Merge pull request #527 from BenMorel/master

Fix documentation for Doctrine\ORM\Query\AST\Node::dispatch()

lib/Doctrine/ORM/Query/AST/Node.php

@@ -37,6 +37,10 @@ abstract class Node
      * Implementation is not mandatory for all nodes.
      *
      * @param $walker
+     *
+     * @return string
+     *
+     * @throws ASTException
      */
     public function dispatch($walker)
     {