bug#64784: 30.0.50; Eglot: Lisp error: (wrong-type-argument number-or-marker-p return) in eglot--post-self-insert-hook

[Tassilo Horn]

I'm in a rust-ts-mode buffer and ran eglot.  When I hit RET (bound to
newline), I get the following error:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p return)
  eglot--post-self-insert-hook()
  self-insert-command(1)
  newline(nil 1)
  funcall-interactively(newline nil 1)
  call-interactively(newline nil nil)
  command-execute(newline)


In GNU Emacs 30.0.50 (build 56, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-07-21 built on thinkpad-t440p
Repository revision: c55e67081e9873a32b6e665e44f3e5a9c301255f
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-tree-sitter --with-pgtk --with-modules'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PGTK
PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Rust

Minor modes in effect:
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  eglot--managed-mode: t
  flymake-mode: t
  display-fill-column-indicator-mode: t
  display-line-numbers-mode: t
  hexl-follow-ascii: t
  cargo-minor-mode: t
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  hl-todo-mode: t
  global-aggressive-indent-mode: t
  aggressive-indent-mode: t
  pdf-occur-global-minor-mode: t
  diredfl-global-mode: t
  mu4e-modeline-mode: t
  which-key-mode: t
  highlight-parentheses-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  server-mode: t
  bug-reference-prog-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  vertico-mode: t
  marginalia-mode: t
  minibuffer-depth-indicate-mode: t
  switchy-window-minor-mode: t
  electric-pair-mode: t
  recentf-mode: t
  pixel-scroll-precision-mode: t
  pixel-scroll-mode: t
  override-global-mode: t
  repeat-mode: t
  save-place-mode: t
  savehist-mode: t
  puni-global-mode: t
  puni-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: 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

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~/Repos/el/mu/mu4e/mu4e-mime-parts hides 
~/Repos/el/mu/build/mu4e/mu4e-mime-parts
/home/horn/.emacs.d/elpa/transient-20230602.2121/transient hides 
/home/horn/Repos/el/emacs/lisp/transient

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Memory information:
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 (string-bytes 1 6997482) (vectors 16 99513) (vector-slots 8 1205973 165006)
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