At this point you can't separate Swift from the rest of the system so cleanly. Since it's now included with the OS directly and linked to from many system libra

At this point you can't separate Swift from the rest of the system so cleanly. Since it's now included with the OS directly and linked to from many system libraries, including parts of Foundation which have been directly rewritten in Swift while maintaining ABI compatibility with Obj-C callers, virtually everything on the system that uses Apple's frameworks uses Swift to some degree.