Unfortunately, this PR28615 seems to have broken a bunch of buildbots. For instance:

https://buildbot.python.org/all/#/builders/75/builds/172/steps/5/logs/stdio

```
test_divide_and_round (test.datetimetester.TestModule_Pure) ... ok
test_divide_and_round (test.datetimetester.TestModule_Fast) ... skipped 'Only run for Pure Python implementation'
----------------------------------------------------------------------
Ran 2 tests in 0.000s
OK (skipped=1)
test_divide_and_round (test.datetimetester.TestModule_Pure) ... ERROR
.test test_datetime failed
test_divide_and_round (test.datetimetester.TestModule_Fast) ... skipped 'Only run for Pure Python implementation'
======================================================================
ERROR: test_divide_and_round (test.datetimetester.TestModule_Pure)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.refleak/build/Lib/test/datetimetester.py", line 88, in test_divide_and_round
    dar = datetime_module._divide_and_round
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'datetime' has no attribute '_divide_and_round'
----------------------------------------------------------------------
Ran 2 tests in 0.003s
FAILED (errors=1, skipped=1)
1 test failed again:
    test_datetime
== Tests result: FAILURE then FAILURE ==
```