Merge pull request #73564 from ktoso/wip-extra-test

Author: ktoso

test/Concurrency/Runtime/actor_assert_precondition_executor_checkIsolated_dispatch_dispatchMain.swift

@@ -0,0 +1,46 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift -Xfrontend -disable-availability-checking %import-libdispatch -parse-as-library %s -o %t/a.out
+// RUN: %target-codesign %t/a.out
+// RUN:  %target-run %t/a.out
+
+// REQUIRES: executable_test
+// REQUIRES: concurrency
+// REQUIRES: concurrency_runtime
+
+// REQUIRES: libdispatch
+
+// UNSUPPORTED: back_deployment_runtime
+// UNSUPPORTED: back_deploy_concurrency
+// UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: freestanding
+
+import Dispatch
+
+#if os(macOS)
+import Darwin
+#elseif canImport(Glibc)
+import Glibc
+#elseif canImport(Musl)
+import Musl
+#endif
+
+@main struct Main {
+  static func main() {
+    if #available(SwiftStdlib 6.0, *) {
+
+      Swift.print("start detached")
+      Task.detached {
+        Swift.print("DispatchQueue.main.async { MainActor.precondition }")
+
+        DispatchQueue.main.async {
+          MainActor.preconditionIsolated("I know I'm on the main queue")
+
+          Swift.print("OK")
+          exit(0)
+        }
+      }
+
+      dispatchMain()
+    }
+  }
+}