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: migrate_agent.rs
    path of file: ./repos/holochain/crates/holochain/src/core/ribosome/guest_callback
    
    the code of the file until where you have to start completion: use crate::core::ribosome::FnComponents;
use crate::core::ribosome::HostContext;
use crate::core::ribosome::Invocation;
use crate::core::ri
    
    fn migrate_agent_invocation_host_input() {
        let migrate_agent_invocation = MigrateAgentInvocationFixturator::new(::fixt::Empty)
            .next()
            .unwrap();

        let host_input = migrate_agent_invocation.clone().host_input().unwrap();

        assert_eq!(
            host_input,
            ExternIO::encode(MigrateAgentFixturator::new(::fixt::Empty).next().unwrap()).unwrap(),
        );
    }