RxSwift subscription lifetimes.swift

import RxSwift

var disposeBag: DisposeBag! = DisposeBag()
var variable: Variable<[Int]>!
    = Variable<[Int]>([1, 2, 3])
var variableObserver: Observable! = variable.asObservable()
var subject: PublishSubject<[Int]>! = PublishSubject<[Int]>()
var observable: Observable<[Int]>!

func foo() {
    print("Subscribing...")
    observable = variable.asObservable()
    observable.subscribe(
        onNext: { next in print("\tonNext: \(next)") },
        onError: { error in },
        onCompleted: { print("\tCompleted") },
        onDisposed: { print("\tDisposed") })
        .disposed(by: disposeBag)

    print("Releaasing observable does not trigger onDisposed")
    observable = nil

//    print("Releaasing variable will trigger completed and disposed")
//    variable = nil

    print("releasing subscription triggers onDispose")
    disposeBag = nil
    print("Returning from foo()")
}

foo()
print("Returned")

Releaasing observable does not trigger onDisposed
releasing subscription triggers onDispose
	Disposed
Returning from foo()
Returned
done2

Subscribing...
	onNext: [1, 2, 3]
Releaasing observable does not trigger onDisposed
Releaasing variable will trigger completed and disposed
	Completed
	Disposed
Returning from foo()
Returned
done2