Fix warnings_checker.dart handling of multitests

tests/lib/mirrors/abstract_class_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.
 
 library test.abstract_class_test;
 
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 void main() {
@@ skipping 112 matching lines @@
   Expect.isFalse(reflectClass(ConcreteMA2).isAbstract);
   Expect.isFalse(reflectClass(ConcreteMA2).superclass.isAbstract);
   Expect.isFalse(reflectClass(ConcreteMA2).superclass.superclass.isAbstract);
   }
 }
 
 abstract class NamedMA = S with M;
 class SubNamedMA extends NamedMA {
   mixinFoo() {}
 }
-class ConcreteNamedMA = S with M; /// 00: static type warning
+class ConcreteNamedMA = S with M; //# 00: static type warning
 
 abstract class NamedMA2 = S with M2;
 class SubNamedMA2 extends NamedMA2 {
   mixinFoo() {}
 }
 class ConcreteNamedMA2 = S with M2;
 
 testNamedMixinApplication() {
   // Application is abstract.
   {
   // Mixin is abstract.
   Expect.isFalse(reflectClass(SubNamedMA).isAbstract);
   Expect.isTrue(reflectClass(SubNamedMA).superclass.isAbstract);
   Expect.isFalse(reflectClass(SubNamedMA).superclass.superclass.isAbstract);
   Expect.isTrue(reflectClass(NamedMA).isAbstract);
   Expect.isFalse(reflectClass(NamedMA).superclass.isAbstract);
 
   // Mixin is concrete.
   Expect.isFalse(reflectClass(SubNamedMA2).isAbstract);
   Expect.isTrue(reflectClass(SubNamedMA2).superclass.isAbstract);
   Expect.isFalse(reflectClass(SubNamedMA2).superclass.superclass.isAbstract);
   Expect.isTrue(reflectClass(NamedMA2).isAbstract);
   Expect.isFalse(reflectClass(NamedMA2).superclass.isAbstract);
   }
 
   // Application is concrete.
   {
   // Mixin is abstract.
-  Expect.isFalse(reflectClass(ConcreteNamedMA).isAbstract); /// 00: ok
-  Expect.isFalse(reflectClass(ConcreteNamedMA).superclass.isAbstract); /// 00: ok
+  Expect.isFalse(reflectClass(ConcreteNamedMA).isAbstract); //# 00: ok
+  Expect.isFalse(reflectClass(ConcreteNamedMA).superclass.isAbstract); //# 00: ok
 
   // Mixin is concrete.
   Expect.isFalse(reflectClass(ConcreteNamedMA2).isAbstract);
   Expect.isFalse(reflectClass(ConcreteNamedMA2).superclass.isAbstract);
   }
 }