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/usr/lib/ruby/vendor_ruby/specinfra/ext/class.rb is in ruby-specinfra 2.66.0-1.

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class Class
  def subclasses
    result = []
    ObjectSpace.each_object(Class) do |k|
      next unless k < self
      next if k.respond_to?(:singleton_class?) && k.singleton_class?
      result << k
    end
    result
  end
end