Implement toString on File and Directory objects.

sdk/lib/io/directory.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.
 
 part of dart.io;
 
 /**
  * [Directory] objects are used for working with directories.
  */
 abstract class Directory {
@@ skipping 122 matching lines @@
   /**
    * List the sub-directories and files of this
    * [Directory]. Optionally recurse into sub-directories. Returns a
    * [DirectoryLister] object representing the active listing
    * operation. Handlers for files and directories should be
    * registered on this DirectoryLister object.
    */
   DirectoryLister list({bool recursive: false});
 
   /**
+   * Returns a human readable string for this Directory instance.
+   */
+  String toString();
+
+  /**
    * Gets the path of this directory.
    */
   final String path;
 }
 
 
 /**
  * A [DirectoryLister] represents an actively running listing operation.
  *
  * A [DirectoryLister] is obtained from a [Directory] object by calling
@@ skipping 56 matching lines @@
       if (path != null) {
         sb.add(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }