From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.user Subject: Re: set-current-module in .guile ? Date: Wed, 09 Apr 2008 17:05:19 +0200 Message-ID: <87lk3nhxw0.fsf@gnu.org> References: <18423.46537.161648.253613@entangle.lvc.edu> <47F7E878.20609@wilsonjc.us> <87iqyvrpwj.fsf@gnu.org> <87ve2unnia.fsf@gnu.org> <87fxtxrdhw.fsf@gnu.org> <18426.14519.36960.278300@entangle.lvc.edu> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1207753604 22256 80.91.229.12 (9 Apr 2008 15:06:44 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 9 Apr 2008 15:06:44 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Wed Apr 09 17:07:16 2008 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1Jjbsb-00031G-C1 for guile-user@m.gmane.org; Wed, 09 Apr 2008 17:06:29 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Jjbrx-0000Q7-So for guile-user@m.gmane.org; Wed, 09 Apr 2008 11:05:49 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Jjbrs-0000Pc-02 for guile-user@gnu.org; Wed, 09 Apr 2008 11:05:44 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Jjbrq-0000PO-0V for guile-user@gnu.org; Wed, 09 Apr 2008 11:05:43 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Jjbrp-0000PL-RW for guile-user@gnu.org; Wed, 09 Apr 2008 11:05:41 -0400 Original-Received: from main.gmane.org ([80.91.229.2] helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1Jjbrp-0000ay-3j for guile-user@gnu.org; Wed, 09 Apr 2008 11:05:41 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1Jjbrf-00057r-G1 for guile-user@gnu.org; Wed, 09 Apr 2008 15:05:31 +0000 Original-Received: from 193.50.110.109 ([193.50.110.109]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 09 Apr 2008 15:05:31 +0000 Original-Received: from ludo by 193.50.110.109 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 09 Apr 2008 15:05:31 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 39 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 193.50.110.109 X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 21 Germinal an 216 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEB1F5364 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) Cancel-Lock: sha1:OU99fuK8XUI7472l2QOpZATK+aw= X-detected-kernel: by monty-python.gnu.org: Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:6529 Archived-At: Hi, I can reproduce the problem now, with Guile 1.8 and SLIB 3a5. "Scott N. Walck" writes: > [walck@entangle:~]$ guile > guile> (load "/usr/local/src/guile-scmutils/src/load.scm") > guile> (module-use! (current-module) generic-environment) > #f > guile> + > # > guile> (+ (vector 5 6) (vector 7 8)) > Segmentation fault (core dumped) That's because there's a circular reference in the modules: guile> (module-uses generic-environment) (#) guile> (current-module) # IOW, `generic-environment' uses `(guile-user)' (the default module that's used when one get to the REPL), and the `module-use!' line above makes `(guile-user)' use `generic-environment'. Thus, further variable lookups that are not satisfied by either module are bound to fail: the `module_variable ()' function in `modules.c' looks for the variable in `(guile-user)', then in `generic-environment', then in `(guile-user)', and so on. This should be reported as a `guile-scmutils' bug. One possibility is to fix the way `generic-environment' is created in `kernel/genenv.scm'. Guile-scmutils should really use modules in a more orthodox way rather than expect users to fiddle with `set-current-module', `module-use!', etc. Thanks, Ludovic.