Rabbit is a parrot
Polly is a parrot
Molly is a dog
Woof!
func(43) = 44
Payload constructor
Payload copy constructor
Payload move constructor
Payload destructor
Payload destructor
Payload destructor
Rabbit is a parrot
Polly is a parrot
Molly is a dog
The following error is expected: Incompatible function arguments. The following argument types are supported:
    1. (example.Dog) -> NoneType

Callback function 1 called!
False
Callback function 2 called : Hello, x, True, 5
5
func(43) = 44