Strange Swift 2.0 Bug, Crash when source code is in separate file

I have the following code.

ViewController.Swift

class ViewController: UIViewController {
    override func viewDidLoad() {
        let someClass = Test()
        someClass.someProtocol.someMethod()
    }
}

Code.Swift

protocol SomeProtocol {
    var someInt: Int {get set}
    func someMethod()
}
class SomeClass: SomeProtocol {
    var someInt: Int
    init() {
        someInt = Int()
    }
    func someMethod() {
        print("hello")
    }
}
class Test {
    let someProtocol: SomeProtocol
    init() {
        self.someProtocol = SomeClass()
    }
}

This code compiles completely fine on Xcode 6/Swift 1.2, but in Xcode 7/Swift 2

someMethod

EXC_BAD_ACCESS

someInt

However if I move the code from Code.Swift to the ViewController.Swift file (so that all the source code is in the same file) I don't get a crash.

Has anyone experienced this issue with Swift 2 or know why this is happening? By the way I'm running Xcode 7 beta 2

Thanks