Open Radar

 
Summary:
An object that associated to `NSTaggedPointerString` by `objc_setAssociatedObject()` is not released on OS X 10.11.2 (15C50)

Steps to Reproduce:
1. Create OS X Playground on Xcode
2. Paste following code to Playground:
```
import Foundation

let assockey = ""

do {
    class Canary {
        deinit {
            print("deinit")
        }
    }
    
    let longerNSString = NSString(format: "longerNSString %d", 1)
    print(longerNSString.dynamicType) // "_NSCFString\n"
    objc_setAssociatedObject(longerNSString, assockey, Canary(), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}

do {
    class Canary {
        deinit {
            print("deinit")
        }
    }
    
    let shorterNSString = NSString(format: "%d", 1)
    print(shorterNSString.dynamicType) // "NSTaggedPointerString\n"
    objc_setAssociatedObject(shorterNSString, assockey, Canary(), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
```


Expected Results:
3. following will be displayed on console:
```
__NSCFString
deinit
NSTaggedPointerString
deist
```

Actual Results:
3. following was displayed on console:
```
__NSCFString
deinit
NSTaggedPointerString
```

Version:
Xcode 7.2 (7C68) & OS X 10.11.2 (15C50)

Notes:


Configuration:


MacBook Pro (Retina, 13-inch, Late 2013) w: OS X OS X 10.11.2 (15C50).spx - configuration file has been successfully uploaded.

Attachments:
'MacBook Pro (Retina, 13-inch, Late 2013) w: OS X OS X 10.11.2 (15C50).spx' was successfully uploaded.