Code: ```python from memory import Pointer from memory import alloc def test_pointer(): ptr = alloc(4) Pointer(ptr) test_pointer() ``` Output: ``` free(): double free detected in tcache 2 ``` This also applies to `CustomType`. Code: ```python from memory import alloc from memory import make_object from memory.manager import CustomType from memory.manager import TypeManager manager = TypeManager() class Test(CustomType, metaclass=manager): _size = 4 def test_customtype(): ptr = alloc(4) make_object(Test, ptr) test_customtype() ``` Output: ``` free(): double free detected in tcache 2 ```