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: masp.rs
    path of file: ./repos/namada/crates/core/src
    
    the code of the file until where you have to start completion: //! MASP types

use std::fmt::Display;
use std::str::FromStr;

use borsh::{BorshDeserialize, BorshSerialize};
use borsh_ext::BorshSerializeExt;
use masp_primitives::asset_type::AssetType;
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};

use crate::address::{Address, DecodeError, HASH_HEX_LEN, MASP};
use crate::impl_display_and_from_str_via_format;
use crate::storage::Ep
    
    pub fn encode(&self) -> Result<AssetType, std::io::Error> {
        // Timestamp the chosen token with the current epoch
        let token_bytes = self.serialize_to_vec();
        // Generate the unique asset identifier from the unique token address
        AssetType::new(token_bytes.as_ref()).map_err(|_| {
            std::io::Error::new(
                std::io::ErrorKind::Other,
                "unable to create asset type".to_string(),
            )
        })
    }