Make hashCode a getter and not a method.

runtime/lib/mirrors_impl.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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 // These values are allowed to be passed directly over the wire.
 bool _isSimpleValue(var value) {
   return (value == null || value is num || value is String || value is bool);
 }
@@ skipping 76 matching lines @@
                                                 parameters);
       _functionTypes[sigString] = mirror;
     }
     return mirror;
   }
 
   String toString() => "MirrorSystem for isolate '${isolate.debugName}'";
 }
 
 abstract class _LocalMirrorImpl implements Mirror {
-  int hashCode() {
-    throw new NotImplementedException('Mirror.hashCode() is not implemented');
+  int get hashCode {
+    throw new NotImplementedException('Mirror.hashCode is not implemented');
   }
 
   // Local mirrors always return the same MirrorSystem.  This field
   // is more interesting once we implement remote mirrors.
   MirrorSystem get mirrors => _Mirrors.currentMirrorSystem();
 }
 
 class _LocalIsolateMirrorImpl extends _LocalMirrorImpl
     implements IsolateMirror {
   _LocalIsolateMirrorImpl(this.debugName, this._rootLibrary) {}
@@ skipping 855 matching lines @@
 
   // Creates a new local InstanceMirror
   static InstanceMirror makeLocalInstanceMirror(Object reflectee)
       native 'Mirrors_makeLocalInstanceMirror';
 
   // Creates a new local mirror for some Object.
   static InstanceMirror reflect(Object reflectee) {
     return makeLocalInstanceMirror(reflectee);
   }
 }