Rust pretty printer

gistfile1.txt

fn main() {
    io::println(str::concat([~"hello, ",
                             extfmt::rt::conv_str({flags:
                                                       extfmt::rt::flag_none,
                                                   width:
                                                       extfmt::rt::count_implied,
                                                   precision:
                                                       extfmt::rt::count_implied,
                                                   ty:
                                                       extfmt::rt::ty_default,},
                                                  ~"world")]/_));
}