Remove false positive from override hint (issue 27046)

pkg/analyzer/test/generated/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.hint_code_test;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source_io.dart';
@@ skipping 13 matching lines @@
 class HintCodeTest extends ResolverTestCase {
   @override
   void reset() {
     analysisContext2 = AnalysisContextFactory.contextWithCoreAndPackages({
       'package:meta/meta.dart': r'''
 library meta;
 
 const _Factory factory = const _Factory();
 const _Literal literal = const _Literal();
 const _MustCallSuper mustCallSuper = const _MustCallSuper();
-const _Override override = const _Override();
 const _Protected protected = const _Protected();
 const Required required = const Required();
 class Required {
   final String reason;
   const Required([this.reason]);
 }
 
 class _Factory {
   const _Factory();
 }
 class _Literal {
   const _Literal();
 }
 class _MustCallSuper {
   const _MustCallSuper();
 }
-class _Override {
-  const _Override();
-}
 class _Protected {
   const _Protected();
 }
 class _Required {
   final String reason;
   const _Required([this.reason]));
 }
 ''',
       'package:js/js.dart': r'''
 library js;
@@ skipping 1984 matching lines @@
 class A {
   bool operator ==(x) {}
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.OVERRIDE_EQUALS_BUT_NOT_HASH_CODE]);
     verify([source]);
   }
 
   void test_overrideOnNonOverridingField_invalid() {
     Source source = addSource(r'''
-library dart.core;
-const override = null;
 class A {
 }
 class B extends A {
   @override
   final int m = 1;
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.OVERRIDE_ON_NON_OVERRIDING_FIELD]);
     verify([source]);
   }
 
   void test_overrideOnNonOverridingGetter_invalid() {
     Source source = addSource(r'''
-library dart.core;
-const override = null;
 class A {
 }
 class B extends A {
   @override
   int get m => 1;
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.OVERRIDE_ON_NON_OVERRIDING_GETTER]);
     verify([source]);
   }
 
   void test_overrideOnNonOverridingMethod_invalid() {
     Source source = addSource(r'''
-library dart.core;
-const override = null;
 class A {
 }
 class B extends A {
   @override
   int m() => 1;
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.OVERRIDE_ON_NON_OVERRIDING_METHOD]);
     verify([source]);
   }
 
   void test_overrideOnNonOverridingSetter_invalid() {
     Source source = addSource(r'''
-library dart.core;
-const override = null;
 class A {
 }
 class B extends A {
   @override
   set m(int x) {}
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.OVERRIDE_ON_NON_OVERRIDING_SETTER]);
     verify([source]);
   }
@@ skipping 1810 matching lines @@
   n() {
     var a = m(), b = m();
   }
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(
         source, [HintCode.USE_OF_VOID_RESULT, HintCode.USE_OF_VOID_RESULT]);
     verify([source]);
   }
 }