astrieanna1.rs

fn outer1(i: &mut int) {
    if *i < 9 {
        *i += 1;
        outer2(i);
    }
}

fn outer2(i: &mut int) {
    *i += 1;
    outer1(i);
}

fn main() {
    let mut foo = 0;
    outer1(&mut foo);
    io::println(fmt!("%d", foo));  // prints "10"
}

astrieanna2.rs

fn main() {
    fn outer1(i: &mut int) {
        if *i < 9 {
            *i += 1;
            outer2(i);
        }
    }

    fn outer2(i: &mut int) {
        *i += 1;
        outer1(i);
    }

    let mut foo = 0;
    outer1(&mut foo);
    io::println(fmt!("%d", foo));  // prints "10"
}

astrieanna3.rs

fn main() {
    let bar = 1;

    fn outer1(i: &mut int) {
        if *i < 9 {
            *i += bar;  // error: attempted dynamic environment-capture
            outer2(i);
        }
    }

    fn outer2(i: &mut int) {
        *i += bar;  // error: attempted dynamic environment-capture
        outer1(i);
    }

    let mut foo = 0;
    outer1(&mut foo);
    io::println(fmt!("%d", foo));
}

astrieanna4.rs

fn main() {
    let bar = 1;

    let outer1 = |i| {
        if *i < 9 {
            *i += bar;
            outer2(i);  // error: unresolved name: outer2
        }
    };

    let outer2 = |i| {
        *i += bar;
        outer1(i);
    };

    let mut foo = 0;
    io::println(fmt!("%d", foo));
    outer1(&mut foo);
}