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/usr/lib/ruby/vendor_ruby/nokogiri/html/entity_lookup.rb is in ruby-nokogiri 1.6.7.2-3build1.

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module Nokogiri
  module HTML
    class EntityDescription < Struct.new(:value, :name, :description); end

    class EntityLookup
      ###
      # Look up entity with +name+
      def [] name
        (val = get(name)) && val.value
      end
    end
  end
end