Subject: bug#49631: 28.0.50; dired-hide-details-mode Probably introduced at or before Emacs version 24.4

From: Steve Purcell <[email-masked]>
Date: Wed, 29 Sep 2021 13:54:42 +0200

> On 29 Sep 2021, at 13:48, Stefan Kangas <[email-masked]> wrote:
> 
> (With copy to Steve Purcell.)
> 
> Steve Purcell has some code to do this, or at least parts of it, here:
> 
>    https://github.com/purcell/package-lint/tree/master/tools
> 
> It comes out to this:
> 
>    https://github.com/purcell/package-lint/blob/master/data/stdlib-changes
> 
> Perhaps Steve would be willing to contribute his work, or even help us
> integrate his tools into Emacs?

You’re very willing to integrate that code if it helps. It’s quite rough and ready, so not completely sure how useful it would be to you. You’ll see it relies on loading all features in all emacs versions, and then diffing the various sets of symbols. It works okay for package-lint’s purposes at least.