Subject: 25.0.50; Can't customize whitespace-display-mappings

From: Ivan Andrus <[email-masked]>
Date: Tue, 27 Oct 2015 14:58:30 -0600

This might be related to bug #2689,
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2689

;; emacs -Q
;; Evaluated
(require 'whitespace)
(customize-variable 'whitespace-display-mappings)
;; Change anything, say deleting one of space mappings
;; Try to save
;; Get the error
custom-variable-set: This field should contain a single character

-Ivan

In GNU Emacs 25.0.50.6 (x86_64-apple-darwin14.5.0, NS appkit-1348.17
Version 10.10.5 (Build 14F27))
of 2015-10-21
Repository revision: ecba9093844fb32756923e3124f6c1dbc0dc7a79
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --with-ns PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig --with-xpm'

Configured features:
JPEG RSVG IMAGEMAGICK DBUS ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Resetting customization items...done
Creating customization setup...done
You can run the command ‘customize-variable’ with M-x c-var RET
Creating customization setup...done
custom-variable-set: This field should contain a single character [2 times]
Mark set [2 times]
kill-region: Buffer is read-only: #<buffer *Messages*>
Mark set
<C-s-268632064> is undefined
Undo! [2 times]

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message dired format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils filecache whitespace help-fns help-mode
cus-edit easymenu cus-start cus-load wid-edit cl-loaddefs pcase cl-lib
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel ns-win term/common-win 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 cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 106811 7389)
(symbols 48 20947 0)
(miscs 40 721 530)
(strings 32 17666 4716)
(string-bytes 1 492986)
(vectors 16 11943)
(vector-slots 8 424806 7171)
(floats 8 141 392)
(intervals 56 780 11)
(buffers 976 14))