Fix warnings_checker.dart handling of multitests

tests/language/checked_setter3_test.dart

 // Copyright (c) 2013, 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";
 
 bool get inCheckedMode {
   try {
     var i = 42;
     String a = i;
   } catch (e) {
     return true;
   }
   return false;
 }
 
 class A<T> {
   T field;
 }
 
 class B<T> {
-  T field = 42; /// 01: static type warning
+  T field = 42; //# 01: static type warning
 }
 
 class C<T> {
-  T field = 42; /// 02: static type warning
+  T field = 42; //# 02: static type warning
 }
 
 main() {
   var a = new A<String>();
   var c = new C<int>();
   var i = 42;
   var s = 'foo';
   if (inCheckedMode) {
     Expect.throws(() => a.field = i, (e) => e is TypeError);
-    Expect.throws(() => new B<String>(), (e) => e is TypeError); /// 01: continued
-    Expect.throws(() => c.field = s, (e) => e is TypeError); /// 02: continued
+    Expect.throws(() => new B<String>(), (e) => e is TypeError); //# 01: continued
+    Expect.throws(() => c.field = s, (e) => e is TypeError); //# 02: continued
   } else {
     a.field = i;
-    new B<String>(); /// 01: continued
-    c.field = s; /// 02: continued
+    new B<String>(); //# 01: continued
+    c.field = s; //# 02: continued
   }
 }