If you count Rc/Arc as garbage collection you should count RAII + The Borrow Checker (i.e. all safe rust) as garbage collection too IMHO. It collects garbage just as automatically - it just does so extremely efficiently.
That said I tend to count neither. Garbage collection to me suggests you have something going around collecting it, not just you detect you're done with something when you're done with it and deal with it yourself.