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

class B extends core::Object {
  default constructor •() → void
    : super core::Object::•()
    ;
  method f(core::int x) → core::int {
    self::expect(x, 1);
    return 2;
  }
}
abstract class I extends core::Object {
  default constructor •() → void
    : super core::Object::•()
    ;
  abstract method f(covariant core::Object x) → core::int;
}
class C extends self::B implements self::I {
  default constructor •() → void
    : super self::B::•()
    ;
}
static method expectTypeError(() → void callback) → void {
  try {
    callback.call();
    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.==(expected)) {
    throw "Expected ${expected}, got ${value}";
  }
}
static method g(self::C c) → void {
  c.f("hello");
}
static method test(self::C c, self::I i) → void {
  self::expectTypeError(() → dynamic {
    i.f("hello");
  });
  self::expect(i.f(1), 2);
  self::expectTypeError(() → dynamic {
    c.f("hello");
  });
  self::expect(c.f(1), 2);
}
static method main() → dynamic {
  dynamic c = new self::C::•();
  self::test(c, c);
}