Fix warnings_checker.dart handling of multitests

tests/lib/mirrors/reflect_class_test.dart

 // Copyright (c) 2013, 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:mirrors";
 
 import "package:expect/expect.dart";
 
 typedef void FooFunction(int a, double b);
 
 main() {
   Function expectedError = (e) => e is ArgumentError || e is TypeError;
 
   Expect.throws(() => reflectClass(dynamic), expectedError);
-  Expect.throws(() => reflectClass(1), expectedError); // /// 01: static type warning
-  Expect.throws(() => reflectClass("string"), expectedError); // /// 02: static type warning
+  Expect.throws(() => reflectClass(1), expectedError); // //# 01: static type warning
+  Expect.throws(() => reflectClass("string"), expectedError); // //# 02: static type warning
   Expect.throws(() => reflectClass(FooFunction), expectedError);
 }