Merge branch 'master' of https://github.com/unitycontainer/container

src/Storage/RegistrationSet.cs

@@ -51,6 +51,7 @@ namespace Unity.Storage
             if (++_index >= Count) return false;
 
             // Set current box to next item in collection.
+            if (null == _current)
             _current = new ContainerRegistration(_entries[_index].Type, _entries[_index].Registration);
 
             return true;