lingering step 2 of the test rename overhaul: make await tests also a directory

frog/tests/await/nested_function_test.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.
 
+// The next line is used to tell test.dart that this test is run by invoking
+// awaitc.dart and passing this file as an argument (e.g. frog
+// frog/await/awaitc.dart test.dart):
+// VMOptions=frog/await/awaitc.dart
+
 // Await within a lambda function.
 
 #import("await_test_helper.dart");
 
 main() {
   bool called = false;
   final f2 = () {
     final f = futureOf(3);
     final x = await f;
     Expect.equals(3, x);
@@ skipping 17 matching lines @@
 //     });
 //     Futures.propagateError(f, _ret);
 //     return _ret1.future;
 //   })();
 //  Expect.equals(false, called);
 //  f2.then((v) {
 //    Expect.equals(true, called);
 //  });
 //  return _ret0.future;
 // }