Require legacy form of type parameters in factories and report errors if a factory class does not...

frog/leg/util/link_implementation.dart

 // Copyright (c) 2011, 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 LinkFactory {
+// TODO(regis): Move type parameter <T> from the class declaration to the
+// factory declarations after the new factory syntax is implemented.
+// See issues 226, 5257789, 5408808.
+class LinkFactory<T> {
   factory Link(head, [Link tail]) {
     return new LinkEntry(head, (tail === null) ? const LinkTail() : tail);
   }
 
   factory Link.fromList(List list) {
     switch (list.length) {
       case 0:
         return const LinkTail();
       case 1:
         return new Link(list[0]);
@@ skipping 99 matching lines @@
   void addLast(T t) {
     LinkEntry<T> entry = new LinkEntry<T>(t, null);
     if (head === null) {
       head = entry;
     } else {
       lastLink.realTail = entry;
     }
     lastLink = entry;
   }
 }