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Initial, composed implementation of `Publisher.withLatestFrom`’s handling of error events.
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| // **Scenario one**: `withLatestFrom`’s argument erroring out first. | |
| struct SomeError: Error {} | |
| let first = PassthroughSubject<Int, SomeError>() | |
| let second = PassthroughSubject<String, SomeError>() | |
| var cancellables = Set<AnyCancellable>() | |
| first | |
| .withLatestFrom(second) // Our composed operator implementation of `withLatestFrom`. | |
| .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: .failure(.init())) | |
| // Outputs: | |
| // | |
| // ``` | |
| // one | |
| // failure(SomeError()) | |
| // ``` | |
| // **Scenario two**: Upstream erroring out first. | |
| // … | |
| first.send(1) | |
| second.send("one") | |
| first.send(2) | |
| second.send("two") | |
| first.send(completion: .failure(.init())) // `first` is subbed in for `second` here. | |
| // Outputs: | |
| // | |
| // ``` | |
| // one | |
| // failure(SomeError()) | |
| // ``` |
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