fixes #221, initial sync*, async, async* implementation

test/browser/language_tests.js

+// 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.
+
+var _isolate_helper = dart_library.import('dart/_isolate_helper');
+_isolate_helper.startRootIsolate(function() {}, []);
+
+function dartLanguageTests(tests) {
+  for (const name of tests) {
+    test(name, () => {
+      dart_library.import('language/' + name).main();
+    })
+  }
+}
+
+suite('sync*', () => {
+  "use strict";
+
+  test('syncstar_syntax', () => {
+    dart_library.import('syncstar_syntax').main();
+  });
+
+  dartLanguageTests([
+    'syncstar_yield_test',
+    'syncstar_yieldstart_test'
+  ]);
+});
+
+dart_library.import('language/async_await_test').main();
+
+suite('async', () => {
+  dartLanguageTests([
+    'async_and_or_test',
+    'async_await_catch_regression_test',
+    // TODO(jmesserly): fix errors
+    // 'async_backwards_compatibility_1_test',
+    'async_backwards_compatibility_2_test',
+    'async_break_in_finally_test',
+    // TODO(jmesserly): https://github.com/dart-lang/dev_compiler/issues/263
+    // 'async_continue_label_test',
+    'async_control_structures_test',
+    'async_finally_rethrow_test',
+    // TODO(jmesserly): fix errors
+    // 'async_or_generator_return_type_stacktrace_test',
+    'async_regression_23058_test',
+    'async_rethrow_test',
+    // TODO(jmesserly): fix errors
+    // 'async_return_types_test',
+    'async_switch_test',
+    'async_test',
+    'async_this_bound_test',
+    'async_throw_in_catch_test'
+  ]);
+})
+
+dart_library.import('language/async_star_test').main();
+
+suite('async*', () => {
+  dartLanguageTests([
+    // TODO(jmesserly): figure out why this test is hanging.
+    //'async_star_cancel_and_throw_in_finally_test',
+    'async_star_regression_23116_test',
+    'asyncstar_concat_test',
+    'asyncstar_throw_in_catch_test',
+    'asyncstar_yield_test',
+    'asyncstar_yieldstar_test'
+  ]);
+});