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: main.rs
    path of file: ./repos/bottlerocket/sources/api/migration/migrations/v1.16.0/kernel-modules-autoload-settings/src
    
    the code of the file until where you have to start completion: use migration_helpers::{migrate, Migration, MigrationData, Result};
use std::process;

const KMOD_AUTOLOAD_PREFIX: &str = "settings.kernel.modules";
const KMOD_AUTOLOAD_SETTING: &str = "autoload";

/// We added a new autoload setting to the kernel.mudules set of tables. These tables
/// co
    
    fn backward(&mut self, mut input: MigrationData) -> Result<MigrationData> {
        let settings = input
            .data
            .keys()
            .filter(|k| k.starts_with(KMOD_AUTOLOAD_PREFIX))
            .filter(|k| k.ends_with(KMOD_AUTOLOAD_SETTING))
            .cloned()
            .collect::<Vec<_>>();
        for setting in settings {
            if let Some(data) = input.data.remove(&setting) {
                println!("Removed {}, which was set to '{}'", setting, data);
            }
        }
        Ok(input)
    }