Make isEmpty a getter.

pkg/dartdoc/lib/src/mirrors/dart2js_mirror.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 mirrors_dart2js;
 
 import 'dart:io';
 import 'dart:uri';
 
 import '../../../../../lib/compiler/compiler.dart' as diagnostics;
@@ skipping 22 matching lines @@
 bool _isPrivate(String name) {
   return name.startsWith('_');
 }
 
 List<ParameterMirror> _parametersFromFunctionSignature(
     Dart2JsMirrorSystem system,
     Dart2JsMethodMirror method,
     FunctionSignature signature) {
   var parameters = <ParameterMirror>[];
   Link<Element> link = signature.requiredParameters;
-  while (!link.isEmpty()) {
+  while (!link.isEmpty) {
     parameters.add(new Dart2JsParameterMirror(
         system, method, link.head, false));
     link = link.tail;
   }
   link = signature.optionalParameters;
-  while (!link.isEmpty()) {
+  while (!link.isEmpty) {
     parameters.add(new Dart2JsParameterMirror(
         system, method, link.head, true));
     link = link.tail;
   }
   return parameters;
 }
 
 Dart2JsTypeMirror _convertTypeToTypeMirror(
     Dart2JsMirrorSystem system,
     DartType type,
@@ skipping 670 matching lines @@
   InterfaceMirror get superclass {
     if (_class.supertype != null) {
       return new Dart2JsInterfaceTypeMirror(system, _class.supertype);
     }
     return null;
   }
 
   List<InterfaceMirror> get interfaces {
     var list = <InterfaceMirror>[];
     Link<DartType> link = _class.interfaces;
-    while (!link.isEmpty()) {
+    while (!link.isEmpty) {
       var type = _convertTypeToTypeMirror(system, link.head,
                                           system.compiler.types.dynamicType);
       list.add(type);
       link = link.tail;
     }
     return list;
   }
 
   bool get isClass => !_class.isInterface();
 
@@ skipping 638 matching lines @@
     if (node !== null) {
       var span = system.compiler.spanFromNode(node, script.uri);
       return new Dart2JsLocation(script, span);
     } else {
       var span = system.compiler.spanFromElement(_variable);
       return new Dart2JsLocation(script, span);
     }
   }
 }