From: me@...
Date: 2020-12-12T11:08:58+00:00
Subject: [ruby-core:101427] [Ruby master Bug#17388] Doesn't Warning.warn support `category: :experimental` in Ruby 3.0.0?

Issue #17388 has been reported by jnchito (Junichi Ito).

----------------------------------------
Bug #17388: Doesn't  Warning.warn support `category: :experimental` in Ruby 3.0.0?
https://bugs.ruby-lang.org/issues/17388

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0preview2 (2020-12-08 master d7a16670c3) [x86_64-darwin20]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
I wrote the following script:

```ruby
module Warning
  def self.warn(message, category: nil)
    puts "category=#{category}"
    super
  end
end
lambda(&:foo).lambda?
Ractor.new{}
```

Then, run it:

```
$ ruby -w ~/Desktop/test.rb
category=deprecated
/Users/jnito/Desktop/test.rb:7: warning: lambda without a literal block is deprecated; use the proc without lambda instead
category=
<internal:ractor>:38: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
```

I got `category=deprecated` as I expected, but got `nil` instead of `:experimental`. I feel it should be `:experimental`.

This issue is related to https://bugs.ruby-lang.org/issues/17122




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