From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical.
Date: Wed, 4 Jan 2017 22:02:43 +0000 [thread overview]
Message-ID: <20170104220243.GC2052@acm.fritz.box> (raw)
In-Reply-To: <jwv37gy4hx4.fsf-monnier+gmane.emacs.devel@gnu.org>
Hello, Stefan.
On Wed, Jan 04, 2017 at 04:49:15PM -0500, Stefan Monnier wrote:
> > special-variable-p would appear to be a near useless function, since it
> > doesn't do what it's name says.
> It's useful for the compiler, but it's mostly internal, indeed.
OK.
> > There appears to be no way of checking whether a variable's binding is
> > (or will be) lexical.
> In which context do you need/want to do that (I ask because how to do
> it (and even if it can be done) depends on the details)?
I honestly don't know. I presume that there will be code (other than
the byte compiler) which will want to make a distinction. Maybe there's
not. After (defvar foo), the byte compiler seems able to handle foo as
a dynamic variable. I'm still trying to figure out how, given that that
flag denoting a special variable in the struct symbol doesn't get set.
I'm just thoroughly confused about the whole business of whether (defvar
foo) creates a special variable or not. At the moment, I'm not even
quite sure any more exactly what a special variable is. I knew this
morning. :-(
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2017-01-04 22:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-03 14:14 Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical Alan Mackenzie
2017-01-03 18:35 ` Stefan Monnier
2017-01-03 21:32 ` Alan Mackenzie
2017-01-03 21:48 ` Stefan Monnier
2017-01-04 13:39 ` Alan Mackenzie
2017-01-04 15:23 ` Stefan Monnier
2017-01-04 20:04 ` Alan Mackenzie
2017-01-04 21:49 ` Stefan Monnier
2017-01-04 22:02 ` Alan Mackenzie [this message]
2017-01-04 22:26 ` Stefan Monnier
2017-01-04 22:44 ` Drew Adams
2017-01-05 10:54 ` Alan Mackenzie
2020-02-13 16:42 ` Drew Adams
2020-02-13 20:02 ` Stefan Monnier
2020-02-13 20:43 ` Drew Adams
2020-02-13 22:09 ` Stefan Monnier
2020-02-14 1:07 ` Drew Adams
2020-02-14 2:24 ` Stefan Monnier
2020-02-14 17:25 ` Drew Adams
2020-02-14 19:19 ` Stefan Monnier
2020-02-17 18:23 ` Drew Adams
2020-02-13 22:11 ` Stefan Monnier
2020-02-14 1:13 ` Drew Adams
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