Make isEmpty a getter.

lib/compiler/implementation/tools/mini_parser.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.
 
 #library('parser');
 
 #import('dart:io');
 #import('dart:scalarlist');
 
 #import('../../../utf/utf.dart');
@@ skipping 96 matching lines @@
       throw;
     } else {
       print(ex);
     }
   } catch (ex) {
     print('Error in file: $filename');
     throw;
   }
   if (options.buildAst) {
     MyNodeListener l = listener;
-    if (!l.nodes.isEmpty()) {
+    if (!l.nodes.isEmpty) {
       String message = 'Stack not empty after parsing';
       print(formatError(message, l.nodes.head.getBeginToken(),
                         l.nodes.head.getEndToken(), file));
       throw message;
     }
   }
 }
 
 Token scan(MySourceFile source) {
   Scanner scanner = new ByteArrayScanner(source.rawText);
@@ skipping 184 matching lines @@
   set text(String newText) {
     throw "not supported";
   }
 }
 
 class Mock {
   const Mock();
   bool get useColors => true;
   internalError(message) { throw message.toString(); }
 }