Using Swift concurrency async await within a checked continuation

nested-swift-async-await.swift

func doACoolAsyncThing() async -> Bool {
    return withCheckedContinuation { continuation in
        SomeAPI.oldSchoolContinuationHandler { result in
            if result {
                // Yay, success! But before we return at the parent level, 
                // check one more step, like ensuring iOS notification permissions
                //  are enabled
                Task {
                    // Whoa! Async await inside a continuation. Allowed?
                    // (Assume this step is somewhat expensive and ONLY relevant
                    // if the previous step's result is true)
                    let finalStep = await isThe50000thDigitOfPi9() 
                    continuation.returning(finalStep)
                } 
            } else {
                continuation.returning(false)
            }
        }
    }
}