Disabling struct destructor illegal?

[RazvanN via Digitalmars-d-learn]

struct A
{
    int a;
    @disable ~this() {}
}

void main()
{
    A a = A(2);
}
Currently, this code yields:

Error: destructor `A.~this` cannot be used because it is 
annotated with @disable

I was expecting that disabling the destructor would make it as if 
the struct does not have a destructor, instead it makes the 
program not compile. I find this behavior odd: why not make it 
illegal to disable the destructor if disabling it will surely 
result in errors wherever the struct is used. The only situation 
where the code will compile is A is never used directly. To make 
matters even more confusing, this code compiles:

class A
{
    int a;
    @disable ~this() {}
}

void main()
{
    A a = new A();
}


So, is this a bug or am I missing something?

Yoroshiku onegaishimasu,
RazvanN