[ruby-core:118414] [Ruby master Bug#20573] Warning.warn shouldn't be called for disabled warnings

Issue #20573 has been updated by Eregon (Benoit Daloze).


As a small note on this, it's typically better to check `$VERBOSE` level and if the category is enabled before even generating/formatting the message String, for performance reasons.
So if that's always done the check in Warning.warn would be basically redundant.
But I agree it makes sense conceptually to check and also in some cases where e.g. the message String is static + frozen and then there is no cost for that message String.

----------------------------------------
Bug #20573: Warning.warn shouldn't be called for disabled warnings
https://bugs.ruby-lang.org/issues/20573#change-108930

* Author: tenderlovemaking (Aaron Patterson)
* Status: Closed
* Backport: 3.1: WONTFIX, 3.2: REQUIRED, 3.3: REQUIRED
----------------------------------------
Currently `Warning.warn` will be called for all warnings, even if that particular category is disabled.

For example

```ruby
module Warning
  def warn(message, category:)
    p message => category
  end
end

def get_var
  $=
end

p Warning[:deprecated]
get_var
```

I think that internally we should _not_ call `Warning.warn` unless the category is enabled.

I've sent a PR here: https://github.com/ruby/ruby/pull/10960



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