From: Jason Lillywhite <jason.lillywhite@...>
Date: 2009-08-13T04:57:59+09:00
Subject: Re: Class#descendants?

Robert Klemme wrote:

> ObjectSpace.each_object(Class) do |cl|
>    cl.superclass.ancestors.each {|scl| h[scl] << cl}
> end

I'm getting this error:

irb(main):085:0> ObjectSpace.each_object(Class) do |cl|
irb(main):086:1*    cl.superclass.ancestors.each {|scl| h[scl] << cl}
irb(main):087:1> end
NoMethodError: undefined method `ancestors' for nil:NilClass
        from (irb):86
        from (irb):85:in `each_object'
        from (irb):85
        from :0

Is there a reason superclass is returning nil on cl?
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