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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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Subject: bug#24913: closed (Re: bug#24913: 25.1.50; Emacs accepts
 undocumented and confusing combinations of &optional and &rest in argument
 lists)
Date: Fri, 18 Nov 2016 17:38:02 +0000

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

Your bug report

#24913: 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists

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 24913 <at> debbugs.gnu.org.

-- 
24913: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24913
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24913-done <at> debbugs.gnu.org
Subject: Re: bug#24913: 25.1.50; Emacs accepts undocumented and confusing
 combinations of &optional and &rest in argument lists
Date: Fri, 18 Nov 2016 17:37:26 +0000

[Message part 3 (text/plain, inline)]

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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From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1.50;
 Emacs accepts undocumented and confusing combinations of &optional
 and &rest in argument lists
Date: Wed, 09 Nov 2016 22:17:54 +0100

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.

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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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