Fix warnings_checker.dart handling of multitests

tests/language_strong/malbounded_type_test_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';
 
 class Super<T extends num> {}
-class Malbounded1 implements Super<String> {} // /// 01: static type warning, dynamic type error
-class Malbounded1 implements Super<String> {} // /// 02: static type warning
-class Malbounded2 extends Super<String> {} // /// 03: static type warning, dynamic type error
+class Malbounded1 implements Super<String> {} // //# 01: static type warning, dynamic type error
+class Malbounded1 implements Super<String> {} // //# 02: static type warning
+class Malbounded2 extends Super<String> {} // //# 03: static type warning, dynamic type error
 
 main() {
-  var m = new Malbounded1(); // /// 01: continued
-  Expect.isFalse(m is Super<int>); // /// 01: continued
+  var m = new Malbounded1(); // //# 01: continued
+  Expect.isFalse(m is Super<int>); // //# 01: continued
   var s = new Super<int>();
-  Expect.isFalse(s is Malbounded1); // /// 02: continued
-  Expect.isFalse(s is Malbounded2); // /// 03: continued
-  Expect.isFalse(s is Super<String>); // /// 04: static type warning, dynamic type error
+  Expect.isFalse(s is Malbounded1); // //# 02: continued
+  Expect.isFalse(s is Malbounded2); // //# 03: continued
+  Expect.isFalse(s is Super<String>); // //# 04: static type warning, dynamic type error
 }