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: mod.rs
    path of file: ./repos/solana/zk-token-sdk/src/instruction/transfer
    
    the code of the file until where you have to start completion: mod encryption;
mod with_fee;
mod without_fee;

#[cfg(not(target
    
    fn test_split_and_combine(amount: u64, bit_length: usize) {
        let (amount_lo, amount_hi) = try_split_u64(amount, bit_length).unwrap();
        assert_eq!(
            try_combine_lo_hi_u64(amount_lo, amount_hi, bit_length).unwrap(),
            amount
        );
    }