From: Drew Adams <drew.adams@oracle.com>
To: Noam Postavsky <npostavs@users.sourceforge.net>, 23926@debbugs.gnu.org
Subject: bug#23926: defcustom with STANDARD=<non-pure-expression> gives confusing results
Date: Fri, 8 Jul 2016 23:31:17 -0700 (PDT) [thread overview]
Message-ID: <0331acec-645d-4362-8e9a-a18433b518df@default> (raw)
In-Reply-To: <CAM-tV-8cG3gLgf-A+wBYPZWNy2WPGFV3uEdNE7=ad3oq4rXmnw@mail.gmail.com>
Calling such an expression "non-pure" can be misleading.
The concept you are looking for is apparently just non-constant,
IOW, an expression whose value is not always the same.
IOW the expression is not referentially transparent.
But in Lisp non-pure often refers to or suggests side effects,
esp. mutation of structure. That's not required for this bug
to manifest. All that's needed is for the expression to not
necessarily return the same value each time it is evaluated.
Anyway, yes, I agree that filing another bug for this
(separate from #4755) is good.
next prev parent reply other threads:[~2016-07-09 6:31 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-09 3:11 bug#23926: defcustom with STANDARD=<non-pure-expression> gives confusing results Noam Postavsky
2016-07-09 6:31 ` Drew Adams [this message]
2016-07-09 7:13 ` Eli Zaretskii
2016-07-09 11:54 ` npostavs
2016-07-09 12:31 ` Eli Zaretskii
2016-07-09 12:55 ` Noam Postavsky
2016-07-09 13:14 ` Eli Zaretskii
2016-07-09 13:48 ` Noam Postavsky
2016-07-09 14:03 ` Eli Zaretskii
2016-07-12 3:26 ` npostavs
2016-07-12 5:20 ` Eli Zaretskii
2016-07-09 14:34 ` Drew Adams
[not found] ` <<8360sehps4.fsf@gnu.org>
2016-07-09 14:54 ` Drew Adams
2016-07-09 15:09 ` Drew Adams
2016-07-10 17:23 ` Drew Adams
2023-10-17 14:19 ` bug#23926: defcustom with STANDARD=<non-constant-expression> " Mauro Aranda
2023-10-17 14:29 ` Mauro Aranda
[not found] <<<<<CAM-tV-8cG3gLgf-A+wBYPZWNy2WPGFV3uEdNE7=ad3oq4rXmnw@mail.gmail.com>
[not found] ` <<<<<83vb0fgu83.fsf@gnu.org>
[not found] ` <<<<443f2e44-5167-48e7-abc6-cce1e243461e@default>
[not found] ` <<<<8337nihpdw.fsf@gnu.org>
[not found] ` <<<c0dd88c2-51ef-4f4f-964c-f0254db970f7@default>
[not found] ` <<<83zipqg3e3.fsf@gnu.org>
[not found] ` <<ff33c2cc-337a-433b-a87a-0ea1814311d2@default>
[not found] ` <<83bn24c8io.fsf@gnu.org>
2016-07-12 0:53 ` bug#23926: defcustom with STANDARD=<non-pure-expression> " Drew Adams
[not found] <<<CAM-tV-8cG3gLgf-A+wBYPZWNy2WPGFV3uEdNE7=ad3oq4rXmnw@mail.gmail.com>
[not found] ` <<<83vb0fgu83.fsf@gnu.org>
[not found] ` <<443f2e44-5167-48e7-abc6-cce1e243461e@default>
[not found] ` <<8337nihpdw.fsf@gnu.org>
2016-07-09 14:59 ` Drew Adams
2016-07-09 16:52 ` Eli Zaretskii
2016-07-09 20:48 ` npostavs
2016-07-10 14:19 ` Eli Zaretskii
[not found] ` <<871t32ilm0.fsf@users.sourceforge.net>
[not found] ` <<83k2gtfue4.fsf@gnu.org>
2016-07-10 17:18 ` Drew Adams
2016-07-11 18:40 ` Eli Zaretskii
[not found] <<CAM-tV-8cG3gLgf-A+wBYPZWNy2WPGFV3uEdNE7=ad3oq4rXmnw@mail.gmail.com>
[not found] ` <<83vb0fgu83.fsf@gnu.org>
2016-07-09 14:09 ` Drew Adams
2016-07-09 14:12 ` Eli Zaretskii
[not found] ` <<c0dd88c2-51ef-4f4f-964c-f0254db970f7@default>
[not found] ` <<83zipqg3e3.fsf@gnu.org>
2016-07-10 17:18 ` Drew Adams
2016-07-11 18:52 ` Eli Zaretskii
[not found] <<<<CAM-tV-8cG3gLgf-A+wBYPZWNy2WPGFV3uEdNE7=ad3oq4rXmnw@mail.gmail.com>
[not found] ` <<<<83vb0fgu83.fsf@gnu.org>
[not found] ` <<<443f2e44-5167-48e7-abc6-cce1e243461e@default>
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