From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: David Kastrup Newsgroups: gmane.lisp.guile.bugs Subject: bug#18223: And here's direct proof that the doc is wrong: Date: Sat, 09 Aug 2014 12:20:28 +0200 Message-ID: <8761i27ymr.fsf@fencepost.gnu.org> References: <1407505351-26741-1-git-send-email-dak@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1407579675 28786 80.91.229.3 (9 Aug 2014 10:21:15 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 9 Aug 2014 10:21:15 +0000 (UTC) To: 18223@debbugs.gnu.org Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Sat Aug 09 12:21:07 2014 Return-path: Envelope-to: guile-bugs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XG3lr-0006vD-Je for guile-bugs@m.gmane.org; Sat, 09 Aug 2014 12:21:07 +0200 Original-Received: from localhost ([::1]:55241 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XG3lr-0006Rj-5m for guile-bugs@m.gmane.org; Sat, 09 Aug 2014 06:21:07 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48533) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XG3ln-0006RT-JO for bug-guile@gnu.org; Sat, 09 Aug 2014 06:21:04 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XG3lm-0004EY-O0 for bug-guile@gnu.org; Sat, 09 Aug 2014 06:21:03 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:57392) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XG3lm-0004E4-L5 for bug-guile@gnu.org; Sat, 09 Aug 2014 06:21:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1XG3lm-0001vD-8n for bug-guile@gnu.org; Sat, 09 Aug 2014 06:21:02 -0400 X-Loop: help-debbugs@gnu.org In-Reply-To: <1407505351-26741-1-git-send-email-dak@gnu.org> Resent-From: David Kastrup Original-Sender: "Debbugs-submit" Resent-CC: bug-guile@gnu.org Resent-Date: Sat, 09 Aug 2014 10:21:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18223 X-GNU-PR-Package: guile X-GNU-PR-Keywords: patch Original-Received: via spool by 18223-submit@debbugs.gnu.org id=B18223.14075796337329 (code B ref 18223); Sat, 09 Aug 2014 10:21:02 +0000 Original-Received: (at 18223) by debbugs.gnu.org; 9 Aug 2014 10:20:33 +0000 Original-Received: from localhost ([127.0.0.1]:36102 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XG3lI-0001u9-Jy for submit@debbugs.gnu.org; Sat, 09 Aug 2014 06:20:33 -0400 Original-Received: from fencepost.gnu.org ([208.118.235.10]:35838 ident=Debian-exim) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XG3lE-0001tz-RI for 18223@debbugs.gnu.org; Sat, 09 Aug 2014 06:20:30 -0400 Original-Received: from localhost ([127.0.0.1]:43145 helo=lola) by fencepost.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XG3lE-0005qa-DP for 18223@debbugs.gnu.org; Sat, 09 Aug 2014 06:20:28 -0400 Original-Received: by lola (Postfix, from userid 1000) id 0D7B3DF8C9; Sat, 9 Aug 2014 12:20:28 +0200 (CEST) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+guile-bugs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.bugs:7528 Archived-At: scheme@(guile-user)> (define wooziness (make-object-property)) scheme@(guile-user)> (set! (wooziness 5) #t) $1 = #t scheme@(guile-user)> (wooziness 5) $2 = #t scheme@(guile-user)> (set! (wooziness 1000000000000000000) #t) $3 = #t scheme@(guile-user)> (wooziness 1000000000000000000) $4 = #f scheme@(guile-user)> The property persists for 5 and evaporates for 1000000000000000000. There is no reliable way to know whether it will persist for numbers. And since Guile refuses to commit to guaranteeing (lambda (x) (eq? x x)) to return #t when x may be a number and since there is no guarantee just which numbers may be represented by immediate values, there is no context in which an object property on a number may safely be retrieved. -- David Kastrup