GNU bug report logs - #17836
24.3; `describe-fontset' confused about e.g. ?\C-@

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Samuel Bronson <naesten <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; `describe-fontset' confused about e.g. ?\C-@
Date: Sun, 22 Jun 2014 21:57:07 -0400

When I use `describe-fontset', I get output that starts out something
like:

--8<---------------cut here---------------start------------->8---
Fontset: -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-fontset-xterm.default
CHAR RANGE (CODE RANGE)
    FONT NAME (REQUESTED and [OPENED])
C-@ .. � (#x43 .. #x10FFFF)
    -Misc-Fixed-medium-r-semicondensed--13-*-75-75-c-120-ISO10646-1
--8<---------------cut here---------------end--------------->8---

Notice how #x43 is NOT a representation of `?\C-@' but, in fact, of
`?C'?  That's fairly strange bug.  (Why would you try to extract the
codepoints AFTER formatting the range as a string ...?)

(I also get an assload of xlfd descriptors full of asterisks and dashes,
with different registry-coding pairs...)

In GNU Emacs 24.3.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-05-16 on babin, modified by Debian
Windowing system distributor `Colin Harrison', version 11.0.60900031
System Description:	Debian GNU/Linux testing (jessie)

Configured using:
 `configure '--build' 'i486-linux-gnu' '--build' 'i486-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf'
 '--without-gsettings' 'build_alias=i486-linux-gnu' 'CFLAGS=-g -O2
 -fstack-protector --param=ssp-buffer-size=4 -Wformat
 -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_COLLATE: C
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode semantic-show-unmatched-syntax-mode)  S)))
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  xterm-mouse-mode: t
  show-paren-mode: t
  recentf-mode: t
  tooltip-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

Recent input:
<help-echo> <down-mouse-1> <mouse-1> <down-mouse-1> 
<mouse-1> <down-mouse-1> <mouse-1> <left> <left> M-x 
<up> <up> <up> <down> <down> <down> <down> C-h = C-h 
? <next> <prior> <next> <prior> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> q C-x b C-g 
M-x <up> <up> <down> <return> <up> <return> <down> 
C-x o <down> <down> <down> M-x d e s c <tab> c h <tab> 
<return> <C-home> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <end> <up> <up> <up> <down> 
<end> <down> <down> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <down> <down> <down> <down> <down> <up> <up> 
<up> <up> <up> <up> <down> <down> <down> <up> <up> 
<mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <help-echo> 
<down-mouse-1> <mouse-1> C-x b <return> C-x b <return> 
C-g <C-home> <C-end> <C-home> q <up> <up> <up> <up> 
<up> <end> <next> <next> <next> <C-end> M-x b <backspace> 
C-g <C-home> <C-end> <C-home> <C-end> <C-home> <C-end> 
M-x l i s t - c h a r <tab> s e t <tab> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> a c <tab> <return> 
<down> <down> <down> C-x o C-x o C-h f C-g M-x M-l 
i s t - f o <home> l <end> f <backspace> n t <tab> 
<return> C-x o <down> <down> <down> <end> <up> <up> 
<end> <down> <end> <down> <end> <up> <up> <end> <down> 
<down> <up> <up> <up> <up> <end> <down> <end> <up> 
<end> <end> <down> <end> <up> <home> <end> <down> <end> 
M-x <up> <up> <up> <up> <return> <up> <return> <down> 
<down> <down> <down> <down> <up> <up> <end> <down> 
<down> <down> <down> <next> <next> <next> <C-end> <C-home> 
<down> <down> <down> <up> <up> <up> <up> <down> <down> 
<down> <up> <up> <up> <up> <up> <S-down> <S-down> <S-down> 
<S-down> <S-down> M-w M-x e m a c s - b u g <tab> <home> 
r e p <tab> <backspace> <tab> <return>

Recent messages:
scroll-up-command: End of buffer [2 times]
Mark set
Quit
Mark set [6 times]
Making completion list...
byte-code: End of buffer [3 times]
Quit
Mark set [2 times]
byte-code: Beginning of buffer [3 times]
Mark set
0

