GNU bug report logs - #5950
defvaralias after defvar should be warned in runtime

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Package: emacs;

Reported by: irieshinsuke <at> yahoo.co.jp

Date: Thu, 15 Apr 2010 05:15:02 UTC

Severity: normal

Tags: fixed, patch

Fixed in version 27.1

Done: Noam Postavsky <npostavs <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Noam Postavsky <npostavs <at> gmail.com>
To: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
Cc: 5950 <at> debbugs.gnu.org, IRIE Shinsuke <irieshinsuke <at> yahoo.co.jp>, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#5950: defvaralias after defvar should be warned in runtime
Date: Thu, 2 Aug 2018 09:28:51 -0400

On 2 August 2018 at 09:08, Clément Pit-Claudel <cpitclaudel <at> gmail.com> wrote:

>> Usually the warning is due to the defvaralias call being performed after
>> the corresponding `defvar`s.
>
> Right. But why is that a problem?

The typical failure case goes like this, user does this:

(setq the-package-setting 'foo)
(require 'the-package)

And the-package.el does this:

(defvar the-package-real-setting 'bar)
;; Oops! User's setting of `foo' is overwritten here:
(defvaralias 'the-package-setting 'the-package-real-setting)

See Bug#31603 for a real life example.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31603
This bug report was last modified 6 years and 298 days ago.

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