Hi, The commit referenced above seems to break Eglot. It generates the following stack trace: Debugger entered--Lisp error: (unbound-slot eglot-lsp-server "#" -events-buffer oref) signal(unbound-slot (eglot-lsp-server "#" -events-buffer oref)) ... ; Removing extremely long frames eieio-barf-if-slot-unbound(eieio--unbound # -events-buffer oref) slot-value(# -events-buffer) #f(compiled-function (this) "Retrieve the slot `-events-buffer' from an object of class\n`jsonrpc-connection'." #)(#) apply(#f(compiled-function (this) "Retrieve the slot `-events-buffer' from an object of class\n`jsonrpc-connection'." #) # nil) jsonrpc--events-buffer(#) jsonrpc-events-buffer(#) jsonrpc--log-event(# (:message "Running language server: /usr/lib/llvm/17/bin/clangd")) jsonrpc--debug(# "Running language server: %s" "/usr/lib/llvm/17/bin/clangd") eglot--connect((c-mode c-ts-mode c++-mode c++-ts-mode objc-mode) (transient . "/tmp/") eglot-lsp-server ("/usr/lib/llvm/17/bin/clangd") ("c" "c" "c++" "c++" "objc")) eglot((c-mode c-ts-mode c++-mode c++-ts-mode objc-mode) (transient . "/tmp/") eglot-lsp-server ("/usr/lib/llvm/17/bin/clangd") ("c" "c" "c++" "c++" "objc") t) funcall-interactively(eglot (c-mode c-ts-mode c++-mode c++-ts-mode objc-mode) (transient . "/tmp/") eglot-lsp-server ("/usr/lib/llvm/17/bin/clangd") ("c" "c" "c++" "c++" "objc") t) command-execute(eglot record) execute-extended-command(nil "eglot" "eglot") funcall-interactively(execute-extended-command nil "eglot" "eglot") command-execute(execute-extended-command) Reproduction steps: - emacs -q - C-x C-f foo.c RET - M-x eglot RET Apologies for my brevity and lack of analysis and/or a patch - it is getting late. Have a lovely night. (note that the info below does not come from the emacs -q session I was testing this in, but I can also reproduce this issue in this session) In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo version 1.18.0) of 2023-11-28 built on localhost Repository revision: 7a5c91a2831602c3cd961158cf0b6a876852d7ac Repository branch: master System Description: Gentoo Linux 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 --datarootdir=/usr/share --disable-silent-rules --docdir=/usr/share/doc/emacs-30.0.9999 --htmldir=/usr/share/doc/emacs-30.0.9999/html --libdir=/usr/lib64 --program-suffix=-emacs-30-vcs --includedir=/usr/include/emacs-30-vcs --infodir=/usr/share/info/emacs-30-vcs --localstatedir=/var --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp --without-compress-install --without-hesiod --without-pop --with-file-notification=inotify --with-pdumper --enable-acl --enable-xattr --with-dbus --with-modules --with-gameuser=:gamestat --with-libgmp --with-gpm --with-native-compilation=aot --with-json --without-kerberos --without-kerberos5 --with-lcms2 --with-xml2 --with-mailutils --without-selinux --without-small-ja-dic --with-sqlite3 --with-gnutls --with-libsystemd --with-threads --with-tree-sitter --without-wide-int --with-sound=alsa --with-zlib --with-pgtk --without-x --without-ns --with-toolkit-scroll-bars --without-gconf --without-gsettings --with-harfbuzz --with-libotf --with-m17n-flt --with-xwidgets --with-gif --with-jpeg --with-png --with-rsvg --with-tiff --with-webp --without-imagemagick --with-dumping=pdumper 'CFLAGS=-freport-bug -O3 -ggdb3 -pipe -fdiagnostics-color=always -march=x86-64-v2 -flto' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed -O3 -Wl,-O3 -pipe -fdiagnostics-color=always -Wl,--defsym=__gentoo_check_ldflags__=0 -Wl,-z,pack-relative-relocs -Wl,--build-id -flto'' Configured features: ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM HARFBUZZ JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS GTK3 ZLIB Important settings: value of $LC_TIME: en_GB.UTF-8 value of $LANG: en_US.utf8 locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: global-git-commit-mode: t magit-auto-revert-mode: t TeX-PDF-mode: t diff-hl-flydiff-mode: t global-jinx-mode: t savehist-mode: t save-place-mode: t desktop-save-mode: t global-hl-line-mode: t mu4e-modeline-mode: t corfu-popupinfo-mode: t global-corfu-mode: t corfu-mode: t marginalia-mode: t vertico-mouse-mode: t vertico-mode: t which-key-mode: t global-display-fill-column-indicator-mode: t display-fill-column-indicator-mode: t which-function-mode: t electric-pair-mode: t global-whitespace-mode: t override-global-mode: t tooltip-mode: t global-eldoc-mode: t show-paren-mode: t electric-indent-mode: t mouse-wheel-mode: t tab-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t minibuffer-regexp-mode: t column-number-mode: t line-number-mode: t indent-tabs-mode: t transient-mark-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t Load-path shadows: /usr/share/emacs/site-lisp/cmake-mode hides /usr/share/emacs/site-lisp/cmake/cmake-mode /usr/share/emacs/site-lisp/desktop-entry-mode hides /usr/share/emacs/site-lisp/desktop-file-utils/desktop-entry-mode /usr/share/emacs/site-lisp/ninja/ninja-mode hides /usr/share/emacs/site-lisp/ninja-kitware/ninja-mode /usr/share/emacs/site-lisp/transient/transient hides /usr/share/emacs/30.0.50/lisp/transient Features: (shadow emacsbug view woman man org-clock dabbrev