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

class B extends core::Object {
  synthetic constructor •() → self::B
    : super core::Object::•()
    ;
  method f(core::int x) → core::int {
    self::expect(x, 1);
    return 2;
  }
}
abstract class I extends core::Object {
  synthetic constructor •() → self::I
    : super core::Object::•()
    ;
  abstract method f(covariant-by-declaration core::Object x) → core::int;
}
class C extends self::B implements self::I {
  synthetic constructor •() → self::C
    : super self::B::•()
    ;
  forwarding-stub method f(covariant-by-declaration core::Object x) → core::int
    return super.{self::B::f}(x as core::int);
}
static method expectTypeError(() → void callback) → void {
  try {
    callback(){() → void};
    throw "Expected TypeError, did not occur";
  }
  on core::TypeError catch(no-exception-var) {
  }
}
static method expect(core::Object value, core::Object expected) → void {
  if(!(value =={core::Object::==}{(core::Object) → core::bool} expected)) {
    throw "Expected ${expected}, got ${value}";
  }
}
static method g(self::C c) → void {
  c.{self::C::f}("hello"){(core::Object) → core::int};
}
static method test(self::C c, self::I i) → void {
  self::expectTypeError(() → void {
    i.{self::I::f}("hello"){(core::Object) → core::int};
  });
  self::expect(i.{self::I::f}(1){(core::Object) → core::int}, 2);
  self::expectTypeError(() → void {
    c.{self::C::f}("hello"){(core::Object) → core::int};
  });
  self::expect(c.{self::C::f}(1){(core::Object) → core::int}, 2);
}
static method main() → dynamic {
  self::C c = new self::C::•();
  self::test(c, c);
}