extern(C++): Unresolved scalar deleting destructor

[Vladimir Marchevsky]

Back to questions after homework done :) What I've tested:

Made test class in CPP:

---testlib.cpp
class __declspec(dllexport) Foo {
     int *a;

public:
     Foo(int value) {
         a = new int(value);
     }

     ~Foo() {
         delete a;
     }
};
---

Binding on D side:

---
extern(C++) {
     class Foo {
         this(int value);
         final ~this();    //btw, is this a correct way to bind a 
non-virtual member?
                           //What about inheritance and so on?..
     }
}
---

Binding works perfect, both ctor and dtor work.

Changed dtor to be virtual (and removed final from D side) - 
anyway, compiles and works perfect. I can provide D 
implementation of destructor which replaces original virtual one 
(is it correct? Or can I call original one from D-specified?) - 
making it empty leads to memory leak as expected. So I see no 
problems here.

Back to QObject. Its destructor is "virtual ~QObject();" but 
having "~this();" on D side again leads to "unresolved scalar 
deleting destructor" of QObject. It looks like actual destructor 
binds correct (I would have another error if I make binding 
incorrect with "final ~this()") but for some reason it wants this 
another thing... Why?