GNU bug report logs - #51368
29.0.50; `cl-case' should error on incorrect use

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Package: emacs; Reported by: Philipp Stephani <p.stephani2@HIDDEN>; dated Sun, 24 Oct 2021 07:53:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Philipp Stephani <p.stephani2@HIDDEN>
Subject: Re: bug#51368: 29.0.50; `cl-case' should error on incorrect use
References: <wvr4h7d6g8r0.fsf@HIDDEN>
Date: Sun, 24 Oct 2021 19:48:54 +0200
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 Content preview: Philipp Stephani <p.stephani2@HIDDEN> writes: > This form
 demonstrates a few incorrect uses of `cl-case': > > (cl-case a > (nil 0)
 ; doesn't match anything > (t 1) ; matches everything, but too early > ('foo
 2)) ; matches `quote' in addition to ` [...] 
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Philipp Stephani <p.stephani2@HIDDEN> writes:

> This form demonstrates a few incorrect uses of `cl-case':
>
> (cl-case a
>   (nil 0)   ; doesn't match anything
>   (t 1)     ; matches everything, but too early
>   ('foo 2)) ; matches `quote' in addition to `foo'
>
> It would be nice if `cl-case' would signal an error or at least warn
> about these at macroexpansion time, since they are somewhat subtle and
> easy to get wrong.

An error from the second case would be nice, and a warning on the first
case, but the third case:

(macroexpand
 '(cl-case a
    ('foo (message "foo"))))
=> (cond ((cl-member a ''foo) (message "foo")))

and

(equal ''foo (list 'quote 'foo))

which, sure, whatever.  But I guess the question is whether we can
actually warn about that, because to the reader, the two forms are
equivalent? 

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#51368; Package emacs. Full text available.

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Subject: Re: bug#51368: 29.0.50; `cl-case' should error on incorrect use
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Andreas Schwab <schwab@HIDDEN> writes:

> On Okt 24 2021, Philipp Stephani wrote:
>
>> This form demonstrates a few incorrect uses of `cl-case':
>>
>> (cl-case a
>>   (nil 0)   ; doesn't match anything
>>   (t 1)     ; matches everything, but too early
>>   ('foo 2)) ; matches `quote' in addition to `foo'
>>
>> It would be nice if `cl-case' would signal an error or at least warn
>> about these at macroexpansion time, since they are somewhat subtle and
>> easy to get wrong.
>
> clisp errors out on the misplaced `t' clause, but is otherwise silent.

I think it would be good if we could error out on the misplaced t.




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bug#51368; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
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Subject: Re: bug#51368: 29.0.50; `cl-case' should error on incorrect use
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On Okt 24 2021, Philipp Stephani wrote:

> This form demonstrates a few incorrect uses of `cl-case':
>
> (cl-case a
>   (nil 0)   ; doesn't match anything
>   (t 1)     ; matches everything, but too early
>   ('foo 2)) ; matches `quote' in addition to `foo'
>
> It would be nice if `cl-case' would signal an error or at least warn
> about these at macroexpansion time, since they are somewhat subtle and
> easy to get wrong.

clisp errors out on the misplaced `t' clause, but is otherwise silent.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
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From: Philipp Stephani <p.stephani2@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 29.0.50; `cl-case' should error on incorrect use
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This form demonstrates a few incorrect uses of `cl-case':

(cl-case a
  (nil 0)   ; doesn't match anything
  (t 1)     ; matches everything, but too early
  ('foo 2)) ; matches `quote' in addition to `foo'

It would be nice if `cl-case' would signal an error or at least warn
about these at macroexpansion time, since they are somewhat subtle and
easy to get wrong.


In GNU Emacs 29.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, c=
airo version 1.16.0)
 of 2021-10-24
Repository revision: aea4af5119fdf130f1df7190478a23c6777f92a2
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux rodete

Configured using:
 'configure --enable-gcc-warnings=3Dwarn-only
 --enable-gtk-deprecation-warnings --without-pop --with-mailutils
 --enable-checking=3Dall --enable-check-lisp-object-type --with-modules
 'CFLAGS=3D-O0 -ggdb3''

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP
SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=3Dibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-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
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs rfc822
mml mml-sec epa epg rfc6068 epg-config gnus-util rmail rmail-loaddefs
time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils phst skeleton derived pcase ffap thingatpt url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache json map url-vars mailcap rx
gnutls puny dbus xml seq gv subr-x byte-opt bytecomp byte-compile cconv
compile text-property-search comint ansi-color ring cl-loaddefs cl-lib
iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode 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 lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax 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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 68529 4717)
 (symbols 48 8401 3)
 (strings 32 24306 1951)
 (string-bytes 1 786068)
 (vectors 16 15413)
 (vector-slots 8 204610 8730)
 (floats 8 26 36)
 (intervals 56 225 0)
 (buffers 992 11))

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Acknowledgement sent to Philipp Stephani <p.stephani2@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#51368; Package emacs. Full text available.
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Last modified: Sun, 24 Oct 2021 18:00:02 UTC

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