GNU bug report logs - #47588
28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]

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

From: Jean Louis <bugs <at> gnu.support>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
Date: Sun, 04 Apr 2021 08:37:08 +0300

Since some time, not so long ago, maybe week or weeks, I have noticed
that C-M-x cannot evaluate definition when inside of definition. This
does not happen in 'emacs -Q' and I have not observed it before.

Error I get is:

elisp--eval-defun: Symbol’s function definition is void: nil [3 times]


In GNU Emacs 28.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo version 1.17.4, Xaw3d scroll bars)
 of 2021-04-01 built on protected.rcdrun.com
Repository revision: 168d2628b233337a1fbf90d05dbcc3fa39f771e7
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
Configured using:
 'configure --with-x-toolkit=lucid'

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 SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11
XAW3D XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Hyperscope

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/home/data1/protected/.emacs.d/elpa/org-20201216/ob-matlab hides /home/data1/protected/Programming/Software/emacs/lisp/org/ob-matlab
/home/data1/protected/.emacs.d/elpa/org-20201216/org-attach-git hides /home/data1/protected/Programming/Software/emacs/lisp/org/org-attach-git
/home/data1/protected/.emacs.d/elpa/org-20201216/ob-scheme hides /home/data1/protected/Programming/Software/emacs/lisp/org/ob-scheme
/home/data1/protected/.emacs.d/elpa/org-20201216/ol-eww hides /home/data1/protected/Programming/Software/emacs/lisp/org/ol-eww
/home/data1/protected/.emacs.d/elpa/flim-20200908.1428/sasl hides /home/data1/protected/Programming/Software/emacs/lisp/net/sasl
/home/data1/protected/.emacs.d/elpa/dictionary-20201001.1727/dictionary hides /home/data1/protected/Programming/Software/emacs/lisp/net/dictionary

Features:
(shadow emacsbug mailalias sql mule-util shortdoc hi-lock macros
hmouse-tag etags fileloop xref project misearch multi-isearch sendmail
rcd-wrs dired-x help-fns radix-tree cl-print debug backtrace
smerge-mode diff-mode diff dired-aux dired-launch bookmark hywconfig
gnutls network-stream url-http url-gw nsm url-auth pp url-cache server
ol-w3m ol-rmail ol-mhe ol-irc ol-info org-id org-refile ol-gnus
nnselect gnus-search eieio-opt cl-extra speedbar ezimage dframe ol-eww
eww xdg url-queue thingatpt mm-url ol-docview doc-view jka-compr
image-mode exif ol-bibtex bibtex ol-bbdb ob-dot ob-lisp ob-perl
ob-scheme ob-shell ob-sql ob-ditaa ob-plantuml which-key timeclock
symon paren scroll-all savehist saveplace immortal-scratch helm-mode
helm-files tramp tramp-loaddefs trampver tramp-integration files-x
tramp-compat shell ls-lisp helm-buffers helm-occur helm-tags
helm-locate helm-grep wgrep-helm wgrep grep compile helm-regexp
helm-utils helm-help helm-types hl-line elec-pair time battery
cus-start cus-load bbdb bbdb-site timezone mutt-tools ivy delsel
ivy-faces ivy-overlay colir maildir qp maildir-index dash s noflet
cl-indent dotassoc kv gnus-art mm-uu mml2015 gnus-sum shr kinsoku svg
dom gnus-group gnus-undo gnus-start gnus-dbus dbus xml gnus-cloud
nnimap nnmail mail-source utf7 netrc nnoo parse-time iso8601 gnus-spec
gnus-int gnus-range message rmc puny rfc822 mml mailabbrev gmm-utils
gnus-win gnus nnheader wid-edit mm-view mml-smime mml-sec epa derived
epg epg-config gnus-util rmail rmail-loaddefs mail-utils
text-property-search smime dig mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr
mailheader rcd-vc windmove rcd-cf helm async-bytecomp
helm-global-bindings edmacro kmacro helm-source eieio-compat
helm-multi-match helm-lib async rcd-db chart time-stamp rcd-db-init pq
rcd-password persistent-scratch gold-price units facemenu org-protocol
disp-table enriched hyperbole hinit hibtypes hib-doc-id klink hib-kbd
hib-debbugs hib-social hsys-www hib-org hsys-org org-element avl-tree
generator org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-footnote org-src ob-comint org-pcomplete pcomplete comint
ansi-color ring org-list org-faces org-entities time-date org-version
ob-emacs-lisp ob-core ob-eval org-table ol org-keys org-compat advice
org-macs org-loaddefs format-spec find-func hactypes hui-mini hui
hui-mouse hmouse-key hargs hui-menu hyrolo-menu hui-jmenu noutline
outline hmouse-sh hmouse-drv hypb locate hui-window pulse color
hycontrol hsettings hui-em-but hyrolo hmail hbut view hact hpath hhist
hbdata htz cal-julian hbmap hmoccur help-mode hui-select hvar set
hversion hload-path hyperbole-autoloads kotl-autoloads tex-site
helm-easymenu cl easy-mmode slime-autoloads finder-inf info package
browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json map url-vars seq byte-opt bytecomp byte-compile
cconv rcd-utilities gv rx subr-x dired dired-loaddefs cl-loaddefs
cl-lib cal-menu calendar cal-loaddefs iso-transl tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type 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
elisp-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 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 lcms2 dynamic-setting system-font-setting font-render-setting
cairo x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 454275 66132)
 (symbols 48 38376 1)
 (strings 32 176839 29032)
 (string-bytes 1 6413769)
 (vectors 16 67957)
 (vector-slots 8 1556759 198278)
 (floats 8 565 424)
 (intervals 56 6680 35)
 (buffers 992 33))


