Code shared from the Rust Playground

playground.rs

struct MsgReader<'a> {
    tx: &'a RoTransaction,
    buf: &'a [u8];
    buf_reader: BufReader<&'a [u8]>,
    msg: capnp::message::Reader<'a, OwnedSegments>,
}

fn get<'a>(tx: &'a RoTransaction, id: u64) -> MsgReader<'a>
{
    let buf = tx.get(id);
    let buf_reader = BufReader::new(buf);
    let msg = capnp::serialize::read_message(&mut buf_reader).unwrap();
    MsgReader {
        tx: tx,
        buf: buf,
        buf_reader: buf_reader,
        msg: msg,
    }
}

fn main() {
    println!("Hello, world!");
}