How to call static method provided by protocol in Swift

This looks like a bug or a non-supported feature. I would expect that the following works:

if let gsType = contact.dynamicType as? GroupStatus.Type {
    if gsType.isPrivate() {
        // ...
    }
}

However, it does not compile:

error: accessing members of protocol type value 'GroupStatus.Type' is unimplemented

It does compile with FamilyContact.Type instead of GroupStatus.Type. A similar problem is reported here:

• Swift 1.1 and 1.2: accessing members of protocol type value XXX.Type' is unimplemented

Making isPrivate() an instance method instead of a class method is the only workaround that I currently can think of, maybe someone comes with a better solution ...

Update for Swift 2 / Xcode 7: As @Tankista noted below, this has been fixed. The above code compiles and works as expected in Xcode 7 beta 3.