Load-path shadows:
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/usr/share/emacs24/site-lisp/flim/md4 hides /usr/share/emacs/24.3/lisp/md4
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/usr/share/emacs24/site-lisp/flim/hex-util hides /usr/share/emacs/24.3/lisp/hex-util
/home/naesten/system/emacs/dist/elpa/json-1.2/json hides /usr/share/emacs/24.3/lisp/json
/home/naesten/system/emacs/dist/elisp/t-mouse hides /usr/share/emacs/24.3/lisp/t-mouse
/usr/share/emacs24/site-lisp/html-helper-mode/tempo hides /usr/share/emacs/24.3/lisp/tempo
/usr/share/emacs24/site-lisp/css-mode/css-mode hides /usr/share/emacs/24.3/lisp/textmodes/css-mode
/usr/share/emacs/site-lisp/rst hides /usr/share/emacs/24.3/lisp/textmodes/rst
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/usr/share/emacs24/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/24.3/lisp/textmodes/flyspell
/usr/share/emacs24/site-lisp/flim/sasl-digest hides /usr/share/emacs/24.3/lisp/net/sasl-digest
/usr/share/emacs24/site-lisp/flim/sasl-cram hides /usr/share/emacs/24.3/lisp/net/sasl-cram
/usr/share/emacs24/site-lisp/flim/hmac-md5 hides /usr/share/emacs/24.3/lisp/net/hmac-md5
/usr/share/emacs24/site-lisp/flim/hmac-def hides /usr/share/emacs/24.3/lisp/net/hmac-def
/usr/share/emacs24/site-lisp/flim/sasl-ntlm hides /usr/share/emacs/24.3/lisp/net/sasl-ntlm
/usr/share/emacs24/site-lisp/flim/ntlm hides /usr/share/emacs/24.3/lisp/net/ntlm
/usr/share/emacs24/site-lisp/flim/sasl hides /usr/share/emacs/24.3/lisp/net/sasl
/usr/share/emacs24/site-lisp/wl/rfc2368 hides /usr/share/emacs/24.3/lisp/mail/rfc2368
/home/naesten/system/emacs/dist/elisp/package hides /usr/share/emacs/24.3/lisp/emacs-lisp/package
/home/naesten/system/emacs/dist/elpa/tabulated-list-0/tabulated-list hides /usr/share/emacs/24.3/lisp/emacs-lisp/tabulated-list
/usr/share/emacs24/site-lisp/auctex/toolbar-x hides /usr/share/emacs/site-lisp/auctex/toolbar-x
/usr/share/emacs24/site-lisp/auctex/tex-style hides /usr/share/emacs/site-lisp/auctex/tex-style
/usr/share/emacs24/site-lisp/auctex/tex-bar hides /usr/share/emacs/site-lisp/auctex/tex-bar
/usr/share/emacs24/site-lisp/auctex/tex-fold hides /usr/share/emacs/site-lisp/auctex/tex-fold
/usr/share/emacs24/site-lisp/auctex/preview hides /usr/share/emacs/site-lisp/auctex/preview
/usr/share/emacs24/site-lisp/auctex/context hides /usr/share/emacs/site-lisp/auctex/context
/usr/share/emacs24/site-lisp/auctex/context-nl hides /usr/share/emacs/site-lisp/auctex/context-nl
/usr/share/emacs24/site-lisp/auctex/prv-emacs hides /usr/share/emacs/site-lisp/auctex/prv-emacs
/usr/share/emacs24/site-lisp/auctex/context-en hides /usr/share/emacs/site-lisp/auctex/context-en
/usr/share/emacs24/site-lisp/auctex/tex-jp hides /usr/share/emacs/site-lisp/auctex/tex-jp
/usr/share/emacs24/site-lisp/auctex/plain-tex hides /usr/share/emacs/site-lisp/auctex/plain-tex
/usr/share/emacs24/site-lisp/auctex/bib-cite hides /usr/share/emacs/site-lisp/auctex/bib-cite
/usr/share/emacs24/site-lisp/auctex/tex-font hides /usr/share/emacs/site-lisp/auctex/tex-font
/usr/share/emacs24/site-lisp/auctex/tex-mik hides /usr/share/emacs/site-lisp/auctex/tex-mik
