Error: circular reference to variable cause by order (bugs?)

[Dakota]

I am trying to translate some c code into d, get this error:

```d
struct A {
	void* sub;
}

struct B {
	void* subs;
}

__gshared {
	const A[1] a0 = [
		{ &b1_ptr },
	];
	const A[2] a1 = [
		{ &b1_ptr },
	];
	const B b1 = {a1.ptr};
	const b1_ptr = &b1;

	const A[1] a2 = [
		{ &b1_ptr },
	];
	const B b2 = {a2.ptr};
	const b2_ptr = &b2;
}

```

```sh
  Error: circular reference to variable `tests.b1_ptr`
```

If I move `a0` after `b2_ptr`, no error any more.

The c code has circular reference type, and compile ok. and there 
is a lot type I am not able to adjust order by hand to guess 
right order.

the translate code still need to work with C interface, so I can 
not change the struct layout.  is this a bug of d?