GNU bug report logs - #16153
24.3.50; (gv-ref (car (cdr x))) => strange expression

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 16153 in the body.
You can then email your comments to 16153 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

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

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; (gv-ref (car (cdr x))) => strange expression
Date: Sun, 15 Dec 2013 07:29:05 +0100

Hi,

Sorry if I speak nonsense, but that doesn't make sense to me:

(setq x '(1 (2 3) 4))

(setq ref (gv-ref (car (cdr x))))

  ==>
  
   ((lambda nil
     (car #1=#:v))
    lambda
    (gv--val)
    (setcar #1# gv--val))


(gv-deref ref)

Symbol's value as variable is void: #:v

Seems like `gv-letplace' is constructing an illegitimate expression with
a free variable here.


Regards,

Michael.




In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.4)
 of 2013-11-13 on drachen
Windowing system distributor `The X.Org Foundation', version 11.0.11403000
System Description:	Debian GNU/Linux testing (jessie)

Configured using:
 `configure --prefix=/usr/local/built/'

Important settings:
  value of $LC_ALL: de_DE.utf8
  value of $LC_COLLATE: C
  value of $LC_TIME: C
  value of $LANG: de_DE.utf8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Message #8 received at 16153 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: 16153 <at> debbugs.gnu.org
Subject: Re: bug#16153: 24.3.50; (gv-ref (car (cdr x))) => strange expression
Date: Sun, 15 Dec 2013 07:51:16 +0100

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> Symbol's value as variable is void: #:v

Oh, let me add that this doesn't happen with lexical-binding.  But I
guess it should work for dynamic binding as well.


Regards,

Michael.

Message #11 received at 16153 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 16153 <at> debbugs.gnu.org
Subject: Re: bug#16153: 24.3.50; (gv-ref (car (cdr x))) => strange expression
Date: Sun, 15 Dec 2013 08:02:47 -0500

>> Symbol's value as variable is void: #:v
> Oh, let me add that this doesn't happen with lexical-binding.  But I
> guess it should work for dynamic binding as well.

In general, `gv-ref' only works with lexical-binding.


        Stefan

Message #18 received at 16153 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 16153 <at> debbugs.gnu.org
Subject: Re: bug#16153: 24.3.50; (gv-ref (car (cdr x))) => strange expression
Date: Mon, 16 Dec 2013 01:32:41 +0100

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

> In general, `gv-ref' only works with lexical-binding.

I see.  Maybe say this somewhere - in the doc string, or at least in the
source code.  It's IMHO not obvious (or is it?).


Thanks,

Michael.

Message #23 received at 16153-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 16153-done <at> debbugs.gnu.org
Subject: Re: bug#16153: 24.3.50; (gv-ref (car (cdr x))) => strange expression
Date: Mon, 16 Dec 2013 14:11:55 -0500

>> In general, `gv-ref' only works with lexical-binding.
> I see.  Maybe say this somewhere - in the doc string, or at least in the
> source code.  It's IMHO not obvious (or is it?).

I added a note in the docstring, thank you,


        Stefan

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.