Fix warnings_checker.dart handling of multitests

tests/language/factory_implementation_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 "package:expect/expect.dart";
 
 abstract class A {
   factory A(int x, int y) = B;
 }
 
@@ skipping 18 matching lines @@
 
   factory B.X(int a, int b) { return new XImpl(a * 10, b * 10); }
 }
 
 main() {
   var a = new A(1, 2);
   // Check that constructor B is invoked and not factory B.A.
   Expect.equals(1, a.x);
   Expect.equals(2, a.y);
 
-  var x = new X(11, 22); // /// 00: dynamic type error
+  var x = new X(11, 22); // //# 00: dynamic type error
   // Check that factory is invoked.
-  Expect.equals(110, x.x); // /// 00: continued
-  Expect.equals(220, x.y); // /// 00: continued
+  Expect.equals(110, x.x); // //# 00: continued
+  Expect.equals(220, x.y); // //# 00: continued
 }