AfterDropBoxed is normaly used to store it in a struct,
is not really use full because you will always need to create a wrapper for a external crate!
But can be used for other crates to do something that thing is droped, but you define AfterDropBoxed
This is usefull for example if you want to do someting at the end of the function!
If you have a lot of branches in function,
with more returns will be really difficult to do this,
not really but you will need to call that function every time return!
But when using ? rust operator that will return without you knowing, this is really usefull!