diff --git a/analysis_options.yaml b/analysis_options.yaml
index 49eb4d014..9f2ba5e67 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -1,9 +1,5 @@
-# Specify analysis options.
-#
-# This file is a copy of analysis_options.yaml from flutter repo
-# as of 2023-12-18, but with some modifications marked with
-# "DIFFERENT FROM FLUTTER/FLUTTER" below. The file is expected to
-# be kept in sync with the master file from the flutter repo.
+# This file is a copy of analysis_options.yaml from flutter/packages repo
+# as of 2024-03-07.
 
 analyzer:
   language:
diff --git a/packages/messageport/example/integration_test/messageport_test.dart b/packages/messageport/example/integration_test/messageport_test.dart
index efdca5a1d..70cb0f2a8 100644
--- a/packages/messageport/example/integration_test/messageport_test.dart
+++ b/packages/messageport/example/integration_test/messageport_test.dart
@@ -26,7 +26,7 @@ void main() {
 
   testWidgets('Create remote port', (WidgetTester tester) async {
     final LocalPort localPort = await LocalPort.create(kTestPort);
-    localPort.register((dynamic message, [RemotePort? remotePort]) => () {});
+    localPort.register((dynamic message, [RemotePort? remotePort]) {});
 
     final RemotePort remotePort =
         await RemotePort.connect(kTestAppId, kTestPort);
@@ -40,7 +40,7 @@ void main() {
       (WidgetTester tester) async {
     final LocalPort localPort =
         await LocalPort.create(kTestPort, trusted: false);
-    localPort.register((dynamic message, [RemotePort? remotePort]) => () {});
+    localPort.register((dynamic message, [RemotePort? remotePort]) {});
 
     await expectLater(
       () => RemotePort.connect(kTestAppId, kTestPort),
@@ -52,7 +52,7 @@ void main() {
 
   testWidgets('Check for remote', (WidgetTester tester) async {
     final LocalPort localPort = await LocalPort.create(kTestPort);
-    localPort.register((dynamic message, [RemotePort? remotePort]) => () {});
+    localPort.register((dynamic message, [RemotePort? remotePort]) {});
 
     final RemotePort remotePort =
         await RemotePort.connect(kTestAppId, kTestPort);