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 5A409BC8A for ; Sun, 30 Jan 2005 07:05:25 +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 j0U65OV8020194 for ; Sun, 30 Jan 2005 07:05:25 +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 HAA02673 for ; Sun, 30 Jan 2005 07:05:24 +0100 (MET) Received: from rproxy.gmail.com (rproxy.gmail.com [64.233.170.203]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id j0U65N9c025688 for ; Sun, 30 Jan 2005 07:05:24 +0100 Received: by rproxy.gmail.com with SMTP id i8so161996rne for ; Sat, 29 Jan 2005 22:05:23 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=dGVz3PowQ7tVRj+rY0dNfRi/r37QyBY6Ju2nJTohOdcGrNsPB4XrWAlp3ciIB+wXj/gMUrYLKK11wc2YJuJaRJ1rr+03AE3NfJlSUsocAxlAXlTtgl/dI5veHBAAQFkiGMQYctVoh2AEoSOWUk/XpnW2RapdYpHN/BHp4r1GdTQ= Received: by 10.38.150.75 with SMTP id x75mr38128rnd; Sat, 29 Jan 2005 22:05:23 -0800 (PST) Received: by 10.38.65.58 with HTTP; Sat, 29 Jan 2005 22:05:23 -0800 (PST) Message-ID: <7f8e92aa050129220540e72c6d@mail.gmail.com> Date: Sun, 30 Jan 2005 08:05:23 +0200 From: Radu Grigore Reply-To: Radu Grigore To: Damien Doligez Subject: Re: [Caml-list] cyclic types Cc: caml-list In-Reply-To: <1F350A61-7250-11D9-866D-000D9345235C@inria.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <7f8e92aa0501290415321a8e46@mail.gmail.com> <6b8a914205012905427c79cd85@mail.gmail.com> <7f8e92aa05012909335800c97@mail.gmail.com> <1F350A61-7250-11D9-866D-000D9345235C@inria.fr> X-Miltered: at nez-perce with ID 41FC7925.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Miltered: at concorde with ID 41FC7923.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; caml-list:01 damien:01 damien:01 wrote:01 iirc:01 abbreviation:01 doligez:01 doligez:01 cyclic:01 cyclic:01 expressive:01 types:02 increment:03 problem:05 radu:05 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=RCVD_BY_IP autolearn=disabled version=3.0.0 X-Spam-Level: On Sun, 30 Jan 2005 00:47:23 +0100, Damien Doligez wrote: > IIRC, rectypes are off by default because they trade a small increment > in expressive power for a large degradation of the intelligibility of > type-checking error messages. I don't think they are dangerous in the > sense of breaking the type system. Thank you. Only one (small) problem remains. I do not understand this: # type t = t StringMap.t option;; The type abbreviation t is cyclic # type t = Some of t StringMap.t | None;; type t = Some of t StringMap.t | None -- regards, radu http://rgrig.idilis.ro/