You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: entry.rs
    path of file: ./repos/holochain/crates/holochain_integrity_types/src
    
    the code of the file until where you have to start completion: //! An Entry is a unit of data in a Holochain Source Chain.
//!
//! This module contains all the necessary definitions for Entry, which broadly speaking
//! refers to any data which will be written int
    
    fn hashable_content(&self) -> HashableContentBytes {
        match self {
            Entry::Agent(agent_pubkey) => {
                // We must retype this AgentPubKey as an EntryHash so that the
                // prefix bytes match the Entry prefix
                HashableContentBytes::Prehashed39(
                    EntryHash::from(agent_pubkey.clone()).into_inner(),
                )
            }
            entry => HashableContentBytes::Content(
                entry
                    .try_into()
                    .expect("Could not serialize HashableContent"),
            ),
        }
    }