What's wrong with Copy Constructors? Why use Cloneable interface?

SomeClass x = new SomeClass();

SomeClass* x = new SomeClass();

*x = *another_x;

class A {
public A(A c) { aMember = c.aMember }
    int aMember;
}

class B : A {
public B(B c) : base(c) { bMember = c.bMember }
    int bMember;
}

class GenericContainer {
public GenericContainer(GenericContainer c) {
	// XXX Wrong code: if aBaseClass is an instance of B, the cloned member won't
	// be a B instance!
	aBaseClass = new A(c.aBaseClass);
}
    A aBaseClass;
}