Stop using the Hashable interface.

lib/mirrors/mirrors.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.
 
 // The dart:mirrors library provides reflective access for Dart program.
 //
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
@@ skipping 64 matching lines @@
  */
 InstanceMirror reflect(Object reflectee) {
   return _Mirrors.reflect(reflectee);
 }
 
 /**
  * A [Mirror] reflects some Dart language entity.
  *
  * Every [Mirror] originates from some [MirrorSystem].
  */
-abstract class Mirror implements Hashable {
+abstract class Mirror {
   /**
    * The [MirrorSystem] that contains this mirror.
    */
   MirrorSystem get mirrors;
 }
 
 /**
  * An [IsolateMirror] reflects an isolate.
  */
 abstract class IsolateMirror implements Mirror {
@@ skipping 640 matching lines @@
 
 /**
  * A [MirrorException] is used to indicate errors within the mirrors
  * framework.
  */
 class MirrorException implements Exception {
   const MirrorException(String this._message);
   String toString() => "MirrorException: '$_message'";
   final String _message;
 }