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=0.0 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 mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by yquem.inria.fr (Postfix) with ESMTP id 243BFBB84 for ; Sat, 30 Aug 2008 13:27:21 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhUEAOzKuEhQRFuwiGdsb2JhbACDEY81AQEBDyCiKYFp X-IronPort-AV: E=Sophos;i="4.32,296,1217800800"; d="scan'208";a="16413046" Received: from concorde.inria.fr ([192.93.2.39]) by mail3-smtp-sop.national.inria.fr with ESMTP; 30 Aug 2008 13:27:20 +0200 Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by concorde.inria.fr (8.13.6/8.13.6) with ESMTP id m7UBRGHi029991 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Sat, 30 Aug 2008 13:27:20 +0200 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhUEAOzKuEhQRFuwiGdsb2JhbACDEY81AQEBDyCiKYFp X-IronPort-AV: E=Sophos;i="4.32,296,1217800800"; d="scan'208";a="16413045" Received: from furbychan.cocan.org ([80.68.91.176]) by mail3-smtp-sop.national.inria.fr with ESMTP/TLS/AES256-SHA; 30 Aug 2008 13:27:20 +0200 Received: from rich by furbychan.cocan.org with local (Exim 4.63) (envelope-from ) id 1KZObu-0006cX-Nb for caml-list@inria.fr; Sat, 30 Aug 2008 12:27:18 +0100 Date: Sat, 30 Aug 2008 12:27:18 +0100 To: caml-list@inria.fr Subject: What does underscore mean in this type expression? Message-ID: <20080830112718.GA25303@annexia.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable User-Agent: Mutt/1.5.13 (2006-08-11) From: Richard Jones X-Miltered: at concorde with ID 48B92E94.000 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)! X-Spam: no; 0.00; cmi:01 val:01 bool:01 val:01 bool:01 syntax:01 expression:02 match:02 match:02 underscore:02 underscore:02 character:04 manual:06 long:06 interface:06 I'm seeing this type error. Notice the difference is a lowly underscore character. The implementation libvirt.ml does not match the interface libvirt.cmi: Values do not match: val get_domains : (_[> `R ] as 'a) Connect.t -> ?want_info:bool -> Domain.list_flag list -> 'a Domain.t list * Domain.info list is not included in val get_domains : ([> `R ] as 'a) Connect.t -> ?want_info:bool -> Domain.list_flag list -> 'a Domain.t list * Domain.info list This syntax doesn't appear to be documented in the manual (unless it's related to '_a). What does it mean? I can supply some reproducer code if needed, but the code is rather long at the moment. Rich. --=20 Richard Jones Red Hat