Use FailFast iterators.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278498 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/resources/BaseResourceCollectionWrapper.java

@@ -87,7 +87,7 @@ public abstract class BaseResourceCollectionWrapper
             return ((BaseResourceCollectionWrapper) getCheckedRef()).iterator();
         }
         dieOnCircularReference();
-        return cacheCollection().iterator();
+        return new FailFast(this, cacheCollection().iterator());
     }
 
     /**