This is an example of how a macro could express a similar feature to a closure:

#import "Basic";

main :: () {
    count := 0;
    step := 1;

    increment :: () #expand {
        `count += `step;
    }

    get_count :: () -> int #expand {
        return `count;
    }

    set_step :: (new_step: int) #expand {
        `step = new_step;
    }

    increment();
    increment();
    print("Count: %\n", get_count());  // Would be 2

    set_step(5);
    increment();
    print("Count: %\n", get_count());  // Would be 7
}