bug#18012: 24.3; Can't print a huge list structure in IELM

[address@hidden]

I have a function that creates a nested list in the form (x (x (x (x
(...))))) arbitrarily deep:

(defun nestify (xs)
  (cl-reduce (lambda (x y) (if y (list x y) (list x))) xs :from-end t
  :initial-value nil))

In IELM when I try to call it on a sufficiently big list, it crashes
with an error:

ELISP> (nestify (number-sequence 1 1000))
*** IELM Error ***  Error during pretty-printing (bug in pp)

Googling the above error, including on Debbugs.gnu.org and site-only
search on gnu.org haven't revealed anything. zrgrep-ing showed the
string "Error during pretty-printing" is in function `ielm-eval-input`
in file `ielm.el`. Thus, I report this bug.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.4)
 of 2013-09-27 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11403000
System Description:     LMDE Cinnamon Edition

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  shell-dirtrack-mode: t
  icomplete-mode: t
  global-hl-line-mode: t
  show-paren-mode: t
  ido-everywhere: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  delete-selection-mode: t
  recentf-mode: t
  ergoemacs-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent input:
q SPC z z z SPC " a r s t " ) <return> ( p r i n c 
SPC z z z z <backspace> ) <return> <C-up> M-h ( p r 
i n c SPC M-H ) <return> <C-up> M-h ( p r i n c SPC 
M-H ) <return> ( s e t q SPC z z z <backspace> <backspace> 
<backspace> y y y SPC " a r s t " ) <return> ( s e 
t q SPC z z z z <backspace> SPC y y y ) <return> <C-up> 
M-l ' <return> ( p r i n c SPC z z z ) <return> <C-up> 
M-h M-y M-s M-r u d m e l i s p <return> M-r <f1> f 
f u n c a l l <return> M-r q <help-echo> <help-echo> 
<down-mouse-1> <mouse-2> <down-mouse-1> <mouse-1> SPC 
SPC SPC SPC SPC SPC SPC M-r i n t e r n M-h C-M-SPC 
<backspace> ( i n e r <backspace> <backspace> t e r 
n SPC 1 ) <return> <C-up> M-n <backspace> " a r s t 
" <return> <C-up> M-h M-H M-n M-s <backspace> y y y 
M-H <return> <C-up> M-h ( <backspace> ( M-H ) <return> 
<C-up> M-h M-y M-h M-i f u n c a l l SPC M-H <return> 
<down-mouse-1> <mouse-1> <next> <next> <next> SPC SPC 
M-r ( g e t SPC y y y ) <return> <C-up> M-n SPC y y 
y <return> M-r SPC SPC SPC SPC SPC SPC u u M-u M-u 
M-u M-u M-u M-u M-u M-u M-u M-u M-u M-u M-u <return> 
d m e l i s p <return> M-E M-a e m a c s - r e p <tab> 
M-SPC M-h <backspace> r e p o r t - e m <tab> <ret
urn>

Recent messages:
History item: 1
arstarst
History item: 1
arstarstarst
History item: 1
yyy
History item: 1
Type "q" in help window to restore its previous buffer.
Mark set
History item: 1 [5 times]

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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 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 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)