The following simple function will cause Xcode 12E262 to have "Abort: trap 6"

The following simple function will cause Xcode 12E262 to have "Abort: trap 6" during compilation.

import UIKit
import CoreData


class ViewController: UIViewController {

    func xyz() {
        let container = NSPersistentContainer(name: "xyz")

        let batchUpdateRequest = NSBatchUpdateRequest(entityName: "xyz")

        let batchUpdateResult = try! container.viewContext.execute(batchUpdateRequest) as? NSBatchUpdateResult

        guard let batchUpdateResult = batchUpdateResult else { return }

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
}

We will not observe "Abort: trap 6", if under Build Settings, we are using "Optimize for Speed" in Debug, instead of "No Optimization"

We can also avoid "Abort: trap 6", if we change the following code

guard let batchUpdateResult = batchUpdateResult else { return }

to

guard let batchUpdateResult2 = batchUpdateResult else { return }

May I know, why is it so?

A simpler code example to reproduce problem, without CoreData would be

import UIKit

class ViewController: UIViewController {

    func getAny() throws -> Any? {
        return nil
    }

    func xyz() {
        let name = try! getAny() as? UIViewController
        guard let name = name else { return }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
}