@swift-5.7.3
import Foundation @MainActor func run(action: @escaping @Sendable () -> Void) async { print("1") print(Thread.isMainThread) action() } Task { await run { print("action") print(Thread.isMainThread) } print("2") print(Thread.isMainThread) } RunLoop.main.run(until: Date().addingTimeInterval(0.3))