New general-template.php in 2.7

Hi, everyone.

I got a few sidebar templates since WP 2.2 . They all worked fine through WP 2.6 ( I tweaked general-template.php)

Yet I got stuck with the newest general-template.php in 2.7.

To be short, how do I need to tweak the code to get “special” (as they put it) specified?

The piece of general-template.php 2.7 code follows:

/**
 * Load sidebar template.
 *
 * Includes the sidebar template for a theme or if a name is specified then a
 * specialised sidebar will be included. If the theme contains no sidebar.php
 * file then the sidebar from the default theme will be included.
 *
 * For the parameter, if the file is called "sidebar-special.php" then specify
 * "special".
 *
 * @uses locate_template()
 * @since 1.5.0
 * @uses do_action() Calls 'get_sidebar' action.
 *
 * @param string $name The name of the specialised sidebar.
 */
function get_sidebar( $name = null ) {
	do_action( 'get_sidebar' );

	$templates = array();
	if ( isset($name) )
		$templates[] = "sidebar-{$name}.php";

	$templates[] = "sidebar.php";

	if ('' == locate_template($templates, true))
		load_template( get_theme_root() . '/default/sidebar.php');
}

All my attempts return “Call to undefined function …” so far..