From: Daniel Brooks <db48x@db48x.net>
To: arthur miller <arthur.miller@live.com>
Cc: "tomas@tuxteam.de" <tomas@tuxteam.de>,
"emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: Docs for &optional and &rest arguments together
Date: Thu, 31 Dec 2020 09:30:51 -0800 [thread overview]
Message-ID: <87y2hdopbo.fsf@db48x.net> (raw)
In-Reply-To: <AM0PR06MB6577E3D461AC55FBA72BB37496D60@AM0PR06MB6577.eurprd06.prod.outlook.com> (arthur miller's message of "Thu, 31 Dec 2020 17:08:10 +0000")
arthur miller <arthur.miller@live.com> writes:
> It Is flera för me hos it work. What I am saying is that docs does not
> say that we can't omit "optional" c or d when &rest is used. In the
> examples you are illustrating with, one can't omit say d and write
> (foo a b c e), both c and d are required, so user has to pass
> explicitly at least nil if not d is provided: (foo a b c nil e)
It has the same behavior even when there is no &rest argument. The
caller cannot omit argument c while still supplying argument d without
inserting a nil: (foo a b d) vs (foo a b nil d). Both c and d are
_optional_, because the caller deson't have to supply them. But it does
have to supply the earlier ones if it wants to supply the later ones.
db48x
next prev parent reply other threads:[~2020-12-31 17:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 13:26 Docs for &optional and &rest arguments together Arthur Miller
2020-12-29 15:10 ` Adam Porter
2020-12-29 17:06 ` arthur miller
2021-01-01 14:33 ` Arthur Miller
2020-12-30 3:12 ` Lars Ingebrigtsen
2020-12-30 12:19 ` Arthur Miller
2020-12-30 12:54 ` Yuri Khan
2020-12-31 4:43 ` Lars Ingebrigtsen
2020-12-31 7:55 ` arthur miller
2020-12-31 11:26 ` tomas
2020-12-31 16:45 ` Drew Adams
2020-12-31 17:04 ` Drew Adams
2020-12-31 17:28 ` arthur miller
2020-12-31 18:19 ` Drew Adams
2020-12-31 20:01 ` arthur miller
2020-12-31 20:27 ` Drew Adams
2020-12-31 17:08 ` arthur miller
2020-12-31 17:30 ` Daniel Brooks [this message]
2020-12-31 19:53 ` arthur miller
2020-12-31 19:40 ` tomas
-- strict thread matches above, loose matches on Subject: below --
2020-12-31 20:04 arthur miller
2020-12-31 20:35 ` tomas
2020-12-31 23:18 ` arthur miller
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