Bug: (forward-comments -1) gets confused by insignificant comment delimiters.

Alan Mackenzie acm at muc.de
Wed Aug 9 15:27:16 EDT 2006 

To: XEmacs Beta <xemacs-beta at xemacs.org>
Subject: [Bug: 21.4.17] (forward-comment -1) gets confused by non-significant slashes
--text follows this line--
================================================================
Dear Stephen, dear Bug Team!

Create a new file in C++ mode with the following contents:
(Note: the hashes are not part of the file, neither are the line numbers.)

#########################################################################
1
2    ///
3
4
5   /*  //   */
6
#########################################################################

1. With point at BOL3, do M-: (forward-comment -1).  Point ends up AFTER
the first / on L2.  It should end up BEFORE that first slash.

2. With point at BOL6, do M-: (forward-comment -1).  Point wrongly ends
up at "//" on L5 instead of at the "/*".

I found this bug whilst tracking down an indentation problem reported by
a CC Mode user.

[PS: I owe you a new release of CC Mode, and have done for an
embarrassingly long time.  Sorry about that.  However, as a consolation,
there were a lot of bugs in the earlier CC Mode 5.31.n releases which
XEmacs users will avoid ever seeing.  I'm hoping to release 5.31.4 within
the next ~8 weeks - getting it into XEmacs will be high priority this
time.]

================================================================

System Info to help track down your bug:
---------------------------------------

uname -a: Linux penell 2.6.10 #1 Fri Feb 4 22:08:22 JST 2005 i686 GNU/Linux

./configure  '--with-sound=none,native' '--with-x11' '--extra-verbose' '--with-site-lisp' '--with-database=berkdb' '--statedir=/var/lib' '--infodir=/usr/share/info/xemacs-21.4.17' '--prefix=/usr' '--dynamic' '--error-checking=none' '--debug=no' '--with-pop' '--with-gpm=no' '--with-file-coding' '--pdump' '--with_menubars=lucid' '--with_scrollbars=lucid' '--with_dialogs=athena' '--docdir=/usr/lib/xemacs-21.4.17/i386-debian-linux/mule/' '--with-mule' '--with-canna=no' '--with-wnn=no' '--with-xim=xlib' '--with-xfs' '--package-path=~/.xemacs:~/.xemacs/packages:~/.xemacs/xemacs-packages::/usr/share/xemacs21/xemacs-packages:/usr/share/xemacs21/mule-packages:/usr/share/xemacs21/site-packages' 'i386-debian-linux'


XEmacs 21.4.17 "Jumbo Shrimp" configured for `i386-debian-linux'.


Compilation / Installation:
  Source code location:              /home/mohura/packages/build-area/xemacs21-21.4.17
  Installation prefix:               /usr
  Operating system description file: `s/linux.h'
  Machine description file:          `m/intel386.h'
  Compiler:                          gcc -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -fno-strict-aliasing -Wshadow
  Compiler version:                  gcc (GCC) 3.3.5 (Debian 1:3.3.5-8)
  Compiler specs file:               /usr/lib/gcc-lib/i486-linux/3.3.5/specs
  Relocating allocator for buffers:  no
  GNU version of malloc:             yes
    - Using Doug Lea's new malloc from the GNU C Library.
Need to guess glibc1/2/etc here

Window System:
  Compiling in support for the X window system:
    - X Windows headers location:                 /usr/X11R6/include
    - X Windows libraries location:               /usr/X11R6/lib
    - Handling WM_COMMAND properly.
  Compiling in support for the Athena widget set:
    - Athena headers location:                    X11/Xaw
    - Athena library to link:                     Xaw
  Using Lucid menubars.
  Using Lucid scrollbars.
  Using Athena dialog boxes.
  Using Athena native widgets.

TTY:
  Compiling in support for ncurses.

Images:
  Compiling in support for GIF  images (builtin).
  Compiling in support for XPM  images.
  Compiling in support for PNG  images.
  Compiling in support for JPEG images.
  Compiling in support for TIFF images.
  Compiling in support for X-Face message headers.

Sound:
  Compiling in support for sound (native).

Databases:
  Compiling in support for Berkeley database.
  Compiling in support for LDAP.

Internationalization:
  Compiling in support for Mule (multi-lingual Emacs).
  Compiling in support for file coding.
  Compiling in support for XIM (X11R5+ I18N input method).
    - Using raw Xlib to provide XIM support.
    - Using XFontSet to provide bilingual menubar.

Mail:
  Compiling in support for POP mail retrieval.
  Compiling in support for "dot-locking" mail spool file locking method.

Other Features:
  Inhibiting IPv6 canonicalization at startup.
  Compiling in support for dynamic shared object modules.
  Using the new portable dumper.



