bug#66025: 30.0.50; eldoc.el: eldoc--invoke-strategy: register-doc defined with 4 args, called with 5

[Vladimir Nikishkin]

Emacs master, hash f13b08be11533c546fed257dcf8e3812a53b672a

Line 883 in file eldoc.el defines a lexical function register-doc with 4
argumenst (pos string plist origin), which is later, at line 931, called
with 5 arguments, (register-doc 0 res nil nil
eldoc-documentation-strategy), which leads to an exception.

I encountered this error with mu4e, which is, I guess, using the "old
protocol" for its documentation functions. mu4e's documentation function
is mu4e-headers-eldoc-function, which returns a string. I haven't
understood the differences between the "new protocol" and the "old
protocol", but I guess, in the new protocol there is some callback to
call with the doc message, i.e. the function cannot just return a
string.


In GNU Emacs 30.0.50 (build 1, x86_64-slackware-linux-gnu, GTK+ Version
 3.24.31, cairo version 1.16.0) of 2023-09-14 built on
 laptop.lockywolf.net
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Slackware 15.0 x86_64

Configured using:
 'configure --prefix=/usr --libdir=/usr/lib64 --sysconfdir=/etc
 --localstatedir=/var --program-prefix= --program-suffix=
 --mandir=/usr/man --infodir=/usr/info --without-gconf
 --without-gsettings --with-modules --with-native-compilation=no
 --with-json --with-imagemagick --with-pdumper --with-xwidgets
 --enable-year2038 --with-tree-sitter --with-cairo-xcb
 --build=x86_64-slackware-linux 'CFLAGS=-O2 -fPIC -g''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM HARFBUZZ IMAGEMAGICK
JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE
XIM XINPUT2 XPM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LC_COLLATE: C
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: mu4e:headers

Minor modes in effect:
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  hes-mode: t
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  company-mode: t
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  which-function-mode: t
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  savehist-mode: t
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  save-place-mode: t
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  xterm-mouse-mode: t
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  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  size-indication-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
  auto-save-visited-mode: t
  abbrev-mode: t

Load-path shadows:
/home/lockywolf/.emacs.d/elpa/company-cmake-0.1/company-cmake hides 
/home/lockywolf/.emacs.d/elpa/company-20230303.2331/company-cmake
/home/lockywolf/OfficialRepos/org-noter/org-noter hides 
/home/lockywolf/.emacs.d/elpa/org-noter-20230728.2037/org-noter
/home/lockywolf/OfficialRepos/org-noter/org-noter-core hides 
/home/lockywolf/.emacs.d/elpa/org-noter-20230728.2037/org-noter-core
/home/lockywolf/.emacs.d/elpa/cmake-mode-20230323.1312/cmake-mode hides 
/usr/share/emacs/site-lisp/cmake-mode
/home/lockywolf/.emacs.d/elpa/bind-key-20230203.2004/bind-key hides 
/usr/share/emacs/30.0.50/lisp/use-package/bind-key
/home/lockywolf/.emacs.d/elpa/flim-20230205.1423/sasl hides 
/usr/share/emacs/30.0.50/lisp/net/sasl

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Memory information:
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-- 
Your sincerely,
Vladimir Nikishkin (MiEr, lockywolf)
(Laptop)