ObjectSpace.each_object unexpected results

I was running an example from page 176 of IronRuby Unleashed and I got
an
unexpected error.
I added a class definition for Human to make the example run. In MRI
1.9.1
the code works as expected.
Thanks for any insight, and I’m always willing to test patches.

         -Matt Closson-

C:\Program Files\IronRuby 0.9.5.0\bin\ir -profile -trace test.rb
test.rb:13:in `each_object’: each_object only supported for objects of
type
Class or Module (RuntimeError)
from test.rb:13

Exit code: 1

class Human
def initialize(first_name, last_name)
@first = first_name
@last = last_name
end

def introduce
puts “Hi, I’m #{@first} #{@last}”
end
end

john = Human.new(‘John’, ‘Doe’)
ObjectSpace.each_object(Human) {|x| x.introduce}


Results from MRI 1.9.1
Hi, I’m John D.

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