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boundary="CGpqY0GUbnSrTc7TvrPAO0WHeHrmvY5XA"; protected-headers="v1" From: =?UTF-8?Q?Cl=c3=a9ment_Pit-Claudel?= To: Noam Postavsky , Michael Heerdegen Cc: 31715@debbugs.gnu.org Message-ID: 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> In-Reply-To: <871sdm851q.fsf@gmail.com> --CGpqY0GUbnSrTc7TvrPAO0WHeHrmvY5XA Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable On 2018-06-04 20:12, Noam Postavsky wrote: > I couldn't find any other cases of optional parameters in core macros. I'm not sure which macros count as core macros. In cl-lib itself there's= cl-assert, which seems to behave the same as cl-incf. 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-in= cf (for example gnus-summary-article-score). 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