// Test valid casts
class Main {
void main() {
C1 a, x;
C2 c,d;
C4 b,f;
Object o;
c = new C2();
a = new C1();
b = new C4();
f = new C4();
x = (C1) b;
o = (Object) f;
}
class C1 {}
class C2 extends C1{}
class C3 extends C2{}
class C4 extends C3{}