Make hashCode a getter and not a method.

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 393 matching lines @@
   String get simpleName => _element.name.slowToString();
 
   String get displayName => simpleName;
 
   Location get location => new Dart2JsLocation(
       _element.getCompilationUnit().script,
       system.compiler.spanFromElement(_element));
 
   String toString() => _element.toString();
 
-  int hashCode() => qualifiedName.hashCode();
+  int get hashCode => qualifiedName.hashCode;
 }
 
 abstract class Dart2JsProxyMirror implements Dart2JsMirror {
   final Dart2JsMirrorSystem system;
 
   Dart2JsProxyMirror(this.system);
 
   String get displayName => simpleName;
 
-  int hashCode() => qualifiedName.hashCode();
+  int get hashCode => qualifiedName.hashCode;
 }
 
 //------------------------------------------------------------------------------
 // Mirror system implementation.
 //------------------------------------------------------------------------------
 
 class Dart2JsMirrorSystem implements MirrorSystem, Dart2JsMirror {
   final api.Compiler compiler;
   Map<String, Dart2JsLibraryMirror> _libraries;
   Map<LibraryElement, Dart2JsLibraryMirror> _libraryMap;
@@ skipping 21 matching lines @@
     return _libraryMap[element];
   }
 
   Dart2JsMirrorSystem get system => this;
 
   String get simpleName => "mirror";
   String get displayName => simpleName;
   String get qualifiedName => simpleName;
 
   // TODO(johnniwinther): Hack! Dart2JsMirrorSystem need not be a Mirror.
-  int hashCode() => qualifiedName.hashCode();
+  int get hashCode => qualifiedName.hashCode;
 }
 
 abstract class Dart2JsObjectMirror extends Dart2JsElementMirror
     implements ObjectMirror {
   Dart2JsObjectMirror(Dart2JsMirrorSystem system, Element element)
       : super(system, element);
 }
 
 class Dart2JsLibraryMirror extends Dart2JsObjectMirror
     implements LibraryMirror {
@@ skipping 912 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);
     }
   }
 }