Class Break

Lib/test/test_asyncio/test_tasks.py:2781–2783

    def test_proper_refcounts(self):
        # see: https://github.com/python/cpython/issues/126083
        class Break:
            def __str__(self):
                raise RuntimeError("break")

        obj = object()
        initial_refcount = sys.getrefcount(obj)