Fix warnings_checker.dart handling of multitests

tests/language_strong/new_expression_type_args_test.dart

 // Copyright (c) 2012, 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 showing errors using type-arguments in new expressions:
 class A<T> {
   // Can't instantiate type parameter (within static or instance method).
-  m1() => new T(); //        /// 00: static type warning, runtime error
-  static m2() => new T(); // /// 01: static type warning, runtime error
+  m1() => new T(); //        //# 00: static type warning, runtime error
+  static m2() => new T(); // //# 01: static type warning, runtime error
 
   // OK when used within instance method, but not in static method.
   m3() => new A<T>();
-  static m4() => new A<T>(); /// 02: static type warning
+  static m4() => new A<T>(); //# 02: static type warning
 }
 
 main() {
   A a = new A();
-  a.m1(); /// 00: continued
-  A.m2(); /// 01: continued
+  a.m1(); //# 00: continued
+  A.m2(); //# 01: continued
   a.m3();
-  A.m4(); /// 02: continued
+  A.m4(); //# 02: continued
 }