class Module
  # Modifies attr_writer to return an array
  # of the names of the methods it has defined.
  def attr_writer(*args)
    made = []
    args.each { |a|
      a = a.to_s.strip.chomp('=')
      module_eval %Q{ def #{a}=(x); @#{a} = x ; end }
      made << "#{a}=".to_sym
    }
    return *made
  end
end