Load-Path Lisp Shadows:
----------------------
(/usr/share/xemacs21/site-lisp/a2ps/a2ps-print
/usr/share/xemacs21/site-lisp/a2ps/a2ps-print
/usr/share/xemacs21/site-lisp/a2ps/a2ps
/usr/share/xemacs21/site-lisp/a2ps/a2ps
/usr/share/xemacs21/site-lisp/dictionaries-common/ispell
/usr/share/xemacs21/site-lisp/dictionaries-common/ispell
/usr/share/xemacs21/site-lisp/dictionaries-common/debian-ispell
/usr/share/xemacs21/site-lisp/dictionaries-common/debian-ispell
/usr/share/xemacs21/site-lisp/debian-startup
/usr/share/emacs/site-lisp/debian-startup ~acm/cc-mode-5.31.xemacs/cc-vars
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-vars
~acm/cc-mode-5.31.xemacs/cc-styles
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-styles
~acm/cc-mode-5.31.xemacs/cc-mode
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-mode
~acm/cc-mode-5.31.xemacs/cc-menus
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-menus
~acm/cc-mode-5.31.xemacs/cc-lobotomy
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-lobotomy
~acm/cc-mode-5.31.xemacs/cc-langs
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-langs
~acm/cc-mode-5.31.xemacs/cc-guess
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-guess
~acm/cc-mode-5.31.xemacs/cc-fix
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-fix
~acm/cc-mode-5.31.xemacs/cc-fonts
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-fonts
~acm/cc-mode-5.31.xemacs/cc-defs
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-defs
~acm/cc-mode-5.31.xemacs/cc-engine
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-engine
~acm/cc-mode-5.31.xemacs/cc-cmds
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-cmds
~acm/cc-mode-5.31.xemacs/cc-compat
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-compat
~acm/cc-mode-5.31.xemacs/cc-awk
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-awk
~acm/cc-mode-5.31.xemacs/cc-bytecomp
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-bytecomp
~acm/cc-mode-5.31.xemacs/cc-align
/usr/share/xemacs21/xemacs-packages/lisp/cc-mode/cc-align
/usr/share/xemacs21/site-lisp/dictionaries-common/ispell
/usr/share/xemacs21/xemacs-packages/lisp/ispell/ispell
/usr/share/xemacs21/xemacs-packages/lisp/build/build-report
/usr/lib/xemacs-21.4.17/lisp/build-report)


