await in frog: partial support for try-catch blocks

frog/tests/await/src/TryCatch4Test.dart

+// Copyright (c) 2011, 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.
+
+// Await within a try-catch block, the error occurs after the await.
+
+#import("await_test_helper.dart");
+
+errorAfter() {
+  try {
+    final t = await futureOf(3);
+    throw "error";
+    return t;
+  } catch (e) {
+    return 3;
+  }
+}
+
+main() {
+  int t = await errorAfter();
+  Expect.equals(3, t);
+}