From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Felician Nemeth Newsgroups: gmane.emacs.devel Subject: Re: (byte-compile '(append '(1 2) '(3 4))) Date: Sat, 16 Mar 2024 14:45:24 +0100 Message-ID: <87a5mythmz.fsf@betli.tmit.bme.hu> References: <87v8j28c2x.fsf@betli.tmit.bme.hu> <874jdipfp5.fsf@posteo.net> <87cys6t734.fsf@betli.tmit.bme.hu> <87r0gmnjq4.fsf@posteo.net> <87o7bprr04.fsf@betli.tmit.bme.hu> <87bk7p57yz.fsf@posteo.net> <87r0gatlqz.fsf_-_@betli.tmit.bme.hu> <87cyrubazs.fsf@posteo.net> <87wmq2nweb.fsf@epfl.ch> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32287"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) Cc: Philip Kaludercic , emacs-devel@gnu.org To: "Basil L. 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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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:317112 Archived-At: > According to its docstring, append's last argument must be eq to the > tail of its return value. So that is why the compiler does optimize out (append '(1 2) '(3 4)) in (disassemble (byte-compile '(append (append '(1 2) '(3 4)) '(5 6)))) , but does not optimize the same expression out in (disassemble (byte-compile '(append (append '(1 2) '(3 4))))) ?