Fix warnings_checker.dart handling of multitests

tests/language/enum_private_test.dart

 // Copyright (c) 2015, 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.
 
 // Test privacy issue for enums.
 
 library enum_private_test;
 
 import 'package:expect/expect.dart';
 
 import 'enum_private_lib.dart';
 
 enum Enum1 {
   _A,
   _B,
 }
 
 main() {
   Expect.equals('Enum1._A,Enum1._B', Enum1.values.join(','));
-  Expect.equals('Enum2._A,Enum2._B', Enum2.values.join(',')); /// 01: ok
-  Expect.throws(() => Enum2._A, (e) => e is NoSuchMethodError); /// 02: static type warning
+  Expect.equals('Enum2._A,Enum2._B', Enum2.values.join(',')); //# 01: ok
+  Expect.throws(() => Enum2._A, (e) => e is NoSuchMethodError); //# 02: static type warning
 }