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path: root/jni/ruby/sample/weakref.rb
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require 'weakref'

foo = Object.new
p foo.to_s                    # original's class
foo = WeakRef.new(foo)
p foo.to_s                    # should be same class
ObjectSpace.garbage_collect
ObjectSpace.garbage_collect
p foo.to_s                    # should raise exception (recycled)