From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by yquem.inria.fr (Postfix) with ESMTP id 9F29FBB81 for ; Wed, 28 Sep 2005 07:08:53 +0200 (CEST) Received: from pauillac.inria.fr (pauillac.inria.fr [128.93.11.35]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id j8S58rQa011610 for ; Wed, 28 Sep 2005 07:08:53 +0200 Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id HAA09243 for ; Wed, 28 Sep 2005 07:08:52 +0200 (MET DST) Received: from kurims.kurims.kyoto-u.ac.jp (kurims.kurims.kyoto-u.ac.jp [130.54.16.1]) by nez-perce.inria.fr (8.13.0/8.13.0) with ESMTP id j8S58o2P000663 for ; Wed, 28 Sep 2005 07:08:51 +0200 Received: from localhost (orion [130.54.16.5]) by kurims.kurims.kyoto-u.ac.jp (8.13.1/8.13.1) with ESMTP id j8S58mcO016813 for ; Wed, 28 Sep 2005 14:08:48 +0900 (JST) Date: Wed, 28 Sep 2005 14:08:48 +0900 (JST) Message-Id: <20050928.140848.68541025.keiko@kurims.kyoto-u.ac.jp> To: caml-list@inria.fr Subject: cyclic type abbreviations From: Keiko Nakata X-Mailer: Mew version 4.2 on Emacs 20.7 / Mule 4.1 (AOI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Miltered: at concorde with ID 433A2565.001 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Miltered: at nez-perce with ID 433A2562.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; -rectypes:01 -rectypes:01 cyclic:01 cyclic:01 latter:03 kyoto-u:10 kurims:10 between:11 but:12 but:12 wonder:12 type:14 type:14 does:14 would:17 X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.0.3 Hello. I wonder how does the type system (without -rectypes) check cyclic type abbreviations. The type system with -rectypes can tell between type 'a t = A of 'a type s = s t and type 'a t = 'a type s = s t It admit the former, but the latter. But, the type system without -rectypes cannot tell them. Why? I thought that the former would be legal without -rectypes. Regards, Keiko NAKATA.