create SignalProducer that create Future with the autoclosure on start and send a result to the inner observer

SignalProducerFromFuture.swift

extension SignalProducer {
    // create SignalProducer that create Future with the autoclosure on start and send a result to the inner observer
    init(_ future: @escaping @autoclosure () -> Future<Value, Error>) {
        self.init { observer, _ in
            future()
                .onSuccess {
                    observer.send(value: $0)
                    observer.sendCompleted()}
                .onFailure {
                    observer.send(error: $0)}
        }
    }
}