Fix for indexing synthetic enum fields.

pkg/analyzer/lib/src/summary/index_unit.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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/member.dart';
@@ skipping 191 matching lines @@
     IndexSyntheticElementKind kind = IndexSyntheticElementKind.notSynthetic;
     if (element.isSynthetic) {
       if (element is ConstructorElement) {
         kind = IndexSyntheticElementKind.constructor;
         element = element.enclosingElement;
       } else if (element is FunctionElement && element.name == 'loadLibrary') {
         kind = IndexSyntheticElementKind.loadLibrary;
         element = element.library;
       } else if (element is PropertyAccessorElement) {
         PropertyAccessorElement accessor = element;
-        kind = accessor.isGetter
-            ? IndexSyntheticElementKind.getter
-            : IndexSyntheticElementKind.setter;
-        element = accessor.variable;
+        Element enclosing = element.enclosingElement;
+        bool isEnumGetter = enclosing is ClassElement && enclosing.isEnum;
+        if (isEnumGetter && accessor.name == 'index') {
+          kind = IndexSyntheticElementKind.enumIndex;
+          element = enclosing;
+        } else if (isEnumGetter && accessor.name == 'values') {
+          kind = IndexSyntheticElementKind.enumValues;
+          element = enclosing;
+        } else {
+          kind = accessor.isGetter
+              ? IndexSyntheticElementKind.getter
+              : IndexSyntheticElementKind.setter;
+          element = accessor.variable;
+        }
       } else if (element is TopLevelVariableElement) {
         TopLevelVariableElement property = element;
         kind = IndexSyntheticElementKind.topLevelVariable;
         element = property.getter;
         element ??= property.setter;
       } else {
         throw new ArgumentError(
             'Unsupported synthetic element ${element.runtimeType}');
       }
     }
@@ skipping 551 matching lines @@
         usedNames: nameRelations.map((r) => r.nameInfo.id).toList(),
         usedNameKinds: nameRelations.map((r) => r.kind).toList(),
         usedNameOffsets: nameRelations.map((r) => r.offset).toList());
   }
 
   void defineName(String name, IndexNameKind kind, int offset) {
     _StringInfo nameInfo = pkg._getStringInfo(name);
     definedNames.add(new _DefinedNameInfo(nameInfo, kind, offset));
   }
 }