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 nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by yquem.inria.fr (Postfix) with ESMTP id 5FCB4BBBC for ; Fri, 17 Mar 2006 10:55:27 +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 k2H9tQDG005336 for ; Fri, 17 Mar 2006 10:55:26 +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 KAA19446 for ; Fri, 17 Mar 2006 10:55:25 +0100 (MET) Received: from kurims.kurims.kyoto-u.ac.jp (kurims.kurims.kyoto-u.ac.jp [130.54.16.1]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id k2H9tNAe031890 for ; Fri, 17 Mar 2006 10:55:25 +0100 Received: from localhost (suiren [130.54.16.25]) by kurims.kurims.kyoto-u.ac.jp (8.13.1/8.13.1) with ESMTP id k2H9tAZU027575; Fri, 17 Mar 2006 18:55:10 +0900 (JST) Date: Fri, 17 Mar 2006 18:55:07 +0900 (JST) Message-Id: <20060317.185507.03978259.garrigue@math.nagoya-u.ac.jp> To: jhw@conjury.org Cc: caml-list@inria.fr Subject: Re: [Caml-list] spurious warning? "polymorphic method not principal" From: Jacques Garrigue In-Reply-To: References: X-Mailer: Mew version 4.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Miltered: at nez-perce with ID 441A878E.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Miltered: at concorde with ID 441A878B.002 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; woodyatt:01 jhw:01 'self:01 printf:01 printf:01 val:01 initialized:01 initialized:01 ocamlc:01 -principal:01 confuses:01 bug:01 bug:01 compiler:01 charlie:98 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 From: j h woodyatt > > (* test.ml *) > > class alfa = object(_:'self) > > method x: 'a. ('a, out_channel, unit) format -> 'a = Printf.printf > > end > > > > class bravo a = object > > val y: alfa = (a :> alfa) > > initializer y#x "bravo initialized" > > end > > > > class charlie a = object > > inherit bravo a > > initializer y#x "charlie initialized" > > end > > $ ocamlc -principal -o test test.ml > File "test.ml", line 13, characters 14-17: > Warning X: this use of a polymorphic method is not principal. > > It warns about the use of the polymorphic method on the object in the > membership of the base class, but only when it's invoked from the > derived class. This confuses me. Is this a bug in my code? No, this is a bug in the compiler. I'll try to fix it. Jacques Garrigue