Issue 27300. Report HintCode.ABSTRACT_SUPER_MEMBER_REFERENCE. (Land again)

pkg/analysis_server/test/integration/analysis/error_test.dart

 // Copyright (c) 2014, 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 test.integration.analysis.error;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
@@ skipping 27 matching lines @@
 
   test_super_mixins_disabled() async {
     String pathname = sourcePath('test.dart');
     writeFile(
         pathname,
         '''
 class Test extends Object with C {
   void foo() {}
 }
 abstract class B {
-  void foo();
+  void foo() {}
 }
 abstract class C extends B {
   void bar() {
     super.foo();
   }
 }
 ''');
     standardAnalysisSetup();
     await analysisFinished;
     expect(currentAnalysisErrors[pathname], isList);
@@ skipping 13 matching lines @@
 
   test_super_mixins_enabled() async {
     String pathname = sourcePath('test.dart');
     writeFile(
         pathname,
         '''
 class Test extends Object with C {
   void foo() {}
 }
 abstract class B {
-  void foo();
+  void foo() {}
 }
 abstract class C extends B {
   void bar() {
     super.foo();
   }
 }
 ''');
     await sendAnalysisUpdateOptions(
         new AnalysisOptions()..enableSuperMixins = true);
     standardAnalysisSetup();
     await analysisFinished;
     expect(currentAnalysisErrors[pathname], isList);
     List<AnalysisError> errors = currentAnalysisErrors[pathname];
     expect(errors, isEmpty);
   }
 }