From: MON KEY <monkey@sandpframing.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: 7083@debbugs.gnu.org
Subject: bug#7083: Why is `copy-tree's symbol-plist carrying side-effect-free error-free?
Date: Thu, 23 Sep 2010 01:23:44 -0400 [thread overview]
Message-ID: <AANLkTinneqVAA3f+MBKH26Uw6cq0+jVxa5AOVhAzXdKj@mail.gmail.com> (raw)
In-Reply-To: <m2r5gltq9v.fsf@igel.home>
On Wed, Sep 22, 2010 at 5:35 PM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> MON KEY <monkey@sandpframing.com> writes:
>
>> It (potentially) `nconc's `nreverse's and `aset's the TREE arg recursively.
>
> Only the copy.
>
Only for the copy of a list.
Why has this bug been marked done?
When copy-tree copies vectors they share structure.
(let ((orig '((a b) (c d) (e f) (g h)))
new-cp)
(setq new-cp (copy-tree orig))
(equal (elt
(prog1 orig
(setf (car new-cp) "bubba")) 0)
'(a b)))
;=> t
(let ((orig [[a b] [c d] [e f] [g h]])
new-cp)
(setq new-cp (copy-tree orig))
(string-equal (aref (prog1 orig
(aset new-cp 0 "bubba"))
0)
"bubba"))
;=> t
Shouldn't idx 0 of the orig tree still be [a b]?
If not, it should be documented that when copy-tree copies vectors the
"copy" will share structure just as with `copy-sequence'.
Regardless, simply marking the bug report as done with only a terse 3
word reply is obnoxious and not the least bit helpful for anyone else
referencing this report in the future, esp. as there does appear to be
a bug.
> Andreas.
--
/s_P\
next prev parent reply other threads:[~2010-09-23 5:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-22 6:31 bug#7083: Why is `copy-tree's symbol-plist carrying side-effect-free error-free? MON KEY
2010-09-22 21:35 ` Andreas Schwab
2010-09-23 5:23 ` MON KEY [this message]
2010-09-23 22:19 ` Stefan Monnier
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