# File lib/cucumber/parser/feature.rb, line 713
      def _nt_scenario
        start_index = index
        if node_cache[:scenario].has_key?(index)
          cached = node_cache[:scenario][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        r1 = _nt_comment
        s0 << r1
        if r1
          r2 = _nt_tags
          s0 << r2
          if r2
            r3 = _nt_white
            s0 << r3
            if r3
              r4 = _nt_scenario_keyword
              s0 << r4
              if r4
                s5, i5 = [], index
                loop do
                  r6 = _nt_space
                  if r6
                    s5 << r6
                  else
                    break
                  end
                end
                r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
                s0 << r5
                if r5
                  r7 = _nt_lines_to_keyword
                  s0 << r7
                  if r7
                    r8 = _nt_white
                    s0 << r8
                    if r8
                      r9 = _nt_steps
                      s0 << r9
                      if r9
                        r10 = _nt_white
                        s0 << r10
                      end
                    end
                  end
                end
              end
            end
          end
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(Scenario0)
          r0.extend(Scenario1)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:scenario][start_index] = r0

        r0
      end