import CoreData

@objc class Or: NSObject{
    var i=1
}

func ==(lhs: Or, rhs: Or) -> Bool {
    return lhs.i == rhs.i
}

@objc(Order)
class Order: NSManagedObject {
    @NSManaged var orderItems: Set<Or> //error: Cannot specialize non-generic type 'Set'
}


var i = Order()