* bug#18012: 24.3; Can't print a huge list structure in IELM
@ 2014-07-14 7:11 sindikat
2016-08-09 1:47 ` npostavs
2021-09-04 8:40 ` Lars Ingebrigtsen
0 siblings, 2 replies; 6+ messages in thread
From: sindikat @ 2014-07-14 7:11 UTC (permalink / raw)
To: 18012
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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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)
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18012: 24.3; Can't print a huge list structure in IELM
2014-07-14 7:11 bug#18012: 24.3; Can't print a huge list structure in IELM sindikat
@ 2016-08-09 1:47 ` npostavs
2018-04-12 13:32 ` Basil L. Contovounesios
2021-09-04 8:40 ` Lars Ingebrigtsen
1 sibling, 1 reply; 6+ messages in thread
From: npostavs @ 2016-08-09 1:47 UTC (permalink / raw)
To: sindikat@mail36.net; +Cc: 18012
severity 18012 minor
quit
sindikat@mail36.net (sindikat@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?
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18012: 24.3; Can't print a huge list structure in IELM
2016-08-09 1:47 ` npostavs
@ 2018-04-12 13:32 ` Basil L. Contovounesios
2018-04-12 13:44 ` Basil L. Contovounesios
2018-04-12 14:21 ` Noam Postavsky
0 siblings, 2 replies; 6+ messages in thread
From: Basil L. Contovounesios @ 2018-04-12 13:32 UTC (permalink / raw)
To: npostavs; +Cc: sindikat@mail36.net, 18012
npostavs@users.sourceforge.net writes:
> sindikat@mail36.net (sindikat@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
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18012: 24.3; Can't print a huge list structure in IELM
2018-04-12 13:32 ` Basil L. Contovounesios
@ 2018-04-12 13:44 ` Basil L. Contovounesios
2018-04-12 14:21 ` Noam Postavsky
1 sibling, 0 replies; 6+ messages in thread
From: Basil L. Contovounesios @ 2018-04-12 13:44 UTC (permalink / raw)
To: npostavs; +Cc: sindikat@mail36.net, 18012
"Basil L. Contovounesios" <contovob@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
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18012: 24.3; Can't print a huge list structure in IELM
2018-04-12 13:32 ` Basil L. Contovounesios
2018-04-12 13:44 ` Basil L. Contovounesios
@ 2018-04-12 14:21 ` Noam Postavsky
1 sibling, 0 replies; 6+ messages in thread
From: Noam Postavsky @ 2018-04-12 14:21 UTC (permalink / raw)
To: Basil L. Contovounesios; +Cc: sindikat@mail36.net, 18012, npostavs
"Basil L. Contovounesios" <contovob@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).
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18012: 24.3; Can't print a huge list structure in IELM
2014-07-14 7:11 bug#18012: 24.3; Can't print a huge list structure in IELM sindikat
2016-08-09 1:47 ` npostavs
@ 2021-09-04 8:40 ` Lars Ingebrigtsen
1 sibling, 0 replies; 6+ messages in thread
From: Lars Ingebrigtsen @ 2021-09-04 8:40 UTC (permalink / raw)
To: sindikat; +Cc: 18012
sindikat@mail36.net (sindikat@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
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-09-04 8:40 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-07-14 7:11 bug#18012: 24.3; Can't print a huge list structure in IELM sindikat
2016-08-09 1:47 ` npostavs
2018-04-12 13:32 ` Basil L. Contovounesios
2018-04-12 13:44 ` Basil L. Contovounesios
2018-04-12 14:21 ` Noam Postavsky
2021-09-04 8:40 ` Lars Ingebrigtsen
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