Handle explicit constructor.

tests/compiler/dart2js/serialization/compilation_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.
 
 library dart2js.serialization_compilation_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common/backend_api.dart';
 import 'package:compiler/src/common/names.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/serialization/system.dart';
 import '../memory_compiler.dart';
 import 'helper.dart';
 import 'test_data.dart';
 import '../output_collector.dart';
 
 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 compile(serializedData, entryPoint, null);
     } else {
       Uri entryPoint = Uri.parse('memory:main.dart');
-      int start = arguments.index ?? 0;
-      int end = arguments.index ?? TESTS.length - 1;
-      for (int index = start; index <= end; index++) {
-        Test test = TESTS[index];
+      arguments.forEachTest(TESTS, (int index, Test test) async {
         await compile(serializedData, entryPoint, test,
                       index: index,
                       verbose: arguments.verbose);
-      }
+      });
     }
   });
 }
 
 Future compile(String serializedData, Uri entryPoint, Test test,
                {int index, bool verbose: false}) async {
   String testDescription =
       test != null ? test.sourceFiles[entryPoint.path] : '${entryPoint}';
   print('------------------------------------------------------------------');
   print('compile ${index != null ? '$index:' :''}${testDescription}');
   print('------------------------------------------------------------------');
   OutputCollector outputCollector = new OutputCollector();
   await runCompiler(
       entryPoint: entryPoint,
       memorySourceFiles: test != null ? test.sourceFiles : const {},
       options: [],
       outputProvider: outputCollector,
       beforeRun: (Compiler compiler) {
         compiler.serialization.deserializeFromText(serializedData);
       });
   if (verbose) {
     print(outputCollector.getOutput('', 'js'));
   }
 }