[issue17643] Expose weakref callback for introspection purposes.

[Terry J. Reedy]

Terry J. Reedy added the comment:

> there are other tests in that test module that also rely on del resulting in immediate cleanup

I would mark them all as 'cpython-only', since they are. Other implementation must be omitting this test module, ignoring its failures, or patching out the specific tests.

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nosy: +terry.reedy

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<http://bugs.python.org/issue17643>
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