Use iterator, moveNext(), current.

pkg/unittest/lib/src/core_matchers.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.
 
 part of matcher;
 
 /**
  * Returns a matcher that matches empty strings, maps or collections.
  */
 const Matcher isEmpty = const _Empty();
@@ skipping 80 matching lines @@
   final _expected;
   final int _limit;
   var count;
 
   _DeepMatcher(this._expected, [limit = 1000]) : this._limit = limit;
 
   String _compareIterables(expected, actual, matcher, depth) {
     if (actual is !Iterable) {
       return 'is not Iterable';
     }
-    var expectedIterator = expected.iterator();
-    var actualIterator = actual.iterator();
+    var expectedIterator = expected.iterator;
+    var actualIterator = actual.iterator;
     var position = 0;
     String reason = null;
     while (reason == null) {
-      if (expectedIterator.hasNext) {
-        if (actualIterator.hasNext) {
-          Description r = matcher(expectedIterator.next(),
-                           actualIterator.next(),
+      if (expectedIterator.moveNext()) {
+        if (actualIterator.moveNext()) {
+          Description r = matcher(expectedIterator.current,
+                           actualIterator.current,
                            'mismatch at position ${position}',
                            depth);
           if (r != null) reason = r.toString();
           ++position;
         } else {
           reason = 'shorter than expected';
         }
-      } else if (actualIterator.hasNext) {
+      } else if (actualIterator.moveNext()) {
         reason = 'longer than expected';
       } else {
         return null;
       }
     }
     return reason;
   }
 
   Description _recursiveMatch(expected, actual, String location, int depth) {
     Description reason = null;
@@ skipping 561 matching lines @@
       description.add(_featureDescription).add(' ').addDescriptionOf(_matcher);
 
   Description describeMismatch(item, Description mismatchDescription,
                                MatchState matchState, bool verbose) {
     mismatchDescription.add(_featureName).add(' ');
     _matcher.describeMismatch(matchState.state['feature'], mismatchDescription,
         matchState.state['innerState'], verbose);
     return mismatchDescription;
   }
 }