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

class A extends core::Object {
  synthetic constructor •() → self::A
    : super core::Object::•()
    ;
}
class B extends self::A {
  synthetic constructor •() → self::B
    : super self::A::•()
    ;
}
class C extends core::Object {
  synthetic constructor •() → self::C
    : super core::Object::•()
    ;
  method f(self::B b) → void {}
}
abstract class I extends core::Object {
  synthetic constructor •() → self::I
    : super core::Object::•()
    ;
  abstract method f(covariant-by-declaration self::A a) → void;
}
class D extends self::C implements self::I {
  synthetic constructor •() → self::D
    : super self::C::•()
    ;
  forwarding-stub method f(covariant-by-declaration self::A a) → void
    return super.{self::C::f}(a as self::B);
}
static method main() → void {
  self::I i = new self::D::•();
  try {
    i.{self::I::f}(new self::A::•()){(self::A) → void};
  }
  on core::Object catch(final core::Object _) {
    return;
  }
  throw "Missing type error";
}