Fix warnings_checker.dart handling of multitests

tests/lib/mirrors/globalized_closures_test.dart

 // Copyright (c) 2014, 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.
 
 // Dart2js crashed on this example. It globalized closures and created
 // top-level classes for closures (here the globalized_closure). There was a
 // name-clash with the global "main_closure" class which led to a crash.
 
 library main;
 
@@ skipping 15 matching lines @@
   globalized_closure();
   final ms = currentMirrorSystem();
   var lib = ms.findLibrary(#main);
   var collectedParents = [];
   var classes = lib.declarations.values;
   for (var c in classes) {
     if (c is ClassMirror && c.superclass != null) {
       collectedParents.add(MirrorSystem.getName(c.superclass.simpleName));
     }
   };
-  Expect.listEquals(["Object"], collectedParents); //  /// 00: ok
+  Expect.listEquals(["Object"], collectedParents); //  //# 00: ok
 }