Fix warnings_checker.dart handling of multitests

tests/language_strong/issue18628_1_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.
 
 // This test checks for a regression found in Dart Editor: the
 // analyzer was treating [Type] as more specific than any type
 // variable (generic parameter).
 //
 // https://code.google.com/p/dart/issues/detail?id=18628
 
 class C<T> {
   // This line is supposed to cause the warning; the other commented
   // line just doesn't make sense without this line.
-  T t = int; /// 01: static type warning
+  T t = int; //# 01: static type warning
 }
 
 main() {
   C<Type> c = new C<Type>();
-  print(c.t); /// 01: static type warning
+  print(c.t); //# 01: static type warning
 }