Make hashCode a getter and not a method.

pkg/logging/lib/logging.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.
 
 /**
  * Provides APIs for debugging and error logging. This library introduces
  * abstractions similar to those used in other languages, such as the Closure JS
  * Logger and java.util.logging.Logger.
  */
 #library('logging');
@@ skipping 278 matching lines @@
 
   /** Key for extra debugging loudness ([value] = 1200). */
   static const Level SHOUT = const Level('SHOUT', 1200);
 
   bool operator ==(Level other) => other != null && value == other.value;
   bool operator <(Level other) => value < other.value;
   bool operator <=(Level other) => value <= other.value;
   bool operator >(Level other) => value > other.value;
   bool operator >=(Level other) => value >= other.value;
   int compareTo(Level other) => value - other.value;
-  int hashCode() => value;
+  int get hashCode => value;
   String toString() => name;
 }
 
 
 /**
  * A log entry representation used to propagate information from [Logger] to
  * individual [Handler]s.
  */
 class LogRecord {
   final Level level;
@@ skipping 15 matching lines @@
 
   /** Associated exception message (if any) when recording errors messages. */
   String exceptionText;
 
   LogRecord(
       this.level, this.message, this.loggerName,
       [time, this.exception, this.exceptionText]) :
     this.time = (time == null) ? new Date.now() : time,
     this.sequenceNumber = LogRecord._nextNumber++;
 }