From: Daniel Colascione <dancol@dancol.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "Stephen J. Turnbull" <stephen@xemacs.org>,
Daniel Hackney <dan@haxney.org>,
Drew Adams <drew.adams@oracle.com>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: Lexical byte-compilation warnings cleanup
Date: Sun, 15 Sep 2013 12:33:35 -0700 [thread overview]
Message-ID: <52360B8F.10904@dancol.org> (raw)
In-Reply-To: <jwvli3vmzj5.fsf-monnier+emacs@gnu.org>
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On 8/20/13 9:49 PM, Stefan Monnier wrote:
>>>> And the intention is? The design is? The reason is?
>
> Check the calling convention used by the new byte-code representation
> (used for lexically scoped code) and you'll see that there's no support
> for dynamic scoping in it. Adding such support "natively" would
> slow down the common case too much.
I think the current design is reasonable, and the byte-compiler warning
provides some safety. We do, however, need to provide some warnings in
cl-lib, because in some cases, we _can_ dynamically bind arguments.
Consider this code:
(defvar test (cons 1 2))
(defun* bar3 () (car test))
(defun* bar2 (&key test) (bar3))
(defun* bar1 () (bar2 :test (cons 3 4)))
When bar2 parses its argument list, is _dynamically_ binds test, which
test then picks up. bar1 returns 3. If we change test from a keyword
argument to a regular argument, bar1 then returns 1, as expected.
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next prev parent reply other threads:[~2013-09-15 19:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 23:33 Lexical byte-compilation warnings cleanup Daniel Hackney
2013-08-20 0:01 ` Juanma Barranquero
2013-08-20 0:11 ` Glenn Morris
2013-08-20 5:47 ` Stefan Monnier
2013-08-20 15:25 ` Drew Adams
2013-08-20 20:41 ` Stefan Monnier
2013-08-20 21:31 ` Drew Adams
2013-08-20 23:21 ` Stefan Monnier
2013-08-21 0:10 ` Drew Adams
2013-08-21 1:53 ` Stephen J. Turnbull
2013-08-21 2:57 ` Drew Adams
2013-08-21 4:49 ` Stefan Monnier
2013-09-04 20:50 ` Daniel Hackney
2013-09-15 19:33 ` Daniel Colascione [this message]
2013-08-21 5:19 ` Dmitri Paduchikh
2013-08-21 20:12 ` Stefan Monnier
2013-09-05 3:30 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2013-08-21 23:12 Barry OReilly
2013-08-22 5:05 ` Dmitri Paduchikh
2013-08-22 20:41 ` Stefan Monnier
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