kik@gentoo ~ $ irb
irb(main):001:0> class Prout
irb(main):002:1>   attr_accessor :var
irb(main):003:1>   @@var = 5
irb(main):004:1>   def initialize
irb(main):005:2>     puts "prout"
irb(main):006:2>     end
irb(main):007:1>   end
  =>nil
irb(main):008:0> Prout.var
NoMethodError: undefined method `var' for Prout:Class
        from (irb):8
        from :0
irb(main):009:0>