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#!/usr/bin/env ruby -w

module Mixin
  def method_missing(meth, *args, &block)
    if meth.to_s =~ /\Ato_.+/
      "Mixin"
    else
      super
    end
  end
end

class Test
  include Mixin
  def method_missing(meth, *args, &block)
    if meth.to_s =~ /\Ato_class_.+/
      "Class"
    else
      super
    end
  end
end

t = Test.new
t.to_class_html  # => "Class"
t.to_html        # => "Mixin"