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: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 5950 <at> debbugs.gnu.org, IRIE Shinsuke <irieshinsuke <at> yahoo.co.jp>, Noam Postavsky <npostavs <at> gmail.com>
Subject: bug#5950: defvaralias after defvar should be warned in runtime
Date: Thu, 2 Aug 2018 23:33:39 -0400

On 2018-08-02 13:03, Stefan Monnier wrote:
>>> 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)
>>
>> Thanks.  Should the warning be disabled when both variables are
>> already `defvar'd, then?
> 
> Why?  Replace `setq` with `defvar` in the above scenario and you have
> the same problem.

Do you? I thought the problem was that you were overwriting a user setting… if you change the first setq into a defvar, where's the user setting that you're overwriting?
This bug report was last modified 6 years and 298 days ago.

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