await in frog: partial support for try-catch blocks

frog/tests/await/src/TryCatch2Test.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, error occurs before the await.
+
+#import("await_test_helper.dart");
+
+errorBefore() {
+  try {
+    throw "error";
+    final t = await futureOf(0);
+    return t;
+  } catch (e) {
+    return 1;
+  }
+}
+
+main() {
+  int t = await errorBefore();
+  Expect.equals(1, t);
+}