import std.stdio;

​

class A

{

    B b = new B();

}

​

class B

{

    int i = 0;

}

​

void main()

{

    A firstA = new A();

    A secondA = new A();

    firstA.b.i = 42;

    writeln("First A's b.i: ", firstA.b.i);

    writeln("Second A's b.i: ", secondA.b.i);

}