anchor.diff:  
   -export([new/0,
            new/2,
  +         flush/1,
            to_list/1,
            push/2,
            push/4,
  
positive.code:         high_limit=Highthreshold,
          queue=queue:new()},
      InitQueue.
  
  
  %% @doc Push a request onto the end of the request queue
  
negative.code:     [?_assertEqual(1, ?rqueue:size(Q1)),
       ?_assertEqual({0,0,1}, ?rqueue:peek(Q1)),
       ?_assertEqual([{0,0,1}], ?rqueue:to_list(Q1)),
       ?_assertEqual([], ?rqueue:to_list(Q2)),
       ?_assertEqual(0, ?rqueue:size(?rqueue:flush(Q1)))].
  
  head_check_test_() ->
      Q0 = ?rqueue:new(),
  