GNU bug report logs - #23926
defcustom with STANDARD=<non-constant-expression> gives confusing results

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Message #55 received at 23926 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 23926 <at> debbugs.gnu.org, Drew Adams <drew.adams <at> oracle.com>
Subject: Re: bug#23926: defcustom with STANDARD=<non-pure-expression> gives
 confusing results
Date: Sat, 09 Jul 2016 16:48:23 -0400

Eli Zaretskii <eliz <at> gnu.org> writes:
> Of course, I do.  Maybe you don't realize how many times Emacs
> evaluates the value of a defcustom, but I do.

What about making Emacs evaluate it less? e.g. replace occurences of
(eval (car (get var 'standard-value))) with

(or (get var 'original-value)
    (let ((val (eval (car (get var 'standard-value)))))
      (put var 'original-value val)
      val))

Wrapped in a function of course, call it custom-get-standard-value?

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