Swift optional chaining doesn't work in closure

Question

My code looks like this. My class has an optional var

var currentBottle : BottleLayer?

BottleLayer has a method jiggle().

Answer 1

let closure = { () -> () in
    self.currentBottle?.jiggle()
    return
}

Otherwise the compiler thinks the result of that statement should be returned from the closure and it realizes there is a mismatch between () (return type) and the optional returned by the statement (Optional). By adding an explicit return, the compiler will know that we don't want to return anything.

The error message is wrong, of course.