858 – Forward reference to struct inside class crashes the compiler

E:\prog\>dmd dontwork.d
---
The instruction as "0x004565b9" referenced memory at "0x00000038". The memory could not be "read".
---
E:\prog\>dmd work.d
E:\apps\dm\bin\link.exe work,,,user32+kernel32/noi;
/** dontwork.d **/
class Outer
{
 public:
 this()
 {
 B sc = new B();
 }
 class B
 {
 Strct str;
 }
}
struct Strct
{
 int i;
}
int main(char[][] args)
{
 return 0;
}
/** work.d **/
struct Strct
{
 int i;
}
class Outer
{
 public:
 this()
 {
 B sc = new B();
 }
 class B
 {
 Strct str;
 }
}
int main(char[][] args)
{
 return 0;
}
***

Added to DStress as
http://dstress.kuehne.cn/run/f/forward_reference_17_A.d
http://dstress.kuehne.cn/run/f/forward_reference_17_B.d 

The code generation seems to crash because the vthis member of Inner's ClassDeclaration is NULL. 
This happens when semantic is called again from runDeferredSemantic: first vthis is set to baseClass->vthis (baseClass is Object and vthis there is NULL) and then the interface and nested code isn't run again to correct it because sizeok != 0.

I looked at the code in dstress, not the one posted here. The Inner in my description is georg's inner B class.

No longer segfaults in DMD2.040 and 1.030. Still doesn't compile (generates a forward reference error).
However, the original bug is fixed.
TEST CASE:
---
class A{
 class B {
 S s;
 }
 void foo() {
 B b = new B();
 }
}
struct S {}
---
ice.d(6): Error: forward reference to B