PHP warning in entriesform (68)

PHP 7 emits warning: Parameter 1 to ... expected to be a reference, value given in C:\wamp\www\moodle\mod\dataform\classes\pluginbase\entriesform.php on line 68, on $mform.

// If the element is an array, it contains a function.

list($func, $params) = $element;

call_user_func_array($func, array_merge(array($mform), $params));