1. `emacs -Q`
 2. Open a src file and `M-x eglot`
 3. Get the following message:

 ```
 Loading project (native compiled elisp)...done
 Loading eldoc (native compiled elisp)...done
 Loading seq (native compiled elisp)...done
 Loading flymake (native compiled elisp)...done
 Loading xref (native compiled elisp)...done
 Loading jsonrpc (native compiled elisp)...done
 Loading external-completion (native compiled elisp)...done
 Unbound slot: eglot-lsp-server, "#<eglot-lsp-server
 eglot-lsp-server-1feea1d8dd60>", -events-buffer, oref
 error in process filter: Unbound slot: eglot-lsp-server,
 "#<eglot-lsp-server eglot-lsp-server-1feea1d8dd60>", -events-buffer, oref
 [2 times]
 ```

 I tested `.c` using `c-mode` or `c-ts-mode`, `.rs` with `rust-ts-mode`,
 all of them show the above error, so I guess it's not major mode's problem.

---

In GNU Emacs 30.0.50 (build 1, x86_64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.7.1 (Build 21G920)) of 2023-11-27 built on
 dalum.local
Repository revision: 2407f810136739da376ff0929b247a49dc196299
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.7.1

Configured using:
 'configure --with-native-compilation=aot'

Configured features:
ACL DBUS GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

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

Major mode: C/*