Fix warnings_checker.dart handling of multitests

tests/language/malformed_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.
 
 // Tests that malformed types are handled as dynamic, and that types with the
 // wrong number of type arguments are handled as raw types.
 
 import 'package:expect/expect.dart';
 import 'package:expect/expect.dart' as prefix;  // Define 'prefix'.
 
@@ skipping 58 matching lines @@
 
   checkAsUnresolved('');
   checkAsUnresolved(0);
   checkAsListUnresolved(false, '');
   checkAsListUnresolved(true, new List());
   checkAsListUnresolved(true, new List<int>());
   checkAsListUnresolved(true, new List<String>());
   checkAsListUnresolved(true, new List<int, String>());
 
   checkIsListDynamic(true, []);
-  checkIsListDynamic(true, <>[]); /// 01: compile-time error
+  checkIsListDynamic(true, <>[]); //# 01: compile-time error
   checkIsListDynamic(false, <int>[]);
   checkIsListDynamic(true, <Unresolved>[]);
   checkIsListDynamic(true, <Unresolved<int>>[]);
   checkIsListDynamic(true, <prefix.Unresolved>[]);
   checkIsListDynamic(true, <prefix.Unresolved<int>>[]);
   checkIsListDynamic(true, <int, String>[]);
 
   checkIsListDynamic(true, new List());
-  checkIsListDynamic(true, new List<>()); /// 02: compile-time error
+  checkIsListDynamic(true, new List<>()); //# 02: compile-time error
   checkIsListDynamic(true, new List<Unresolved>());
   checkIsListDynamic(true, new List<Unresolved<int>>());
   checkIsListDynamic(true, new List<prefix.Unresolved>());
   checkIsListDynamic(true, new List<prefix.Unresolved<int>>());
   checkIsListDynamic(true, new List<int, String>());
 
   checkIsMapDynamic(true, true, <dynamic, dynamic>{});
   checkIsMapDynamic(true, true, {});
-  checkIsMapDynamic(true, true, <>{}); /// 03: compile-time error
+  checkIsMapDynamic(true, true, <>{}); //# 03: compile-time error
   checkIsMapDynamic(true, true, <int>{});
   checkIsMapDynamic(false, false, <String, int>{});
   checkIsMapDynamic(true, true, <String, int, String>{});
   checkIsMapDynamic(true, false, <Unresolved, int>{});
   checkIsMapDynamic(false, true, <String, Unresolved<int>>{});
   checkIsMapDynamic(true, false,  <prefix.Unresolved, int>{});
   checkIsMapDynamic(false, true, <String, prefix.Unresolved<int>>{});
 
   checkIsMapDynamic(true, true, new Map());
-  checkIsMapDynamic(true, true, new Map<>); /// 04: compile-time error
+  checkIsMapDynamic(true, true, new Map<>); //# 04: compile-time error
   checkIsMapDynamic(true, true, new Map<int>());
   checkIsMapDynamic(false, false, new Map<String, int>());
   checkIsMapDynamic(true, true, new Map<String, int, String>());
   checkIsMapDynamic(true, false, new Map<Unresolved, int>());
   checkIsMapDynamic(false, true, new Map<String, Unresolved<int>>());
   checkIsMapDynamic(true, false,  new Map<prefix.Unresolved, int>());
   checkIsMapDynamic(false, true, new Map<String, prefix.Unresolved<int>>());
 
   Expect.throws(() => new Unresolved(), (e) => true);
   Expect.throws(() => new Unresolved<int>(), (e) => true);
@@ skipping 38 matching lines @@
       throw 'foo';
     } on prefix.Unresolved<int> catch (e) {
       Expect.fail("This code shouldn't be executed");
     }
     Expect.fail("This code shouldn't be executed");
   } on TypeError catch (e) {
   }
   try {
     throw 'foo';
   }
-    on undeclared_prefix.Unresolved<int> // /// 06: runtime error
+    on undeclared_prefix.Unresolved<int> // //# 06: runtime error
     catch (e) {
   }
 }