// RUN: %target-swift-frontend %s -emit-ir

// REQUIRES: objc_interop

// Distributed under the terms of the MIT license
// Test case submitted to project by https://github.com/practicalswift (practicalswift)
// https://twitter.com/nuoji/status/507991706294558721
// https://gist.github.com/lerno/4cb4568c53045aafb66e

import Foundation
class A : NSObject {
    var c: (()->Bool)?
    deinit {
        print("A")
    }
}
class B : NSObject {
    var d = A()
    override init() {
        super.init()
        d.c = {
            [unowned self] in
            print("\(self)")
            return true
        }
    }
}
var e: B? = B()
var f: A? = e!.d
e = nil
f = nil