an example && to replace

gistfile1.txt

    // fsync fd after executing blk
    fn fd_res_sync(&&fd: FdRes, opt_level: option<Level>,
                   blk: fn(&&Res<fd_t>)) {
        blk(Res({
            val: fd.fd, opt_level: opt_level,
            fsync_fn: fn@(&&fd: fd_t, l: Level) -> int {
                return os::fsync_fd(fd, l) as int;
            }
        }));
    }