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/vim-clap/crates/maple_core/src/tools/ctags
    
    the code of the file until where you have to start completion: mod buffer_tag;
mod context_tag;
mod project_tag;

use crate::process::ShellCommand;
use dirs::Dirs;
use itertools::Itertools;
use once_cell::sync::Lazy;
use paths::AbsPathBuf;
use rayon::prelude::*;
use std::collections::HashMap;
use s
    
    fn formatted_tags_iter(&self) -> Result<impl Iterator<Item = String>> {
        Ok(self.lines()?.filter_map(|tag| {
            if let Ok(tag) = serde_json::from_str::<ProjectTag>(&tag) {
                Some(tag.format_proj_tag())
            } else {
                None
            }
        }))
    }