Fix warnings_checker.dart handling of multitests

tests/language_strong/named_constructor_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.
 
 library named_constructor_test;
 
 import 'package:expect/expect.dart';
 import 'named_constructor_lib.dart' as prefix;
 
 class Class<T> {
   final int value;
   Class() : value = 0;
   Class.named() : value = 1;
 }
 
 void main() {
   Expect.equals(0, new Class().value);
   Expect.equals(0, new Class<int>().value);
 
   Expect.equals(1, new Class.named().value);
   Expect.equals(1, new Class<int>.named().value);
   // 'Class.named' is not a type:
-  Expect.equals(1, new Class.named<int>().value); /// 01: runtime error
+  Expect.equals(1, new Class.named<int>().value); //# 01: runtime error
   // 'Class<int>.named<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(1, new Class<int>.named<int>().value); /// 02: compile-time error
+  Expect.equals(1, new Class<int>.named<int>().value); //# 02: compile-time error
 
   Expect.equals(2, new prefix.Class().value);
   // 'prefix' is not a type:
-  Expect.equals(2, new prefix<int>.Class().value); /// 03: runtime error
+  Expect.equals(2, new prefix<int>.Class().value); //# 03: runtime error
   Expect.equals(2, new prefix.Class<int>().value);
   // 'prefix<int>.Class<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(2, new prefix<int>.Class<int>().value); /// 04: compile-time error
+  Expect.equals(2, new prefix<int>.Class<int>().value); //# 04: compile-time error
 
   Expect.equals(3, new prefix.Class.named().value);
   // 'prefix<int>.Class.named' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix<int>.Class.named().value); /// 05: compile-time error
+  Expect.equals(3, new prefix<int>.Class.named().value); //# 05: compile-time error
   // 'prefix.Class<int>.named' doesn't fit the grammar syntax T.id:
   Expect.equals(3, new prefix.Class<int>.named().value);
   // 'prefix.Class.named<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix.Class.named<int>().value); /// 06: compile-time error
+  Expect.equals(3, new prefix.Class.named<int>().value); //# 06: compile-time error
   // 'prefix<int>.Class<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix<int>.Class<int>.named().value); /// 07: compile-time error
+  Expect.equals(3, new prefix<int>.Class<int>.named().value); //# 07: compile-time error
   // 'prefix<int>.Class.named<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix<int>.Class.named<int>().value); /// 08: compile-time error
+  Expect.equals(3, new prefix<int>.Class.named<int>().value); //# 08: compile-time error
   // 'prefix.Class<int>.named<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix.Class<int>.named<int>().value); /// 09: compile-time error
+  Expect.equals(3, new prefix.Class<int>.named<int>().value); //# 09: compile-time error
   // 'prefix<int>.Class<int>.named<int>' doesn't fit the grammar syntax T.id:
-  Expect.equals(3, new prefix<int>.Class<int>.named<int>().value); /// 10: compile-time error
+  Expect.equals(3, new prefix<int>.Class<int>.named<int>().value); //# 10: compile-time error
 }