Fix directory listing to actually have the semantics intended.

tests/standalone/io/file_system_links_test.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.
 
 #import('dart:io');
 
 
 createLink(String dst, String link, bool symbolic, void callback()) {
   var args = [ symbolic ? '-s' : '', dst, link ];
   var script = 'tests/standalone/io/ln.sh';
@@ skipping 125 matching lines @@
       Expect.isTrue(files[0].endsWith(x));
       Expect.equals(1, dirs.length);
       Expect.isTrue(dirs[0].endsWith(y));
       temp.deleteRecursivelySync();
       temp2.deleteRecursivelySync();
     };
   });
 }
 
 
+testDirectoryListingBrokenLink() {
+  var temp = new Directory('').createTempSync();
+  var x = '${temp.path}${Platform.pathSeparator}x';
+  var link = '${temp.path}${Platform.pathSeparator}link';
+  var doesNotExist = 'this_thing_does_not_exist';
+  new File(x).createSync();
+  createLink(doesNotExist, link, true, () {
+    var files = [];
+    var dirs = [];
+    var errors = [];
+    var lister = temp.list(recursive: true);
+    lister.onFile = (f) => files.add(f);
+    lister.onDir = (d) => dirs.add(d);
+    lister.onError = (d) => errors.add(d);
+    lister.onDone = (success) {
+      Expect.isFalse(success);
+      Expect.equals(1, files.length);
+      Expect.isTrue(files[0].endsWith(x));
+      Expect.equals(0, dirs.length);
+      Expect.equals(1, errors.length);
+      Expect.isTrue(errors[0].toString().contains(link));
+      temp.deleteRecursivelySync();
+    };
+  });
+}
+
+
 main() {
   testFileExistsCreate();
   testFileDelete();
   testFileWriteRead();
   testDirectoryExistsCreate();
   testDirectoryDelete();
   testDirectoryListing();
+  testDirectoryListingBrokenLink();
 }