% ./python.exe 
Python 3.12.0a0 (heads/main:3473817106, Jun 12 2022, 15:19:26) [Clang 13.1.6 (clang-1316.0.21.2.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()

% ./python.exe -m test -R3:3 -v test_capi -m test_pytype_fromspec_with_repeated_slots

[...]

test_capi leaked [6, 6, 6] references, sum=18
test_capi failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
    test_capi