GNU bug report logs -
#24913
25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists
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Reported by: Philipp Stephani <p.stephani2 <at> gmail.com>
Date: Wed, 9 Nov 2016 21:19:02 UTC
Severity: minor
Found in version 25.1.50
Done: Philipp Stephani <p.stephani2 <at> gmail.com>
Bug is archived. No further changes may be made.
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Your message dated Fri, 18 Nov 2016 17:37:26 +0000
with message-id <CAArVCkS+nDPUt+U=GPn4pEpo9YXZoXZu2ij0Hc3Xta2JG=hVhw <at> mail.gmail.com>
and subject line Re: bug#24913: 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists
has caused the debbugs.gnu.org bug report #24913,
regarding 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists
to be marked as done.
(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)
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24913: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24913
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For example:
(funcall (lambda (&optional &rest &rest &optional x) (list x)) 'a)
=> ((a))
Obviously here the &rest keyword "wins", but I think that's overly
confusing. Such an argument list is most likely a programmer mistake,
and should signal an error to make the programmer aware of the mistake.
In GNU Emacs 25.1.50.13 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
of 2016-11-09 built on localhost
Repository revision: eb364fddec1431f459166cebb36f09f6b371dd71
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description: Ubuntu 14.04 LTS
Configured using:
'configure --with-modules --enable-checking
--enable-check-lisp-object-type 'CFLAGS=-ggdb3 -O0''
Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-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
line-number-mode: t
transient-mark-mode: t
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame 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 charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer 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 inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)
Memory information:
((conses 16 88939 12159)
(symbols 48 19888 0)
(miscs 40 343 148)
(strings 32 14757 5052)
(string-bytes 1 440451)
(vectors 16 12779)
(vector-slots 8 446082 5011)
(floats 8 166 60)
(intervals 56 209 0)
(buffers 976 24)
(heap 1024 23753 956))
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Eli Zaretskii <eliz <at> gnu.org> schrieb am Fr., 18. Nov. 2016 um 10:06 Uhr:
> > From: Philipp Stephani <p.stephani2 <at> gmail.com>
> > Date: Thu, 10 Nov 2016 12:58:39 +0000
> >
> > Philipp Stephani <p.stephani2 <at> gmail.com> schrieb am Mi., 9. Nov. 2016
> um 22:19 Uhr:
> >
> > For example:
> >
> > (funcall (lambda (&optional &rest &rest &optional x) (list x)) 'a)
> > => ((a))
> >
> > Obviously here the &rest keyword "wins", but I think that's overly
> > confusing. Such an argument list is most likely a programmer mistake,
> > and should signal an error to make the programmer aware of the mistake.
> >
> > Here's a patch that detects such argument lists.
>
> Thanks, please push to master.
>
Done.
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This bug report was last modified 8 years and 240 days ago.
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