search_dir(dir, &callback) private

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# File activesupport/lib/active_support/cache/file_store.rb, line 197
        def search_dir(dir, &callback)
          return if !File.exist?(dir)
          Dir.each_child(dir) do |d|
            name = File.join(dir, d)
            if File.directory?(name)
              search_dir(name, &callback)
            else
              callback.call name
            end
          end
        end
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