From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Porter <adam@alphapapa.net>
Subject: Re: function for inserting a block
Date: Sun, 03 Sep 2017 03:19:52 -0500
Message-ID: <878thwdwif.fsf@alphapapa.net>
References: <877exghblx.fsf@ericabrahamsen.net>
	<87efromccg.fsf@nicolasgoaziou.fr>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Return-path: <emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:42341)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1doQ8v-0004DA-Iq
	for emacs-orgmode@gnu.org; Sun, 03 Sep 2017 04:20:40 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1doQ8l-000155-Ah
	for emacs-orgmode@gnu.org; Sun, 03 Sep 2017 04:20:27 -0400
Received: from [195.159.176.226] (port=40745 helo=blaine.gmane.org)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <geo-emacs-orgmode@m.gmane.org>)
	id 1doQ8l-000146-3h
	for emacs-orgmode@gnu.org; Sun, 03 Sep 2017 04:20:23 -0400
Received: from list by blaine.gmane.org with local (Exim 4.84_2)
	(envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1doQ8R-0007JV-9c
	for emacs-orgmode@gnu.org; Sun, 03 Sep 2017 10:20:03 +0200
List-Id: "General discussions about Org-mode." <emacs-orgmode.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-orgmode>,
	<mailto:emacs-orgmode-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/emacs-orgmode/>
List-Post: <mailto:emacs-orgmode@gnu.org>
List-Help: <mailto:emacs-orgmode-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-orgmode>,
	<mailto:emacs-orgmode-request@gnu.org?subject=subscribe>
Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org
Sender: "Emacs-orgmode"
	<emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org>
To: emacs-orgmode@gnu.org

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> You need to clean these markers at the end of the function. Markers set
> to a position are never garbage-collected. Usually, it happens at the
> end of an `unwind-protect'.

Not that I oppose cleaning up markers after you're done with them, but
are they actually never collected?  The manual says:

"...it is a good idea to make a marker point nowhere if you are sure you
don’t need it any more.  Markers that can no longer be accessed are
eventually removed (*note Garbage Collection::)."

I asked on /r/emacs about this but never got a firm answer; some thought
that they are never collected and require manual clearing, others
thought that ones that go out-of-scope are eventually collected and that
it's not typically necessary to clear them manually.  I also recall
seeing some code recently that didn't manually clear the markers it
created, so I wonder if that is true.