Frisch User-Agent: Mozilla Thunderbird 0.8 (X11/20040926) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Damien Doligez Cc: caml users Subject: Re: [Caml-list] Type constraints References: <20041206195527.GA32094@draco.skynet> <41B557D4.2000306@inria.fr> <076FEF06-4856-11D9-8195-000D9345235C@inria.fr> <41B5C4C8.9040701@ps.uni-sb.de> In-Reply-To: X-Enigmail-Version: 0.86.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Miltered: at nez-perce with ID 41B60C10.001 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Miltered: at concorde with ID 41B60C0F.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; frisch:01 frisch:01 caml-list:01 damien:01 wrote:01 struct:01 struct:01 sig:01 val:01 sig:01 val:01 doligez:01 constraints:01 alain:02 alain:02 X-Spam-Checker-Version: SpamAssassin 3.0.0 (2004-09-13) on yquem.inria.fr X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.0.0 X-Spam-Level: Damien Doligez wrote: > Yes, well I simplified it a bit too much. Try this instead: > > let module M = struct let v = ref [] end in M.v;; I still don't understand. Compare: # module M = struct let v = ref [] end;; module M : sig val v : '_a list ref end # module M : sig val v : 'a -> 'a end = struct let v x = x end;; module M : sig val v : 'a -> 'a end Of course, the type variable in the first example must not be generalized, and it isn't. In the second example, there is no problem. We get: # M.v;; - : 'a -> 'a = So why not give the same type scheme to: let module M : sig val v : 'a -> 'a end = struct let v x = x end in M.v ? Alain