/usr/share/emacs24/site-lisp/auctex/font-latex hides /usr/share/emacs/site-lisp/auctex/font-latex
/usr/share/emacs24/site-lisp/auctex/texmathp hides /usr/share/emacs/site-lisp/auctex/texmathp
/usr/share/emacs24/site-lisp/auctex/tex-info hides /usr/share/emacs/site-lisp/auctex/tex-info
/usr/share/emacs24/site-lisp/auctex/latex hides /usr/share/emacs/site-lisp/auctex/latex
/usr/share/emacs24/site-lisp/auctex/multi-prompt hides /usr/share/emacs/site-lisp/auctex/multi-prompt
/usr/share/emacs24/site-lisp/auctex/tex hides /usr/share/emacs/site-lisp/auctex/tex
/usr/share/emacs24/site-lisp/auctex/tex-buf hides /usr/share/emacs/site-lisp/auctex/tex-buf
/usr/share/emacs24/site-lisp/html-helper-mode/hhm-config hides /usr/share/emacs/site-lisp/html-helper-mode/hhm-config
/usr/share/emacs24/site-lisp/html-helper-mode/visual-basic-mode hides /usr/share/emacs/site-lisp/html-helper-mode/visual-basic-mode
/usr/share/emacs24/site-lisp/html-helper-mode/tempo hides /usr/share/emacs/site-lisp/html-helper-mode/tempo
/usr/share/emacs24/site-lisp/html-helper-mode/html-helper-mode hides /usr/share/emacs/site-lisp/html-helper-mode/html-helper-mode
/usr/share/emacs24/site-lisp/mailcrypt/mc-toplev hides /usr/share/emacs/site-lisp/mailcrypt/mc-toplev
/usr/share/emacs24/site-lisp/mailcrypt/mc-remail hides /usr/share/emacs/site-lisp/mailcrypt/mc-remail
/usr/share/emacs24/site-lisp/mailcrypt/mc-pgp6 hides /usr/share/emacs/site-lisp/mailcrypt/mc-pgp6
/usr/share/emacs24/site-lisp/mailcrypt/mc-pgp5 hides /usr/share/emacs/site-lisp/mailcrypt/mc-pgp5
/usr/share/emacs24/site-lisp/mailcrypt/mc-pgp hides /usr/share/emacs/site-lisp/mailcrypt/mc-pgp
/usr/share/emacs24/site-lisp/mailcrypt/mc-gpg hides /usr/share/emacs/site-lisp/mailcrypt/mc-gpg
/usr/share/emacs24/site-lisp/mailcrypt/mailcrypt hides /usr/share/emacs/site-lisp/mailcrypt/mailcrypt
/usr/share/emacs24/site-lisp/mailcrypt/expect hides /usr/share/emacs/site-lisp/mailcrypt/expect
/usr/share/emacs24/site-lisp/mailcrypt/mc-setversion hides /usr/share/emacs/site-lisp/mailcrypt/mc-setversion
/usr/share/emacs24/site-lisp/psgml/psgml-edit hides /usr/share/emacs/site-lisp/psgml/psgml-edit
/usr/share/emacs24/site-lisp/psgml/psgml-charent hides /usr/share/emacs/site-lisp/psgml/psgml-charent
/usr/share/emacs24/site-lisp/psgml/psgml hides /usr/share/emacs/site-lisp/psgml/psgml
/usr/share/emacs24/site-lisp/psgml/psgml-other hides /usr/share/emacs/site-lisp/psgml/psgml-other
/usr/share/emacs24/site-lisp/psgml/psgml-api hides /usr/share/emacs/site-lisp/psgml/psgml-api
/usr/share/emacs24/site-lisp/psgml/psgml-sysdep hides /usr/share/emacs/site-lisp/psgml/psgml-sysdep
/usr/share/emacs24/site-lisp/psgml/psgml-init hides /usr/share/emacs/site-lisp/psgml/psgml-init
/usr/share/emacs24/site-lisp/psgml/psgml-parse hides /usr/share/emacs/site-lisp/psgml/psgml-parse
/usr/share/emacs24/site-lisp/psgml/psgml-info hides /usr/share/emacs/site-lisp/psgml/psgml-info
/usr/share/emacs24/site-lisp/psgml/psgml-ids hides /usr/share/emacs/site-lisp/psgml/psgml-ids
/usr/share/emacs24/site-lisp/psgml/psgml-dtd hides /usr/share/emacs/site-lisp/psgml/psgml-dtd
/usr/share/emacs/24.3/lisp/gnus/.dir-locals hides /home/naesten/system/emacs/dist/elisp/magit/.dir-locals

