Fix warnings_checker.dart handling of multitests

tests/language/factory2_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 "dart:collection";
 
 abstract class Link<T> extends IterableBase<T> {
   // does not match constructor for LinkFactory
-  factory Link(T head, [Link<T> tail]) = LinkFactory<T>; /// static type warning
+  factory Link(T head, [Link<T> tail]) = LinkFactory<T>; //# static type warning
   Link<T> prepend(T element);
 }
 
 abstract class EmptyLink<T> extends Link<T> {
   const factory EmptyLink() = LinkTail<T>;
 }
 
 class LinkFactory<T> {
   factory LinkFactory(head, [Link tail]) { }
 }
@@ skipping 12 matching lines @@
   const LinkTail();
 }
 
 // Does not implement all of Iterable
 class LinkEntry<T> extends AbstractLink<T> {
   LinkEntry(T head, Link<T> realTail);
 }
 
 class Fisk {
   // instantiation of abstract class
-  Link<String> nodes = const EmptyLink(); // /// static type warning
+  Link<String> nodes = const EmptyLink(); // //# static type warning
 }
 
 main() {
   new Fisk();
   // instantiation of abstract class
-  new EmptyLink<String>().prepend('hest'); /// static type warning
+  new EmptyLink<String>().prepend('hest'); //# static type warning
   // instantiation of abstract class
-  const EmptyLink<String>().prepend('fisk'); /// static type warning
+  const EmptyLink<String>().prepend('fisk'); //# static type warning
 }