dbp

macro_rules! num_visitor(
    ($typ:ident) => (
        fn visit_$typ() -> bool {
            self.align_to::<$typ>();
            do self.get::<$typ>() |i| {
                self.out += $typ::to_str(i, 10u);
            };
            self.bump_past::<$typ>();
            true
        }

dbp

fn main() {
    let bytes : ~[u8] = ~[1,1,1]; // for example
    let len = vec::len(bytes)-1;
    let mut out: u32 = 0;
    do vec::iteri(bytes) |i, b| {
        out += (b as u32) << (8*(len-i))
    }
    io::println(u32::str(out));
}

dbp

// how pretty printer formats closures (I think; I'm unable to build from incoming right now to check)
fn main() {
    do something |foo|
                     {
                         something_long_enough_to_not;
                         fit_on_a_single_line;
                     }
    let my_fn = || 
                 {
                     something_long_enough_to_not;