let fields = module{
    tpl = NULL,
} => {
    let reducer = macro(acc, field, value) => {
        result = acc + [field],
    };

    let result = reduce reducer.result [], (mod.tpl);
};

let values = module{
    tpl = NULL,
} => {
    let reducer = macro(acc, field, value) => {
        result = acc + [value],
    };

    let result = reduce reducer.result [], (mod.tpl);
};