[Concurrency] Additional test for task group body isolation inheritance

Author: ktoso

test/Concurrency/async_task_group_body_inherit_isolation.swift

@@ -0,0 +1,27 @@
+// RUN: %target-swift-frontend -emit-sil -verify -o /dev/null -disable-availability-checking %s -swift-version 6 -strict-concurrency=complete
+
+// REQUIRES: concurrency
+// REQUIRES: asserts
+
+actor A {
+  func g() { }
+  func h() throws { }
+  
+  func f() async throws {
+    await withTaskGroup(of: Int.self, returning: Void.self) { group in
+      self.g()
+    }
+
+    try await withThrowingTaskGroup(of: String.self, returning: Void.self) { group in
+      try self.h()
+    }
+
+    await withDiscardingTaskGroup(returning: Void.self) { group in
+      self.g()
+    }
+
+    try await withThrowingDiscardingTaskGroup(returning: Void.self) { group in
+      try self.h()
+    }
+  }
+}