   nsStr = nsMutableStr
 }
 
-func testObjCToCF(let nsStr: NSString, nsMutableStr: NSMutableString) {
+func testObjCToCF(nsStr: NSString, nsMutableStr: NSMutableString) {
   var cfStr: CFString = nsStr
   cfStr = nsMutableStr
 

import CoreFoundation
import Foundation

func testCFToObjC(let cfStr: CFString, cfMutableStr: CFMutableString) {
  var nsStr: NSString = cfStr
  nsStr = cfMutableStr


  var cfStr: CFString = str
  var cfMutableStr: CFMutableString = str // expected-error{{'NSString' is not a subtype of 'NSMutableString'}}
}

func testCFToAnyObject(cfStr: CFString, cfMutableStr: CFMutableString,
                       cfTree: CFTree) {
  var anyObject: AnyObject = cfStr
  anyObject = cfMutableStr
  anyObject = cfTree
}

func testAnyObjectToCF(anyObject: AnyObject) {
  var cfStr: CFString = anyObject as CFString
  var cfMutableStr: CFMutableString = anyObject as CFMutableString
  var cfTree: CFTree = anyObject as CFTree

  // No implicit conversions.
  cfStr = anyObject // expected-error{{type 'AnyObject' cannot be implicitly downcast to 'CFString'; did you mean to use 'as' to force downcast?}}
}

