Name: [% user_name %]
Password: [% user_pass %]

##</code><code>##

my @items = find_used_template_parameters($template);
is_deeply \@items, [qw[ user_name user_pass ]];

##</code><code>##

Name: [% user_name %]
Password: [% user_pass %]
[% IF has_unused_fields('/^user_/') %]
[% list_unused_fields('/^user_/') %]
[% END %]

##</code><code>##

Name: Corion
Password: Secret
user_email: corion@corion.net