Fix warnings_checker.dart handling of multitests

tests/standalone/io/socket_ipv6_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 'dart:io';
 import 'dart:async';
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 import "test_utils.dart" show retry;
@@ skipping 112 matching lines @@
         throw "Unexpected connect";
       }, onError: (e) {}).whenComplete(() {
         server.close();
         asyncEnd();
       });
     });
   });
 }
 
 main() async {
-  await testIPv6toIPv6(); //               /// 01: ok
-  await testIPv4toIPv6(); //               /// 02: ok
-  await testIPv4toIPv4(); //               /// 03: ok
-  await testIPv6Lookup(); //               /// 04: ok
-  await testIPv4Lookup(); //               /// 05: ok
+  await testIPv6toIPv6(); //               //# 01: ok
+  await testIPv4toIPv6(); //               //# 02: ok
+  await testIPv4toIPv4(); //               //# 03: ok
+  await testIPv6Lookup(); //               //# 04: ok
+  await testIPv4Lookup(); //               //# 05: ok
 
-  await retry(testIPv6toIPv4); //          /// 06: ok
-  await retry(testIPv4toIPv6_IPV6Only); // /// 07: ok
+  await retry(testIPv6toIPv4); //          //# 06: ok
+  await retry(testIPv4toIPv6_IPV6Only); // //# 07: ok
 }