Class variables

ruby-talk
1

I know the rules for class variables have changed in 1.9, but I am not
understanding this behaviour (this works ok in 1.8.x):

module M
  def self.included(klass)
    klass.class_eval("@@y = 22")
    class <<klass
      @@x = 33
    end
  end
end

=> nil

?> class B

  include M
  def show
    p @@y
    p @@x
  end
end

=> nil

?> B.new.show
22
NameError: uninitialized class variable @@x in B
from (irb):14:in `show'
from (irb):18
$ ruby -v
ruby 1.9.0 (2004-07-29) [i686-linux]

Stephen

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