class EcoRake
  module Sample
    module Concern
      module Base
        class << self
          def included(base)
            super(base)
            base.extend ClassMethods
          end
        end

        module ClassMethods
          def included(base)
            super(base)
            base.extend self::ClassMethods if defined?(self::ClassMethods)
          end
        end
      end
    end
  end
end