comments_link does not accept $file argument

Sorry, hit the return key before entering the text … so, here it is:
I’m trying to link to a different page than the standard index.php when clicking on comments. The problem is, that the comments_link function doesn’t seem to accept die $file argument. No matter what file location I pass, the location still remains the same. Is this a bug? When I look at the function, there seems to be no use for the $file argument…

function comments_link($file='', $echo=true) {
global $id, $pagenow;
if ($file == '') $file = $pagenow;
if ($file == '/') $file = '';
if (!$echo) return get_permalink() . '#comments';
else echo get_permalink() . '#comments';
}

Can anyone help me on this?