bug#8332: 24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding

bug#8332: 24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding

[Tassilo Horn]

I've compiled the current bzr version of the lexbind-new branch.  The
first thing I did after firing up emacs was

  C-h v lexical-binding RET

That produces this error:

Debugger entered--Lisp error: (void-variable symbol)
  documentation-property(lexical-binding variable-documentation)
  describe-variable(lexical-binding)
  call-interactively(describe-variable nil nil)


In GNU Emacs 24.0.9999.1 (x86_64-pc-linux-gnu, GTK+ Version 2.22.1)
 of 2011-03-23 on thinkpad
Windowing system distributor `The X.Org Foundation', version 11.0.10905000
configured using `configure  '--prefix=/usr' '--build=x86_64-pc-linux-gnu' '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--libdir=/usr/lib64' '--disable-dependency-tracking' '--program-suffix=-emacs-24-lexbind-new' '--infodir=/usr/share/info/emacs-24-lexbind-new' '--with-crt-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.2/../../../../lib64' '--with-gameuser=games' '--without-compress-info' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' '--with-gnutls' '--without-selinux' '--with-sound' '--with-x' '--without-gconf' '--without-xml2' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--with-imagemagick' '--with-xft' '--without-libotf' '--without-m17n-flt' '--with-x-toolkit=gtk' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-march=native -O2 -pipe' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  diff-auto-refine-mode: t
  hl-line-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  recentf-mode: t
  window-number-meta-mode: t
  window-number-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  icomplete-mode: t
  tooltip-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k 
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k 
C-k <return> O k , SPC I SPC s e e . SPC SPC I SPC 
d i d n ' t SPC w a n t SPC t o SPC d r ä n g e l n 
C-c t <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <down> <down> <down> SPC 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <M-backspace> 
<backspace> C-e , SPC I SPC j u s t <M-backspace> w 
a s SPC j u s t SPC w o n d e r i n g SPC t h a t SPC 
I SPC d i d <return> M-q SPC h e a r SPC a n y t h 
i n g SPC a f t e r SPC s e n d i n g SPC t h e SPC 
s m a l l e r SPC p a t c h SPC y e u SPC <backspace> 
<backspace> <backspace> o u SPC r e q u e s t e d . 
<return> <return> <backspace> <backspace> SPC SPC S 
o <backspace> <backspace> <backspace> <backspace> <return> 
<return> b <tab> C-c C-c q <down> <down> <up> L <down> 
<down> <down> <down> <down> <down> <down> C-u 1 0 <return> 
<return> <down> <down> <down> <up> <return> S W C-k 
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-x k <return> 
y M-x r e p o r t <tab> <return>

Recent messages:
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20110323T213056.600> Scoring...
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20110323T213056.605> Generating summary...
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20110323T213056.611> No more unread articles
Mark set [2 times]
Buffer *unsent wide reply to Stefan Monnier* modified; kill anyway? (y or n)  y

