GNU bug report logs - #18012
24.3; Can't print a huge list structure in IELM

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: sindikat <at> mail36.net (sindikat <at> mail36.net)
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; Can't print a huge list structure in IELM
Date: Mon, 14 Jul 2014 13:11:58 +0600

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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Message #8 received at 18012 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: sindikat <at> mail36.net (sindikat <at> mail36.net)
Cc: 18012 <at> debbugs.gnu.org
Subject: Re: bug#18012: 24.3; Can't print a huge list structure in IELM
Date: Mon, 08 Aug 2016 21:47:30 -0400

severity 18012 minor
quit

sindikat <at> mail36.net (sindikat <at> mail36.net) writes:

> 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)

It seems that the circularity check when print-circle is nil stops at a
depth of 200.

(prin1 (nestify (number-sequence 1 200))) ;=> (error "Apparently circular structure being printed")

Setting print-circle to t makes this (and printing for ielm) work fine.
Maybe ielm should bind print-circle to t always?

Message #13 received at 18012 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: npostavs <at> users.sourceforge.net
Cc: "sindikat <at> mail36.net" <sindikat <at> mail36.net>, 18012 <at> debbugs.gnu.org
Subject: Re: bug#18012: 24.3; Can't print a huge list structure in IELM
Date: Thu, 12 Apr 2018 14:32:16 +0100

npostavs <at> users.sourceforge.net writes:

> sindikat <at> mail36.net (sindikat <at> mail36.net) writes:
>
>> 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)
>
> It seems that the circularity check when print-circle is nil stops at a
> depth of 200.
>
> (prin1 (nestify (number-sequence 1 200))) ;=> (error "Apparently circular
> structure being printed")
>
> Setting print-circle to t makes this (and printing for ielm) work fine.
> Maybe ielm should bind print-circle to t always?

I agree, given that ielm now uses cl-prin1:

81b5131e11: 2018-01-15 17:04:05 -0500
  * lisp/ielm.el (ielm-eval-input): Use cl-print.
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=81b5131e11fa96d32a1718c6e2ebf40994d7d281

and thus infloops in the following scenario:

1. emacs -Q
2. M-x emacs-version RET
     => GNU Emacs 27.0.50
        (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
        of 2018-04-08
3. M-x ielm RET
4. (let ((l (make-list 2 0)))
     (nconc l (cdr l)))
5. C-m
     => infloop
6. C-g
     => *** IELM Error ***  Quit during pretty-printing

This is in contrast to the *scratch* buffer, where C-j correctly inserts
the result of (4) as (0 0 . #1), presumably because pp is used instead
of cl-prin1.

Does this behaviour warrant a new bug?

-- 
Basil

Message #16 received at 18012 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: npostavs <at> users.sourceforge.net
Cc: "sindikat <at> mail36.net" <sindikat <at> mail36.net>, 18012 <at> debbugs.gnu.org
Subject: Re: bug#18012: 24.3; Can't print a huge list structure in IELM
Date: Thu, 12 Apr 2018 14:44:14 +0100

"Basil L. Contovounesios" <contovob <at> tcd.ie> writes:

> 1. emacs -Q
> 2. M-x emacs-version RET
>      => GNU Emacs 27.0.50
>         (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
>         of 2018-04-08
> 3. M-x ielm RET
> 4. (let ((l (make-list 2 0)))
>      (nconc l (cdr l)))
> 5. C-m
>      => infloop
> 6. C-g
>      => *** IELM Error ***  Quit during pretty-printing
>
> This is in contrast to the *scratch* buffer, where C-j correctly inserts
> the result of (4) as (0 0 . #1), presumably because pp is used instead
> of cl-prin1.
>
> Does this behaviour warrant a new bug?

I say "correctly", but I mean "without inflooping", as I am not sure
how, if at all, circular objects should be printed when print-circle is
nil.

Note that there is no infloop when printing a "top-level" circle, e.g.:

  (let ((l (list 0)))
    (nconc l l))

-- 
Basil

Message #19 received at 18012 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: "Basil L. Contovounesios" <contovob <at> tcd.ie>
Cc: "sindikat <at> mail36.net" <sindikat <at> mail36.net>, 18012 <at> debbugs.gnu.org,
 npostavs <at> users.sourceforge.net
Subject: Re: bug#18012: 24.3; Can't print a huge list structure in IELM
Date: Thu, 12 Apr 2018 10:21:54 -0400

"Basil L. Contovounesios" <contovob <at> tcd.ie> writes:

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

>> (prin1 (nestify (number-sequence 1 200))) ;=> (error "Apparently circular
>> structure being printed")
>>
>> Setting print-circle to t makes this (and printing for ielm) work fine.
>> Maybe ielm should bind print-circle to t always?
>
> I agree, given that ielm now uses cl-prin1:

On the other hand, wouldn't it be confusing if ielm printing behaves
differently from normal printing?  Maybe all that needs to be fixed is
the ielm error message for this case, which seems fairly uninformative
at the moment.

> 1. emacs -Q
> 2. M-x emacs-version RET
>      => GNU Emacs 27.0.50
>         (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
>         of 2018-04-08
> 3. M-x ielm RET
> 4. (let ((l (make-list 2 0)))
>      (nconc l (cdr l)))
> 5. C-m
>      => infloop
> 6. C-g
>      => *** IELM Error ***  Quit during pretty-printing

> Does this behaviour warrant a new bug?

Yes, I would say so (for cl-prin1 specifically).

Message #22 received at 18012 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: sindikat <at> mail36.net
Cc: 18012 <at> debbugs.gnu.org
Subject: Re: bug#18012: 24.3; Can't print a huge list structure in IELM
Date: Sat, 04 Sep 2021 10:40:57 +0200

sindikat <at> mail36.net (sindikat <at> mail36.net) writes:

> 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.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

This has changed a bit since this was reported.  It now says:

ELISP> (nestify (number-sequence 1 1000))
*** IELM Error ***  Error during pretty-printing (bug in pp): (scan-error "Unbalanced parentheses" 1 385)

and a message in the echo area saying

cl-prin1: (error "Lisp nesting exceeds ‘max-lisp-eval-depth’") [6 times]

I've now removed the confusing (and misleading) "(bug in pp)" from the
error message, and but the rest seems pretty much correct (when dealing
with things that Emacs can't print because of issues like this), so I'm
closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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