Handle explicit constructor.

tests/compiler/dart2js/serialization/model_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 dart2js.serialization_model_test;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
@@ skipping 24 matching lines @@
 
 main(List<String> args) {
   asyncTest(() async {
     Arguments arguments = new Arguments.from(args);
     String serializedData = await serializeDartCore(arguments: arguments);
     if (arguments.filename != null) {
       Uri entryPoint = Uri.base.resolve(nativeToUriPath(arguments.filename));
       await checkModels(serializedData, entryPoint);
     } else {
       Uri entryPoint = Uri.parse('memory:main.dart');
-      for (Test test in TESTS) {
+      arguments.forEachTest(TESTS, (int index, Test test) async {
         print('==============================================================');
         print(test.sourceFiles);
         await checkModels(
           serializedData,
           entryPoint,
           sourceFiles: test.sourceFiles,
           verbose: arguments.verbose);
-      }
+      });
     }
   });
 }
 
 Future checkModels(
   String serializedData,
   Uri entryPoint,
   {Map<String, String> sourceFiles: const <String, String>{},
    bool verbose: false}) async {
 
@@ skipping 337 matching lines @@
   return true;
 }
 
 String nodeToString(Node node) {
   String text = '$node';
   if (text.length > 40) {
     return '(${node.runtimeType}) ${text.substring(0, 37)}...';
   }
   return '(${node.runtimeType}) $text';
 }