Steps to reproduce the issue

Turn error reporting to maximum.

Expected result

Normal admin area.

Actual result

Page full of notices:
`Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 22

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 23

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/menu.php on line 94

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 28

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/menu.php on line 94

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 34

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 39

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 40

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/menu.php on line 94

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 46

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 56

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 60

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 64

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 70

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 74

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 78

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 82

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/menu.php on line 94

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 88

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 92

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 98

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 107

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/menu.php on line 94

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 116

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 127

Notice: Only variables should be passed by reference in /var/www/html/administrator/modules/mod_menu/tmpl/default_enabled.php on line 130`

System information (as much as possible)

PHP Version 7.0.22-0ubuntu0.16.04.1

Joomla 3.6.5

Additional comments

This was supposedly fixed in Joomla 3.6rc1, see issue #10977