Use iterator, moveNext(), current.

tests/corelib/list_iterators_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 ListIteratorsTest {
   static void checkListIterator(List a) {
-    Iterator it = a.iterator();
-    Expect.equals(false, it.hasNext == a.isEmpty);
+    Iterator it = a.iterator;
     for (int i = 0; i < a.length; i++) {
-      Expect.equals(true, it.hasNext);
-      var elem = it.next();
+      Expect.isTrue(it.moveNext());
+      var elem = it.current;
+      Expect.equals(a[i], elem);
     }
-    Expect.equals(false, it.hasNext);
-    bool exceptionCaught = false;
-    try {
-     var eleme = it.next();
-    } on StateError catch (e) {
-     exceptionCaught = true;
-    }
-    Expect.equals(true, exceptionCaught);
+    Expect.isFalse(it.moveNext());
+    Expect.throws(() { it.current; }, (e) => e is StateError);
   }
 
   static testMain() {
     checkListIterator([]);
     checkListIterator([1, 2]);
     checkListIterator(new List(0));
     checkListIterator(new List(10));
     checkListIterator(new List());
     List g = new List();
-    g.addAll([1, 2]);
+    g.addAll([1, 2, 3]);
     checkListIterator(g);
 
-    Iterator it = g.iterator();
-    Expect.equals(true, it.hasNext);
+    Iterator it = g.iterator;
+    Expect.isTrue(it.moveNext());
     g.removeLast();
-    Expect.equals(true, it.hasNext);
+    Expect.equals(1, it.current);
+    Expect.isTrue(it.moveNext());
     g.removeLast();
-    Expect.equals(false, it.hasNext);
+    Expect.throws(() => it.current);
+    Expect.isFalse(it.moveNext());
 
+    g.clear();
     g.addAll([10, 20]);
     int sum = 0;
     for (var elem in g) {
       sum += elem;
       // Iterator must realize that g has no more elements.
       g.removeLast();
     }
     Expect.equals(10, sum);
   }
 }
 
 main() {
   ListIteratorsTest.testMain();
 }