Update comments in core lib showing proper factory syntax.

corelib/src/map.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.
 
 /**
  * A [Map] is an associative container, mapping a key to a value.
  * Null values are supported.
  */
-interface Map<K, V> factory HashMapImplementation/* <K, V> */ {
-// Bug 5408808: Factory should be HashMapImplementation<K, V>.
+interface Map<K, V> factory HashMapImplementation/*<K extends Hashable, V>*/ {
+// See issue 417. Works in the vm, fails in dartc and frog.
 
   /**
    * Creates a map with the default implementation.
    */
   Map();
 
   /**
    * Creates a [Map] that contains all key value pairs of [other].
    */
   Map.from(Map<K, V> other);
@@ skipping 67 matching lines @@
    */
   bool isEmpty();
 }
 
 /**
  * Hash map version of the [Map] interface. A [HashMap] does not
  * provide any guarantees on the order of keys and values in [getKeys]
  * and [getValues].
  */
 interface HashMap<K extends Hashable, V> extends Map<K, V>
-    factory HashMapImplementation/* <K, V> */ {
-// Bug 5408808: Factory should be HashMapImplementation<K, V>.
+    factory HashMapImplementation/*<K extends Hashable, V>*/ {
+// See issue 417. Works in the vm, fails in dartc and frog.
 
   /**
    * Creates a map with the default implementation.
    */
   HashMap();
 
   /**
    * Creates a [HashMap] that contains all key value pairs of [other].
    */
   HashMap.from(Map<K, V> other);
 }
 
 /**
  * Hash map version of the [Map] interface that preserves insertion
  * order.
  */
 interface LinkedHashMap<K extends Hashable, V> extends HashMap<K, V>
-    factory LinkedHashMapImplementation /* <K, V> */ {
-// Bug 5408808: Factory should be LinkedHashMapImplementation<K, V>.
+    factory LinkedHashMapImplementation/*<K extends Hashable, V>*/ {
+// See issue 417. Works in the vm, fails in dartc and frog.
 
   /**
    * Creates a map with the default implementation.
    */
   LinkedHashMap();
 
   /**
    * Creates a [LinkedHashMap] that contains all key value pairs of [other].
    */
   LinkedHashMap.from(Map<K, V> other);
 }