EntityGenerator uses non-existing constant T_AMPERSAND

As per http://www.php.net/manual/en/tokens.php - the T_AMPERSAND token does not exist. I'm not sure what was the intent, but the entity generator fails on the following code:

            $elems = array_map(function($el) {
                return $el;
            }, $elems);

Due to the way notices are handled in Symfony, this basically stops the execution of the generator entirely. Not so great.

  [ErrorException]                                                                                            
  Notice: Use of undefined constant T_AMPERSAND - assumed 'T_AMPERSAND' in ./vendor/doctrine/lib/Doctrine/ORM/Tools/EntityGenerator.php line 454

Commenting out the offending line makes it work fine though, so I think it's just choking while expecting a function that takes args by reference or something.