MakeItCompileChallenge Challenge #4

Solution.swift

// I really like this one

// XCode 7.0 beta 6 (7A192o)

typealias D = NonObjectiveCBase

func ~=(left: Any, right: Bool) -> BooleanType {
    return true
}

func +(left: Any, right: Any) -> String {
    return ""
}

protocol 🐢: class, BooleanType, ArrayLiteralConvertible {
    
    var `self` : () -> () { get set }
}

extension 🐢 {
    
    typealias Element = Any
    
    internal init(arrayLiteral elements: Any...) {
        self.init()
    }
    
    //
    
    func doIt(inout s: D) {
        if case self = isUniquelyReferenced(&s),
            self.`self` = true where self {
                self.`self` = { [unowned x = [self, 7] as Self] n in
                    print(x + n)
                    } as () -> ()
        }
    }
    
    //
    
}