Make first and last getters.

lib/coreimpl/queue.dart

 // Copyright (c) 2012, 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.
 
 
 /**
  * An entry in a doubly linked list. It contains a pointer to the next
  * entry, the previous entry, and the boxed element.
  */
 class DoubleLinkedQueueEntry<E> {
@@ skipping 118 matching lines @@
   }
 
   E removeLast() {
     return _sentinel._previous.remove();
   }
 
   E removeFirst() {
     return _sentinel._next.remove();
   }
 
-  E first() {
+  E get first {
     return _sentinel._next.element;
   }
 
-  E last() {
+  E get last {
     return _sentinel._previous.element;
   }
 
   DoubleLinkedQueueEntry<E> lastEntry() {
     return _sentinel.previousEntry();
   }
 
   DoubleLinkedQueueEntry<E> firstEntry() {
     return _sentinel.nextEntry();
   }
@@ skipping 100 matching lines @@
   }
 
   E next() {
     if (!hasNext) {
       throw const NoMoreElementsException();
     }
     _currentEntry = _currentEntry._next;
     return _currentEntry.element;
   }
 }