From: Stefan Kangas <email@example.com>
To: Neil Jerram <firstname.lastname@example.org>
Cc: Org-mode <email@example.com>
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)
Neil Jerram <firstname.lastname@example.org> 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 [PATCH] Remove redundant 'function's around lambda 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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