GNU bug report logs - #13811
[Leo Liu] Byte-compile lexical-scoped elisp

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13811: closed ([Leo Liu] Byte-compile lexical-scoped elisp)
Date: Mon, 25 Feb 2013 16:09:02 +0000

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Your message dated Mon, 25 Feb 2013 11:06:54 -0500
with message-id <jwv1uc4tmfo.fsf-monnier+emacs <at> gnu.org>
and subject line Re: Byte-compile lexical-scoped elisp
has caused the debbugs.gnu.org bug report #13811,
regarding [Leo Liu] Byte-compile lexical-scoped elisp
to be marked as done.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: [Leo Liu] Byte-compile lexical-scoped elisp
Date: Mon, 25 Feb 2013 10:07:56 -0500

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Forwarding to get a bug-number.

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From: Leo Liu <sdl.web <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Byte-compile lexical-scoped elisp
Date: Mon, 25 Feb 2013 20:43:53 +0800

Hello Stefan,

I got a bug report on ack.el (https://github.com/leoliu/ack-el/issues/1)
when running ack.el uncompiled.

The steps to reproduce:

1. wget https://github.com/leoliu/ack-el/raw/master/ack.el
2. Emacs -q -l ack.el
3. M-x ack

file-name-nondirectory: Symbol's value as variable is void: project-root

Could you help me understand what is wrong here? It seems when
uncompiled project-root is not treated as a special variable.

Thank you,
Leo

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Leo Liu <sdl.web <at> gmail.com>
Cc: 13811-done <at> debbugs.gnu.org
Subject: Re: Byte-compile lexical-scoped elisp
Date: Mon, 25 Feb 2013 11:06:54 -0500

> The steps to reproduce:
> 1. wget https://github.com/leoliu/ack-el/raw/master/ack.el
> 2. Emacs -q -l ack.el
> 3. M-x ack
> file-name-nondirectory: Symbol's value as variable is void: project-root

Indeed, the problem is that the dynamic binding of project-root is
created inside the `interactive' spec and that spec is not run in the
proper lexical environment (it is run in lexical mode, but in an empty
lexical environment).

> Could you help me understand what is wrong here?

A bug in Emacs.  Should be fixed on the trunk now.

BTW, please add an "ack--" prefix to your `project-root' var: all
`defvar'd variables should have such a prefix.


        Stefan

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