bug.swift

import Foundation
import XCTest

enum AnError: Error {
    case boom
}

class LogCrashTest: XCTestCase {
    func testUnderlyingSwiftError() {
        let userInfo: [String: Any] = [
            NSUnderlyingErrorKey: AnError.boom,
            NSLocalizedDescriptionKey: "Hello",
        ]

        let nsError = NSError(domain: "Error", code: 0, userInfo: userInfo)
        let swiftError = nsError as Error

        // Crashes with -[_SwiftValue userInfo]: unrecognized selector sent to instance
        print("Error: \(swiftError)")
    }
}