From: Stefan Kangas <firstname.lastname@example.org> To: Neil Jerram <email@example.com> Cc: Org-mode <firstname.lastname@example.org> Subject: Re: [PATCH] Remove redundant 'function's around lambda Date: Thu, 19 Nov 2020 06:51:01 -0800 [thread overview] Message-ID: <CADwFkmn_bH0k+f50ST8cv1M4azsNmKdvXjbsDS2uHHAqmi-RFg@mail.gmail.com> (raw) In-Reply-To: <CAKuG=vufnWctEh133-OQdUBMOtcz6dH+Nny=1ENCW4YPLoz=Tg@mail.gmail.com> Neil Jerram <email@example.com> writes: >> I've been working on removing redundant `function' around `lambda' in >> Emacs core, > > I'm slightly curious about the history and reasoning around this. If I > understand correctly, (lambda ...) on its own has always worked, and it's > never been strictly necessary to add (quote ...) or (function ...) around > it. Then sometime (Emacs 19 or later, I think) it started being > recommended to use (function ...). > > Do you know why that recommendation started, and should I understand that > the reasoning for it has now evaporated? Correct, there is no reason to do this. I don't know the history here, and there are people on emacs-devel that would know better. I _suspect_ that the byte-compiler first got the capability to optimize calls to anonymous functions, but that it required to explicitly marked as such with `function'. Later, it grew the capability to recognize lambda as such automatically. But I don't know if that is correct; it's just a guess. In any case, they are no longer needed as lambda and lambda+function are equivalent. (Note that the worst thing here is to do `(quote (lambda ...))' as that defeats byte-compiler optimizations altogether.)
next prev parent reply other threads:[~2020-11-19 14:52 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-17 16:55 Stefan Kangas 2020-11-19 3:07 ` Kyle Meyer 2020-11-19 3:44 ` Stefan Kangas 2020-12-14 6:49 ` Bastien 2020-12-23 5:11 ` Kyle Meyer 2020-11-19 10:44 ` Neil Jerram 2020-11-19 14:51 ` Stefan Kangas [this message] 2020-11-19 15:16 ` Neil Jerram
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