Merge pull request #765 from ikesyo/urlsessionstreamtask-updates

Author: swift-ci

Foundation/NSURLSession/NSURLSessionTask.swift

@@ -1185,14 +1185,14 @@ open class URLSessionStreamTask : URLSessionTask {
      * If an error occurs, any outstanding reads will also fail, and new
      * read requests will error out immediately.
      */
-    open func readData(ofMinLength minBytes: Int, maxLength maxBytes: Int, timeout: TimeInterval, completionHandler: (NSData?, Bool, NSError?) -> Void) { NSUnimplemented() }
+    open func readData(ofMinLength minBytes: Int, maxLength maxBytes: Int, timeout: TimeInterval, completionHandler: @escaping (Data?, Bool, Error?) -> Void) { NSUnimplemented() }
 
     /* Write the data completely to the underlying socket.  If all the
      * bytes have not been written by the timeout, a timeout error will
      * occur.  Note that invocation of the completion handler does not
      * guarantee that the remote side has received all the bytes, only
      * that they have been written to the kernel. */
-    open func write(data: NSData, timeout: TimeInterval, completionHandler: (NSError?) -> Void) { NSUnimplemented() }
+    open func write(_ data: Data, timeout: TimeInterval, completionHandler: @escaping (Error?) -> Void) { NSUnimplemented() }
 
     /* -captureStreams completes any already enqueued reads
      * and writes, and then invokes the