Add Fasta tests.

pkg/fasta/test/cycles.dart

Index: pkg/fasta/test/cycles.dart
diff --git a/pkg/fasta/test/cycles.dart b/pkg/fasta/test/cycles.dart
new file mode 100644
index 0000000000000000000000000000000000000000..977faff54bcc32f39bb6abd828671a1c9120ed87
--- /dev/null
+++ b/pkg/fasta/test/cycles.dart
@@ -0,0 +1,22 @@
+// 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.
+
+class A implements C {
+}
+
+class B extends A {
+}
+
+class C extends B implements D {
+}
+
+class D {
+}
+
+main() {
+  print(new A());
+  print(new B());
+  print(new C());
+  print(new D());
+}