# File lib/cucumber/parser/feature.rb, line 72
      def _nt_feature_sub
        start_index = index
        if node_cache[:feature_sub].has_key?(index)
          cached = node_cache[:feature_sub][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        r1 = _nt_white
        s0 << r1
        if r1
          r2 = _nt_comment
          s0 << r2
          if r2
            r3 = _nt_white
            s0 << r3
            if r3
              r4 = _nt_tags
              s0 << r4
              if r4
                r5 = _nt_white
                s0 << r5
                if r5
                  s6, i6 = [], index
                  loop do
                    i7, s7 = index, []
                    i8 = index
                    i9 = index
                    r10 = _nt_scenario_outline
                    if r10
                      r9 = r10
                    else
                      r11 = _nt_scenario
                      if r11
                        r9 = r11
                      else
                        r12 = _nt_background
                        if r12
                          r9 = r12
                        else
                          @index = i9
                          r9 = nil
                        end
                      end
                    end
                    if r9
                      r8 = nil
                    else
                      @index = i8
                      r8 = instantiate_node(SyntaxNode,input, index...index)
                    end
                    s7 << r8
                    if r8
                      if index < input_length
                        r13 = instantiate_node(SyntaxNode,input, index...(index + 1))
                        @index += 1
                      else
                        terminal_parse_failure("any character")
                        r13 = nil
                      end
                      s7 << r13
                    end
                    if s7.last
                      r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
                      r7.extend(FeatureSub0)
                    else
                      @index = i7
                      r7 = nil
                    end
                    if r7
                      s6 << r7
                    else
                      break
                    end
                  end
                  r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
                  s0 << r6
                  if r6
                    r15 = _nt_background
                    if r15
                      r14 = r15
                    else
                      r14 = instantiate_node(SyntaxNode,input, index...index)
                    end
                    s0 << r14
                    if r14
                      r16 = _nt_feature_elements
                      s0 << r16
                      if r16
                        r18 = _nt_comment
                        if r18
                          r17 = r18
                        else
                          r17 = instantiate_node(SyntaxNode,input, index...index)
                        end
                        s0 << r17
                      end
                    end
                  end
                end
              end
            end
          end
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(FeatureSub1)
          r0.extend(FeatureSub2)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:feature_sub][start_index] = r0

        r0
      end