    # File lib/core/facets/module/is.rb, line 25
      def is(*mods)
        mods.each do |mod|
          if mod.const_defined?(:Self)
            extend mod::Self
            # pass it along if module
            if instance_of?(Module)
              const_set(:Self, Module.new) unless const_defined?(:Self)
              const_get(:Self).send(:include, mod::Self)
            end
          end
        end
        include(*mods)
      end