Index EnumDeclaration definitions as top-level elements.

pkg/analysis_server/test/services/index/dart_index_contributor_test.dart

Index: pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
index f0b26947aa8f1c50969e09df68c9510bfc96fc9f..0f7d336417d43171023593307806f107a52855b6 100644
--- a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
+++ b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
@@ -298,6 +298,16 @@ main(a) {
         _expectedLocation(classElement, 'A {}'));
   }
 
+  void test_definesClassEnum() {
+    _indexTestUnit('enum MyEnum {A, B, c}');
+    // prepare elements
+    ClassElement classElement = findElement("MyEnum");
+    // verify
+    _assertDefinesTopLevelElement(
+        IndexConstants.DEFINES,
+        _expectedLocation(classElement, 'MyEnum {'));
+  }
+
   void test_definesClassAlias() {
     _indexTestUnit('''
 class Mix {}