Make isEmpty a getter.

tests/corelib/list_test.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 ListTest {
 
   static testMain() {
     testList();
     testExpandableList();
   }
 
   static void expectValues(list, val1, val2, val3, val4) {
     Expect.equals(true, list.length == 4);
     Expect.equals(true, list.length == 4);
-    Expect.equals(true, !list.isEmpty());
+    Expect.equals(true, !list.isEmpty);
     Expect.equals(list[0], val1);
     Expect.equals(list[1], val2);
     Expect.equals(list[2], val3);
     Expect.equals(list[3], val4);
   }
 
   static void testClosures(List list) {
     testMap(val) {return val * 2 + 10; }
     Collection mapped = list.map(testMap);
     Expect.equals(mapped.length, list.length);
@@ skipping 65 matching lines @@
     try {
       list.clear();
     } on UnsupportedError catch (e) {
       exception = e;
     }
     Expect.equals(true, exception != null);
   }
 
   static void testExpandableList() {
     List list = new List();
-    Expect.equals(true, list.isEmpty());
+    Expect.equals(true, list.isEmpty);
     Expect.equals(list.length, 0);
     list.add(4);
     Expect.equals(1, list.length);
-    Expect.equals(true, !list.isEmpty());
+    Expect.equals(true, !list.isEmpty);
     Expect.equals(list.length, 1);
     Expect.equals(list.length, 1);
     Expect.equals(list.removeLast(), 4);
 
     for (int i = 0; i < 10; i++) {
       list.add(i);
     }
 
     Expect.equals(list.length, 10);
     for (int i = 0; i < 10; i++) {
@@ skipping 16 matching lines @@
     list[3] = 3;
     Expect.equals(-1, list.indexOf(100));
     Expect.equals(-1, list.lastIndexOf(100));
 
     testClosures(list);
 
     Expect.equals(list.removeLast(), 9);
     list.clear();
     Expect.equals(list.length, 0);
     Expect.equals(list.length, 0);
-    Expect.equals(true, list.isEmpty());
+    Expect.equals(true, list.isEmpty);
   }
 }
 
 class Yes {
   operator ==(var other) => true;
 }
 
 main() {
   ListTest.testMain();
 }