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/namada/crates/namada/src/ledger/native_vp/ibc
    
    the code of the file until where you have to start completion: //! IBC integration as a native validity predicate

pub mod context;

use std::cell::RefCell;
use std::collections::{BTreeSet, HashSet};
use std::rc::Rc;
use std::time::Duration;

use context::{PseudoExecutionContext, VpValidationContext};
use namada_core::address::Address;
use namada_core::storage::Key;
use namad
    
    fn commitment(packet: &Packet) -> PacketCommitment {
        let timeout = packet.timeout_timestamp_on_b.nanoseconds().to_be_bytes();
        let revision_number = packet
            .timeout_height_on_b
            .commitment_revision_number()
            .to_be_bytes();
        let revision_height = packet
            .timeout_height_on_b
            .commitment_revision_height()
            .to_be_bytes();
        let data = sha2::Sha256::digest(&packet.data);
        let input = [
            &timeout,
            &revision_number,
            &revision_height,
            data.as_slice(),
        ]
        .concat();
        sha2::Sha256::digest(&input).to_vec().into()
    }