From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Chong Yidong <cyd@gnu.org>
Cc: Bastien Guerry <bzg@gnu.org>, emacs-devel@gnu.org
Subject: Re: Evil defvars in org.el
Date: Fri, 27 Apr 2012 22:14:29 -0400 [thread overview]
Message-ID: <jwvehr8zjw4.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87k411g8xa.fsf@gnu.org> (Chong Yidong's message of "Fri, 27 Apr 2012 11:17:37 +0800")
> org.el (and org-agenda.el, and maybe others) have defvars like this:
> (defvar entry)
> (defvar date)
> This is going to blow up in someone's face, because it makes `entry' and
> `date' unusable as lexical variables, even though those are very common
> variable names.
While I strongly support fixing such things, do note that since those
cases are very common, the lexical-binding code had to find a way to
avoid this mess. So in reality in Emacs-24 such (defvar <foo>) only
affect the current file (actually only the current scope, so you can do
(defun test () (defvar toto) (let (toto ...) ...)) and `toto' will only
be dynbound within `test'.
On the other hand, in the case of eieio's `this' we can't so easily
avoid the mess, because `this' is declared with a global value, making
it *globally* dynamically bound.
Stefan
next prev parent reply other threads:[~2012-04-28 2:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-27 3:17 Evil defvars in org.el Chong Yidong
2012-04-27 6:07 ` Bastien
2012-04-27 14:48 ` Bastien
2012-04-27 14:57 ` Edward Reingold
2012-04-27 16:14 ` Bastien
2012-04-27 17:09 ` SAKURAI Masashi
2012-04-27 16:05 ` Glenn Morris
2012-04-27 16:33 ` Drew Adams
2012-04-28 0:15 ` Miles Bader
2012-04-28 0:17 ` Drew Adams
2012-04-28 0:48 ` Miles Bader
2012-04-28 2:25 ` Chong Yidong
2012-05-04 6:56 ` Glenn Morris
2012-05-04 15:29 ` Stefan Monnier
2012-05-04 20:53 ` Johan Bockgård
2012-05-05 0:37 ` Stefan Monnier
2012-05-05 20:00 ` Glenn Morris
2012-05-07 14:57 ` Stefan Monnier
2012-04-28 2:14 ` Stefan Monnier [this message]
2012-04-28 5:57 ` Achim Gratz
2012-04-28 15:10 ` Stefan Monnier
2012-04-28 16:31 ` Achim Gratz
2012-04-28 19:33 ` Stefan Monnier
2012-04-28 6:00 ` Drew Adams
2012-05-08 22:48 ` Martyn Jago
2012-05-09 17:37 ` Stefan Monnier
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