ghost class

gistfile1.txt

irb(main):001:0> class Foo
irb(main):002:1> def ghost_class
irb(main):003:2> class << self
irb(main):004:3> self
irb(main):005:3> end
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> bar = Foo.new
=> #<Foo:0x871f4>
irb(main):009:0> bar.ghost_class
=> #<Class:#<Foo:0x871f4>>