// This is valid, but means we can only ever call returns_generic[bool]
func returns_generic[T]() -> T { true }

func id[T](value: T) -> T { value }

func call_bark_method[T](instance: T) {
    instance.bark()
}

func animal_full_suite[A](animal: A) {
    animal.bark();
    animal.eat();
    animal.scream();
    animal.run();
    animal.swim();
    animal.fly();
}