gistfile1.rb

class TwoListener
  def success(one, two)
    puts "#{one}, #{two}"
  end
end

def sender(listener, *args)
  listener.send(:success, *args)
end

def two_params
  return "x", "y"
end

tl = TwoListener.new
sender(tl, two_params)
ArgumentError: wrong number of arguments (1 for 2)