# File lib/treetop/compiler/metagrammar.rb, line 1914
      def _nt_occurrence_range
        start_index = index
        if node_cache[:occurrence_range].has_key?(index)
          cached = node_cache[:occurrence_range][index]
          if cached
            cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
            @index = cached.interval.end
          end
          return cached
        end

        i0, s0 = index, []
        r2 = _nt_space
        if r2
          r1 = r2
        else
          r1 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r1
        if r1
          s3, i3 = [], index
          loop do
            if has_terminal?('\G[0-9]', true, index)
              r4 = true
              @index += 1
            else
              r4 = nil
            end
            if r4
              s3 << r4
            else
              break
            end
          end
          r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
          s0 << r3
          if r3
            if has_terminal?('..', false, index)
              r5 = instantiate_node(SyntaxNode,input, index...(index + 2))
              @index += 2
            else
              terminal_parse_failure('..')
              r5 = nil
            end
            s0 << r5
            if r5
              s6, i6 = [], index
              loop do
                if has_terminal?('\G[0-9]', true, index)
                  r7 = true
                  @index += 1
                else
                  r7 = nil
                end
                if r7
                  s6 << r7
                else
                  break
                end
              end
              r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
              s0 << r6
            end
          end
        end
        if s0.last
          r0 = instantiate_node(OccurrenceRange,input, i0...index, s0)
          r0.extend(OccurrenceRange0)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:occurrence_range][start_index] = r0

        r0
      end