Slipcover causes Pickler failure

[jaltmayerpizzorno]

A test in attrs' suite fails because Slipcover's tracker is held within a PyCapsule.

$ python3 -m slipcover --silent -m pytest -x
============================================================ test session starts =============================================================
platform darwin -- Python 3.9.12, pytest-7.0.1, pluggy-1.0.0
rootdir: /Users/juan/tmp/attrs, configfile: tox.ini, testpaths: tests
collected 1203 items                                                                                                                         

tests/test_3rd_party.py F

================================================================== FAILURES ==================================================================
______________________________________________________ TestCloudpickleCompat.test_repr _______________________________________________________

self = <tests.test_3rd_party.TestCloudpickleCompat object at 0x10911f970>

    @given(simple_classes())
>   def test_repr(self, cls):

tests/test_3rd_party.py:23: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/test_3rd_party.py:30: in test_repr
    pkl = cloudpickle.dumps(inst)
/usr/local/lib/python3.9/site-packages/cloudpickle/cloudpickle_fast.py:73: in dumps
    cp.dump(obj)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <cloudpickle.cloudpickle_fast.CloudPickler object at 0x109ae0880>, obj = HypClass()

    def dump(self, obj):
        try:
>           return Pickler.dump(self, obj)
E           TypeError: cannot pickle 'PyCapsule' object

/usr/local/lib/python3.9/site-packages/cloudpickle/cloudpickle_fast.py:563: TypeError
------------------------------------------------------------ Captured stdout call ------------------------------------------------------------
Falsifying example: test_repr(
    cls=tests.strategies.HypClass,
    self=<tests.test_3rd_party.TestCloudpickleCompat at 0x10911f970>,
)
========================================================== short test summary info ===========================================================
FAILED tests/test_3rd_party.py::TestCloudpickleCompat::test_repr - TypeError: cannot pickle 'PyCapsule' object
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
============================================================= 1 failed in 0.57s ==============================================================

[jaltmayerpizzorno]

This issue has been resolved for Python 3.12+ due to SlipCover's move to using sys.monitoring.