bug#16274: Can still reproduce in Emacs 24.5.2/x86_64-unknown-linux-gnu

["Michael Hoffman" <fklv2wf02@sneakemail.com>]

I can reproduce this with Emacs 24.5.2 on Linux using the instructions found in <http://lists.gnu.org/archive/html/bug-gnu-emacs/2015-01/msg00995.html>. Specifically:

1. emacs -Q
2. M-x icomplete-mode
3. M-x set-variable icomplete-show-matches-on-no-input t
4. C-x C-f C-a C-k

I have now set `icomplete-show-matches-on-no-input` to `nil` and have not triggered the bug again.

In GNU Emacs 24.5.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.8)
 of 2015-07-29 on mhoffman2.uhnres.utoronto.ca
Windowing system distributor `The X.Org Foundation', version 11.0.11500000
System Description:	CentOS Linux release 7.1.1503 (Core) 

Configured using:
 `configure --prefix=/users/mhoffman
 --exec-prefix=/users/mhoffman/arch/Linux-x86_64 'CFLAGS=-O2
 -march=native -pipe -fomit-frame-pointer' LDFLAGS=-Wl,-O1'

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

Major mode: Lisp Interaction

Minor modes in effect:
  icomplete-mode: t
  tooltip-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:
For information about GNU Emacs and the GNU system, type C-h C-a.
Icomplete mode enabled
Error in post-command-hook (icomplete-post-command-hook): (invalid-function (#("./" 0 1 (face (completions-first-difference))) #("../" 0 1 (face (completions-first-difference)))))
Quit

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message 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 cus-edit easymenu wid-edit cl-loaddefs cl-lib
help-fns mule-util cus-start cus-load icomplete time-date tooltip
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer 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 make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 90594 3758)
 (symbols 48 19313 0)
 (miscs 40 36 124)
 (strings 32 13452 4435)
 (string-bytes 1 370253)
 (vectors 16 10101)
 (vector-slots 8 392565 9391)
 (floats 8 71 91)
 (intervals 56 176 1)
 (buffers 960 11)
 (heap 1024 20881 916))