Swift optional binding with tuples

Question

I'm trying to use a tuple as an optional binding in an IF statement in Swift but it won't compile and that error message is less than helpful. Why doesn't the following compile?

let user:String? = "billy"
let pass:String? = "password"

if let test = (user?,pass?){
    print("this works")
}

or this

let user:String? = "billy"
let pass:String? = "password"

if let test = (user,pass){
    print("this works")
}

Answer 1

edit: as of Swift 1.2 in Xcode 6.3, you can now do:

if let user = user, pass = pass { }

to bind multiple unwrapped optional values.

You can't use optional let binding that way. let test = (user,pass) won't compile since (user,pass) is not an optional – it's a tuple that contains optionals. That is, it's an (Int?,Int?) not an (Int,Int)?.

This should do what you want and allows you to bind two items simultaneously:

switch (user, pass) {
    case let (.Some(user), .Some(pass)):
        print("this works: \(user), \(pass)")
    default: ()  // must handle all cases
}