@function __create-compounder-function($string) {
    $callback: __this('callback');
    $index: 1;
    $list: __words($string);
    $length: length($list);
    $result: '';

    @while ($index <= $length) {
        $result: __exec($callback, $result, nth($list, $index), $index);
        $index: $index + 1;
    }

    @return $result;
}


@function __create-compounder($callback) {
    $_: __scope((
        'callback': $callback
    ));
    $scoped-function: __bind('__create-compounder-function');
    $_: __scope(false);

    @return $scoped-function;
}