I am not sure of the exact cause about this failure but `./python.exe -m test -m test_gc` fails though `./python.exe -m test -v test_gc` passes. This test was recently added with 175421b58cc97a2555e474f479f30a6c5d2250b0 and issue36016.

./python.exe -m test -m test_gc
== CPython 3.8.0a2+ (heads/master:f684d83d86, Mar 1 2019, 10:39:16) [Clang 7.0.2 (clang-700.1.81)]
== macOS-10.10.4-x86_64-i386-64bit little-endian
== cwd: /Users/karthikeyansingaravelan/stuff/python/cpython/build/test_python_21045
== CPU count: 4
== encodings: locale=UTF-8, FS=utf-8
Run tests sequentially
0:00:00 load avg: 1.85 [  1/420] test_grammar
[snip]
0:00:36 load avg: 2.17 [156/420] test_gc -- test_future5 run no tests
test test_gc failed -- Traceback (most recent call last):
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/test/test_gc.py", line 775, in test_get_objects
    self.assertNotIn(l, gc.get_objects(generation=2))
AssertionError: [[...]] unexpectedly found in <list object at 0x112b5d668>
0:00:48 load avg: 2.14 [157/420/1] test_gdb -- test_gc failed