bug#26276: 25.1; diff with DIRED error

[Live System User]

Hi,

        When using diff with dired I am getting an error:

0. emacs -Q &

1. C-x d RET

2. m (dired-mark)
   mark two files, file.txt file.txt~

3. C-p C-p (dired-previous-line)
   move to line with file.txt

4. Click Immediate->diff

5. Click Open for file.txt~


   I then get the following *Diff* buffer with errors:

diff -u /home/liveuser/file.txt\~ /home/liveuser/file.txt
--- /home/liveuser/file.txt~    2017-03-15 08:23:58.796074954 -0400
+++ /home/liveuser/file.txt     2017-03-15 08:29:17.400387624 -0400
@@ -1,3 +1,5 @@
+When describe-symbol C-h o
+
 Debugger entered--Lisp error: (wrong-number-of-arguments nil 1)
   signal(wrong-number-of-arguments (nil 1))
   (if (= (length --cl-rest--) 2) (car-safe (prog1 --cl-rest-- (setq 
--cl-rest-- (cdr --cl-rest--)))) (signal (quote wrong-number-of-arguments) 
(list nil (length --cl-rest--))))

Diff finished.  Mon Mar 27 17:14:10 2017


[Aside;  Why are the diff files reversed?

         Why isn't the diff command:

diff -u /home/liveuser/file.txt /home/liveuser/file.txt\~

         Is there any way to get "diff -u file.txt file.txt~",
         i.e. the file that is clicked on (step 5 above) is
         the second file, not the first in the diff -u command?]


         Thanks.




In GNU Emacs 25.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.9)
 of 2016-10-13 built on buildvm-05.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11803000
Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
 -m64 -mtune=generic' LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

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

Major mode: Summary

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-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
  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 messages:
nnimap read 105k from imap.aim.com
nnimap read 113k from imap.aim.com
nnimap read 121k from imap.aim.com [2 times]
nnimap read 136k from imap.aim.com
nnimap read 140k from imap.aim.com
Fetching headers for nnimap+aol:INBOX...done
Scoring...done
Sorting threads...done
Generating summary...done
Making completion list...

Load-path shadows:
None found.

Features:
(shadow emacsbug sendmail sort gnus-cite smiley ansi-color mail-extr
gnus-async gnus-bcklg qp gnus-ml disp-table cursor-sensor nndraft nnmh
mm-archive jka-compr timezone url-http url-gw url-cache url-auth
url-handlers utf-7 rfc2104 nnfolder nnagent nnml network-stream nsm
starttls gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg
nntp gnus-cache epa-file epa derived nnreddit mm-url url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util url-parse auth-source cl-seq eieio eieio-core cl-macs url-vars
json map seq byte-opt bytecomp byte-compile cl-extra cconv gnus-art
mm-uu mml2015 mm-view mml-smime smime dig mailcap cl gv sieve sieve-mode
sieve-manage nnir gnus-sum gnus-group gnus-undo gnus-start gnus-cloud
nnimap nnmail mail-source tls gnutls utf7 netrc parse-time gnus-spec
gnus-int gnus-range message dired format-spec rfc822 mml mml-sec
password-cache epg epg-config mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils mailheader
gnus-win gnus gnus-ems wid-edit nnoo nnheader gnus-util mm-util help-fns
help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr mail-utils
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core 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 charscript case-table epa-hook
jka-cmpr-hook help simple abbrev 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 dbusbind inotify dynamic-setting
system-font-setting font-render-setting xwidget-internal move-toolbar
gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 243113 27895)
 (symbols 48 31249 0)
 (miscs 40 207 253)
 (strings 32 57205 6469)
 (string-bytes 1 1837285)
 (vectors 16 26144)
 (vector-slots 8 852915 64994)
 (floats 8 404 563)
 (intervals 56 4405 63)
 (buffers 976 42)
 (heap 1024 73696 12813))