enhanced enums support for `unnecessary_overrides`

[pq]

[pq]

  test_field() async {
    await assertDiagnostics(r'''
enum A {
  a,b,c;
  @override
  int get foo => 0;
}
''', [
      lint('unnecessary_overrides', 28, 8),
    ]);
  }

failing w/

package:analyzer/src/dart/analysis/driver.dart 1476:9             AnalysisDriver._computeAnalysisResult.<fn>
package:analyzer/src/dart/analysis/performance_logger.dart 32:15  PerformanceLog.run
package:analyzer/src/dart/analysis/driver.dart 1424:20            AnalysisDriver._computeAnalysisResult
package:analyzer/src/dart/analysis/driver.dart 1050:22            AnalysisDriver.performWork
package:analyzer/src/dart/analysis/driver.dart 2127:24            AnalysisDriverScheduler._run

Null check operator used on a null value
#0      AnnotationResolver._resolve (package:analyzer/src/dart/resolver/annotation_resolver.dart:309:43)
dart-lang/sdk#57147      AnnotationResolver.resolve (package:analyzer/src/dart/resolver/annotation_resolver.dart:34:5)
dart-lang/sdk#57148      ResolverVisitor.visitAnnotation (package:analyzer/src/generated/resolver.dart:1074:25)
dart-lang/sdk#57149      AnnotationImpl.accept (package:analyzer/src/dart/ast/ast.dart:297:50)
dart-lang/sdk#57150      NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7813:20)
dart-lang/sdk#57151      AnnotatedNodeImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:144:17)
dart-lang/sdk#57152      MethodDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:7181:11)
dart-lang/sdk#57153      ResolverVisitor.visitNode (package:analyzer/src/generated/resolver.dart:1931:10)
dart-lang/sdk#57154      UnifyingAstVisitor.visitMethodDeclaration (package:analyzer/dart/ast/visitor.dart:3561:56)
dart-lang/sdk#57155      ResolverVisitor.visitMethodDeclaration (package:analyzer/src/generated/resolver.dart:1834:13)
dart-lang/sdk#57156     MethodDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:7177:50)
dart-lang/sdk#57157     NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7813:20)
dart-lang/sdk#57158     EnumDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:3415:14)
dart-lang/sdk#57159     ResolverVisitor.visitNode (package:analyzer/src/generated/resolver.dart:1931:10)
dart-lang/sdk#57160     UnifyingAstVisitor.visitEnumDeclaration (package:analyzer/dart/ast/visitor.dart:3419:52)
dart-lang/sdk#57161     ResolverVisitor.visitEnumDeclaration (package:analyzer/src/generated/resolver.dart:1502:13)
dart-lang/sdk#57162     EnumDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:3405:50)
dart-lang/sdk#57163     ResolverVisitor.visitCompilationUnit (package:analyzer/src/generated/resolver.dart:1314:23)
dart-lang/sdk#57164     CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:2098:50)
dart-lang/sdk#57165     LibraryAnalyzer._resolveFile (package:analyzer/src/dart/analysis/library_analyzer.dart:779:10)
dart-lang/sdk#57166     LibraryAnalyzer._parseAndResolve.<anonymous closure> (package:analyzer/src/dart/analysis/library_analyzer.dart:597:7)
dart-lang/sdk#57167     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:574:13)
dart-lang/sdk#57168     LibraryAnalyzer._parseAndResolve (package:analyzer/src/dart/analysis/library_analyzer.dart:596:11)
dart-lang/sdk#57169     LibraryAnalyzer.analyze (package:analyzer/src/dart/analysis/library_analyzer.dart:105:17)
dart-lang/sdk#57170     AnalysisDriver._computeAnalysisResult.<anonymous closure> (package:analyzer/src/dart/analysis/driver.dart:1447:11)
dart-lang/sdk#57171     PerformanceLog.run (package:analyzer/src/dart/analysis/performance_logger.dart:32:15)
dart-lang/sdk#57172     AnalysisDriver._computeAnalysisResult (package:analyzer/src/dart/analysis/driver.dart:1424:20)
dart-lang/sdk#57173     AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1050:22)
dart-lang/sdk#57174     AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2127:24)
<asynchronous suspension>

[scheglov]

Do you use the bleeding edge analyzer? I can run this test without a crash (it fails).

  test_X() async {
    await assertNoErrorsInCode(r'''
enum A {
  a,b,c;
  @override
  int get foo => 0;
}
''');
  }

[pq]

Ah, yes. sorry, should have added that. I see a failure on bleeding edge (but no crash) too.