[ruby-dev:37045] super dynamic class definition causes infinite loop

須藤です。

以下のスクリプトの2回目のdefined_class.newで無限ループになっ
てしまいます。

---
def define_class(parent=nil)
  Class.new(parent || Object) do
    def initialize
      super
    end
  end
end

defined_class = define_class
p defined_class.new

define_class(defined_class)
p defined_class.new
---

% /tmp/local/bin/ruby -v /tmp/a.rb
ruby 1.9.0 (2008-11-09 revision 20163) [x86_64-linux]
#<#<Class:0x00000000ef6c30>:0x00000000ef6640>
/tmp/a.rb:4:in `initialize': stack level too deep (SystemStackError)
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	 ... 8716 levels...
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:4:in `initialize'
	from /tmp/a.rb:13:in `new'
	from /tmp/a.rb:13:in `<main>'