mason2 update a url

mamesaye <[email protected]>
Newsgroups gmane.comp.web.mason.user
Message-ID <[email protected]>
my $uria = URI->new($r->unparsed_uri); 
$uria->query_param(page2 => $pager->previous_page); 
'<% $uria % '> Previous  

how would this translate in mason 2? 
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