str my_value = "meow :3";
const fn update(str* v, str new_value): {
*v = new_value;
}
update(&my_value, "mrrr. I'm eepy -w-"); // `my_value` is
// "mrrr. I'm eepy -w-" after this point
// Imagine an output to the stdout. I don't have built-in functions yet :<