class PrototypeClass
  attr_reader :prototype

  def initialize (prototype)
    @prototype = prototype
  end

  def new (*definitions)
    new_class = Class.new(self.class)

    # With a modern Ruby you could use caller to find the
    # file and line, then pass it in to give better error reporting.
    for definition in definitions
      new_class.module_eval definition
    end

    return new_class.new(self)
  end

  def def (definition)
    # With a modern Ruby you could use caller to find the
    # file and line, then pass it in to give better error reporting.
    self.class.module_eval "def #{definition} end"
  end

  def include (*mod)
    self.class.module_eval "include #{mod,join ', '}"
  end
end

Prototype = PrototypeClass.new(nil)