Example `Result.Publisher` usage.

result_publisher.swift

import Combine
import PlaygroundSupport

enum SomeError: Error {
	case anError
}

func someThrowingFunction() throws {
	guard Bool.random() else { throw SomeError.anError } /// For sake of example, `throw` on `false` values.
}

var subscriptions = Set<AnyCancellable>()

Result { try someThrowingFunction() }
	.publisher
	.sink(
		receiveCompletion: { completion in
			switch completion {
			case .finished:
				break
			case .failure:
				print("`someThrowingFunction` threw.")
			}
		},
		receiveValue: { print("`someThrowingFunction` didn’t error.") }
	)
	.store(in: &subscriptions)

PlaygroundPage.current.needsIndefiniteExecution = true