Combine_tryMin.swift

struct IllegalValueError: Error {}

let numbers: [Int]  = [0, 10, 6, 13, 22, 22]
numbers.publisher
    .tryMin { first, second -> Bool in
        if (first % 2 != 0) {
            throw IllegalValueError()
        }
        return first < second
    }
    .sink(
        receiveCompletion: { print ("completion: \($0)") },
        receiveValue: { print ("value: \($0)") }
    )

// Prints: "completion: failure(IllegalValueError())"