DMD-0.164 regressions

[Walter Bright]

class_26_A and class_26_B are invalid code. Both return a delegate that 
relies on the stack frame of foo() existing, but the delegate is called 
after foo() has exited.


More technically,

     1. dg contains the 'this' pointer for the instance of class C
     2. the instance of class C contains a member that is the frame 
pointer for the stack instance of foo()
     3. the stack instance of foo() contains a frame pointer for the 
stack instance of main()

dg(), to get at main.status, has to walk back through 1, 2 and 3. After 
foo() has exited, (2) points to garbage, and so cannot get a correct 
value for (3), and failure ensues.

This will be an excellent test case when D implements the ability for 
delegates to 'escape', but that won't be for 1.0.