Fix for indexing synthetic enum fields.

pkg/analyzer/test/src/summary/index_unit_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.
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
@@ skipping 717 matching lines @@
     {
       FieldElement field = findElement('bbb');
       PropertyAccessorElement getter = field.getter;
       PropertyAccessorElement setter = field.setter;
       assertThat(field)..isWrittenAt('bbb) {}', true);
       assertThat(getter)..isReferencedAt('bbb);', false);
       assertThat(setter)..isReferencedAt('bbb = 2;', false);
     }
   }
 
+  void test_isReferencedBy_FieldElement_ofEnum() {
+    verifyNoTestUnitErrors = false;
+    _indexTestUnit('''
+enum MyEnum {
+  A, B, C
+}
+main() {
+  print(MyEnum.values);
+  print(MyEnum.A.index);
+  print(MyEnum.A);
+  print(MyEnum.B);
+}
+''');
+    ClassElement enumElement = findElement('MyEnum');
+    assertThat(enumElement.getGetter('values'))
+      ..isReferencedAt('values);', true);
+    assertThat(enumElement.getGetter('index'))..isReferencedAt('index);', true);
+    assertThat(enumElement.getGetter('A'))..isReferencedAt('A);', true);
+    assertThat(enumElement.getGetter('B'))..isReferencedAt('B);', true);
+  }
+
   void test_isReferencedBy_FunctionElement() {
     _indexTestUnit('''
 foo() {}
 main() {
   print(foo);
   print(foo());
 }
 ''');
     FunctionElement element = findElement('foo');
     assertThat(element)
@@ skipping 422 matching lines @@
   final bool isQualified;
 
   _Relation(this.kind, this.offset, this.length, this.isQualified);
 
   @override
   String toString() {
     return '_Relation{kind: $kind, offset: $offset, length: $length, '
         'isQualified: $isQualified}';
   }
 }