From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: michael_heerdegen@web.de
Cc: 11258@debbugs.gnu.org
Subject: bug#11258: 24.1.50; lexical binding inconsistencies
Date: Tue, 17 Apr 2012 13:58:32 -0400 [thread overview]
Message-ID: <jwvr4vm9rcz.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87vckzsaul.fsf@web.de> (Michael Heerdegen's message of "Mon, 16 Apr 2012 22:03:30 +0200")
> ; Test -*- lexical-binding: t -*-
[...]
> (defun test2 (arg)
> (interactive "i")
> ((lambda () arg)))
Yes, this is the inconsistency recently discovered in
emacs-lock-mode, indeed.
> That's strange - shouldn't the result always be nil? If not, this
> (surprising) behavior should be documented in the manual.
This is a bug in the handling of ((lambda ...) args) in lexical-binding:
the compiler treats it as (funcall #'(lambda () ...) args), whereas the
interpreter treats it as (funcall '(lambda () ...) args), so the
lambda's body is treated as lexically scoped when compiled but
dynamically scoped when interpreted.
I think the compiler is right, so the interpreter needs fixing. I'm not
completely sure it will be harmless, so it won't be fixed in 24.1.
Stefan
next prev parent reply other threads:[~2012-04-17 17:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-16 20:03 bug#11258: 24.1.50; lexical binding inconsistencies Michael Heerdegen
2012-04-17 17:58 ` Stefan Monnier [this message]
2012-04-18 1:03 ` Michael Heerdegen
2013-04-19 20:50 ` Michael Heerdegen
2013-08-28 18:28 ` Stefan Monnier
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