anchor.diff:      Outdir = filename:join(PrivDir, "core"),
       ok = file:make_dir(Outdir),
   
  -    Wc = filename:join(filename:dirname(code:which(?MODULE)), "*.beam"),
  -    TestBeams = filelib:wildcard(Wc),
  +    TestBeams = get_unique_beam_files(),
       Abstr = [begin {ok,{Mod,[{abstract_code,
   				    {raw_abstract_v1,Abstr}}]}} = 
   			     beam_lib:chunks(Beam, [abstract_code]),
  
positive.code: 	beam_lib:chunks(Target, [compile_info]),
      {options,BeamOpts} = lists:keyfind(options, 1, CInfo),
      Opts = BeamOpts.
  
negative.code:     Outdir = filename:join(PrivDir, atom_to_list(?FUNCTION_NAME)),
      ok = file:make_dir(Outdir),
  
      TestBeams = get_unique_beam_files(),
      test_lib:p_run(fun(F) -> do_core_roundtrip(F, Outdir) end, TestBeams).
  
  do_core_roundtrip(Beam, Outdir) ->
  