Check cycles in redirecting factories.

tests/language/factory_redirection3_cyclic_test.dart

Index: tests/language/factory_redirection3_cyclic_test.dart
diff --git a/tests/language/factory_redirection3_cyclic_test.dart b/tests/language/factory_redirection3_cyclic_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1a87541e9d417c9490f6a4faf819329f650f41f7
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+++ b/tests/language/factory_redirection3_cyclic_test.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2013, 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.
+
+// Test that a cycle in redirecting factories leads to a compile-time error.
+
+class A {
+  factory A.foo() = B;
+}
+
+class B<T> implements A {
+  factory B() = C.bar;
+}
+
+class C<T> implements B {
+  factory C.bar() = C.foo;
+  factory C.foo() = C
+    .bar /// 01: compile-time error
+;
+  C();
+}
+
+main() {
+  new A<int>.foo();
+}