initial sync*, part of #221

test/codegen/syncstar_yieldstar_test.dart

+// Copyright (c) 2015, 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.
+
+// TODO(jmesserly): this is a copy of the language test of the same name,
+// we can remove this copy when we're running against those tests.
+import "expect.dart";
+
+bar() sync* {
+  int i = 1;
+  int j = 1;
+  while (true) {
+    yield i;
+    j = i + j;
+    i = j - i;
+  }
+}
+
+foo() sync* {
+  yield* [1, 2, 3];
+  yield null;
+  // TODO(jmesserly): added cast here to work around:
+  // https://codereview.chromium.org/1213503002/
+  yield* bar() as Iterable; 
+}
+
+main () async {
+  Expect.listEquals([1, 2, 3, null, 1, 1, 2, 3, 5], foo().take(9).toList());
+}