finalizer in Rust

> Same in Rust. For example, a Box or Vec owns memory on the heap - if they don’t dealloc it in drop, it’s leaked. There’s no real difference between C++ and Rust here.

Try to run the following code. The drop() function of the ObjectA doesn't destruct the 'b' member, i.e. it doesn't call to any equivalent of the delete operator of C++. But the it doesn't leak.

    struct ObjectA {
        b: Box<ObjectB>
    }

    struct ObjectB;

    impl Drop for ObjectA {
        fn drop(&mut self) {
            println!("dropping ObjectA")
        }
    }

    impl Drop for ObjectB {
        fn drop(&mut self) {
            println!("dropping ObjectB")
        }
    }

    fn main() {
        {
            let _a: ObjectA = ObjectA { b: Box::new(ObjectB) };
        }
        println!("End")
    }