Issue 28027. Move Null to the bottom in the Analyzer.

pkg/analyzer/test/generated/non_hint_code_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.generated.non_hint_code_test;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'resolver_test_case.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(NonHintCodeTest);
   });
 }
 
 @reflectiveTest
 class NonHintCodeTest extends ResolverTestCase {
+  test_async_future_object_without_return() async {
+    Source source = addSource('''
+import 'dart:async';
+Future<Object> f() async {}
+''');
+    await computeAnalysisResult(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   test_deadCode_afterTryCatch() async {
     Source source = addSource('''
 main() {
   try {
     return f();
   } catch (e) {
     print(e);
   }
   print('not dead');
 }
@@ skipping 1328 matching lines @@
 
   test_import_valid_outside_lib() async {
     addNamedSource("/myproj/pubspec.yaml", "");
     addNamedSource("/myproj/web/other.dart", "");
     Source source =
         addNamedSource("/myproj/lib2/test.dart", "import '../web/other.dart';");
     await computeAnalysisResult(source);
     assertNoErrors(source);
   }
 }