From: Drew Adams <drew.adams@oracle.com>
To: Michael Heerdegen <michael_heerdegen@web.de>,
Emacs Development <emacs-devel@gnu.org>
Subject: RE: defvar without value
Date: Tue, 31 Mar 2020 17:36:36 -0700 (PDT) [thread overview]
Message-ID: <37aee3f6-e95f-471d-b565-79022ab8980b@default> (raw)
In-Reply-To: <87k1302htp.fsf@web.de>
> Using `defvar' (on top-level) without specifying a value differs in two
> ways from calls that specify a value: (1) the variable's value is not
> set, and (2) the variable is made special only in the context of the
> (rest of the) current file or buffer.
>
> I wonder if it is good that these two things are chained together, and
> if there are alternatives to what we have now. Latest changes have
> revealed that in some cases, people wanted (1) to always get compiler
> warnings when a variable is not explicitly bound, but they didn't
> intend
> that the variable is not always special. Dunno to how many people this
> happened, but it is a kind of pitfall.
I've thought the same thing. I don't see a logical connection. If that's right then linking them is a bit ugly.
For one thing, it seems wrong that the only way to proclaim that a variable is to special globally is to give it a defvar default value.
next prev parent reply other threads:[~2020-04-01 0:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 0:03 defvar without value Michael Heerdegen
2020-04-01 0:36 ` Drew Adams [this message]
2020-04-01 0:59 ` Stefan Monnier
2020-04-01 22:45 ` Michael Heerdegen
2020-04-02 2:37 ` Stefan Monnier
2020-04-09 1:52 ` Michael Heerdegen
2020-04-09 2:04 ` Emanuel Berg via Emacs development discussions.
2020-04-09 2:20 ` Stefan Monnier
2020-04-09 23:34 ` Emanuel Berg via Emacs development discussions.
2020-04-10 15:20 ` Bruno Félix Rezende Ribeiro
2020-04-10 23:07 ` Emanuel Berg via Emacs development discussions.
2020-04-10 21:57 ` Michael Heerdegen
2020-04-01 1:21 ` Noam Postavsky
2020-04-01 1:53 ` Michael Heerdegen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=37aee3f6-e95f-471d-b565-79022ab8980b@default \
--to=drew.adams@oracle.com \
--cc=emacs-devel@gnu.org \
--cc=michael_heerdegen@web.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).