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Features:
(shadow hippie-exp emacsbug mailalias smtpmail sort smiley ansi-color
gnus-cite qp gnus-async gnus-bcklg gnus-ml nndraft nnmh utf-7 rot13
nnimap utf7 netrc nnml nnnil gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-cache gnus-demon nntp proto-stream starttls spam
spam-stat bbdb-com gnus-uu yenc gnus-msg gnus-gravatar mail-extr
gravatar gnus-topic gnus-registry th-private find-func debug parse-time
cal-iso tla smerge-mode newcomment dvc-state dvc-config diff tla-gnus
dvc-gnus dvc-cmenu dvc-about dvc-version xgit-dvc xgit xgit-annotate
dvc-annotate xgit-log dvc-revlist dvc-diff dvc-fileinfo bzr-core
tla-core tla-autoconf tla-defs dvc-log vc vc-dispatcher dvc-unified
dvc-tips ediff-merg ediff-diff ediff-wind ediff-help ediff-util
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eldoc go-mode-load flymake greqlscript-mode greql-mode tg-mode generic
th-latex preview-latex tex-site auto-loads paredit dvc-autoloads
dvc-core dvc-lisp dvc-buffers dvc-ui dvc-register dvc-utils dvc-emacs
ewoc dvc-defs dvc-site magit diff-mode log-edit pcvs-util add-log
magit-key-mode epa-file epa epg wtf cus-edit cus-start cus-load rdictcc
org-location-google-maps google-maps google-maps-static
google-maps-geocode google-maps-base json org-google-weather
google-weather xml url-cache org-beamer solar cal-dst holidays
hol-loaddefs appt diary-lib diary-loaddefs vc-git hl-line org-w3m
org-irc org-jsinfo org-infojs org-html org-exp ob-exp org-exp-blocks
org-info org-gnus org-docview org-bibtex org-bbdb org-protocol
org-attach org-id org-agenda org-contacts gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig nnir gnus-sum nnoo gnus-group
gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
gnus-win org ob-emacs-lisp ob-tangle ob-ref ob-lob ob-table org-footnote
org-src ob-comint ob-keys ob ob-eval org-pcomplete pcomplete org-list
org-faces org-compat org-entities org-macs org-install cal-menu calendar
cal-loaddefs dired-x highlight-symbol hi-lock th-boxquote boxquote rect
ecomplete message idna sendmail rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mailabbrev gmm-utils mailheader info edit-server server
auto-complete-config auto-complete popup yasnippet dropdown-list
help-mode view disp-table noutline outline browse-kill-ring derived
recentf tree-widget sr-speedbar speedbar sb-image ezimage dframe
anything-config browse-url semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet imenu bookmark pp
easymenu rx grep compile comint ring tramp tramp-compat format-spec
tramp-loaddefs dired-aux dired ffap thingatpt anything window-number
uniquify subword saveplace savehist highlight-parentheses easy-mmode cl
paren icomplete warnings edmacro kmacro th-common mm-url gnus gnus-ems
nnheader mail-utils wid-edit url-http tls url url-proxy url-privacy
url-expand url-methods url-history mailcap url-auth mail-parse rfc2231
rfc2047 rfc2045 ietf-drums url-cookie url-util url-parse auth-source
eieio byte-opt bytecomp byte-compile cconv macroexp assoc gnus-util
time-date password-cache url-gw url-vars mm-util mail-prsvr windmove
gnus-load tsdh-dark-theme sha1 hex-util swank-clojure-autoloads advice
help-fns advice-preload clojure-mode-autoloads slime-repl-autoloads
slime-autoloads package site-gentoo bbdb-autoloads bbdb regexp-opt
timezone tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev loaddefs button minibuffer faces
cus-face files text-properties overlay md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[Tassilo Horn]

Hi!

I just found out, that this does not happen with

  emacs -Q --eval '(setq lexical-binding t)'

so it has to be some of my configs...

After some bisectioning, I found out the culprit is anything.
Commenting out

  (require 'anything)

in my .emacs, so I'll Cc-ed Thierry and Rubykitch.

BTW, the error is not specific to `describe-variable'.  I get these
errors for all describe commands.  For example, that's what I get with
M-x describe-function next-line.

Debugger entered--Lisp error: (void-variable symbol)
  documentation-property(auto-window-vscroll variable-documentation)
  help-make-xrefs(#<buffer *Help*>)
  help-mode-finish()
  run-hooks(temp-buffer-show-hook)
  internal-temp-output-buffer-show(#<buffer *Help*>)
  describe-function(next-line)
  call-interactively(describe-function)
  (lambda nil (call-interactively (function describe-function)))()
  funcall((lambda nil (call-interactively (function describe-function))))
  (progn (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max))))
  (unwind-protect (progn (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max)))) (set-window-configuration wconfig))
  (let ((wconfig (current-window-configuration))) (unwind-protect (progn (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max)))) (set-window-configuration wconfig)))
  (save-window-excursion (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max))))
  (boxquote-text (save-window-excursion (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max)))))
  (let ((one-window-p (one-window-p))) (boxquote-text (save-window-excursion (funcall help-call) (with-current-buffer (boxquote-help-buffer-name (funcall item)) (buffer-substring-no-properties (point-min) (point-max))))) (boxquote-title (format title-format (funcall item))) (when one-window-p (delete-other-windows)))
  boxquote-quote-help-buffer((lambda nil (call-interactively (function describe-function))) "C-h f %s RET" (lambda nil (car (if (boxquote-xemacs-p) (symbol-value (quote function-history)) minibuffer-history))))
  boxquote-describe-function()
  call-interactively(boxquote-describe-function nil nil)

Bye,
Tassilo

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[Stefan Monnier]

> After some bisectioning, I found out the culprit is anything.
> Commenting out
>   (require 'anything)
> in my .emacs, so I'll Cc-ed Thierry and Rubykitch.

