# File lib/mail/parsers/rfc2822_obsolete.rb, line 1622
    def _nt_obs_addr_list
      start_index = index
      if node_cache[:obs_addr_list].has_key?(index)
        cached = node_cache[:obs_addr_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, []
      s1, i1 = [], index
      loop do
        i2, s2 = index, []
        r4 = _nt_address
        if r4
          r3 = r4
        else
          r3 = instantiate_node(SyntaxNode,input, index...index)
        end
        s2 << r3
        if r3
          r6 = _nt_CFWS
          if r6
            r5 = r6
          else
            r5 = instantiate_node(SyntaxNode,input, index...index)
          end
          s2 << r5
          if r5
            if has_terminal?(",", false, index)
              r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
              @index += 1
            else
              terminal_parse_failure(",")
              r7 = nil
            end
            s2 << r7
            if r7
              r9 = _nt_CFWS
              if r9
                r8 = r9
              else
                r8 = instantiate_node(SyntaxNode,input, index...index)
              end
              s2 << r8
            end
          end
        end
        if s2.last
          r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          r2.extend(ObsAddrList0)
        else
          @index = i2
          r2 = nil
        end
        if r2
          s1 << r2
        else
          break
        end
      end
      if s1.empty?
        @index = i1
        r1 = nil
      else
        r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
      end
      s0 << r1
      if r1
        r11 = _nt_address
        if r11
          r10 = r11
        else
          r10 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r10
      end
      if s0.last
        r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
        r0.extend(ObsAddrList1)
      else
        @index = i0
        r0 = nil
      end

      node_cache[:obs_addr_list][start_index] = r0

      r0
    end