bug#1742: 23.0.60; ediff-skip-merge-regions-that-differ-from-default breaks simple ediffs

[David Abrahams <dave@boostpro.com>]

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Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

0. Extract the enclosed files to /tmp

1. Evaluate:

  (custom-set-variables
   '(ediff-skip-merge-regions-that-differ-from-default t)
  )
  (ediff "/tmp/x" "/tmp/y")
  
2. Hit the spacebar

Result: "You have killed a vital Ediff buffer---you must leave Ediff
now!"

This happens even with "emacs -q"

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, GTK+ Version 2.14.4)
 of 2008-12-12 on mcbain
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
configured using `configure  '--with-x-toolkit=gtk' '--prefix=/usr/local''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Custom

Minor modes in effect:
  diff-auto-refine-mode: t
  show-paren-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-p R x <return> C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p R y <return> M-x e d i f f <return> x <return> 
y <return> SPC q y y y M-x e d i f f - b u f <tab> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <tab> u <tab> C-g C-g C-x b e d i <tab> 
<return> M-< C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-x 
C-f e d <tab> i <tab> . <tab> <return> C-s b u f <backspace> 
g C-s C-s C-p C-p C-p C-p C-n C-n C-n C-n C-n C-p C-p 
C-p C-p C-. C-. C-. C-. C-. C-. C-. C-n C-n C-n C-n 
C-n C-n C-n C-n C-x C-k C-x C-k <help-echo> <down-mouse-1> 
<mouse-1> C-x C-p <return> M-> M-< C-x C-k <down-mouse-1> 
<mouse-1> M-x c u s t o m <tab> - a p <tab> <return> 
e d i f f <return> C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-s m e r g e SPC 
p r e M-< C-s p r e f i x C-n C-p C-n C-a C-. C-b C-s 
s k i p C-e C-, C-, C-, C-, <return> C-n C-, C-, C-a 
C-, C-a C-n C-f C-f C-f C-f C-f C-f C-f <return> 0 
M-x M-p M-p <return> x <return> y <return> SPC SPC 
SPC p p p q y y y C-p C-e C-, C-, C-, M-x r e p o r 
t - e m a <tab> b u <tab> <return>

Recent messages:
Computing differences between x and y ...
Buffer A: Processing difference region 0 of 2
Buffer B: Processing difference region 0 of 2
Processing difference regions ... done
Region 1 in buffer A is empty [2 times]
Region 2 in buffer A is empty [4 times]
Region 1 in buffer A is empty [2 times]
Quit this Ediff session? (y or n) 
Kill buffer A [x]? (y or n) 
Kill buffer B [y]? (y or n) 


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checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking whether to enable maintainer-specific portions of Makefiles... no
checking for gcc... gcc
checking for gcc... (cached) gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking dependency style of gcc... (cached) gcc3
checking for ranlib... ranlib
checking whether optimization for size works... yes
checking whether gcc has -fno-stack-protector... yes
checking whether -Wundef works... yes
checking whether -falign-loops works... yes
checking for objcopy... objcopy
checking if C symbols get an underscore after compilation... no
checking whether objcopy works for absolute addresses... yes
checking whether addr32 must be in the same line as the instruction... yes
checking for .code16 addr32 assembler support... yes
checking whether an absolute indirect call/jump must not be prefixed with an asterisk... no
checking if start is defined by the compiler... no
checking if _start is defined by the compiler... yes
checking if __bss_start is defined by the compiler... yes
checking if _edata is defined by the compiler... yes
checking if edata is defined by the compiler... yes
checking if end is defined by the compiler... yes
checking if _end is defined by the compiler... yes
checking for opendisk in -lutil... no
checking for wgetch in -lncurses... yes
checking how to run the C preprocessor... gcc -E
checking for egrep... grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for string.h... (cached) yes
checking for strings.h... (cached) yes
checking ncurses/curses.h usability... no
checking ncurses/curses.h presence... no
checking for ncurses/curses.h... no
checking ncurses.h usability... yes
checking ncurses.h presence... yes
checking for ncurses.h... yes
checking curses.h usability... yes
checking curses.h presence... yes
checking for curses.h... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating stage1/Makefile
config.status: creating stage2/Makefile
config.status: creating docs/Makefile
config.status: creating lib/Makefile
config.status: creating util/Makefile
config.status: creating grub/Makefile
config.status: creating netboot/Makefile
config.status: creating util/grub-image
config.status: creating util/grub-install
config.status: creating util/grub-md5-crypt
config.status: creating util/grub-terminfo
config.status: creating util/grub-set-default
config.status: creating config.h
config.status: executing depfiles commands

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checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking whether to enable maintainer-specific portions of Makefiles... no
checking for gcc... gcc
checking for gcc... (cached) gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking dependency style of gcc... (cached) gcc3
checking for ranlib... ranlib
checking whether optimization for size works... yes
checking whether gcc has -fno-stack-protector... yes
checking whether -Wundef works... yes
checking whether -falign-loops works... yes
checking for objcopy... objcopy
checking if C symbols get an underscore after compilation... no
checking whether objcopy works for absolute addresses... yes
checking whether addr32 must be in the same line as the instruction... yes
checking for .code16 addr32 assembler support... yes
checking whether an absolute indirect call/jump must not be prefixed with an asterisk... no
checking if start is defined by the compiler... no
checking if _start is defined by the compiler... yes
checking if __bss_start is defined by the compiler... yes
checking if _edata is defined by the compiler... yes
checking if edata is defined by the compiler... yes
checking if end is defined by the compiler... yes
checking if _end is defined by the compiler... yes
checking for opendisk in -lutil... no
checking for wgetch in -lncurses... yes
checking how to run the C preprocessor... gcc -E
checking for egrep... grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for string.h... (cached) yes
checking for strings.h... (cached) yes
checking ncurses/curses.h usability... no
checking ncurses/curses.h presence... no
checking for ncurses/curses.h... no
checking ncurses.h usability... yes
checking ncurses.h presence... yes
checking for ncurses.h... yes
checking curses.h usability... yes
checking curses.h presence... yes
checking for curses.h... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating stage1/Makefile
config.status: creating stage2/Makefile
config.status: creating docs/Makefile
config.status: creating lib/Makefile
config.status: creating util/Makefile
config.status: creating grub/Makefile
config.status: creating netboot/Makefile
config.status: creating util/grub-image
config.status: creating util/grub-install
config.status: creating util/grub-md5-crypt
config.status: creating util/grub-terminfo
config.status: creating util/grub-set-default
config.status: creating config.h
config.status: config.h is unchanged
config.status: executing depfiles commands
make  all-recursive
make[1]: Entering directory `/tmp/grub-build'
Making all in netboot
make[2]: Entering directory `/tmp/grub-build/netboot'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/tmp/grub-build/netboot'
Making all in stage2
make[2]: Entering directory `/tmp/grub-build/stage2'
Makefile:3544: *** missing separator.  Stop.
make[2]: Leaving directory `/tmp/grub-build/stage2'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/grub-build'
make: *** [all] Error 2

Compilation exited abnormally with code 2 at Tue Dec 30 05:51:37

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-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com