module tb;
  typedef int unsigned uint32_t;

  typedef logic [1:0] tid_t;

  typedef tid_t tid_q[$];

  tid_q tid_queue;

  initial begin
    main();
    #1000ns;
    $finish;
  end

  task automatic main();
    gen_stimulus(1);
    gen_stimulus(2);
    gen_stimulus(3);
    gen_stimulus(4);
  endtask

  task automatic gen_stimulus(uint32_t transfers);
    if (transfers == 0) begin
      $display("tid_queue = %p", tid_queue);
      return;
    end
    else begin
      for(tid_t i = 0; i <= 2'b11; i++) begin
        tid_queue.push_back(i);
        gen_stimulus(transfers - 1);
        void'(tid_queue.pop_back());
        if (i == 2'b11) begin
          break;
        end
      end
    end
  endtask
endmodule