[Foundation] Make CocoaError.Code and URLError.Code Hashable.

stdlib/public/SDK/Foundation/NSError.swift

@@ -602,14 +602,18 @@ public struct CocoaError : _BridgedStoredNSError {
   public static var _nsErrorDomain: String { return NSCocoaErrorDomain }
 
   /// The error code itself.
-  public struct Code : RawRepresentable, _ErrorCodeProtocol {
+  public struct Code : RawRepresentable, Hashable, _ErrorCodeProtocol {
     public typealias _ErrorType = CocoaError
 
     public let rawValue: Int
 
     public init(rawValue: Int) {
       self.rawValue = rawValue
     }
+
+    public var hashValue: Int {
+      return self.rawValue
+    }
   }
 }
 
@@ -1845,14 +1849,18 @@ public struct URLError : _BridgedStoredNSError {
   public static var _nsErrorDomain: String { return NSURLErrorDomain }
 
   /// The error code itself.
-  public struct Code : RawRepresentable, _ErrorCodeProtocol {
+  public struct Code : RawRepresentable, Hashable, _ErrorCodeProtocol {
     public typealias _ErrorType = URLError
 
     public let rawValue: Int
 
     public init(rawValue: Int) {
       self.rawValue = rawValue
     }
+
+    public var hashValue: Int {
+      return self.rawValue
+    }
   }
 }
 

test/stdlib/NSError.swift

@@ -53,4 +53,9 @@ tests.test("convenience") {
     expectEqual("bar", (error3 as NSError).userInfo["foo"] as? String)
 }
 
+tests.test("Hashable") {
+  checkHashable([CocoaError.Code.fileNoSuchFile, .fileReadUnknown, .keyValueValidation], equalityOracle: { $0 == $1 })
+  checkHashable([URLError.Code.unknown, .cancelled, .badURL], equalityOracle: { $0 == $1 })
+}
+
 runAllTests()