# File lib/mail/parsers/rfc2822.rb, line 4203
    def _nt_name_val_list
      start_index = index
      if node_cache[:name_val_list].has_key?(index)
        cached = node_cache[:name_val_list][index]
        if cached
          cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
          @index = cached.interval.end
        end
        return cached
      end

      i0, s0 = index, []
      r2 = _nt_CFWS
      if r2
        r1 = r2
      else
        r1 = instantiate_node(SyntaxNode,input, index...index)
      end
      s0 << r1
      if r1
        i3, s3 = index, []
        r4 = _nt_name_val_pair
        s3 << r4
        if r4
          s5, i5 = [], index
          loop do
            i6, s6 = index, []
            r7 = _nt_CFWS
            s6 << r7
            if r7
              r8 = _nt_name_val_pair
              s6 << r8
            end
            if s6.last
              r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
              r6.extend(NameValList0)
            else
              @index = i6
              r6 = nil
            end
            if r6
              s5 << r6
            else
              break
            end
          end
          r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
          s3 << r5
        end
        if s3.last
          r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
          r3.extend(NameValList1)
        else
          @index = i3
          r3 = nil
        end
        s0 << r3
      end
      if s0.last
        r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
        r0.extend(NameValList2)
      else
        @index = i0
        r0 = nil
      end

      node_cache[:name_val_list][start_index] = r0

      r0
    end