# File lib/mail/parsers/rfc2822_obsolete.rb, line 1083
    def _nt_obs_angle_addr
      start_index = index
      if node_cache[:obs_angle_addr].has_key?(index)
        cached = node_cache[:obs_angle_addr][index]
        @index = cached.interval.end if cached
        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
        if has_terminal?("<", false, index)
          r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("<")
          r3 = nil
        end
        s0 << r3
        if r3
          r5 = _nt_obs_route
          if r5
            r4 = r5
          else
            r4 = instantiate_node(SyntaxNode,input, index...index)
          end
          s0 << r4
          if r4
            r6 = _nt_addr_spec
            s0 << r6
            if r6
              if has_terminal?(">", false, index)
                r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
                @index += 1
              else
                terminal_parse_failure(">")
                r7 = nil
              end
              s0 << r7
              if r7
                r9 = _nt_CFWS
                if r9
                  r8 = r9
                else
                  r8 = instantiate_node(SyntaxNode,input, index...index)
                end
                s0 << r8
              end
            end
          end
        end
      end
      if s0.last
        r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
        r0.extend(ObsAngleAddr0)
      else
        @index = i0
        r0 = nil
      end

      node_cache[:obs_angle_addr][start_index] = r0

      r0
    end