change DispatchSource protocol in Wrapper to match extension prototypes in Source.swift

Author: dgrove-oss

src/swift/Source.swift

@@ -13,7 +13,6 @@
 import CDispatch
 
 public extension DispatchSourceType {
-	typealias DispatchSourceHandler = @convention(block) () -> Void
 
 	public func setEventHandler(qos: DispatchQoS = .unspecified, flags: DispatchWorkItemFlags = [], handler: DispatchSourceHandler?) {
 		if #available(OSX 10.10, iOS 8.0, *), let h = handler where qos != .unspecified || !flags.isEmpty {

src/swift/Wrapper.swift

@@ -167,16 +167,21 @@ extension DispatchSource : DispatchSourceProcess,
 }
 #endif
 
+public typealias DispatchSourceHandler = @convention(block) () -> Void
+
 public protocol DispatchSourceType {
-#if false /* FIXME: crashes the swift compiler */
-	typealias DispatchSourceHandler = @convention(block) () -> Void
+	func setEventHandler(qos: DispatchQoS, flags: DispatchWorkItemFlags, handler: DispatchSourceHandler?)
 
-	func setEventHandler(handler: DispatchSourceHandler?)
+	func setEventHandler(handler: DispatchWorkItem)
 
-	func setCancelHandler(handler: DispatchSourceHandler?)
+	func setCancelHandler(qos: DispatchQoS, flags: DispatchWorkItemFlags, handler: DispatchSourceHandler?)
+
+	func setCancelHandler(handler: DispatchWorkItem)
+
+	func setRegistrationHandler(qos: DispatchQoS, flags: DispatchWorkItemFlags, handler: DispatchSourceHandler?)
+
+	func setRegistrationHandler(handler: DispatchWorkItem)
 
-	func setRegistrationHandler(handler: DispatchSourceHandler?)
-#endif
 	func cancel()
 
 	func resume()