Mac Apps That Use Garbage Collection Must Move to ARC

[Tobias Pankrath via Digitalmars-d]

> Urgh. Product types masquerading as sum types. Give me a break 
> will ya. -- Andrei

1. The product solution is more pleasant to work with, if you 
have no sugar for sum types like pattern matching.

2. It's the same as with exception specifications: Product types 
make ignoring the error path easier thus are more popular.