[wp-hackers] update $wp_query->post->guid fails

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Hi list members,

i imported test/example posts some time ago. Today i checked the
following:

[code]
global $wp_query;
$test_me = $wp_query->post->guid;
echo $test_me;
[/code]

The result was http://dev.*****.com/dan/wordpress/?p=53

I than took a look into $wpdb->table_prefix . '_posts' and found that
it was really stored there as the result told me. I tried saving the
post again, but the guid-column field stays the same.

Am i running into a bug? Thanks!