Merge pull request #1595 from rauhul/fix_open_let_properties

Author: swift-ci

Foundation/NSURL.swift

@@ -955,8 +955,8 @@ open class NSURLQueryItem : NSObject, NSSecureCoding, NSCopying {
                     && other.value == self.value)
     }
 
-    open let name: String
-    open let value: String?
+    open private(set) var name: String
+    open private(set) var value: String?
 }
 
 open class NSURLComponents: NSObject, NSCopying {

Foundation/URLSession/URLSession.swift

@@ -265,9 +265,9 @@ open class URLSession : NSObject {
         let _ = URLSession.registerProtocols
     }
 
-    open let delegateQueue: OperationQueue
+    open private(set) var delegateQueue: OperationQueue
     open var delegate: URLSessionDelegate?
-    open let configuration: URLSessionConfiguration
+    open private(set) var configuration: URLSessionConfiguration
 
     /*
      * The sessionDescription property is available for the developer to

Foundation/URLSession/URLSessionTask.swift

@@ -102,10 +102,10 @@ open class URLSessionTask : NSObject, NSCopying {
     }
 
     /// An identifier for this task, assigned by and unique to the owning session
-    open let taskIdentifier: Int
+    open private(set) var taskIdentifier: Int
 
     /// May be nil if this is a stream task
-    /*@NSCopying*/ open let originalRequest: URLRequest?
+    /*@NSCopying*/ open private(set) var originalRequest: URLRequest?
 
     /// May differ from originalRequest due to http server redirection
     /*@NSCopying*/ open internal(set) var currentRequest: URLRequest? {