library test /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A extends core::Object implements self::B {
  synthetic constructor •() → self::A
    : super core::Object::•()
    ;
  get x() → core::int
    return self::f() as{TypeError,ForDynamic,ForNonNullableByDefault} core::int;
}
abstract class B extends core::Object implements self::C {
  synthetic constructor •() → self::B
    : super core::Object::•()
    ;
  abstract get x() → core::int;
}
abstract class C extends core::Object {
  synthetic constructor •() → self::C
    : super core::Object::•()
    ;
  abstract get x() → core::int;
}
static method f() → dynamic
  return null;
static method main() → dynamic {}