ake the cycle unreachable, but keep the global reference
        #    to `latefin` so that it isn't detected as garbage. This
        #    way its finalizer will not be called immediately.
        del func, cyc

        # 3. Invoke garbage collection,
        #    which will find `cyc` and `func` as garbage.
        gc.collect()

        # 9. Previously, this would crash because `func_qualname`
        #    had been NULL-ed out by func_clear().
        print(f"{func=}")
        ú