cape completion image-file image-converter sort smiley gnus-cite mm-archive mail-extr qp textsec uni-scripts idna-mapping ucs-normalize uni-confusable textsec-check magit-bookmark git-rebase magit-extras magit-sparse-checkout magit-gitignore magit-ediff ediff ediff-merg ediff-mult ediff-wind ediff-diff ediff-help ediff-init ediff-util magit-subtree magit-patch magit-submodule magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote magit-commit magit-sequence magit-notes magit-worktree magit-tag magit-merge magit-branch magit-reset magit-files magit-refs magit-status magit package url-handlers magit-repos magit-apply magit-wip magit-log magit-diff smerge-mode git-commit log-edit magit-core magit-autorevert magit-margin magit-transient magit-process with-editor comp comp-cstr server magit-mode transient magit-git magit-base magit-section cursor-sensor face-remap shortdoc pulse consult-xref disass misearch multi-isearch help-fns radix-tree cl-print cus-start eglot external-completion jsonrpc xref ert debug backtrace tramp-cache time-stamp consult pcmpl-unix em-unix em-term term ehelp em-script em-prompt em-pred em-ls em-hist em-glob em-extpipe em-cmpl em-dirs em-basic em-banner em-alias esh-mode esh-var eshell esh-cmd esh-ext esh-opt esh-proc esh-io esh-arg esh-module esh-groups esh-util vertico-directory add-log tar-mode arc-mode archive-mode font-latex preview latex latex-flymake tex-ispell tex-style tex-mode tex-info tex crm texmathp texinfo texinfo-loaddefs typescript-mode mhtml-mode css-mode js c-ts-common conf-mode flycheck-pkgcheck meson-mode tcl ruby-mode cperl-mode rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc rng-uri rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns nxml-mode nxml-outln nxml-rap sgml-mode facemenu nxml-util nxml-enc xmltok flymake-cc flymake compile warnings yaml-mode autoconf-mode python project pcase dired-aux make-mode ld-script m4-mode info cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs autorevert vc-git diff-hl-flydiff diff diff-hl log-view pcvs-util vc-dir ewoc vc vc-dispatcher diff-mode jinx ebuild-mode skeleton sh-script smie treesit executable display-line-numbers oc-basic org-element org-persist org-id org-refile avl-tree generator ol-eww eww url-queue mm-url ol-rmail ol-mhe ol-irc ol-info ol-gnus nnselect ol-docview doc-view filenotify jka-compr image-mode exif ol-bibtex bibtex ol-bbdb ol-w3m ol-doi org-link-doi savehist saveplace tramp-sh tramp trampver tramp-integration files-x tramp-message tramp-compat xdg shell tramp-loaddefs desktop frameset cus-load mu4e mu4e-org mu4e-notification notifications mu4e-main mu4e-view thingatpt gnus-art mm-uu mml2015 mm-view mml-smime smime gnutls dig gnus-sum gnus-group gnus-undo gnus-start gnus-dbus dbus comp-run comp-common gnus-cloud nnimap nnmail mail-source utf7 nnoo parse-time iso8601 gnus-spec gnus-int gnus-range gnus-win gnus nnheader range wid-edit mu4e-headers mu4e-compose mu4e-draft mu4e-actions smtpmail mu4e-search mu4e-lists mu4e-bookmarks mu4e-mark mu4e-message shr pixel-fill kinsoku url-file browse-url url url-proxy url-privacy url-expand url-methods url-history url-cookie generate-lisp-file url-domsuf url-util flow-fill mule-util hl-line mu4e-contacts mu4e-update mu4e-folders mu4e-context mu4e-query-items mu4e-server mu4e-modeline mu4e-vars mu4e-helpers mu4e-config mu4e-window bookmark pp ido message sendmail mailcap 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 mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader mu4e-obsolete auth-source-pass url-parse url-vars auth-source eieio eieio-core password-cache modus-vivendi-tinted-theme modus-themes kind-icon svg-lib color svg dom xml corfu-popupinfo corfu orderless marginalia vertico-mouse vertico compat flycheck json map dash org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-src ob-comint org-pcomplete pcomplete comint ansi-osc ansi-color org-list org-footnote org-faces org-entities time-date noutline outline ob-emacs-lisp ob-core ob-eval org-cycle org-table ol rx org-fold org-fold-core org-keys oc org-loaddefs find-func cal-menu calendar cal-loaddefs org-version org-compat org-macs format-spec which-key ace-window subr-x avy ring edmacro kmacro byte-opt display-fill-column-indicator disp-table which-func imenu elec-pair icons whitespace cl-macs gv cl-extra help-mode cl-seq use-package use-package-ensure use-package-delight use-package-diminish use-package-bind-key bind-key easy-mmode use-package-core cl-loaddefs cl-lib bytecomp byte-compile site-gentoo preview-latex ess-autoloads ess-generics tex-site rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/pgtk-win pgtk-win term/common-win pgtk-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 xwidget-internal dbusbind inotify dynamic-setting font-render-setting cairo gtk pgtk lcms2 multi-tty move-toolbar make-network-process native-compile emacs) Memory information: ((conses 16 1820713 3119067) (symbols 48 62485 159) (strings 32 319528 93051) (string-bytes 1 11499903) (vectors 16 193722) (vector-slots 8 3684047 2741445) (floats 8 936 13963) (intervals 56 100361 18396) (buffers 992 330)) -- Arsen Arsenović