From: Ted Zlatanov <tzz@lifelogs.com>
Cc: Emacs Development <emacs-devel@gnu.org>
Subject: Re: bug#5082: 23.1.50; print-circle and make-hash-table
Date: Wed, 2 Dec 2009 16:19:09 -0600 [thread overview]
Message-ID: <873a3thvdu.fsf@lifelogs.com> (raw)
In-Reply-To: <mailman.11874.1259601628.2239.bug-gnu-emacs@gnu.org> ("川幡太一 "'s message of "Tue, 1 Dec 2009 00:09:30 +0900")
The following message is a courtesy copy of an article
that has been posted to gnu.emacs.bug as well.
On Tue, 1 Dec 2009 00:09:30 +0900 川幡太一 <kawabata.taichi@gmail.com> wrote:
> Dear Emacs Developers,
> I've found an Emacs behavior that seems a bug concerning to `print-circle'
> and make-hash-table, so I would like to report it.
> By setting `print-circle' to `t', printing Lisp Object with recursive
> or repetitive
> list should be displayed as #N= and #N# syntax.
> However, it seems this is not true when printing lisp objects within
> hash tables
> (which become possible in Emacs 23.1.50.) Following is an example.
> Is it possible to display the repetitive lisp object within printed hash tables
> by #N= and #N# syntax, when `print-circle' is set to `t'?
> I notify this behavior as a bug, but it may not be so. I apologize in that
> case.
> (let ((print-circle t)
> (x (list 10 20))
> (y (make-hash-table)))
> (insert (format "%S\n" (list x x)))
> (puthash 1 x y)
> (puthash 2 x y)
> (insert (format "%S\n" y))
> (setcar x 3)
> (insert (format "%S\n" y)))
> Result:
(#1=(10 20) #1#)
#s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8
data (1 (10 20) 2 (10 20)))
#s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8
data (1 (3 20) 2 (3 20)))
> nil
I looked at the source in src/print.c. At the print_object() level the
behavior is correct for lists but fiendishly complicated so I couldn't
figure out the parallel structure for hashtables quickly. I'll put it
on my TODO list if no one else is interested.
Ted
next parent reply other threads:[~2009-12-02 22:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.11874.1259601628.2239.bug-gnu-emacs@gnu.org>
2009-12-02 22:19 ` Ted Zlatanov [this message]
2009-12-03 3:12 ` bug#5082: 23.1.50; print-circle and make-hash-table Glenn Morris
2009-12-03 17:25 ` Ted Zlatanov
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