Issue #17387 has been reported by jnchito (Junichi Ito).

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Bug #17387: About Warning.warn compatibility in Ruby 3.0.0
https://bugs.ruby-lang.org/issues/17387

* 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
----------------------------------------
The sample code in https://docs.ruby-lang.org/ja/latest/method/Warning/s/warn.html does not work in Ruby 3.0.0. Is it intended behavior? I'm worrying about its compatibility.

``` ruby
warn "hoge"

module Warning
  def self.warn(*message)
    super(*message.map { |msg| msg.chomp + "!!!\n" })
  end
end

warn "hoge"
```

```
$ ruby ~/Desktop/test.rb
hoge
/Users/jnito/Desktop/test.rb:5:in `block in warn': undefined method `chomp' for {:category=>nil}:Hash (NoMethodError)
	from /Users/jnito/Desktop/test.rb:5:in `map'
	from /Users/jnito/Desktop/test.rb:5:in `warn'
	from <internal:warning>:43:in `warn'
	from /Users/jnito/Desktop/test.rb:9:in `<main>'
```

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




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