Is it a bug ?

[Du Liang]

import std.stdio;

class A{
        int x;
        struct AS{int y;}
}
class B:A{ }

void main(){
        B:A.AS   as1;   /// : : : : ? ? ?   B : A . AS ??
        as1.y = 100;
        writeln(as1.y);
        A.AS   as2;
        as2.y = 200;
        writeln(as2.y);
        readln();
}