Make hasNext a getter instead of a method.

lib/compiler/implementation/lib/coreimpl_patch.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.
 
 // Patch file for dart:coreimpl classes.
 
 // Patch for String implementation.
 // TODO(ager): Split out into date_patch.dart and allow #source
 // in patch files?
 patch class StringImplementation {
@@ skipping 218 matching lines @@
 class _AllMatchesIterator implements Iterator<Match> {
   final RegExp _re;
   final String _str;
   Match _next;
   bool _done;
 
   _AllMatchesIterator(JSSyntaxRegExp re, String this._str)
     : _done = false, _re = JSSyntaxRegExp._globalVersionOf(re);
 
   Match next() {
-    if (!hasNext()) {
+    if (!hasNext) {
       throw const NoMoreElementsException();
     }
 
     // _next is set by [hasNext].
     var next = _next;
     _next = null;
     return next;
   }
 
-  bool hasNext() {
+  bool get hasNext {
     if (_done) {
       return false;
     } else if (_next != null) {
       return true;
     }
 
     // firstMatch actually acts as nextMatch because of
     // hidden global flag.
     _next = _re.firstMatch(_str);
     if (_next == null) {
       _done = true;
       return false;
     } else {
       return true;
     }
   }
 }