Swift's GC is in the form of pervasive reference counting for reference types with no automatic cycle detection. Though as we're demonstrating, calling this GC is contentious, it would be better if people weren't too lazy to type out "pervasive reference counting for reference types with no automatic cycle detection". :P

(For the record, I believe Chris Lattner is on the record as saying "yes, Swift has a runtime, let's not bother arguing that point" though I can't find the link, but I agree that Swift's runtime is less invasive than most other languages (e.g. Go).)