A.java

package p;
class A{
   boolean A = new A() instanceof A;
   A A(A A){
     A:
        for (;;){
          if (A.A(A)==A)
             break A;
        }
      return A;
   };
}
class AA extends A{
   A A = (A) new A();
   A A(A A){
     A:
        for (;;){
          if (A.A(A)==A)
             break A;
        }
      return A;
   };
}