octype error of NSZone

[psychs@…]

framework 'Cocoa'

class MyCell < NSCell
  def copyWithZone(zone)
    MyCell.new
  end
end

NSApplicationMain(0, nil)

It should work well, but I got an error below.

test.rb:4:in `<class:MyCell>': unrecognized octype `{_NSZone=}' (RuntimeError)
	from test.rb:3:in `<main>'

[lsansonetti@…]

Fixed in r300/trunk.