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Initial, composed implementation of `Publisher.withLatestFrom`’s handling of finished events.
// …back to using our implementation —
// **Scenario one**: `withLatestFrom`’s argument finishes first.
let first = PassthroughSubject<Int, Never>()
let second = PassthroughSubject<String, Never>()
var cancellables = Set<AnyCancellable>()
first
.withLatestFrom(second)
.sink(receiveCompletion: { print($0) }, receiveValue: { print($0) })
.store(in: &cancellables)
first.send(1)
second.send("one")
first.send(2)
second.send("two")
second.send(completion: .finished)
// Outputs:
//
// ```
// one
// ```
// **Scenario two**: Upstream finishes first.
//
first.send(1)
second.send("one")
first.send(2)
second.send("two")
first.send(completion: .finished)
// Outputs:
//
// ```
// one
// ```
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