Remove unnecessary requirements from Signal[Producer]Protocol.

Author: andersio

Sources/Flatten.swift

@@ -594,8 +594,8 @@ extension Signal where Value: SignalProducerProtocol, Error == Value.Error {
 
 		return self.observe { event in
 			switch event {
-			case let .value(producer):
-				producer.startWithSignal { innerSignal, innerDisposable in
+			case let .value(p):
+				p.producer.startWithSignal { innerSignal, innerDisposable in
 					inFlight.modify { $0 += 1 }
 					let handle = disposable.add(innerDisposable)
 
@@ -715,8 +715,8 @@ extension Signal where Value: SignalProducerProtocol, Error == Value.Error {
 
 		return self.observe { event in
 			switch event {
-			case let .value(innerProducer):
-				innerProducer.startWithSignal { innerSignal, innerDisposable in
+			case let .value(p):
+				p.producer.startWithSignal { innerSignal, innerDisposable in
 					state.modify {
 						// When we replace the disposable below, this prevents
 						// the generated Interrupted event from doing any work.

Sources/Signal.swift

@@ -418,10 +418,6 @@ public protocol SignalProtocol {
 
 	/// Extracts a signal from the receiver.
 	var signal: Signal<Value, Error> { get }
-
-	/// Observes the Signal by sending any future events to the given observer.
-	@discardableResult
-	func observe(_ observer: Signal<Value, Error>.Observer) -> Disposable?
 }
 
 extension Signal: SignalProtocol {

Sources/SignalProducer.swift

@@ -195,13 +195,6 @@ public protocol SignalProducerProtocol {
 
 	/// Extracts a signal producer from the receiver.
 	var producer: SignalProducer<Value, Error> { get }
-
-	/// Initialize a signal
-	init(_ startHandler: @escaping (Signal<Value, Error>.Observer, CompositeDisposable) -> Void)
-
-	/// Creates a Signal from the producer, passes it into the given closure,
-	/// then starts sending events on the Signal when the closure has returned.
-	func startWithSignal(_ setup: (_ signal: Signal<Value, Error>, _ interrupter: Disposable) -> Void)
 }
 
 extension SignalProducer: SignalProducerProtocol {