Handle redirects to unresolved redirects

tests/language/factory6_test.dart

Index: tests/language/factory6_test.dart
diff --git a/tests/language/super_no_such_method1_test.dart b/tests/language/factory6_test.dart
similarity index 52%
copy from tests/language/super_no_such_method1_test.dart
copy to tests/language/factory6_test.dart
index 3ee615112eb2020c8a09f64f2b1de34bd6bad185..0f998ff253d1342027c97eaacb05d97025588f4c 100644
--- a/tests/language/super_no_such_method1_test.dart
+++ b/tests/language/factory6_test.dart
@@ -4,16 +4,14 @@
 
 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
+}