[Concurrency] Stubs for Task.current()

Author: ktoso

stdlib/public/Concurrency/Task.swift

@@ -28,6 +28,19 @@ import Swift
 public struct Task {
 }
 
+// ==== Current Task -----------------------------------------------------------
+
+extension Task {
+  /// Returns the currently executing `Task`.
+  ///
+  /// As invoking this function is only possible from an asynchronous context
+  /// it is always able to return the current `Task` in which we are currently
+  /// running.
+  public static func current() async -> Task {
+    fatalError("\(#function) not implemented yet.")
+  }
+}
+
 // ==== Task Priority ----------------------------------------------------------
 
 extension Task {

test/Concurrency/async_tasks.swift

@@ -62,3 +62,13 @@ func test_detached_throwing() async -> String {
     print("caught: \(error)")
   }
 }
+
+// ==== Current Task -----------------------------------------------------------
+
+func test_current_task() async {
+    let task = await Task.current() // yay, we know "in" what task we're executing
+}
+
+func test_current_task_notasync() {
+    let task = Task.current()
+}