# File lib/treetop/compiler/metagrammar.rb, line 641
      def _nt_declaration
        start_index = index
        if node_cache[:declaration].has_key?(index)
          cached = node_cache[:declaration][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0 = index
        r1 = _nt_parsing_rule
        if r1
          r0 = r1
        else
          r2 = _nt_include_declaration
          if r2
            r0 = r2
          else
            self.index = i0
            r0 = nil
          end
        end

        node_cache[:declaration][start_index] = r0

        return r0
      end