Make first and last getters.

samples/ui_lib/observable/observable.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.
 
 #library('observable');
 
 #import('dart:coreimpl');
 
 #source('ChangeEvent.dart');
 #source('EventBatch.dart');
@@ skipping 168 matching lines @@
       add(element);
     }
   }
 
   int push(T element) {
     recordListInsert(length, element);
     _internal.add(element);
     return _internal.length;
   }
 
-  T last() => _internal.last();
+  T get last => _internal.last;
 
   T removeLast() {
     final result = _internal.removeLast();
     recordListRemove(length, result);
     return result;
   }
 
   T removeAt(int index) {
     int i = 0;
     T found = null;
@@ skipping 90 matching lines @@
     //              equality check should be done?
     if (newValue !== _value) {
       final oldValue = _value;
       _value = newValue;
       recordPropertyUpdate("value", newValue, oldValue);
     }
   }
 
   T _value;
 }