steps to reproduce this bug:

step 1: run: emacs -Q
step 2: eval (find-function 'erc)
step 3: the point goes to the defgroup of erc instead of the cl-defun of
it, which I think is wrong

wasamasa at #emacs:libera.chat helps to verify that this bug happens on
the master of emacs on March 11, 2022.

erc version is 5.4




In GNU Emacs 28.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, cairo version 1.16.0)
Repository revision: emacs-28.0.91
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: NixOS 22.05 (Quokka)

Configured using:
 'configure
 --prefix=/nix/store/ap3k7xlj8jh9x4gb98b0vbnn33kgqr96-emacs-gcc-28.0.91
 --disable-build-details --with-modules --with-x-toolkit=gtk3 --with-xft
 --with-cairo --with-native-compilation'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: /nix/store/l07j503hxm0q6inagnc911y2vsq1i8vj-emacs-packages-deps/share/emacs/site-lisp:/nix/store/sm1w0fpbybib0fwq669ch4agjdfb1hs5-emacs-packages-deps/share/emacs/site-lisp:
  value of $EMACSNATIVELOADPATH: /nix/store/l07j503hxm0q6inagnc911y2vsq1i8vj-emacs-packages-deps/share/emacs/native-lisp::
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
/nix/store/sm1w0fpbybib0fwq669ch4agjdfb1hs5-emacs-packages-deps/share/emacs/site-lisp/site-start hides /nix/store/l07j503hxm0q6inagnc911y2vsq1i8vj-emacs-packages-deps/share/emacs/site-lisp/site-start

Features:
(shadow sort mail-extr emacsbug sendmail mm-archive message dired
dired-loaddefs rfc822 mml mml-sec epa derived gnus-util rmail
rmail-loaddefs text-property-search time-date mailabbrev gmm-utils
mailheader mm-decode mm-bodies mm-encode mail-utils gnutls mule-util
network-stream url-http mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr url-gw nsm rmc puny url-cache url-auth epg rfc6068
epg-config finder-inf package browse-url url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
mailcap url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache json subr-x map url-vars misearch
multi-isearch cl-loaddefs cl-lib seq byte-opt gv bytecomp byte-compile
cconv jka-compr find-func iso-transl tooltip eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd 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 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 emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice
button loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 212408 11803)
 (symbols 48 8755 0)
 (strings 32 40745 2283)
 (string-bytes 1 1192908)
 (vectors 16 20578)
 (vector-slots 8 386857 19914)
 (floats 8 28 344)
 (intervals 56 17541 0)
 (buffers 992 16))