Features:
(thai-util thai-word files-x boxquote eldoc mule-diag noutline outline
checkdoc elint canlock mo-git-blame vc-annotate autorevert log4j-mode
gnus-html vcard-autoloads bbdb-w3 vc-bzr vc-sccs vc-svn vc-cvs vc-rcs
gitignore-mode gitconfig-mode-autoloads gitignore-mode-autoloads
mu-register mu-cite alist std11 pcustom poem poem-e20 poem-e20_3 pces
pces-e20 pces-20 broken poe pym static apel-ver product informat
footnote crm latex tex-style tex-info texinfo tex nndoc nnmairix nnml
nnir gnus-sync json gnus-sieve deuglify gnus-notifications gnus-fun
notifications dbus xml gnus-dup gnus-demon gnus-delay gnus-draft
gnus-bookmark time-stamp ede/generic semantic/db semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw mode-local
ede/shell eieio-opt find-dired locate ede/dired ede/emacs ede/cpp-root
ede/speedbar ede/files ede ede/base ede/auto ede/source eieio-speedbar
speedbar sb-image ezimage dframe eieio-custom cedet ebrowse ebuff-menu
autoconf autoconf-mode gnus-diary nndiary occur-x-autoloads package-x
descr-text shadow emacsbug tmm url-handlers nnweb mm-url nnregistry
html-mode jsp-html-helper-mode asp-html-helper-mode php-html-helper-mode
html-helper-mode w3m-form w3m-cookie w3m-bookmark w3m-tabmenu
w3m-session w3m doc-view image-mode w3m-hist w3m-fb bookmark-w3m w3m-ems
w3m-ccl ccl w3m-favicon w3m-image w3m-proc w3m-util gnus-cus conf-mode
python xmtn-dvc dvc-status xmtn-conflicts xmtn-ids xmtn-match
xmtn-automate xmtn-compat xmtn-run xmtn-basic-io xmtn-base sh-script
smie executable tramp-sh debian-control-mode debian-bts-control
debian-changelog-mode tramp-cache rx tramp tramp-compat tramp-loaddefs
shell pcomplete dpkg-dev-el-loaddefs ido find-file-in-git-repo dired-aux
loadhist autoload lisp-mnt url-http url-gw url-cache url-auth finder-inf
cperl-mode perl-mode tabify man make-mode debug gnus-salt gnus-kill
uudecode flow-fill spam-report mule-util gnus-async gnus-bcklg
gnus-topic nndraft nnmh nnfolder bbdb-gnus nnnil gnus-registry registry
eieio-base spam spam-stat gnus-uu yenc gnus-eform gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-ml netrc gnutls network-stream
starttls tls nntp gnus-cache psgml-info shr mm-archive psgml-dtd
psgml-parse psgml-api psgml-ids psgml-other psgml-sysdep psgml-edit
browse-url sgml-mode psgml psgml-html info cpp apropos face-remap
bbdb-hooks cc-langs inform-mode imenu term disp-table ehelp electric
ispell qp rmailmm rmail two-column iso-transl misearch multi-isearch
jka-compr parse-time smiley gnus-cite gnus-msg gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig gnus-sum nnoo gnus-group
gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
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mailcrypt message sendmail format-spec rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev mail-utils gmm-utils
mailheader reporter help-mode debian-bug rfc2047 rfc2045 ietf-drums
vc-git xgit-dvc xgit cus-edit xgit-annotate rect dvc-annotate xgit-log
dvc-revlist dvc-diff uniquify dvc-fileinfo bzr-core tla-core pp
tla-autoconf tla-defs dvc-log dvc-unified dvc-tips dired-x dired ffap
commit-patch-buffer log-edit pcvs-util add-log vc vc-dispatcher
diff-mode easy-mmode ediff-merg ediff-diff ediff-wind ediff-help
ediff-util ediff-mult ediff-init ediff xdarcs-core xgit-core xhg-core
xmtn-minimal server derived xcscope arc-mode archive-mode asm-mode
my-asm slime-autoloads dvc-autoloads dvc-core dvc-lisp dvc-buffers
dvc-ui dvc-register dvc-utils dvc-emacs ewoc dvc-defs dvc-site cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
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comint ansi-color ring edebug warnings trace xt-mouse paren recentf
tree-widget wid-edit cus-start cus-load eldoc-eval-autoloads
elisp-cache-autoloads erc-hl-nicks-autoloads
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yagist-autoloads json-autoloads yasnippet-bundle-autoloads
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easymenu assoc package find-func cl-macs gv w3m-load psgml-init
proof-site proof-autoloads pg-vars mmm-auto mmm-vars mmm-compat cl
cl-lib mailcrypt-init haskell-mode-autoloads edmacro kmacro tempo url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util url-parse auth-source eieio byte-opt bytecomp
byte-compile cconv gnus-util time-date mm-util mail-prsvr password-cache
url-vars mailcap xml-parse doxymacs debian-el debian-el-loaddefs
bbdb-autoloads preview-latex tex-site auto-loads tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
font-render-setting x-toolkit x multi-tty emacs)

