# File lib/treetop/compiler/metagrammar.rb, line 1059
      def _nt_sequence
        start_index = index
        if node_cache[:sequence].has_key?(index)
          cached = node_cache[:sequence][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        r1 = _nt_labeled_sequence_primary
        s0 << r1
        if r1
          s2, i2 = [], index
          loop do
            i3, s3 = index, []
            r4 = _nt_space
            s3 << r4
            if r4
              r5 = _nt_labeled_sequence_primary
              s3 << r5
            end
            if s3.last
              r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
              r3.extend(Sequence0)
            else
              self.index = i3
              r3 = nil
            end
            if r3
              s2 << r3
            else
              break
            end
          end
          if s2.empty?
            self.index = i2
            r2 = nil
          else
            r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          end
          s0 << r2
          if r2
            r6 = _nt_node_class_declarations
            s0 << r6
          end
        end
        if s0.last
          r0 = instantiate_node(Sequence,input, i0...index, s0)
          r0.extend(Sequence1)
          r0.extend(Sequence2)
        else
          self.index = i0
          r0 = nil
        end

        node_cache[:sequence][start_index] = r0

        return r0
      end