From: Michael Heerdegen <michael_heerdegen@web.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Is there a way of setting a variable only when it exists?
Date: Wed, 16 Mar 2022 01:47:44 +0100 [thread overview]
Message-ID: <875yoe3eq7.fsf@web.de> (raw)
In-Reply-To: 87a6drviwp.fsf@mbork.pl
Marcin Borkowski <mbork@mbork.pl> writes:
> What if it's an internal Emacs variable which might become a user option
> one day (I submitted a bug report about it) and then my customization
> silently disappears?
That normally does not happen. `defcustom' doesn't alter existing
bindings. You can still `setq' a user option. There is no problem
unless the "meaning" of the variable values changed in an backward
incompatible way. I guess nothing can protect against that.
The only notable case I can think of is when things change so that
setting the variable doesn't have the expected effect any more because
the custom setter has gotten additional side effects (more than only
setting the value). Is that your concern?
Michael.
next prev parent reply other threads:[~2022-03-16 0:47 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-14 6:00 Is there a way of setting a variable only when it exists? Marcin Borkowski
2022-03-14 12:52 ` Eli Zaretskii
2022-03-14 13:16 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-14 13:48 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15 6:17 ` Marcin Borkowski
2022-03-15 6:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15 6:58 ` Jean Louis
2022-03-15 7:45 ` Marcin Borkowski
2022-03-15 8:12 ` Jean Louis
2022-03-15 7:49 ` tomas
2022-03-15 8:13 ` Jean Louis
2022-03-15 8:36 ` tomas
2022-03-15 9:28 ` Jean Louis
2022-03-15 10:01 ` tomas
2022-03-15 11:29 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15 8:14 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15 15:33 ` [External] : " Drew Adams
2022-03-15 15:38 ` Drew Adams
2022-03-16 18:32 ` Marcin Borkowski
2022-03-16 0:47 ` Michael Heerdegen [this message]
2022-03-16 18:33 ` Marcin Borkowski
2022-03-16 6:02 ` Tomas Nordin
2022-03-16 6:37 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-16 18:34 ` Marcin Borkowski
2022-03-15 6:48 ` Jean Louis
2022-03-14 22:09 ` Michael Heerdegen
2022-03-15 6:16 ` Marcin Borkowski
2022-03-15 7:05 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-16 0:25 ` Michael Heerdegen
2022-03-16 18:33 ` Marcin Borkowski
2022-03-16 19:25 ` Michael Heerdegen
2022-03-18 5:58 ` Marcin Borkowski
2022-03-16 20:35 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-17 20:47 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-18 5:59 ` Marcin Borkowski
2022-03-18 17:59 ` Jean Louis
2022-03-19 9:25 ` Emanuel Berg via Users list for the GNU Emacs text editor
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