Installed XEmacs Packages:
-------------------------
(skk ver: 1.23 upstream: 10.62a)
(mule-ucs ver: 1.11 upstream: 0.84)
(mule-base ver: 1.46 upstream: No-Upstream-Ver)
(lookup ver: 1.14 upstream: 1.0)
(locale ver: 1.22 upstream: No-Upstream-Ver)
(leim ver: 1.22 upstream: No-Upstream-Ver)
(latin-unity ver: 1.14 upstream: 1.14)
(latin-euro-standards ver: 1.0 upstream: 1.0)
(egg-its ver: 1.27 upstream: No-Upstream-Ver)
(edict ver: 1.16 upstream: 0.9.9)
(zenirc ver: 1.15 upstream: 2.112)
(xwem ver: 1.19 upstream: lg at xwem.org--2004/xwem--main--2.0--version-0)
(xslt-process ver: 1.11 upstream: 1.2.1)
(xslide ver: 1.09 upstream: 0.2.2)
(xlib ver: 1.13 upstream: lg at xwem.org--2004/xlib--main--2.0--version-0)
(xemacs-devel ver: 1.7 upstream: No-Upstream-Ver)
(xemacs-base ver: 1.96 upstream: No-Upstream-Ver)
(x-symbol ver: 1.1 upstream: 4.5.1)
(w3 ver: 1.3 upstream: 4.0pre47)
(vm ver: 7.18 upstream: 7.17)
(viper ver: 1.38 upstream: 3.09)
(view-process ver: 1.13 upstream: 2.4)
(vhdl ver: 1.2 upstream: 3.33.2)
(vc-cc ver: 1.22 upstream: No-Upstream-Ver)
(vc ver: 1.4 upstream: No-Upstream-Ver)
(tramp ver: 1.22 upstream: 2.0.47)
(tpu ver: 1.14 upstream: 4.2X)
(tooltalk ver: 1.15 upstream: No-Upstream-Ver)
(tm ver: 1.37 upstream: No-Upstream-Ver)
(time ver: 1.14 upstream: 1.17)
(textools ver: 1.15 upstream: No-Upstream-Ver)
(text-modes ver: 1.84 upstream: No-Upstream-Ver)
(texinfo ver: 1.28 upstream: No-Upstream-Ver)
(supercite ver: 1.2 upstream: 3.55x3)
(strokes ver: 1.1 upstream: No-Upstream-Ver)
(speedbar ver: 1.27 upstream: 0.14beta4)
(sounds-wav ver: 1.12 upstream: No-Upstream-Ver)
(sounds-au ver: 1.12 upstream: No-Upstream-Ver)
(sml-mode ver: 0.11 upstream: 3.9.5)
(slider ver: 1.15 upstream: 0.3x1)
(sieve ver: 1.17 upstream: No-Upstream-Ver)
(sh-script ver: 1.18 upstream: 2.0e)
(sgml ver: 1.11 upstream: No-Upstream-Ver)
(semantic ver: 1.19 upstream: 1.4.2)
(scheme ver: 1.14 upstream: No-Upstream-Ver)
(sasl ver: 1.15 upstream: 1.14.4)
(ruby-modes ver: 1.02 upstream: 1.6.8)
(rmail ver: 1.14 upstream: No-Upstream-Ver)
(riece ver: 1.17 upstream: 1.0.6)
(reftex ver: 1.34 upstream: 4.21)
(python-modes ver: 1.06 upstream: No-Upstream-Ver)
(psgml-dtds ver: 1.03 upstream: No-Upstream-Ver)
(psgml ver: 1.43 upstream: 1.3.1)
(ps-print ver: 1.11 upstream: 6.5.6)
(prog-modes ver: 2.02 upstream: No-Upstream-Ver)
(pgg ver: 1.05 upstream: 0.1)
(perl-modes ver: 1.07 upstream: No-Upstream-Ver)
(pcomplete ver: 1.04 upstream: 1.1.6)
(pcl-cvs ver: 1.66 upstream: R-2_9_9)
(pc ver: 1.27 upstream: No-Upstream-Ver)
(os-utils ver: 1.36 upstream: No-Upstream-Ver)
(oo-browser ver: 1.04 upstream: 4.08)
(ocaml ver: 0.05 upstream: 3.06)
(net-utils ver: 1.44 upstream: N/A)
(mmm-mode ver: 1.02 upstream: 0.4.7)
(misc-games ver: 1.18 upstream: No-Upstream-Ver)
(mine ver: 1.16 upstream: 1.9)
(mh-e ver: 1.28 upstream: 7.4.2)
(mew ver: 1.18 upstream: 1.94.2)
(mailcrypt ver: 2.14 upstream: 3.5.8)
(mail-lib ver: 1.71 upstream: No-Upstream-Ver)
(liece ver: 1.13 upstream: 1.4.9)
(jde ver: 1.46 upstream: 2.3.2)
(ispell ver: 1.31 upstream: 3.6)
(ilisp ver: 1.33 upstream: 5.12.0)
(igrep ver: 1.13 upstream: 2.111)
(idlwave ver: 1.31 upstream: 5.1)
(ibuffer ver: 1.09 upstream: No-Upstream-Ver)
(hyperbole ver: 1.16 upstream: 4.18)
(hm--html-menus ver: 1.23 upstream: 5.9)
(haskell-mode ver: 1.07 upstream: 1.45)
(gnus ver: 1.82 upstream: 5.10.6)
(gnats ver: 1.16 upstream: 3.101)
(general-docs ver: 1.03 upstream: No-Upstream-Ver)
(games ver: 1.15 upstream: 1.04)
(fsf-compat ver: 1.15 upstream: No-Upstream-Ver)
(frame-icon ver: 1.11 upstream: No-Upstream-Ver)
(fortran-modes ver: 1.04 upstream: No-Upstream-Ver)
(forms ver: 1.15 upstream: 2.37)
(footnote ver: 1.16 upstream: 0.18x)
(eudc ver: 1.39 upstream: 1.32)
(eterm ver: 1.15 upstream: No-Upstream-Ver)
(ess ver: 1.12 upstream: 5.2.3)
(eshell ver: 1.08 upstream: 2.4.1)
(escreen ver: 1.01 upstream: 1.16)
(erc ver: 0.12 upstream: Version 4.0 Revision: 1.675)
(emerge ver: 1.11 upstream: No-Upstream-Ver)
(elib ver: 1.11 upstream: 1.0)
(eieio ver: 1.05 upstream: 0.17)
(efs ver: 1.33 upstream: 1.23)
(edt ver: 1.13 upstream: No-Upstream-Ver)
(edit-utils ver: 2.22 upstream: No-Upstream-Ver)
(ediff ver: 1.51 upstream: 2.75)
(edebug ver: 1.21 upstream: No-Upstream-Ver)
(ecrypto ver: 0.19 upstream: 2.0)
(ecb ver: 1.22 upstream: 2.31)
(docbookide ver: 0.07000000000000001 upstream: 0.1)
(dired ver: 1.16 upstream: 7.12)
(dictionary ver: 1.15 upstream: 1.8)
(debug ver: 1.17 upstream: No-Upstream-Ver)
(crisp ver: 1.14 upstream: 1.34)
(cookie ver: 1.15 upstream: No-Upstream-Ver)
(clearcase ver: 1.09 upstream: /main/laptop/156)
(cc-mode ver: 1.43 upstream: 5.30.9)
(calendar ver: 1.23 upstream: No-Upstream-Ver)
(calc ver: 1.26 upstream: 2.02fX3)
(c-support ver: 1.2 upstream: No-Upstream-Ver)
(build ver: 1.14 upstream: 2.02)
(bbdb ver: 1.25 upstream: 2.34)
(auctex ver: 1.46 upstream: 11.55)
(apel ver: 1.27 upstream: 10.2)
(ada ver: 1.14 upstream: 2.27)
(Sun ver: 1.16 upstream: No-Upstream-Ver)



