protocol FooProtocol {
    func blah()
}


struct Foo : FooProtocol {
    func blah() {}
}

struct FooTaker {
    init(inout aFoo: FooProtocol) {
        println("I got a foo! \(aFoo)")
    }
}

let x: FooProtocol? = Foo()
if var foo = x {
    FooTaker(aFoo: &foo)
}