Fix warnings_checker.dart handling of multitests

tests/language/assign_top_method_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 "package:expect/expect.dart";
 
 method() { return 0; }
 
 main() {
   // Illegal, can't change a top level method
-  Expect.throws(() { method = () { return 1; }; }, // /// 01: static type warning
-                (e) => e is NoSuchMethodError); //    /// 01: continued
+  Expect.throws(() { method = () { return 1; }; }, // //# 01: static type warning
+                (e) => e is NoSuchMethodError); //    //# 01: continued
 }