Resolved: Is there an alternative expression for match in Rust?

let engine_name = match config.engine_name {
    Some(name) => name,
    None => host_name.clone(),
};

->
let engine_name = config.engine_name
    .unwrap_or_else(|| host_name.clone());


let group_name = match config.group_name {
    Some(name) => name,
    None => String::from("")
};
->
let group_name = config.group_name.unwrap_or_default();

let accept_service = ServiceBuilder::new().service(match AcceptService::new() {
    Ok(service) => service,
    Err(e) => return Err(format!("failed to bind server socket: {}", e).into()),
});

ServiceBuilder::new()
    .service(AcceptService::new().map_err(|e| format!("failed to bind server socket: {}", e)?));