Rev 2455 of wp-includes/functions.php breaks the admin interface

[kim]

Since the WP_INSTALLING constant is not defined during normal operation, calling constant('WP_INSTALLING') causes an error about the constant not existing. This is printed many times over when entering the dashboard.

Looking at the code, I think calling defined('WP_INSTALLING') achieves what was intended.

Patch attached.

[kim]

I have error_reporting=E_ALL and display_errors=On, and the error messages are what breaks the admin interface.