await in frog: partial support for try-catch blocks

frog/tests/await/src/TryCatch3Test.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 awaited future produces the error.
+
+#import("await_test_helper.dart");
+
+errorDuring() {
+  try {
+    final ef = errorOf("my error");
+    final t = await ef;
+    return t;
+  } catch (e) {
+    Expect.equals("my error", e);
+    return 2;
+  }
+}
+
+main() {
+  int t = await errorDuring();
+  Expect.equals(2, t);
+}