bug#64104: Subject: 30.0.50; uncomment-region-default-1

[Andreas Röhler]

Hi,

C-u comment-dwim RET with an active region of the following Python code:

---
# for i in text:
#     print("(i): {}".format(str(i)))
---

results in error saying

uncomment-region-default-1: Beginning of buffer

AFAIU the culprit is in newcomment.el, line 933:

(numarg (prefix-numeric-value arg))

and later in line 978

it tries

(delete-char (- numarg))

which at the beginning of buffer causes that error.

comment-dwin says:

if a prefix ARG is specified, call ‘comment-kill’

which is my intended use-case.

Thanks,

Andreas Röhler

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2023-06-16 built on kanu
Repository revision: f2aae8b879baa4986b69af7ee54fe4eb987b99d6
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.2 LTS

Configured using:
 'configure --with-tree-sitter --with-modules --with-mailutils'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE
XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
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  global-eldoc-mode: t
  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
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny rfc822
mml mml-sec password-cache epa derived epg rfc6068 epg-config gnus-util
text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils vc-git diff-mode easy-mmode vc-dispatcher
python json map rx project byte-opt gv bytecomp byte-compile pcase
treesit cl-seq comint ansi-osc ring ansi-color dired-aux dired
dired-loaddefs time-date subr-x wheatgrass-theme cus-theme cus-edit pp
cus-start cus-load icons wid-edit cl-loaddefs cl-lib rmc iso-transl
tooltip cconv 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
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simple cl-generic indonesian philippine cham georgian utf-8-lang
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custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 135452 11240)
 (symbols 48 20124 0)
 (strings 32 48692 1931)
 (string-bytes 1 1037720)
 (vectors 16 17224)
 (vector-slots 8 230171 13481)
 (floats 8 39 46)
 (intervals 56 1109 13)
 (buffers 984 15))