struct SimpleError: Error {
    
}
let numbers = [5, 4, 3, 2, 1, 0, 9, 8, 7, 6]
let cancellable = numbers.publisher
    .tryLast(where: {
        guard $0 != 0 else {throw SimpleError()}
        return true
    })
    .catch({ (error) in
        Just(-1)
    })
    .sink { print("\($0)") }
    // Prints: -1