Fix warnings_checker.dart handling of multitests

tests/language/fauxverride_test.dart

 // Copyright (c) 2011, 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.
 
 import "package:expect/expect.dart";
 
 // Test the semantics of static members mixed with instance members.
 
 // Following are relevant quotes from Dart Programming Language
 // Specification, Draft Version 0.10, June 7, 2012.
@@ skipping 50 matching lines @@
 class Sub extends Super {
   // According to 7.6, static methods are not inherited.
   static m() => 'sub';
 
   // According to 7.7, static variables are not inherited.
   static var i = 'sub';
 
   // According to 7.1, instance methods include those of the
   // superclass, and according to 7, it is a compile-time to have an
   // instance method and static method with the same name.
-  static /// 03: compile-time error
+  static //# 03: compile-time error
   instanceMethod() => m();
 
   // According to 7.7, static variables are not inherited.
   static i2() => m();
 
   // According to 7.1, instance methods include those of the
   // superclass, and according to 7, it is a compile-time to have an
   // instance method and static method with the same
   // name. Furthermore, according to 7.7 a static variable induces an
   // implicit getter function (a static method).
-  static var instanceMethod2; /// 05: compile-time error
+  static var instanceMethod2; //# 05: compile-time error
 
   foo() => 'foo';
 }
 
 main() {
   Expect.equals('foo', new Sub().foo());
   Expect.equals('top level', m());
   Expect.equals('super', Super.m());
   Expect.equals('sub', Sub.m());
   Expect.equals('super', Super.i);
   Expect.equals('sub', Sub.i);
   Expect.equals('super', Super.i2);
   Expect.equals('sub', Sub.i2());
   Expect.equals('super', new Super().instanceMethod());
   Expect.equals('sub', new Sub().instanceMethod());
   Expect.equals('super', new Super().instanceMethod2());
   Expect.equals('super', new Sub().instanceMethod2());
 }