struct ValueMenu {
    name string
}

fn (mut v ValueMenu) resp(resp []u8) {
    println('menu ${v.name} ${resp}')
}

fn value_resp[T](mut t T, r []u8) {
    $if T is $array {
        value_array_resp(mut t, r)
    }
}

fn value_array_resp[T](mut t T, r []u8) {
    $if T is []ValueMenu {
        for _, mut i in t { // mut i -> C error
            i.resp(r)
        }
        for i := 0; i < t.len; i++ { // WORKAROUND
            t[i].resp(r)
        }
    }
}

struct Colors {
mut:
    normal []ValueMenu = [ValueMenu{'blink'}, ValueMenu{'hue'}]
}

fn (c &Colors) resp(resp []u8) {
    $for f in c.fields {
        mut m := c.$(f.name)
        value_resp(mut m, resp)
    }
}

fn test_main() {
    colors := &Colors{}
    colors.resp([u8(0), 1, 2])
    assert true
}