# File lib/rouge/lexers/vhdl.rb, line 26
      def self.keywords_type
        @keywords_type ||= Set.new %w(
        bit bit_vector boolean boolean_vector character integer integer_vector natural positive
        real real_vector severity_level signed std_logic std_logic_vector std_ulogic
        std_ulogic_vector string unsigned time time__vector
        )
      end