Fix unittests

tests/compiler/dart2js/inference/inference_test_helper.dart

 // Copyright (c) 2017, 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:compiler/src/common.dart';
 import 'package:compiler/src/common_elements.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/resolution/tree_elements.dart';
 import 'package:compiler/src/tree/nodes.dart';
 import 'package:compiler/src/types/types.dart';
 import 'package:expect/expect.dart';
 
 import '../annotated_code_helper.dart';
 import '../memory_compiler.dart';
 import 'enumerator.dart';
 
 typedef void CheckMemberFunction(
     Compiler compiler, Map<Id, String> expectedMap, MemberElement member);
 
 /// Compiles the [annotatedCode] with the provided [options] and calls
 /// [checkMember] for each member in the code providing the map from [Id] to
 /// annotation. Any [Id] left in the map will be reported as missing.
 checkCode(String annotatedCode, CheckMemberFunction checkMember,
     {List<String> options: const <String>[]}) async {
-  AnnotatedCode code = new AnnotatedCode.fromText(annotatedCode, '/*', '*/');
+  AnnotatedCode code =
+      new AnnotatedCode.fromText(annotatedCode, commentStart, commentEnd);
   Map<Id, String> expectedMap = computeExpectedMap(code);
   Compiler compiler = compilerFor(
       memorySourceFiles: {'main.dart': code.sourceCode}, options: options);
   compiler.stopAfterTypeInference = true;
   Uri mainUri = Uri.parse('memory:main.dart');
   await compiler.run(mainUri);
   LibraryElement mainApp = compiler.mainApp;
   mainApp.forEachLocalMember((dynamic member) {
     if (member.isClass) {
       member.forEachLocalMember((member) {
@@ skipping 135 matching lines @@
   visitSend(Send node) {
     checkSend(node);
     visitNode(node);
   }
 
   visitSendSet(SendSet node) {
     checkSend(node);
     visitNode(node);
   }
 }