-- 
Thanks,
Jean Louis

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https://www.fsf.org/campaigns

Message #8 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jean Louis <bugs <at> gnu.support>
Cc: 47588 <at> debbugs.gnu.org
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun:
 Symbol’s function definition is void: nil [3 times]
Date: Sun, 04 Apr 2021 10:41:04 +0300

> Date: Sun, 04 Apr 2021 08:37:08 +0300
> From: Jean Louis <bugs <at> gnu.support>
> 
> 
> Since some time, not so long ago, maybe week or weeks, I have noticed
> that C-M-x cannot evaluate definition when inside of definition. This
> does not happen in 'emacs -Q' and I have not observed it before.
> 
> Error I get is:
> 
> elisp--eval-defun: Symbol’s function definition is void: nil [3 times]

Please set debug-on-error to a non-nil value, repeat the recipe, and
post a full backtrace here.

Message #11 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Jean Louis <bugs <at> gnu.support>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 47588 <at> debbugs.gnu.org
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
Date: Thu, 8 Apr 2021 17:21:16 +0300

* Eli Zaretskii <eliz <at> gnu.org> [2021-04-04 10:42]:
> > Date: Sun, 04 Apr 2021 08:37:08 +0300
> > From: Jean Louis <bugs <at> gnu.support>
> > 
> > 
> > Since some time, not so long ago, maybe week or weeks, I have noticed
> > that C-M-x cannot evaluate definition when inside of definition. This
> > does not happen in 'emacs -Q' and I have not observed it before.
> > 
> > Error I get is:
> > 
> > elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
> 
> Please set debug-on-error to a non-nil value, repeat the recipe, and
> post a full backtrace here.

I got it by pure incident and observation, here is how you can
replicate it:

1. emacs -Q

2. Go to *scratch* (but it is happening anywhere)

2. Evaluate (number-to-string nil) and get error, do not press Q in
   *Backtrace*, switch back to *scratch*

3. Try evaluating any defun with C-M-x it will give error:
   elisp--eval-defun: Symbol’s function definition is void: nil

4. You can evaluate with C-x C-e on the end of the defun, but not in
   the middle with C-M-x

5. Go to *Backtrace*, click q or erase *Backtrace*, come back and it
   works again.
   
But I am sure I never had this problem before. It started recently,
maybe months, maybe weeks.

Jean

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Message #14 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Jean Louis <bugs <at> gnu.support>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 47588 <at> debbugs.gnu.org
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
Date: Sat, 17 Apr 2021 20:28:17 +0300

I hope you have got the answer on this, did you Eli?

Message #17 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jean Louis <bugs <at> gnu.support>
Cc: 47588 <at> debbugs.gnu.org
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode:
 elisp--eval-defun: Symbol’s function definition is
 void: nil [3 times]
Date: Sat, 17 Apr 2021 21:12:58 +0300

> Date: Sat, 17 Apr 2021 20:28:17 +0300
> From: Jean Louis <bugs <at> gnu.support>
> Cc: 47588 <at> debbugs.gnu.org
> 
> I hope you have got the answer on this, did you Eli?

I didn't intend to work on this, I just wanted to have the information
for someone to start working on that.  I hope they can now.

