compiler does not detect accessing on null class object.

[dangbinghoo via Digitalmars-d-learn]

hello,

code below:
-----
    class a  {
        string a1;
    }
    a a1;
    writeln(a1.a1);
-----

compiles and produce "core dump" or "segfault", does this fit the 
original D design? why the compiler does not detect for accessing 
a null object and refused to compile?



And, 2nd question: where can I find the Subset spec of SafeD?


Thanks!

--------------
binghoo dang