# File lib/cucumber/parser/feature.rb, line 1003
      def _nt_step
        start_index = index
        if node_cache[:step].has_key?(index)
          cached = node_cache[:step][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        r1 = _nt_comment
        s0 << r1
        if r1
          s2, i2 = [], index
          loop do
            r3 = _nt_space
            if r3
              s2 << r3
            else
              break
            end
          end
          r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          s0 << r2
          if r2
            r4 = _nt_step_keyword
            s0 << r4
            if r4
              r5 = _nt_keyword_space
              s0 << r5
              if r5
                r6 = _nt_line_to_eol
                s0 << r6
                if r6
                  i7 = index
                  s8, i8 = [], index
                  loop do
                    r9 = _nt_eol
                    if r9
                      s8 << r9
                    else
                      break
                    end
                  end
                  if s8.empty?
                    @index = i8
                    r8 = nil
                  else
                    r8 = instantiate_node(SyntaxNode,input, i8...index, s8)
                  end
                  if r8
                    r7 = r8
                  else
                    r10 = _nt_eof
                    if r10
                      r7 = r10
                    else
                      @index = i7
                      r7 = nil
                    end
                  end
                  s0 << r7
                  if r7
                    r12 = _nt_multiline_arg
                    if r12
                      r11 = r12
                    else
                      r11 = instantiate_node(SyntaxNode,input, index...index)
                    end
                    s0 << r11
                    if r11
                      r13 = _nt_white
                      s0 << r13
                    end
                  end
                end
              end
            end
          end
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(Step0)
          r0.extend(Step1)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:step][start_index] = r0

        r0
      end