gistfile1.rb

module Thing
  module Constants
    BOO = 2
  end

  module Methods
    extend ActiveSupport::Concern
    include Constants

    module InstanceMethods
      def boo
        BOO
      end
    end
  end

  class Includify
    include Methods
  end
end


Thing::Includify.new.boo #=> unitialize Constant Thing::InstanceMethods::BOO
Thing::Methods.constants #=> [:InstanceMethods, :BOO]

module Thing
  module Methods
    extend ActiveSupport::Concern
    BOO = 2

    module InstanceMethods
      def boo
        BOO
      end
    end
  end

  class Includify
    include Methods
  end
end

Thing::Includify.new.boo #=> 2
Thing::Methods.constants #=> [:BOO, :InstanceMethods]