returning a stack closure

gistfile1.rs

fn foo<'a>(blk: &fn(bar: &'a fn() -> &'a fn())) {
        let x = 5;
        let bar: &fn() = || { io::println(fmt!("%d", x)); };
        do blk || { bar };
}

fn main() {
        do foo |bar| { bar()(); }
}

fn foo<'a>(blk: fn(bar: fn:'a() -> fn:'a())) {
    let x = 5;
    let bar = || {...};
    blk(|| bar);
}

fn main() {
    do foo |bar| { bar()(); }
}