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

test/codegen/language/async_await_catch_regression_test.dart

Index: test/codegen/language/async_await_catch_regression_test.dart
diff --git a/test/codegen/language/async_await_catch_regression_test.dart b/test/codegen/language/async_await_catch_regression_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b0df58efdb50daf6866f62e32e138f6cf2805bac
--- /dev/null
+++ b/test/codegen/language/async_await_catch_regression_test.dart
@@ -0,0 +1,26 @@
+// 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.
+
+import "package:expect/expect.dart";
+import "package:async_helper/async_helper.dart";
+
+foo() async {
+  throw 42;
+}
+
+test() async {
+  var exception;
+  try {
+    await foo();
+  } catch (e) {
+    print(await(e));
+    await (exception = await e);
+  }
+  Expect.equals(42, exception);
+}
+
+main() {
+  asyncStart();
+  test().then((_) => asyncEnd());
+}