From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel Newsgroups: gmane.emacs.bugs Subject: bug#31715: cl-incf and cl-decf error out when passed a nil-valued variable as 'offset' Date: Tue, 5 Jun 2018 19:01:56 -0400 Message-ID: <6176bcee-a8da-8547-762b-4174652ad2a0@live.com> References: <1dff07f6-8da4-4e4c-a700-0bc39d6f2aa6@live.com> <874lii88hy.fsf@gmail.com> <87o9gqw21y.fsf@web.de> <871sdm851q.fsf@gmail.com> <87k1rc7sly.fsf@gmail.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="qJlmaD5nQCoyKtOLGGEXXWx6D6WO5Yy8j" X-Trace: blaine.gmane.org 1528239672 32004 195.159.176.226 (5 Jun 2018 23:01:12 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 5 Jun 2018 23:01:12 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Cc: Michael Heerdegen , 31715@debbugs.gnu.org To: Noam Postavsky Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Jun 06 01:01:08 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fQKwp-00087U-Cm for geb-bug-gnu-emacs@m.gmane.org; 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boundary="sZJnlp2isG5XXx23F1UTcLcFwCaBYBcaD"; protected-headers="v1" From: =?UTF-8?Q?Cl=c3=a9ment_Pit-Claudel?= To: Noam Postavsky Cc: Michael Heerdegen , 31715@debbugs.gnu.org Message-ID: <6176bcee-a8da-8547-762b-4174652ad2a0@live.com> Subject: Re: bug#31715: cl-incf and cl-decf error out when passed a nil-valued variable as 'offset' References: <1dff07f6-8da4-4e4c-a700-0bc39d6f2aa6@live.com> <874lii88hy.fsf@gmail.com> <87o9gqw21y.fsf@web.de> <871sdm851q.fsf@gmail.com> <87k1rc7sly.fsf@gmail.com> In-Reply-To: <87k1rc7sly.fsf@gmail.com> --sZJnlp2isG5XXx23F1UTcLcFwCaBYBcaD Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable On 2018-06-05 18:53, Noam Postavsky wrote: > Both SBCL and CLisp throw an error for (let ((x 1) (y nil)) (incf x y))= , > although I can't see anything in the Common Lisp spec to decide either > way. E.g., cltl2 says: >=20 > If delta is not supplied, then the number in place is changed by 1.= >=20 > https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node125.html Thanks for looking up the spec and testing other implementations. I'm no= t sure what to make of the result with SBCL and CLisp, since (incf x nil)= also fails in both of them (whereas it works for us, since we can't dist= inguish nil and unspecified). >> In the rest of Emacs there are lots of other examples. Many of them >> (for example semantic-find-tags-by-name or calendar-increment-month) >> seem to work when passed a nil-valued variable, but many others behave= >> like cl-incf (for example gnus-summary-article-score). >=20 > I don't think those are great examples of macros to emulate. Agreed, I was just collecting other examples, both in support and against= my point. 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