GNU bug report logs - #54240
emacs/lisp/emacs-lisp/derived.el patch

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

From: chenphy10 <at> gmail.com
To: bug-gnu-emacs <at> gnu.org
Subject: emacs/lisp/emacs-lisp/derived.el patch
Date: Thu, 03 Mar 2022 11:45:21 -0500

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

Dear developers/maintainers,

When running "jdee-mode" from Melpa, without the patch, it will create
erorrs on the "mode" undefined. I found it is caused by this quoted
function.

Please let me know if it is a suitable patch.


Best,
Tongjie

[derived.el.patch (text/x-patch, attachment)]

Message #8 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: chenphy10 <at> gmail.com
Cc: 54240 <at> debbugs.gnu.org
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Thu, 03 Mar 2022 18:14:58 +0100

chenphy10 <at> gmail.com writes:

> When running "jdee-mode" from Melpa, without the patch, it will create
> erorrs on the "mode" undefined. I found it is caused by this quoted
> function.
>
> Please let me know if it is a suitable patch.

[...]

> -	       (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> +	       ,(define-abbrev-table (derived-mode-abbrev-table-name mode) nil)

The code looks correct the way it is, I think?

What Emacs version are you seeing this problem in?  Please use `M-x
report-emacs-bug' and include all the information you get in that buffer.

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

Message #13 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Tongjie Chen <chenphy10 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 54240 <at> debbugs.gnu.org
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Thu, 3 Mar 2022 18:02:43 -0500

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

Maybe it's a problem with Emacs 28.0.50. I built it from emacs-ng-git on
Manjaro. I no longer use Emacs 27.


In GNU Emacs 28.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.29,
cairo version 1.17.4)
 of 2021-07-08 built on tongjie-inspiron73062n1
Repository revision: 6b8939983862e9fc54bd816304b66769766e1b20
Repository branch: makepkg
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Manjaro Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-wide-int
 --with-modules --with-cairo --with-harfbuzz --with-nativecomp
 --with-xwidgets 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt
 -fexceptions -Wp,-D_FORTIFY_SOURCE=2,-D_GLIBCXX_ASSERTIONS -Wformat
 -Werror=format-security -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE
XIM XPM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=fcitx5
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
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  openwith-mode: t
  helm--remap-mouse-mode: t
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  pdf-occur-global-minor-mode: t
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  shell-dirtrack-mode: t
  ido-ubiquitous-mode: t
  ido-everywhere: t
  show-paren-mode: t
  org-cdlatex-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
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  display-time-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  abbrev-mode: t

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Memory information:
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On Thu, Mar 3, 2022 at 12:15 PM Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> chenphy10 <at> gmail.com writes:
>
> > When running "jdee-mode" from Melpa, without the patch, it will create
> > erorrs on the "mode" undefined. I found it is caused by this quoted
> > function.
> >
> > Please let me know if it is a suitable patch.
>
> [...]
>
> > -            (define-abbrev-table (derived-mode-abbrev-table-name mode)
> nil)
> > +            ,(define-abbrev-table (derived-mode-abbrev-table-name mode)
> nil)
>
> The code looks correct the way it is, I think?
>
> What Emacs version are you seeing this problem in?  Please use `M-x
> report-emacs-bug' and include all the information you get in that buffer.
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>


-- 
Best,
Tongjie

[Message part 2 (text/html, inline)]

Message #16 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 54240 <at> debbugs.gnu.org, chenphy10 <at> gmail.com
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Fri, 04 Mar 2022 01:36:44 +0100

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

> > - (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> > + ,(define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
>
> The code looks correct the way it is, I think?

To me this looks like a regression introduced when converting to lexical
binding.  Look at the symbol 'mode': it's implicitly quoted so it can't
refer to the lexical variable and you get the error reported.

The patch unquotes too much however, looks like we want something like

> > - (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> > + (define-abbrev-table (derived-mode-abbrev-table-name ',mode) nil)

(does that work?)

Michael.

