my_var := 1
my_simple_closure := fn [my_var] () {
    println(my_var)
}
my_closure_returns := fn [my_var] () int {
    return my_var
}
my_closure_has_params := fn [my_var, my_closure_returns] (add int) {
    println(my_var + my_closure_returns() + add)
}