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/usr/lib/ruby/vendor_ruby/treetop/compiler/node_classes/parenthesized_expression.rb is in ruby-treetop 1.4.10-5.

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module Treetop
  module Compiler    
    class ParenthesizedExpression < ParsingExpression
      def compile(address, builder, parent_expression = nil)
        elements[2].compile(address, builder, parent_expression)
      end
    end
  end
end