Please try to only set lexical-binding via file-local variables.
This should be 100% backward compatible (i.e. only affect the files
where you've set that variable), so any new error like the above
is not normal.  There are a few rare backward incompatibilities, but
they are fairly rare (e.g. the `byte-compile' property works a bit
differently, and there are new representations for functions, so if the
code checks (eq (car foo) 'lambda) instead of using `functionp' it might
bump into problems).


        Stefan

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

>> After some bisectioning, I found out the culprit is anything.
>> Commenting out
>>   (require 'anything)
>> in my .emacs, so I'll Cc-ed Thierry and Rubykitch.
>
> Please try to only set lexical-binding via file-local variables.  This
> should be 100% backward compatible (i.e. only affect the files where
> you've set that variable), so any new error like the above is not
> normal.

I don't set lexical-binding globally (anymore).  The following recipe
produces the aformentioned error for me.

1. emacs -Q

2. C-h v lexical-binding RET shows its value is nil, and it shows its
   docs.

3. In *scratch* eval:

   (add-to-list 'load-path "~/repos/el/anything-config/")
   (require 'anything)

4. M-x toggle-debug-on-error (only to get the backtrace in 5.)

5. C-h v lexical-binding RET, and I get

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (void-variable symbol)
  (eq symbol (quote anything-type-attributes))
  (if (eq symbol (quote anything-type-attributes)) (progn (setq ad-return-value (concat ad-return-value "\n\n++++ Types currently defined ++++\n" (mapconcat (lambda (sym) (get sym (quote anything-typeattrdoc))) anything-types "\n")))))
  (when (eq symbol (quote anything-type-attributes)) (setq ad-return-value (concat ad-return-value "\n\n++++ Types currently defined ++++\n" (mapconcat (lambda (sym) (get sym (quote anything-typeattrdoc))) anything-types "\n"))))
  (let (ad-return-value) (setq ad-return-value (apply (quote ad-Orig-documentation-property) arg1 arg2 rest)) (when (eq symbol (quote anything-type-attributes)) (setq ad-return-value (concat ad-return-value "\n\n++++ Types currently defined ++++\n" (mapconcat (lambda (sym) (get sym (quote anything-typeattrdoc))) anything-types "\n")))) (when (eq symbol (quote anything-sources)) (setq ad-return-value (concat ad-return-value "\n" (mapconcat (lambda (sym) (get sym (quote anything-attrdoc))) anything-additional-attributes "\n")))) ad-return-value)
  documentation-property(lexical-binding variable-documentation)
  describe-variable(lexical-binding)
  call-interactively(describe-variable nil nil)
--8<---------------cut here---------------end--------------->8---

6. After closing the backtrace buffer with `q', that's what I get in
   *Help*

--8<---------------cut here---------------start------------->8---
lexical-binding is a variable defined in `C source code'.
Its value is nil
--8<---------------cut here---------------end--------------->8---

So the docs and the notice, that this variable automatically becomes
buffer local when setting it are missing.

My anything files are *not* compiled.

Bye,
Tassilo

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[rubikitch]

From: Tassilo Horn <tassilo@member.fsf.org>
Subject: Re: bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)
Date: Thu, 24 Mar 2011 16:27:07 +0100

> Debugger entered--Lisp error: (void-variable symbol)

I replace `symbol' with `(ad-get-arg 0)'.
Do you have still problem?

cheers,
--
rubikitch

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[Stefan Monnier]

>> Debugger entered--Lisp error: (void-variable symbol)
> I replace `symbol' with `(ad-get-arg 0)'.
> Do you have still problem?

Oh, yes, that would do it: advices that rely on dynamic scoping to
access their arguments may fail to work when advising
a lexically-scoped function.


        Stefan

bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on M-x describe-variable lexical-binding)

[Tassilo Horn]

rubikitch@ruby-lang.org writes:

> From: Tassilo Horn <tassilo@member.fsf.org>
> Subject: Re: bug#8332: Acknowledgement (24.0.9999; lexbind-new branch errors on
> M-x describe-variable lexical-binding)
> Date: Thu, 24 Mar 2011 16:27:07 +0100
>
>> Debugger entered--Lisp error: (void-variable symbol)
>
> I replace `symbol' with `(ad-get-arg 0)'.
> Do you have still problem?

No, that fixes the issue.  Thanks a lot!

I close this bug with this mail.

Bye,
Tassilo