//: Playground - noun: a place where people can play

import UIKit

class Test {
    public var call: (() -> ())? = nil
    public init() {
        self.call = { [weak self] in
            guard let `self` = self else { return print("No self") }
            print(String(describing: self))
        }
    }
}

var str = "Hello, playground"
var test: Test? = Test()
weak var test2 = test
var call = (test?.call)!

test?.call?() ?? print("No Test instance")
test = nil
call() ?? print("No Test instance")
test2?.call?() ?? print("No Test instance")