initial sync*, part of #221

test/codegen/syncstar_syntax.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.
+
+Iterable<int> foo() sync* {
+  yield 1;
+  yield* [2, 3];
+}
+
+class Class {
+  Iterable<int> bar() sync* {
+    yield 1;
+    yield* [2, 3];
+  }
+
+  static Iterable<int> baz() sync* {
+    yield 1;
+    yield* [2, 3];
+  }
+}
+
+main() {
+  Iterable<int> qux() sync* {
+    yield 1;
+    yield* [2, 3];
+  }
+
+  foo().forEach(print);
+  new Class().bar().forEach(print);
+  Class.baz().forEach(print);
+  qux().forEach(print);
+}