GNU bug report logs - #42919
27.1; Strange byte compile error with `cond' involving cons

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ikumi Keita <ikumi <at> ikumi.que.jp>
Subject: bug#42919: closed (Re: bug#42919: 27.1; Strange byte compile
 error with `cond' involving cons)
Date: Wed, 19 Aug 2020 17:20:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#42919: 27.1; Strange byte compile error with `cond' involving cons

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 42919 <at> debbugs.gnu.org.

-- 
42919: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=42919
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Mattias Engdegård <mattiase <at> acm.org>
To: 42919-done <at> debbugs.gnu.org
Cc: "Basil L. Contovounesios" <contovob <at> tcd.ie>,
 Ikumi Keita <ikumi <at> ikumi.que.jp>, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#42919: 27.1; Strange byte compile error with `cond' involving
 cons
Date: Wed, 19 Aug 2020 19:19:11 +0200

Pushed to emacs-27; closing.

[Message part 3 (message/rfc822, inline)]

From: Ikumi Keita <ikumi <at> ikumi.que.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; Strange byte compile error with `cond' involving cons
Date: Wed, 19 Aug 2020 04:00:16 +0900

I encountered a strange byte compile error with simple elisp code.

[How to reproduce]
1. Save the following file as /tmp/foo.el:
--- /tmp/foo.el ----------------------------
(defun xyz (arg)
  (cond
;   ((member '("image") arg) ; OK
;   ((member '(rel "image") arg) ; OK
;   ((remove '(rel . "image") arg) ; OK
;   ((memq '(rel . "image") arg) ; NG
   ((member '(rel . "image") arg) ; NG
    1)))
--------------------------------------------
2. emacs-27.1 -Q
3. M-x byte-compile-file /tmp/foo.el RET
4. Then byte compile fails with the following error:
Compiling file /tmp/foo.el at Wed Aug 19 03:38:06 2020
Entering directory ‘/tmp/’
foo.el:1:13:Error: Wrong type argument: listp, "image"
in *Compile-Log* buffer. I don't see foo.elc in /tmp after that.
Expected result is that byte compile finishes without error and foo.elc
is generated.

[Additional info]
a. As written in the above code, only cons (rel . "image") causes this
   error. Both lists (rel "image") and ("image") are OK.
b. As written in the above code, both `member' and `memq' fail while
   `remove' succeeds.
c. Emacs 26.3 works as expected.

Regards,
Ikumi Keita


In GNU Emacs 27.1 (build 1, x86_64-unknown-freebsd12.1, GTK+ Version 3.24.20)
 of 2020-08-19 built on freebsd.vmware
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: 12.1-RELEASE-p8

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Compiling /tmp/foo.el... (xyz)
You can run the command ‘byte-compile-file’ with M-x by-c RET
Compiling /tmp/foo.el... (xyz)
Mark set
next-line: End of buffer [2 times]
Mark set
Making completion list...

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY KQUEUE ACL
GNUTLS LIBXML2 FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
XDBE XIM MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $EMACSLOADPATH: /home/keita/elisp:
  value of $LANG: C
  locale-coding-system: nil

Major mode: Emacs-Lisp

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/keita/elisp/reftex-parse hides /home/keita/scr/emacs-27.1/lisp/textmodes/reftex-parse

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs text-property-search seq gv
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date subr-x cl-loaddefs cl-lib warnings byte-opt compile
comint ansi-color ring bytecomp byte-compile cconv tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win
x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind kqueue lcms2 dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 51013 10241)
 (symbols 48 6580 1)
 (strings 32 16915 1623)
 (string-bytes 1 565681)
 (vectors 16 10152)
 (vector-slots 8 141502 12592)
 (floats 8 25 119)
 (intervals 56 304 125)
 (buffers 1000 16))

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