# File lib/treetop/compiler/metagrammar.rb, line 571
      def _nt_declaration_sequence
        start_index = index
        if node_cache[:declaration_sequence].has_key?(index)
          cached = node_cache[:declaration_sequence][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0 = index
        i1, s1 = index, []
        r2 = _nt_declaration
        s1 << r2
        if r2
          s3, i3 = [], index
          loop do
            i4, s4 = index, []
            r5 = _nt_space
            s4 << r5
            if r5
              r6 = _nt_declaration
              s4 << r6
            end
            if s4.last
              r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
              r4.extend(DeclarationSequence0)
            else
              self.index = i4
              r4 = nil
            end
            if r4
              s3 << r4
            else
              break
            end
          end
          r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
          s1 << r3
        end
        if s1.last
          r1 = instantiate_node(DeclarationSequence,input, i1...index, s1)
          r1.extend(DeclarationSequence1)
          r1.extend(DeclarationSequence2)
        else
          self.index = i1
          r1 = nil
        end
        if r1
          r0 = r1
        else
          if input.index('', index) == index
            r7 = instantiate_node(SyntaxNode,input, index...(index + 0))
            r7.extend(DeclarationSequence3)
            @index += 0
          else
            terminal_parse_failure('')
            r7 = nil
          end
          if r7
            r0 = r7
          else
            self.index = i0
            r0 = nil
          end
        end

        node_cache[:declaration_sequence][start_index] = r0

        return r0
      end