Debug WP_Rewrite

debug_rewrite.php

<?php
function debug_rewrite() {
	global $wp, $wp_rewrite;

	if ( !current_user_can( 'manage_options' ) )
		return;

	echo '<pre>';
	var_dump( $wp->matched_rule );
	print_r( $wp_rewrite );
	echo '</pre>';
}
add_action( 'template_redirect', 'debug_rewrite' );