await in frog: partial support for try-catch blocks

frog/tests/await/src/TryCatch5Test.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, no error, but there is code after the
+// try-catch block.
+
+#import("await_test_helper.dart");
+
+noerror() {
+  var x = 0;
+  try {
+    x = await futureOf(2);
+  } catch (e) {
+    x = 3;
+  }
+  Expect.equals(2, x);
+  return x;
+}
+
+main() {
+  int t = await noerror();
+  Expect.equals(2, t);
+}