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    use std::io;
    use ser::{Reader, Stream};
    use MessageResult;

    pub trait Payload: Send + 'static {
     	fn version() -> u32;
    	fn command() -> &'static str;
    	fn deserialize_payload<T>(reader: &mut Reader<T>, version: u32) -> MessageResult<Self> where Self: Sized, T: io::Read;
    	fn serialize_payload(&self, stream: &mut Stream, version: u32) -> MessageResult<()>;
    }

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