En Xcode 6.1, las enumeracionestoRaw yfromRaw las funciones ya no funcionan:

enum TestEnum : String {
    case A = "a"
    case B = "b"
}

if let a = TestEnum.fromRaw("a") {
    prinln(a.toRaw())
}

Errores:

'TestEnum' does not have a member named 'toRaw'
'TestEnum.Type' does not have a member named 'fromRaw'