From: "Dan0042 (Daniel DeLorme)" <noreply@...>
Date: 2022-07-30T01:45:10+00:00
Subject: [ruby-core:109379] [Ruby master Feature#18930] Officially deprecate class variables

Issue #18930 has been updated by Dan0042 (Daniel DeLorme).


I am 100% opposed to deprecation. I use class variables regularly. As long as you initialize them in the class definition, there is no issue with shadowing. They're inherited in subclasses. They work perfectly fine.

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Feature #18930: Officially deprecate class variables
https://bugs.ruby-lang.org/issues/18930#change-98529

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
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Ruby's class variables are very confusing, and it seem many people agree they should be avoided (#18927).

How about we deprecate them officially?

Concretely:
* Mention in the documentation that class variables are deprecated and should be avoided/should not be used.
* Add a parse-time deprecation warning, now that we only see those with `Warning[:deprecation] = true` it seems reasonable to add.



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