On Wed, Sep 21, 2022 at 9:24 AM Philip Kaludercic <philipk@posteo.net>
wrote:

> Perhaps, when it comes to this, it might be enough to add a legacy alias
> and make `linum-mode' invoke `display-line-numbers-mode', doing the same
> for `global-linum-mode' and `global-display-line-numbers-mode'.
>
> A more general idea might be to have some kind of init.el-health-checker
> command that could detect and propose to fix simple issues like these.
> But then again, will those who never pay attention notice this?
>

Perhaps a variant of the disabled-command machinery for replaced
functionality? Something like:

 (put 'linum-mode 'replaced "This library was made obsolete in Emacs 29.1.
We recommend...")

If this need doesn't deserve a generalized approach, it looks like a
one-off for linum based on #'command-query could work.

Hope this helps,
~Chad