'sink' never is called when using 'receive'

Using Swift
,
8

sink is never invoked.

struct MainView : View {
    var requestCancellable: AnyCancellable
    
    init() {
        requestCancellable = Just("1")
        .flatMap { val -> Empty<String, Never> in
            return .init()
        }
        .receive(on: RunLoop.main)
        .sink(receiveCompletion: { completion in
            print(1, completion)
        }) { val in
            print(2, val)
        }    }
    
    var body: some View {
        VStack {
            EmptyView()
        }
    }
}