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# normal thread.rb Queue
q = Queue.new
wr = nil
 
# use block to ensure the reference goes away
tap do
obj = Object.new
wr = WeakRef.new(obj, q)
 
# reference is live at this point
puts wr.__getobj__
# queue is empty at this point
puts q.pop(true) rescue puts 'nothing in queue'
end
 
# run GC, presumably triggering finalizer insert into queue
GC.start
 
# reference is dead at this point
puts wr.__getobj__ rescue nil
 
# queue now contains the weakref object
puts q.pop(true).class
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