module Logger
  extend self
  attr_accessor :output
 	
  def log(&event)
    self.output ||= []
    event.call(output)
  end
 	
 	
  def play
    puts output.join("\n")
  end
end
 	
 	
class Thing
  def initialize(id)
    Logger.log { |output| output << "created thing #{id}" }
  end
end
 	
 	
def do_something
  1000.times { |i| Thing.new(i) }
end
 	
 	
do_something
 	
GC.start
 	
Logger.play
 	
puts ObjectSpace.each_object(Thing).count