# File lib/rouge/lexers/sieve.rb, line 19
      def self.actions
        @actions ||= Set.new(
          # action commands (rfc5228 ยง 2.9)
          %w(keep fileinto redirect discard) +
          # Editheader Extension (rfc5293)
          %w(addheader deleteheader) +
          # Reject and Extended Reject Extensions (rfc5429)
          %w(reject ereject) +
          # Extension for Notifications (rfc5435)
          %w(notify) +
          # Imap4flags Extension (rfc5232)
          %w(setflag addflag removeflag) +
          # Vacation Extension (rfc5230)
          %w(vacation) +
          # MIME Part Tests, Iteration, Extraction, Replacement, and Enclosure (rfc5703)
          %w(replace enclose extracttext)
        )
      end