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: builtin_pgm.rs
    path of file: ./repos/hypercube/src
    
    the code of the file until where you have to start completion: //! system program

use bincode::deserialize;
use dynamic_program::DynamicProgram;
use xpz_program_interface::account::Account;
use xpz_program_interface::pubkey::Pubkey;
use std::collections::HashMap;
use std::sync::RwLock;
use transaction::Transaction;

#[derive(Serialize, Deserialize, Debug, Clone)]
pub enum SystemProgram
    
    fn test_create_allocate_already_allocated() {
        let from = Keypair::new();
        let to = Keypair::new();
        let mut accounts = vec![Account::default(), Account::default()];
        accounts[1].userdata = vec![0, 0, 0];
        let tx = Transaction::system_create(
            &from,
            to.pubkey(),
            Hash::default(),
            0,
            2,
            Pubkey::default(),
            0,
        );
        let hash = RwLock::new(HashMap::new());
        SystemProgram::process_transaction(&tx, &mut accounts, &hash);
        assert_eq!(accounts[1].userdata.len(), 3);
    }