anchor.diff:                ct_groupname/0,
                 ct_config/0,
                 ct_status/0,
  -              ct_groups_def/0,
  -              ct_tests_def/0,
  +              ct_group_def/0,
  +              ct_test_def/0,
                 ct_info/0
                ]).
   
  
positive.code: -type ct_group_ref() :: {group, ct_groupname()} |
              {group, ct_groupname(), ct_group_props_ref()} |
              {group, ct_groupname(), ct_group_props_ref(), ct_subgroups_def()}.
  -type ct_testcase_ref() :: {testcase, ct_testname(), ct_testcase_repeat_props()}.
  -type ct_testcase_repeat_props() :: {repeat, ct_test_repeat()} |
              {repeat_until_ok, ct_test_repeat()} |
              {repeat_until_fail, ct_test_repeat()}.
  -type ct_info() :: {timetrap, ct_info_timetrap()} |
  
negative.code:             repeat_until_any_fail.
  -type ct_test_repeat() :: integer() |
              forever.
  -type ct_group_def() :: {ct_groupname(), ct_group_props(), [
                  ct_testname() |
                  ct_group_def() |
                  {group, ct_groupname()} |
                  ct_testcase_ref()
              ]}.
  