Make isEmpty a getter.

pkg/intl/lib/date_format.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.
 
 /**
  * DateFormat is for formatting and parsing dates in a locale-sensitive
  * manner.
  * It allows the user to choose from a set of standard date time formats as well
  * as specify a customized pattern under certain locales. Date elements that
  * vary across locales include month name, week name, field order, etc.
@@ skipping 515 matching lines @@
       (pattern, parent) => new _DateFormatLiteralField(pattern, parent)];
 
   /** Parse the template pattern and return a list of field objects.*/
   List parsePattern(String pattern) {
     if (pattern == null) return null;
     return _reverse(_parsePatternHelper(pattern));
   }
 
   /** Recursive helper for parsing the template pattern. */
   List _parsePatternHelper(String pattern) {
-    if (pattern.isEmpty()) return [];
+    if (pattern.isEmpty) return [];
 
     var matched = _match(pattern);
     if (matched == null) return [];
 
     var parsed = _parsePatternHelper(
                       pattern.substring(matched.fullPattern().length));
     parsed.add(matched);
     return parsed;
   }
 
@@ skipping 12 matching lines @@
   List _reverse(List list) {
     // TODO(alanknight): Use standardized list reverse when implemented.
     // See Issue 2804.
     var result = new List();
     for (var i = list.length-1; i >= 0; i--) {
       result.addLast(list[i]);
     }
     return result;
   }
 }