From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: arthur miller Newsgroups: gmane.emacs.devel Subject: RE: Docs for &optional and &rest arguments together Date: Thu, 31 Dec 2020 19:53:25 +0000 Message-ID: References: <87o8icq958.fsf@gnus.org> <877doyoa9g.fsf@gnus.org> <20201231112634.GA5158@tuxteam.de> , <87y2hdopbo.fsf@db48x.net> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="_000_AM0PR06MB6577093685FBD535111B2ECD96D60AM0PR06MB6577eurp_" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11633"; mail-complaints-to="usenet@ciao.gmane.io" Cc: "tomas@tuxteam.de" , "emacs-devel@gnu.org" To: Daniel Brooks Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Dec 31 20:55:05 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kv42K-0002sq-Fd for ged-emacs-devel@m.gmane-mx.org; 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envelope-from=arthur.miller@live.com; helo=EUR06-VI1-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:262198 Archived-At: --_000_AM0PR06MB6577093685FBD535111B2ECD96D60AM0PR06MB6577eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jepp. I come on that after I sent first mail and didn't wanted to complicat= e more later. I don't think docs mention it properly. -------- Originalmeddelande -------- Fr=E5n: Daniel Brooks Datum: 2020-12-31 18:30 (GMT+01:00) Till: arthur miller Kopia: tomas@tuxteam.de, emacs-devel@gnu.org =C4mne: Re: Docs for &optional and &rest arguments together arthur miller writes: > It Is flera f=F6r 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 --_000_AM0PR06MB6577093685FBD535111B2ECD96D60AM0PR06MB6577eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jepp. I come on that after I sent first mail and didn't w= anted to complicate more later. I don't think docs mention it properly.


-------- Originalmeddelande --------
Fr=E5n: Daniel Brooks <db48x@db48x.net>
Datum: 2020-12-31 18:30 (GMT+01:00)
Till: arthur miller <arthur.miller@live.com>
Kopia: tomas@tuxteam.de, emacs-devel@gnu.org
=C4mne: Re: Docs for &optional and &rest arguments together

arthur miller <arthur.miller@live.com> write= s:

> It Is flera f=F6r me hos it work. What I am saying is that docs does n= ot
> say that we can't omit "optional" c or d when &rest is u= sed. 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
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