Fix warnings_checker.dart handling of multitests

tests/lib/mirrors/invoke_named_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.
 
 library test.invoke_named_test;
 
 import 'dart:mirrors';
 
 import 'dart:async' show Future;
 
@@ skipping 263 matching lines @@
                 'Insufficient positional arguments');
   Expect.throws(() => cm.apply(['X', 'Y', 'Z', 'W']),
                 isNoSuchMethodError,
                 'Extra positional arguments');
   Expect.throws(() => cm.apply(['X'], {const Symbol('undef'): 'Y'}),
                 isNoSuchMethodError,
                 'Unmatched named argument');
 }
 
 main() {
-  isDart2js = true; /// 01: ok
+  isDart2js = true; //# 01: ok
 
   testSyncInvoke(reflect(new C())); // InstanceMirror
 
   if (isDart2js) return;
 
   testSyncInvoke(reflectClass(D)); // ClassMirror
   LibraryMirror lib = reflectClass(D).owner;
   testSyncInvoke(lib); // LibraryMirror
 
   testSyncNewInstance();
 
   testSyncApply();
 }