Polly is a parrot
Molly is a dog
Woof!
Constructing Example5..
In Example5::callback() 
Polly is a parrot
Molly is a dog
The following error is expected: Incompatible function arguments. The following argument types are supported:
    1. dog_bark(Dog) -> None

Callback function 1 called!
False
Callback function 2 called : Hello, True, 5
5
got callback: 3 4
Destructing Example5..