Casting ErrorType to Custom ErrorType

enum SvcError: ErrorType {
    case Bla
    case Blo
    case Code(Int)
}


let e: ErrorType = SvcError.Code(3)


print(e)

if e is SvcError {
    
    if let svcError = e as? SvcError, case let .Code(c) = svcError {
        print(c)
    }
}