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Message #8 received at 17836 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Samuel Bronson <naesten <at> gmail.com>
Cc: 17836 <at> debbugs.gnu.org
Subject: Re: bug#17836: 24.3; `describe-fontset' confused about e.g. ?\C-@
Date: Mon, 23 Jun 2014 19:17:01 +0300

> From: Samuel Bronson <naesten <at> gmail.com>
> Date: Sun, 22 Jun 2014 21:57:07 -0400
> 
> Fontset: -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-fontset-xterm.default
> CHAR RANGE (CODE RANGE)
>     FONT NAME (REQUESTED and [OPENED])
> C-@ .. � (#x43 .. #x10FFFF)
>     -Misc-Fixed-medium-r-semicondensed--13-*-75-75-c-120-ISO10646-1
> --8<---------------cut here---------------end--------------->8---
> 
> Notice how #x43 is NOT a representation of `?\C-@' but, in fact, of
> `?C'?

That's because print-fontset-element does this:

  (beginning-of-line)
  (let ((from (following-char))

IOW, it assumes that there's a single character there, not a
human-readable description of a character, such as "C-@".

How about submitting a patch that uses 'kbd', say?

> Why would you try to extract the codepoints AFTER formatting the
> range as a string ...?

Because the formatting of the codepoints is done by describe-vector,
which doesn't pass the codepoints to print-fontset-element.  So it
needs to reverse-engineer the codepoints from the text that was
already inserted into the buffer.

Message #11 received at 17836 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: naesten <at> gmail.com
Cc: 17836 <at> debbugs.gnu.org
Subject: Re: bug#17836: 24.3; `describe-fontset' confused about e.g. ?\C-@
Date: Mon, 23 Jun 2014 19:39:43 +0300

