Pointer Freeing - Does this work?

p_free.rs

struct my_c_struct {
  f1:int,
  f2:int
}

type MyStruct = my_c_struct;

impl Drop for MyStruct {
  fn finalize(&self) {
    unsafe {
      core::libc::free(ptr::addr_of(self))
      cast::forget(self)
    }
  }
}

unsafe fn get_c_struct() -> *my_c_struct;

fn my_safe_wrapper() -> ~MyStruct {
  unsafe { cast::transmute(get_c_struct()) }
}

p_wrapper.rs

struct Ptr<T> {
  priv ptr: *T
}

#[unsafe_destructor]
impl<T> Drop for Ptr<T> {
  fn finalize(&self) {
    unsafe { core::libc::free(self.ptr); }
  }
}