ERROR: test_gridfs_attrs (tornado_tests.test_motor_core.MotorCoreTestGridFS)
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Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/testing.py", line 98, in __call__
    result = self.orig_method(*args, **kwargs)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 164, in test_gridfs_attrs
    attrs(MotorGridFSBucket(self.cx.test)) - motor_gridfs_only)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 29, in attrs
    return set(a for a in dir(klass) if not a.startswith('_'))
TypeError: descriptor '__dict__' for 'AgnosticGridFSBucket' objects doesn't apply to a 'MotorGridFSBucket' object
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ERROR: test_gridin_attrs (tornado_tests.test_motor_core.MotorCoreTestGridFS)
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Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/testing.py", line 98, in __call__
    result = self.orig_method(*args, **kwargs)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 171, in test_gridin_attrs
    attrs(MotorGridIn(self.cx.test.fs)) - motor_gridin_only)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 29, in attrs
    return set(a for a in dir(klass) if not a.startswith('_'))
TypeError: descriptor '__dict__' for 'AgnosticGridIn' objects doesn't apply to a 'MotorGridIn' object
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ERROR: test_gridout_attrs (tornado_tests.test_motor_core.MotorCoreTestGridFS)
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Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/testing.py", line 98, in __call__
    result = self.orig_method(*args, **kwargs)
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/testing.py", line 594, in post_coroutine
    return self.io_loop.run_sync(
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/ioloop.py", line 532, in run_sync
    return future_cell[0].result()
  File "/home/travis/virtualenv/python3.8.0/lib/python3.8/site-packages/tornado/gen.py", line 748, in run
    yielded = self.gen.send(value)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 184, in test_gridout_attrs
    attrs(motor_gridout) - motor_gridout_only)
  File "/home/travis/build/mongodb/motor/test/tornado_tests/test_motor_core.py", line 29, in attrs
    return set(a for a in dir(klass) if not a.startswith('_'))
TypeError: descriptor '__dict__' for 'AgnosticGridOut' objects doesn't apply to a 'MotorGridOut' object