Issue #13115 has been reported by Fumiaki Matsushima.

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Bug #13115: `YAML.dump` outputs deperecated message even with delegated object
https://bugs.ruby-lang.org/issues/13115

* Author: Fumiaki Matsushima
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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`YAML.dump` outputs deprecated message if it calls with delegated object
but doesn't with inherited object:

~~~ ruby
require 'yaml'
require 'delegate'

$VERBOSE = true
class Delegated < DelegateClass(Object)
  def initialize
    super(Object.new)
  end
end

puts 'YAML.dump(Delegated.new)'
YAML.dump(Delegated.new)

class Inherited < Object
end
puts 'YAML.dump(Inherited.new)'
YAML.dump(Inherited.new)

# $ ruby test.rb
# YAML.dump(Delegated.new)
# implementing to_yaml is deprecated, please implement "encode_with"
# YAML.dump(Inherited.new)
~~~

Is this intentional?



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