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$some_var = 'Hello world!';
$my_templ->process( "$TEMPLATE_DIR/hello_world.html",
                    { 'filler' => \&some_sub( $some_var ) } );

$some_var = &some_sub( 'Hello world!' );
$my_templ->process( "$TEMPLATE_DIR/hello_world.html",
                    { 'filler' => $some_var } );