title: How to write constant inside module?
body: <pre><code>module Test1
    module Test2
      def self.included(base)
        # Where can I declare constant ? How ?
        base.extend ClassMethods
        base.class_eval do
             # named scopes
        end
      end
    end
  end
  
  class abc
    include Test1::Test2
  end
  </code></pre>
  
  <p>Where can I declare constant ? How ?</p>