From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Alan Mackenzie <acm@muc.de>
Cc: emacs-devel@gnu.org
Subject: Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical.
Date: Tue, 03 Jan 2017 16:48:15 -0500 [thread overview]
Message-ID: <jwv1swj4yao.fsf-monnier+Inbox@gnu.org> (raw)
In-Reply-To: <20170103213228.GB2085@acm.fritz.box> (Alan Mackenzie's message of "Tue, 3 Jan 2017 21:32:28 +0000")
> It looks like you've already done that, possibly on 2015-10-29. Looking
> at the source (now I know what to look for), eval-sexp-add-defvars is
> also in Emacs 25.1's source for compile-defun.
Oh, indeed. Not sure why you're seeing what you're seeing, then.
At least on Emacs's master branch I can't seem to reproduce your problem
(don't have a fresh emacs-25 build to try it right now).
> , so the question becomes why is setting the declared_special flag done
> inside the "if (CONSP (tail))" rather than outside? I.e. why is it only
> done when a variable has an initialisation?
Because this code is only relevant when you evaluate (defvar <foo>),
whereas here we're not evaluating it, we're only processing it for the
byte-compiler.
There's also the important difference that a (defvar <foo>) only
has effect for the code in the same file rather than having a global
effect, so you can do (defvar toto) and then use `toto` as
a dynamically-scoped variable in your file without wreaking havoc in all
other files which happen to also use `toto` as a (lexical) variable.
Stefan
next prev parent reply other threads:[~2017-01-03 21:48 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 [this message]
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
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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