From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Mark H Weaver Newsgroups: gmane.lisp.guile.bugs Subject: bug#30145: [PATCH] doc: Document undefined?. Date: Sun, 21 Jan 2018 09:33:40 -0500 Message-ID: <871sijnuwr.fsf@netris.org> References: <20180117175204.1381-1-arunisaac@systemreboot.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1516545330 19416 195.159.176.226 (21 Jan 2018 14:35:30 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 21 Jan 2018 14:35:30 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) Cc: 30145@debbugs.gnu.org To: Arun Isaac Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Sun Jan 21 15:35:26 2018 Return-path: Envelope-to: guile-bugs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1edGiF-0003wq-Pf for guile-bugs@m.gmane.org; Sun, 21 Jan 2018 15:35:11 +0100 Original-Received: from localhost ([::1]:59615 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1edGkF-0005ns-Sg for guile-bugs@m.gmane.org; Sun, 21 Jan 2018 09:37:15 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37280) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1edGk6-0005ni-Uc for bug-guile@gnu.org; Sun, 21 Jan 2018 09:37:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1edGk2-0003Br-Sq for bug-guile@gnu.org; Sun, 21 Jan 2018 09:37:06 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:57015) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1edGk2-0003BV-PM for bug-guile@gnu.org; Sun, 21 Jan 2018 09:37:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1edGk2-0006Ks-Ah for bug-guile@gnu.org; Sun, 21 Jan 2018 09:37:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-CC: bug-guile@gnu.org Resent-Date: Sun, 21 Jan 2018 14:37:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 30145 X-GNU-PR-Package: guile X-GNU-PR-Keywords: patch Original-Received: via spool by 30145-submit@debbugs.gnu.org id=B30145.151654537124298 (code B ref 30145); Sun, 21 Jan 2018 14:37:02 +0000 Original-Received: (at 30145) by debbugs.gnu.org; 21 Jan 2018 14:36:11 +0000 Original-Received: from localhost ([127.0.0.1]:36679 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1edGjD-0006Jq-3C for submit@debbugs.gnu.org; Sun, 21 Jan 2018 09:36:11 -0500 Original-Received: from world.peace.net ([50.252.239.5]:41504) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1edGjB-0006Jb-TA for 30145@debbugs.gnu.org; Sun, 21 Jan 2018 09:36:10 -0500 Original-Received: from [98.216.255.118] (helo=yeeloong) by world.peace.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1edGj5-0007VP-Lc; Sun, 21 Jan 2018 09:36:03 -0500 In-Reply-To: <20180117175204.1381-1-arunisaac@systemreboot.net> (Arun Isaac's message of "Wed, 17 Jan 2018 23:22:04 +0530") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Original-Sender: "bug-guile" Xref: news.gmane.org gmane.lisp.guile.bugs:8974 Archived-At: Arun Isaac writes: > * doc/ref/data-rep.texi: Document undefined?. Is 'undefined?' a procedure in your Guile? It's not available at my Guile REPL,and I can't find a single occurrence of 'undefined?' in my guile stable-2.2 git checkout. There is a special SCM_UNDEFINED value at the C level, but it's only used for a couple of internal purposes and not usable from Scheme at all. FYI, the two internal purposes are these: (1) if SCM_UNDEFINED is passed as an optional argument to a Scheme procedure implemented in C, this indicates that the optional argument was not actually present. (2) if SCM_UNDEFINED is stored in a top-level variable object, that indicates that the variable is no longer bound, i.e. it was actually removed. Mark