Replace withUnsafeContinuation with withCheckedContinuation in pendingWorkComplete

Sources/Examples/DispatchQueue+PendingWork.swift

@@ -3,8 +3,7 @@ import Dispatch
 extension DispatchQueue {
     /// Returns once any pending work has been completed.
     func pendingWorkComplete() async {
-        // TODO: update to withCheckedContinuation https://github.com/apple/swift/issues/74206
-        await withUnsafeContinuation { continuation in
+        await withCheckedContinuation { continuation in
             self.async(flags: .barrier) {
                 continuation.resume()
             }

Tests/Examples/DispatchQueuePendingWorkTests.swift

@@ -0,0 +1,24 @@
+import XCTest
+
+final class DispatchQueuePendingWorkTests: XCTestCase {
+    func testPendingWorkCompleteRunsAfterAsyncBlock() async {
+        let queue = DispatchQueue(label: "test.queue", attributes: .concurrent)
+        let expectation = XCTestExpectation(description: "Work finished")
+        var value = 0
+
+        // Enqueue some async work on the queue
+        queue.async {
+            value = 42
+            expectation.fulfill()
+        }
+
+        // Wait until the queue says all prior work has completed
+        await queue.pendingWorkComplete()
+
+        // At this point, value should be updated
+        XCTAssertEqual(value, 42)
+
+        // Make sure the async block really executed
+        wait(for: [expectation], timeout: 1.0)
+    }
+}