Fix warnings_checker.dart handling of multitests

tests/language/check_member_static_test.dart

 // Copyright (c) 2014, 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.
 
 class A {
   static var a;
   var b;
 }
 
 class B extends A {
 
 }
 
 class C extends B {
-  var a; /// 01: static type warning
-  static var b; /// 02: compile-time error
+  var a; //# 01: static type warning
+  static var b; //# 02: compile-time error
 }
 
 void main() {
   new C();
 }