Fix recover fail with cancelled promise

DemoApp/ViewController.swift

@@ -27,21 +27,7 @@ class ViewController: UIViewController {
 
 	override func viewDidAppear(_ animated: Bool) {
 		super.viewDidAppear(animated)
-		let invalidator: InvalidationToken = InvalidationToken()
-
-		let x = async(token: invalidator, { st -> String in
-			Thread.sleep(forTimeInterval: 2.0)
-			if st.isCancelled {
-				print("cancelled")
-			} else {
-				print("opened")
-			}
-			return "x"
-		}).then { x in
-				print("x")
-		}
-		invalidator.invalidate()
 	}
-	
+
 }
 

Sources/Hydra/Promise+Retry.swift

@@ -48,11 +48,12 @@ public extension Promise {
 			return Promise<Value>(rejected: PromiseError.invalidInput)
 		}
 
+		var innerPromise: Promise<Value>? = nil
 		var remainingAttempts = attempts
 		// We'll create a next promise which will be resolved when attempts to resolve self (source promise)
 		// is reached (with a fulfill or a rejection).
 		let nextPromise = Promise<Value>(in: self.context, token: self.invalidationToken) { (resolve, reject, operation) in
-			let innerPromise = self.recover(in: self.context) { [unowned self] (error) -> (Promise<Value>) in
+			innerPromise = self.recover(in: self.context) { [unowned self] (error) -> (Promise<Value>) in
 				// If promise is rejected we'll decrement the attempts counter
 				remainingAttempts -= 1
 				guard remainingAttempts >= 1 else {
@@ -83,8 +84,8 @@ public extension Promise {
 			let onCancel = Observer.onCancel(self.context, operation.cancel)
 
 			// Observe changes from source promise
-			innerPromise.add(observers: onResolve, onReject, onCancel)
-			innerPromise.runBody()
+			innerPromise?.add(observers: onResolve, onReject, onCancel)
+			innerPromise?.runBody()
 		}
 		nextPromise.runBody()
 		return nextPromise