GNU bug report logs - #58739
Lack of error message about number of args (?native compilation?)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Subject: bug#58739: closed (Re: bug#58739: Fixed)
Date: Sat, 29 Oct 2022 13:33:02 +0000

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Your bug report

#58739: Lack of error message about number of args (?native compilation?)

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 58739 <at> debbugs.gnu.org.

-- 
58739: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58739
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Alan Mackenzie <acm <at> muc.de>
To: 58739-done <at> debbugs.gnu.org
Subject: Re: bug#58739: Fixed
Date: Sat, 29 Oct 2022 13:32:13 +0000

Bug fixed.

-- 
Alan Mackenzie (Nuremberg, Germany).

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From: Alan Mackenzie <acm <at> muc.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Lack of error message about number of args (?native compilation?)
Date: Sun, 23 Oct 2022 12:12:49 +0000

Hello, Emacs.

Firstly, note that the function desktop-buffer has exactly 12
parameters.

With an up to date Emacs 29:

(i) emacs -Q
(ii) M-x load-library RET desktop RET.
(iii) M-x disassemble RET desktop-buffer.

Note that this is native code.

(iv) M-: (desktop-buffer 1 2 3 4 5 6 7 8 9 10 11 12 13) RET

This gives an error message about 4 not being a list.  What it ought to
do is instead throw an error about the number of arguments.  This is a
bug.

(v) M-x load-file RET /path/to/emacs/lisp/desktop.elc.
(vi) M-x disassemble RET desktop-buffer.

Note that we now have byte compiled code.

(vii) M-: (desktop-buffer 1 2 3 4 5 6 7 8 9 10 11 12 13) RET

We now get a correct error message about the numbere of arguments.

As a matter of interest, I noticed this bug while byte-compiling
desktop.el inside Emacs.  It gave a warning message about the number of
parameters to desktop-buffer having changed from 12+ to 12.

Here, I suspect there's a bug in the native compilation of
desktop-buffer.

-- 
Alan Mackenzie (Nuremberg, Germany).

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