File: classes.rb

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require 'weakref'

# From MRI test_weakref.rb
class WeakRefSpec
  def self.make_weakref(level = 10)
    if level > 0
      make_weakref(level - 1)
    else
      WeakRef.new(Object.new)
    end
  end

  def self.make_dead_weakref
    weaks = []
    weak = nil
    1000.times do
      weaks << make_weakref
    end

    1000.times do
      GC.start
      break if weak = weaks.find { |w| !w.weakref_alive? }
    end
    weak
  end
end