> Date: Mon, 23 Jun 2014 19:17:01 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 17836 <at> debbugs.gnu.org
> 
> > From: Samuel Bronson <naesten <at> gmail.com>
> > Date: Sun, 22 Jun 2014 21:57:07 -0400
> > 
> > Fontset: -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-fontset-xterm.default
> > CHAR RANGE (CODE RANGE)
> >     FONT NAME (REQUESTED and [OPENED])
> > C-@ .. � (#x43 .. #x10FFFF)
> >     -Misc-Fixed-medium-r-semicondensed--13-*-75-75-c-120-ISO10646-1
> > --8<---------------cut here---------------end--------------->8---
> > 
> > Notice how #x43 is NOT a representation of `?\C-@' but, in fact, of
> > `?C'?
> 
> That's because print-fontset-element does this:
> 
>   (beginning-of-line)
>   (let ((from (following-char))
> 
> IOW, it assumes that there's a single character there, not a
> human-readable description of a character, such as "C-@".
> 
> How about submitting a patch that uses 'kbd', say?

Or maybe describe-vector should accept 2 more arguments and pass it to
print-fontset-element.

Message #14 received at 17836 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Samuel Bronson <naesten <at> gmail.com>
Cc: 17836 <at> debbugs.gnu.org
Subject: Re: bug#17836: 24.3; `describe-fontset' confused about e.g. ?\C-@
Date: Sun, 03 Nov 2019 17:34:39 +0100

Samuel Bronson <naesten <at> gmail.com> writes:

> When I use `describe-fontset', I get output that starts out something
> like:
>
> Fontset: -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-fontset-xterm.default
> CHAR RANGE (CODE RANGE)
>     FONT NAME (REQUESTED and [OPENED])
> C-@ .. � (#x43 .. #x10FFFF)
>     -Misc-Fixed-medium-r-semicondensed--13-*-75-75-c-120-ISO10646-1
>
> Notice how #x43 is NOT a representation of `?\C-@' but, in fact, of
> `?C'?  That's fairly strange bug.  (Why would you try to extract the
> codepoints AFTER formatting the range as a string ...?)

Weirdly enough, I'm not able to reproduce this bug reliably.  Sometimes
I get

Fontset: -PfEd-DejaVu Sans Mono-normal-normal-normal-*-25-*-*-*-m-0-fontset-startup
CHAR RANGE (CODE RANGE)
    FONT NAME (REQUESTED and [OPENED])
C-@ .. DEL
    -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1

(i.e., without the hex range) and sometimes I get

Fontset: -PfEd-DejaVu Sans Mono-normal-normal-normal-*-25-*-*-*-m-0-fontset-startup
CHAR RANGE (CODE RANGE)
    FONT NAME (REQUESTED and [OPENED])
C-@ .. <REMOVED> (#x43 .. #x3FFF7F)
    -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1

Hm...  Oh, the first time I run the command in a fresh Emacs, I get the
latter?  Perhaps displaying the buffer loaded a bunch of fonts that then
made this first (large) range go away?

Anyway, it seems like this bug is still present in Emacs 27, and there's
possibly a new bug, too, with not displaying the hex values in some
instances.

Eli did pinpoint what the reason for the original bug was, though:

> That's because print-fontset-element does this:
>
>   (beginning-of-line)
>   (let ((from (following-char))
>
> IOW, it assumes that there's a single character there, not a
> human-readable description of a character, such as "C-@".
>
> How about submitting a patch that uses 'kbd', say?

I'll take a whack at implementing that.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #17 received at 17836 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Samuel Bronson <naesten <at> gmail.com>
Cc: 17836 <at> debbugs.gnu.org
Subject: Re: bug#17836: 24.3; `describe-fontset' confused about e.g. ?\C-@
Date: Fri, 20 Aug 2021 16:36:29 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Anyway, it seems like this bug is still present in Emacs 27, and there's
> possibly a new bug, too, with not displaying the hex values in some
> instances.

No, I think that's apparently OK...

> Eli did pinpoint what the reason for the original bug was, though:
>
>> That's because print-fontset-element does this:
>>
>>   (beginning-of-line)
>>   (let ((from (following-char))
>>
>> IOW, it assumes that there's a single character there, not a
>> human-readable description of a character, such as "C-@".
>>
>> How about submitting a patch that uses 'kbd', say?
>
> I'll take a whack at implementing that.

Now pushed to Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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