bug#36058: 27.0.50; add-text-properties called with nil for beg and end

[Mark A. Hershberger]

I have a function called totd (following patch) that is invoked at startup and 
it is
causing the attached backtrace when make-text-button is called with nil
for beg and end.

The following patch fixes this.

1 file changed, 10 insertions(+), 7 deletions(-)
lisp/button.el | 17 ++++++++++-------

modified   lisp/button.el
@@ -345,13 +345,16 @@ make-text-button
       (setcar type-entry 'category)
       (setcar (cdr type-entry)
              (button-category-symbol (car (cdr type-entry)))))
-    ;; Now add all the text properties at once
-    (add-text-properties beg end
-                         ;; Each button should have a non-eq `button'
-                         ;; property so that next-single-property-change can
-                         ;; detect boundaries reliably.
-                         (cons 'button (cons (list t) properties))
-                         object)
+    (when (and (integer-or-marker-p beg)
+               (integer-or-marker-p end))
+      ;; Now add all the text properties at once
+      (add-text-properties beg end
+                           ;; Each button should have a non-eq
+                           ;; `button' property so that
+                           ;; next-single-property-change can detect
+                           ;; boundaries reliably.
+                           (cons 'button (cons (list t) properties))
+                           object))
     ;; Return something that can be used to get at the button.
     (or object beg)))


(defun totd ()
    "Generate the tip of the day."
    (interactive)
    (with-output-to-temp-buffer "*Tip of the day*"
      (let* ((commands (loop for s being the symbols
                             when (commandp s) collect s))
             (command (nth (random (length commands)) commands)))
        (princ
         (concat "Your tip for the day is:\n========================\n\n"
                 (describe-function command)
                 "\n\nInvoke with:\n\n"
                 (with-temp-buffer
                   (where-is command t)
                   (buffer-string)))))))

Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  add-text-properties(nil nil (button (t) category help-news-button help-args 
nil) nil)
  make-text-button(nil nil type help-news help-args nil)
  help-fns--first-release(gnus-uu-decode-unshar-and-save-view)
  help-fns--mention-first-release(gnus-uu-decode-unshar-and-save-view)
  run-hook-with-args(help-fns--mention-first-release 
gnus-uu-decode-unshar-and-save-view)
  describe-function-1(gnus-uu-decode-unshar-and-save-view)
  describe-function(gnus-uu-decode-unshar-and-save-view)
  (concat "Your tip for the day is:\n========================\n..." 
(describe-function command) "\n\nInvoke with:\n\n" (let ((temp-buffer 
(generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) 
(unwind-protect (progn (where-is command t) (buffer-string)) (and (buffer-name 
temp-buffer) (kill-buffer temp-buffer))))))
  (princ (concat "Your tip for the day is:\n========================\n..." 
(describe-function command) "\n\nInvoke with:\n\n" (let ((temp-buffer 
(generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) 
(unwind-protect (progn (where-is command t) (buffer-string)) (and (buffer-name 
temp-buffer) (kill-buffer temp-buffer)))))))
  (let* ((commands (let* ((--cl-var-- nil)) (mapatoms #'(lambda (s) (if ... 
...)) nil) (nreverse --cl-var--))) (command (nth (random (length commands)) 
commands))) (princ (concat "Your tip for the day 
is:\n========================\n..." (describe-function command) "\n\nInvoke 
with:\n\n" (let ((temp-buffer (generate-new-buffer " *temp*"))) 
(save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (where-is 
command t) (buffer-string)) (and (buffer-name temp-buffer) (kill-buffer 
temp-buffer))))))))
  (progn (let* ((commands (let* ((--cl-var-- nil)) (mapatoms #'(lambda ... ...) 
nil) (nreverse --cl-var--))) (command (nth (random (length commands)) 
commands))) (princ (concat "Your tip for the day 
is:\n========================\n..." (describe-function command) "\n\nInvoke 
with:\n\n" (let ((temp-buffer (generate-new-buffer " *temp*"))) 
(save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ...) 
(and ... ...))))))))
  (prog1 (progn (let* ((commands (let* ((--cl-var-- nil)) (mapatoms #'... nil) 
(nreverse --cl-var--))) (command (nth (random (length commands)) commands))) 
(princ (concat "Your tip for the day is:\n========================\n..." 
(describe-function command) "\n\nInvoke with:\n\n" (let ((temp-buffer ...)) 
(save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))))))) 
(internal-temp-output-buffer-show buf))
  (let* ((old-dir default-directory) (buf (save-current-buffer (set-buffer 
(get-buffer-create "*Tip of the day*")) (prog1 (current-buffer) 
(kill-all-local-variables) (setq default-directory old-dir) (setq 
buffer-read-only nil) (setq buffer-file-name nil) (setq buffer-undo-list t) 
(let ((inhibit-read-only t) (inhibit-modification-hooks t)) (erase-buffer) 
(run-hooks 'temp-buffer-setup-hook))))) (standard-output buf)) (prog1 (progn 
(let* ((commands (let* (...) (mapatoms ... nil) (nreverse --cl-var--))) 
(command (nth (random ...) commands))) (princ (concat "Your tip for the day 
is:\n========================\n..." (describe-function command) "\n\nInvoke 
with:\n\n" (let (...) (save-current-buffer ... ...)))))) 
(internal-temp-output-buffer-show buf)))
  totd()



In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11, cairo 
version 1.14.8)
 of 2019-06-02 built on silk
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)

