[SE-0112] Make userInfo accessible via [String : AnyObject] on imported NSErrors.

Author: DougGregor

stdlib/public/SDK/Foundation/NSError.swift

@@ -400,6 +400,10 @@ public extension _BridgedStoredNSError
                                 code: numericCast(code.rawValue),
                                 userInfo: userInfo))
   }
+
+  /// The user-info dictionary for an error that was bridged from
+  /// NSError.
+  var userInfo: [String : AnyObject] { return errorUserInfo }
 }
 
 /// Various helper implementations for _BridgedStoredNSError

test/1_stdlib/ErrorBridged.swift

@@ -177,6 +177,7 @@ ErrorBridgingTests.test("NSError-to-enum bridging") {
     case let error as CLError:
       isCLError = true
       expectOptionalEqual(testURL, (error as NSError).userInfo[NSURLErrorKey] as? URL)
+      expectOptionalEqual(testURL, error.userInfo[NSURLErrorKey] as? URL)
     default:
       isCLError = false
     }