Confirmed that this fixes the broken buildbots:

./python -m test test_tools -vvvv -uall -m test_files
== CPython 3.8.0a4+ (heads/master:91f4380ced, May 26 2019, 17:30:21) [GCC 8.3.0]
== Linux-5.0.15-1-MANJARO-x86_64-with-glibc2.29 little-endian
== cwd: /home/pablogsal/github/cpython/build/test_python_25649
== CPU count: 12
== encodings: locale=UTF-8, FS=utf-8
Run tests sequentially
0:00:00 load avg: 0.50 [1/1] test_tools
test_files (test.test_tools.test_unparse.DirectoryTestCase) ... Testing /home/pablogsal/github/cpython/Lib/typing.py
Testing /home/pablogsal/github/cpython/Lib/test/test_typing.py
ok

Ran 1 test in 0.586s

OK

== Tests result: SUCCESS ==

1 test OK.

Total duration: 671 ms
Tests result: SUCCESS

The manual check is needed because the CI in GitHub does not run test_tools over all files so it does not take forever.