From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.3 required=5.0 tests=AWL autolearn=disabled version=3.1.3 X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from mail1-relais-roc.national.inria.fr (mail1-relais-roc.national.inria.fr [192.134.164.82]) by yquem.inria.fr (Postfix) with ESMTP id E7AFDBB84 for ; Wed, 14 Jan 2009 09:54:44 +0100 (CET) X-IronPort-AV: E=Sophos;i="4.37,262,1231110000"; d="scan'208";a="22442725" Received: from discorde.inria.fr ([192.93.2.38]) by mail1-smtp-roc.national.inria.fr with ESMTP; 14 Jan 2009 09:54:44 +0100 Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by discorde.inria.fr (8.13.6/8.13.6) with ESMTP id n0E8shPa022279 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Wed, 14 Jan 2009 09:54:44 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AosCADM3bUmK54gDgWdsb2JhbACUGAEBFiK5BIVv X-IronPort-AV: E=Sophos;i="4.37,262,1231110000"; d="scan'208";a="19571468" Received: from rouge.crans.org ([138.231.136.3]) by mail2-smtp-roc.national.inria.fr with ESMTP/TLS/ADH-AES256-SHA; 14 Jan 2009 09:54:43 +0100 Received: from localhost (localhost.crans.org [127.0.0.1]) by rouge.crans.org (Postfix) with ESMTP id 37A5B85C0; Wed, 14 Jan 2009 09:54:43 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at crans.org Received: from rouge.crans.org ([10.231.136.3]) by localhost (rouge.crans.org [10.231.136.3]) (amavisd-new, port 10024) with LMTP id w1WiQGY9rNuO; Wed, 14 Jan 2009 09:54:43 +0100 (CET) Received: from [88.185.141.188] (korell.glondu.net [88.185.141.188]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by rouge.crans.org (Postfix) with ESMTP id C749F84B3; Wed, 14 Jan 2009 09:54:42 +0100 (CET) Message-ID: <496DA852.5040508@glondu.net> Date: Wed, 14 Jan 2009 09:54:42 +0100 From: =?UTF-8?B?U3TDqXBoYW5lIEdsb25kdQ==?= User-Agent: Mozilla-Thunderbird 2.0.0.17 (X11/20081018) MIME-Version: 1.0 To: Radzevich Belevich Cc: Caml List Subject: Re: [Caml-list] why Hashtbl.t are not covarint? References: <1231920145.2711.8.camel@serphost.localdomain> In-Reply-To: <1231920145.2711.8.camel@serphost.localdomain> X-Enigmail-Version: 0.95.0 OpenPGP: id=FCE03DAA Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Miltered: at discorde with ID 496DA854.000 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)! X-Spam: no; 0.00; hashtbl:01 hashtbl:01 mli:01 mutable:01 cheers:01 phane:98 steph:98 phane:98 caml-list:01 covariant:02 things:13 type:14 type:14 ref:16 same:17 Radzevich Belevich a =C3=A9crit : > hashtbl.mli: type ('a,'b) t > Why not "type ('a,+'b) t"? For the same reason as 'a in 'a ref, i.e. mutable things cannot be covariant. Cheers, --=20 St=C3=A9phane