bug#45443: 28.0.50; Can't find definition of compilation--message->loc

[Richard Stallman]

Trying to debug a bug in compile-goto-error on Rmail files,
I typed C-h f compilation--message->loc RET
then clicked on the file name -- which is supposed to find the definition
of that function.

It did not find the definition; instead it said,

    Unable to find location in file

I also tried M-x find-function RET compilation--message->loc RET.
It found a call to compilation--message->loc, not the definition.

I searched for that name in the file and did not find a definition.
I will try grepping for it.



In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32, cairo 
version 1.15.10)
 of 2020-12-08 built on freetop
Repository revision: 0155bd0fdb166c97a2ce76cc5bc64fd195a676d3
Repository branch: master
System Description: Trisquel GNU/Linux Etiona (9.0)

Configured using:
 'configure --with-gnutls=ifavailable 'CFLAGS=-O0 -g''

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK2 X11 XDBE XIM MODULES THREADS PDUMPER

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

Major mode: Help

Minor modes in effect:
  shell-dirtrack-mode: t
  gpm-mouse-mode: t
  tooltip-mode: t
  global-eldoc-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

Features:
(completion dos-w32 find-cmd find-dired whitespace cl-print debug
backtrace rmail-spam-filter rmailedit rmailsort undigest tramp-gvfs
zeroconf tramp-cache bug-reference shortdoc help-fns radix-tree
descr-text help-at-pt ispell unrmail time-stamp texinfo url-http
url-auth url-gw nsm tramp tramp-loaddefs trampver tramp-integration
tramp-compat ls-lisp arc-mode archive-mode srecode/srt-mode
semantic/analyze semantic/sort semantic/scope semantic/analyze/fcn
semantic/db semantic/format srecode/template srecode/srt-wy
semantic/wisent semantic/wisent/wisent semantic/ctxt srecode/ctxt
semantic/tag-ls semantic/find srecode/compile srecode/dictionary
srecode/fields srecode/table srecode eieio-base semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw
mode-local cedet pcmpl-unix rect compare-w novice kmacro etags
fileloop xref project quail mail-extr pp shadow emacsbug smerge-mode
diff log-edit pcvs-util add-log org-element avl-tree generator ol-eww
ol-rmail ol-mhe ol-irc ol-info ol-gnus nnselect gnus-search eieio-opt
speedbar ezimage dframe gnus-art mm-uu mml2015 mm-view mml-smime smime
dig gnus-sum gnus-group gnus-undo gnus-start gnus-dbus dbus gnus-cloud
nnimap nnmail mail-source utf7 netrc nnoo gnus-spec gnus-int
gnus-range gnus-win ol-docview doc-view jka-compr image-mode exif
ol-bibtex bibtex ol-bbdb ol-w3m org ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-macro org-footnote org-src ob-comint org-pcomplete
org-list org-faces org-entities noutline outline org-version
ob-emacs-lisp ob-core ob-eval org-table ol org-keys org-compat
org-macs org-loaddefs format-spec find-func cal-menu calendar
cal-loaddefs cl-extra parse-time iso8601 mhtml-mode css-mode smie eww
xdg url-queue mm-url gnus nnheader wid-edit color js imenu cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs sgml-mode help-mode mule-util shell pcomplete
thingatpt files-x grep compile comint ansi-color ring misearch
multi-isearch epa-mail rmailkwd rmailsum vc-mtn vc-hg vc-git diff-mode
easy-mmode vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs vc vc-dispatcher
shr kinsoku svg xml dom rmailout dabbrev mailalias sendmail qp rmailmm
message rmc puny rfc822 mml mml-sec epa epg epg-config gnus-util
text-property-search time-date mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader mail-parse rfc2231 rmail
rmail-loaddefs rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils dired-aux dired dired-loaddefs t-mouse term/linux view
derived paren cus-start cus-load advice finder-inf package easymenu
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 seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib iso-transl tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type 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
elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu 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 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 emacs)

Memory information:
((conses 16 1190950 169604)
 (symbols 48 45903 20)
 (strings 32 226599 25400)
 (string-bytes 1 5447911)
 (vectors 16 76348)
 (vector-slots 8 2114801 141195)
 (floats 8 441 551)
 (intervals 56 152476 898)
 (buffers 984 297))
[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]


-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)