Delete some very old, leftover code.

lib/Doctrine/ORM/Persisters/UnionSubclassPersister.php

@@ -1,24 +0,0 @@
-<?php
-/*
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This software consists of voluntary contributions made by many individuals
- * and is licensed under the MIT license. For more information, see
- * <http://www.doctrine-project.org>.
- */
-
-namespace Doctrine\ORM\Persisters;
-
-class UnionSubclassPersister extends BasicEntityPersister
-{
-}

lib/Doctrine/ORM/UnitOfWork.php

@@ -2964,7 +2964,7 @@ class UnitOfWork implements PropertyChangedListener
                 break;
 
             default:
-                $persister = new Persisters\UnionSubclassPersister($this->em, $class);
+                throw new \RuntimeException('No persister found for entity.');
         }
 
         $this->persisters[$entityName] = $persister;