Token of an empty comment reference should end with EOF.

pkg/analyzer/test/src/task/incremental_element_builder_test.dart

 // Copyright (c) 2015, 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.src.task.incremental_element_builder_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ skipping 1605 matching lines @@
     _buildNewUnit(r'''
 f1() {
   print(12);
 }
 f2() {
   B b = new B((C c) {});
 }
 ''');
   }
 
+  test_update_emptyCommentReference() {
+    _buildOldUnit(r'''
+/// Empty [] reference.
+class A {}
+''');
+    _buildNewUnit(r'''
+/// Empty [] reference.
+class A {}
+''');
+  }
+
   test_update_rewrittenConstructorName() {
     _buildOldUnit(r'''
 class A {
   A();
   A.named();
 }
 
 foo() {}
 
 main() {
@@ skipping 196 matching lines @@
     ClassDeclaration oldClass = _findClassNode(oldUnit, name);
     expect(oldClass, isNotNull);
     element = oldClass.element;
     oldMembers = oldClass.members.toList();
   }
 
   ClassDeclaration _findClassNode(CompilationUnit unit, String name) =>
       unit.declarations.singleWhere((unitMember) =>
           unitMember is ClassDeclaration && unitMember.name.name == name);
 }