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module World 
end 
module World2 
end 

class Hello 
  include World 
  extend World2 
  def meta 
    class << self 
      self 
    end 
  end 
end 

h = Hello.new 
h.extend World2 
puts h.meta.included_modules.inspect 
puts Hello.included_modules.inspect

[World2, World, Kernel]
[World, Kernel]