Import rasta tests.

pkg/fasta/test/rasta/issue_000004.dart

+// 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.md file.
+
+import 'package:expect/expect.dart';
+
+fact4() {
+  var f = 1;
+  for (var n in [1, 2, 3, 4]) {
+    f *= n;
+  }
+  return f;
+}
+
+fact5() {
+  var f = 1, n;
+  for (n in [1, 2, 3, 4, 5]) {
+    f *= n;
+  }
+  return f;
+}
+
+var global;
+fact6() {
+  var f = 1;
+  for (global in [1, 2, 3, 4, 5, 6]) {
+    f *= global;
+  }
+  return f;
+}
+
+main() {
+  Expect.isTrue(fact4() == 24);
+  Expect.isTrue(fact5() == 120);
+  Expect.isTrue(fact6() == 720);
+}