[ruby-core:118286] [Ruby master Bug#20573] Warning.warn shouldn't be called for disabled warnings

Issue #20573 has been updated by byroot (Jean Boussier).


In [Feature #16345] it was stated:

> We chose Warning.disable(:deprecated) instead of
re-defining Warning.warn in order to avoid string object generation.

The intent was clearly for `Warning.warn` not to be called.

----------------------------------------
Bug #20573: Warning.warn shouldn't be called for disabled warnings
https://bugs.ruby-lang.org/issues/20573#change-108787

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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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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