import CoreData
import Foundation
import UIKit

protocol PickerItemProvider: class {
    associatedtype PickerType

    func itemAt(_ indexPath: IndexPath) -> PickerType?
}

class FetchedPickerProvider<ProvidedType: NSManagedObject>: PickerItemProvider {
    typealias PickerType = ProvidedType

    func itemAt(_ indexPath: IndexPath) -> ProvidedType? {
        return nil
    }
}

class GeneralPickerViewController<ItemProvider: PickerItemProvider>: UIViewController where ItemProvider.PickerType: Equatable {
    var itemProvider: ItemProvider?

    var selectedItems = [ItemProvider.PickerType]() // <--- If I remove this line, lldb doesn’t crash.

    override func viewDidLoad() {
        super.viewDidLoad()

        print("test") // <--- Set your breakpoint on this line.
    }
}