anchor.diff:    maybe_delete(Filename).
   
   t_2_test() ->
  -  Filename = "redbug.txt",
  +  Filename = "redbug2.txt",
     {_,_} = redbug:start("lists:sort->stack",[{print_file,Filename},debug]),
     [1,2,3] = lists:sort([3,2,1]),
     timer:sleep(100),
  
positive.code: -include_lib("eunit/include/eunit.hrl").
  
  t_0_test() ->
    Filename = "redbug.txt",
    {_,_} = redbug:start("lists:sort",[{print_file,Filename},print_msec,debug]),
    [1,2,3] = lists:sort([3,2,1]),
    timer:sleep(100),
  
negative.code:   maybe_delete(Filename).
  
  t_3_test() ->
    Filename = "redbug3.txt",
    Pid = spawn(fun()->receive P when is_pid(P)->P!ding;quit->ok end end),
    {_,_} = redbug:start(send,[{procs,Pid},{print_file,Filename},debug]),
    Pid ! self(),
  