GNU bug report logs - #21311
25.0.50; non-defvared hooks are not declared special with lexical-binding

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

From: Tassilo Horn <tsdh <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Fri, 21 Aug 2015 13:59:16 +0200

It seems that hooks that are not declared using defvar but come into
being just because of a (add-hook 'my-hook ...) are not declared as
special meaning you cannot let-bind them to change their value in the
dynamic scope of the let.

Here's a demo file hook-test.el:

--8<---------------cut here---------------start------------->8---
;; -*- lexical-binding: t; -*-

;; (defvar th/test-hook) ; Fix #1
(add-hook 'th/test-hook 'foo)

(defun th/test-hook-show ()
  (message "HOOK: %s" th/test-hook))

(defun th/test-hook-let ()
  ;; (defvar th/test-hook)  ; Fix #2
  (let ((th/test-hook nil))
    (th/test-hook-show)))

(th/test-hook-show)
(th/test-hook-let)
--8<---------------cut here---------------end--------------->8---

1. $ emacs -Q --load hook-test.el hook-test.el

2. Eval the two funcalls: both message (foo) as th/test-hook's value.
   With the latter, I had expected to get the value nil.

The bug disappears as soon as I

  - don't use lexical-binding, or
  - defvar the hook (Fix #1 or #2)



In GNU Emacs 25.0.50.15 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-08-21 on thinkpad-t440p
Repository revision: ff2f35fc478d0047fef4ae3e0b09f43c37961bec
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
System Description:	Arch Linux

Configured using:
 `configure 'CFLAGS=-g -ggdb3 -O1''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

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  transient-mark-mode: t

Recent messages:
th/test-hook-let
HOOK: (foo)
"HOOK: (foo)"
Auto-saving...done
HOOK: nil
"HOOK: nil"
previous-line: Beginning of buffer [2 times]
For this change to take effect revisit file using M-x revert-buffer
Saving file /home/horn/hook-test.el...
Wrote /home/horn/hook-test.el

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Message #8 received at 21311 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 21311 <at> debbugs.gnu.org
Subject: Re: bug#21311: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Fri, 21 Aug 2015 09:48:53 -0400

> It seems that hooks that are not declared using defvar but come into
> being just because of a (add-hook 'my-hook ...) are not declared as
> special meaning you cannot let-bind them to change their value in the
> dynamic scope of the let.

Yes.

> The bug disappears as soon as I
>   - don't use lexical-binding, or
>   - defvar the hook (Fix #1 or #2)

I think either of fix #1 or #2 are proper fixes and I think there's not
much more we can do about it.

If the hook hasn't been created yet at all (neither defvar, nor
add-hook) then fix #1 or #2 are really the only options.

Arguably, nowadays packages should defvar all their hooks.


        Stefan

Message #11 received at 21311 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>, Tassilo Horn <tsdh <at> gnu.org>
Cc: 21311 <at> debbugs.gnu.org
Subject: RE: bug#21311: 25.0.50; non-defvared hooks are not declared special
 with lexical-binding
Date: Fri, 21 Aug 2015 08:03:10 -0700 (PDT)

> Arguably, nowadays packages should defvar all their hooks.

Just arguably, or is this something that Emacs should recommend
to its users?  If the latter, please do so.

Message #14 received at 21311 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 21311 <at> debbugs.gnu.org
Subject: Re: bug#21311: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Fri, 21 Aug 2015 17:40:32 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> It seems that hooks that are not declared using defvar but come into
>> being just because of a (add-hook 'my-hook ...) are not declared as
>> special meaning you cannot let-bind them to change their value in the
>> dynamic scope of the let.
>
> Yes.
>
>> The bug disappears as soon as I
>>   - don't use lexical-binding, or
>>   - defvar the hook (Fix #1 or #2)
>
> I think either of fix #1 or #2 are proper fixes and I think there's not
> much more we can do about it.

Allright.

> Arguably, nowadays packages should defvar all their hooks.

Ok, then I'll issue a bug report for magit.  That's the package whose
non-defvared hook I wanted to let-bind.

Bye,
Tassilo

Message #17 received at 21311 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 21311 <at> debbugs.gnu.org
Subject: Re: bug#21311: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Sat, 22 Aug 2015 08:05:04 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Arguably, nowadays packages should defvar all their hooks.

For the record, I've filed an issue for magit where I've encountered the
problem:

    https://github.com/magit/magit/issues/2198

Bye,
Tassilo

Message #20 received at 21311 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 21311 <at> debbugs.gnu.org
Subject: Re: bug#21311: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Sat, 22 Aug 2015 14:12:11 -0400

So is there anything for Emacs to do?
If not, please close this.

Message #25 received at 21311-done <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 21311-done <at> debbugs.gnu.org
Subject: Re: bug#21311: 25.0.50;
 non-defvared hooks are not declared special with lexical-binding
Date: Sun, 23 Aug 2015 07:17:31 +0200

Glenn Morris <rgm <at> gnu.org> writes:

> So is there anything for Emacs to do?
> If not, please close this.

Done.

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