Message #20 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Jean Louis <bugs <at> gnu.support>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 47588 <at> debbugs.gnu.org
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
Date: Sat, 17 Apr 2021 22:13:25 +0300

* Eli Zaretskii <eliz <at> gnu.org> [2021-04-17 21:13]:
> > Date: Sat, 17 Apr 2021 20:28:17 +0300
> > From: Jean Louis <bugs <at> gnu.support>
> > Cc: 47588 <at> debbugs.gnu.org
> > 
> > I hope you have got the answer on this, did you Eli?
> 
> I didn't intend to work on this, I just wanted to have the information
> for someone to start working on that.  I hope they can now.

Alright good to know.

Message #23 received at 47588 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Jean Louis <bugs <at> gnu.support>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 47588 <at> debbugs.gnu.org,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode: elisp--eval-defun: Symbol’s function definition is void: nil [3 times]
Date: Sat, 17 Apr 2021 23:48:53 +0000

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

>
> 1. emacs -Q
>
> 2. Go to *scratch* (but it is happening anywhere)
>
> 2. Evaluate (number-to-string nil) and get error, do not press Q in 
> *Backtrace*, switch back to *scratch*
>
> 3. Try evaluating any defun with C-M-x it will give error: 
> elisp--eval-defun: Symbol’s function definition is void: nil
>
> 4. You can evaluate with C-x C-e on the end of the defun, but not in the 
> middle with C-M-x
>
> 5. Go to *Backtrace*, click q or erase *Backtrace*, come back and it 
> works again.
>

IIUC, this is a kind chicken-and-egg problem: eval-defun at that point 
does not work without a (require 'edebug), which executes 
(edebug-install-read-eval-functions), which puts an advice around 
eval-defun...

Here's a patch, which I'm sure is not TRT, but which at least fixes that 
bug.  Cc'ing Stefan, who wrote bae2cfe63c, who might have a better idea on 
how this should be done.

[Load-edebug-before-actually-calling-eval-defun.patch (text/x-diff, attachment)]

Message #28 received at 47588-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 47588-done <at> debbugs.gnu.org,
 Jean Louis <bugs <at> gnu.support>
Subject: Re: bug#47588: 28.0.50; C-M-x in emacs-lisp-mode:
 elisp--eval-defun: Symbol’s function definition is
 void: nil [3 times]
Date: Sun, 18 Apr 2021 01:06:35 -0400

It took me a while to figure out that the

    Symbol’s function definition is void: nil

was coming from `load-read-function` being nil (which was due to it
being rebound to nil by the `debug` function).

I installed the patch below which seems to fix it.
It's all still pretty messy, sadly.


        Stefan


commit 5c07cd0f156217db268ccb9fa64566fb429c4257 (HEAD -> trunk, origin/master, origin/HEAD)
Author: Stefan Monnier <monnier <at> iro.umontreal.ca>
Date:   Sun Apr 18 01:03:43 2021 -0400

    * lisp/emacs-lisp/debug.el (debug): Fix (bug#47588)
    
    Don't bind `load-read-function` to nil but to its actual default value.
    Actually, I'm not sure it's worth the trouble rebinding this var, but
    if we do, then we should bind it to a valid value rather than to nil.
    
    * lisp/emacs-lisp/edebug.el (edebug--eval-defun): Re-install our advice
    if needed.

diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
index b2d54c77feb..069c7a90ad0 100644
--- a/lisp/emacs-lisp/debug.el
+++ b/lisp/emacs-lisp/debug.el
@@ -213,7 +213,7 @@ debug
              last-input-event last-command-event last-nonmenu-event
              last-event-frame
              overriding-local-map
-         load-read-function
+       (load-read-function #'read)
              ;; If we are inside a minibuffer, allow nesting
              ;; so that we don't get an error from the `e' command.
              (enable-recursive-minibuffers
diff --git a/lisp/emacs-lisp/edebug.el b/lisp/emacs-lisp/edebug.el
index cbc40193125..b08ee3c4a17 100644
--- a/lisp/emacs-lisp/edebug.el
+++ b/lisp/emacs-lisp/edebug.el
@@ -459,6 +459,9 @@ edebug--eval-defun
 If acting on a `defun' for FUNCTION, and the function was instrumented,
 `Edebug: FUNCTION' is printed in the minibuffer.  If not instrumented,
 just FUNCTION is printed."
+  ;; Re-install our advice, in case `debug' re-bound `load-read-function' to
+  ;; its default value.
+  (add-function :around load-read-function #'edebug--read)
   (let* ((edebug-all-forms (not (eq (not edebug-it) (not edebug-all-defs))))
         (edebug-all-defs  edebug-all-forms))
     (funcall orig-fun nil)))

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