Fix set test, number of arguments to helper function changed.

tests/corelib/set_test.dart

 // Copyright (c) 2011, 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.
 
 library set_test;
 
 
 import 'package:expect/expect.dart';
 import "dart:collection";
 
@@ skipping 225 matching lines @@
   Expect.isFalse(set.remove("not an it"));
   Expect.isFalse(set.containsAll(["Not an int", "Also no an int"]));
 
   testLength(4, set);
   set.removeAll(["Not an int", 999, "Also no an int"]);
   testLength(3, set);
   set.retainAll(["Not an int", 0, "Also no an int"]);
   testLength(1, set);
 }
 
-void testRetainWhere(Set create([equals, hashCode, validKey])) {
+void testRetainWhere(Set create([equals, hashCode, validKey, compare])) {
   // The retainWhere method must not collapse the argument Iterable
   // in a way that doesn't match the equality of the set.
   // It must not throw away equal elements that are different in the
   // equality of the set.
   // It must not consider objects to be not there if they are equal
   // in the equality of the set.
 
   // If set equality is natural equality, using different but equal objects
   // must work. Can't use an identity set internally (as was done at some point
   // during development).
@@ skipping 138 matching lines @@
 
   testDifferenceIntersection(([equals, hashCode, validKey, comparator]) =>
       new HashSet(equals: equals, hashCode: hashCode, isValidKey: validKey));
   testDifferenceIntersection(([equals, hashCode, validKey, comparator]) =>
       new LinkedHashSet(equals: equals, hashCode: hashCode,
                         isValidKey: validKey));
   testDifferenceIntersection(([equals, hashCode, validKey, comparator]) =>
       new SplayTreeSet(comparator, validKey));
 
 }