Fix warnings_checker.dart handling of multitests

tests/language/factory6_test.dart

 // Copyright (c) 2016, 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';
 
 abstract class Link<T> {
-  factory Link.Foo() = LinkFactory<T>.Foo; // /// 00: static type warning
+  factory Link.Foo() = LinkFactory<T>.Foo; // //# 00: static type warning
 }
 
 class LinkFactory<T> {
-  factory LinkFactory.Foo() = Foo<T>; // /// 00: continued
+  factory LinkFactory.Foo() = Foo<T>; // //# 00: continued
 }
 
 main() {
-  Expect.throws(() => new Link<int>.Foo()); /// 00: continued
+  Expect.throws(() => new Link<int>.Foo()); //# 00: continued
 }