GNU bug report logs - #29345
27.0.50; Error message for cl-destructuring-bind could be improved

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

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Error message for cl-destructuring-bind could be improved
Date: Fri, 17 Nov 2017 21:30:09 +0100

$ emacs -Q -batch -l cl-lib -eval '(cl-destructuring-bind (a b) (list 1))'
Wrong number of arguments: nil, 1

It would be nice if the first error data item weren't nil, but
e.g. `(cl-destructuring-bind (a b))` so that the error is obvious.


In GNU Emacs 27.0.50 (build 12, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
 of 2017-11-16 built on localhost
Repository revision: bc462efec89c3317a6ee3ef9404356c1c7e52bda
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
System Description:	Debian GNU/Linux

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

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

Configured features:
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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

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Features:
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text-mode elisp-mode lisp-mode prog-mode register page menu-bar
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Memory information:
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 (symbols 48 20393 1)
 (miscs 40 41 120)
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Message #8 received at 29345 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 29345 <at> debbugs.gnu.org
Subject: Re: bug#29345: 27.0.50; Error message for cl-destructuring-bind
 could be improved
Date: Sun, 14 Jul 2019 21:41:59 +0200

Philipp Stephani <p.stephani2 <at> gmail.com> writes:

> $ emacs -Q -batch -l cl-lib -eval '(cl-destructuring-bind (a b) (list 1))'
> Wrong number of arguments: nil, 1
>
> It would be nice if the first error data item weren't nil, but
> e.g. `(cl-destructuring-bind (a b))` so that the error is obvious.

What about

Wrong number of arguments: (a b), 1

The following patch achieves that, but since it was explicitly 'cl-none
before (which is the magic value that gives you nil in that error
message), I'm not sure whether this has any negative effects?  Probably
not, because there's this:

(defvar cl--bind-block) ;Name of surrounding block, only use for `signal' data.

Any opinions?

diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 4347b4b71b..8b9224bd1b 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -695,8 +695,11 @@ cl-destructuring-bind
   "Bind the variables in ARGS to the result of EXPR and execute BODY."
   (declare (indent 2)
            (debug (&define cl-macro-list1 def-form cl-declarations def-body)))
-  (let* ((cl--bind-lets nil) (cl--bind-forms nil)
-	 (cl--bind-defs nil) (cl--bind-block 'cl-none) (cl--bind-enquote nil))
+  (let* ((cl--bind-lets nil)
+         (cl--bind-forms nil)
+	 (cl--bind-defs nil)
+         (cl--bind-block args)
+         (cl--bind-enquote nil))
     (cl--do-arglist (or args '(&aux)) expr)
     (macroexp-let* (nreverse cl--bind-lets)
                    (macroexp-progn (append (nreverse cl--bind-forms) body)))))


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

Message #11 received at 29345 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 29345 <at> debbugs.gnu.org
Subject: Re: bug#29345: 27.0.50; Error message for cl-destructuring-bind
 could be improved
Date: Thu, 25 Jul 2019 21:53:54 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Philipp Stephani <p.stephani2 <at> gmail.com> writes:
>
>> $ emacs -Q -batch -l cl-lib -eval '(cl-destructuring-bind (a b) (list 1))'
>> Wrong number of arguments: nil, 1
>>
>> It would be nice if the first error data item weren't nil, but
>> e.g. `(cl-destructuring-bind (a b))` so that the error is obvious.
>
> What about
>
> Wrong number of arguments: (a b), 1
>
> The following patch achieves that, but since it was explicitly 'cl-none
> before (which is the magic value that gives you nil in that error
> message), I'm not sure whether this has any negative effects?  Probably
> not, because there's this:
>
> (defvar cl--bind-block) ;Name of surrounding block, only use for `signal' data.
>
> Any opinions?

There weren't any, so I'm applying the patch.

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

Message #18 received at 29345 <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 29345 <at> debbugs.gnu.org
Subject: Re: bug#29345: 27.0.50; Error message for cl-destructuring-bind could
 be improved
Date: Wed, 7 Aug 2019 13:09:35 +0200

Am Do., 25. Juli 2019 um 21:54 Uhr schrieb Lars Ingebrigtsen <larsi <at> gnus.org>:
>
> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
>
> > Philipp Stephani <p.stephani2 <at> gmail.com> writes:
> >
> >> $ emacs -Q -batch -l cl-lib -eval '(cl-destructuring-bind (a b) (list 1))'
> >> Wrong number of arguments: nil, 1
> >>
> >> It would be nice if the first error data item weren't nil, but
> >> e.g. `(cl-destructuring-bind (a b))` so that the error is obvious.
> >
> > What about
> >
> > Wrong number of arguments: (a b), 1
> >
> > The following patch achieves that, but since it was explicitly 'cl-none
> > before (which is the magic value that gives you nil in that error
> > message), I'm not sure whether this has any negative effects?  Probably
> > not, because there's this:
> >
> > (defvar cl--bind-block) ;Name of surrounding block, only use for `signal' data.
> >
> > Any opinions?
>
> There weren't any, so I'm applying the patch.

Thanks!

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