Function alloc_with_freelist 

pub unsafe extern "C" fn alloc_with_freelist<T: PyClassWithFreeList>(
    subtype: *mut PyTypeObject,
    nitems: Py_ssize_t,
) -> *mut PyObject

Implementation of tp_alloc for freelist classes.

Safety

• subtype must be a valid pointer to the type object of T or a subclass.
• The calling thread must be attached to the interpreter