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/nsh/src
    
    the code of the file until where you have to start completion: #![cfg_attr(test, feature(test))]

#[macro_use]
extern crate log;
#[macro_use]
extern crate lazy_static;
extern crate dirs;
extern crate glob;
extern crate nix;
extern crate structopt;
#[macro_use]
extern crate failure;
extern crate pest;
#[macro_use]
extern crate pest_derive;
extern crate backtrace;

#[cfg(test)]
#[macro_use]
extern crate pretty_assertions;
#[cfg(test)]
extern crate test;

#[macro_use]
mod macros;
mod bash_server;
mod builtins;
mod context_parser;
mod dircolor;
    
fn init_logger() {
    use fern::colors::{Color, ColoredLevelConfig};

    let log_colors = ColoredLevelConfig::new().info(Color::Green);
    let log_file = fern::log_file(dirs::home_dir().unwrap().join(".nsh.log"))
        .expect("failed to open ~/.nsh.log");
    fern::Dispatch::new()
        .format(move |out, message, record| {
            out.finish(format_args!(
                "\x1b[1m[{}\t]\x1b[0m \x1b[36m{}\x1b[0m: {}",
                log_colors.color(record.level()),
                record.file().unwrap_or_else(|| record.target()),
                message,
            ))
        })
        .chain(log_file)
        .apply()
        .expect("failed to initialize the logger");
}