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: uad_lists.rs
    path of file: ./repos/universal-android-debloater/src/core
    
    the code of the file until where you have to start completion: use crate::core::utils::{format_diff_time_from_now, last_modified_date};
use crate::CACHE_DIR;
use retry::{delay::Fixed, retry, OperationResult};
use serde::{Deserialize, Seri
    
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let date = last_modified_date(CACHE_DIR.join("uad_lists.json"));
        let s = match self {
            Self::Downloading => "Checking updates...".to_string(),
            Self::Done => format!("Done (last was {})", format_diff_time_from_now(date)),
            Self::Failed => "Failed to check update!".to_string(),
        };
        write!(f, "{s}")
    }