library;
import self as self;
import "dart:core" as core;

class A extends core::Object {
  field self::B* b = null;
  synthetic constructor •() → self::A*
    : super core::Object::•()
    ;
}
class B extends core::Object {
  synthetic constructor •() → self::B*
    : super core::Object::•()
    ;
  operator +(core::int* i) → self::C*
    return null;
}
class C extends self::B {
  synthetic constructor •() → self::C*
    : super self::B::•()
    ;
}
static method main() → dynamic {
  self::A* a;
  let final self::A* #t1 = a in #t1.{core::Object::==}(null) ?{self::B*} null : #t1.{self::A::b} = #t1.{self::A::b}.{self::B::+}(1);
  self::C* c = (let final self::A* #t2 = a in #t2.{core::Object::==}(null) ?{self::B*} null : let final self::B* #t3 = #t2.{self::A::b} in let final void #t4 = #t2.{self::A::b} = #t3.{self::B::+}(1) in #t3) as{TypeError} self::C*;
}