GNU bug report logs - #32506
27.0.50; loop regression

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; loop regression
Date: Thu, 23 Aug 2018 09:17:12 +0200

With Emacs25 this

(require 'cl)

(defun foo (vector)
  (loop for i from -1
	for exp = 0 then (list exp e i)
	for e across vector
	finally (return exp)))

(assert (equal (foo [a b]) '((0 a 0) b 1)))

works as it should.  With the current Emacs version (foo [a b])
incorrectly returns (0 a 0).



In GNU Emacs 27.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2018-08-23 built on caladan
Repository revision: a4a3c92e9de59bd0251f36326375cce898919edc
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)

Configured using:
 'configure --with-xpm=no --with-gif=no --with-tiff=no --with-jpeg=no
 --without-pop'

Configured features:
PNG SOUND DBUS GSETTINGS NOTIFY GNUTLS LIBXML2 FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD GMP

Important settings:
  value of $LANG: C.UTF-8
  locale-coding-system: utf-8-unix

Message #10 received at 32506 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Helmut Eller <eller.helmut <at> gmail.com>
Cc: 32506 <at> debbugs.gnu.org, tino.calancha <at> gmail.com
Subject: Re: bug#32506: 27.0.50; loop regression
Date: Mon, 27 Aug 2018 17:30:44 -0400

Helmut Eller wrote:

> With Emacs25 this
>
> (require 'cl)
>
> (defun foo (vector)
>   (loop for i from -1
> 	for exp = 0 then (list exp e i)
> 	for e across vector
> 	finally (return exp)))
>
> (assert (equal (foo [a b]) '((0 a 0) b 1)))
>
> works as it should.  With the current Emacs version (foo [a b])
> incorrectly returns (0 a 0).
[...]
> In GNU Emacs 27.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
>  of 2018-08-23 built on caladan
> Repository revision: a4a3c92e9de59bd0251f36326375cce898919edc

Bisects to a0365437c9ee308ad7978e436631020f513b25e7 (bug#29799).
"cl-loop: Add missing guard condition"

Message #15 received at 32506 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Helmut Eller <eller.helmut <at> gmail.com>
Cc: 32506 <at> debbugs.gnu.org
Subject: Re: bug#32506: 27.0.50; loop regression
Date: Wed, 29 Apr 2020 14:27:24 -0400

tags 32506 fixed
close 32506 27.0.90
quit

Helmut Eller <eller.helmut <at> gmail.com> writes:

> With Emacs25 this
>
> (require 'cl)
>
> (defun foo (vector)
>   (loop for i from -1
> 	for exp = 0 then (list exp e i)
> 	for e across vector
> 	finally (return exp)))
>
> (assert (equal (foo [a b]) '((0 a 0) b 1)))
>
> works as it should.  With the current Emacs version (foo [a b])
> incorrectly returns (0 a 0).

This was fixed by [1: 045cfbef09a].

[1: 045cfbef09a]: 2019-11-22 15:53:58 +0100
  Refix conditional step clauses in cl-loop
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=045cfbef09a67c334e4772cb045181cf2203d839

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