# File lib/cucumber/parser/feature.rb, line 302
      def _nt_tag
        start_index = index
        if node_cache[:tag].has_key?(index)
          cached = node_cache[:tag][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        if has_terminal?('@', false, index)
          r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure('@')
          r1 = nil
        end
        s0 << r1
        if r1
          s2, i2 = [], index
          loop do
            if has_terminal?('\G[^@\\r\\n\\t ]', true, index)
              r3 = true
              @index += 1
            else
              r3 = nil
            end
            if r3
              s2 << r3
            else
              break
            end
          end
          if s2.empty?
            @index = i2
            r2 = nil
          else
            r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          end
          s0 << r2
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(Tag0)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:tag][start_index] = r0

        r0
      end