fixes #28032, await in cascade

pkg/dev_compiler/test/codegen/language/await_in_cascade_test.dart

Index: pkg/dev_compiler/test/codegen/language/await_in_cascade_test.dart
diff --git a/pkg/dev_compiler/test/codegen/language/await_in_cascade_test.dart b/pkg/dev_compiler/test/codegen/language/await_in_cascade_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e9fbcf9bda79decf92d7461c7cedfa2781c6e976
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/language/await_in_cascade_test.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2016, 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.
+
+import 'dart:async';
+import 'package:expect/expect.dart';
+
+class C {
+  Future<List<int>> m() async => []..add(await _m());
+  Future<int> _m() async => 42;
+}
+
+main() async {
+  Expect.equals(await new C().m(), 42);
+}