Recent messages:
Saving file /home/mah/work/code/emacs/lisp/button.el...
Wrote /home/mah/work/code/emacs/lisp/button.el
Wrote /home/mah/work/code/emacs/lisp/button.elc
Wrote /home/mah/work/code/emacs/lisp/button.{el,elc}
Finding changes in /home/mah/work/code/emacs/lisp/button.el...
QuitInvalid face attribute :family nil
Invalid face attribute :family nil [3 times]
Quit
Connection file "/run/user/1000/emacs/server" deleted
Wrote /home/mah/work/code/emacs/lisp/button.elc

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Features:
(shadow sort bbdb-message mail-extr whitespace cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
vc-annotate vc vc-dispatcher emacsbug sendmail winner helm-command
helm-elisp helm-eval edebug backtrace helm-info helm-mode helm-files
helm-buffers helm-occur helm-tags helm-locate helm-grep helm-regexp
helm-utils helm-types helm-help helm-posframe posframe helm helm-source
helm-multi-match helm-lib compile time-stamp magit-extras magit-gitflow
ivy delsel colir ivy-overlay ffap flycheck elec-pair default cperl-mode
ps-print ps-print-loaddefs ps-def lpr eieio-opt speedbar sb-image
ezimage dframe face-remap spaceline-all-the-icons
spaceline-all-the-icons-separators spaceline-all-the-icons-segments
all-the-icons all-the-icons-faces data-material data-weathericons
data-octicons data-fileicons data-faicons data-alltheicons memoize
spaceline powerline powerline-separators powerline-themes
quelpa-use-package quelpa lisp-mnt help-fns radix-tree gnus-icalendar
org-capture gnus-art mm-uu mml2015 mm-view mml-smime smime dig cus-edit
ispell view cal-china lunar solar cal-dst cal-hebrew cal-julian holidays
hol-loaddefs org-duration org-journal org-crypt cal-iso org-bullets
org-indent org-eww org-rmail org-mhe org-irc org-info org-gnus nnir
org-docview doc-view jka-compr image-mode org-bibtex bibtex org-bbdb
org-w3m poly-org polymode poly-lock polymode-base polymode-weave
polymode-export polymode-compat polymode-methods polymode-core
polymode-classes eieio-custom eieio-base git-auto-commit-mode vc-git
appt alert log4e notifications gntp flx-ido flx yahoo-weather
magit-gerrit magithub magithub-dash magithub-notification magithub-orgs
magithub-issue-tricks magithub-issue-post magithub-edit-mode
magithub-repo magithub-ci magithub-issue magithub-label magithub-user
magithub-core magithub-faces magithub-settings recentf tree-widget
markdown-mode color bug-reference ghub+ apiwrap ghub-graphql treepy
gsexp ghub url-http url-gw nsm url-auth let-alist gnutls s
magit-rockstar magit-tramp docker-tramp tramp-cache tramp tramp-loaddefs
trampver tramp-integration files-x tramp-compat orgit magit-submodule
magit-obsolete magit-popup magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply remember-theme twittering-mode url
url-proxy url-privacy url-expand url-history url-cookie url-domsuf
url-util mailcap tabify xmlunicode quail xmlunicode-missing-list
xmlunicode-character-list php-extras thingatpt company loccur org-mime
ox-org ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util
rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree
generator org-habit org-agenda org-tempo tempo org org-macro
org-footnote org-pcomplete org-list org-faces org-entities org-version
ob-ditaa ob-shell ob-dot ob ob-tangle org-src ob-ref ob-lob ob-table
ob-keys ob-exp ob-comint ob-emacs-lisp ob-core ob-eval org-compat
org-macs org-loaddefs find-func gnus-sum gnus-group gnus-undo gnus-start
gnus-cloud nnimap nnmail mail-source utf7 netrc nnoo parse-time
gnus-spec gnus-int gnus-range gnus-win noutline outline bbdb-mua
bbdb-com bbdb bbdb-site timezone icalendar diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs edmacro kmacro windmove dbus xml time
url-methods use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key use-package-core
whiteboard-theme magit-wip magit-log which-func imenu magit-diff
smerge-mode diff-mode git-commit log-edit message rmc puny dired
dired-loaddefs rfc822 mml mml-sec epa derived epg mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader pcvs-util
add-log magit-core magit-autorevert autorevert filenotify magit-margin
magit-transient magit-process with-editor async-bytecomp async shell
pcomplete comint ring server ansi-color magit-mode transient format-spec
magit-git magit-section magit-utils crm ido help-at-pt gnus nnheader
gnus-util rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums
text-property-search time-date mail-utils mm-util mail-prsvr wid-edit
emojify advice apropos tar-mode arc-mode archive-mode ht direnv dash
auto-compile easy-mmode packed pcase allout cus-load finder-inf
mule-util debian-el gh-common marshal eieio-compat rx cl-extra help-mode
org2blog-autoloads cl info package easymenu epg-config 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 tooltip cus-start 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 menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame 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 minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting xwidget-internal cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1940480 240665)
 (symbols 48 71107 7)
 (strings 32 494718 23323)
 (string-bytes 1 20345025)
 (vectors 16 120321)
 (vector-slots 8 4014965 165996)
 (floats 8 2199 1055)
 (intervals 56 28688 10399)
 (buffers 992 61))



-- 
http://hexmode.com/

Whoever closes his ear to the cry of the poor will himself call out
and not be answered.  — Proverbs 21:13