Installed Modules:
-----------------


Features:
--------

(mail-abbrevs xemacsbug shadow sendmail rfc822 info view-less view
hyper-apropos cl-specs edebug cc-mode cc-fonts cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs regexp-opt paren blink-paren efs-cu desktop
font-lock cus-face kn-prefix mwheel skk-autoloads mule-ucs-autoloads
mule-base-autoloads lookup-autoloads locale-autoloads leim-autoloads
latin-unity-autoloads latin-euro-standards-autoloads egg-its-autoloads
edict-autoloads zenirc-autoloads xwem-autoloads xslt-process-autoloads
xslide-autoloads xlib-autoloads xemacs-devel-autoloads xemacs-base-autoloads
x-symbol-autoloads w3-autoloads vm-autoloads viper-autoloads
view-process-autoloads vhdl-autoloads vc-cc-autoloads vc-autoloads
tramp-autoloads tpu-autoloads tooltalk-autoloads tm-autoloads time-autoloads
textools-autoloads text-modes-autoloads texinfo-autoloads supercite-autoloads
strokes-autoloads speedbar-autoloads sounds-wav-autoloads sounds-au-autoloads
sml-mode-autoloads slider-autoloads sieve-autoloads sh-script-autoloads
sgml-autoloads semantic-autoloads scheme-autoloads sasl-autoloads
ruby-modes-autoloads rmail-autoloads riece-autoloads reftex-autoloads
python-modes-autoloads psgml-dtds-autoloads psgml-autoloads ps-print-autoloads
prog-modes-autoloads pgg-autoloads perl-modes-autoloads pcomplete-autoloads
pcl-cvs-autoloads pc-autoloads os-utils-autoloads oo-browser-autoloads
ocaml-autoloads net-utils-autoloads mmm-mode-autoloads misc-games-autoloads
mine-autoloads mh-e-autoloads mew-autoloads mailcrypt-autoloads
mail-lib-autoloads liece-autoloads jde-autoloads ispell-autoloads
ilisp-autoloads igrep-autoloads idlwave-autoloads ibuffer-autoloads
hyperbole-autoloads hm--html-menus-autoloads haskell-mode-autoloads
gnus-autoloads gnats-autoloads general-docs-autoloads games-autoloads
fsf-compat-autoloads frame-icon-autoloads fortran-modes-autoloads
forms-autoloads footnote-autoloads eudc-autoloads eterm-autoloads
ess-autoloads eshell-autoloads escreen-autoloads erc-autoloads
emerge-autoloads elib-autoloads eieio-autoloads efs-autoloads edt-autoloads
edit-utils-autoloads ediff-autoloads edebug-autoloads ecrypto-autoloads
ecb-autoloads docbookide-autoloads dired-autoloads dictionary-autoloads
debug-autoloads crisp-autoloads cookie-autoloads clearcase-autoloads
cc-mode-autoloads calendar-autoloads calc-autoloads c-support-autoloads
build-autoloads bbdb-autoloads auctex-autoloads apel-autoloads ada-autoloads
Sun-autoloads lisp-autoloads loadhist auto-show fontl-hooks x-iso8859-1
slovenian czech romanian ccl mule-help code-cmds gutter-items menubar-items
x-menubar mode-motion mouse itimer auto-save lisp-mode easymenu iso8859-1 page
buff-menu lib-complete cus-file derived frame text-props obsolete cus-start
custom widget cl-extra mini-cl cl cl-19 packages backquote very-early-lisp
file-coding mule lucid-scrollbars cut-buffer lucid-menubars athena-dialogs x
c-balloon-help tty-frames tty toolbar native-sound scrollbar unix-processes
multicast network-streams subprocesses modules menu-accelerator-support
menubar berkeley-db md5 xemacs xim gutter tiff png gif jpeg xface xpm xbm
lisp-float-type linux dialog devices window-system base64)


Recent keystrokes:
-----------------

[ removed due to irrelevance. ]

Recent messages (most recent first):
-----------------------------------

[ removed due to irrelevance. ]

-- 
Alan Mackenzie (Munich, Germany)

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