--text follows this line-- This bug report will be sent to the Bug-GNU-Emacs mailing list and the GNU bug tracker at debbugs.gnu.org. Please check that the From: line contains a valid email address. After a delay of up to one day, you should receive an acknowledgment at that address. Please write in English if possible, as the Emacs maintainers usually do not have translators for other languages. Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from 'emacs -Q': The `vc-switch-backend' command was obsoleted in Emacs 28.1. That's a problem for me, as I am often using a dual (D)VCS repository scheme. For example, I might have a directory tree that is a Git repository, and some of the sub-directories are Mercurial repositories. When using Emacs VC support I can instruct Emacs to use Git or Mercurial when processing the files in the directories that end-up under both (D)VCS repositories. I use that under several OS, not only macOS (as reported in this bug report) and not only in older Emacs (as shown in this bug report). I'm also using other VCS, Subversion for instance. The reason I'm using this dual-(D)VCS scheme has to do with the ability to easily perform backup and maintaining a separate code change history when having to use an other VCS due to corporate reasons for contracts I work on and therefore have no control over the choice of the main (D)VCS. The `vc-switch-backend' command is one of the most useful feature of the Emacs VC backend making this easily feasible. I'm hoping you will not remove this useful feature from Emacs distribution. Thanks! If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: 'bt full' and 'xbacktrace'. For information about debugging Emacs, please read the file /usr/local/Cellar/emacs/26.3/share/emacs/26.3/etc/DEBUG. In GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.6.0) of 2019-08-30 built on Mojave.local Recent messages: Finding changes in /Users/roup/dev/elisp/pel/pel-setup.el...done Ispell process killed Starting new Ispell process /usr/local/bin/aspell with default dictionary... Mark set Press C-c C-c when you are done editing. Enter a change comment. Type C-c C-c when done Checking in /Users/roup/dev/elisp/pel/pel-setup.el...done Saving file /Users/roup/dev/elisp/pel/pel-vcs.el... Add 2023 to copyright? (y or n) y Wrote /Users/roup/dev/elisp/pel/pel-vcs.el Configured using: 'configure --disable-dependency-tracking --disable-silent-rules --enable-locallisppath=/usr/local/share/emacs/site-lisp --infodir=/usr/local/Cellar/emacs/26.3/share/info/emacs --prefix=/usr/local/Cellar/emacs/26.3 --with-gnutls --without-x --with-xml2 --without-dbus --with-modules --without-ns --without-imagemagick' Configured features: NOTIFY ACL GNUTLS LIBXML2 ZLIB MODULES THREADS Important settings: value of $LANG: en_CA.UTF-8 locale-coding-system: utf-8-unix Major mode: Emacs-Lisp Minor modes in effect: global-undo-tree-mode: t undo-tree-mode: t display-time-mode: t ido-everywhere: t which-key-mode: t winner-mode: t key-chord-mode: t global-anzu-mode: t anzu-mode: t diff-auto-refine-mode: t lispy-mode: t flyspell-mode: t show-paren-mode: t recentf-mode: t superword-mode: t tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t menu-bar-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 line-number-mode: t auto-fill-function: do-auto-fill transient-mark-mode: t abbrev-mode: t Load-path shadows: /Users/roup/.emacs.d/utils/benchmark-init hides /Users/roup/.emacs.d/elpa-complete/benchmark-init-20150905.938/benchmark-init /Users/roup/.emacs.d/utils/benchmark-init-modes hides /Users/roup/.emacs.d/elpa-complete/benchmark-init-20150905.938/benchmark-init-modes /Users/roup/.emacs.d/elpa-complete/git-modes-20221127.2150/gitattributes-mode hides /Users/roup/.emacs.d/elpa-complete/gitattributes-mode-20210426.2132/gitattributes-mode /Users/roup/.emacs.d/elpa-complete/git-modes-20221127.2150/gitconfig-mode hides /Users/roup/.emacs.d/elpa-complete/gitconfig-mode-20210426.2132/gitconfig-mode /Users/roup/.emacs.d/elpa-complete/git-modes-20221127.2150/gitignore-mode hides /Users/roup/.emacs.d/elpa-complete/gitignore-mode-20210426.2132/gitignore-mode /Users/roup/.emacs.d/utils/sr-speedbar hides /Users/roup/.emacs.d/elpa-complete/sr-speedbar-20161025.831/sr-speedbar /Users/roup/.emacs.d/elpa-complete/lispy-20210121.926/elpa hides /Users/roup/.emacs.d/elpa-complete/ivy-20210311.1638/elpa /Users/roup/.emacs.d/elpa-complete/lfe-mode-20201007.2214/lfe-indent hides /usr/local/share/emacs/site-lisp/lfe/lfe-indent /Users/roup/.emacs.d/elpa-complete/lfe-mode-20201007.2214/lfe-mode hides /usr/local/share/emacs/site-lisp/lfe/lfe-mode /Users/roup/.emacs.d/elpa-complete/lfe-mode-20201007.2214/inferior-lfe hides /usr/local/share/emacs/site-lisp/lfe/inferior-lfe /Users/roup/.emacs.d/elpa-complete/soap-client-3.2.0/soap-client hides /usr/local/Cellar/emacs/26.3/share/emacs/26.3/lisp/net/soap-client /Users/roup/.emacs.d/elpa-complete/soap-client-3.2.0/soap-inspect hides /usr/local/Cellar/emacs/26.3/share/emacs/26.3/lisp/net/soap-inspect /Users/roup/.emacs.d/elpa-complete/let-alist-1.0.6/let-alist hides /usr/local/Cellar/emacs/26.3/share/emacs/26.3/lisp/emacs-lisp/let-alist /Users/roup/.emacs.d/elpa-complete/seq-2.22/seq hides /usr/local/Cellar/emacs/26.3/share/emacs/26.3/lisp/emacs-lisp/seq /Users/roup/.emacs.d/elpa-complete/nadvice-0.3/nadvice hides /usr/local/Cellar/emacs/26.3/share/emacs/26.3/lisp/emacs-lisp/nadvice Features: (shadow mail-extr emacsbug sendmail pel-setup pel-setup-base pel-package pel-elpa pel-filedir pel-custom autoload lisp-mnt pel-browse browse-url warnings ielm pp pel-lisp rectangular-region-mode pulse sort pel-mark iedit iedit-lib mc-hide-unmatched-lines-mode mc-mark-more mc-cycle-cursors multiple-cursors-core rect dired-aux dired-hide-dotfiles eieio-opt ibuf-ext ibuffer ibuffer-loaddefs deadgrep rx spinner dash s pel-numkpad misearch multi-isearch iso-transl log-edit message rmc puny format-spec rfc822 mml mml-sec epa derived epg gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log whitespace vc-bzr vc-src vc-sccs pel-vc vc-svn vc-cvs vc-rcs vc-dir ewoc vc vc-dispatcher executable pel-whitespace time-stamp copyright pel-ccp disp-table fill-column-indicator smex pel-undo undo-tree diff windmove ido-completing-read+ memoize cus-edit cus-start cus-load minibuf-eldef ace-link time pel-skels-generic counsel xdg dired-x dired dired-loaddefs compile ido-grid ido pel-completion pel-ido pel-seq which-key indent-tools yafolding indent-tools-indentation-of winner key-seq pel-key-chord key-chord anzu vc-git diff-mode emacros map term/xterm xterm tempo pel-skels-elisp pel-text-insert pel-tempo pel-skels lispy pcase swiper cl-extra ivy flx ivy-faces ivy-overlay colir color delsel lispy-inline subr-x thingatpt avy noutline outline easy-mmode etags edebug lispy-tags mode-local find-func pel__hydra hydra lv pel-lispy pel-spell-iedit flyspell ispell pel-spell imenu+ pel-imenu imenu elec-pair paren pel_keys recentf tree-widget wid-edit two-column pel-erlang xref project pel-xref pel-text-transform pel-read pel-navigate cap-words superword subword pel-scroll pel-window pel-prompt pel-syntax pel--syntax-macros pel-fs pel-ffind comint regexp-opt ansi-color speedbar sb-image ezimage image dframe ls-lisp time-date delight pel-autoload pel--keys-macros pel--options pel--macros pel--base pel finder-inf geiser-impl help-fns radix-tree help-mode geiser-custom geiser-base ring info tool-bar edmacro kmacro package easymenu epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv benchmark-init advice cl-loaddefs cl-lib mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer select mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame 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 minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote threads kqueue multi-tty make-network-process emacs) Memory information: ((conses 16 627110 231620) (symbols 48 46532 6) (miscs 40 3027 4683) (strings 32 178124 47215) (string-bytes 1 4875582) (vectors 16 55561) (vector-slots 8 1752661 208034) (floats 8 703 5477) (intervals 56 8597 5478) (buffers 992 55)) -- /Pierre