make (normal) task group "dont leak" test use leaks and enable by default

Author: ktoso

test/Concurrency/Runtime/async_taskgroup_dontLeakTasks.swift

@@ -1,52 +1,39 @@
-// RUN: %target-run-simple-swift( -Xfrontend -disable-availability-checking -parse-as-library) 2>&1 | %FileCheck %s --dump-input=always
+// RUN: %target-run-simple-leaks-swift( -Xfrontend -disable-availability-checking -parse-as-library)
+
+// This test uses `leaks` which is only available on apple platforms; limit it to macOS:
+// REQUIRES: OS=macosx
+
 // REQUIRES: executable_test
 // REQUIRES: concurrency
-// REQUIRES: swift_task_debug_log
 
 // REQUIRES: concurrency_runtime
 // UNSUPPORTED: back_deployment_runtime
 
-#if os(Linux)
-import Glibc
-#elseif os(Windows)
-import MSVCRT
-#else
 import Darwin
-#endif
+
+final class Something {
+  let int: Int
+  init(int: Int) {
+    self.int = int
+  }
+}
 
 func test_taskGroup_next() async {
-  // CHECK: creating task [[MAIN_TASK:0x.*]] with parent 0x0
-  // CHECK: creating task [[GROUP_TASK_1:0x.*]] with parent [[MAIN_TASK]]
-  // CHECK: creating task [[GROUP_TASK_2:0x.*]] with parent [[MAIN_TASK]]
-  // CHECK: creating task [[GROUP_TASK_3:0x.*]] with parent [[MAIN_TASK]]
-  // CHECK: creating task [[GROUP_TASK_4:0x.*]] with parent [[MAIN_TASK]]
-  // CHECK: creating task [[GROUP_TASK_5:0x.*]] with parent [[MAIN_TASK]]
-
-  _ = await withTaskGroup(of: Int.self, returning: Int.self) { group in
-    for n in 0..<5 {
+  let tasks = 5
+  _ = await withTaskGroup(of: Something.self, returning: Int.self) { group in
+    for n in 0..<tasks {
       group.spawn {
-        return n
+        Something(int: n)
       }
     }
-    await Task.sleep(2_000_000)
 
     var sum = 0
     for await value in group {
-      sum += 1
+      sum += value.int
     }
 
     return sum
   }
-  // as we exit the group, it must be guaranteed that its child tasks were destroyed
-  //
-  // NOTE: there is no great way to express "any of GROUP_TASK_n",
-  //       so we just check that 5 tasks were destroyed
-  //
-  // CHECK: destroy task [[DESTROY_GROUP_TASK_1:0x.*]]
-  // CHECK: destroy task [[DESTROY_GROUP_TASK_2:0x.*]]
-  // CHECK: destroy task [[DESTROY_GROUP_TASK_3:0x.*]]
-  // CHECK: destroy task [[DESTROY_GROUP_TASK_4:0x.*]]
-  // CHECK: destroy task [[DESTROY_GROUP_TASK_5:0x.*]]
 }
 
 @main struct Main {