GNU bug report logs - #80086
31.0.50; shadowfile: Missing ‘lexical-binding’ cookie in #<buffer shadow_todo>

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

From: Morgan Willcock <morgan <at> ice9.digital>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; shadowfile: Missing ‘lexical-binding’ cookie in #<buffer shadow_todo>
Date: Sun, 28 Dec 2025 15:50:13 +0000

When trying Emacs 31 I get this warning on startup because of issues
with the shadowfile todo buffer:

  ⛔ Warning (files): Missing ‘lexical-binding’ cookie in #<buffer shadow_todo>.
  You can add one with ‘M-x elisp-enable-lexical-binding RET’.
  See ‘(elisp)Selecting Lisp Dialect’ and ‘(elisp)Converting to Lexical Binding’
  for more information.

This doesn't relate to a buffer and file created by the user, both are
managed by shadowfile to persist configuration and state data.  The
buffer is in fundamental-mode rather than lisp-data-mode.

The following should recreate the issue (no data file required):

  emacs -Q -f shadow-initialize



In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.4, Xaw scroll bars) of 2025-12-28 built on aspire
Repository revision: 8afbcb0ffeafd423addebac074fc8237eb10751b
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: Debian GNU/Linux 13 (trixie)

Configured using:
 'configure --with-native-compilation=no --with-tree-sitter=no
 --with-xml2 --with-x-toolkit=lucid'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XPM LUCID ZLIB

Important settings:
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  which-key-mode: t
  display-time-mode: t
  save-place-mode: t
  savehist-mode: t
  repeat-mode: t
  recentf-mode: t
  minibuffer-electric-default-mode: t
  minibuffer-depth-indicate-mode: t
  midnight-mode: t
  ido-everywhere: t
  global-hl-line-mode: t
  editorconfig-mode: t
  global-display-fill-column-indicator-mode: t
  global-diff-hl-mode: t
  global-devil-mode: t
  devil-mode: t
  global-corfu-mode: t
  find-function-mode: t
  override-global-mode: t
  gcmh-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-nonselected-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  view-mode: t

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nnmail mail-source utf7 nnoo gnus-spec gnus-int gnus-range gnus-win gnus
nnheader range emacsbug lisp-mnt switchmail message yank-media puny
dired dired-loaddefs rfc822 mml mml-sec epa derived epg rfc6068
epg-config gnus-util text-property-search mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader sendmail mail-parse rfc2231 rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils view elide-head
flyspell ispell goto-addr thingatpt init which-key time vc-git
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tramp trampver tramp-integration files-x tramp-message tramp-compat
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ansi-color tramp-loaddefs recentf tree-widget wid-edit noutline outline
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pcvs-util vc-dir ewoc vc vc-dispatcher diff-mode track-changes devil
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cond-let-autoloads corfu-autoloads csv-mode-autoloads devil-autoloads
dialog-mode-autoloads diff-hl-autoloads diminish-autoloads
epresent-autoloads flymake-ansible-lint-autoloads gcmh-autoloads
geben-autoloads gptel-autoloads indent-bars-autoloads
inform-mode-autoloads jabber-autoloads fsm-autoloads
kixtart-mode-autoloads lua-mode-autoloads markdown-mode-autoloads
modus-themes-autoloads nsis-mode-autoloads org-autoloads
org-msg-autoloads htmlize-autoloads package-lint-autoloads
php-mode-autoloads plantuml-mode-autoloads deflate-autoloads
dash-autoloads powershell-autoloads rainbow-mode-autoloads
renpy-mode-autoloads info sly-autoloads warnings srv-autoloads
switchmail-autoloads wgrep-autoloads yaml-mode-autoloads package
browse-url xdg url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs icons
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd touch-screen tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-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 nadvice seq simple cl-generic
indonesian philippine 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty move-toolbar make-network-process tty-child-frames emacs)

Memory information:
((conses 16 282999 402952) (symbols 48 23050 391)
 (strings 32 82191 27549) (string-bytes 1 2149969) (vectors 16 34328)
 (vector-slots 8 332684 135495) (floats 8 292 137)
 (intervals 56 1235 467) (buffers 984 16))

Message #8 received at 80086 <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: 80086 <at> debbugs.gnu.org
Subject: Re: bug#80086: Acknowledgement (31.0.50; shadowfile: Missing
 ‘lexical-binding’ cookie in #<buffer
 shadow_todo>)
Date: Sun, 28 Dec 2025 16:12:33 +0000

I think my initial test to recreate the warning was faulty, although it
will give you the buffer state.

For an example which recreates the warning using Emacs -Q:

  # Delete any existing data file.
  rm ~/.emacs.d/shadow_todo

  # Create a new data file with some state data in it.
  # After Emacs has been closed the data file now looks like this:
  #   (setq shadow-files-to-copy nil)
  emacs -Q -f shadow-initialize -f shadow-cancel

  # Generate the warning.
  emacs -Q -f shadow-initialize

-- 
Morgan Willcock

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