Message #19 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Tongjie Chen <chenphy10 <at> gmail.com>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 54240 <at> debbugs.gnu.org, Lars Ingebrigtsen <larsi <at> gnus.org>
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Thu, 3 Mar 2022 22:28:23 -0500

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

Thanks Michael. I tested this improved quoting and it worked. Once the
abbrev table is defined, jdee will no longer run into problems.

A strange thing is when eval the previous non patched defun, jdee will
work. Wonder if "mode" was leaked somewhere.

On Thu, Mar 3, 2022 at 7:36 PM Michael Heerdegen <michael_heerdegen <at> web.de>
wrote:

> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
>
> > > - (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> > > + ,(define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> >
> > The code looks correct the way it is, I think?
>
> To me this looks like a regression introduced when converting to lexical
> binding.  Look at the symbol 'mode': it's implicitly quoted so it can't
> refer to the lexical variable and you get the error reported.
>
> The patch unquotes too much however, looks like we want something like
>
> > > - (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
> > > + (define-abbrev-table (derived-mode-abbrev-table-name ',mode) nil)
>
> (does that work?)
>
> Michael.
>


-- 
Best,
Tongjie

[Message part 2 (text/html, inline)]

Message #22 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Tongjie Chen <chenphy10 <at> gmail.com>
Cc: 54240 <at> debbugs.gnu.org, Lars Ingebrigtsen <larsi <at> gnus.org>
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Fri, 04 Mar 2022 04:59:49 +0100

Tongjie Chen <chenphy10 <at> gmail.com> writes:

> Thanks Michael. I tested this improved quoting and it worked. Once the abbrev
> table is defined, jdee will no longer run into problems.

Good.

> A strange thing is when eval the previous non patched defun, jdee will work.
> Wonder if "mode" was leaked somewhere.

The code uses a variable of that name, all with dynamical binding.  So
it might indeed not always error, but the binding of the variable would
probably not the expected one.

Michael.

Message #25 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 54240 <at> debbugs.gnu.org, chenphy10 <at> gmail.com
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Fri, 04 Mar 2022 16:19:59 +0100

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> To me this looks like a regression introduced when converting to lexical
> binding.  Look at the symbol 'mode': it's implicitly quoted so it can't
> refer to the lexical variable and you get the error reported.

Oh, yeah -- I was thinking that the mode had to be lexically bound
there, but of course it isn't really, since eval is ... eval.  (Whenever
there's an eval in code, there's a bug somewhere.)

Would adding LEXICAL to the eval form fix the issue here, or would that
interact oddly with the defvar?

> The patch unquotes too much however, looks like we want something like
>
>> > - (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
>> > + (define-abbrev-table (derived-mode-abbrev-table-name ',mode) nil)
>
> (does that work?)

Tongjie Chen <chenphy10 <at> gmail.com> writes:

> Thanks Michael. I tested this improved quoting and it worked. Once the abbrev
> table is defined, jdee will no longer run into problems. 

OK, I'll push Michael's change to emacs-28, because this is a regression
from Emacs 27.2, I think.

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

Message #30 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 54240 <at> debbugs.gnu.org, chenphy10 <at> gmail.com
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Fri, 04 Mar 2022 22:39:32 +0100

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

> Oh, yeah -- I was thinking that the mode had to be lexically bound
> there, but of course it isn't really, since eval is ... eval.  (Whenever
> there's an eval in code, there's a bug somewhere.)

`defvar' doesn't eval the first argument, and there is no alternative to
using it (right?).  So `derived-mode-init-mode-variables' should just
better be a macro I think.

> Would adding LEXICAL to the eval form fix the issue here, or would that
> interact oddly with the defvar?

Yes - since `defvar' doesn't evaluate its first argument no variable
references will work.  The constructed sexp must contain the final
symbol at that position, any other expression won't do it.

Michael.

Message #33 received at 54240 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 54240 <at> debbugs.gnu.org, chenphy10 <at> gmail.com
Subject: Re: bug#54240: emacs/lisp/emacs-lisp/derived.el patch
Date: Sun, 06 Mar 2022 17:13:22 +0100

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> `defvar' doesn't eval the first argument, and there is no alternative to
> using it (right?).  So `derived-mode-init-mode-variables' should just
> better be a macro I think.

Yeah, I think so, too.

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

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