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#29520: peval leaves behind dangling lexical reference Date: Mon, 04 Dec 2017 16:10:00 -0500 Message-ID: <87wp22w66v.fsf@netris.org> References: <87shcrxyat.fsf@netris.org> <87mv2zxqym.fsf@netris.org> <878tejxd76.fsf@netris.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1512421874 5584 195.159.176.226 (4 Dec 2017 21:11:14 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 4 Dec 2017 21:11:14 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) Cc: 29520@debbugs.gnu.org To: Stefan Israelsson Tampe Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Mon Dec 04 22:11:10 2017 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 1eLy14-00013x-1F for guile-bugs@m.gmane.org; Mon, 04 Dec 2017 22:11:06 +0100 Original-Received: from localhost ([::1]:45233 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eLy1B-0004Tw-7e for guile-bugs@m.gmane.org; Mon, 04 Dec 2017 16:11:13 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:47613) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eLy15-0004Td-H4 for bug-guile@gnu.org; Mon, 04 Dec 2017 16:11:08 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eLy10-00010j-AE for bug-guile@gnu.org; Mon, 04 Dec 2017 16:11:07 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:37327) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eLy10-00010b-6H for bug-guile@gnu.org; Mon, 04 Dec 2017 16:11:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1eLy0z-0007Ax-LA for bug-guile@gnu.org; Mon, 04 Dec 2017 16:11:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-CC: bug-guile@gnu.org Resent-Date: Mon, 04 Dec 2017 21:11:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 29520 X-GNU-PR-Package: guile X-GNU-PR-Keywords: Original-Received: via spool by 29520-submit@debbugs.gnu.org id=B29520.151242182627539 (code B ref 29520); Mon, 04 Dec 2017 21:11:01 +0000 Original-Received: (at 29520) by debbugs.gnu.org; 4 Dec 2017 21:10:26 +0000 Original-Received: from localhost ([127.0.0.1]:46008 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eLy0Q-0007A7-IY for submit@debbugs.gnu.org; Mon, 04 Dec 2017 16:10:26 -0500 Original-Received: from world.peace.net ([50.252.239.5]:35550) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eLy0P-00079v-2Y for 29520@debbugs.gnu.org; Mon, 04 Dec 2017 16:10:25 -0500 Original-Received: from pool-72-93-29-217.bstnma.east.verizon.net ([72.93.29.217] helo=jojen) by world.peace.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1eLy0J-0008Q8-2I; Mon, 04 Dec 2017 16:10:19 -0500 In-Reply-To: <878tejxd76.fsf@netris.org> (Mark H. Weaver's message of "Mon, 04 Dec 2017 00:41:01 -0500") 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:8926 Archived-At: Mark H Weaver writes: > Mark H Weaver writes: > >> I believe the problem is most likely in 'lift-applied-lambda' in >> peval.scm. When transforming: >> >> (lambda args (apply (lambda ...) args)) => (lambda ...) >> >> it does not appear to check whether 'args' is referenced within the >> inner lambda. It occurs to me that there's another problem with this optimization: scheme@(guile-user)> ,optimize (lambda (x y . z) (apply (lambda x x) x y z)) $1 = (lambda x x) This optimization changes the arity of the procedure. The original version checks that at least 2 arguments are provided, and ensures that at least 2 arguments are passed to the inner procedure, which the code might depend on. The optimization effectively removes this check. I'll look into how to fix this. Mark