From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Christopher Howard Newsgroups: gmane.lisp.guile.user Subject: Re: underscores in debug output? Date: Wed, 30 Aug 2017 07:13:48 -0800 Message-ID: <1504106028.20412.3.camel@zoho.com> References: <1504065406.20412.1.camel@zoho.com> <87bmmxun8t.fsf@gmail.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1504106076 9314 195.159.176.226 (30 Aug 2017 15:14:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 30 Aug 2017 15:14:36 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Wed Aug 30 17:14:28 2017 Return-path: Envelope-to: guile-user@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 1dn4hD-0001pk-Uu for guile-user@m.gmane.org; Wed, 30 Aug 2017 17:14:24 +0200 Original-Received: from localhost ([::1]:51100 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dn4hK-0004he-Tv for guile-user@m.gmane.org; Wed, 30 Aug 2017 11:14:30 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58979) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dn4gq-0004g8-5I for guile-user@gnu.org; Wed, 30 Aug 2017 11:14:01 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dn4gk-0001gG-FQ for guile-user@gnu.org; Wed, 30 Aug 2017 11:14:00 -0400 Original-Received: from sender-pp-091.zoho.com ([135.84.80.236]:25077) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dn4gk-0001fa-5Y for guile-user@gnu.org; Wed, 30 Aug 2017 11:13:54 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zapps768; d=zoho.com; h=message-id:subject:from:to:date:in-reply-to:references:content-type:mime-version; b=E0HIW4rRwl+NpvI2nqy5xPNryUDvOVwLEj+vViumEo3Bva7DmLljnevi378B7+DiyUOCjPINHX2H p9VbdySEr818Ab/jvrqHR8ILw42ZIC40ADPAbtub7C1WXRfUWziS Original-Received: from nightshade (94-179-223-66.gci.net [66.223.179.94]) by mx.zohomail.com with SMTPS id 1504106030205160.17301850522574; Wed, 30 Aug 2017 08:13:50 -0700 (PDT) In-Reply-To: <87bmmxun8t.fsf@gmail.com> X-Mailer: Evolution 3.22.6-1 X-ZohoMailClient: External X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 135.84.80.236 X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Original-Sender: "guile-user" Xref: news.gmane.org gmane.lisp.guile.user:14082 Archived-At: Ok, okay. Is there some way to affect that? Perhaps I have to use some debug printing or stop points to see those values? On Wed, 2017-08-30 at 22:46 +0800, Alex Vong wrote: > Christopher Howard writes: >=20 > > Hi, what does the underscore character mean in this debug output? > >=20 > > =C2=A0=C2=A0=C2=A0159:37=C2=A0=C2=A05 (delete ((3 . "c") (((2 . "b") ((= )) 1) (5 . "e") (()) > > 1) > > 2) 2) > > =C2=A0=C2=A0=C2=A0163:49=C2=A0=C2=A04 (delete ((2 . "b") (()) 1) _) > > =C2=A0=C2=A0=C2=A0=C2=A0152:9=C2=A0=C2=A03 (delete _ _) > > =C2=A0=C2=A0=C2=A0=C2=A086:11=C2=A0=C2=A02 (skew _) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A064:6=C2=A0=C2=A01 (horizontal-left-link? = _) > > =C2=A0=C2=A0=C2=A0=C2=A046:11=C2=A0=C2=A00 (left-tree _) > >=20 > > Knowing the value of those parameters would be super helpful here, > > but > > for some reason they have been replaced by underscores. >=20 > My guess would be that those values are being garbage-collected. > Since _ > is the pattern for matching an arbitary value, it is used to denote a > garbage-collected value.