Fix warnings_checker.dart handling of multitests

tests/corelib/string_trimlr_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 "package:expect/expect.dart";
 
 // Characters with Whitespace property (Unicode 6.3).
 // 0009..000D    ; White_Space # Cc       <control-0009>..<control-000D>
 // 0020          ; White_Space # Zs       SPACE
 // 0085          ; White_Space # Cc       <control-0085>
@@ skipping 82 matching lines @@
 
     var s = new String.fromCharCode(i);
     Expect.identical(s, s.trimLeft());
     Expect.identical(s, s.trimRight());
   }
 
   // U+200b is currently being treated as whitespace by some JS engines.
   // string_trimlr_test/01 fails on these engines.
   // Should be fixed in tip-of-tree V8 per 2014-02-10.
   var s200B = new String.fromCharCode(0x200B);
-  Expect.identical(s200B, s200B.trimLeft()); //    /// 01: ok
-  Expect.identical(s200B, s200B.trimRight()); //   /// 01: ok
+  Expect.identical(s200B, s200B.trimLeft()); //    //# 01: ok
+  Expect.identical(s200B, s200B.trimRight()); //   //# 01: ok
 
   // U+180E ceased to be whitespace in Unicode version 6.3.0
   // string_trimlr_test/02 fails on implementations using earlier versions.
   var s180E = new String.fromCharCode(0x180E);
-  Expect.identical(s180E, s180E.trimLeft()); //    /// 02: ok
-  Expect.identical(s180E, s180E.trimRight()); //   /// 02: ok
+  Expect.identical(s180E, s180E.trimLeft()); //    //# 02: ok
+  Expect.identical(s180E, s180E.trimRight()); //   //# 02: ok
 }