From: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: snogglethorpe@gmail.com, emacs-devel@gnu.org,
emacs-w3m@namazu.org, miles@gnu.org
Subject: Re: bogus change(s) in cl-macs.el
Date: Fri, 19 Nov 2004 02:10:55 -0500 [thread overview]
Message-ID: <87d5yajs0c.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <b9yfz36o01w.fsf@jpl.org> (Katsumi Yamaoka's message of "Fri, 19 Nov 2004 14:55:07 +0900")
> I found the simplest way to explain the bug:
> (macroexpand
> '(labels ((FOO nil FOO-BODY)
> (BAR nil BAR-BODY))
> (FOO)
> (BAR)))
> (let ((--cl---cl-var---- nil)
> (--cl---cl-var---- nil))
> (progn
> (progn
> (set '--cl---cl-var---- #'(lambda nil BAR-BODY))
> (set '--cl---cl-var---- #'(lambda nil FOO-BODY)))
> (funcall (symbol-value '--cl---cl-var----))
> (funcall (symbol-value '--cl---cl-var----))))
> One of two functions FOO and BAR is disregarded as you see.
Well, actually we can't see it here because you haven't used print-gensym
to distinguish symbols with the same name. But indeed:
(labels ((foo nil 1) (bar nil 2)) (cons (foo) (bar)))
returns (1 . 1). This is because cl's macro environment uses symbol names
rather than symbols for symbol-macros, so if two symbols have the same name
(i.e. `eq', not just `equal') and they both are symbol-macros, then
CL screws up. I'm working on a patch for that.
Stefan
PS: A symbol-macro is a macro `foo' that is not triggered by (foo bla bla)
but by a mere `foo'.
E.g. (symbol-macrolet ((x (hello))) (+ x 1)) => (+ (hello 1))
next prev parent reply other threads:[~2004-11-19 7:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-19 3:06 bogus change(s) in cl-macs.el Katsumi Yamaoka
2004-11-19 3:41 ` Luc Teirlinck
2004-11-19 3:51 ` Miles Bader
2004-11-19 4:21 ` Luc Teirlinck
2004-11-19 3:48 ` Miles Bader
2004-11-19 3:59 ` Katsumi Yamaoka
2004-11-19 5:55 ` [emacs-w3m:07185] " Katsumi Yamaoka
2004-11-19 7:10 ` Stefan Monnier [this message]
2004-11-19 20:04 ` Richard Stallman
2004-11-26 2:17 ` Katsumi Yamaoka
2004-11-26 4:03 ` Stefan Monnier
2004-11-26 5:18 ` Katsumi Yamaoka
2004-11-26 23:51 ` Stefan Monnier
2004-11-19 5:40 ` Stefan Monnier
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