Ruby 3.4.0 no longer includes "abbrev" and it suggests zeitwerk to include it

[everton]

Ruby 3.3.0 is presenting this warning while loading a Rails application:

abbrev was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. 
Add abbrev to your Gemfile or gemspec.

Also **contact author of zeitwerk-2.6.13 to add abbrev into its gemspec.**

The lib is now available as a gem maintained by Ruby team: https://github.com/ruby/abbrev

But I can't see any direct usage of the lib inside the project, so I think this is caused by dependencies loaded through zeitwerk, which leads to another problem (if this is the case): how can I tell what exactly is causing this?

I opened this issue here cause I don't know how I can find where is the proper repo to open it, feel free to close it, of course, but it would be great if:

1. you contact Ruby team to present a better warning in this case, if this is possible, of course
2. suggest how can one know what is causing this deprecation, if it is not your gem directly

Thanks!

[everton]

debugging the callers for the abbrev inside the gem, I was able to find the cause in my case; it was the Highline gem, and they are already looking for this issue:

JEG2/highline#270

I will not close the issue here now because I am still curious: is there any way that Ruby or Zeitwerk could improve this warning to point to the gem causing the warning? I mean, probably other similar cases will happen with other gems, and it seems interesting to know what the cause is without the need to debug from inside Zeitwerk code, but I really don't know if Ruby has the resources to instrument this.

[fxn]

Hi @everton.

Indeed, this is the 5th issue that is opened for the same reason.

Zeitwerk decorates Kernel#require and Ruby issues a warning that basically assumes nobody is decorating that method. But this assumption is incorrect, since a few gems do, and Ruby modules are open by design anyway.

We are discussing here ruby/ruby#10244.