From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Lexical binding and macros.
Date: Thu, 16 Dec 2010 16:59:59 -0500 [thread overview]
Message-ID: <jwv39pxz8fl.fsf-monnier+gnu.emacs.help@gnu.org> (raw)
In-Reply-To: 87vd2v8107.fsf@lola.goethe.zz
>> Additionally to what Pascal already explained, I'll add that,
>> lexical-let, like `loop' are relatively heavy macros, so you
>> definitely don't want to run them interpreted (where the macro is
>> re-expanded each time).
> Why would they be reexpanded each time?
Because it's easier to implement it that way in a pure interpreter.
> They are macros. Their expansion is done once and merely evalled
> each time.
> Or do I misunderstand something here?
Their expansion *can be* done once (which is what happens when you
byte-compile), but the interpreter doesn't bother with
such optimizations.
Stefan
next prev parent reply other threads:[~2010-12-16 21:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.40.1292017369.4804.help-gnu-emacs@gnu.org>
2010-12-12 4:10 ` Lexical binding and macros Barry Margolin
2010-12-12 17:14 ` LanX
2010-12-12 17:23 ` Pascal J. Bourguignon
2010-12-15 4:24 ` Stefan Monnier
2010-12-15 9:15 ` Elena
2010-12-15 12:38 ` Pascal J. Bourguignon
2010-12-15 15:40 ` Stefan Monnier
2010-12-15 16:16 ` David Kastrup
2010-12-15 17:37 ` Pascal J. Bourguignon
2010-12-15 17:54 ` Elena
2010-12-16 21:59 ` Stefan Monnier [this message]
2010-12-10 21:42 Alin Soare
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