Make hasNext a getter instead of a method.

utils/template/utils.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.
 
 // Collection<T> supports most of the ES 5 Array methods, but it's missing
 // map and reduce.
 
 // TODO(jmesserly): we might want a version of this that return an iterable,
 // however JS, Python and Ruby versions are all eager.
 List map(Iterable source, mapper(source)) {
   List result = new List();
   if (source is List) {
     List list = source; // TODO: shouldn't need this
     result.length = list.length;
     for (int i = 0; i < list.length; i++) {
       result[i] = mapper(list[i]);
     }
   } else {
     for (final item in source) {
       result.add(mapper(item));
     }
   }
   return result;
 }
 
 reduce(Iterable source, callback, [initialValue]) {
   final i = source.iterator();
 
   var current = initialValue;
-  if (current == null && i.hasNext()) {
+  if (current == null && i.hasNext) {
     current = i.next();
   }
-  while (i.hasNext()) {
+  while (i.hasNext) {
     current = callback(current, i.next());
   }
   return current;
 }
 
 List zip(Iterable left, Iterable right, mapper(left, right)) {
   List result = new List();
   var x = left.iterator();
   var y = right.iterator();
-  while (x.hasNext() && y.hasNext()) {
+  while (x.hasNext && y.hasNext) {
     result.add(mapper(x.next(), y.next()));
   }
-  if (x.hasNext() || y.hasNext()) {
+  if (x.hasNext || y.hasNext) {
     throw new ArgumentError();
   }
   return result;
 }