Handle redirects to unresolved redirects

tests/language/factory6_test.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 file.
 
 import 'package:expect/expect.dart';
 
-class A {
-  noSuchMethod(im) => 42;
+abstract class Link<T> {
+  factory Link.Foo() = LinkFactory<T>.Foo;  /// 00: static type warning
 }
 
-class B extends A {
-  noSuchMethod(im) => 87;
-
-  foo() => super.foo(); /// 01: static type warning
+class LinkFactory<T> {
+  factory LinkFactory.Foo() = Foo<T>;  /// 00: continued
 }
 
 main() {
-  Expect.equals(42, new B().foo()); /// 01: continued
-}
+  Expect.throws(() => new Link<int>.Foo()); /// 00: continued
+}