library test;

class I1 {
  int x = 0;
}

class I2 extends I1 {
  int y = 0;
}

class A {
  final I1 a = throw '';
}

class B {
  final I2 a = throw '';
}

class C1 implements A, B {
  get a => throw '';
}

class C2 implements B, A {
  get a => throw '';
}

main() {}